Design method, device and application of nonlinear term offset moving-coil oscillator

Abstract

The design method of the nonlinear term offset moving-coil vibrator meets the following conditions: (1) a moving-coil vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly; and (2) the mover assembly is simultaneously subjected to the action of push force and pull force in pairs, so that linear terms in the acting force on the mover assembly are superposed and become larger, and non-linear terms in the acting force on the mover assembly are partially or completely counteracted and become smaller, and the moving-coil vibrator with the counteracted non-linear terms is obtained.

Description

Technical Field

[0001] This invention relates to the field of oscillator technology, specifically to a design method, apparatus, and application of a moving-coil oscillator with nonlinear term cancellation. Background Technology

[0002] The vibrator and / or haptic feedback actuator design of bone conduction headphones, particularly the dynamic coil design, offers several advantages. For example, dynamic coils are commonly used in conventional speakers, making the technology relatively mature. Furthermore, the low motion mass of the vibrator results in a faster response to signal changes and lower latency. Additionally, the low motion mass allows for a higher bandwidth.

[0003] Existing moving-coil oscillator and actuator designs often exhibit high nonlinearity due to inherent limitations in the magnet and coil combination design. This means the force or acceleration applied to the moving coil component results in significant distortion at low or high frequencies, known as total harmonic distortion (THD). Please refer to the appendix. Figure 26 The figure shows the distortion curve of a currently designed moving-coil oscillator. It can be seen that the distortion reaches 55% near 35Hz and 65% around 5kHz-6kHz. Such high distortion indicates that in the low-frequency range, the distortion of the audio signal or haptic feedback signal leads to a significant discrepancy between the perceived sound quality and the actual haptic feedback. Generally, a distortion greater than 10% is unacceptable according to audio standards. Summary of the Invention

[0004] One of the objectives of this invention is to provide a design method for a moving-coil oscillator that cancels out nonlinear terms.

[0005] Another object of the present invention is to provide a moving coil oscillator designed using the above method to cancel out nonlinear terms.

[0006] Another object of the present invention is to provide an application of a moving coil oscillator with nonlinear term cancellation designed by the above method.

[0007] The technical solution of this invention is: a design method for a moving-coil oscillator with nonlinear term cancellation, comprising the following conditions:

[0008] (1): A moving coil oscillator body is provided. The moving coil oscillator body includes an outer cylinder, a vibration transmission plate, a stator assembly and a moving part assembly. The stator assembly includes a magnet assembly structure and the moving part assembly includes a coil assembly structure. The stator assembly is fixed inside the outer cylinder and the vibration transmission plate is fixed on the outer cylinder. The moving part assembly and the vibration transmission plate are fixedly connected through at least one point. The moving part assembly is called a moving component.

[0009] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0010] This invention provides an improved design method, apparatus, and application for a moving-coil oscillator that cancels out nonlinear terms. Compared with the prior art, it has the following improvements and advantages:

[0011] 1. This invention proposes a method to reduce the nonlinear term of the driving force on the moving coil assembly or the nonlinear term of the oscillator coil current in the acceleration of the moving coil assembly by means of a symmetrical or asymmetrical design, so that the nonlinear term can be completely or partially canceled out in the final resultant force, thereby greatly reducing the distortion of the oscillator and improving the fidelity of the oscillator for the original audio signal or tactile feedback signal.

[0012] 2. The nonlinear term cancellation moving coil oscillator of the present invention reduces the total harmonic distortion (THD) in the low-frequency range from the original peak value of 55% to below 15% and the THD in the high-frequency range from the original peak value of 65% to below 5%. The reduction in the distortion curve is equivalent to a reduction in the resonant frequency of the oscillator system, thereby improving the sound quality in the low and mid-frequency ranges. In addition, it can also be equivalent to an increase in the sensitivity of the oscillator system and a reduction in power consumption.

[0013] 3. The moving coil oscillator design method of the present invention results in a oscillator with uniform and balanced force, realizing the oscillator to generate overall translational vibration, and achieving the best vibration effect. Attached Figure Description

[0014] The present invention will be further explained below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 These are cross-sectional views of embodiments 1 and 2 of the present invention;

[0016] Figure 2 These are the closed magnetic field lines of the coil and permanent magnet in Embodiments 1 and 2 of the present invention;

[0017] Figure 3 These are magnetic domain analysis diagrams of embodiments 1 and 2 of the present invention;

[0018] Figure 4 This is a diagram showing the relationship between the magnetic field and the stator assembly in embodiments 1 and 2 of the present invention;

[0019] Figure 5 These are force analysis diagrams of the moving part components in Embodiments 1 and 2 of the present invention;

[0020] Figure 6 These are cross-sectional views of embodiments 3 and 4 of the present invention;

[0021] Figure 7 These are the closed magnetic field lines of the coil and permanent magnet in embodiments 3 and 4 of the present invention;

[0022] Figure 8 These are magnetic domain analysis diagrams from embodiments 3 and 4 of the present invention;

[0023] Figure 9 This is a diagram showing the relationship between the magnetic field and the stator assembly in embodiments 3 and 4 of the present invention;

[0024] Figure 10 These are force analysis diagrams of the moving part components in embodiments 3 and 4 of the present invention;

[0025] Figure 11 These are cross-sectional views of embodiments 5 and 6 of the present invention;

[0026] Figure 12 These are the closed magnetic field lines of the coil and permanent magnet in embodiments 5 and 6 of the present invention;

[0027] Figure 13 These are magnetic domain analysis diagrams from embodiments 5 and 6 of the present invention;

[0028] Figure 14 These are diagrams showing the relationship between the magnetic field and the stator assembly in embodiments 5 and 6 of the present invention;

[0029] Figure 15 These are force analysis diagrams of the moving part components in embodiments 5 and 6 of the present invention;

[0030] Figure 16 These are cross-sectional views of embodiments 7 and 8 of the present invention;

[0031] Figure 17 These are the closed magnetic field lines of the coil and permanent magnet in embodiments 7 and 8 of the present invention;

[0032] Figure 18 These are magnetic domain analysis diagrams from embodiments 7 and 8 of the present invention;

[0033] Figure 19 This is a diagram showing the relationship between the magnetic field and the stator assembly in embodiments 7 and 8 of the present invention;

[0034] Figure 20 These are force analysis diagrams of the moving part assembly in embodiments 7 and 8 of the present invention;

[0035] Figure 21 These are cross-sectional views of embodiments 9 and 10 of the present invention;

[0036] Figure 22 These are the closed magnetic field lines of the coil and permanent magnet in embodiments 9 and 10 of the present invention;

[0037] Figure 23 These are magnetic domain analysis diagrams from embodiments 9 and 10 of the present invention;

[0038] Figure 24This is a diagram showing the relationship between the magnetic field and the stator assembly in embodiments 9 and 10 of the present invention;

[0039] Figure 25 These are force analysis diagrams of the moving part components in embodiments 9 and 10 of the present invention;

[0040] Figure 26 This is a test chart of total harmonic distortion (THD) for existing moving-coil oscillators using current technology.

[0041] Figure 27 This is a total harmonic distortion (THD) test chart of the moving coil oscillator with nonlinear term cancellation in Example 1.

[0042] Figures 28-44a This is a schematic diagram of the magnet component in this invention;

[0043] Figures 45-57 This is a schematic diagram of the coil component in this invention;

[0044] Figures 58-63 This is a schematic diagram of the magnetic field in this invention. Detailed Implementation

[0045] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] For the design of nonlinear term cancellation, there are 2N magnetic domains inside the oscillator. The magnetic domains are paired and defined as magnetic domain D. 1,i and D 2,i Where i = 1, 2, 3, ..., N. The closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively pass through the magnetic field domain D. 1,i and D 2,i And in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to that of the permanent magnet. Or in the magnetic domain D... 1,i In the coil, the direction of the magnetic field lines is opposite to that of the permanent magnet, while in the magnetic domain D... 2,i In this case, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0047] When the magnetic field lines of a coil passing through a magnetic field are in the same direction as the magnetic field lines of a permanent magnet, the total magnetic flux is equal to the sum of the magnetic flux produced by the coil and the magnetic flux produced by the permanent magnet. When the magnetic field lines of a coil passing through a magnetic field are in the same direction as the magnetic field lines of a permanent magnet, the total magnetic flux is equal to the difference between the magnetic flux produced by the coil and the magnetic flux produced by the permanent magnet.

[0048] Magnetic domain: A magnetic domain is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; the moving coil oscillator of this invention, which cancels out nonlinear terms, includes at least one magnetic domain. A magnetic domain refers to a spatial region where a certain electromagnetic field or multiple electromagnetic fields exist, causing interaction forces between the components surrounding the magnetic domain. We define such a region as a magnetic domain, or simply a magnetic domain. A magnetic domain is the spatial region where magnetic interaction occurs. It is generally composed of the spatial region between permanent magnets (producing attractive or repulsive interactions), or the spatial region enclosed by permanent magnets and magnetic conductors (producing attractive interactions), or the spatial region enclosed by magnetic conductors (yokes) magnetized by permanent magnets, or a group of spatial regions where magnetic interaction occurs within permanent magnets (the permeability of the hard magnetic material constituting the permanent magnet is close to that of air).

[0049] Several types of magnetic domains:

[0050] 1) The space between the permanent magnets is filled with a medium (air, with a relative permeability slightly greater than 1).

[0051] The medium above can be replaced with a paramagnetic material, an antimagnetic material, or a ferromagnetic material with a relative permeability of less than 1000. For example:

[0052] a. Paramagnetic materials: These have a relative permeability slightly greater than 1. Examples of paramagnetic materials include air, oxygen, tin, aluminum, and lead. When a paramagnetic material is placed in a magnetic field, the magnetic induction intensity B increases slightly.

[0053] b. Diamagnetic materials: These are materials with a relative permeability slightly less than 1, such as hydrogen, copper, graphite, silver, and zinc. They are also called diamagnetic materials. When a diamagnetic material is placed in a magnetic field, the magnetic induction intensity B decreases slightly.

[0054] c. Ferromagnetic materials: These have a relative permeability much greater than 1 but less than 1000. Examples include iron, steel, cast iron, nickel, and cobalt. Materials with a relative permeability less than 1000 include cobalt, unannealed cast iron, and annealed cast iron. Magnetic fluids, on the other hand, have a relative permeability below 10.

[0055] like Figure 58As shown, permanent magnet 1 and permanent magnet 2 are surrounded by air. The permanent magnets attract each other.

[0056] Magnetic domain D1: The spatial region enclosed by the air medium between permanent magnet 1 and permanent magnet 2.

[0057] Magnetic domain D2: The spatial region enclosed by the partial permanent magnet 2 and the air medium surrounding the partial permanent magnet 2.

[0058] Magnetic domain D3: The spatial region enclosed by all permanent magnets 1 and the air medium surrounding permanent magnets 1.

[0059] Magnetic domain D4: The spatial region enclosed by all permanent magnets 1 and 2, and the air medium surrounding permanent magnets 1 and 2.

[0060] Magnetic domain D5: The spatial region enclosed by air medium on the side of permanent magnet 2 away from permanent magnet 1.

[0061] Magnetic domain D6: The spatial region enclosed by the permanent magnet material medium surrounding part of the permanent magnet 1.

[0062] like Figure 59 As shown, permanent magnet 1 and permanent magnet 2 are surrounded by air. The permanent magnets attract each other. Similarly, D1-D6 can be defined.

[0063] 2) The space between the permanent magnet and the magnetic conductor is filled with a medium (air, with a relative permeability close to 1).

[0064] 3) such as Figures 60-61 As shown, the space between the magnetic conductors is filled with a medium (air, with a relative permeability close to 1).

[0065] Magnetic domain D1: The spatial region enclosed by the air medium between magnetic conductor 1 and magnetic conductor 2.

[0066] Magnetic domain D2: The spatial region enclosed by a portion of permanent magnets and a portion of magnetic conductors 2, as well as the surrounding air medium.

[0067] Magnetic domain D3: The spatial region enclosed by all the magnetic conductors 1, some permanent magnets, and the air medium surrounding the magnetic conductors 1.

[0068] Magnetic domain D4: The spatial region enclosed by all magnetic conductors 1 and 2, permanent magnets, and the air medium surrounding them.

[0069] Magnetic domain D5: The spatial region enclosed by the air medium on the side of conductor 2 away from magnetic conductor 1.

[0070] Magnetic domain D6: The spatial region enclosed by a permanent magnetic material medium surrounding a portion of the permanent magnet.

[0071] 4) such as Figure 62 As shown, the space between the magnet and the magnetic conductor is filled with a medium (magnetorheological fluid, with a relative permeability between 5 and 9).

[0072] 5) The internal space of the permanent magnet is filled with a medium (permanent magnet material, relative permeability <1000).

[0073] like Figure 63 As shown in the previous example, magnetic domain D6 has a permanent magnet material as its medium, such as sintered ferrite, samarium cobalt and neodymium iron boron with a permeability of about 1.05, bonded ferrite also has a permeability of about 1.05, and bonded neodymium magnets have a permeability range of about 1.1 to 1.7.

[0074] There are two types of magnetic force domains. The first type is the magnetic force domain enclosed within the mover assembly or the stator assembly. The second type is the magnetic force domain enclosed between the mover assembly and the stator assembly. We are more interested in the second type of magnetic force domain. Therefore, by analyzing the second type of magnetic force domain, we can obtain the force analysis of the mover assembly, thereby obtaining the resultant force of the mover assembly in the oscillator system, and further derive its vibration equation.

[0075] Example 1

[0076] Please refer to Figure 1-5 The design method for a moving-coil oscillator with canceled nonlinear terms includes the following conditions:

[0077] (1): A moving coil oscillator body 11 is provided. The moving coil oscillator body 11 includes an outer cylinder 1, a vibration transmission plate 9, a stator assembly, and a moving part assembly. The moving part assembly includes a magnet combination structure, and the moving part assembly includes a coil combination structure. The magnet combination structure includes a permanent magnet 6 and a first magnetic conductor or a first non-magnetic conductor 8. The coil combination structure includes a coil 3 and a second magnetic conductor or a second non-magnetic conductor 4. The stator assembly is fixed inside the outer cylinder 1, and the vibration transmission plate 9 is fixed on the outer cylinder 1. The moving part assembly and the vibration transmission plate 9 are fixedly connected through at least one point. The moving part assembly moves while the stator assembly does not move. The moving part assembly is called the moving component. When the first magnetic conductor 8 is used in the magnet combination structure, the magnetic resistance is small and the vibration effect is better. When the first non-magnetic conductor 8 is used, the magnetic resistance is large and the vibration effect is weaker, but it can still be applied to some scenarios. Similarly, when the coil assembly structure uses the second magnetic conductor, the magnetic resistance is small and the vibration effect is better. However, when the second non-magnetic conductor 4 is used, the magnetic resistance is large and the vibration effect is weaker, but it can still be applied to some scenarios.

[0078] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0079] (3): The moving coil oscillator body 11 has 2N magnetic domains D designed in pairs inside. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...;

[0080] The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

[0081] In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

[0082] In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D... 1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0083] The vibration transmission plate 9 can be rectangular, circular, racetrack-shaped or three-dimensional depending on the application scenario, and can be used in combination according to different application scenarios; the vibration transmission plate 9 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0084] The stator assembly is fixed inside the outer cylinder 1, which can be on the inner wall, top surface, or bottom surface of the outer cylinder 1;

[0085] The moving part assembly is fixedly connected to the vibration transmission plate 9 through at least one point, which includes point contact and surface contact, and can be one point, two points, or multiple points.

[0086] The number of permanent magnets 6 and coils 3 is limited, with 1 permanent magnet and 2 coils.

[0087] The moving coil oscillator body 11 has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 6 respectively traverse the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 3 is opposite to that of the permanent magnet 6, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil 3 is the same as the direction of the magnetic field lines of the permanent magnet 6;

[0088] The moving component is subjected to two forces; each force comprises two parts, one being a linear term of the excitation current i and the other being a nonlinear term of the excitation current i:

[0089] F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N;

[0090] The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i.

[0091] F 动圈,合力 (i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i)

[0092] in:

[0093]

[0094]

[0095]

[0096] That is, the nonlinear terms in each component force either partially or completely cancel each other out, resulting in the final total resultant force ∑. i (F 1,i +F 2,i In this process, the total resultant force partially or completely cancels out the nonlinear term of the current, while the linear terms are superimposed and increase, thus obtaining a moving coil oscillator with the nonlinear term canceled out.

[0097] The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 6 alternately pass through the moving part assembly and the stator assembly, respectively.

[0098] It also includes the following conditions:

[0099] (3.1): Looking outward from the center, the permanent magnet 6 is inside and the coil 3 is outside;

[0100] (3.2):N 圈 =2; n=1;

[0101] (3.3): When N 圈 When the value is greater than 1, the current in adjacent coil 3 is in the opposite direction, and the electromagnetic fields of two adjacent coils 3 and their two adjacent end faces have the same polarity.

[0102] A magnetic conductor is used near the outer cylinder 1 of the coil 3 to minimize the magnetic resistance of the magnetic circuit of the electromagnet 6 formed by the coil 3; the permanent magnets 6 in the magnet assembly are isolated by a magnetic conductor; a yoke is used around the coil 3 and the permanent magnets 6, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder 1 near the coil 3.

[0103] Example 2

[0104] Please refer to Figure 1-5The nonlinear term cancellation moving-coil oscillator device designed using the method of Embodiment 1 includes a moving-coil oscillator body 11. The moving-coil oscillator body 11 includes an outer cylinder 1, a transmission plate 9, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 6 and a first magnetic conductor or a first non-magnetic conductor 8. The coil assembly structure includes a coil 3 and a second magnetic conductor or a second non-magnetic conductor 4. The magnet assembly structure also includes a magnetic disk 7 and a magnetic ring 2. Viewed from the center outwards, the coil 3 is on the outside, and the permanent magnet 6 is on the inside. There is one permanent magnet 6 and two coils 3. The current directions in adjacent coils 3 are opposite. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 3 are the same. The first magnetic conductor or the first non-magnetic conductor 8 is fixed to the bottom surface of the outer cylinder 1, and the permanent magnet 6 is fixed to the first magnetic conductor or the first non-magnetic conductor 8. On the non-magnetic body 8, the magnetic disk 7 is fixedly mounted on one side of the permanent magnet 6. A vibration transmission plate 9 is provided, and the vibration transmission plate 9 is fixed to the top surface of the outer cylinder 1. The vibration transmission plate 9 is fixedly connected to a vibration transmission bracket 10, which is L-shaped. The horizontal part of the vibration transmission bracket 10 is parallel to the vibration direction. The second magnetic or non-magnetic body 4 is fixed in the middle of the horizontal part of the vibration transmission bracket 10. Two coils 3 are respectively fixed on both sides of the second magnetic or non-magnetic body 4. A magnetic ring 2 is fixed to the outside of the two coils 3. Both coils 3 and the magnetic ring 2 are fixed on the horizontal part of the vibration transmission bracket 10. The moving coil assembly and the stator assembly are arranged in a staggered, interlocking shape. The closed curves of the main magnetic lines of the coils 3 and the main magnetic lines of the permanent magnet 6 alternately pass through the moving coil assembly and the stator assembly. The moving coil oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 6 respectively cross the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 3 is opposite to that of the permanent magnet 6, while in the magnetic field domain D... 2,1 In this configuration, the magnetic field lines of the coil 3 are in the same direction as the magnetic field lines of the permanent magnet 6.

[0105] The outer cylinder 1 can be a magnetic outer cylinder or a non-magnetic outer cylinder. In order to reduce magnetic resistance, a magnetic outer cylinder is preferred. The cross-section of the outer cylinder can be circular, square, or irregular, and can be continuous or discontinuous, such as columnar connection or grid discontinuity.

[0106] To further illustrate the design method of a moving-coil oscillator with nonlinear term cancellation, please refer to the appendix. Figure 2 Air gap 1 constitutes the magnetic field D 1,1 The air gap 2 constitutes the magnetic field D. 1,1 Within the magnetic field domain, the total magnetic flux / magnetic induction intensity generated by the superposition of the magnetic field generated by the permanent magnet 6 and the electromagnet generated by the coil 3 causes the components around the magnetic field to generate interaction forces.

[0107] Please refer to the appendix. Figure 3 Draw the closed magnetic field lines of coils C1 and C2, and the permanent magnet. In the diagram, the closed magnetic field lines generated by coil C1 pass through magnetic gap D1, the closed magnetic field lines generated by coil C2 pass through magnetic gap D2, and the closed magnetic field lines generated by the permanent magnet pass through magnetic gaps D1 and D2 in sequence. The current through coil C1 and the current through coil C2 are both i, but the current directions in coil C1 and C2 are opposite. Assume the magnetic flux corresponding to coil C1 is Φ. i1 The magnetic flux corresponding to coil C2 is Φ i2 The magnetic flux corresponding to the permanent magnet is Φ m In the magnetic domain D1 (magnetic field domain D1), the direction of the magnetic field lines corresponding to coil C1 is the same as the direction of the magnetic field lines corresponding to the permanent magnet. Therefore, in the magnetic domain D... 1,1 In the middle, the total magnetic flux is Φ i1 and Φ m The added value. In the magnetic domain D 2,1 (Magnetic field of action D) 2,1 In the magnetic field, the direction of the magnetic field lines corresponding to coil C2 is opposite to the direction of the magnetic field lines corresponding to the permanent magnet. Therefore, in the magnetic field domain D... 2,1 In the middle, the total magnetic flux is Φ i2 and Φ m The decrease. Assuming that the direction of the magnetic field lines of the permanent magnet is positive in each magnetic domain, then:

[0108] Φ D1 =Φ m +Φ i1

[0109] Φ D2 =Φ m -Φ i2

[0110] Assume that the magnetic reluctance of the magnetic circuit formed by the electromagnetic fields generated by the currents in coils 1 and 2 are respectively Z i1 and Z i2 Where N is the number of turns in the coil and i is the current intensity, then:

[0111]

[0112]

[0113] Because the magnetic circuit structure of coils C1 and C2 is a symmetrical design, therefore Z i1 =Z i2 =Z i Therefore, Furthermore, assuming the permeability of the magnetic circuit formed by the electromagnetic field generated by the current is G. i Then we have:

[0114]

[0115] The magnetic flux of a permanent magnet can also be expressed using the formula for magnetic induction intensity. Let's assume the magnetic induction intensity at the extreme ends of the permanent magnet is B. m The area of ​​the magnetic pole end is S. m , can be obtained

[0116] Therefore,

[0117]

[0118] Please refer to the appendix. Figure 2-4 It is a moving component, magnetic domain D 1,1 D 2,1 Relationship diagram with stator assembly. In magnetic domain D 1,1 The moving part is subjected to a leftward attractive force F1 from the stator assembly in the magnetic domain D. 2,1 The moving part is subjected to a rightward suction force F2 from the stator assembly. Taking the rightward direction as positive, the resultant force of the moving part on the stator assembly is -F1+F2.

[0119] Referring to the force analysis diagram isolated from the moving part, the moving part is subjected to forces from the stator part, namely a suction force F1 to the left and a suction force F2 to the right, and the resultant force is -F1+F2.

[0120] F 动圈 =-F1+F2

[0121] Further derive the formulas for the electromagnetic forces generated in each magnetic domain. The electromagnetic attraction acting on a magnetized ferromagnetic object is proportional to the total area of ​​the magnetic field lines passing through the magnetic poles and the square of the magnetic flux density. If the magnetic flux density B is uniformly distributed along the surface of the magnetic poles, and the calculated air gap length is small, then the formula for calculating the electromagnetic attraction is Maxwell's formula.

[0122] The expression is:

[0123]

[0124] F: Electromagnetic attraction

[0125] B: Magnetic flux density or magnetic induction intensity

[0126] Magnetic flux through a medium

[0127] S: Area of ​​magnetic field lines crossing magnetic poles

[0128] μ0: Air permeability

[0129] C: The correlation coefficient between the combination type and shape of the magnetic end faces, which has different values ​​for different scenarios. If it is the force generated between permanent magnets, then C... m2m The value is usually taken as 1, and the accurate value is obtained through actual measurement during the design process; if the force between the permanent magnet and the conductive magnet (yoke) is..., then C... m2y The value is usually taken as 1 / 2, and the accurate value is obtained through actual measurement during the design process; if it is the force between the magnetic conductor (yoke) and the magnetic conductor (yoke), it is denoted as C. y2y It is usually taken as 1 / 4, and the accurate value is obtained through actual measurement during the design process.

[0130] Applying the above formula to calculate the electromagnetic attraction in magnetic domain 1 and magnetic domain 2, we get:

[0131]

[0132] Among them, S D1 S D2 These are the areas of the annular end faces corresponding to magnetic domains 1 and 2, respectively, and S D1 =S D1 =S D Therefore:

[0133]

[0134]

[0135] Among them are:

[0136]

[0137]

[0138] because

[0139] F 动圈 =-F1+F2

[0140] Then there is

[0141] F 动圈，linear =F 动圈，linear +F 动圈，nonlinear

[0142]

[0143] F 1，linear F 2，linear F 1，nonlinear F 1，nonlinear Substitute F respectively 动圈，linear and F 动圈，nonlinear The calculations are as follows:

[0144]

[0145] because

[0146]

[0147]

[0148] Therefore:

[0149]

[0150] Similarly, calculate F. 动圈，nonlinear ,

[0151]

[0152]

[0153] Therefore, the net force on the moving coil, which acts as the moving part, is:

[0154]

[0155] From the above derivation process, the following characteristics can be observed:

[0156] 1) In the linear term of the resultant force F 动圈，,linear In the middle, the component force F 1，linear and F 2,linear The linear terms of each individual are superimposed to form the resultant linear term F. 动圈，,linear The coefficient of the coil current is larger.

[0157] 2) In the resultant nonlinear term F 动圈，nonlinear In the middle, the component force F 1，nonlinear and F 2，nonlinear Their respective nonlinear terms cancel each other out, thus the resultant nonlinear term F 动圈，,nonlinear It is zero.

[0158] We call the above design method the design method for moving-coil oscillators with nonlinear term cancellation. This method can be used not only for designing oscillators but also for designing brakes. The moving-coil oscillators or brakes obtained using the above method are also called moving-coil oscillator devices or brakes with nonlinear term cancellation.

[0159] Please refer to the appendix. Figure 27 The figure shows the THD distortion curve of the moving-coil oscillator with nonlinear term cancellation designed according to the present invention. As can be seen from the figure, the moving-coil oscillator with nonlinear term cancellation of the present invention reduces the total harmonic distortion (THD) in the low-frequency range from the original peak value of 55% to below 15% of the peak value, and the total harmonic distortion in the high-frequency range from the original peak value of 65% to below 5%. This reduction in distortion curves can be equivalently translated into a reduction in the resonant frequency of the oscillator system, resulting in better low-to-mid-frequency sound quality. Furthermore, it can also be equivalently translated into an increase in the sensitivity of the oscillator system and a reduction in power consumption.

[0160] Example 3

[0161] Please refer to Figure 6-10 The design method for a moving-coil oscillator with canceled nonlinear terms includes the following conditions:

[0162] (1): A moving coil oscillator body 11 is provided. The moving coil oscillator body 11 includes an outer cylinder 1, a transmission plate 8, a stator assembly and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 5 and a first magnetic conductor or a first non-magnetic conductor 7. The coil assembly structure includes a coil 3 and a second magnetic conductor or a second non-magnetic conductor 2. The stator assembly is fixed inside the outer cylinder 1, and the transmission plate 8 is fixed on the outer cylinder 1. The mover assembly and the transmission plate 8 are fixedly connected through at least one point. The mover assembly moves while the stator assembly does not move. The mover assembly is called a moving component.

[0163] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0164] (3): The moving coil oscillator body 11 has 2N magnetic domains D designed in pairs inside. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...;

[0165] The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

[0166] In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

[0167] In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D... 1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0168] The vibration transmission plate 8 can be rectangular, circular, racetrack-shaped or three-dimensional depending on the application scenario, and can be used in combination according to different application scenarios; the vibration transmission plate 8 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0169] The stator assembly is fixed inside the outer cylinder 1, which can be on the inner wall, top surface, or bottom surface of the outer cylinder 1;

[0170] The moving part assembly is fixedly connected to the vibration transmission plate 8 through at least one point, which includes point contact and surface contact, and can be one point, two points, or multiple points.

[0171] The number of permanent magnets 5 and coils 3 is limited, with 2 permanent magnets 5 and 1 coil.

[0172] The moving coil oscillator body 11 has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 5 respectively cross the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 3 is the same as that of the permanent magnet 5, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil 3 is opposite to the direction of the magnetic field lines of the permanent magnet 6.

[0173] The moving component is subjected to two forces; each force comprises two parts, one being a linear term of the excitation current i and the other being a nonlinear term of the excitation current i:

[0174] F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N;

[0175] The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i.

[0176] F 动圈,合力 (i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i)

[0177] in:

[0178]

[0179]

[0180]

[0181] That is, the nonlinear terms in each component force either partially or completely cancel each other out, resulting in the final total resultant force ∑. i (F 1,i +F 2,i In this process, the total resultant force partially or completely cancels out the nonlinear term of the current, while the linear terms are superimposed and increase, thus obtaining a moving coil oscillator with the nonlinear term canceled out.

[0182] The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 5 alternately pass through the moving part assembly and the stator assembly, respectively.

[0183] It also includes the following conditions:

[0184] (3.1): Looking outward from the center, the permanent magnet 5 is inside and the coil 3 is outside;

[0185] (3.2):N 磁 =2; n=1;

[0186] (3.3): When N 磁 When the value is greater than 1, the polarities of the two opposite end faces of the adjacent permanent magnet are the same.

[0187] A magnetic conductor is used near the outer cylinder 1 of the coil 3 to minimize the magnetic resistance of the magnetic circuit of the electromagnet 5 formed by the coil 3; the permanent magnets 5 in the magnet assembly are isolated by a magnetic conductor; a yoke is used around the coil 3 and the permanent magnets 5, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder 1 near the coil 3.

[0188] Example 4

[0189] Please refer to Figure 6-10 The nonlinear term cancellation moving-coil oscillator device designed using the method of Embodiment 3 includes a moving-coil oscillator body 11. The moving-coil oscillator body 11 includes an outer cylinder 1, a transmission plate 8, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 5 and a first magnetically conductive body or a first non-magnetically conductive body 7. The coil assembly structure includes a coil 3 and a second magnetically conductive body or a second non-magnetically conductive body 2. The magnet assembly structure also includes a magnetically conductive coil 6 and an I-beam yoke 4. Viewed from the center outward, the coil 3 is on the outside, and the permanent magnet 5 is on the inside. There are two permanent magnets 5, and the polarities of the two opposite end faces of adjacent permanent magnets 5 are the same. There is one coil 3. The first magnetically conductive body or the first non-magnetically conductive body 7 is fixed to the bottom surface of the outer cylinder 1. An I-beam yoke 4 is fixed between the two permanent magnets 5. 5 is fixed on the first magnetic conductor or the first non-magnetic conductor 7. The magnetic conductor ring 6 is fixed on the outer side of another permanent magnet 5. There is one vibration transmission plate 8, which is fixed on the top surface of the outer cylinder 1. The vibration transmission plate 8 is fixedly connected to the vibration transmission bracket 9. The vibration transmission bracket 9 is L-shaped. The horizontal part of the vibration transmission bracket 9 is parallel to the vibration direction. The coil 3 is fixed in the middle of the horizontal part of the vibration transmission bracket 9. The second magnetic conductor or the second non-magnetic conductor 2 is fixed on the outer side of the coil 3. The second magnetic conductor or the second non-magnetic conductor 2 is fixed on the horizontal part of the vibration transmission bracket 9. The moving part assembly and the stator assembly are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic field line of the coil 3 and the closed curve of the main magnetic field line of the permanent magnet 5 alternately pass through the moving part assembly and the stator assembly. The moving part oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 5 respectively cross the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 3 is the same as that of the permanent magnet 5, while in the magnetic domain D... 2,1 In this case, the magnetic field lines of the coil 3 are opposite to the magnetic field lines of the permanent magnet 5; in order to reduce magnetic resistance, the outer cylinder 1 is preferably a magnetically conductive outer cylinder.

[0190] Example 5

[0191] Please refer to Figure 11-15 The design method for a moving-coil oscillator with canceled nonlinear terms includes the following conditions:

[0192] (1): A moving coil oscillator body 11 is provided. The moving coil oscillator body 11 includes an outer cylinder 1, a vibration transmission plate 8, a stator assembly and a moving part assembly. The stator assembly includes a magnet assembly structure. The moving part assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 6 and a first magnetic conductor or a first non-magnetic conductor 2. The coil assembly structure includes a coil 3 and a second magnetic conductor or a second non-magnetic conductor 7. The stator assembly is fixed inside the outer cylinder 1. The vibration transmission plate 8 is fixed on the outer cylinder 1. The moving part assembly and the vibration transmission plate 8 are fixedly connected through at least one point. The moving part assembly moves while the stator assembly does not move. The moving part assembly is called the moving component.

[0193] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0194] (3): The moving coil oscillator body 11 has 2N magnetic domains D arranged in pairs inside. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...

[0195] The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

[0196] In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

[0197] In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D... 1,iIn the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0198] The vibration transmission plate 8 can be rectangular, circular, racetrack-shaped or three-dimensional depending on the application scenario, and can be used in combination according to different application scenarios; the vibration transmission plate 8 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0199] The stator assembly is fixed inside the outer cylinder 1, which can be on the inner wall, top surface, or bottom surface of the outer cylinder 1;

[0200] The moving part assembly is fixedly connected to the vibration transmission plate 8 through at least one point, which includes point contact and surface contact, and can be one point, two points, or multiple points.

[0201] The number of permanent magnets 6 and coils 3 is limited, with 2 permanent magnets 6 and 1 coil.

[0202] The moving coil oscillator body 11 has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 6 respectively traverse the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 3 is opposite to that of the permanent magnet 6, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil 3 is the same as the direction of the magnetic field lines of the permanent magnet 6;

[0203] The moving component is subjected to two forces; each force comprises two parts, one being a linear term of the excitation current i and the other being a nonlinear term of the excitation current i:

[0204] F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N;

[0205] The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i.

[0206] F 动圈,合力(i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i)

[0207] in:

[0208]

[0209]

[0210]

[0211] That is, the nonlinear terms in each component force either partially or completely cancel each other out, resulting in the final total resultant force ∑. i (F 1,i +F 2,i In this process, the total resultant force partially or completely cancels out the nonlinear term of the current, while the linear terms are superimposed and increase, thus obtaining a moving coil oscillator with the nonlinear term canceled out.

[0212] The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curves of the main magnetic field lines of the coil 3 and the closed curves of the main magnetic field lines of the permanent magnet 6 alternately pass through the moving part assembly and the stator assembly, respectively.

[0213] It also includes the following conditions:

[0214] (3.1): Looking outward from the center, the permanent magnet 5 is inside and the coil 3 is outside;

[0215] (3.2):N 磁 =2; n=1;

[0216] (3.3): When N 磁 When the value is greater than 1, the polarities of the two opposite end faces of the adjacent permanent magnet are the same.

[0217] A magnetic conductor is used near the outer cylinder 1 of the coil 3 to minimize the magnetic resistance of the magnetic circuit of the electromagnet 6 formed by the coil 3; the permanent magnets 6 in the magnet assembly are isolated by a magnetic conductor; a yoke is used around the coil 3 and the permanent magnets 6, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder 1 near the coil 3.

[0218] Example 6

[0219] Please refer to Figure 11-15The nonlinear term cancellation moving-coil oscillator device designed using the method of Embodiment 5 includes a moving-coil oscillator body 11. The moving-coil oscillator body 11 includes an outer cylinder 1, vibration transmission plates 8, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 6 and a first magnetic conductor or a first non-magnetic conductor 4. The coil assembly structure includes a coil 3 and a second magnetic conductor or a second non-magnetic conductor 7. The magnet assembly structure also includes a first magnetic ring 2, and the coil assembly structure also includes a second magnetic ring 5. Viewed from the center outward, the coil 3 is inside, and the permanent magnet 6 is outside. There is one coil 3 and two permanent magnets 6. The polarities of the two opposite end faces of the permanent magnets 6 are the same. There are two vibration transmission plates 8, which are respectively fixed to the top surface of the outer cylinder 1 and the outer cylinder 1. On the bottom surface, the two ends of the first magnetically conductive body or the first non-magnetically conductive body 4 are respectively fixed on the vibration plate 8. The coil 3 is fixed around the first magnetically conductive body or the first non-magnetically conductive body 4. The first magnetically conductive body or the first non-magnetically conductive body 4 is also provided with a second magnetically conductive ring 5. The first magnetically conductive body or the first non-magnetically conductive body 4 is fixed on the inner wall of the outer cylinder 1. Two permanent magnets 6 are fixed on the outside of the first magnetically conductive body or the first non-magnetically conductive body 4. The first magnetically conductive ring 2 is provided on the outside of each permanent magnet 6. The permanent magnet 6 is fixed on the inner wall of the outer cylinder 1. The moving part assembly and the stator assembly are arranged in an interlocking, concave-convex shape. The closed curve of the main magnetic field line of the coil 3 and the closed curve of the main magnetic field line of the permanent magnet 6 alternately pass through the moving part assembly and the stator assembly. The moving coil oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,1 D 2,1 In the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0220] To further illustrate the design method of a moving-coil oscillator with nonlinear term cancellation, please refer to the appendix. Figure 9-13 In the diagram above, the air gap D1 constitutes the magnetic field domain D. 1,1 The air gap D2 constitutes the magnetic field domain D. 2,1 , forming magnetic field pairs D = (D 1,1 D 2,1 Within the magnetic field domain, the total magnetic flux / magnetic induction intensity generated by the superposition of the magnetic field generated by the permanent magnet and the magnetic field generated by the coil electromagnet causes the components around the magnetic field to generate interaction forces.

[0221] Consider the magnetic field pair D = (D 1,1 D 2,1 Assume the current through the coil is i, and the corresponding magnetic flux through the coil is Φ. i The magnetic flux corresponding to the permanent magnet M1 is Φ. m1， The magnetic flux corresponding to permanent magnet M2 is Φ m2 In the magnetic domain D 1,1 In the magnetic field domain D1, the direction of the magnetic field lines corresponding to coil C is opposite to the direction of the magnetic field lines corresponding to permanent magnet M1. Therefore, in the magnetic field domain D... 1,1 In the middle, the total magnetic flux is Φ i and Φ m1 The difference. In the magnetic domain D 2,1 (Magnetic field of action D) 2,1 In the magnetic field, the direction of the magnetic field lines corresponding to the coil is opposite to the direction of the magnetic field lines corresponding to the permanent magnet M2. Therefore, in the magnetic domain D... 2,1 In the middle, the total magnetic flux is Φ i and Φ m2 The added value. Since the magnetic field formed by a permanent magnet is static, assuming the direction of the magnetic field lines of the permanent magnet is positive and the magnetic flux is also positive, then:

[0222] Φ D1 =Φ m1 -Φ i

[0223] Φ D2 =Φ m2 +Φ i

[0224] Assume the magnetic reluctance of the magnetic circuit formed by the electromagnetic field generated by the current i in the coil above is Z. i Where N is the number of turns in the coil and i is the current intensity, then:

[0225]

[0226] Assume the permeability of the magnetic circuit formed by the electromagnetic field generated by the current is G. i Then we have:

[0227]

[0228] The magnetic flux corresponding to a permanent magnet can also be expressed using the formula for magnetic induction intensity. Assume the magnetic induction intensities at the magnetic end faces of permanent magnets M1 and M2 are B, respectively. m1 and B m2 And B rn1 =B m2 =B m Furthermore, assume that the areas of the magnetic end faces of permanent magnet 1 and permanent magnet 2 are S, respectively. m1 and Sm2 And S m1 =S m2 =S m It can be obtained that...

[0229] Therefore,

[0230]

[0231] Please refer to Figure 10 Draw the closed magnetic field lines of the coil and permanent magnets M1 and M2 separately. In the figure, the closed magnetic field lines generated by magnet M1 pass through the magnetic domain D. 1，1 The closed magnetic field lines generated by magnet M2 pass through the magnetic field D. 2,1 The closed magnetic field lines generated by the coil pass through the magnetic domain D in sequence. 1，1 and magnetic field D 2,1 .

[0232] Figure 12 It is a moving component, magnetic domain D 1，1 D 2,1 Relationship diagram with stator assembly. In magnetic domain D 1，1 The moving part experiences a rightward attractive force F1 from the stator assembly, and a leftward attractive force F2 from the stator assembly within the magnetic domain D2. Taking the rightward direction as positive, the net force exerted by the stator assembly on the moving part is F1 - F2.

[0233] Figure 13 This is a force analysis diagram isolated from the moving part. The moving part is subjected to forces from the stator part, namely a rightward suction force F1 and a leftward suction force F2, the resultant force of which is F1-F2.

[0234] F 动圈 =F1-F2

[0235] Further derive the formulas for the electromagnetic forces generated in each magnetic domain. The electromagnetic attraction acting on a magnetized ferromagnetic object is proportional to the total area of ​​the magnetic field lines passing through the magnetic poles and the square of the magnetic flux density. If the magnetic flux density B is uniformly distributed along the surface of the magnetic poles, and the calculated air gap length is small, then the formula for calculating the electromagnetic attraction is Maxwell's formula, and its expression is:

[0236]

[0237] F: Electromagnetic attraction

[0238] B: Magnetic flux density or magnetic induction intensity

[0239] Magnetic flux through a medium

[0240] S: Area of ​​magnetic field lines crossing magnetic poles

[0241] μ0: Air permeability

[0242] C: The correlation coefficient between the combination type and shape of the magnetic end faces, which has different values ​​for different scenarios. If it is the force generated between permanent magnets, then it is set to C. m2m The value is usually taken as 1, and the accurate value is obtained through actual measurement during the design process; if the force between the permanent magnet and the conductive magnet (yoke) is..., then C... m2y The value is usually taken as 1 / 2, and the accurate value is obtained through actual measurement during the design process; if it is the force between the magnetic conductor (yoke) and the magnetic conductor (yoke), it is denoted as C. y2y It is usually taken as 1 / 4, and the accurate value is obtained through actual measurement during the design process.

[0243] The above formula is used to calculate the magnetic field D above. 1，1 The electromagnetic attraction in magnetic field D2 is as follows:

[0244]

[0245] Among them, S D1 S D2 These are the areas of the annular end faces corresponding to magnetic domains 1 and 2, respectively, and S D1 =S D1 =S D Therefore:

[0246]

[0247]

[0248] Among them are:

[0249]

[0250]

[0251] because

[0252] F 动圈 =F1-F2

[0253] Then there is

[0254] F 动圈，linear =F 动圈 , linear +F 动圈，nonlinear

[0255]

[0256] F1，linear F 2，linear F 1，nonlinear F 1，nonlinear Substitute F respectively 动圈，linear and F 动圈，nonlinear The calculations are as follows:

[0257]

[0258] because

[0259]

[0260]

[0261] Therefore:

[0262]

[0263] Similarly, calculate F. 动圈，nonlinear ,

[0264]

[0265] Therefore, the net force on the moving coil, which acts as the moving part, is:

[0266]

[0267] From the above derivation process, the following characteristics can be observed:

[0268] 1) In the linear term of the resultant force F 动圈，linear In the middle, the component force F 1，linear and F 2，linear The linear terms of each individual are superimposed to form the resultant linear term F. 动圈，linear The coefficient of the coil current is larger.

[0269] 2) In the resultant nonlinear term F 动圈，nonlinear In the middle, the component force F 1，nonlinear and F 2，nonlinear Their respective nonlinear terms cancel each other out, thus the resultant nonlinear term F 动圈，nonlinear It is zero.

[0270] We call the above design method the design method for moving-coil oscillators with nonlinear term cancellation. This method can be used not only for designing oscillators but also for designing brakes. The moving-coil oscillators or brakes obtained using the above method are also called moving-coil oscillator devices or brakes with nonlinear term cancellation.

[0271] Example 7

[0272] Please refer to Figure 16-20 The design method for a moving-coil oscillator with canceled nonlinear terms includes the following conditions:

[0273] (1): A moving coil oscillator body 11 is provided. The moving coil oscillator body 11 includes an outer cylinder 1, a transmission plate 8, a stator assembly and a mover assembly. The stator assembly includes a magnet assembly structure. The mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 3 and a first magnetic conductor or a first non-magnetic conductor 2. The coil assembly structure includes a coil 6 and a second magnetic conductor or a second non-magnetic conductor 7. The stator assembly is fixed inside the outer cylinder 1. The transmission plate 8 is fixed on the outer cylinder 1. The mover assembly and the transmission plate 8 are fixedly connected through at least one point. The mover assembly moves while the stator assembly does not move. The mover assembly is called a moving component.

[0274] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0275] (3): The moving coil oscillator body 11 has 2N magnetic domains D arranged in pairs inside. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...;

[0276] The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

[0277] In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

[0278] In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D... 1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,iIn the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0279] The vibration transmission plate 8 can be rectangular, circular, racetrack-shaped or three-dimensional depending on the application scenario, and can be used in combination according to different application scenarios; the vibration transmission plate 8 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0280] The stator assembly is fixed inside the outer cylinder 1, which can be on the inner wall, top surface, or bottom surface of the outer cylinder 1;

[0281] The moving part assembly is fixedly connected to the vibration transmission plate 8 through at least one point, which includes point contact and surface contact, and can be one point, two points, or multiple points.

[0282] The number of permanent magnets 3 and coils 6 is limited, with 1 permanent magnet and 2 coils.

[0283] The moving coil oscillator body 11 has four magnetic domains D arranged in pairs symmetrically. 1,1 D 2,1 D 1,2 D 2,2 Among them, magnetic domain D 1,1 With D 2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetrical; the closed curves of the main magnetic field lines of the coil 6 and the closed curves of the main magnetic field lines of the permanent magnet 3 respectively cross the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 6 is opposite to that of the permanent magnet 3, while in the magnetic field domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil 6 is the same as the direction of the magnetic field lines of the permanent magnet 3;

[0284] The moving component is subjected to four forces; each force comprises two parts, one being a linear term of the excitation current i and the other being a nonlinear term of the excitation current i:

[0285] F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N;

[0286] The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i.

[0287] F动圈,合力 (i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i)

[0288] in:

[0289]

[0290]

[0291]

[0292] F 动圈,合力,nonlinear (i)≡0, meaning the nonlinear terms in each component force cancel each other out to zero, then F 动圈,合力 (i)=F 动圈,合力,linear (i) means that the resultant force and the excitation current are always linearly related, thus obtaining the moving coil oscillator with the nonlinear terms canceled.

[0293] The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curves of the main magnetic field lines of the coil 6 and the closed curves of the main magnetic field lines of the permanent magnet 3 alternately pass through the moving part assembly and the stator assembly, respectively.

[0294] It also includes the following conditions:

[0295] (3.1): Looking outward from the center, the permanent magnet 3 is on the outside, and the coil 6 is on the outside;

[0296] (3.2):N 圈 =2; n=1;

[0297] (3.3): When N 圈 When the value is greater than 1, the current in adjacent coil 6 is in the opposite direction, and the electromagnetic fields of two adjacent coils 3 and their two adjacent end faces have the same polarity.

[0298] A magnetic conductor is used near the outer cylinder 1 of the coil 6 to minimize the magnetic resistance of the magnetic circuit formed by the coil 6 to the electromagnet 3; the permanent magnets 3 in the magnet assembly are isolated by a magnetic conductor; a yoke is used around the coil 6 and the permanent magnets 3, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder 1 near the coil 6.

[0299] Example 8

[0300] Please refer to Figure 16-20The nonlinear term cancellation moving-coil oscillator device designed using the method of Example 7 includes a moving-coil oscillator body 11. The moving-coil oscillator body 11 includes an outer cylinder 1, vibration transmission plates 8, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The coil assembly structure includes a coil 6 and a second magnetic conductor or a second non-magnetic conductor 7. The magnet assembly structure includes a permanent magnet 3 and a first magnet or a first non-magnetic conductor 2. The coil assembly structure also includes a first magnetic conductor ring 4 and a second magnetic conductor ring 5. Viewed from the center outwards, the coil 6 is inside, and the permanent magnet 3 is outside. There are two coils 6, and the current directions in adjacent coils 6 are opposite. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 6 are the same. Two vibration transmission plates 8 are provided, and the two vibration transmission plates 8 are respectively fixed to the top and bottom surfaces of the outer cylinder 1. The two ends of the second magnetic conductor or the second non-magnetic conductor 7 are respectively fixed on the vibration plate 8. The two coils 6 are fixed around the second magnetic conductor or the second non-magnetic conductor 7. The second magnetic ring 5 is fixed between the two coils 6. The second magnetic conductor or the second non-magnetic conductor 7 is also provided with a first magnetic ring 4. The permanent magnet 3 is fixed in the middle of the inner wall of the outer cylinder 1. The first magnetic conductor or the first non-magnetic conductor 2 is fixed on both sides of the permanent magnet 3. The first magnetic conductor or the first non-magnetic conductor 2 is fixed on the inner wall of the outer cylinder 1. The moving part assembly and the stator assembly are arranged in an interlocking shape. The closed curve of the main magnetic force line of the coil 6 and the closed curve of the main magnetic force line of the permanent magnet 3 alternately pass through the moving part assembly and the stator assembly. The moving coil type oscillator body 11 has four magnetic domains D designed symmetrically in pairs inside. 1,1 D 2,1 D 1,2 D 2,2 Among them, magnetic domain D 1,1 With D 2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetrical, the closed curves of the main magnetic field lines of the coil 6 and the closed curves of the main magnetic field lines of the permanent magnet 3 respectively cross the magnetic domain D. 1,1 D 2,1 D 1,2 D 2,2 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 6 is opposite to that of the permanent magnet 3, while in the magnetic domain D... 2,1 In this configuration, the magnetic field lines of the coil 6 are in the same direction as the magnetic field lines of the permanent magnet 3.

[0301] Please refer to the appendix. Figure 16 In the figure, there are four air gaps that form magnetic fields D. 1,1 D 2,1 D1,2 D 2,2 Within the magnetic field domain, the total magnetic flux / magnetic induction intensity generated by the superposition of the magnetic field produced by the permanent magnet and the magnetic field produced by the coil electromagnet causes interaction forces to be generated in the components surrounding the magnetic field domain. The magnetic field D above... 1,1 D 2,1 D 1,2 D 2,2 Both are composed of stator and mover components, and therefore, in these magnetic domains, there will be interactive forces between the stator and mover components.

[0302] In the diagram above, the current through coil C1 is i1, the current through coil C2 is i2, and the corresponding magnetic fluxes of the coils are Φ and Φ, respectively. i1 and Φ i2 The magnetic flux corresponding to the permanent magnet M1 is Φ. m .

[0303] Magnetic domain D 1,1 D 2,1 D 1,2 D 2,2 Magnetic fields can be paired in pairs according to the symmetry case for D j =(D 1,j D 2,j ), j = 1, 2; including magnetic field pairs D1 = (D 1,1 D 2,1 ), and magnetic field pair D2=(D 1,2 D 2,2 ).

[0304] 1) Magnetic domain to D j =(D 1,j D 2,j When j=1, that is, the magnetic field pair D1=(D 1,1 D 2,1 ) magnetic flux

[0305] In magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines corresponding to coil C1 is opposite to the direction of the magnetic field lines corresponding to permanent magnet M1. Therefore, in the magnetic field domain D... 1,1 In the middle, the total magnetic flux is Φ i1 and Φ M1 =Φ m The difference. In the magnetic domain D 2,1 In the magnetic field, the direction of the magnetic field lines corresponding to coil C2 is the same as the direction of the magnetic field lines corresponding to permanent magnet M1. Therefore, in the magnetic field domain D... 2,1 In the middle, the total magnetic flux is Φ i2 and Φ M1 =Φ m The added value.

[0306] Assume i1 = i2 = i, Φi1 =Φ i2 =Φ i If the magnetic field lines of magnet M1 are in the positive direction and the magnetic flux is also positive, then we have

[0307] Φ D1,1 =Φ M1 -Φ i1 =Φ m -Φ i

[0308] Φ D2,1 =Φ M1 +Φ i2 =Φ m +Φ i

[0309] 2) Magnetic domain to D j =(D 1,j D 2,j When i = 2, that is, the magnetic field pair (D) 1,2 D 2,2 ) magnetic flux

[0310] In magnetic domain D 1,2 In the middle, only the magnetic field lines corresponding to coil C1 pass through, therefore the total magnetic flux is only Φ. i1 =Φ i In the magnetic domain D 2,2 In the middle, only the magnetic field lines corresponding to coil C2 pass through, therefore the total magnetic flux is only Φ. i2 =Φ i .

[0311] Assume that the magnetic reluctance of the magnetic circuit formed by the electromagnetic field generated by the current i in coils C1 and C2 is Z. i Let N be the number of turns in coils C1 and C2, and i be the current intensity. Then we have:

[0312]

[0313] Assume the permeability of the magnetic circuit formed by the electromagnetic field generated by the current is G. i Then we have:

[0314]

[0315] The magnetic flux corresponding to a permanent magnet can also be expressed using the formula for magnetic induction intensity. Assume the magnetic induction intensities at the extreme ends of permanent magnet M1 are B... m The area of ​​the magnetic pole end is S. m It can be obtained that...

[0316] Therefore,

[0317]

[0318]

[0319] Appendix Figure 16 This is a schematic diagram showing the closed magnetic field lines of coils C1 and C2, and the closed magnetic field line of magnet M1. In the diagram, the closed magnetic field lines generated by coil C1 pass through the magnetic gap D. 1,1 D 1,2 The closed magnetic field lines generated by coil C2 pass through the magnetic gap D. 2,1 D 2,2 The closed magnetic field lines generated by magnet M1 pass through the magnetic gap D in sequence. 1,1 D 2,1 .

[0320] Appendix Figure 17 It is a moving component, magnetic domain D 1,1 D 2,1 D 1,2 D 2,2 Relationship diagram with stator assembly. In magnetic domain D 1,1 The moving part is subjected to a leftward attractive force F from the stator assembly. 1,1 In the magnetic domain D 2,1 The drive assembly is subjected to a rightward attractive force F from the stator assembly. 2,1 In the magnetic domain D 1,2 The drive assembly is subjected to a rightward attractive force F from the stator assembly. 1,2 In the magnetic domain D 2,2 The moving part is subjected to a leftward attractive force F from the stator assembly. 2,2 .

[0321] Assuming magnetic field pair D j =(D 1,j D 2,j The resultant force corresponding to this is F. j (The positive and negative signs indicate different directions of the force). Taking the rightward direction as positive, the resultant force of the stator assembly on the mover assembly is...

[0322] F 动圈 =F1+F2=-F 1,1 +F 2,1 +F 1,2 -F 2,2

[0323] F 动圈 =F1+F 2＝ (-F 1,1 +F 2,1 )+(F 1,2 -F 2,2 )

[0324] Where F j It corresponds to the magnetic field pair Dj =(D 1,j D 2,j The combined force of ).

[0325] Appendix Figure 20 This is a force analysis diagram isolated from the mover assembly. The mover assembly is subjected to a component force F from the stator assembly. 1,1 F 2,1 F 1,2 F 2,2 Their combined force is:

[0326] F 动圈 =F1+F2=(-F 1,1 +F 2,1 )+(F 1,2 -F 2,2 )

[0327] The above can also be expressed as follows: the direction of the force is reflected in the sign of the component forces, as shown below:

[0328]

[0329] Each component force is divided into pairs of paired magnetic domains, each corresponding to a different magnetic domain pair D. j The resultant force of the component forces, for example, F1 = -F 1,1 +F 2,1 and F2 = F 1,2 -F 2,2 Then calculate the total resultant force.

[0330] Further derive the formulas for the electromagnetic forces generated in each magnetic domain. The electromagnetic attraction acting on a magnetized ferromagnetic object is proportional to the total area of ​​the magnetic field lines passing through the magnetic poles and the square of the magnetic flux density. If the magnetic flux density B is uniformly distributed along the surface of the magnetic poles, and the calculated air gap length is small, then the formula for calculating the electromagnetic attraction is Maxwell's formula, and its expression is:

[0331]

[0332] F: Electromagnetic attraction

[0333] B: Magnetic flux density or magnetic induction intensity

[0334] Magnetic flux through a medium

[0335] S: Area of ​​magnetic field lines crossing magnetic poles

[0336] μ0: Air permeability

[0337] C: The correlation coefficient between the combination type and shape of the magnetic end faces, which has different values ​​for different scenarios. If it is the force generated between permanent magnets, it is denoted as C. m2m The value is usually taken as 1, and the accurate value is obtained through actual measurement during the design process; if the force between the permanent magnet and the conductive magnet (yoke) is..., then C... m2y The value is usually taken as 1 / 2, and the accurate value is obtained through actual measurement during the design process; if it is the force between the magnetic conductor (yoke) and the magnetic conductor (yoke), it is denoted as C. y2y It is usually taken as 1 / 4, and the accurate value is obtained through actual measurement during the design process.

[0338] 1)F j, The calculation for j=1 corresponds to the magnetic field pair D. j =(D 1,j D 2,j ), j=1

[0339] Corresponding magnetic field pair D1=(D 1,1 D 2,1 The resultant force of the component forces is F1 = -F 1,1 +F 2,1 The above formula is used to calculate the magnetic field D above. 1,1 and magnetic field D 2,1 The electromagnetic attraction in the middle includes:

[0340]

[0341] Among them, S D1,1 S D2,1 They are magnetic domain D 1,1 and D 2,1 The area of ​​the corresponding annular end face, and S D1,1 =S D2,1 =S D Therefore:

[0342]

[0343]

[0344] Among them are:

[0345]

[0346]

[0347] because

[0348] F1 = -F 1，1 +F 2，1

[0349] Then there is

[0350] F 1，linear =F 1，linear +F 1，nonlinear

[0351]

[0352] F 1，1，linear F 2，1，linear F 1，1，nonlinear F 1，1，nonlinear Substitute F respectively 1，linear and F 1，nonlinear The calculations are as follows:

[0353]

[0354]

[0355] because

[0356]

[0357]

[0358] Therefore:

[0359]

[0360] Similarly, calculate F. 1，nonlinear ,

[0361]

[0362] Therefore, D1 = (D 1，1 D 2，1 The resultant force of the component forces is:

[0363]

[0364] 2)F j，j The calculation of =2 corresponds to the magnetic field pair D j =(D 1，j D 2，j ), j=2

[0365] Corresponding magnetic field pair D2=(D 1，2 D 2，2 The resultant force of the component forces is F2 = F 1，2 -F 2，2 Calculate the magnetic field D above. 1，2 and magnetic field D 1，2 The electromagnetic attraction in the middle includes:

[0366]

[0367] Among them, S D1，2 SD2，2 They are magnetic domain D 1，2 and D 2，2 The area of ​​the corresponding annular end face, and S D1，2 =S D2，2 =S D Therefore:

[0368]

[0369] Therefore,

[0370]

[0371] It can be obtained

[0372]

[0373] Because of the net force on the moving part

[0374] F 动圈 =F1+F2

[0375] F 动圈 =F 动圈，linear +F 动圈，nonlinear

[0376] all:

[0377]

[0378] F 动圈，nonlinear =F 1，nonlinear +F 2，nonlinear =0+0=0

[0379] From the above derivation process, the following characteristics can be observed:

[0380] 1. In the linear term of the resultant force F 动圈，linear In the middle, the component force F 1，linear and F 2，linear The linear terms of each individual are superimposed to form the resultant linear term F. 动圈，linear The relationship between the coil current and the coil current remains linear.

[0381] 2. In the nonlinear term F of the resultant force 动圈,nonlinear In the middle, the component force F 1,nonlinear and F 2,nonlinear Their respective nonlinear terms cancel each other out, thus the resultant nonlinear term F 动圈,nonlinear It is zero.

[0382] We call the above design method the design method for moving-coil oscillators with nonlinear term cancellation. This method can be used not only for designing oscillators but also for designing brakes. The moving-coil oscillators or brakes obtained using the above method are also called moving-coil oscillator devices or brakes with nonlinear term cancellation.

[0383] Example 9

[0384] Please refer to Figure 21-25 The design method for a moving-coil oscillator with canceled nonlinear terms includes the following conditions:

[0385] (1): A moving coil oscillator body 11 is provided. The moving coil oscillator body 11 includes an outer cylinder 1, a transmission plate 9, a stator assembly and a mover assembly. The stator assembly includes a magnet assembly structure. The mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet 3 and a first magnetic conductor or a first non-magnetic conductor 10. The coil assembly structure includes a coil 4 and a second magnetic conductor or a second non-magnetic conductor 7. The stator assembly is fixed inside the outer cylinder 1. The transmission plate 9 is fixed on the outer cylinder 1. The mover assembly and the transmission plate 8 are fixedly connected through at least one point. The mover assembly moves while the stator assembly does not move. The mover assembly is called a moving component.

[0386] (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

[0387] (3): The moving coil oscillator body 11 has 2N magnetic domains D arranged in pairs inside. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...

[0388] The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

[0389] In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

[0390] In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D...1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

[0391] The vibration transmission plate 9 can be rectangular, circular, racetrack-shaped or three-dimensional depending on the application scenario, and can be used in combination according to different application scenarios; the vibration transmission plate 9 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0392] The stator assembly is fixed inside the outer cylinder 1, which can be on the inner wall, top surface, or bottom surface of the outer cylinder 1;

[0393] The moving part assembly is fixedly connected to the vibration transmission plate 9 through at least one point, which includes point contact and surface contact, and can be one point, two points, or multiple points.

[0394] The number of permanent magnets 3 and coils 4 is limited, with 3 permanent magnets 3 and 2 coils;

[0395] The moving coil oscillator body 11 has six magnetic domains D arranged in pairs symmetrically. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 , where the magnetic domain D 1,1 With D 2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetry, magnetic domain D 1,3 and D 2,3 Symmetrical, the closed curves of the main magnetic field lines of the coil 4 and the closed curves of the main magnetic field lines of the permanent magnet 3 respectively cross the magnetic domain D. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 4 is the same as that of the permanent magnet 3, while in the magnetic domain D... 2,1 In the magnetic field, the direction of the magnetic field lines of the coil 4 is opposite to the direction of the magnetic field lines of the permanent magnet 3; in the magnetic domain D 1,2 In the magnetic field, the direction of the magnetic field lines of the coil 4 is opposite to that of the permanent magnet 3, while in the magnetic domain D...2,1 In this configuration, the direction of the magnetic field lines of the coil 4 is the same as the direction of the magnetic field lines of the permanent magnet 3;

[0396] The moving component is subjected to six forces; each force comprises two parts, one being a linear term of the excitation current i and the other a nonlinear term of the excitation current i:

[0397] F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N;

[0398] The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i.

[0399] F 动圈,合力 (i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i)

[0400] in:

[0401]

[0402]

[0403]

[0404] That is, the nonlinear terms in each component force either partially or completely cancel each other out, resulting in the final total resultant force ∑. i (F 1,i +F 2,i In this process, the total resultant force partially or completely cancels out the nonlinear term of the current, while the linear terms are superimposed and increase, thus obtaining a moving coil oscillator with the nonlinear term canceled out.

[0405] The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curves of the main magnetic field lines of the coil 4 and the closed curves of the main magnetic field lines of the permanent magnet 3 alternately pass through the moving part assembly and the stator assembly, respectively.

[0406] It also includes the following conditions:

[0407] (3.1): Looking outward from the center, the permanent magnet 3 is on the outside, and the coil 4 is on the outside;

[0408] (3.2):N 圈 =2; n=1;

[0409] (3.3): When N 圈 When the value is greater than 1, the current in adjacent coils 4 is in the opposite direction, and the electromagnetic fields of two adjacent coils 4 at their two nearest end faces have the same polarity.

[0410] A magnetic conductor is used near the outer cylinder 1 of the coil 4 to minimize the magnetic resistance of the magnetic circuit formed by the coil 4 to the electromagnet 3; the permanent magnets 3 in the magnet assembly are isolated from each other by a magnetic conductor; a yoke is used around the coil 4 and the permanent magnets 3, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder 1 near the coil 4.

[0411] Example 10

[0412] Please refer to Figure 21-25 The nonlinear term cancellation moving-coil oscillator device designed using the method of Embodiment 9 includes a moving-coil oscillator body 11. The moving-coil oscillator body 11 includes an outer cylinder 1, vibration transmission plates 9, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The coil assembly structure includes a coil 4 and a second magnetic conductor or a second non-magnetic conductor 7. The magnet assembly structure includes a permanent magnet 3 and a first magnetic conductor or a first non-magnetic conductor 10. The coil assembly structure also includes a first magnetic ring 5 and a second magnetic ring 6. The magnet assembly structure also includes a third magnetic ring 2. Viewed from the center outward, the coil 4 is inside, and the permanent magnet 3 is outside. There are two coils 4, and the current directions in adjacent coils 4 are opposite. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 4 are the same. There are three permanent magnets 3, and the polarities of the two opposite end faces of adjacent permanent magnets 3 are the same. There are two vibration transmission plates 9, which are respectively fixed to the top and bottom surfaces of the outer cylinder 1. The two ends of the second magnetic conductor or the second non-magnetic conductor 7 are respectively fixed on the vibration plate 9. The two coils 4 are fixed around the second magnetic conductor or the second non-magnetic conductor 7. The second magnetic conductor or the second non-magnetic conductor 7 is provided with the first magnetic ring 5. The second magnetic ring 6 is fixed between the two coils 4. The three permanent magnets 3 are fixed in sequence on the inner wall of the outer cylinder 1. The first magnetic conductor or the first non-magnetic conductor 10 is fixed between adjacent permanent magnets 3. The third magnetic ring 2 is fixed on the outside of the first magnetic conductor or the first non-magnetic conductor 10. The first magnetic conductor or the first non-magnetic conductor 10 and the third magnetic ring 2 are fixed on the inner wall of the outer cylinder 1. The moving part assembly and the stator assembly are arranged in an interlocking shape. The closed curve of the main magnetic force line of the coil 4 and the closed curve of the main magnetic force line of the permanent magnet 3 alternately pass through the moving part assembly and the stator assembly. The moving coil type oscillator body 11 has 6 magnetic domains D designed symmetrically in pairs inside. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 , where the magnetic domain D 1,1 With D2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetry, magnetic domain D 1,3 and D 2,3 Symmetrical, the closed curves of the main magnetic field lines of the coil 4 and the closed curves of the main magnetic field lines of the permanent magnet 3 respectively cross the magnetic domain D. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 And in the magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines of the coil 4 is the same as that of the permanent magnet 3, while in the magnetic domain D... 2,1 In the magnetic field, the direction of the magnetic field lines of the coil 4 is opposite to the direction of the magnetic field lines of the permanent magnet 3; in the magnetic domain D 1,2 In the magnetic field, the direction of the magnetic field lines of the coil 4 is opposite to that of the permanent magnet 3, while in the magnetic domain D... 2,1 In this configuration, the magnetic field lines of the coil 4 are in the same direction as the magnetic field lines of the permanent magnet 3.

[0413] Please refer to the appendix. Figure 22 The magnetic field domain D is formed by six air gaps. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 Within the magnetic field domain, the total magnetic flux / magnetic induction intensity generated by the superposition of the magnetic field generated by the permanent magnet 3 and the electromagnet of the coil 4 causes the components surrounding the magnetic field to interact with each other. The magnetic field D above... 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 Both are composed of stator and mover components, and therefore, in these magnetic domains, there will be interaction forces between the stator and mover components.

[0414] Please refer to the appendix. Figure 23 Draw the closed magnetic field lines of magnets M1, M2, and M3, as well as the closed magnetic field lines of coils C1 and C2. In the diagram, the closed magnetic field lines generated by magnet M1 pass through the magnetic gap D. 1,2 D 1,3 The closed magnetic field lines generated by magnet M2 pass through the magnetic gap D. 1,1 D 2,1 The closed magnetic field lines generated by magnet M3 pass through the magnetic gap D. 2,2 D 2,3 The closed magnetic field lines generated by coil C1 pass through the magnetic gap D in sequence. 1,1D 1,2 The closed magnetic field lines generated by coil C2 pass through the magnetic gap D in sequence. 2,1 D 2,2 .

[0415] Assume the currents through coils C1 and C2 are i1 and i2 respectively, and i1 = i2 = i. The corresponding magnetic flux of each coil is Φ. i1 , Φ i2 For the sake of simplicity, assume Φ i1 =Φ i2 =Φ i The magnetic fluxes corresponding to permanent magnets M1, M2, and M3 are Φ, respectively. M1 =Φ M2 =Φ M2 =Φ m (Another possibility is that the magnetic induction intensities B1, B2, and B3 of M1, M2, and M3 have a relationship where B1 = B3 ≠ B2, or the magnetic circuit structure of M1, M2, and M3 causes the reluctance of M2 to be different from that of M1 and M3, thus Φ...) m1 =Φ m3 ≠Φ m2 In this case, because it is still a symmetrical design, the conclusion that the nonlinear terms in the resultant force of the paired forces cancel each other out still holds.

[0416] Magnetic domain D 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 We can group them in pairs according to the symmetry, D 1,1 D 2,1 It is the first pair of magnetic fields arranged symmetrically, D 1,2 D 2,2 It is the second pair of magnetic fields arranged symmetrically, D 1,3 D 2,3 It is the third pair of magnetic domains arranged symmetrically.

[0417] 1) Magnetic domain to D j =(D 1,j D 2,j ), j=1

[0418] In magnetic domain D 1,1 In the magnetic field, the direction of the magnetic field lines corresponding to magnet M1 is the same as the direction of the magnetic field lines corresponding to coil C1. Therefore, in the magnetic field domain D... 1,1 In the middle, the total magnetic flux is Φ i1 and Φ m1 The added value. In the magnetic domain D 2,1 In the magnetic field, the direction of the magnetic field lines corresponding to magnet M2 is opposite to the direction of the magnetic field lines corresponding to coil C2. Therefore, in the magnetic field domain D... 2,1In the middle, the total magnetic flux is Φ i2 and Φ M2 =Φ m Impairment.

[0419] Assume Φ m1 =Φ m3 ≠Φ m2 Assuming that the magnetic field lines of the permanent magnet are in the positive direction and the magnetic flux is also positive in each magnetic domain, then we have:

[0420] Φ D1,1 =Φ i1 +Φ m2 =Φ m2 +Φ i

[0421] Φ D2,1 =Φ i2 +Φ m2 =Φ m2 -Φ i

[0422] 2) Magnetic domain to D j =(D 1,j D 2,j ), j=2

[0423] In magnetic domain D 1,2 In the magnetic field, the direction of the magnetic field lines corresponding to magnet M1 is opposite to the direction of the magnetic field lines corresponding to coil C1. Therefore, in the magnetic field domain D... 1,2 In the middle, the total magnetic flux is Φ i1 =Φ i and Φ m1 The difference. In the magnetic domain D 2,2 In the magnetic field, the direction of the magnetic field lines corresponding to magnet M3 is the same as the direction of the magnetic field lines corresponding to coil C2. Therefore, in the magnetic field domain D... 2,2 In the middle, the total magnetic flux is Φ m3 =Φ m1 and Φ i2 =Φ i The added value.

[0424] Assume i1 = i2i, Φ m1 =Φ m3 ≠Φ m2 Assuming that the magnetic field lines of the permanent magnet are in the positive direction and the magnetic flux is also positive in each magnetic domain, then we have

[0425] Φ D1,2 =Φ M1 -Φ i1 =Φ m1 -Φ i

[0426] Φ D2,2 =Φ M3 +Φi2 =Φ m3 +Φ i

[0427] 3) Magnetic domain to D j =(D 1,j D 2,j ), j=3

[0428] In magnetic domain D 1,3 In the middle, only the magnetic field lines corresponding to magnet M1 pass through, therefore the total magnetic flux is only Φ. m1 In the magnetic domain D 2,3 In the middle, only the magnetic field lines corresponding to magnet M3 pass through, therefore the total magnetic flux is only Φ. m3 =Φ m1 .

[0429] Assume that the magnetic reluctance of the magnetic circuit formed by the electromagnetic field generated by the current i in coils C1 and C2 is Z. i Let N be the number of turns in coils C1 and C2, and i be the current intensity. Then we have:

[0430]

[0431] Assume the permeability of the magnetic circuit formed by the electromagnetic field generated by the current is G. i Then we have:

[0432]

[0433] Another scenario is: magnetic induction intensity B of M1, M2, and M3. m1 B m2 B m3 There is B m1 =B m3 ≠B m2 Or because the magnetic pole end areas S of M1, M2, and M3 m1 =S m3 ≠S m2 This results in the reluctance of M2 being different from that of M1 and M3. Because the magnetic flux corresponding to a permanent magnet can be expressed using the formula for magnetic induction intensity, we can obtain:

[0434]

[0435] The above formula can be transformed into:

[0436]

[0437]

[0438]

[0439] As can also be seen from the formula above, when Bm1 =B m3 ≠B m2 S m1 =S m3 ≠S m2 Then the magnetic field pair D2=(D 1,2 D 2,2 ), and magnetic field pair D1=(D 1,1 D 2,1 ), D3=(D 1,3 D 2,3 The magnetic flux in the force still possesses the property that the nonlinear terms of the current in the corresponding component force can be canceled out.

[0440] A special case, when B m1 =B m3 =B m2 =B m， S m1 =S m3 =S m2 =S m Therefore, Φ m1 =Φ m3 =Φ m2 =Φ m At this point, the formula above becomes:

[0441]

[0442]

[0443]

[0444] Appendix Figure 24 It is a moving component, magnetic domain D 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 Relationship diagram with stator assembly. In magnetic domain D 1,1 The moving part is subjected to a leftward attractive force F from the stator assembly. 1,1 In the magnetic domain D 2,1 The drive assembly is subjected to a rightward attractive force F from the stator assembly. 2,1 In the magnetic domain D 1,2 The drive assembly is subjected to a rightward attractive force F from the stator assembly. 1,2 In the magnetic domain D 2,2 The moving part is subjected to a leftward attractive force F from the stator assembly. 2,2 In the magnetic domain D 1,3 The moving part is subjected to a leftward attractive force F from the stator assembly. 1,3 In the magnetic domain D 2,3The drive assembly is subjected to a rightward attractive force F from the stator assembly. 2,3 Define the magnetic field pair D j =(D 1,j D 2,j The resultant force corresponding to this magnetic field is the force exerted by the magnetic field on D. j The corresponding resultant force F j =F 1,j +F 2,j Assuming rightward is the positive direction, then when F... 1,j or F 2,j When the direction is to the right, its sign is positive; then when F... 1,j or F 2,j When the direction is to the left, its sign is negative. Therefore, the net force on the moving component from the stator component is:

[0445] F 动圈 =F1+F2+F3=-F 1,1 +F 2,1 +F 1,2 -F 2,2 +-F 1,3 +F 2,3

[0446] F 动圈 =F1+F2+F3=(-F 1,1 +F 2,1 )+(F 1,2 -F 2,2 )+(-F 1,3 +F 2,3 )

[0447] F above j Corresponding magnetic field pair D j =(D 1,j D 2,j The resultant force of the component forces that generate forces on the moving part component.

[0448] Appendix Figure 25 This is a force analysis diagram isolated from the mover assembly. The mover assembly is subjected to a component force F from the stator assembly. 1,1 F 2,1 F 1,2 F 2,2 F 1,3 F 2,3 When performing calculations, according to the magnetic domain, D j =(D 1,j D 2,j First, calculate F. j Then calculate the resultant force of the moving part assembly, which is:

[0449] F 动圈 =F1+F2+F3=(-F 1,1 +F2,1 )+(F 1,2 -F 2,2 )+(-F 1,3 +F 2,3 )

[0450] The above can also be expressed as follows: assuming that the algebraic signs of the component forces simultaneously indicate the direction of the force through positive and negative signs, then:

[0451]

[0452] We first calculate the resultant force of the component forces generated in each pair of paired magnetic domains, that is, we calculate the resultant force of each pair of magnetic domains D1 = (D 1,1 D 2,1 The resultant force F1 = -F 1,1 +F 2,1 Magnetic domain pair D2=(D 1,2 D 2,2 The resultant force F1 = F 1,2 -F 2,2 Magnetic domain pair D3=(D 1,3 D 2,3 The resultant force F3 = -F 1,3 +F 2,3 Then calculate the total resultant force.

[0453] First, derive the formula for the electromagnetic force generated in each magnetic field. The magnitude of the electromagnetic attraction acting on a magnetized ferromagnetic object is proportional to the total area of ​​the magnetic field lines passing through the magnetic poles and the square of the magnetic flux density. If the magnetic flux density B is uniformly distributed along the surface of the magnetic poles, and the calculated air gap length is small, then the formula for calculating the electromagnetic attraction is Maxwell's formula, and its expression is:

[0454]

[0455] F: Electromagnetic attraction

[0456] B: Magnetic flux density or magnetic induction intensity

[0457] Magnetic flux through a medium

[0458] S: Area of ​​magnetic field lines crossing magnetic poles

[0459] μ0: Air permeability

[0460] C: The correlation coefficient between the combination type and shape of the magnetic end faces, which has different values ​​for different scenarios. If it is the force generated between permanent magnets, then C... m2m The value is usually taken as 1, and the accurate value is obtained through actual measurement during the design process; if the force between the permanent magnet and the conductive magnet (yoke) is..., then C...m2y The value is usually taken as 1 / 2, and the accurate value is obtained through actual measurement during the design process; if it is the force between the magnetic conductor (yoke) and the magnetic conductor (yoke), it is denoted as C. y2y It is usually taken as 1 / 4, and the accurate value is obtained through actual measurement during the design process.

[0461] 1) Magnetic domain to D j =(D 1,j D 2,j When j=1, that is, D1=(D1,,D 2,1 The corresponding resultant force F1 = -F 1,1 +F 2,1

[0462] The above formula is used to calculate the magnetic field D above. 1,1 and magnetic field D 2,1 The electromagnetic attraction in the middle includes:

[0463]

[0464] Among them, S D1,1 S D2,1 They are magnetic domain D 1,1 and D 2,1 The area of ​​the corresponding annular end face, and S D1,1 =S D2,1 =S D1 Therefore:

[0465]

[0466]

[0467] Among them are:

[0468]

[0469]

[0470] because

[0471] F1 = -F 1,1 +F 2,1

[0472] Then there is

[0473] F 1，linear =F 1，linear +F 1，nonlinear

[0474]

[0475] F 1，1，linear F 2，1，linear F1，1，nonlinear F 1，1，nonlinear Substitute F respectively 1，linear and F 1，nonlinear The calculations are as follows:

[0476]

[0477] because

[0478]

[0479]

[0480] Therefore:

[0481]

[0482] Similarly, calculate F. 1，nonlinear ,

[0483]

[0484] Thus, the magnetic field affects D 1,1 and D 2,1 The corresponding resultant force is:

[0485]

[0486] 2) Magnetic domain to D j =(D 1,j D 2,j When j=2, that is, D2=(D 1,2 D 2,2 The corresponding resultant force F2 = F 1,2 -F 2,2

[0487] The above formula is used to calculate the magnetic field D above. 1,2 and magnetic field D 2,2 The electromagnetic attraction in the middle includes:

[0488]

[0489] Among them, S D1,2 S D2,2 They are magnetic domain D 1,2 and D 2,2 The area of ​​the corresponding annular end face, and S D1,2 =S D2,2 =S D2 Therefore:

[0490]

[0491]

[0492] Among them are:

[0493]

[0494]

[0495] because

[0496] F2 = F 1，2 -F 2，2

[0497] Then there is

[0498] F 2，linear =F 2，linear +F 2，nonlinear

[0499]

[0500] F 1，1，linear F 2，1，linear F 1，1，nonlinear F 1，1，nonlinear Substitute F respectively 1，linear and F 1，nonlinear The calculations are as follows:

[0501]

[0502] because

[0503]

[0504]

[0505] Therefore:

[0506]

[0507] Similarly, calculate F. 2，nonlinear ,

[0508]

[0509] Thus, the magnetic field affects D 1，1 and D 2，1 The corresponding resultant force is:

[0510]

[0511] 3) Magnetic domain pair (D 1，j D 2，j When j=3, that is, D3=(D 1，3 D 2，3 The corresponding resultant force F3 = -F 1，3 +F 2，3

[0512] Calculate the magnetic field D above1，3 and magnetic field D 1，3 The electromagnetic attraction in the middle includes:

[0513]

[0514] Among them, S D1，3 S D2，3 They are magnetic domain D 1，3 and D 2，3 The area of ​​the corresponding annular end face, and S D1，3 =S D2，3 =S D3 Therefore:

[0515]

[0516] Therefore,

[0517]

[0518] It can be obtained

[0519]

[0520] 4) Calculate the resultant force on the moving part assembly.

[0521] F 动圈 =F1+F2+F3

[0522] F 动圈 =F 动圈，,linear +F 动圈，nonlinear

[0523] all:

[0524]

[0525] F 动圈，nonlinear =F 1，nonlinear +F 2,nonlinear +F 3,nonlinear =0+0+0

[0526] =0

[0527] From the above derivation process, the following characteristics can be observed:

[0528] 1. In the linear term of the resultant force F 动圈，linear In the middle, the magnetic field component force F 1，linear F 2，linear and F 3,linear The linear terms of each are superimposed to form the resultant linear term F. 动圈，linear The relationship between the coil current and the coil current remains linear.

[0529] 2. In the nonlinear term F of the resultant force 动圈，nonlinear In the middle, the magnetic field component force F1，nonlinear F 2，nonlinear and F 3，nonlinear Their respective nonlinear terms cancel each other out, thus the resultant nonlinear term F 动圈，nonlinear It is zero.

[0530] We call the above design a nonlinear term cancellation moving coil bone conduction oscillator or actuator design method.

[0531] Example 11

[0532] The permanent magnets described in the moving coil oscillators with nonlinear term cancellation in Examples 1-10, or magnets that can be replaced with magnetic components, and coils that can be replaced with coil components, are all within the scope of protection of this patent.

[0533] A magnetic component: The overall magnetic field formed by a single magnet or a combination of multiple magnets (n>1) is equivalent to that of a single magnet. The magnetic field generated by the magnets in this combination is in the same direction as a dominant magnetic field (if the magnetic field strengths of the multiple magnets differ significantly, their magnetic field directions may be opposite, but the overall magnetic field direction is the same as the dominant magnetic field direction), thus the overall magnetic field generated can be considered equivalent to that produced by a single magnetic component. Magnets are typically connected by a rigid or flexible structural component (between magnets, at the edge of magnets, or around magnets), or even without a structural component, by means of bonding, welding, embedding, screws, screws, riveting, pins, clips, clamps, brackets, sleeves, caps, or other methods.

[0534] Coil assembly: The overall magnetic field generated by a single coil or an assembly of multiple coils (n turns > 1) is equivalent to the magnetic field generated by a single coil. The magnetic field generated by the coils in the assembly is in the same direction as the magnetic field generated by a dominant coil (if the magnetic field strengths of the multiple coils differ significantly, their directions may be opposite, but the overall magnetic field direction is the same as that of the dominant coil). Therefore, the overall magnetic field generated can be considered equivalent to the current generated in a single coil assembly. Coils are typically connected by a rigid or flexible structural component (between coils, at the edge of coils, or around coils), or even without a structural component, by bonding, welding, embedding, screws, screws, riveting, pins, clips, clamps, brackets, sleeves, caps, or other means.

[0535] To describe the magnet and coil components in detail, the following embodiments are provided for specific description.

[0536] The magnet 201 is used in the following embodiments;

[0537] Example 1 of magnet component 201:

[0538] Reference Figure 28 As shown; permanent magnets are connected in series in the direction of the magnetic field, with no structural components in between, and n_magnet = 2;

[0539] Permanent magnet 1 and permanent magnet 2 are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0540] Example 2 of magnet 201:

[0541] Reference Figure 29 As shown; permanent magnets are connected in series in the direction of the magnetic field, with no structural components in between, and n_magnet = 3;

[0542] Permanent magnets 1, 2, and 3 are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other means. The magnetic fields generated by permanent magnets 1, 2, and 3 are all oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnets 1, 2, and 3, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) to a single magnet on the right. The combination of permanent magnets 1, 2, and 3 can be considered as a single magnet component 201.

[0543] Embodiment 3 of magnet 201:

[0544] Reference Figure 30 As shown; permanent magnets are connected in series in the direction of the magnetic field, with a structural component in the middle, n_magnetic = 2;

[0545] A magnetic conductor is placed between permanent magnet 1 and permanent magnet 2. Permanent magnet 1 and the magnetic conductor, as well as permanent magnet 2 and the magnetic conductor, are connected by adhesive, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered equivalent (indicated by the "=" sign in the diagram) to the single magnet on the right. The combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2 can be considered as a single magnet component 201.

[0546] The magnetic conductor mentioned above can also be replaced with a non-magnetic conductor, or a magnet with a much weaker magnetic field strength but in the opposite direction. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this situation also includes this type.

[0547] Example 4 of magnet 201:

[0548] Reference Figure 31 As shown; permanent magnets are connected in series in the direction of the magnetic field, with no structural components in between, and n_magnet = 2;

[0549] Permanent magnet 1 and permanent magnet 2, with permanent magnet 1 being larger and permanent magnet 2 being smaller, are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) to a single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0550] Embodiment 5 of magnet 201:

[0551] Reference Figure 32 As shown; permanent magnets are connected in series in the direction of the magnetic field, with a structural component in the middle, n_magnetic = 2;

[0552] Permanent magnet 1 and permanent magnet 2, with permanent magnet 1 being larger and permanent magnet 2 being smaller, are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) to a single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0553] Example 6 of magnet 201:

[0554] Reference Figure 33 As shown; permanent magnets are combined in parallel along the magnetic field direction, with no structural components in between, and n_magnet = 2;

[0555] Permanent magnet 1 and permanent magnet 2 are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0556] Embodiment 7 of magnet 201:

[0557] Reference Figure 34 As shown; permanent magnets are combined in parallel along the magnetic field direction, with no structural components in between, and n_magnet = 3;

[0558] Permanent magnets 1, 2, and 3 are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other means. The magnetic fields generated by permanent magnets 1, 2, and 3 are all oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnets 1, 2, and 3, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) to a single magnet on the right. The combination of permanent magnets 1, 2, and 3 can be considered as a single magnet component 201.

[0559] Example 8 of magnet 201:

[0560] Reference Figure 35 As shown; permanent magnets are combined in series and parallel in the direction of the magnetic field, with no structural components in between, and n_magnet = 3;

[0561] Permanent magnets 1, 2, and 3, and magnetic plates 1 and 2 are connected by bonding, welding, riveting, pins, grippers, brackets, sleeves, or other means. The magnetic fields generated by permanent magnets 1, 2, and 3 are all oriented towards the Y+ axis. The magnetic fields of magnetic plates 1 and 2 after magnetization are also oriented towards the Y+ axis, so all directions are the same. Therefore, the combination of permanent magnets 1, 2, and 3, and magnetic plates 1 and 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnets 1, 2, and 3, and magnetic plates 1 and 2 can be considered as a single magnet component 201.

[0562] The magnetic plate on top can also be replaced with a non-magnetic plate, or a magnet with a much weaker magnetic field strength but in the opposite direction. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this situation also includes this type.

[0563] Example 9 of magnet 201:

[0564] Reference Figure 36 As shown; permanent magnets are combined in parallel along the magnetic field direction, with a structural component in between, n_magnetic = 2;

[0565] A magnetic conductor is placed between permanent magnet 1 and permanent magnet 2. Permanent magnet 1 and the magnetic conductor, as well as permanent magnet 2 and the magnetic conductor, are connected by adhesive, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered equivalent (indicated by the "=" sign in the diagram) to the single magnet on the right. The combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2 can be considered as a single magnet component 201.

[0566] The magnetic plate on top can also be replaced with a non-magnetic material, or a magnet with a much weaker magnetic field strength but in the opposite direction. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this type of situation also applies.

[0567] Example 10 of magnet 201:

[0568] Reference Figure 37 As shown; permanent magnets are combined in parallel along the magnetic field direction, with no structural components in between, and n_magnet = 2;

[0569] Permanent magnet 1 and permanent magnet 2 are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0570] Example 11 of magnet component 201:

[0571] Reference Figure 38 As shown; permanent magnets are combined in parallel along the magnetic field direction, with a structural component in between, n_magnetic = 2;

[0572] A magnetic conductor is placed between permanent magnet 1 and permanent magnet 2. Permanent magnet 1 and the magnetic conductor, as well as permanent magnet 2 and the magnetic conductor, are connected by adhesive, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered equivalent (indicated by the "=" sign in the diagram) to the single magnet on the right. The combination of permanent magnet 1, the magnetic conductor, and permanent magnet 2 can be considered as a single magnet component 201.

[0573] The magnetic plate on top can also be replaced with a non-magnetic material, or a magnet with a much weaker magnetic field strength but in the opposite direction. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this type of situation also applies.

[0574] Example 12 of magnet component 201:

[0575] Reference Figure 39 As shown; permanent magnets are combined in parallel along the magnetic field direction, with no structural components in between, and n_magnet = 2;

[0576] Permanent magnet 1 (ring, circular ring, square ring, rectangular ring, etc.) and permanent magnet 2 (cylindrical, cylindrical, square prism, rectangular prism, etc.) are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0577] Example 13 of magnet component 201:

[0578] Reference Figure 40 As shown; permanent magnets are combined in parallel along the magnetic field direction, with a structural component in between, n_magnetic = 2;

[0579] A magnetically conductive ring 104 separates permanent magnet 1 (ring, circular ring, square ring, rectangular ring, etc.) and permanent magnet 2 (cylindrical, cylindrical, square prism, rectangular prism, etc.). Permanent magnet 1 and the magnetically conductive ring, as well as permanent magnet 2 and the magnetically conductive ring, are connected by adhesive, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the combination of permanent magnet 1, the magnetically conductive ring, and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered equivalent (indicated by the "=" sign in the diagram) to the single magnet on the right. The combination of permanent magnet 1, the magnetically conductive ring, and permanent magnet 2 can be considered as a single magnetic component 201.

[0580] The magnetic ring above can also be replaced with a non-magnetic ring, or a reverse magnetic ring with a much weaker magnetic field strength. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this situation also includes this type.

[0581] Example fourteen of magnet component 201:

[0582] Reference Figure 41 As shown; permanent magnets are combined in parallel along the magnetic field direction, with no structural components in between, and n_magnetic = 2;

[0583] Permanent magnet 1 (ring, circular ring, square ring, rectangular ring, etc.) and permanent magnet 2 (ring, cylindrical, square prism, rectangular prism, etc.) are connected by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y+ axis and have the same direction. Therefore, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the figure) to the single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnetic component 201. The core component in the figure can be air, a non-magnetic material, or a weakly magnetic material, such as a weakly magnetic pin.

[0584] Example 15 of magnet component 201:

[0585] Reference Figure 42 As shown; permanent magnets are combined in parallel along the magnetic field direction, with a structural component in between, n_magnetic = 2;

[0586] A magnetically conductive ring 104 separates permanent magnet 1 (ring, circular ring, square ring, rectangular ring, etc.) and permanent magnet 2 (cylindrical, cylindrical, square prism, rectangular prism, etc.). Permanent magnet 1 and the magnetically conductive ring, as well as permanent magnet 2 and the magnetically conductive ring, are connected by adhesive, welding, riveting, pins, clamps, brackets, sleeves, or other methods. The magnetic fields generated by permanent magnet 1 and permanent magnet 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the combination of permanent magnet 1, the magnetically conductive ring, and permanent magnet 2, from the perspective of the overall external magnetic field direction, can be considered equivalent (indicated by the "=" sign in the diagram) to the single magnet on the right. The combination of permanent magnet 1, the magnetically conductive ring, and permanent magnet 2 can be considered as a single magnetic component 201.

[0587] The magnetic connecting ring above can also be replaced with a non-magnetic ring, or a reverse magnetic ring with a much weaker magnetic field strength. This will not affect the overall structure and can still be considered as a single permanent magnet. Therefore, this type of situation also applies.

[0588] Example sixteen of magnet component 201:

[0589] Reference Figure 43 As shown; permanent magnets are combined in series and parallel in the direction of the magnetic field, with no structural components in between, and n_magnet = 5;

[0590] Permanent magnets 1, 2, and 3 are connected in parallel by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other means to form an equivalent magnet (magnet 1|magnet 2|magnet 3). This equivalent magnet (magnet 1|magnet 2|magnet 3) is then connected in series with permanent magnets 4 and 5 to form an equivalent magnet (magnet 4-(magnet 1|magnet 2|magnet 3)-magnet 5). The magnetic fields generated by the equivalent magnet (magnet 1|magnet 2|magnet 3), permanent magnet 4, and permanent magnet 5 are all oriented towards the Y+ axis, hence their directions are the same. Therefore, the magnet assembly (magnet 4-(magnet 1|magnet 2|magnet 3)-magnet 5), from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) a single magnet on the right. The magnet assembly (magnet 4-(magnet 1|magnet 2|magnet 3)-magnet 5) can be considered as a single magnet component 201.

[0591] Example 17 of magnet component 201:

[0592] Reference Figure 44 As shown; permanent magnets are combined in series and parallel in the direction of the magnetic field, with no structural components in between, and n_magnet = 5;

[0593] Permanent magnets 1, 2, and 3 are connected in series by bonding, welding, riveting, pins, clamps, brackets, sleeves, or other means to form an equivalent magnet (Magnet 1-Magnet 2-Magnet 3). This equivalent magnet (Magnet 1-Magnet 2-Magnet 3) is then connected in parallel with permanent magnets 4 and 5 to form an equivalent magnet (Magnet 4|(Magnet 1-Magnet 2-Magnet 3)|Magnet 5). The magnetic fields generated by the equivalent magnet (Magnet 1-Magnet 2-Magnet 3), permanent magnets 4, and permanent magnet 5 are all oriented towards the Y+ axis, hence their directions are the same. Therefore, the magnet combination (Magnet 4|(Magnet 1-Magnet 2-Magnet 3)|Magnet 5), from the perspective of the overall external magnetic field direction, can be considered similar to (indicated by the "=" sign in the diagram) a single magnet on the right. The magnet combination (Magnet 4|(Magnet 1-Magnet 2-Magnet 3)|Magnet 5) can be considered as a single magnet component 201.

[0594] Example 18 of magnet component 201:

[0595] Reference Figure 44a As shown; permanent magnets are connected in series along the magnetic field direction, with no structural components in between, n_magnetic = 2.

[0596] Permanent magnet 1 and permanent magnet 2, with permanent magnet 1 being larger and permanent magnet 2 being smaller, are connected by bonding, welding, embedding, screws, screws, riveting, pins, clips, grippers, brackets, sleeves, caps, or other means. The magnetic field direction of permanent magnet 1 is towards the Y+ axis, and the magnetic field direction of permanent magnet 2 is towards the Y- axis. However, because the magnetic field strength of permanent magnet 2 is less than that of permanent magnet 1, the combination of permanent magnet 1 and permanent magnet 2, from the perspective of the overall external magnetic field direction, can still be considered similar to (indicated by the "=" sign in the figure) to a single magnet on the right. The combination of permanent magnet 1 and permanent magnet 2 can be considered as a single magnet component 201.

[0597] The coil component 102 is used in the following embodiments;

[0598] Embodiment 1 of coil component 102:

[0599] Reference Figure 45 As shown; coils are connected in series in the direction of the magnetic field, with no structural components in between, n turns = 2;

[0600] Coil 1 and coil 2 are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1 and coil 2 can be viewed from the outside as similar to (indicated by the "=" sign in the figure) to the single coil on the right. The combination of coil 1 and coil 2 can be considered as a single coil component 102.

[0601] In the above embodiment, whether or not there is an iron core in the middle of the coil has no effect on the direction of the magnetic field generated by the coil current. Therefore, it does not affect the conclusion that the two coils above are connected in series to form a coil component 102.

[0602] In the diagram below, the coil current is indicated by a circle and a cross icon, following the standard coil current marking method. The circle icon (⊙) indicates that the current flows vertically inwards from the screen, while the dotted icon (⊙) indicates that the current flows vertically outwards from the screen.

[0603] Embodiment 2 of coil component 102:

[0604] Reference Figure 46 As shown; coils are connected in series in the direction of the magnetic field, with a sleeve around the perimeter, n turns = 2;

[0605] Coil 1 and coil 2 are connected by a sleeve (preferably made of a magnetically conductive material, but can also be made of a weakly magnetically conductive material, a non-magnetically conductive material, etc.). The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1 and coil 2 can be viewed from the outside as being similar to (indicated by the "=" sign in the figure) to the single coil on the right. The combination of coil 1 and coil 2 can be considered as a single coil component 102.

[0606] Embodiment 3 of coil component 102:

[0607] Reference Figure 47 As shown; coils are connected in series in the direction of the magnetic field, with no structural components in between, n turns = 3;

[0608] Coil 1, coil 2, and coil 3 are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coils 1, 2, and 3 are all oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coils 1, 2, and 3 can be viewed from the outside as being similar to (indicated by the "=" sign in the diagram) to the single coil on the right. The combination of coils 1, 2, and 3 can be considered as a single coil component 102.

[0609] Embodiment 4 of coil component 102:

[0610] Reference Figure 48 As shown; coils are connected in series in the direction of the magnetic field, with a structural component in the middle, n turns = 2;

[0611] A magnetic conductor is placed between coil 1 and coil 2. Coil 1 and the magnetic ring 104, as well as coil 2 and the magnetic ring 104, are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1, magnetic ring 104, and coil 2, viewed from the outside, can be considered equivalent (indicated by the "=" sign in the figure) to the single coil on the right. The combination of coil 1, magnetic ring 104, and coil 2 can be considered as a single coil component 102.

[0612] The magnetic ring above can also be replaced with a non-magnetic ring, or a coil with a much smaller induced magnetic field strength in the opposite direction. This does not affect the overall structure and can still be considered as a single coil. Therefore, this situation also includes this type.

[0613] Embodiment 5 of coil component 102:

[0614] Reference Figure 49As shown; coils are connected in series in the direction of the magnetic field, with no structural components in between, n turns = 2;

[0615] Coil 1 and coil 2, with coil 1 being larger and coil 2 smaller, are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coils 1 and 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coils 1 and 2 can be viewed externally as equivalent to the single coil on the right (indicated by the "=" sign in the diagram). The combination of coils 1 and 2 can be considered as a single coil component 102.

[0616] Embodiment Six of Coil Component 102:

[0617] Reference Figure 50 As shown; coils are connected in series in the direction of the magnetic field, with a structural component in the middle, n turns = 2;

[0618] Coil 1 and coil 2, with coil 1 being larger and coil 2 smaller, are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coils 1 and 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coils 1 and 2 can be viewed externally as equivalent to the single coil on the right (indicated by the "=" sign in the diagram). The combination of coils 1 and 2 can be considered as a single coil component 102.

[0619] The magnetic ring above can also be replaced with a non-magnetic ring, or a coil with a much smaller induced magnetic field strength in the opposite direction. This does not affect the overall structure and can still be considered as a single coil. Therefore, this situation also includes this type.

[0620] Embodiment 7 of coil component 102:

[0621] Reference Figure 51 As shown; coils are connected in parallel in the direction of the magnetic field, with no structural components in between, n turns = 2;

[0622] Coil 1 (outer coil) and coil 2 (inner coil) are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1 and coil 2 can be viewed from the outside as similar to (indicated by the "=" sign in the diagram) to the single coil on the right. The combination of coil 1 and coil 2 can be considered as a single coil component 102.

[0623] Embodiment 8 of coil component 102:

[0624] Reference Figure 52As shown; coils are connected in parallel in the direction of the magnetic field, with no structural components in between, n turns = 2;

[0625] Coil 1 (outer coil) and coil 2 (inner coil) are connected to the iron core by bonding, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1, coil 2, and the iron core can be viewed from the outside as similar to (indicated by the "=" sign in the diagram) to the single coil on the right. The combination of coil 1, coil 2, and the iron core can be considered as a single coil component 102.

[0626] Embodiment Nine of Coil Component 102:

[0627] Reference Figure 53 As shown; coils are connected in parallel in the direction of the magnetic field, with no structural components in between, n turns = 3;

[0628] Coil 1, coil 2, and coil 3 are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coils 1, 2, and 3 are all oriented towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coils 1, 2, and 3 can be viewed from the outside as being similar to (indicated by the "=" sign in the diagram) to the single coil on the right. The combination of coils 1, 2, and 3 can be considered as a single coil component 102.

[0629] Embodiment 10 of coil component 102:

[0630] Reference Figure 54 As shown; coils and coils are combined in parallel in the direction of the magnetic field, with no structural components in between, n turns = 3;

[0631] Coils 1, 2, and 3, and magnetic plates 1 and 2 are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other means. The magnetic fields generated by coils 1, 2, and 3 are all oriented towards the Y+ axis. The magnetic fields of magnetic plates 1 and 2 after magnetization are also oriented towards the Y+ axis, hence all directions are the same. Therefore, the overall magnetic field generated by the combination of coils 1, 2, and 3, and magnetic plates 1 and 2 can be externally considered equivalent to the single coil on the right (indicated by the "=" sign in the figure). The combination of coils 1, 2, and 3, and magnetic plates 1 and 2 can be considered as a single coil component 102.

[0632] The magnetic plate on top can also be replaced with a non-magnetic plate, or a magnet with a much weaker magnetic field strength but in the opposite direction. This will not affect the overall structure and can still be considered as a single coil. Therefore, this situation also includes this type.

[0633] Example 11 of coil component 102:

[0634] Reference Figure 55 As shown; coils are connected in parallel in the direction of the magnetic field, with a structural component in the middle, n turns = 2;

[0635] A spacer ring (preferably made of a magnetically conductive material, but can also be made of a weakly magnetically conductive material or a non-magnetically conductive material) separates coil 1 and coil 2. Coil 1 and the spacer ring, as well as coil 2 and the spacer ring, are connected by adhesive, brackets, sleeves, riveting, clamps, welding, or other methods. The magnetic fields generated by coil 1 and coil 2 are both oriented towards the Y-axis + direction, hence they are in the same direction. Therefore, the overall magnetic field generated by the combination of coil 1, the spacer ring, and coil 2 can be externally considered equivalent to (indicated by the "=" sign in the figure) to the single coil on the right. The combination of coil 1, the magnetic conductor, and coil 2 can be considered as a single coil component 102.

[0636] Embodiment Twelve of Coil Component 102:

[0637] Reference Figure 56 As shown; coils are combined in series and parallel in the direction of the magnetic field, with no structural components in between, n turns = 4;

[0638] Coil 1 and coil 2 are connected in parallel by bonding, brackets, sleeves, riveting, clamps, welding, or other methods to form an equivalent coil (coil 1|coil 2). This equivalent coil (coil 1|coil 2) is then connected in series with coils 3 and 4 to form an equivalent coil (coil 3-(coil 1|coil 2)-coil 4). The magnetic fields generated by the equivalent coil (coil 1|coil 2), coil 3, and coil 4 are all oriented towards the Y+ axis, hence their directions are the same. Therefore, the overall magnetic field direction generated by the coil combination (coil 3-(coil 1|coil 2)-coil 4) can be externally considered similar to (indicated by the "=" sign in the diagram) to the single coil on the right. The coil combination (coil 3-(coil 1|coil 2)-coil 4) can be considered as a single coil component 102.

[0639] Embodiment Thirteen of Coil Component 102:

[0640] Reference Figure 57 As shown; coils are combined in series and parallel in the direction of the magnetic field, with no structural components in between, n turns = 4;

[0641] Coils 1, 2, and 3 are connected in series using bonding, brackets, sleeves, riveting, clamps, welding, or other methods to form an equivalent coil (coil 1-coil 2-coil 3). This equivalent coil (coil 1-coil 2-coil 3) is then connected in parallel with coil 4 to form an equivalent coil ((coil 1-coil 2-coil 3)|coil 4). The magnetic fields generated by both the equivalent coil (coil 1-coil 2-coil 3) and coil 4 are directed towards the Y+ axis, hence they are in the same direction. Therefore, the overall magnetic field direction generated by the coil combination ((coil 1-coil 2-coil 3)|coil 4) can be externally considered equivalent to (indicated by the "=" sign in the diagram) to the single coil on the right. The coil combination ((coil 1-coil 2-coil 3)|coil 4) can be considered as a single coil component 102.

[0642] Example 12

[0643] Please refer to Figure 1-25 27-53, According to the design method of nonlinear term cancellation of moving coil oscillators in Examples 1, 3, 5, 7 and 9, the nonlinear term cancellation moving coil oscillators obtained by the above design method are applied to bone conduction headphones, bone conduction glasses, wired headphones, wireless headphones, AR glasses, VR glasses, smartwatches, smart bracelets, head-mounted devices, wearable devices, smartphones, game controllers, game headsets, game steering wheels, game pedals, mice, keyboards, touch screens, electrical control panels, touch devices, screen sound devices, in-vehicle haptic feedback devices, smart cockpits, gaming chairs, massage chairs, massagers, haptic feedback vests, haptic feedback gloves, haptic feedback belts, haptic feedback leg devices, hearing aids, sleep aids, or haptic feedback network interconnection devices. When the above-mentioned nonlinear term cancellation moving coil oscillators are used in the above products, they can convert electrical energy into mechanical energy, such as vibration or mechanical motion.

[0644] The foregoing description enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A design method for a moving-coil oscillator with nonlinear term cancellation, characterized in that: Including the following conditions: (1): A moving coil oscillator body is provided. The moving coil oscillator body includes an outer cylinder, a vibration transmission plate, a stator assembly and a moving part assembly. The stator assembly includes a magnet assembly structure and the moving part assembly includes a coil assembly structure. The stator assembly is fixed inside the outer cylinder and the vibration transmission plate is fixed on the outer cylinder. The moving part assembly and the vibration transmission plate are fixedly connected through at least one point. The moving part assembly is called a moving component. (2): The moving part is simultaneously subjected to electromagnetic forces of two pairs of push and pull forces, exhibiting a push-pull structural feature.

2. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: It also includes the following conditions: (3): The moving coil oscillator body is provided with 2N magnetic domains D designed in pairs. 1,i and D 2,i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...

3. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: The number of permanent magnets in the magnet combination structure and the number of coils in the coil combination structure are limited, with the number of permanent magnets being N. 磁 The number of coils is N 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 For 1, 2, 3, ..., 100; N 圈 The range is 1, 2, 3, ..., 100.

4. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: In the push-pull structure, the linear terms of the electromagnetic force on the moving component are superimposed and increase, while the nonlinear terms of the electromagnetic force on the moving component are partially or completely canceled out and decrease.

5. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: In the coil assembly structure, the closed curve of the main magnetic field lines of the coil and in the magnet assembly structure, the closed curve of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,i and D 2,i A magnetic field is a spatial region filled with electromagnetic energy, generally composed of air or a medium with low magnetic permeability (e.g., relative permeability <1000), including the region where the magnetic material is located; and within the magnetic field D... 1,i In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; or in the magnetic domain D 1,i In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,i In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

6. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 5, characterized in that: The moving component is subjected to 2N forces, where N = 1, 2, 3, ..., 100; each force comprises two parts: a linear term of the excitation current i and a nonlinear term of the excitation current i. F 动圈,n (i)=F 动圈,n,linear (i)+F 动圈,n,nonlinear (i), where n = 1, 2, 3, ..., 2N-1, 2N; The resultant force on the moving part also consists of two parts: a linear term of current i and a nonlinear term of current i. F 动圈,合力 (i)=F 动圈,合力,linear (i)+F 动圈,合力,nonlinear (i) in: That is, the nonlinear terms in each component force either partially or completely cancel each other out, resulting in the final total resultant force ∑. i (F 1,i +F 2,i In this process, the total resultant force partially or completely cancels out the nonlinear term of the current, while the linear terms are superimposed and increase, thus obtaining a moving coil oscillator with the nonlinear term canceled out.

7. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: The magnet assembly structure includes a permanent magnet and a first magnetic conductor or a first non-magnetic conductor; the coil assembly structure includes a coil and a second magnetic conductor or a second non-magnetic conductor.

8. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: The magnet assembly structure includes a magnet component and a second magnetic conductor. The magnet component is a single magnet or a combination of multiple magnets (n magnets > 1) whose overall magnetic field is equivalent to that of a single magnet. The magnetic field formed by the magnets in the assembly is in the same direction as a dominant magnetic field (if the magnetic field strengths of the multiple magnets differ significantly, their magnetic field directions may be opposite, but the overall magnetic field direction is the same as the dominant magnetic field direction). Thus, the overall magnetic field generated can be considered as generated by a single magnet component. Typically, the magnets are connected by a rigid or flexible structural component (between magnets, at the edge of magnets, or around magnets), or even without a structural component, by means of bonding, welding, embedding, screws, screws, riveting, pins, buckles, claws, brackets, sleeves, caps, or other methods.

9. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 1, characterized in that: The coil assembly structure includes a coil component and a first magnetic conductor. The coil component is a combination of a single coil or multiple coils (n turns > 1). The overall magnetic field generated is equivalent to the magnetic field generated by a single coil. The magnetic field generated by the coils in the assembly is in the same direction as the magnetic field generated by a dominant coil (if the magnetic field strengths of the multiple coils differ significantly, the directions of the magnetic fields generated by these coils can also be opposite, but the overall magnetic field direction is the same as the direction of the magnetic field generated by the dominant coil). Thus, the overall magnetic field generated can be considered equivalent to the current generated in a single coil component. Typically, the coils are connected by a rigid or flexible structural component (between the coils, at the edge of the coils, or around the coils), or even without a structural component, they are connected by bonding, welding, embedding, screws, screws, riveting, pins, clips, claws, brackets, sleeves, caps, or other means.

10. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 7, characterized in that: The moving part and the stator part are arranged in an interlocking, concave-convex shape, and the closed curve of the main magnetic field line of the coil and the closed curve of the main magnetic field line of the permanent magnet alternately pass through the moving part and the stator part, respectively.

11. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 3, characterized in that: It also includes the following conditions: (3.1): Looking outward from the center, the permanent magnet is inside and the coil is outside; (3.2):N 磁 =(N 圈 +1)*n; n is a natural number, n = 1, 2, 3...; (3.3): When N 磁 When N > 1, the polarity of the two opposite end faces of the permanent magnet is the same; when N 圈 When the value is greater than 1, the current in adjacent coils is in the opposite direction, and the electromagnetic fields of two adjacent coils and their two adjacent end faces have the same polarity.

12. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 3, characterized in that: It also includes the following conditions: (3.1): Looking outward from the center, the permanent magnet is inside and the coil is outside; (3.2):N 磁 =(N 圈 -1)*n; n is a natural number, n = 1, 2, 3...; (3.3): When N 磁 When N > 1, the polarity of the two opposite end faces of the permanent magnet is the same; when N 圈 When the value is greater than 1, the current in adjacent coils is in the opposite direction, and the electromagnetic fields of two adjacent coils and their two adjacent end faces have the same polarity.

13. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 3, characterized in that: It also includes the following conditions: (3.1): Looking outward from the center, the coil is inside and the permanent magnet is outside; (3.2):N 磁 =(N 圈 +1)*n; n is a natural number, n = 1, 2, 3...; (3.3): When N 磁 When N > 1, the polarity of the two opposite end faces of the permanent magnet is the same; when N 圈 When the value is greater than 1, the current in adjacent coils is in the opposite direction, and the electromagnetic fields of two adjacent coils and their two adjacent end faces have the same polarity.

14. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 3, characterized in that: It also includes the following conditions: (3.1): Looking outward from the center, the coil is inside and the permanent magnet is outside; (3.2):N 磁 =(N 圈 -1)*n; n is a natural number, n = 1, 2, 3...; (3.3): N 磁 When the polarity is greater than 1, the polarities of the two opposite end faces of the permanent magnet are the same; N 圈 When the value is greater than 1, the current in adjacent coils is in the opposite direction, and the electromagnetic fields of two adjacent coils and their two adjacent end faces have the same polarity.

15. The design method of the moving-coil oscillator with nonlinear term cancellation according to claim 3, characterized in that: A magnetic conductor is used near the outer cylinder of the coil to minimize the magnetic resistance of the magnetic circuit that forms the electromagnet; the permanent magnets in the magnet assembly are isolated from each other by a magnetic conductor; a yoke is used around the coil and the permanent magnets, or a magnetic outer cylinder is used for the coil assembly and the outer cylinder near the coil.

16. A moving-coil oscillator device for nonlinear term cancellation, employing the design method for a moving-coil oscillator for nonlinear term cancellation as described in claim 12, characterized in that: The device includes a moving-coil oscillator body, comprising an outer cylinder, a transmission plate, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet and a first magnetically conductive body or a first non-magnetically conductive body. The coil assembly structure includes a coil and a second magnetically conductive body or a second non-magnetically conductive body. The magnet assembly structure also includes a magnetic disk and a magnetically conductive ring. Viewed from the center outwards, the coils are on the outside, and the permanent magnet is on the inside. There is one permanent magnet and two coils. The current directions in adjacent coils are opposite, and the electromagnetic field polarities of adjacent coils at their two nearest end faces are the same. The first magnetically conductive body or the first non-magnetically conductive body is fixed to the bottom surface of the outer cylinder, and the permanent magnet is fixed to the first magnetically conductive body or the first non-magnetically conductive body. The guide disk is fixedly mounted on the side, and a vibration transducer is provided. The vibration transducer is fixed on the top surface of the outer cylinder. The vibration transducer is fixedly connected to a vibration transducer bracket, which is L-shaped. The horizontal part of the vibration transducer bracket is parallel to the vibration direction. The second magnetic conductor or the second non-magnetic conductor is fixed in the middle of the horizontal part of the vibration transducer bracket. Two coils are respectively fixed on both sides of the second magnetic conductor or the second non-magnetic conductor. The magnetic ring is fixed on the outside of the two coils. The two coils and the magnetic ring are all fixed on the horizontal part of the vibration transducer bracket. The moving coil assembly and the stator assembly are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil and the closed curve of the main magnetic force line of the permanent magnet alternately pass through the moving coil assembly and the stator assembly. The moving coil oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

17. A moving-coil oscillator device for nonlinear term cancellation, employing the design method of the moving-coil oscillator for nonlinear term cancellation as described in claim 11, characterized in that: The device includes a moving-coil oscillator body, comprising an outer cylinder, a transducer plate, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet and a first magnetically conductive body or a first non-magnetically conductive body. The coil assembly structure includes a coil and a second magnetically conductive body or a second non-magnetically conductive body. The magnet assembly structure also includes a magnetically conductive coil and an I-beam yoke. Viewed from the center outwards, the coil is on the outside, and the permanent magnets are on the inside. There are two permanent magnets, with the polarity of their opposite end faces being the same. There is one coil. The first magnetically conductive body or the first non-magnetically conductive body is fixed to the bottom surface of the outer cylinder. An I-beam yoke is fixed between the two permanent magnets, with one of the permanent magnets fixed to the first magnetically conductive body or the first non-magnetically conductive body. On the magnetic conductor, a magnetic ring is fixed to the outside of another permanent magnet. A vibration transducer is provided, fixed to the top surface of the outer cylinder. A vibration transducer bracket is fixedly connected to the vibration transducer, and the bracket is L-shaped. The horizontal portion of the vibration transducer bracket is parallel to the vibration direction. The coil is fixed in the middle of the horizontal portion of the vibration transducer bracket. A second magnetic conductor or a second non-magnetic conductor is fixed to the outside of the coil, and the second magnetic conductor or the second non-magnetic conductor is fixed to the horizontal portion of the vibration transducer bracket. The moving coil assembly and the stator assembly are arranged in an alternating, interlocking pattern. The closed curve of the main magnetic field lines of the coil and the closed curve of the main magnetic field lines of the permanent magnet alternately pass through the moving coil assembly and the stator assembly, respectively. The moving coil oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,1 and D 2,1 And in the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,1 In this case, the direction of the magnetic field lines of the coil is opposite to the direction of the magnetic field lines of the permanent magnet.

18. A moving-coil oscillator device for nonlinear term cancellation, employing the design method for a moving-coil oscillator for nonlinear term cancellation as described in claim 13, characterized in that: The device includes a moving-coil oscillator body, comprising an outer cylinder, transducer plates, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The magnet assembly structure includes a permanent magnet and a first magnetically conductive body or a first non-magnetically conductive body. The coil assembly structure includes a coil and a second magnetically conductive body or a second non-magnetically conductive body. The magnet assembly structure further includes a first magnetically conductive ring, and the coil assembly structure further includes a second magnetically conductive ring. Viewed from the center outwards, the coil is inside, and the permanent magnet is outside. There is one coil and two permanent magnets. The polarities of the two opposite end faces of the permanent magnets are the same. Two transducer plates are provided, and the two transducer plates are respectively fixed to the top and bottom surfaces of the outer cylinder. The first magnetically conductive body or the first non-magnetically conductive body... Both ends of the magnetic conductor are fixed to the vibration plate. The coil is fixed around the first magnetic conductor or the first non-magnetic conductor. The first magnetic conductor or the first non-magnetic conductor is also provided with a second magnetic ring. The first magnetic conductor or the first non-magnetic conductor is fixed to the inner wall of the outer cylinder. Two permanent magnets are fixed to the outside of the first magnetic conductor or the first non-magnetic conductor. The first magnetic ring is provided on the outside of each permanent magnet. The permanent magnets are fixed to the inner wall of the outer cylinder. The moving part assembly and the stator assembly are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil and the closed curve of the main magnetic force line of the permanent magnet alternately pass through the moving part assembly and the stator assembly. The moving coil oscillator body has two symmetrically designed magnetic domains D inside. 1,1 and D 2,1 The closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively traverse the magnetic domain D. 1,1 D 2,1 In the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

19. A moving-coil oscillator device for nonlinear term cancellation, employing the design method for a moving-coil oscillator for nonlinear term cancellation as described in claim 14, characterized in that: The device includes a moving-coil oscillator body, comprising an outer cylinder, transducer plates, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The coil assembly structure includes a coil and a second magnetic material or a second non-magnetic material. The magnet assembly structure includes a permanent magnet and a first magnetic material or a first non-magnetic material. The coil assembly structure also includes a first magnetic ring and a second magnetic ring. Viewed from the center outwards, the coils are inside, and the permanent magnets are outside. There are two coils; the current directions in adjacent coils are opposite, and the electromagnetic field polarities of the two adjacent end faces of two adjacent coils are the same. Two transducer plates are provided, and the two transducer plates are respectively fixed to the top and bottom surfaces of the outer cylinder. The second magnetic material or the second non-magnetic material... The two ends of the body are respectively fixed to the vibration plate. The two coils are fixed around the second magnetic conductor or the second non-magnetic conductor. The second magnetic conductor or the second non-magnetic conductor is provided with the first magnetic ring. The second magnetic ring is fixed between the two coils. The permanent magnet is fixed in the middle of the inner wall of the outer cylinder. The first magnetic conductor or the first non-magnetic conductor is fixed on both sides of the permanent magnet. The first magnetic conductor or the first non-magnetic conductor is fixed to the inner wall of the outer cylinder. The moving coil assembly and the stator assembly are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil and the closed curve of the main magnetic force line of the permanent magnet alternately pass through the moving coil assembly and the stator assembly. The moving coil oscillator body has four magnetic domains D designed symmetrically in pairs inside. 1,1 D 2,1 D 1,2 D 2,2 Among them, magnetic domain D 1,1 With D 2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetrical, the closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively pass through the magnetic domain D. 1,1 D 2,1 D 1,2 D 2,2 And in the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,1 In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

20. A moving-coil oscillator device for nonlinear term cancellation, employing the design method for a moving-coil oscillator for nonlinear term cancellation as described in claim 13, characterized in that: The device includes a moving-coil oscillator body, comprising an outer cylinder, transducer plates, a stator assembly, and a mover assembly. The stator assembly includes a magnet assembly structure, and the mover assembly includes a coil assembly structure. The coil assembly structure includes a coil and a second magnetic conductor or a second non-magnetic conductor. The magnet assembly structure includes a permanent magnet and a first magnetic conductor or a first non-magnetic conductor. The coil assembly structure also includes a first magnetic ring, a second magnetic ring, and a third magnetic ring. Viewed from the center outwards, the coils are inside, and the permanent magnets are outside. There are two coils, with currents in adjacent coils in opposite directions. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils are the same. There are three permanent magnets, with the polarities of the two opposite end faces of adjacent permanent magnets being the same. Two transducer plates are provided, fixed to the top and bottom surfaces of the outer cylinder, respectively. The second magnetic conductor or the second non-magnetic conductor... Both ends of the magnetic conductor are fixed to the vibration plate. Two coils are fixed around the second magnetic conductor or the second non-magnetic conductor. The second magnetic conductor or the second non-magnetic conductor is provided with the first magnetic ring. The second magnetic ring is fixed between the two coils. Three permanent magnets are fixed sequentially to the inner wall of the outer cylinder. The first magnetic conductor or the first non-magnetic conductor is fixed between adjacent permanent magnets. The third magnetic ring is fixed to the outside of the first magnetic conductor or the first non-magnetic conductor. The first magnetic conductor or the first non-magnetic conductor and the third magnetic ring are fixed to the inner wall of the outer cylinder. The moving coil assembly and the stator assembly are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil and the closed curve of the main magnetic force line of the permanent magnet alternately pass through the moving coil assembly and the stator assembly. The moving coil oscillator body has 6 magnetic domains D designed symmetrically in pairs inside. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 , where magnetic domain D 1,1 With D 2,1 Symmetry, magnetic domain D 1,2 and D 2,2 Symmetry, magnetic domain D 1,3 and D 2,3 Symmetrical, the closed curves of the main magnetic field lines of the coil and the closed curves of the main magnetic field lines of the permanent magnet respectively pass through the magnetic domain D. 1,1 D 2,1 D 1,2 D 2,2 D 1,3 D 2,3 And in the magnetic domain D 1,1 In the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, while in the magnetic domain D... 2,1 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet; in the magnetic domain D 1,2 In the coil, the direction of the magnetic field lines is opposite to the direction of the magnetic field lines of the permanent magnet, while in the magnetic domain D... 2,2 In this configuration, the direction of the magnetic field lines of the coil is the same as the direction of the magnetic field lines of the permanent magnet.

21. The application of the design method for a moving-coil oscillator with nonlinear term cancellation according to any one of claims 1-15, characterized in that: The nonlinear term-canceling moving coil oscillator obtained using the above design method can be applied to bone conduction headphones, bone conduction glasses, wired headphones, wireless headphones, AR glasses, VR glasses, smartwatches, smart bracelets, head-mounted devices, wearable devices, smartphones, game controllers, gaming headsets, gaming steering wheels, gaming pedals, mice, keyboards, touch screens, electrical control panels, touch devices, screen sound devices, in-vehicle haptic feedback devices, smart cockpits, gaming chairs, massage chairs, massagers, haptic feedback vests, haptic feedback gloves, haptic feedback belts, haptic feedback leg devices, hearing aids, sleep aids, or haptic feedback network interconnection devices.

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