Coil magnet parallel push-pull nonlinear offset moving coil magnet single-acting oscillator and application thereof

Abstract

According to the coil magnetic parallel push-pull nonlinear offset moving coil magnetic single-acting vibrator, a moving magnetic coil single-acting vibrator body comprises an outer cylinder, a vibration transmission piece, a stator assembly and a rotor assembly, the stator assembly comprises an iron core combined structure, the rotor assembly comprises a coil magnet combined structure, the stator assembly is fixed to the inner side of the outer cylinder, the vibration transmission piece is fixed to the bottom face of the outer cylinder, and the coil magnet combined structure is fixed to the inner side of the outer cylinder. The mover assembly is fixedly connected with the vibration transmission sheet through at least one site, and the mover assembly is called a moving part; seen from the center to the outside, a permanent magnet in the coil and magnet combined structure is arranged outside, a coil is arranged inside, electromagnetic acting force F1, i and F2 and i on the rotor assembly are opposite in acting force direction in the vibration direction, and therefore resultant force sigma iF1 and i and resultant force sigma iF2 and i are opposite in acting force direction in the vibration direction, the push-pull type design is formed through the combination of push-pull force, and the push-pull type design is achieved. The total resultant force is partially or completely counteracted aiming at nonlinear terms of the current, linear terms are mutually superposed and are increased, and the stiffness coefficient k2 of the vibration transmission sheet is a function of m1, m2 and omega r.

Description

Technical Field

[0001] This invention relates to the field of oscillator technology, specifically to a moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel push-pull nonlinear cancellation and its applications. Background Technology

[0002] Bone conduction headphones often employ moving magnet, moving coil, or balanced armature designs for their vibrators and haptic feedback actuators. These designs limit the mass of the vibrator component. Furthermore, the resonant frequency of the vibrator is inversely proportional to half a power of the vibrator component's mass. Therefore, combining the magnet and coil components as the vibrator increases its mass, resulting in a lower resonant frequency (f0) and ultimately, better low-frequency response.

[0003] Furthermore, existing oscillator and actuator designs using moving magnets, moving coils, or moving irons often exhibit high nonlinear terms due to inherent limitations in the magnet and coil combination design. This means that the electromagnetic force or acceleration experienced by the mover assembly exhibits significant distortion at low or high frequencies, known as total harmonic distortion (THD). Please refer to the appendix for details. Figure 20 The figure shows the distortion curves of a current-designed moving coil assembly or 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, distortion greater than 10% is unacceptable from the standards of audio and haptic feedback. The design of the moving coil oscillator also needs to overcome or reduce this non-linear distortion.

[0004] Furthermore, no one has yet conducted a systematic study on the oscillator using the moving magnetic coil method, revealing the relationship between the stiffness coefficient of the transducer and the target resonant frequency, the magnet assembly, and the coil assembly, so as to provide theoretical guidance on how to design and improve the transducer, magnet assembly, and coil assembly to achieve a certain target resonant frequency.

[0005] Furthermore, no one has yet conducted a systematic study on the oscillator of the moving-coil magnetic method, revealing the relationship between the stiffness coefficient of the transducer and the target resonant frequency, the magnet assembly, and the coil assembly, so as to provide theoretical guidance on how to design and improve the transducer, magnet assembly, and coil assembly to achieve a certain target resonant frequency. Summary of the Invention

[0006] One of the objectives of this invention is to provide a moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel push-pull nonlinear cancellation.

[0007] Another object of the present invention is to provide an application of the above-mentioned parallel coil magnetic push-pull nonlinear cancellation moving coil magnetic single oscillator.

[0008] The technical solution of this invention is: a moving-coil magnetic single-acting oscillator with parallel coil-magnetic push-pull nonlinear cancellation, comprising a moving-coil magnetic single-acting oscillator body, the moving-coil magnetic single-acting oscillator body comprising an outer cylinder, a transmission plate, a stator assembly, and a mover assembly, the stator assembly comprising an iron core assembly structure, the mover assembly comprising a coil-magnet assembly structure, the stator assembly being fixed inside the outer cylinder, the transmission plate being fixed on the bottom surface of the outer cylinder, and the mover assembly being fixedly connected to the transmission plate through at least one point; the mover assembly is referred to as the moving component; viewed from the center outwards, the permanent magnet in the magnet-coil assembly structure is on the outside, the coil is on the inside, and the electromagnetic force F on the mover assembly is... 1，i and F 2，i The forces acting along the direction of vibration are opposite in direction, therefore their resultant forces ∑ i F 1，i and the combined force ∑ i F 2，i The forces acting along the direction of vibration are also opposite in direction. This combination of pushing and pulling forces forms a push-pull design, and in the final resultant force ∑ i (F 1，i +F 2，i In the above, the total resultant force partially or completely cancels out the nonlinear terms of the current, while the linear terms are superimposed and increase. The stiffness coefficient k2 of the vibration transducer is m1, m2, ω. r The function, i.e., k2 = f(m1, m2, ω r ), where m1=m shell +m 铁芯组合结构 m2=m 线圈磁铁组合结构 ω r This is the system's target resonant frequency.

[0009] This invention provides an improved design method, apparatus, and application for a moving-coil magnetic single-acting oscillator with nonlinear term cancellation, which, compared with the prior art, has the following improvements and advantages:

[0010] 1. This invention proposes a method to reduce the nonlinear term of the driving force on the moving coil magnetic component or the nonlinear term of the oscillator coil current in the acceleration of the moving component by means of a paired or unpaired 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.

[0011] 2. The nonlinear term-cancelled moving-coil magnetic single-acting 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 target 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.

[0012] 3. The moving-coil magnetic oscillator of the present invention is subjected to uniform and balanced forces, realizing the overall translational vibration of the oscillator and achieving the best vibration effect.

[0013] 4. Because it reveals the relationship between the spring constant k2 and the target resonant frequency ω r and m 1和 The functional relationship of m2 is used to design the stiffness coefficient of the transducer by inversely using the target resonant frequency, i.e., assuming it to be ω. r By modifying the material and thickness of the vibration transducer, as well as the length and width of the vibration transmission limbs, the final stiffness coefficient value can be made close to the calculated k2. Attached Figure Description

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

[0015] Figure 1 This is a cross-sectional view of Embodiment 2 of the present invention;

[0016] Figure 2 This is a magnetic domain analysis diagram of Embodiment 2 of the present invention;

[0017] Figure 3 This is the closed magnetic field curve of the coil and permanent magnet in Embodiment 2 of the present invention;

[0018] Figure 4 This is a schematic diagram of the oscillator composed of the mover assembly and the vibration plate in Embodiment 2 of the present invention;

[0019] Figure 5 This is a force analysis diagram of the moving part assembly in Embodiment 2 of the present invention;

[0020] Figure 6 This is a force analysis diagram of the stator assembly in Embodiment 2 of the present invention;

[0021] Figure 7 This is a cross-sectional view of Embodiment 3 of the present invention;

[0022] Figure 8 This is a magnetic domain analysis diagram of Embodiment 2 of the present invention;

[0023] Figure 9 This is the closed magnetic field curve of the coil and permanent magnet in Embodiment 3 of the present invention;

[0024] Figure 10 This is a schematic diagram of the oscillator composed of the mover assembly and the vibration plate in Embodiment 3 of the present invention;

[0025] Figure 11 This is a force analysis diagram of the moving part assembly in Embodiment 3 of the present invention;

[0026] Figure 12 This is a force analysis diagram of the stator assembly in Embodiment 3 of the present invention;

[0027] Figure 13 This is a cross-sectional view of Embodiment 3 of the present invention;

[0028] Figure 14 This is a magnetic domain analysis diagram of Embodiment 2 of the present invention;

[0029] Figure 15 This is the closed magnetic field curve of the coil and permanent magnet in Embodiment 3 of the present invention;

[0030] Figure 16 This is a schematic diagram of the oscillator composed of the mover assembly and the vibration plate in Embodiment 3 of the present invention;

[0031] Figure 17 This is a force analysis diagram of the moving part assembly in Embodiment 3 of the present invention;

[0032] Figure 18 This is a force analysis diagram of the stator assembly in Embodiment 3 of the present invention;

[0033] Figure 19 This is a cross-sectional view of Embodiment 4 of the present invention;

[0034] Figure 20 This is a magnetic domain analysis diagram of Embodiment 4 of the present invention;

[0035] Figure 21 This is the closed magnetic field curve of the coil and permanent magnet in Embodiment 4 of the present invention;

[0036] Figure 22 This is a schematic diagram of the oscillator composed of the mover assembly and the vibration plate in Embodiment 4 of the present invention;

[0037] Figure 23 This is a force analysis diagram of the moving part assembly in Embodiment 4 of the present invention;

[0038] Figure 24 This is a force analysis diagram of the stator assembly in Embodiment 4 of the present invention;

[0039] Figure 25 This is a test chart of total harmonic distortion (THD) for existing moving-coil oscillators.

[0040] Figure 26 A schematic diagram of a single-sided (single-transmission oscillator) model;

[0041] Figure 27 A schematic diagram of the force analysis of a single-sided (single-transmission oscillator) model;

[0042] Figure 28 This is the frequency response curve of a single-sided (single-transmission oscillator). Detailed Implementation

[0043] 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.

[0044] Parallel coil-magnetic coil connection: When viewed along the vibration direction of the oscillator, the arrangement of the permanent magnet and the coil is parallel to the vibration direction of the oscillator, and when viewed from the center outward, the permanent magnet is on the outside and the coil is on the inside, which is the parallel coil-magnetic coil connection type.

[0045] 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 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.

[0046] 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.

[0047] Magnetic Domain: The nonlinear term cancellation moving-coil magnetic single-acting oscillator of this invention includes at least one magnetic domain. A magnetic domain refers to a spatial region containing one or more electromagnetic fields, causing interaction forces between components surrounding the magnetic domain. This region is defined as the magnetic domain, or simply the magnetic field. The magnetic domain is the spatial region where magnetic interactions occur. It is generally composed of the spatial region between permanent magnets (generating attractive or repulsive interactions), or the spatial region enclosed by a permanent magnet and a magnetic conductor (generating attractive interactions), or the spatial region enclosed by magnetic conductors (yokes) magnetized by the permanent magnet, or the spatial region within the permanent magnet (the permeability of the hard magnetic material constituting the permanent magnet is close to that of air) where magnetic interactions occur.

[0048] In general, there are two types of magnetic force domains. The first type is the magnetic force domain enclosed by the interior of the mover assembly or the stator assembly; the second type is the magnetic force domain enclosed between the mover assembly and the stator assembly. 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.

[0049] Example 1

[0050] Please refer to Figure 1-28 A parallel-coil push-pull nonlinear canceling moving-coil magnetic single-acting oscillator includes a moving-coil magnetic single-acting oscillator body. The moving-coil magnetic single-acting oscillator body includes an outer cylinder 1, a transmission plate 3, a stator assembly 4, and a mover assembly 5. The stator assembly 4 includes an iron core 41 assembly structure, and the mover assembly 5 includes a permanent magnet 52 magnet assembly structure. The stator assembly 4 is fixed inside the outer cylinder 1, and the transmission plate 3 is fixed on the bottom surface of the outer cylinder 1. The mover assembly 5 and the transmission plate 3 are fixedly connected through at least one point. The mover assembly 5 is referred to as the moving component. Looking outward from the center, the permanent magnet 51 in the permanent magnet 52 magnet assembly structure is on the outside, and the permanent magnet 52 is on the inside. The electromagnetic force F on the mover assembly 5 is... 1，i and F 2，i The forces acting along the direction of vibration are opposite in direction, therefore their resultant forces ∑ i F 1，i and the combined force ∑ i F 2，i The forces acting along the direction of vibration are also opposite in direction. This combination of pushing and pulling forces forms a push-pull design, and in the final resultant force ∑ i (F 1，i +F 2，i In the above, the total resultant force partially or completely cancels out the nonlinear terms of the current, while the linear terms are superimposed and increase. The stiffness coefficient k2 of the vibration transducer 3 is m1, m2, ω. rThe function, i.e., k2 = f(m1, m2, ω r ), where m1=m shell +m 铁芯组合结构， m2=m 线圈磁铁组合结构 ω r This is the system's target resonant frequency.

[0051] Please see the appendix Figure 26-28 Taking a single-sided (single-transmission vibrator 3) oscillator as an example, a single-sided (single-transmission vibrator 3) oscillator has only one single transmission plate on one side in the Z-axis direction. Assume the spring connects to the mover assembly 5. The spring and mover assembly 5 constitute a vibrating subsystem. The mover assembly 5 is connected to the outer cylinder 1 of the oscillator via the spring transmission plate 3.

[0052] Assume the mass of the rotator component 5 is m. r The mass of stator assembly 4 is m. s The spring constant of the spring connected to the moving part assembly 5 is k. s Additionally, assume the mass of the oscillator's outer shell is m. shell =m 外筒sleeve +m 弹簧片spring For the sake of simplicity in formula derivation, we define m² = m r =m 线圈磁铁组合结构 Furthermore, since the stator is fixed to the outer cylinder 1, we define m1 = m shell +m r =m shell +m 铁芯组合结构 .

[0053] For simplicity, assume the damping of the spring is very small, close to zero. Assume the electromagnetic force between the mover assembly 5 (permanent magnet 52) ​​and the stator assembly 4 (magnet) interacts, and the forces acting on the mover assembly 5 and the stator assembly 4 are F and F, respectively. r and F s According to Newton's third law, Fr = -Fs.

[0054] A single-moving-electron system is composed of a single-moving-electron oscillator. The system has only one resonant frequency, and its frequency response curve is as follows: Figure 28 As shown.

[0055] f resonant Abbreviation f r， It is the resonant frequency of the frequency response curve. Frequency f low It is the low-frequency cutoff frequency of the frequency response curve, f. high This is the high-frequency cutoff frequency of the frequency response curve. As can be seen from the graph of the frequency response curve, the resonant frequency f... resonant and f low It is relatively closer. Therefore, in practical systems, the resonant frequency f is optimized through design. resonant To adjust flow .

[0056] Modeling and solving of vibration systems with a single moving oscillator:

[0057] Based on the system modeling above, the dynamic equations of the single-moving oscillator itself can be obtained as follows:

[0058]

[0059] in:

[0060]

[0061]

[0062]

[0063] make

[0064] Where f r It is the electromagnetic interaction force between the moving and stating elements.

[0065] Based on the vibration equation of a single-acting oscillator, its resonant frequency equation can be solved as follows:

[0066] m1m2ω 2 -(m1+m2)k2=0

[0067] Solving for the given information

[0068]

[0069] When the target resonant frequency is known to be ω r =2πf r So, what stiffness coefficient k2 should be selected for the vibrating element 33 to achieve the target resonant frequency?

[0070] The above formula can be used to design the stiffness coefficient of the vibration transducer 33 in reverse order of the target resonant frequency, i.e., assuming the target resonant frequency is ω. r Then the stiffness coefficient of the vibration transducer 3 can be obtained as:

[0071]

[0072] Once the mass of the stator and the mover is determined, the material, thickness, length, and width of the vibration transmission plate 3 are modified to make the final stiffness coefficient value close to the calculated k2, thereby guiding the design of the vibration transmission plate 3.

[0073] If the stiffness coefficient of the vibration transducer 3 is fixed, the target resonant frequency can be achieved by modifying the mass or mass distribution of the stator and mover. In this case, the mass of the stator and mover needs to satisfy the following formula.

[0074]

[0075] The moving coil magnetic single-acting oscillator body 11 includes an outer cylinder 1, a vibration transmission plate 3, a stator assembly 4, and a mover assembly 5. The stator assembly 4 includes an iron core assembly structure, and the mover assembly 5 includes a coil magnet assembly structure. The stator assembly 4 is fixed inside the outer cylinder 1, and the vibration transmission plate 3 is fixed on the bottom surface of the outer cylinder 1. The mover assembly 5 and the vibration transmission plate 3 are fixedly connected through at least one point. The mover assembly 5 is referred to as the moving component.

[0076] The number of permanent magnets 51 and coils 52 in the coil-magnet assembly structure is limited, with the number of permanent magnets 51 being N. 磁 The number of coils 52 is N. 圈 , making N 磁 >N 圈 Or N 磁 <N 圈 N 磁 The numbers are 1, 2, 3, ..., 100; N 圈 The numbers are 1, 2, 3, ..., 100;

[0077] The moving-coil magnetic mono-oscillator body 11 has 2N magnetic domains D arranged in pairs. 1，i and D 2，i N is 1, 2, 3, ..., 100, i = 1, 2, 3, ...;

[0078] The moving component 5 is subjected to the interaction of thrust and pull forces, which causes the linear terms in the component forces of the moving component 5 to be superimposed and increase, while the nonlinear terms in the component forces of the moving component 5 are partially or completely canceled out and decrease.

[0079] When the coil magnet assembly structure uses a first magnetic conductor, the magnetic resistance is low, resulting in better vibration performance. Conversely, when a first non-magnetic conductor is used, the magnetic resistance is high, leading to weaker vibration performance, but it can still be applied in some scenarios. Similarly, when the core assembly structure uses a second magnetic conductor, the magnetic resistance is low, resulting in better vibration performance. Conversely, when a second non-magnetic conductor is used, the magnetic resistance is high, leading to weaker vibration performance, but it can still be applied in some scenarios.

[0080] The vibration transmission plate 3 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 3 is usually fixed on the top surface, bottom surface or middle of the outer cylinder 1.

[0081] The stator assembly 4 is fixed inside the outer cylinder 1, and can be on the inner wall, top surface or bottom surface of the outer cylinder 1;

[0082] The moving part 5 and the vibration transmission plate 3 are fixedly connected through at least one point, which includes point contact and surface contact. There can be one point, two points, or multiple points.

[0083] The closed curves of the main magnetic field lines of the coil 52 and the closed curves of the main magnetic field lines of the permanent magnet 51 respectively cross the magnetic domain D. 1，i and D 2，i And in the magnetic domain D 1，i In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51, while in the magnetic domain D... 2，i In the magnetic field, the direction of the magnetic field lines of the coil 52 is opposite to the direction of the magnetic field lines of the permanent magnet 51; or in the magnetic field domain D 1，i In the magnetic field, the direction of the magnetic field lines of the coil 52 is opposite to that of the permanent magnet 51, while in the magnetic domain D... 2，i In this configuration, the magnetic field lines of the coil 52 are in the same direction as the magnetic field lines of the permanent magnet 51.

[0084] 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.

[0085] F 动圈磁，N (i)=F 动圈磁，N，linear (I)+F 动圈磁，n，nonlinear (i), where N = 1, 2, 3, ..., 2N-1, 2N;

[0086] 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.

[0087] F 动圈磁，合力 (i)=F 动圈磁，合力，linear (i)+F 动圈磁，合力，nonlinear (i)

[0088] in:

[0089]

[0090]

[0091]

[0092] F 动圈磁，合力，nonlinear (i)≡0, meaning the nonlinear terms in each component force cancel each other out to zero, then F 动圈磁，合力 (i)=F 动圈磁，合力，linear(i) means that the resultant force and the excitation current are always linearly related, thus obtaining the moving coil magnetic mono-oscillator with the nonlinear terms canceled out.

[0093] In one of the structures, N 磁 =(N 圈 -1)*n; n is a natural number, n = 1, 2, 3...; when N 磁 When N > 1, the polarities of the two opposite end faces of the adjacent permanent magnet 51 are the same; when N 圈 When the value is greater than 1, the current in adjacent coils 52 is in the opposite direction, and the electromagnetic fields of two adjacent coils 52 and their two adjacent end faces have the same polarity.

[0094] In another structure, N 磁 =(N 圈 +1)*n; n is a natural number, n = 1, 2, 3...; when N 磁 When N > 1, the polarities of the two opposite end faces of the adjacent permanent magnet 51 are the same; when N 圈 When the value is greater than 1, the current in adjacent coils 52 is in the opposite direction, and the electromagnetic fields of two adjacent coils and their two adjacent end faces have the same polarity.

[0095] The moving part 5 and the stator part 4 are arranged in an interlocking, concave-convex shape. The closed curve of the main magnetic field line of the coil 52 and the closed curve of the main magnetic field line of the permanent magnet 51 alternately pass through the moving part 5 and the stator part 4, respectively.

[0096] A magnetic conductor is used near the outer cylinder 1 of the coil 52 to minimize the magnetic resistance of the magnetic circuit formed by the coil 52 as an electromagnet; the permanent magnets 51 are isolated from each other by a magnetic conductor; a yoke is used around the coil 52 and the permanent magnets 51, or a magnetic outer cylinder is used near the outer cylinder 1 of the coil 52.

[0097] Example 2

[0098] Please refer to Figure 1-6A parallel-coil push-pull nonlinear canceling moving-coil magnetic single-acting oscillator includes a moving-coil magnetic single-acting oscillator body 11. The moving-coil magnetic single-acting oscillator body 11 includes an outer cylinder 1, a transmission plate 3, a stator assembly 44, and a mover assembly 55. The stator assembly 4 includes an iron core 41 assembly structure. The mover assembly 5 includes a coil 52 magnet assembly structure. The coil 52 magnet assembly structure includes a coil 52, a permanent magnet 51, and a first magnetic conductor or a first non-magnetic conductor 53. The iron core 41 assembly structure includes an iron core 41 and a second... The magnetic conductor or second non-magnetic conductor 42, the coil 52 magnet assembly structure also includes a magnetic ring 54. Viewed from the center outwards, the coil 52 is inside, the permanent magnet 51 is outside, there is one coil 52, and two permanent magnets 51. The polarities of the two opposite end faces adjacent to the permanent magnets 51 are the same. One vibration transducer 3 is provided, fixed to the bottom surface of the outer cylinder 1. The bottom surface of the inner cylinder 2 is fixed to the middle of the vibration transducer 3. The cross-section of the inner cylinder 2 is U-shaped. The horizontal part of the inner cylinder 2 is connected to the vibration transducer. The moving directions are parallel. The first magnetic or non-magnetic body 53 is fixed in the middle of the horizontal part of the inner cylinder 2. The permanent magnet 51 is fixed on the first magnetic or non-magnetic body 53. The two permanent magnets 51 are respectively fixed on both sides of the first magnetic or non-magnetic body 53. The magnetic ring 54 is fixed on the outside of the two permanent magnets 51. The two permanent magnets 51 and the magnetic ring 54 are all fixed on the horizontal part of the inner cylinder 2. The coil 52 is fixed on the first magnetic... The iron core 41 is fixed to the inner side of the top surface of the outer cylinder 1 on the body or the first non-magnetic body 53. The second magnetic body or the second non-magnetic body 42 is fixed to one end of the iron core 41. The moving coil assembly 5 and the stator assembly 4 are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil 52 and the closed curve of the main magnetic force line of the permanent magnet 51 alternately pass through the moving coil assembly 5 and the stator assembly 4, respectively. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1，1 and D 2，1， D 1，2 and D 2，2 The closed curves of the main magnetic field lines of the coil 52 and the closed curves of the main magnetic field lines of the permanent magnet 51 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 52 is the same as that of the permanent magnet 51, while in the magnetic domain D... 2，1 In this configuration, the direction of the magnetic field lines of the coil 52 is opposite to the direction of the magnetic field lines of the permanent magnet 51.

[0099] The outer cylinder 1 can be a magnetic outer cylinder 1 or a non-magnetic outer cylinder 1. In order to reduce magnetic resistance, a magnetic outer cylinder 1 is preferred. The cross-section of the outer cylinder 1 can be circular, square, or irregular, and can be continuous or discontinuous, such as columnar connection or grid discontinuity.

[0100] To further explain the moving-coil magnetic single-moving oscillator with parallel coil-magnetic parallel push-pull nonlinear 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 5151 and the electromagnet coil 5252 causes the components around the magnetic field to generate an interaction force.

[0101] Figure 4 In the middle, there are four air gaps that form the magnetic field domain D. 1，1 D 2，1 D 1，2 D 2，2 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 51 and the electromagnet coil 52 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 Both are surrounded by stator assembly 4 and mover assembly 5. Therefore, in these magnetic domains, there will be interactive component forces between stator assembly 4 and mover assembly 5.

[0102] Figure 2 and 3 In the circuit, the current through coil C is i, and the corresponding magnetic flux is Φ. i The magnetic fluxes corresponding to permanent magnets M1 and M2 are Φ and Φ, respectively. M1 and Φ M2 .

[0103] 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 ).

[0104] 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

[0105] In magnetic domain D 1，1 In the magnetic field, 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 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 C is the same as the direction of the magnetic field lines corresponding to permanent magnet M2. 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.

[0106] Assume the magnetic flux corresponding to coil C is Φ i And the magnetic flux of magnets M1 and M2 is also the same, i.e., Φ M1 =Φ M2 =Φ m Furthermore, assuming the magnetic field lines of magnet M1 are in the positive direction and the magnetic flux is also positive, then we have:

[0107] Φ D1，1 =Φ M1 -Φ i =Φ m -Φ i

[0108] Φ D2，1 =-Φ M2 -Φ i =-(Φ m +Φ i )

[0109] 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

[0110] In magnetic domain D 1，2 In the middle, only the magnetic field lines corresponding to magnet M1 pass through, therefore the total magnetic flux is only Φ. M1 =Φ m In the magnetic domain D 2，2 In the equation, only the magnetic field lines corresponding to magnet M2 pass through, therefore the total magnetic flux is only Φ. M2 =Φ m .

[0111] Assume that the magnetic reluctance of the magnetic circuit formed by the electromagnetic field generated by the current i in coil C is Z. i Let N be the number of turns in coil C (52 turns), and i be the current intensity. Then we have:

[0112]

[0113] Assume 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 corresponding to permanent magnet 51 can also be expressed using the formula for magnetic induction intensity. Assume the induction intensity at the extreme ends of permanent magnets M1 and M2 is both B. m The area of ​​each magnetic pole end is S m It can be obtained that...

[0116] Therefore,

[0117]

[0118]

[0119] Figure 3 The diagram shows the closed magnetic field lines of coil C, as well as the closed magnetic field lines of magnets M1 and M2. In the diagram, the closed magnetic field lines generated by coil C pass through the magnetic gap D. 1，1 D 2，1 The closed magnetic field lines generated by magnet M1 pass through the magnetic gap D in sequence. 1，1 D 1，2 The closed magnetic field lines generated by magnet M2 pass through the magnetic gap D in sequence. 2，1 D 2，2 .

[0120] Figure 5 This is a schematic diagram of the oscillator subsystem consisting of the mover assembly 5 and the transducer plate 3. Simultaneously, the mover assembly 5 and the magnetic domain D... 1，1 D 2，1 D 1，2 D 2，2 The positional relationships and force analysis of the moving part 5 are also illustrated. In the magnetic domain D... 1，1 The drive assembly 5 is subjected to a leftward suction force F from the stator assembly 4. 1，1 In the magnetic domain D 2，1 The drive assembly 5 is subjected to a rightward suction force F from the stator assembly 4. 2，1 In the magnetic domain D 1，2 The drive assembly 5 is subjected to a rightward suction force F from the stator assembly 4.1，2 In the magnetic domain D 2，2 The drive assembly 5 is subjected to a leftward suction force F from the stator assembly 4. 2，2 .

[0121] 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 leftward direction as positive, the resultant force of the stator assembly 4 on the mover assembly 5 is:

[0122] F 动子组件5 =F1+F2=F 1，1 -F 2，1 -F 1，2 +F 2，2

[0123] F 动子组件5 =F1+F 2＝ (F 1，1 -F 2，1 )+(-F 1，2 +F 2，2 )

[0124] Where F j It corresponds to the magnetic field pair D j =(D 1，j D 2，j The combined force of ).

[0125] As can be seen from the diagram above, for each magnetic domain, D j =(D 1，j D 2，j The two forces, F, experienced by the moving component 5 1，j and F 2，j It has the following characteristics:

[0126] 1)F 1，j and F 2，j The direction of the force is along the Z-axis, which is the direction of vibration.

[0127] 2)F 1，j and F 2，j As vectors, forces have opposite directions. F 1，j When the direction of the force is positive (for example, if we define the right side as positive), F 2，j The direction of the force is exactly negative. The converse is also true, i.e., F... 1，j When the direction of the force is negative, F 2，j The direction of the force is exactly positive.

[0128] 3)F 1，j and F 2，jThe paired nature of the forces, along with their related directions, means that the moving component 5 is simultaneously subjected to a thrust and a pull. This type of force distribution is called a push-pull force structure, and the corresponding design is called a push-pull design.

[0129] 4)F 1，j and F 2，j Appearing in pairs, each F 1，j and F 2，j The resultant force ∑F formed by each 1，j and

[0130] ∑F 2，j Between them, there must be a pushing force and a pulling force, with the resultant force ∑F 1，j and

[0131] ∑F 2，j It is also a push-pull type of force-bearing structure.

[0132] 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 for the moving component 5, is F1 = F 1，1 -F 2，1 And F2 = -F 1，2 +F 2，2 Then, the total resultant force can be calculated.

[0133] 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:

[0134]

[0135] F: Electromagnetic attraction

[0136] B: Magnetic flux density or magnetic induction intensity

[0137] Magnetic flux through a medium

[0138] S: Area of ​​magnetic field lines crossing magnetic poles

[0139] μ0: Air permeability

[0140] 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. m2mThe 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.

[0141] 1)F j， The calculation for j=1 corresponds to the magnetic field pair D. j =(D 1，j D 2，j ), j=1

[0142] 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:

[0143]

[0144] 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:

[0145]

[0146]

[0147] Among them are:

[0148]

[0149]

[0150] because

[0151] F1 = F 1，1 -F 2，1

[0152] Then there is

[0153] F1 = F 1，linear +F 1，nonlinear

[0154]

[0155] 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:

[0156]

[0157]

[0158] because

[0159]

[0160]

[0161] Therefore:

[0162]

[0163] Similarly, calculate F. 1，nonlinear ,

[0164]

[0165] Therefore, D1 = (D 1，1 D 2，1 The resultant force of the component forces is:

[0166]

[0167] 2)F j， The calculation for j=2 corresponds to the magnetic field pair D. j =(D 1，j D 2，j ), j=2

[0168] 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:

[0169]

[0170] 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 =SD2，2 =S D Therefore:

[0171]

[0172] Therefore,

[0173]

[0174] It can be obtained

[0175]

[0176] Because of the net force on the moving part

[0177] F 动子组件 =F1+F2

[0178] F 动子组件 =F 动子组件，linear +F 动子组件，nonlinear

[0179] all:

[0180]

[0181] F 动子组件，nonlinear =F 1，nonlinear +F 2，nonlinear =0+0=0

[0182] From the above derivation process, the following characteristics can be observed:

[0183] 1) In the linear term of the resultant force F 动子组件，linear In the middle, the component force F 1，linear and F 2，linear Each linear term is superimposed, so that the resultant linear term sub-component and the current of coil 52 are still linearly related.

[0184] 2) In the nonlinear term F of the resultant force 动子组件，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 动子组件，nonlinear It is zero.

[0185] We call the above design method a parallel coil-magnetic push-pull nonlinear canceling moving coil magnetic single-acting oscillator. This method can be used not only for designing oscillators but also for designing brakes. The moving coil magnetic oscillator or brake obtained by the above method is also called a parallel coil-magnetic push-pull nonlinear canceling moving coil magnetic single-acting oscillator or brake.

[0186] Please refer to the appendix. Figure 26The figure shows the THD distortion curve of the nonlinear term-cancelled moving-coil magnetic single-acting oscillator designed according to the present invention. As can be seen from the figure, the nonlinear term-cancelled moving-coil magnetic single-acting 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 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 target 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.

[0187] Example 3

[0188] Please refer to Figure 7-12 A moving-coil magnetic single-acting oscillator with nonlinear term cancellation includes a moving-coil magnetic single-acting oscillator body 11. The moving-coil magnetic single-acting oscillator body 11 includes an outer cylinder 1, a transmission plate 3, a stator assembly 44, and a mover assembly 55. The stator assembly 4 includes an iron core 41 assembly structure. The mover assembly 5 includes a coil 52 and a magnet assembly structure. The coil 52 and magnet assembly structure includes a coil 52, a permanent magnet 51, and a first magnetic conductor or a first non-magnetic conductor 53. The iron core 41 assembly structure includes an iron core 41 and a second magnetic conductor or a second non-magnetic conductor 42. Looking outward from the center, the coil 52 is inside, and the permanent magnet 51 is outside. There are two coils 52, and the current in adjacent coils 52 is in opposite directions. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 52 are the same. There is one permanent magnet 51. There is one transmission plate 3. The transmission plate 3 is fixed to the bottom surface of the outer cylinder 1, and the bottom surface of the inner cylinder 2 is fixed. In the middle of the vibration plate 3, the inner cylinder 2 has a U-shaped cross-section. The horizontal part of the inner cylinder 2 is parallel to the vibration direction. The permanent magnet 51 is fixed in the middle of the horizontal part of the inner cylinder 2. The first magnetic conductor or the first non-magnetic conductor 53 is fixed on both sides of the permanent magnet 51. The coil 52 is fixed on the two first magnetic conductors or the first non-magnetic conductors 53. One end of the iron core 41 is fixed on the inner side of the top surface of the outer cylinder 1. The second magnetic conductor or the second non-magnetic conductor 42 is fixed in the middle of the iron core 41. The end of the iron core 41 is also provided with a second magnetic ring 54. The moving coil assembly 5 and the stator assembly 4 are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil 52 and the closed curve of the main magnetic force line of the permanent magnet 51 alternately pass through the moving coil assembly 5 and the stator assembly 4. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1，1 and D 2，1， D 1，2 and D 2，2 The closed curves of the main magnetic field lines of the coil 52 and the closed curves of the main magnetic field lines of the permanent magnet 51 respectively cross the magnetic domain D. 1，1 and D 2，1And in the magnetic domain D 1，1 In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51, while in the magnetic domain D... 2，1 In this configuration, the direction of the magnetic field lines of the coil 52 is opposite to the direction of the magnetic field lines of the permanent magnet 51.

[0189] Figure 10 The four annular air gaps, marked with dense dots and arranged sequentially along the axial direction, are the spatial regions enclosed between the mover assembly 5 and the stator assembly 4. Magnetic lines of force formed by the coil 52 and the permanent magnet 51 pass through these regions. On both sides of these annular air gaps along the Z-axis are yokes of different shapes. According to the principles of electromagnetism, the yokes on both sides of these air gaps through which the magnetic lines of force pass will generate mutually attractive electromagnetic forces; therefore, the regions where these magnetic forces act are called the magnetic field domains.

[0190] Figure 8 In the middle, there are four air gaps that form the magnetic field domain D. 1，1 D 2，1 D 1，2 D 2，2 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 51 and the electromagnet coil 52 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 Both are surrounded by mover assembly 5 and stator assembly 42. Therefore, in these magnetic domains, there will be interactive component forces between mover assembly 5 and stator assembly 42.

[0191] Figure 9 In the diagram, the current through coil C is i1, the current through coil C2 is i2, and the magnetic flux through coil 52 is Φ. i1 and Φ i2 The magnetic flux corresponding to the permanent magnet M1 is Φ. M1 .

[0192] 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 ).

[0193] 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 The magnetic flux;

[0194] In magnetic domain D 1，1 In the magnetic field, 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 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 domain D... 2，1 In the middle, the total magnetic flux is Φ i2 and Φ M1 =Φ m The added value.

[0195] Assume i1 = i2 = i, Φ i1 =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

[0196] Φ D1，1 =Φ M1 -Φ i1 =Φ m -Φ i

[0197] Φ D2，1 =Φ M1 +Φ i2 =Φ m +Φ i

[0198] 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

[0199] In magnetic domain D 1，2 In the middle, only the magnetic field lines corresponding to coil C 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 .

[0200] Assume that the magnetic reluctance of the magnetic circuit formed by the electromagnetic field generated by the current i in coils C and C2 is Z. i Let N be the number of turns of coils C and C2, and i be the current intensity. Then we have:

[0201]

[0202] Assume the permeability of the magnetic circuit formed by the electromagnetic field generated by the current is G. i Then we have:

[0203]

[0204] The magnetic flux corresponding to permanent magnet 51 can also be expressed using the formula for magnetic induction intensity. Assume the magnetic induction intensities at the magnetic end faces of permanent magnet M1 are B... m The area of ​​the magnetic pole end is S. m It can be obtained that...

[0205] Therefore,

[0206]

[0207]

[0208] Figure 9 The diagram shows the closed magnetic field lines of coils C and C2, as well as the closed magnetic field line of magnet M1. In the diagram, the closed magnetic field lines generated by coil C 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 .

[0209] Figure 11 This is a schematic diagram of the oscillator subsystem consisting of the mover assembly 5 and the spring plates in the transmission plate 3. Simultaneously, the mover assembly 5 and the magnetic domain D... 1，1 D 2，1 D 1，2 D 2，2 The positional relationships and the force analysis of stator assembly 4 are also illustrated. In the magnetic domain D... 1，1 The drive assembly 5 is subjected to a rightward suction force F from the stator assembly 4. 1，1 In the magnetic domain D 2，1 The middle moving part 5 is subjected to a leftward suction force F from the moving part 5. 2，1 In the magnetic domain D 1，2 The drive assembly 5 is subjected to a leftward suction force F from the stator assembly 4. 1，2 In the magnetic domain D2，2 The drive assembly 5 is subjected to a rightward suction force F from the stator assembly 4. 2，2 .

[0210] 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 leftward direction as positive, the resultant force of the stator assembly 4 on the mover assembly 5 is:

[0211] F 动子组件 =F1+F2=-F 1，1 +F 2，1 +F 1，2 -F 2，2

[0212] F 动子组件 =F1+F 2＝ (-F 1，1 +F 2，1 )+(F 1，2 -F 2，2 )

[0213] Where F j It corresponds to the magnetic field pair D j =(D 1，j D 2，j The combined force of ).

[0214] from Figure 11-12 It can also be seen that, for each magnetic domain, D j =(D 1，j D 2，j The two forces, F, experienced by the moving component 5 1，j and F 2，j It has the following characteristics:

[0215] 1)F 1，j and F 2，j The direction of the force is along the Z-axis, which is the direction of vibration.

[0216] 2)F 1，j and F 2，j As vectors, forces have opposite directions. F 1，j When the direction of the force is positive (for example, if we define the right side as positive), F 2，j The direction of the force is exactly negative. The converse is also true, i.e., F... 1，j When the direction of the force is negative, F 2，j The direction of the force is exactly positive.

[0217] 3)F 1，j and F 2，jThe paired nature of the forces, along with their related directions, means that the moving component 5 is simultaneously subjected to a thrust and a pull. This type of force distribution is called a push-pull force structure, and the corresponding design is called a push-pull design.

[0218] 4)F 1，j and F 2，j Appearing in pairs, each F 1，j and F 2，j The resultant force ∑F formed by each 1，j and ∑F 2，j Between them, there must be a pushing force and a pulling force, with the resultant force ∑F 1，j and ∑F 2，j It is also a push-pull type of force-bearing structure.

[0219] 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 for the moving part 5, is F1 = -F 1，1 +F 2，1 and F2 = F 1，2 -F 2，2 Then, the total resultant force can be calculated.

[0220] 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:

[0221]

[0222] F: Electromagnetic attraction

[0223] B: Magnetic flux density or magnetic induction intensity

[0224] Magnetic flux through a medium

[0225] S: Area of ​​magnetic field lines crossing magnetic poles

[0226] μ0: Air permeability

[0227] 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 two permanent magnets 51, 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 51 and the conductive magnet (yoke) is..., then C... m2yThe 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.

[0228] 1)F j， The calculation for j=1 corresponds to the magnetic field pair D. j =(D 1，j D 2，j ), j=1

[0229] 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:

[0230]

[0231] 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:

[0232]

[0233]

[0234] Among them are:

[0235]

[0236]

[0237] because

[0238] F1 = -F 1，1 +F 2，1

[0239] Then there is

[0240] F1 = F 1，linear +F 1，nonlinear

[0241]

[0242] F 1，1，linear F2，1，linear F 1，1，nonlinear F 1，1，nonlinear Substitute F respectively 1，linear and F 1，nonlinear The calculations are as follows:

[0243]

[0244] because

[0245]

[0246]

[0247] Therefore:

[0248]

[0249] Similarly, calculate F. 1，nonlinear ,

[0250]

[0251] Therefore, D1 = (D 1，1 D 2，1 The resultant force of the component forces is:

[0252]

[0253] 2)F j The calculation for j=2 corresponds to the magnetic field pair D. j =(D 1，j D 2，j ), j=2

[0254] 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:

[0255]

[0256] 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 D Therefore:

[0257]

[0258] Therefore,

[0259]

[0260] It can be obtained

[0261]

[0262] Because of the net force on the moving part

[0263] F 动子组件 =F1+F2

[0264] F 动子组件 =F 动子组件，linear +F 动子组件，nonlinear

[0265] all:

[0266]

[0267] F 动子组件，nonlinear =F 1，nonlinear +F 2，nonlinear =0+0=0

[0268] From the above derivation process, the following characteristics can be observed:

[0269] 1) In the linear term of the resultant force F 动子组件，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. 动子组件，linear The current in coil 52 remains linearly related to the current in coil 52.

[0270] 2) In the nonlinear term F of the resultant force 动子组件，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 动子组件，nonlinear It is zero.

[0271] Example 4

[0272] Please refer to Figure 13-18A moving-coil magnetic single-acting oscillator with nonlinear term cancellation includes a moving-coil magnetic single-acting oscillator body 11. The moving-coil magnetic single-acting oscillator body 11 includes an outer cylinder 1, a transmission plate 3, a stator assembly 44, and a mover assembly 55. The stator assembly 4 includes an iron core 41 assembly structure. The mover assembly 5 includes a coil 52 and a magnet assembly structure. The coil 52 and magnet assembly structure includes a coil 52, a permanent magnet 51, and a first magnetic conductor or a first non-magnetic conductor 53. The iron core 41 assembly structure includes an iron core 41 and a second magnetic conductor or a second non-magnetic conductor 42. Looking outward from the center, the coil 52 is inside and the permanent magnet 51 is outside. There are two coils 52, and the polarities of the two opposite end faces of adjacent permanent magnets 51 are the same. There are three permanent magnets 51, and the current directions in adjacent coils 52 are opposite. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 52 are the same. There is one transmission plate 3, which is fixed to the outer cylinder 1. On the bottom surface, the bottom surface of the inner cylinder 2 is fixed to the middle of the vibration plate 3. The cross-section of the inner cylinder 2 is U-shaped. The horizontal part of the inner cylinder 2 is parallel to the vibration direction. Three permanent magnets 51 are fixed on the horizontal part of the inner cylinder 2. A first magnetic conductor or a first non-magnetic conductor 53 is provided between adjacent permanent magnets 51. A first magnetic ring 54 is provided on the outside of the permanent magnet 51. Two coils 52 are respectively fixed on the first magnetic conductor or the first non-magnetic conductor 53. One end of the iron core 41 is fixed on the inner side of the top surface of the outer cylinder 1. The second magnetic conductor or the second non-magnetic conductor 42 is fixed on one end of the iron core 41. The moving coil assembly 5 and the stator assembly 4 are arranged in an alternating concave-convex interlocking shape. The closed curve of the main magnetic force line of the coil 52 and the closed curve of the main magnetic force line of the permanent magnet 51 alternately pass through the moving coil assembly 5 and the stator assembly 4. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1，1 and D 2，1 D 1，2 and D 2，2 The closed curves of the main magnetic field lines of the coil 52 and the closed curves of the main magnetic field lines of the permanent magnet 51 respectively cross the magnetic domain D. 1，1 D 2，1 D 1，2 and D 2，2 In the magnetic domain D 1，1 In the magnetic field, the direction of the magnetic field lines of the coil 52 is opposite to that of the permanent magnet 51, while in the magnetic domain D... 2，1 In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51; in the magnetic domain D 1，2 In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51, while in the magnetic domain D... 2，2 In this configuration, the direction of the magnetic field lines of the coil 52 is opposite to the direction of the magnetic field lines of the permanent magnet 51.

[0273] Example 5

[0274] Please refer to Figure 19-24 A moving-coil magnetic single-acting oscillator with nonlinear term cancellation includes a moving-coil magnetic single-acting oscillator body 11. The moving-coil magnetic single-acting oscillator body 11 includes an outer cylinder 1, a transmission plate 3, a stator assembly 44, and a mover assembly 55. The stator assembly 4 includes an iron core 41 assembly structure. The mover assembly 5 includes a coil 52 magnet assembly structure. The coil 52 magnet assembly structure includes a coil 52, a permanent magnet 51, and a first magnetic conductor or a first non-magnetic conductor 53. The iron core 41 assembly structure includes an iron core 41 and a second magnetic conductor or a second non-magnetic conductor 42. The coil 52 magnet assembly structure also includes a magnetic ring 54. Viewed from the center outwards, the coils 52 are inside, and the permanent magnets 51 are outside. There are three coils 52, and the current directions in adjacent coils 52 are opposite. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils 52 are the same. There are two permanent magnets 51, and the polarities of the two opposite end faces of adjacent permanent magnets 51 are opposite. Similarly, the vibration plate 3 is provided and fixed to the bottom surface of the outer cylinder 1. The bottom surface of the inner cylinder 2 is fixed to the middle of the vibration plate 3. The cross-section of the inner cylinder 2 is U-shaped, and the horizontal part of the inner cylinder 2 is parallel to the vibration direction. Two permanent magnets 51 are fixed on the horizontal part of the inner cylinder 2. A first magnetic conductor or a first non-magnetic conductor 53 is fixed between the two permanent magnets 51. A first magnetic ring 54 is provided on the outside of the coil 52. The coil 52 is fixed on the first magnetic ring 54 and the two first magnetic conductors or the first non-magnetic conductors 53 respectively. One end of the iron core 41 is fixed on the inner side of the top surface of the outer cylinder 1. The second magnetic conductor or the second non-magnetic conductor 42 is fixed in the middle of the iron core 41. A second magnetic ring 54 is also provided at the end of the iron core 41. The moving part assembly 5 and the stator assembly 4 are arranged in an interlocking shape with concave and convex shapes. The main magnetic lines of force of the coil 52 are closed curves. and The closed curves of the main magnetic field lines of the permanent magnet 51 alternately pass through the moving element assembly 5 and the stator assembly 4, respectively. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1，1 and D 2，1， D 1，2 and D 2，2 The closed curves of the main magnetic field lines of the coil 52 and the closed curves of the main magnetic field lines of the permanent magnet 51 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 52 is opposite to that of the permanent magnet 51, while in the magnetic domain D... 2，1 In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51, in the magnetic domain D 1，2In the magnetic field, the direction of the magnetic field lines of the coil 52 is the same as that of the permanent magnet 51, while in the magnetic domain D... 2，2 In this configuration, the direction of the magnetic field lines of the coil 52 is opposite to the direction of the magnetic field lines of the permanent magnet 51.

[0275] Example 6

[0276] Please refer to Figure 1-28 According to the application of the parallel-type push-pull nonlinear canceling moving-coil magnetic single-acting oscillator of Example 1, the nonlinear canceling moving-coil magnetic single-acting oscillator obtained by 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, 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 canceling moving-coil magnetic single-acting oscillator is used in the above products, it can convert electrical energy into mechanical energy, such as vibration or mechanical motion.

Claims

1. A moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel-type push-pull nonlinear cancellation, characterized in that: The device includes a moving-coil magnetic single-acting oscillator body, comprising an outer cylinder, a transmission plate, a stator assembly, and a mover assembly. The stator assembly includes an iron core assembly, and the mover assembly includes a coil-magnet assembly. The stator assembly is fixed inside the outer cylinder, and the transmission plate is fixed to the bottom surface of the outer cylinder. The mover assembly and the transmission plate are fixedly connected through at least one point. The mover assembly is referred to as the moving component. Looking outward from the center, the permanent magnet in the magnet-coil assembly is on the outside, and the coil is on the inside. The electromagnetic force F exerted on the mover assembly is... 1,i and F 2,i The forces acting along the direction of vibration are opposite in direction, therefore their resultant forces ∑ i F 1,i and the combined force ∑ i F 2,i The forces acting along the direction of vibration are also opposite in direction. This combination of pushing and pulling forces forms a push-pull design, and in the final resultant force ∑ i (F 1,i +F 2,i In the above, the total resultant force partially or completely cancels out the nonlinear terms of the current, while the linear terms are superimposed and increase. The stiffness coefficient k2 of the vibration transducer is m1, m2, ω. r The function, i.e., k2=f(m1,m2,ω r ), where m1=m shell +m 铁芯组合结构 m2=m 线圈磁铁组合结构 ω r This is the system's target resonant frequency.

2. The moving-coil magnetic monodynamic oscillator with parallel magnetic coil push-pull nonlinear cancellation according to claim 1, characterized in that: Modeling and solving vibration systems with a single-moving oscillator. Based on the system modeling above, the dynamic equations of the single-moving oscillator itself can be obtained as follows: in: make Where f r It is the electromagnetic interaction force between the moving and stating elements; Based on the vibration equation of a single-acting oscillator, its resonant frequency equation can be solved as follows: m1m2ω 2 -(m1+m2)k2=0 Solving for the given information Right now, 3. The moving-coil magnetic single-acting oscillator with parallel coil magnetic push-pull nonlinear cancellation according to claim 1, characterized in that: 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,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 (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.

4. The moving magnetic coil single-moving oscillator with parallel magnetic coil push-pull nonlinear cancellation according to claim 3, characterized in that: The coil magnet assembly structure contains N permanent magnets and coils, 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 values ​​are 1, 2, 3, ..., 100; the moving-coil magnetic single-acting oscillator body 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, ...

5. The moving magnetic coil single-moving oscillator with parallel magnetic coil push-pull nonlinear cancellation according to claim 4, characterized in that: 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,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 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 moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation as described in 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 动圈磁,n (i)=F 动圈磁,n,linear (i)+F 动圈磁,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 动圈磁,合力 (i)=F 动圈磁,合力,linear (i)+F 动圈磁,合力,nonlineat (i) in: F 动圈磁,合力,nonlinear (i)≡0, meaning the nonlinear terms in each component force cancel each other out to zero, then F 动圈磁,合力 (i)=F 动圈磁,合力,linear (i) means that the resultant force and the excitation current are always linearly related, thus obtaining the moving coil magnetic mono-oscillator with the nonlinear terms canceled out.

7. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation as described in claim 6, characterized in that: The coil-magnet assembly structure includes a coil, a permanent magnet, and a first magnetic conductor or a first non-magnetic conductor; the iron core assembly structure includes an iron core and a second magnetic conductor or a second non-magnetic conductor.

8. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation as described in claim 7, characterized in that: The moving part assembly and the stator assembly are arranged in an alternating, interlocking pattern, and the closed curves of the main magnetic field lines of the coil and the main magnetic field lines of the permanent magnet alternately pass through the moving part assembly and the stator assembly, respectively.

9. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation according to claim 8, characterized in that: N 磁 =(N 圈 +1)*n; n is a natural number, n = 1, 2, 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.

10. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation according to claim 8, characterized in that: N 磁 =(N 圈 -1)*n; n is a natural number, n = 1, 2, 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.

11. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation according to claim 8, characterized in that: A magnetic conductor is used near the outer cylinder of the coil to minimize the magnetic resistance of the magnetic circuit of the electromagnet formed by the coil; the permanent magnets 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 near the outer cylinder of the coil.

12. The moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel connection and nonlinear cancellation according to claim 8, characterized in that: The coil-magnet assembly structure also includes a magnetic 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 adjacent permanent magnets are the same. One vibration transducer is provided and fixed to the bottom surface of the outer cylinder. The bottom surface of the inner cylinder is fixed to the middle of the vibration transducer. The cross-section of the inner cylinder is U-shaped, and the horizontal portion of the inner cylinder is parallel to the vibration direction. The first magnetically conductive body or the first non-magnetically conductive body is fixed in the middle of the horizontal portion of the inner cylinder. The permanent magnets are fixed to the first magnetically conductive body or the first non-magnetically conductive body. The two permanent magnets are respectively fixed to the first magnetically conductive body or the first non-magnetically conductive body. On both sides of the non-magnetic body, magnetic rings are fixed to the outer sides of the two permanent magnets. The two permanent magnets and the magnetic rings are fixed to the horizontal part of the inner cylinder. The coil is fixed to the first magnetic body or the first non-magnetic body. One end of the iron core is fixed to the inner side of the top surface of the outer cylinder. The second magnetic body or the second non-magnetic body is fixed to one end of the iron core. The moving part assembly and the stator assembly are arranged in an alternating, interlocking shape. 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 part assembly and the stator assembly, respectively. The moving coil magnetic single-moving oscillator body has four paired magnetic domains D inside. 1,1 and D 2,1， D 1,2 and D 2,2 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.

13. The moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel connection and push-pull nonlinear cancellation according to claim 10, characterized in that: The coil consists of two coils, with currents flowing in opposite directions in adjacent coils. The electromagnetic fields at the two nearest end faces of two adjacent coils have the same polarity. There is one permanent magnet and one vibration transducer fixed to the bottom surface of the outer cylinder. The bottom surface of the inner cylinder is fixed to the middle of the vibration transducer. The inner cylinder has a U-shaped cross-section, with its horizontal section parallel to the vibration direction. The permanent magnet is fixed to the middle of the horizontal section of the inner cylinder. Two first magnetic conductors or first non-magnetic conductors are fixed to either side of the permanent magnet. The coil is fixed on the body or the first non-magnetic body respectively. One end of the iron core is fixed on the inner side of the top surface of the outer cylinder. The second magnetic body or the second non-magnetic body is fixed in the middle of the iron core. The end of the iron core is also provided with a second magnetic ring. 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 respectively. The moving coil magnetic single-moving oscillator body has 4 magnetic domains D designed in pairs inside. 1,1 and D 2,1， D 1,2 and D 2,2 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.

14. The moving-coil magnetic single-acting oscillator with parallel coil magnetic coupling and push-pull nonlinear cancellation according to claim 9, characterized in that: The system comprises two coils, with the polarities of opposite end faces of adjacent permanent magnets being the same. There are three permanent magnets, with the current directions of adjacent coils being opposite. The electromagnetic field polarities of adjacent end faces of two adjacent coils are the same. A vibration transducer is provided, fixed to the bottom surface of the outer cylinder. The bottom surface of the inner cylinder is fixed to the middle of the vibration transducer. The cross-section of the inner cylinder is U-shaped, with its horizontal portion parallel to the vibration direction. Three permanent magnets are fixed to the horizontal portion of the inner cylinder. A first magnetic conductor or a first non-magnetic conductor is provided between adjacent permanent magnets. The body includes a first magnetic ring on the outside of the permanent magnet, two coils fixed to the first magnetic ring or a first non-magnetic ring respectively, one end of the iron core fixed to the inner side of the top surface of the outer cylinder, and a second magnetic ring or a second non-magnetic ring fixed to one end of the iron core. The moving coil assembly and the stator assembly are arranged in an alternating, interlocking shape. The closed curves of the main magnetic lines of force of the coils and the closed curves of the main magnetic lines of force of the permanent magnet alternately pass through the moving coil assembly and the stator assembly respectively. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1,1 and D 2,1 D 1,2 and D 2,2 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 D 1,2 and D 2,2 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 the coil, the direction of the magnetic field lines is the same as that of the permanent magnet; in the magnetic domain D 1,2 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... 2,2 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.

15. The moving-coil magnetic single-acting oscillator with parallel coil-magnetic parallel connection and push-pull nonlinear cancellation according to claim 10, characterized in that: The coil-magnet assembly structure also includes a magnetic ring. Viewed from the center outwards, the coils are inside, and the permanent magnets are outside. There are three coils, with currents in adjacent coils flowing in opposite directions. The electromagnetic field polarities of the two adjacent end faces of two adjacent coils are the same. There are two permanent magnets, with the polarities of the two opposite end faces of adjacent permanent magnets being the same. One vibration transducer is provided and fixed to the bottom surface of the outer cylinder. The bottom surface of the inner cylinder is fixed to the middle of the vibration transducer. The cross-section of the inner cylinder is U-shaped, and the horizontal portion of the inner cylinder is parallel to the vibration direction. Two permanent magnets are fixed to the horizontal portion of the inner cylinder, and the first magnetic ring is fixed between the two permanent magnets. The coil has a first magnetic ring on its outer side, and the coil is fixed on the first magnetic ring and two first magnetic bodies or first non-magnetic bodies respectively. One end of the iron core is fixed to the inner side of the top surface of the outer cylinder. The second magnetic body or second non-magnetic body is fixed to the middle of the iron core. The end of the iron core is also provided with a second magnetic ring. 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 respectively. The moving coil magnetic single-moving oscillator body has four magnetic domains D designed in pairs inside. 1,1 and D 2,1 D 1,2 and D 2,2 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 the coil, the direction of the magnetic field lines is the same as that of the permanent magnet, in the magnetic domain D 1,2 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... 2,2 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.

16. The application of the parallel-coil push-pull nonlinear cancelling moving-coil magnetic single-acting oscillator according to any one of claims 1-15, characterized in that: Applications include 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 foot pedals, mice, keyboards, touchscreens, 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.

Images