Magnetic gear permanent magnet memory motor of magnetic field modulation type

Abstract

The utility model discloses a kind of magnetic gear permanent-magnet memory motor of magnetic field modulation type, it is related to motor technical field, from inside to outside sequentially include inner rotor, outer rotor, and stator, wherein, stator includes stator yoke, stator yoke is provided with stator tooth between outer rotor, stator slot is formed between two adjacent stator teeth, and each stator slot embeds armature winding;Outer rotor includes outer rotor core, and the outer end of outer rotor core includes multiple V type structures, V type structure is magnetic pole assembly, and multiple magnetic pole assemblies are evenly arranged in circumferential direction;Gap between outer rotor and inner rotor is equipped with magnetic adjustment block. Realized the effect that magnetic flux is safely regulated and controlled when fault, significantly reduce leakage magnetic, inner rotor large torque output under small current input.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a magnetic field modulation type magnetic gear permanent magnet memory motor. Background Technology

[0002] Magnetic gears utilize magnetic force for transmission, a type of transmission device that transmits torque through magnetic coupling. Based on the principle of magnetic field modulation, a novel coaxial magnetic gear involves all permanent magnets in the torque transmission process, effectively improving the utilization rate of the permanent magnets. Simultaneously, the stator armature magnetic field replaces the high-speed permanent magnet rotor magnetic field, forming a single layer of surface-mounted permanent magnets. Its performance not only meets the requirements of low-speed, high-torque direct drive of the rotor but also reduces manufacturing costs, making it applicable in industrial fields such as mining, industrial robotics, wind power generation, and new energy electric vehicles. It is suitable not only for low-power applications, such as drive motors for new energy vehicles, but also for high-power industrial and military applications, such as water turbines and cruise ships. In industrial applications, the precise peak torque transmission capability and inherent overload protection of magnetic gears meet the basic requirements of machine tool manufacturing.

[0003] Researchers from multiple countries have been dedicated to structural innovation and performance improvement of magnetic gear technology. In 2007, inspired by magnetic field-modulated magnetic gears, KT Chau, a scholar at the University of Hong Kong, first proposed the concept of combining magnetic gears with permanent magnet brushless motors, laying the initial theoretical foundation for the development of this type of motor. In 2009, Professor Shen Jianxin of Zhejiang University made significant improvements to the structure of this type of motor, designing an external rotor type magnetic gear permanent magnet brushless motor. Its innovation lies in the structural integration of the magnetic gear and the motor body. Through integrated design, the external rotor of the traditional permanent magnet motor and the high-speed rotor of the magnetic gear are eliminated, which not only simplifies the overall structure but also improves the system integration. In 2011, Professor Wang J. of the University of Sheffield in the UK proposed an internal rotor type permanent magnet gear brushless motor. This structure arranges the magnetic gear inside the motor rotor, has three rotor components, and achieves stepless speed regulation, thereby expanding the potential application range of the motor. In 2019, Professor Fang Shuhua of Southeast University made new progress in magnetic field modulation technology, proposing a dual-stator magnetic field modulation motor. Through different pole pair numbers and modulation tooth combinations, four specific configurations were developed, effectively optimizing the magnetic field modulation effect and the overall performance of the motor. However, existing magnetic gear composite motors still face three major challenges. First, their torque density is generally lower than the 250 N·m / L level of conventional commercial mechanical gearboxes, limiting their application potential in high-requirement fields such as aerospace. Second, the motor structure is relatively complex, with high magnetic field harmonic content, leading to increased iron losses, severe heat generation, and difficulty in heat dissipation, thus affecting the reliability and service life of the motor. Finally, due to the use of the magnetic field modulation principle, a large number of non-working harmonic magnetic fields exist in the air gap, resulting in high non-working magnetic flux density and rapid frequency changes in the iron core, causing significant eddy current and hysteresis losses, thereby reducing system operating efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a magnetic field modulation type magnetic gear permanent magnet memory motor. Structurally, through the design of increasing and decreasing magnetization of the outer rotor permanent magnet, the innovative structure of the memory motor combined with the magnetic gear, and the introduction of torque winding to sort the magnetic flux, the magnetic flux is safely regulated during faults, the leakage flux is significantly reduced, and the inner rotor has a large torque output under small current input. At the same time, the thermal management adaptability and the motor operation safety are improved.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] According to the present invention, a magnetic field-modulated permanent magnet gear memory motor comprises, from the inside out, an inner rotor, an outer rotor, and a stator, wherein...

[0007] The stator includes a stator yoke, stator teeth are provided between the stator yoke and the outer rotor, and stator slots are formed between two adjacent stator teeth, with armature windings embedded in each stator slot;

[0008] The outer rotor includes an outer rotor core, and the outer end of the outer rotor core includes multiple V-shaped structures. The V-shaped structures are magnetic pole assemblies, and the multiple magnetic pole assemblies are evenly arranged circumferentially.

[0009] A magnetic adjustment block is provided in the gap between the outer rotor and the inner rotor.

[0010] As a further optimization of the magnetic field modulation type permanent magnet memory motor of the present invention, when facing the opening of the V-shaped structure, the right component of the V-shaped structure is a first permanent magnet with different magnetic circuits, and the left component is a second permanent magnet with parallel magnetic circuits. The first permanent magnet and the second permanent magnet form an angle with the opening facing outward.

[0011] As a further optimization of the magnetic field modulation type permanent magnet memory motor of this utility model, the gap between the outer rotor and the inner rotor is an air gap with a thickness of 1mm.

[0012] As a further optimization of the magnetic field modulation type permanent magnet memory motor of this utility model, the armature winding is distributed in a 6° circumferential direction.

[0013] As a further optimization scheme for the magnetic field modulation type permanent magnet memory motor of the present invention, each pair of armature windings is a phase, with a total of 15 groups and a phase difference of 24°.

[0014] As a further optimization of the magnetic field modulation type permanent magnet memory motor of the present invention, the armature winding is six-phase, and the first permanent magnet is radially magnetized after the armature winding is energized.

[0015] As a further optimization of the magnetic field modulation type permanent magnet memory motor of this utility model, the outer rotor end is composed of multiple layers of silicon steel sheets, and the stator exterior is composed of multiple layers of outer silicon steel sheets.

[0016] As a further optimization of the magnetic field modulation type permanent magnet memory motor of the present invention, a third permanent magnet is embedded inside the outer rotor, and the inner rotor includes a central rotating shaft, an inner rotor core surrounding the rotating shaft, and a fourth permanent magnet embedded in the outer edge of the inner rotor core.

[0017] As a further optimization of the magnetic field modulation type permanent magnet memory motor described in this utility model, a gap is left between the radial inner side of the outer rotor, the magnetic adjustment block, and the radial outer side of the inner rotor.

[0018] As a further optimization of the magnetic field modulation type permanent magnet memory motor described in this utility model, the middle part of the outer rotor thickness is the torque winding. The torque winding is magnetically coupled through the rotation of the outer rotor, so that the inner rotor and the outer rotor of the permanent magnet memory motor are integrated and rigidly connected, and the inner rotor has heat dissipation holes.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0020] (1) During operation, excessive internal current causes losses to the motor, reducing the proportion of the effective magnetic field and posing a serious safety hazard. Therefore, by designing permanent magnets on the external rotor to increase or decrease magnetization, an additional safety guarantee is provided for the motor's magnetic adjustment capability. In the event of a fault, the magnetic flux can be reduced to a safe level using pulses;

[0021] (2) Since the magnetization method of magnetic gears is mainly focused on parallel magnetization, these two magnetization methods often lead to a serious magnetic leakage phenomenon at the end of the permanent magnet. Therefore, structural innovation was carried out, starting with the memory motor structure. The permanent magnet of AlNiCo material is magnetized and demagnetized by the armature winding on the stator, and then the torque winding in the outer rotor is introduced to modulate the magnetic field and transmit it to the magnetic gear structure of the inner rotor. The magnetic field distribution is orderly, which effectively solves the problem of serious magnetic leakage of the motor.

[0022] (3) Although the magnetic pulse of the motor is short, the current is large, which will cause local coupling and put forward higher requirements for thermal management. This also indirectly limits the continuous torque output capability of the motor. Therefore, through structural innovation and the introduction of torque winding to sort the magnetic flux, the net torque of the high-speed outer rotor is zero under the dual action of electromagnetic torque and magnetic gear torque. Furthermore, due to the existence of the transmission ratio, the motor can achieve a small excitation current input and a large torque output of the inner rotor. Attached Figure Description

[0023] Figure 1 This is a topology diagram of the motor structure;

[0024] Figure 2 This is a diagram of the magnetic field of the motor structure.

[0025] Figure 3a This is a diagram showing the interaction between the stator and the outer rotor. Figure 3b Schematic diagram of the inner and outer rotors;

[0026] Figure 4 , 5 This is a waveform diagram of the motor's PWM modulation.

[0027] Figure 6 , 7 Figure 8 shows the simulation diagram of the motor under experimental conditions.

[0028] The reference numerals in the figure are explained as follows:

[0029] 1-Stator, 11-Stator yoke, 12-Stator tooth, 13-Stator slot, 2-Armature winding, 3-Outer rotor, 31-Outer rotor core, 32-First permanent magnet, 33-Second permanent magnet, 34-Torque winding, 35-Third permanent magnet, 4-Magnetic adjustment block, 5-Inner rotor, 51-Fourth permanent magnet, 52-Inner rotor core. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] A magnetic field-modulated permanent magnet memory motor with gears comprises, from the inside out, an inner rotor 5, an outer rotor 3, and a stator 1, wherein...

[0032] The stator 1 includes a stator yoke 11, stator teeth 12 are provided between the stator yoke 11 and the outer rotor 3, and stator slots 13 are formed between two adjacent stator teeth, with an armature winding 2 embedded in each stator slot;

[0033] The outer rotor 3 includes an outer rotor core 31. The outer end of the outer rotor core 31 includes multiple V-shaped structures. The V-shaped structures are magnetic pole components. The multiple magnetic pole components are evenly arranged in the circumferential direction.

[0034] A magnetic adjustment block 4 is provided in the gap between the outer rotor and the inner rotor.

[0035] When facing the opening of the V-shaped structure, the right component of the V-shaped structure is a first permanent magnet 32 ​​with different magnetic circuits, and the left component is a second permanent magnet 33 with parallel magnetic circuits. The first permanent magnet and the second permanent magnet form an angle with the opening facing outward.

[0036] The gap between the outer rotor and the inner rotor is an air gap with a thickness of 1 mm.

[0037] The armature windings are distributed circumferentially at 6°. Each pair of armature windings forms one phase, with a total of 15 groups and a phase difference of 24°.

[0038] The armature winding is six-phase, and after the armature winding is energized, the first permanent magnet is radially magnetized.

[0039] The outer rotor end is composed of multiple layers of silicon steel sheets, and the stator exterior is composed of multiple layers of outer silicon steel sheets.

[0040] The outer rotor 3 has a third permanent magnet 35 embedded inside it. The inner rotor 5 includes a central rotating shaft, an inner rotor core 52 surrounding the rotating shaft, and a fourth permanent magnet 51 embedded in the outer edge of the inner rotor core.

[0041] There is a gap between the radial inner side of the outer rotor, the magnetic adjustment block, and the radial outer side of the inner rotor.

[0042] The middle part of the outer rotor thickness is the torque winding 34. The torque winding is magnetically coupled through the rotation of the outer rotor, so that the inner rotor and the outer rotor of the permanent magnet memory motor are rigidly connected as a whole, and the inner rotor has heat dissipation holes.

[0043] This motor adopts an external rotor memory motor—internal rotor magnetic gear nested structure, as detailed below:

[0044] Outer Structure: The motor stator and outer rotor each have an independent set of windings, responsible for magnetizing and demagnetizing the permanent magnets, controlling the levitation of the magnetic gears, and modulating the magnetic field between the permanent magnets, respectively. The armature winding is supplied with a specific frequency current, generating a high-speed rotating magnetic field to magnetize and demagnetize the first permanent magnet on the outer rotor, indirectly providing continuous driving torque. The torque winding, through precise control of the magnetic field, achieves stable radial and axial levitation of the rotor, completely eliminating mechanical contact and providing continuous driving torque to the inner rotor.

[0045] Internal structure: The levitation winding achieves magnetic coupling through the rotation of the outer rotor, enabling a rigid, integrated connection between the inner rotor of the permanent magnet memory motor and the outer rotor of the magnetic gear. The inner rotor features heat dissipation holes, which not only effectively manage magnetic flux to prevent excessive magnetic field coupling but also dissipate heat, ensuring the motor's operating efficiency. This design deeply couples the torque transmission function of the magnetic gear with the power output function of the permanent magnet motor, eliminating the need for additional transmission components.

[0046] The stator is composed of multiple layers of stacked outer silicon steel sheets. It has multiple stator slots, each containing an armature winding. The armature windings are distributed circumferentially at 6° intervals, with two windings forming one phase, totaling 15 groups with a phase difference of 24°. The stator includes a stator yoke, with stator teeth positioned between the yoke and the outer rotor. Adjacent stator teeth form stator slots. The armature windings are six-phase and mounted on the stator teeth. When the armature windings are energized, they radially magnetize the first permanent magnet.

[0047] The outer rotor end is composed of multiple layers of silicon steel sheets. The overall structure includes the rotor core, on which multiple V-shaped structures are installed. The V-shaped structures are magnetic pole assemblies, which are evenly arranged circumferentially to reduce the problem of magnetic field deviation.

[0048] The magnetic pole assembly includes a first permanent magnet and a second permanent magnet on the outer rotor core. The two first permanent magnets in the same magnetic pole assembly form a series magnetic circuit, and the two second permanent magnets in the same magnetic pole assembly form a parallel magnetic circuit.

[0049] The first permanent magnet and the second permanent magnet are respectively arranged on both sides, and an angle is formed between the first permanent magnet and the second permanent magnet.

[0050] The first permanent magnet is made of AlNiCo, and the second permanent magnet is made of NdFeB.

[0051] The portion of the outer rotor with moderate thickness is the torque winding, and its current direction is as shown in the structure. Figure 1 As shown, the outer rotor has a third permanent magnet embedded inside. The outer rotor and the inner rotor are separated by a magnetic adjustment block. There is a gap between the radial inner side of the outer rotor, the magnetic adjustment ring and the radial outer side of the permanent magnet inner rotor. The fourth permanent magnet is embedded in the outer end of the inner rotor, and the shaft is in the middle.

[0052] The third and fourth permanent magnets are made of neodymium iron boron.

[0053] A magnetic adjustment block is provided between the third and fourth permanent magnets at a thin air gap with a thickness of 1 mm.

[0054] like Figure 1 The motor is mainly divided into three parts: stator 1, outer rotor 3, and inner rotor 5. The stator is equipped with armature windings 2, which are circumferentially distributed at a 6° angle. The outer rotor is rotatably connected to the inner side of the stator and includes an outer rotor core 31. Multiple magnetic pole assemblies are mounted on the outer rotor core, and these assemblies are evenly distributed circumferentially. Each magnetic pole assembly includes a first permanent magnet 32 ​​with different magnetic circuits and a second permanent magnet 33 with parallel magnetic circuits. The first and second permanent magnets form an outward-opening angle. The moderately thick portion of the outer rotor is the torque winding 34. During motor operation, the torque winding amplifies the peak magnetic field and drives the interaction force between the outer and inner rotors. A magnetic adjustment block 4 is located in the gap between the outer and inner rotors. Through magnetic field modulation, magnetic field coupling is generated between the third permanent magnet 35 and the fourth permanent magnet 51. The inner rotor includes an inner rotor core 52, with a fourth permanent magnet embedded in the outer end of the inner rotor core, and the middle part of the inner rotor is the shaft.

[0055] Operating principle: such as Figure 2 As shown, the stator armature windings are distributed circumferentially at 6°, with each pair of armature windings forming a phase, totaling 15 groups with a phase difference of 24°. When current flows through the armature windings, it radially magnetizes the first permanent magnet on the outer rotor. The first permanent magnet is made of AlNiCo, which improves low coercivity and forms a parallel magnetic circuit with the second permanent magnet for magnetic transmission. The armature windings generate a rotating magnetic field that is tuned with the magnetic pole assembly of the outer rotor, driving the outer rotor to rotate at high speed.

[0056] Specifically, such as Figure 3a The diagram shown illustrates the principle of magnetic field modulation. Figure 3a Diagram showing the interaction between the stator and the outer rotor:

[0057] 1. When the armature winding is energized, the armature winding of the stator is used as the excitation source to magnetize the first permanent magnet. The first permanent magnet and the second permanent magnet constitute the N and S of the magnetic pole assembly. The second permanent magnet is magnetized in the direction of the magnetic flux of the first permanent magnet. At this time, both the first permanent magnet and the second permanent magnet are in a magnetized state. After the magnetic flux of the two is superimposed, it passes through the gap, first reaches the stator tooth 12, then passes through the stator yoke 11 and passes through the adjacent symmetrically distributed magnetic pole assemblies, and finally returns to the first permanent magnet of each magnetic pole assembly.

[0058] 2. When the armature winding is de-energized, the first permanent magnet is in a demagnetized state. In the weak magnetic state, since the second permanent magnet is made of neodymium iron boron, which is a strong magnetic material, the second permanent magnet will be magnetized in the opposite direction of the magnetic flux of the first permanent magnet. At this time, the second permanent magnet is in a weak magnetic state. Part of the permanent magnet flux originating from the first permanent magnet is short-circuited. The flux passes through the second permanent magnet and returns directly to the first permanent magnet. The remaining flux passes through the air gap, first reaches the stator teeth, then passes through the stator yoke and the adjacent symmetrically distributed magnetic pole assemblies, and finally returns to the first permanent magnet.

[0059] Next is the interaction between the outer rotor and the inner rotor. The outer rotor has a third permanent magnet embedded inside. When the armature winding on the stator adds or removes magnetization to the first permanent magnet, the first permanent magnet will modulate the magnetic field of the second permanent magnet. Their magnetic fields and torque windings generate magnetic flux, which is transmitted to the third permanent magnet. Then, through the modulation of the magnetizing block, a pole pair harmonic magnetic field matching the magnetic field of the fourth permanent magnet is generated, driving the inner rotor to rotate.

[0060] The specific principle is as follows: Figure 3b The diagram illustrates the principle of the inner and outer rotors. Energizing the armature winding magnetizes the first and second permanent magnets. Part of the magnetic flux passes through the torque winding's magnetic field and is superimposed along the torque winding's flux. The high-speed outer rotor serves as the input rotor for the inner rotor. The torque winding of the outer rotor guides the magnetic pole assembly for magnetic circuit transmission and coupling, influencing the third permanent magnet. Adjusting the magnetization via the adjusting block exerts a strong force on the fourth permanent magnet of the inner rotor. Simultaneously, adjusting the current in the torque winding generates radial forces in different directions to ensure stable operation and levitation of the inner rotor and the adjusting block.

[0061] Figure 3bThe upper part is the third permanent magnet 35, the lower part is the fourth permanent magnet 51, and the middle part is the adjusting block. The adjusting block is attracted by both the third and fourth permanent magnets. The magnetic moments of different parts of the adjusting block are different in direction and magnitude. The third permanent magnet forms a harmonic magnetic field with 5 wavelengths, and the fourth permanent magnet forms a harmonic magnetic field with 7 wavelengths. The magnetic field of the third permanent magnet is further adjusted by the magnetic moments inside the adjusting block. After modulation by the adjusting block, an adjusting magnetic field matching the magnetic field of the fourth permanent magnet is generated in the air gap between the outer and inner rotors. The wavelength of the adjusting magnetic field is equal to the number of adjusting blocks minus the number of wavelengths of the third permanent magnet's magnetic field, which is 5 wavelengths of harmonics. The magnetic field of the fourth permanent magnet also has the same 5 wavelengths of harmonics. When the adjusting magnetic field and the magnetic field of the fourth permanent magnet remain stable due to the attraction between opposite poles, driving the third permanent magnet to move one wavelength to the right will cause the adjusting magnetic field of the fourth permanent magnet to move one wavelength to the left, thus driving the magnetic field of the third permanent magnet to move synchronously. The transmission ratio formula is: i = -p / q = N. S / N P (p is the number of pole pairs of the inner rotor, q is the number of pole pairs of the outer rotor, N) S N is the rotational speed of the outer rotor. P (where the rotational speed is the inner rotor speed), and the transmission ratio is 0.7, so the third permanent magnet rotates 7 times and the fourth permanent magnet rotates 5 times, thus realizing the transmission of the magnetic gear.

[0062] In addition, the normal operation of a motor is related to its rated voltage, rated current, and overload factor. Therefore, the motor must meet the following operating conditions during operation:

[0063]

[0064] Among them, i smax ,u smax These are the current and voltage limits of the armature winding on the stator of the motor after overload.

[0065] Because the stator armature windings are distributed circumferentially at 6°, with each pair of armature windings forming a phase, totaling 15 groups and a phase difference of 24°, a PWM modulation strategy is adopted. When operating in the linear region, the stator voltage limit value u... smax Voltage u of the bus dc The following relationship exists:

[0066] u smax =u dc ·cos12°=0.84u dc

[0067] When selecting materials for memory motors, because AlNiCo permanent magnets are weak magnets, their magnetization state cannot be increased indefinitely. There are upper and lower limits to the magnetization state of AlNiCo permanent magnets within the motor. The goal is to ensure that the armature winding current is sufficient to stably maintain the magnetization state of the permanent magnet at these upper and lower limits. Therefore, the constraint on the magnetizing current is as follows:

[0068] -i Nfmax ≤i f ≤i Pfmax

[0069] Among them, -i Nfmax i is the minimum current required to demagnetize the first permanent magnet to its lowest operating point. Pfmax The minimum current required to magnetize the first permanent magnet to its highest operating point.

[0070] When the motor is operating under low-speed, heavy-load conditions, the resistance voltage drop of the armature winding cannot be ignored. After the motor reaches steady state, the dq-axis voltage equation is:

[0071] u d =R s i d -P n ω m (L q i q )

[0072] u q =R s i q +P n ω m (L d i d +ψ f )

[0073] Where ω m Let be the mechanical angular velocity of the motor. Therefore, the voltage constraint is:

[0074]

[0075] Conversely, when the motor operates at high speed, the voltage drop across the stator armature winding is almost negligible compared to the motor's back electromotive force. The equation for the dq-axis voltage after the motor reaches steady state is:

[0076] u d =-P n ω m (L q i q )

[0077] u q =P n ω m (L d id +ψ f )

[0078] The resulting voltage constraint is:

[0079]

[0080] It can be seen that this motor is suitable for high-speed operation, and its working range is significantly expanded compared to motors operating at low speeds. This gives the motor greater flexibility during operation.

[0081] Secondly, due to the use of a PWM modulation strategy, the microcontroller's timer TMOD is used in mode 1 for timing. The input program makes the output PWM signal equal to the motor speed of 1500 rpm. However, since previous TMODs generally had a 1ms period for timing, although the result was accurate, according to the simulation waveform, as shown... Figure 4 As shown, the waveform is not stable, so a waveform period of 4ms was directly used for output, resulting in the following: Figure 5 The waveform diagram shows that the PWM signal changes after the count value reaches the comparison value, which in turn changes the state of the H-bridge drive module, thereby achieving precise control of the motor.

[0082] Since peak flux linkage, iron loss, and eddy currents in the magnets significantly affect the operating efficiency of a motor, we started with the air gap width of the motor and conducted experimental simulations to study the peak flux linkage, iron loss, and eddy current losses in the magnets. First, the relationship between the air gap width and the peak flux linkage is as follows: Figure 6 The vertical axis represents the peak flux linkage, and the horizontal axis represents the air gap width. Figure 6 It can be seen that as the air gap width gradually increases, the peak flux density gradually decreases. Secondly, the relationship between air gap width and iron loss is as follows: Figure 7 The vertical axis represents iron loss, and the horizontal axis represents the air gap width. Figure 7 It can be seen that as the air gap width gradually increases, the iron loss gradually decreases. Finally, the relationship between the air gap width and the eddy current loss of the magnet is as follows: Figure 8 The vertical axis represents the eddy current loss of the magnet, and the horizontal axis represents the air gap width. Figure 8 It can be seen that as the air gap width gradually increases, the eddy current loss of the magnet tends to a stable value. Considering that iron loss and eddy current loss of the magnet are unavoidable during motor operation, and that a certain flux linkage peak is required for the permanent magnet to gain or lose magnetization during motor operation, the air gap width of the motor is set to 1.25mm to ensure normal motor operation.

[0083] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A magnetic field-modulated permanent magnet memory motor with gears, characterized in that, From the inside out, it includes an inner rotor, an outer rotor, and a stator, wherein, The stator includes a stator yoke, stator teeth are provided between the stator yoke and the outer rotor, and stator slots are formed between two adjacent stator teeth, with armature windings embedded in each stator slot; The outer rotor includes an outer rotor core, and the outer end of the outer rotor core includes multiple V-shaped structures. The V-shaped structures are magnetic pole assemblies, and the multiple magnetic pole assemblies are evenly arranged circumferentially. A magnetic adjustment block is provided in the gap between the outer rotor and the inner rotor.

2. The magnetic field-modulated permanent magnet memory motor with gears according to claim 1, characterized in that, When facing the opening of the V-shaped structure, the right component of the V-shaped structure is a first permanent magnet with different magnetic circuits, and the left component is a second permanent magnet with parallel magnetic circuits. The first permanent magnet and the second permanent magnet form an angle with the opening facing outward.

3. The magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, The gap between the outer rotor and the inner rotor is an air gap with a thickness of 1 mm.

4. A magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, The armature windings are distributed circumferentially at 6°.

5. A magnetic field-modulated permanent magnet gear memory motor according to claim 4, characterized in that, Each pair of armature windings forms one phase, with a total of 15 phases and a phase difference of 24°.

6. A magnetic field-modulated permanent magnet gear memory motor according to claim 2, characterized in that, The armature winding is six-phase, and after the armature winding is energized, the first permanent magnet is radially magnetized.

7. A magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, The outer rotor end is composed of multiple layers of silicon steel sheets, and the stator exterior is composed of multiple layers of outer silicon steel sheets.

8. A magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, The outer rotor has a third permanent magnet embedded inside. The inner rotor includes a central shaft, an inner rotor core surrounding the shaft, and a fourth permanent magnet embedded in the outer edge of the inner rotor core.

9. A magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, There is a gap between the radial inner side of the outer rotor, the magnetic adjustment block, and the radial outer side of the inner rotor.

10. A magnetic field-modulated permanent magnet gear memory motor according to claim 1, characterized in that, The middle part of the outer rotor thickness is the torque winding. The torque winding is magnetically coupled through the rotation of the outer rotor, so that the inner rotor and outer rotor of the permanent magnet memory motor are rigidly connected as a whole, and the inner rotor has heat dissipation holes.

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