A parallel magnetic circuit permanent magnet vernier motor

Abstract

The invention relates to the technical field of permanent magnet vernier motors, and provides a parallel magnetic circuit permanent magnet vernier motor, comprising a left rotor claw pole, a spoke-type permanent magnet, a stator, a stator winding, an intermediate magnetic ring and a right rotor claw pole; the left rotor claw pole, the intermediate magnetic ring and the right rotor claw pole are assembled in sequence from left to right to form a rotor, and the rotor and the stator are assembled; the left rotor claw pole and the right rotor claw pole are assembled together, and a cavity for placing the intermediate magnetic ring is formed between two claw pole disks of the left rotor claw pole and the right rotor claw pole; the spoke-type permanent magnet is composed of a plurality of permanent magnets distributed in a circular array, and a single permanent magnet is held between the claw poles of the left rotor claw pole and the right rotor claw pole; the spoke-type permanent magnet adopts tangential excitation, and the intermediate magnetic ring adopts axial excitation; the magnetic flux path of the spoke-type permanent magnet and the magnetic flux path of the intermediate magnetic ring exist in a mutually independent parallel manner; through the design of parallel excitation, the magnetic flux of the main magnetic circuit is enhanced, and the torque density and power factor of the motor are improved.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet vernier motors, and in particular to a parallel magnetic circuit permanent magnet vernier motor. Background Art

[0002] Permanent magnet vernier motors use the magnetic field modulation effect to achieve magnetic field self-increase speed. They can generate large torque when running at low speeds and exhibit the characteristics of high torque density. Therefore, they are particularly suitable for low-speed direct drive scenarios. One of the current research focuses on permanent magnet vernier motors is how to further improve the torque density of permanent magnet vernier motors. However, permanent magnet vernier motors generally face a challenge: motors with high torque density often have a low power factor of only about 0.6; while motors with higher power factors have relatively low torque density, usually less than 20 kNm / m 3 .

[0003] Related research points out that the main reason for the low power factor of permanent magnet vernier motors is the insufficient air gap flux density generated by permanent magnets. This means that the power factor of the motor can be improved by adopting different permanent magnet topological structures and adjusting the position and amount of permanent magnets. Patent CN116054449A introduces a spoke-type permanent magnet vernier motor, which effectively improves the air gap flux density, thereby enhancing the torque density of the motor. Although the distributed winding it adopts can improve the torque, there are problems such as too long winding ends and large copper loss, and the misplaced placement of its permanent magnets makes the rotor processing complicated. Another patent CN101741200A proposes a traditional permanent magnet synchronous claw pole motor, which combines spoke-type permanent magnets with DC coils for joint excitation, further improving the air gap flux density. Although the magnetic adjustment function is achieved through hybrid excitation, the excitation current of the DC coil increases the copper loss of the motor, and the DC coil is located on the rotor, and brushes and other components need to be added, which increases the difficulty of maintenance. In order to solve these problems, the present invention proposes a parallel magnetic circuit permanent magnet vernier motor. Summary of the invention

[0004] The present invention aims to provide an efficient, reliable and high-performance motor solution, and therefore provides a parallel magnetic circuit permanent magnet vernier motor. By adopting the innovative design of intermediate magnetic ring and claw pole interpole spoke permanent magnet parallel excitation, not only the load torque of the motor is improved, but also the power factor of the permanent magnet vernier motor is improved, thereby meeting the high standards of modern industry for motor performance.

[0005] In order to solve the above technical problems, the present invention provides a parallel magnetic circuit permanent magnet vernier motor, comprising a left rotor claw pole, a spoke permanent magnet, a stator, a stator winding, an intermediate magnetic ring and a right rotor claw pole;

[0006] The left rotor claw pole, the middle magnetic ring, and the right rotor claw pole are assembled from left to right to form a rotor, and the rotor is assembled with the stator; the left rotor claw pole and the right rotor claw pole are assembled together, and a cavity for placing the middle magnetic ring is formed between the two claw pole disks of the left rotor claw pole and the right rotor claw pole;

[0007] The spoke-type permanent magnet is composed of a plurality of permanent magnets distributed in an array along a circumference, and a single permanent magnet is held between the claw poles of the left rotor and the claw pole of the right rotor;

[0008] The spoke-type permanent magnet adopts tangential excitation, and the intermediate magnetic ring adopts axial excitation; the claw pole disks of the left rotor claw pole and the right rotor claw pole are magnetized into N poles and S poles respectively by the intermediate magnetic ring to form a rotor magnetic field; the magnetic flux path of the spoke-type permanent magnet and the magnetic flux path of the intermediate magnetic ring exist in a mutually independent parallel manner.

[0009] In a preferred embodiment, the permanent magnets are disposed between all claw poles of the left rotor claw pole and the right rotor claw pole; and the excitation directions of two adjacent permanent magnets are opposite.

[0010] In a preferred embodiment, a plurality of the permanent magnets are held between the claw poles of the left rotor claw pole and the right rotor claw pole in an interval-placed manner, and the interval is set to be the interval between one claw pole; and the excitation direction of all the permanent magnets is the same.

[0011] In a preferred embodiment, the magnetic flux path of the intermediate magnetic ring is that the magnetic flux starts from one side of the intermediate magnetic ring, passes through one of the left rotor claw pole and the right rotor claw pole to enter the air gap space, then passes through the air gap to enter the stator, and enters the air gap again after surrounding the tooth slots of the stator, and finally passes through the other claw pole of the left rotor claw pole and the right rotor claw pole and returns to the other side of the intermediate magnetic ring, thereby forming a complete closed loop.

[0012] In a preferred embodiment, the magnetic flux path of the spoke-type permanent magnet is that the magnetic flux starts from one of the permanent magnets, first enters the rotor yoke through the claw pole adjacent to the permanent magnet, and then enters the air gap space through another claw pole adjacent to the claw pole disk on the same side as the permanent magnet; then, the magnetic flux enters the stator and surrounds the stator tooth slots, then crosses the air gap again, enters a claw pole of the claw pole disk on the opposite side of the permanent magnet, and finally returns to the other side of the starting permanent magnet, thereby forming a closed loop.

[0013] In a preferred embodiment, the stator teeth of the stator are configured as a split tooth structure.

[0014] In a preferred embodiment, the left rotor claw pole, the right rotor claw pole and the stator teeth are all configured as wave teeth or saw-shaped teeth, and the wave teeth or saw-shaped teeth are configured on one side or on both sides.

[0015] In a preferred embodiment, the stator winding is configured as a double-layer concentrated winding.

[0016] In a preferred embodiment, the claw poles of the left rotor claw pole and the claw pole of the right rotor claw pole are both configured as axial V-shaped pole claws, and the claw poles of the left rotor claw pole and the claw poles of the right rotor claw pole are adapted to be plugged into each other.

[0017] In a preferred embodiment, the permanent magnet vernier motor is a double stator claw pole permanent magnet vernier motor; the motor includes two groups of left rotor claw poles, both of which are arranged in inner and outer rings, two groups of spoke-type permanent magnets, two groups of stators, two groups of stator windings, two groups of right rotor claw poles and a single annular structure intermediate magnetic ring;

[0018] The middle magnetic ring and two groups of spoke-type permanent magnets arranged on the inner and outer rings are excited in parallel.

[0019] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0020] 1. Provide a parallel magnetic circuit permanent magnet vernier motor, aiming to solve the problem of the existing permanent magnet vernier motor power factor and torque density being difficult to balance, and further improve the torque density of the permanent magnet vernier motor. Through innovative design, the comprehensive improvement of motor performance is achieved, meeting the requirements of modern industry for efficient, reliable, and high-performance motors.

[0021] 2. The parallel excitation design of the intermediate magnetic ring and the claw pole inter-pole spoke permanent magnet enhances the magnetic flux of the main magnetic circuit, thereby effectively improving the torque density of the motor. In addition, this parallel excitation method also increases the air gap magnetic flux density of the motor, thereby optimizing the power factor and torque density of the motor, so that the power factor of the motor can reach 0.88 when running at full load, and the torque density can reach 38.35kNm / m 3 .

[0022] 3. The motor adopts the method of parallel excitation of the intermediate magnetic ring and the claw pole array permanent magnet, which effectively improves the no-load back electromotive force and load torque of the motor. Specifically, by setting an array of permanent magnets between the claw poles and exciting them in parallel with the intermediate magnetic ring, the magnetic flux generated by the intermediate magnetic ring and the spoke-type permanent magnet array can be superimposed, which enhances the magnetic induction intensity of the motor and allows the motor to generate greater torque. At the same time, the parallel excitation method can increase the air gap magnetic density of the motor, thereby improving the power factor of the permanent magnet vernier motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded structural diagram of a parallel magnetic circuit permanent magnet vernier motor in the first embodiment of the present invention;

[0024] Figure 2The claw pole, stator tooth structure and spoke-type permanent magnet excitation direction in the first embodiment of the present invention;

[0025] Figure 3 A cross-sectional view of a rotor in a first embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the magnetic flux path of the spoke-type permanent magnet and the magnetic flux path of the intermediate magnetic ring in the first embodiment of the present invention;

[0027] Figure 5 It is an FFT analysis diagram of no-load air gap flux density of different excitation modes in the first embodiment of the present invention;

[0028] Figure 6 It is a no-load single-phase flux curve diagram of the motor in the first embodiment of the present invention;

[0029] Figure 7 is a structural diagram of a motor in a first embodiment of the present invention;

[0030] Figure 8 It is a graph of the no-load back electromotive force of the motor in the first embodiment of the present invention;

[0031] Fig. 9 The motor torque characteristic curve in the first embodiment of the present invention;

[0032] Fig.10 The motor phase induced current and induced electromotive force in the first embodiment of the present invention;

[0033] Fig.11 The air gap harmonic analysis of the motor load in the first embodiment of the present invention;

[0034] Fig.12 A magnetic density cloud diagram of the motor core of the motor in the first embodiment of the present invention;

[0035] Fig.13 A magnetic flux density cloud diagram of a motor rotor of a motor in the first embodiment of the present invention;

[0036] Fig.14 It is a structural diagram of a double-stator claw-pole permanent magnet vernier motor in a second embodiment of the present invention;

[0037] Fig.15 It is a structural diagram of a permanent magnet vernier motor with axial V-shaped pole claws in the third embodiment of the present invention;

[0038] Fig.16 It is a structural diagram of a parallel magnetic circuit permanent magnet vernier motor in a fourth embodiment of the present invention;

[0039] Fig.17 1 is a structural diagram of the wavy teeth and saw-shaped teeth of the stator and rotor claw poles in the fifth embodiment of the present invention.

[0040] Explanation of the accompanying drawings: 1. left rotor claw pole; 2. spoke-type permanent magnet; 3. stator; 4. stator winding; 5. intermediate magnetic ring; 6. right rotor claw pole; 7. inner and outer permanent magnets; 8. inner and outer rotors; 9. inner and outer windings; 10. inner and outer stators; 11. rotor; 12. axial V-shaped pole claws; 13. interval poles; 14. claw pole plates; 15. wave-shaped teeth; 16. saw-shaped teeth. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] First embodiment, reference Figure 1-Figure 13 .

[0045] The present embodiment provides a parallel magnetic circuit permanent magnet vernier motor. Permanent magnet vernier motors have attracted attention due to their characteristics of low speed and high torque density, and have broad application prospects in electric vehicles, aerospace, and ship drives. However, compared with traditional permanent magnet motors, their pole pairs and leakage magnetic flux increase, resulting in a lower power factor. The parallel magnetic circuit permanent magnet vernier motor proposed in this embodiment aims to provide an efficient, reliable and high-performance motor solution. By adopting the innovative design of the intermediate magnetic ring 5 and the claw-pole inter-pole spoke permanent magnet parallel excitation, not only the load torque of the motor is improved, but also the power factor of the permanent magnet vernier motor is improved, thereby meeting the high standards of modern industry for motor performance.

[0046] like Figure 1 The parallel magnetic circuit permanent magnet vernier motor provided in this embodiment has a basic structure including a left rotor claw pole 1, a spoke permanent magnet 2, a stator 3, a stator winding 4, an intermediate magnetic ring 5 and a right rotor claw pole 6. The left rotor claw pole 1, the intermediate magnetic ring 5 and the right rotor claw pole 6 are assembled in sequence from left to right to form a rotor, and the rotor is assembled with the stator 3. The left rotor claw pole 1 and the right rotor claw pole 6 are assembled together, and a cavity for placing the intermediate magnetic ring 5 is formed between the two claw pole disks of the left rotor claw pole 1 and the right rotor claw pole 6. The spoke permanent magnet 2 is composed of a plurality of permanent magnets distributed in a circular array, and a single permanent magnet is held between the claw poles of the left rotor claw pole 1 and the right rotor claw pole 6. The magnetic flux path of the spoke permanent magnet 2 and the magnetic flux path of the intermediate magnetic ring 5 exist in a mutually independent parallel manner.

[0047] In particular, in this embodiment, the stator teeth of the stator 3 are configured as a split-tooth structure, and the stator winding 4 is configured as a double-layer concentrated winding. Figure 2 As shown, the spoke-type permanent magnet 2 adopts tangential excitation, and the excitation directions of the two adjacent permanent magnets are opposite, while the middle magnetic ring 5 adopts axial excitation, which can ensure that the magnetic flux generated by the two different permanent magnets reinforce each other in the magnetic circuit. In addition, the stator teeth are arranged as a split structure. Through the modulation of the stator teeth, the rotor permanent magnet magnetomotive force and the stator winding 4 magnetomotive force of the motor can generate rich effective working harmonics.

[0048] In this embodiment, the slot-pole matching of the motor follows the formula In this formula, P w Represents the number of winding pole pairs of the motor, P m is the number of modulation tooth pole pairs, P r Indicates the number of rotor pole pairs, N s represents the number of slots in the motor, and N is the number of teeth on a stator tooth. The stator 3 in this embodiment is designed with 12 slots, so the number of modulation tooth pole pairs is 24 pairs. Since the rotor in this embodiment has 19 pairs of poles, the number of pole pairs of the motor winding P can be obtained by combining the formula w There should be 5 pairs of poles.

[0049] The working principle of the motor in this embodiment, the cross-sectional view of the motor rotor is as follows Figure 3 As shown, the motor provided in this embodiment adopts a structure of a spoke-type permanent magnet 2 combined with an intermediate magnetic ring 5 in the rotor structure to construct a unique rotor. Due to the unique design of the rotor, two main magnetic flux paths (i.e., the magnetic flux path of the spoke-type permanent magnet 2 and the magnetic flux path of the intermediate magnetic ring 5) exist in a mutually independent parallel manner.

[0050] like Figure 4 As shown, the main magnetic flux path 1 is mainly provided by the intermediate magnetic ring 5, that is, the magnetic flux path of the intermediate magnetic ring 5. The intermediate magnetic ring 5 adopts axial excitation, so that the claw pole disks of the left rotor claw pole 1 and the right rotor claw pole 6 are magnetized to N pole and S pole respectively by the intermediate magnetic ring 5, forming a rotor magnetic field. The main magnetic flux path 1 (the magnetic flux path of the intermediate magnetic ring 5) is that the magnetic flux starts from one side of the intermediate magnetic ring 5, passes through one of the claw poles of the left rotor claw pole 1 and the right rotor claw pole 6 to enter the air gap space, then passes through the air gap to enter the stator 3, and enters the air gap again after surrounding the tooth slot of the stator 3, and finally passes through the other claw pole of the left rotor claw pole 1 and the right rotor claw pole 6 and returns to the other side of the intermediate magnetic ring 5, thereby forming a complete closed loop.

[0051] like Figure 4 As shown, on the other hand, permanent magnets are arranged between all claw poles of the left rotor claw pole and the right rotor claw pole, and the excitation directions of two adjacent permanent magnets are opposite. The magnetic flux of the main magnetic flux path 2 (i.e., the magnetic flux path of the spoke-type permanent magnet 2) starts from one of the permanent magnets, first enters the rotor yoke through the claw pole adjacent to the permanent magnet, and then enters the air gap space through another claw pole adjacent to the claw pole disk on the same side as the permanent magnet; then, the magnetic flux enters the stator 3 and surrounds the stator tooth slot, and then crosses the air gap again, enters a claw pole of the claw pole disk on the opposite side of the permanent magnet, and finally returns to the other side of the starting permanent magnet, thereby forming a closed loop.

[0052] The two main flux paths, namely Figure 4 The main magnetic flux path 1 and the main magnetic flux path 2 shown are positively superimposed in the air gap, and they jointly affect the output torque of the motor in the form of parallel excitation. Since the spoke-type permanent magnet 2 is tangentially excited, there is a magnetic flux gathering effect, and its leakage flux is much smaller than that of the axially excited magnetic ring. Therefore, the contribution of the spoke-type permanent magnet 2 to the torque is greater than that of the intermediate magnetic ring 5.

[0053] Analyzing from the rotor side, the traditional permanent magnet claw-pole motor will form 19 pairs of poles under the excitation of the middle magnetic ring 5. Similarly, the rotor spoke type permanent magnet claw-pole motor will also produce 19 pairs of poles, and the magnetic permeability waveforms of the two on the rotor side are consistent. For this reason, under the modulation of the stator 3 split teeth, the main working harmonics of these two motors under no-load state are 19th harmonics. The parallel excitation method proposed in this embodiment, the 19th harmonic amplitude in the air gap when no-load is theoretically equivalent to the superposition of the traditional permanent magnet claw-pole motor and the rotor spoke type permanent magnet claw-pole motor.

[0054] Based on three different excitation methods, the no-load air gap harmonics of single excitation intermediate magnetic ring 5 excitation, single excitation spoke permanent magnet excitation, and double excitation permanent magnet parallel excitation are analyzed. The relevant results are as follows Figure 5 As shown. In this technical solution, the 19th harmonic amplitude is as high as 0.697 T. In contrast, when only the middle magnetic ring 5 is excited, the 19th harmonic amplitude is 0.129 T; and when only the spoke permanent magnet is excited, the amplitude is 0.513 T. It is worth noting that the 19th harmonic amplitude achieved by this technical solution not only exceeds the values ​​of the above two excitation methods when they act alone, but is also better than the result of adding the two together.

[0055] pass Figure 6 The no-load single-phase flux linkages of the three different excitation modes are shown. It can be observed that the flux linkage in this embodiment is theoretically equivalent to the flux linkage superposition effect of the single excitation intermediate magnetic ring 5 excitation and the single excitation spoke permanent magnet excitation. Figure 6 As shown in the figure, the maximum value of the no-load single-phase flux linkage of this embodiment is as high as 0.24 Wb. In comparison, the maximum value of the excitation of the single-excitation intermediate magnetic ring 5 is only 0.05 Wb, and the maximum value of the single-excitation spoke permanent magnet excitation is 0.18 Wb. It is worth noting that the maximum value of the no-load single-phase flux linkage of this embodiment not only far exceeds the above two single-excitation excitation methods, but even exceeds the sum of the two, showing its significant advantages.

[0056] The optimized motor structure of this embodiment is as follows Figure 7 As shown in the figure, the proportion of the spoke-type permanent magnet 2 in the rotor claw pole has been significantly increased. For the no-load back electromotive force waveform of the motor before and after optimization, please refer to Figure 8 , its effective value increased by 15% compared with before optimization.

[0057] When the motor is loaded, the torque density of the motor is 38.35kNm / m 3 , Fig. 9 The torque characteristics at this time are shown. In addition, Fig.10 As shown in Figure 1, the power factor of the motor is maintained at 0.88. Under load conditions, the effective working harmonics of the motor include not only the 19th harmonic, but also the 5th, 31st and 43rd harmonics, as shown in Figure 1. Fig.11 This is because the winding magnetomotive force and permanent magnet magnetomotive force, under the modulation of the split teeth and claw poles, jointly enrich the effective working harmonic components in the air gap. Fig.12 and Fig.13 As shown in the magnetic density cloud diagram of the motor core under load, it can be seen that there is oversaturation at the top of the rotor claw pole. However, the magnetic density of most of the rotor claw poles is within a reasonable range, and the performance of the motor still has room for improvement. Therefore, the motor provided in this embodiment can achieve a high power factor and a high torque density working state under load conditions.

[0058] The second embodiment, referring to Fig.14 .

[0059] In this embodiment, the permanent magnet vernier motor is configured as a double-stator claw-pole permanent magnet vernier motor.

[0060] The motor includes two groups of left rotor claw poles, two groups of spoke-type permanent magnets, two groups of stators, two groups of stator windings, two groups of right rotor claw poles and a single annular structure intermediate magnetic ring 5. The intermediate magnetic ring 5 and the two groups of spoke-type permanent magnets arranged in the inner and outer rings are excited in parallel. The two groups of left rotor claw poles and the two groups of right rotor claw poles constitute the inner and outer rotors 8, the two groups of stator windings constitute the inner and outer windings 9, the two groups of stators constitute the inner and outer stators 10, and the two groups of spoke-type permanent magnets constitute the inner and outer permanent magnets 7.

[0061] like Fig.14 The double-stator claw-pole permanent magnet vernier motor can be regarded as a combination of an inner rotor claw-pole permanent magnet vernier motor and an outer rotor permanent magnet vernier motor. The working principle of the motor is the same as that of the parallel magnetic circuit permanent magnet vernier motor described in the first embodiment, but compared with the motor in the first embodiment, the motor design in this embodiment has a higher space utilization rate and can provide a greater torque output in the same volume.

[0062] The third embodiment, referring to Fig.15 .

[0063] In order to reduce the magnetic saturation of the claw pole, this embodiment provides an axial V-shaped claw pole permanent magnet vernier motor. The motor structure includes a stator 3, a stator winding 4, an intermediate magnetic ring 5 and a rotor 11. Fig.15 As shown, the claw poles of the left rotor claw pole and the right rotor claw pole arranged in the rotor 11 are both provided with axial V-shaped pole claws 12, and the claw poles of the left rotor claw pole and the right rotor claw pole are adapted to be plugged into each other.

[0064] Fourth embodiment, reference Fig.16 .

[0065] This embodiment provides an inter-pole unipolar claw-pole permanent magnet vernier motor, including a unipolar excitation method.

[0066] On the basis of the first embodiment, a solution is provided which is different from the technical solution described in the first embodiment in that permanent magnets are arranged between all claw poles of the left rotor claw pole and the right rotor claw pole. Fig.16 As shown, a plurality of permanent magnets are held between the claw poles of the left rotor and the claw poles of the right rotor in an interval-placed manner, the interval is set to be the interval between one claw pole, and the excitation directions of the permanent magnets are the same, and the excitation directions include clockwise and counterclockwise.

[0067] For example, the spoke-type permanent magnets are placed in an intermittent manner. Assuming that the left rotor claw pole and the right rotor claw pole have 38 interpole spaces, 19 permanent magnets are placed in the 38 interpole spaces of the claw pole plate 14, and there is an interpole space 13 between every two permanent magnets. Then, the excitation direction of all the permanent magnets is the same, that is, tangential excitation.

[0068] The fifth embodiment, reference Fig.17 .

[0069] This embodiment provides an unequal air gap claw pole permanent magnet vernier motor.

[0070] like Fig.17 As shown, the structure of the unequal air gap claw pole is that the rotor claw pole and the stator tooth are both configured as wave teeth 15 or saw teeth 16. The wave teeth 15 can be composed of two or more small waves, and the saw teeth 16 also follow the same principle.

[0071] In addition, these wave-shaped teeth 15 or saw-shaped teeth 16 can be arranged on one side or both sides of the rotor claw poles and the stator teeth to form unequal air gaps.

[0072] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A parallel magnetic circuit permanent magnet vernier motor, characterized in that: It includes a left rotor claw pole, a spoke-type permanent magnet, a stator, a stator winding, an intermediate magnetic ring and a right rotor claw pole; The left rotor claw pole, the middle magnetic ring, and the right rotor claw pole are assembled from left to right to form a rotor, and the rotor is assembled with the stator; the left rotor claw pole and the right rotor claw pole are assembled together, and a cavity for placing the middle magnetic ring is formed between the two claw pole disks of the left rotor claw pole and the right rotor claw pole; The spoke-type permanent magnet is composed of a plurality of permanent magnets distributed in an array along a circumference, and a single permanent magnet is held between the claw poles of the left rotor and the claw pole of the right rotor; The spoke-type permanent magnet adopts tangential excitation, and the intermediate magnetic ring adopts axial excitation; the claw pole disks of the left rotor claw pole and the right rotor claw pole are magnetized into N pole and S pole respectively by the intermediate magnetic ring to form a rotor magnetic field; the magnetic flux path of the spoke-type permanent magnet and the magnetic flux path of the intermediate magnetic ring exist in a mutually independent parallel manner; The stator teeth of the stator are arranged as a split tooth structure; the slot-pole matching formula of the motor is: Among them, P w is the number of winding pole pairs of the motor, P m is the number of modulation tooth pole pairs, P r is the number of rotor pole pairs, N s is the number of slots in the motor, N is the number of cracked teeth on a stator tooth; let P r =19,P m =24,P w =5,N s =12, N=2; The magnetic flux path of the intermediate magnetic ring is that the magnetic flux starts from one side of the intermediate magnetic ring, passes through one of the claw poles of the left rotor and the right rotor to enter the air gap space, then passes through the air gap to enter the stator, and enters the air gap again after surrounding the tooth slots of the stator, and finally passes through the other claw pole of the left rotor and the right rotor and returns to the other side of the intermediate magnetic ring, thereby forming a complete closed loop; The magnetic flux path of the spoke-type permanent magnet is that the magnetic flux starts from one of the permanent magnets, first enters the rotor yoke through the claw pole adjacent to the permanent magnet, and then enters the air gap space through another claw pole adjacent to the claw pole disk on the same side as the permanent magnet; then, the magnetic flux enters the stator and surrounds the stator tooth slot, then crosses the air gap again, enters a claw pole of the claw pole disk on the opposite side of the permanent magnet, and finally returns to the other side of the starting permanent magnet, thereby forming a closed loop.

2. A parallel magnetic circuit permanent magnet vernier motor according to claim 1, characterized in that: The permanent magnets are arranged between all the claw poles of the left rotor claw pole and the right rotor claw pole; the excitation directions of two adjacent permanent magnets are opposite.

3. The parallel magnetic circuit permanent magnet vernier motor according to claim 1, characterized in that: A plurality of the permanent magnets are held between the claw poles of the left rotor claw pole and the right rotor claw pole in an interval-placed manner, and the interval is set to be the interval between one claw pole; and the excitation directions of all the permanent magnets are the same.

4. The parallel magnetic circuit permanent magnet vernier motor according to claim 1, characterized in that: The left rotor claw pole, the right rotor claw pole and the stator teeth are all configured as wave teeth or saw-shaped teeth, and the wave teeth or saw-shaped teeth are configured on one side or on both sides.

5. The parallel magnetic circuit permanent magnet vernier motor according to claim 1, characterized in that: The stator winding is configured as a double-layer concentrated winding.

6. The parallel magnetic circuit permanent magnet vernier motor according to claim 1, characterized in that: The claw poles of the left rotor claw pole and the right rotor claw pole are both configured as axial V-shaped pole claws, and the claw poles of the left rotor claw pole and the right rotor claw pole are adapted to be plugged into each other.

7. A parallel magnetic circuit permanent magnet vernier motor according to any one of claims 1 to 6, characterized in that: The permanent magnet vernier motor is a double-stator claw-pole permanent magnet vernier motor; the motor comprises two groups of left rotor claw poles, both of which are arranged in inner and outer rings, two groups of spoke-type permanent magnets, two groups of stators, two groups of stator windings, two groups of right rotor claw poles and a single annular structure intermediate magnetic ring; The middle magnetic ring and the two groups of spoke-type permanent magnets arranged on the inner and outer rings are excited in parallel.

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