CN105978199A - Permanent magnetic vernier motor - Google Patents

Abstract

The invention is applicable to the technical field of motor structure and discloses a permanent magnet vernier motor, which includes a stator and a rotor that rotates with the stator. The stator includes a stator core and a stator winding arranged on the stator core. The rotor includes a rotor core and a rotor. The permanent magnet on the rotor core, the stator winding includes the first set of windings and the second set of windings, the first set of windings and the second set of windings operate independently of each other, and the number of pole pairs of the first set of windings is greater or less than that of the second set The number of pole pairs of the winding. The present invention makes full use of the useful harmonic magnetic field in the air gap by adding a set of windings on the basis of the existing single stator core and single stator winding. The space utilization rate and the utilization rate of the motor material are beneficial to improve the torque and power level of the motor, and effectively enhance the system operation reliability and fault-tolerant operation capability of the motor.

Description

Permanent magnet vernier motor

technical field

The invention belongs to the field of motors, in particular to a permanent magnet vernier motor.

Background technique

As a low-speed and high-torque direct-drive motor, permanent magnet vernier motor has broad application prospects in new energy fields such as electric vehicles, wind power generation, and wave power generation. The permanent magnet vernier motor generally includes a rotor core, a permanent magnet, a stator core and a stator winding. The stator core is provided with a magnetic modulation block, which has a magnetic field modulation function. The high-speed design of the hub.

However, the existing permanent magnet vernier motors still have deficiencies in specific applications, which are specifically reflected as follows: the existing permanent magnet vernier motors are generally single-stator iron-core, single-stator winding motors, so it is difficult to make full use of the air gap The rich and useful harmonic magnetic field in the motor makes the torque density of the motor not fully improved, and the space and materials of the motor are not fully utilized. Specifically, in the existing vernier permanent magnet motor with single stator core and single stator winding, the magnetic field of the majority pole logarithm of the rotor is transformed into the magnetic field of the minority pole logarithm of the stator through the magnetic adjustment of the stator teeth, thus realizing the electric motor The high-speed design of the hub; however, this will cause a large amount of harmonic flux to be unused, which limits the further improvement of the torque density of the motor. In addition, with the setting method of single stator core and single stator winding, the motor cannot operate well in the fault state of the stator winding, which seriously affects the continuous and reliable operation of electric vehicles and new energy power generation.

Contents of the invention

The object of the present invention is to overcome at least one disadvantage of the above-mentioned prior art, and provides a permanent magnet vernier motor, which solves the problem of low air gap harmonic field utilization, low torque density, and motor problems in the existing permanent magnet vernier motor. The technical problems of low space utilization, low motor material utilization, and poor reliability of motor fault-tolerant operation.

In order to achieve the above object, the technical solution adopted by the present invention is: a permanent magnet vernier motor, including a stator and a rotor that rotates with the stator, and the stator includes a stator core and a stator winding arranged on the stator core, The rotor includes a rotor core and permanent magnets arranged on the rotor core, the stator winding includes a first set of windings and a second set of windings, the first set of windings and the second set of windings are independent of each other running, and the number of pole pairs of the first set of windings is greater or smaller than the number of pole pairs of the second set of windings.

Optionally, the stator core has several notches spaced along the circumference and close to the rotor, defining the number of pole pairs of the first set of windings as P, and defining the number of pole pairs of the second set of windings The number is N _pm , and the number of the slots is defined as N _s , then there is P=|N _s ±N _pm |.

Optionally, the number of pole pairs of the second set of windings is equal to the number of pole pairs of the rotor.

Optionally, the stator core includes a stator yoke and several stator teeth distributed on the stator yoke at intervals along the circumferential direction, each of the stator teeth includes a tooth neck and a tooth shoe, and any two adjacent A main wire slot is formed between the tooth necks, and several magnetic adjustment blocks are protruded from each tooth shoe, and a said notch is formed between any two adjacent magnetic adjustment blocks, and the first set of windings are distributed in each of the main wire slots, and the second set of windings are distributed in each of the slots.

Optionally, the stator core includes a stator yoke and several protruding teeth distributed on the stator yoke at intervals in the circumferential direction, the protruding teeth are the magnetic adjustment block, the first set of windings and the second Two sets of windings are distributed in each slot.

Optionally, the protruding tooth is a rectangular tooth block, the notch is a rectangular open slot, and the width of the protruding tooth is equivalent to the width of the notch.

Optionally, the stator is located inside the rotor; or, the stator is located outside the rotor.

Optionally, the permanent magnets include several first magnets and several second magnets whose polarities are opposite to those of the first magnets, and each of the first magnets and each of the second magnets alternate along the circumferential direction Distributed on the rotor core.

Optionally, each of the first magnets and each of the second magnets is attached and fixed on the surface of the rotor core; or, each of the first magnets and each of the second magnets is inserted and fixed on the rotor in the iron core; or, each of the first magnets and each of the second magnets is built in the rotor iron core.

Optionally, a plurality of salient poles distributed along the circumferential direction protrude from the rotor core, and the permanent magnets include a plurality of third magnets respectively embedded and installed between two adjacent salient poles.

The permanent magnet vernier motor provided by the present invention is equipped with two sets of windings that can operate independently and have different numbers of pole pairs on one stator core, which is equivalent to the existing single stator core and single stator winding. A set of windings is added to make full use of the useful harmonic magnetic field in the air gap. In this way, the space utilization rate of the motor and the utilization rate of the motor material (especially the utilization of permanent magnets) are effectively improved without increasing the complexity of the motor structure. rate), which in turn helps to increase the torque and power level of the motor. In addition, since the two sets of windings on the stator core can operate independently of each other and have different numbers of pole pairs, the system operation reliability and fault-tolerant operation capability of the motor are effectively enhanced.

Description of drawings

Fig. 1 is a schematic structural diagram of an outer rotor permanent magnet vernier motor provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the stator core in the outer rotor permanent magnet vernier motor provided by Embodiment 1 of the present invention;

Fig. 3 is a schematic structural view of the stator core in the inner rotor permanent magnet vernier motor provided by Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of the expanded structure of the rotor provided by Embodiment 1 of the present invention;

5 is a schematic structural view of the stator core in the outer rotor permanent magnet vernier motor provided by Embodiment 2 of the present invention;

6 is a schematic structural view of the stator core in the inner rotor permanent magnet vernier motor provided by Embodiment 2 of the present invention;

Fig. 7 is a schematic diagram of the expanded structure of the rotor provided by Embodiment 3 of the present invention;

Fig. 8 is a schematic diagram of the expanded structure of the rotor provided by Embodiment 4 of the present invention;

Fig. 9 is a schematic diagram of the expanded structure of the rotor provided by Embodiment 5 of the present invention.

The arrows on the permanent magnets in Fig. 4, Fig. 7, Fig. 8 and Fig. 9 indicate the magnetization direction of the magnet.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or there may be an intervening element at the same time. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

It should also be noted that the orientation terms such as left, right, up, down, top, and bottom in the following examples are only relative concepts or refer to the normal use status of the product, and should not be regarded as having restrictive.

Embodiment one:

As shown in Figures 1-4, the permanent magnet vernier motor provided by Embodiment 1 of the present invention includes a stator 1 and a rotor 2 that rotates with the stator 1. The stator 1 includes a stator core 11 and a stator set on the stator core 11. Winding 12, the rotor 2 includes a rotor core 21 and a permanent magnet 22 disposed on the rotor core 21, the stator winding 12 includes a first set of windings 121 and a second set of windings 122, the first set of windings 121 and the second set of windings 122 They operate independently of each other, and the number of pole pairs of the first set of windings 121 is greater than or smaller than that of the second set of windings 122 , that is, the number of pole pairs of the first set of windings 121 and the number of pole pairs of the second set of windings 122 are not equal. Both the first set of windings 121 and the second set of windings 122 can be single-phase windings or multi-phase windings (such as three-phase windings, etc.). The permanent magnet vernier motor provided by the embodiment of the present invention is specifically a motor with a single stator core 11 and double stator windings 12, which is equivalent to adding a motor on the basis of the existing single stator core 11 and single stator winding 12. The windings are used to make full use of the useful harmonic magnetic field in the air gap (the gap between the rotor 2 and the stator 1), so as to achieve the purpose of making full use of the effective harmonic magnetic field in the air gap of the permanent magnet vernier motor. In this way, without increasing the motor structure Under the premise of complexity, the space utilization rate of the motor and the utilization rate of the motor material (especially the utilization rate of the permanent magnet 22 ) are effectively improved, which is conducive to improving the torque and power level of the motor. In addition, since the two sets of windings on the stator core 11 can operate independently of each other and have different numbers of pole pairs, the system operation reliability and fault-tolerant operation capability of the motor are effectively enhanced.

Preferably, the stator core 11 has several notches 1101 spaced along the circumference and close to the rotor 2, defining the number of pole pairs of the first set of windings 121 as P, and defining the number of pole pairs of the second set of windings 122 as N _pm , define the number of notches 1101 as N _s , then P=|N _s ±N _pm |. The number of notches 1101 can be reasonably selected according to the phase number, rotational speed, modulation ratio, etc. of the designed motor. Here, by optimizing the relationship between the number of pole pairs P of the first set of windings 121, the number of pole pairs N _pm of the second set of windings 122, and the number N _s of slots 1101, the magnetic circuit structure of the motor can be utilized to maximize the The effective harmonic magnetic field is improved, and the unusable harmonic magnetic field can be suppressed, so that the amplitude of the obtained harmonic magnetic field is optimal.

Preferably, the number of pole pairs of the second set of windings 122 is equal to the number of pole pairs of the rotor 2. In this way, it is beneficial to make full use of the useful harmonic magnetic field in the air gap of the motor, thereby helping to improve the space utilization rate, material utilization rate and rotational speed of the motor. moment density.

Preferably, referring to FIGS. 1-3 together, the stator core 11 includes a stator yoke 111 and several stator teeth 112 spaced along the circumferential direction. Each stator tooth 112 includes a tooth neck 1121 and a tooth shoe 1122. The stator The yoke 111 is a circumferentially closed annular structure, the stator teeth 112 protrude from the inside or the outside of the stator yoke 111, and the tooth neck 1121 is located between the stator yoke 111 and the tooth shoe 1122, and any two adjacent tooth necks 1121 are A main line groove 1102 is formed, and several magnetic modulation blocks 1123 protrude from each tooth shoe 1122. The magnetic modulation blocks 1123 have a magnetic field modulation function, and a notch 1101 is formed between any two adjacent magnetic modulation blocks 1123. One set of windings 121 is distributed in each main slot 1102 , the second set of windings 122 is distributed in each slot 1101 , and the first set of windings 121 and the second set of windings 122 are distributed inwardly and outwardly along the radial direction of the stator core 11 . The number of notches 1101 is equal to the number of magnetic adjustment blocks 1123 , and the number of main slots 1102 is equal to the number of tooth necks 1121 . Here, the stator 1 is a split-pole stator structure. In the existing split-pole stator structure, only one set of windings is arranged in the main wire slot 1102, which utilizes the magnetic field modulation effect of the magnetic modulation block 1123 to make most pole pairs of the rotor 2 The digital magnetic field is converted into a small number of pole logarithmic magnetic fields of the stator 1, thereby realizing the high-speed design of the armature; in this embodiment, on the basis of the existing split-pole stator structure, a second set of windings 122 is added in the slot 1101 to fully Utilizing the useful harmonic magnetic field in the air gap, the torque density of the motor can be increased, and the fault-tolerant operation capability of the motor can be effectively improved.

Specifically, due to the limited slot space, in order to make full use of the slot space, the wires of the stator winding 12 can be optimally designed to meet the slot shape, and the rectangular wire scheme can be used to reduce the waste of slot space and improve slot utilization.

Specifically, referring to Fig. 1 and Fig. 2 together, the permanent magnet vernier motor provided by this embodiment may have the structure of outer rotor 2 and inner stator 1, that is, the stator 1 is located inside the rotor 2, at this time, the notch 1101 Located outside the main slot 1102 in the radial direction of the stator core 11, the second set of windings 122 is located outside the first set of windings 121 in the radial direction of the stator core 11; or, referring to FIG. 3 , the present embodiment provides The permanent magnet vernier motor can also be the structure of the inner rotor 2 and the outer stator 1, that is, the stator 1 is located on the outside of the rotor 2. At this time, the notch 1101 is located on the inner side of the main wire groove 1102 along the radial direction of the stator core 11, and the second set The winding 122 is located inside the first set of winding 121 along the radial direction of the stator core 11 .

Preferably, referring to Fig. 1 and Fig. 4 together, the permanent magnet 22 includes several first magnets 221 and several second magnets 222 whose polarities are opposite to those of the first magnets 221, the first magnets 221 and the second The polarities of the magnets 222 are respectively N pole and S pole, and each first magnet 221 and each second magnet 222 are alternately distributed on the rotor core 21 along the circumferential direction. The first magnets 221 and the second magnets 222 can be formed by magnetizing in the radial direction of the motor. Here, the first magnets 221 and the second magnets 222 are alternately arranged in an N-S alternating magnetization structure along the circumferential direction of the air gap of the motor. The magnetic flux density in the gap is close to a sinusoidal distribution.

Preferably, each of the first magnets 221 and each of the second magnets 222 are alternately distributed on the rotor core 21 along the circumferential direction, so as to facilitate the respective magnetization of the first magnets 221 and the second magnets 222 .

Preferably, the pole distance between the first magnet 221 and the second magnet 222 is slightly larger than the width of the magnetic modulation block 1123 , so that the magnetic modulation effect can be better exerted.

Preferably, as shown in FIG. 4 , the first magnets 221 and the second magnets 222 are attached and fixed on the surface of the rotor core 21, so that the first magnets 221 and the second magnets 222 can be effectively formed on the rotor core 21. The installation on the rotor is fixed, and each first magnet 221 and each second magnet 222 protrude from the surface of the rotor core 21 . Specifically, when the motor has the structure of the outer rotor 2 and the inner stator 1, each first magnet 221 and each second magnet 222 are attached and fixed on the inner circumferential surface of the rotor core 21; In the structure of the stator 1 , each first magnet 221 and each second magnet 222 are adhered and fixed on the outer circumferential surface of the rotor core 21 . In this embodiment, each first magnet 221 and each second magnet 222 are fixed on the rotor core 21 by surface attachment, and the installation structure is simple, and neither the rotor core 21 nor the permanent magnet 22 needs to be provided with an installation structure. The operation is convenient and facilitates the radial magnetization of each first magnet 221 and each second magnet 222, thereby forming an N-S alternating magnet structure distributed along the circumferential direction.

Preferably, the stator core 11 and the rotor core 21 are respectively made of magnetically permeable materials such as silicon steel sheets laminated along the axial direction of the motor, which has a simple structure and is easy to manufacture. Of course, in a specific application, the stator core 11 and the rotor core 21 may also be directly integrally cast using magnetically permeable materials.

The permanent magnet vernier motor provided in this embodiment is specifically a permanent magnet vernier motor with a single stator core 11 and double windings, which has the dual advantages of a permanent magnet vernier motor and a double winding motor. In specific applications, according to actual needs, The permanent magnet vernier motor of this embodiment can be designed as a high torque density motor or a high fault tolerance motor by optimizing the slot space of the stator 1 to respectively install two sets of windings. Since the two sets of windings in this embodiment correspond to different air-gap harmonic magnetic fields, it effectively improves the utilization rate of the air-gap harmonic magnetic field of the motor, reduces the magnetic flux leakage of the motor, improves the torque density of the motor, and Space utilization and motor material utilization.

Embodiment two:

As shown in Figures 5 and 6, the main difference between the permanent magnet vernier motor provided in this embodiment and the first embodiment is that the stator 1 in the first embodiment is a split-pole stator structure, and the first set of windings 121 and The second set of windings 122 are distributed inside and outside along the radial direction of the stator core 11; while the stator 1 in this embodiment is an open slot stator structure, specifically, the stator core 11 in this embodiment includes a stator yoke 111 and several Two protruding teeth 113 are distributed on the stator yoke 111 at intervals along the circumferential direction. The stator yoke 111 is a circumferentially closed annular structure. A notch 1101 is formed between them, and the first set of windings 121 and the second set of windings 122 are distributed in each notch 1101 . In this embodiment, the first set of windings 121 and the second set of windings 122 share the same slot space, except that the first set of windings 121 and the second set of windings 122 correspond to windings with a large number of pole pairs and windings with a small number of pole pairs respectively , in specific applications, the slot space of the first set of windings 121 and the second set of windings 122 can be reasonably allocated according to the different focus points of the designed motor performance. One set of them is designed as a centralized winding, and the other is designed as a distributed winding, and the distribution space of the centralized winding is more, and the distribution space of the distributed winding is less; for motors that need to output large torque in a short time, two sets of One set of windings is designed as the main winding, and the other set is designed as the auxiliary winding, and the slot space for installing the main winding is larger than the slot space for the auxiliary winding; for occasions that require fault-tolerant operation, the two sets of windings can equally divide the slot space. The permanent magnet vernier motor provided by this embodiment also adds a second set of windings 122 in the notch 1101 to make full use of the useful harmonic magnetic field in the air gap, thereby also improving the space utilization rate, material utilization rate, and torque of the motor. Density and fault-tolerant operation.

Preferably, the protruding tooth 113 is a rectangular tooth block, the notch 1101 is a rectangular open slot, and the width of the protruding tooth 113 is equivalent to the width of the notch 1101 , that is, the protruding tooth 113 and the notch 1101 are of equal width. The width of the protruding tooth 113 specifically refers to the projected distance of the protruding tooth 113 in the circumferential direction of the stator core 11 , and the width of the slot 1101 specifically refers to the projected distance of the notch 1101 in the circumferential direction of the stator core 11 . Each protruding tooth 113 can form a protruding pole body structure, which can play the role of magnetic field modulation, thereby forming a harmonic magnetic field of the air gap.

Except for the above differences, other structures of the permanent magnet vernier motor provided in this embodiment can be optimally designed with reference to Embodiment 1, and will not be described in detail here.

Embodiment three:

As shown in FIG. 7 , the main difference between the permanent magnet vernier motor provided in this embodiment and the first and second embodiments is that the first magnet 221 and the second magnet 222 are installed in different ways. Specifically, in Embodiment 1 and Embodiment 2, each first magnet 221 and each second magnet 222 are attached and fixed on the surface of the rotor core 21, and each first magnet 221 and each second magnet 222 are exposed on the The surface of the rotor core 21; and in the present embodiment, each first magnet 221 and each second magnet 222 are inserted and fixed in the rotor core 21, and the surface of the rotor core 21 is provided with several magnets for each first magnet respectively. The magnets 221 and the second magnets 222 are inserted into the fixed installation slots, and only one surface of each first magnet 221 and each second magnet 222 is flush with the surface of the rotor core 21 . Specifically, when the motor has the structure of the outer rotor 2 and the inner stator 1, the mounting grooves are recessed on the inner surface of the rotor core 21 at intervals along the circumferential direction, and the first magnets 221 and the second magnets 222 are respectively inserted and fixed in the inner surface of the rotor core 21. In each mounting groove of the rotor core 21, each first magnet 221 and each second magnet 222 have a surface flush with the inner surface of the rotor core 21; Each mounting groove is recessed on the outer surface of the rotor core 21 at intervals along the circumferential direction, and each first magnet 221 and each second magnet 222 are respectively inserted into and fixed in each mounting groove of the rotor core 21, and each first magnet 221 and each The second magnets 222 all have surfaces flush with the outer surface of the rotor core 21 . By adopting the installation method of the first magnet 221 and the second magnet 222 in this embodiment, the installation and fixation of the first magnet 221 and the second magnet 222 can also be effectively realized, and an N-S alternating magnet structure distributed along the circumferential direction can be formed.

In addition to the above differences, other structures of the permanent magnet vernier motor provided in this embodiment can be optimally designed with reference to Embodiment 1 and Embodiment 2, and will not be described in detail here.

Embodiment four:

As shown in FIG. 8 , the main difference between the permanent magnet vernier motor provided by this embodiment and the first, second and third embodiments is that the first magnet 221 and the second magnet 222 are installed in different ways. Specifically, in Embodiment 1 and Embodiment 2, each first magnet 221 and each second magnet 222 are attached and fixed on the surface of the rotor core 21, and each first magnet 221 and each second magnet 222 are exposed on the The surface of the rotor iron core 21; in the third embodiment, each first magnet 221 and each second magnet 222 are inserted and fixed in the rotor iron core 21, and each first magnet 221 and each second magnet 222 have only one surface that is in contact with the rotor iron core. The surface of the core 21 is even; and in the present embodiment, each first magnet 221 and each second magnet 222 are built in the rotor core 21, and each first magnet 221 and each second magnet 222 are completely embedded in the rotor core 21 In other words, each of the first magnets 221 and each of the second magnets 222 has no surface flush with the surface of the rotor core 21 . By adopting the installation method of the first magnet 221 and the second magnet 222 in this embodiment, the installation and fixation of the first magnet 221 and the second magnet 222 can also be effectively realized, and an N-S alternating magnet structure distributed along the circumferential direction can be formed.

In addition to the above differences, other structures of the permanent magnet vernier motor provided in this embodiment can be optimally designed with reference to Embodiment 1 and Embodiment 2, and will not be described in detail here.

Embodiment five:

As shown in FIG. 9 , the main difference between the permanent magnet vernier motor provided by this embodiment and the first, second, third and fourth embodiments lies in the arrangement of the permanent magnets 22 . Specifically, in Embodiment 1, Embodiment 2, Embodiment 3 and Embodiment 4, the permanent magnet 22 includes a first magnet 221 and a second magnet 222 with opposite polarities; and in this embodiment, the permanent magnet 22 only includes A third magnet 223 having the same polarity. Specifically, in this embodiment, the rotor core 21 is provided with several salient poles 211 spaced apart along the circumferential direction, and the permanent magnet 22 includes several third poles 211 respectively embedded and installed between two adjacent salient poles 211. magnet 223 . Between any two adjacent salient poles 211 is formed a slot for the third magnet 223 to be inserted and installed. After the third magnet 223 is embedded and mounted on the rotor core 21, each salient pole 211 will be magnetized by the third magnet 223 into a magnet whose polarity is opposite to that of the third magnet 223, that is, the connection between the third magnet 223 and the rotor core 21. The polarities are respectively N pole and S pole. In this way, the salient poles 211 on the rotor core 21 can be used to realize the circumferential alternating distribution with the third magnet 223. In this way, both permanent magnets 22 can be realized on the rotor core 21. The installation is fixed, and the N-S alternating magnet structure distributed along the circumference can be formed.

In addition to the above differences, other structures of the permanent magnet vernier motor provided in this embodiment can be optimally designed with reference to Embodiment 1 and Embodiment 2, and will not be described in detail here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. permanent magnetism vernier motor, including stator and the rotor that coordinates with described stator rotation, described stator includes Stator core and the stator winding being located on described stator core, described rotor includes rotor core and is located at institute State the permanent magnet on rotor core, it is characterised in that: described stator winding includes first set winding and the second set Winding, described first set winding and the described second set separate operation of winding, and described first set winding Number of pole-pairs is more than or less than the number of pole-pairs of described second set winding.

2. permanent magnetism vernier motor as claimed in claim 1, it is characterised in that: if described stator core has The notch of dry circumferentially spaced and close described rotor, the number of pole-pairs defining described first set winding is P, the number of pole-pairs defining described second set winding is N_pm, the quantity defining described notch is N_s, then there is P=| N_s ±N_pm|。

3. permanent magnetism vernier motor as claimed in claim 2, it is characterised in that: the pole of described second set winding Logarithm is equal with the number of pole-pairs of described rotor.

4. permanent magnetism vernier motor as claimed in claim 2 or claim 3, it is characterised in that: described stator core bag Include stator yoke and several circumferentially spaced stator tooths in described stator yoke, each described stator tooth All include tooth neck and tooth boots, all form a main line groove described in arbitrary neighborhood two between tooth neck, on each tooth boots All it is convexly equipped with several adjustable magnetic blocks, described in arbitrary neighborhood two, between adjustable magnetic block, all forms a described notch, institute Stating first set winding to be distributed in each described main line groove, described second set winding is distributed in each described notch.

5. permanent magnetism vernier motor as claimed in claim 2 or claim 3, it is characterised in that: described stator core bag Include stator yoke and several circumferentially spaced double wedges in described stator yoke, convex described in arbitrary neighborhood two All form a described notch, described first set winding and described second set winding between tooth and be distributed in each described In notch.

6. permanent magnetism vernier motor as claimed in claim 5, it is characterised in that: described double wedge is rectangular teeth block, Described notch is rectangular aperture groove, and the width of described double wedge is suitable with the width of described notch.

7. the permanent magnetism vernier motor as described in any one of claims 1 to 3, it is characterised in that: described stator It is positioned at the inner side of described rotor；Or, described stator is positioned at the outside of described rotor.

8. the permanent magnetism vernier motor as described in any one of claims 1 to 3, it is characterised in that: described permanent magnetism Body includes the second magnet that several first magnets and several polarity are contrary with described first magnet polarity, respectively Described first magnet and each described second magnet is circumferentially alternating is distributed on described rotor core.

9. permanent magnetism vernier motor as claimed in claim 8, it is characterised in that: each described first magnet is with each Described second magnet attaches the surface being fixed on described rotor core；Or, each described first magnet and each institute State the second magnet to be inserted and fixed in described rotor core；Or, each described first magnet and each described second Magnet is built in described rotor core.

10. the permanent magnetism vernier motor as described in any one of claims 1 to 3, it is characterised in that: described turn Being convexly equipped with several circumferentially spaced salient poles on sub-iron core, described permanent magnet includes that several are the most embedding Enter the 3rd magnet being installed on described in each adjacent two between salient pole.