CN106602823A - Double-claw-pole-stator magnetic gathering type vernier motor - Google Patents

Abstract

The invention discloses a vernier motor with double-claw pole stator magnetism gathering type, which comprises an inner stator, an outer stator and a rotor. There are multiple grooves in the circumferential direction of the inner wall of the cylinder and the outer wall of the inner stator cylinder. The number of grooves on the two stators is the same. The convex parts between the grooves on the outer stator form the teeth of the outer stator. The protruding parts between the slots form inner stator teeth, which are characterized in that three-phase four-level windings are embedded in the grooves of the two stators, and the inner stator teeth and the outer stator teeth are claw-shaped teeth. The present invention sets double stators, and three-phase four-pole windings are embedded in the grooves of the inner and outer stators, so as to achieve the purpose of magnetic concentration, reduce the magnetic flux leakage of the permanent magnets of the rotor, and improve the utilization rate of the permanent magnets.

Description

A dual-claw-pole stator magnetism-concentrating vernier motor

technical field

The invention relates to a vernier motor, in particular to a vernier motor of a double-claw pole stator magnetic concentration type.

Background technique

Due to its compact structure, high power density and high efficiency, permanent magnet motors have been developed rapidly in recent decades. In the application of low speed and high torque, the direct drive of permanent magnet motor can save the gearbox, eliminate the noise and failure caused by gear meshing transmission, and improve the efficiency and reliability of the system.

However, the use of traditional permanent magnet synchronous motors to achieve the purpose of low-speed high-torque drive has a relatively large volume and unsatisfactory indicators such as torque density. In order to achieve low speed and high torque, researchers currently propose a variety of composite motors based on the combination of permanent magnet motors and new magnetic gears. This type of motor combines the advantages of outer rotor permanent magnet motors and new magnetic gears, greatly improving the output. torque. However, the three-layer air-gap structure of this composite motor brings great difficulties to manufacturing, and its poor running stability limits its practical engineering application.

At present, the permanent magnet vernier motor has attracted widespread attention due to its low-speed and high-torque characteristics. The permanent magnet vernier motor has many advantages in the direct drive system, such as high torque at low speed, high stability and simple operation. Structure. At the same time, the topological structure of this type of motor has the advantages of high power density and simple mechanical structure, and it is expected to be widely used in engineering. However, the traditional permanent magnet vernier motor structure has some problems, such as large cogging torque, low power factor, high operating noise, and low stability.

In the patent CN201210539414, a magnetism-concentrating stator permanent-magnet vernier motor is disclosed. The patent is an outer rotor structure, the end of the stator near the air gap is a stator slot, and each stator tooth end has three virtual teeth and two virtual slots. A radially magnetized permanent magnet and two circumferentially magnetized permanent magnets constitute a permanent magnet unit embedded in the virtual slot. By setting the virtual slot structure, the leakage magnetic flux of the stator teeth of the motor is reduced, and the amount of permanent magnets of the permanent magnet vernier motor is reduced, thereby increasing the output torque and power density of the motor. However, the structure of the permanent magnet vernier motor proposed by the invention does not solve the problems of low power factor and large cogging torque that have always existed in the permanent magnet vernier motor.

Invention patent CN103795159 discloses the structure of the stator-rotor double permanent magnet vernier motor. This structure combines the structural characteristics of the stator permanent magnet vernier motor and the rotor type permanent magnet vernier motor. Permanent magnets are arranged on the surface. The permanent magnets in the stator slots are close to the slots, so the permanent magnets have a greater effect on the air gap magnetic field, and the windings are arranged inside the claw pole slots to increase the torque density of the motor. The permanent magnet motor proposed by the invention reduces magnetic flux leakage, improves the utilization rate of permanent magnets, fully utilizes the fundamental wave and harmonics of the stator winding, and improves the overall torque density of the motor. Compared with the traditional permanent magnet vernier motor, this invention improves the problems of low motor torque density and bulky structure, but still does not solve the problems of high cogging torque and low power factor of the permanent magnet vernier motor.

Contents of the invention

The technical problem to be solved by the present invention is to provide a double-claw pole stator magnetism-concentrating vernier motor that can reduce flux leakage and improve the utilization rate of permanent magnets in view of the shortcomings of the above-mentioned prior art.

The technical solution adopted in the present invention is: a vernier motor with double-claw pole stator and magnetism gathering type, which includes an inner stator, an outer stator and a rotor. The rotor is coaxially set between the two stators, and there is an air gap between the rotor and the inner and outer stators. The rotor is in the shape of a ring, and permanent magnets are arranged on the circumference of the rotor to generate an exciting magnetic field. The outer stator There are multiple grooves in the circumferential direction of the inner wall of the cylinder and the outer wall of the inner stator cylinder. The number of grooves on the two stators is the same. The convex parts between the grooves on the outer stator form the teeth of the outer stator. The protruding parts between the slots form inner stator teeth, which are characterized in that three-phase four-level windings are embedded in the grooves of the two stators, and the inner stator teeth and the outer stator teeth are claw-shaped teeth.

The inner stator teeth and the outer stator teeth are arranged at a certain angle staggered in the circumferential direction.

According to the above technical solution, the inner stator teeth and the outer stator teeth are staggered at an angle of 3.5°-7° in the circumferential direction.

According to the above technical solution, the structure of the inner stator teeth and the outer stator teeth is the same, both of which include a tooth body, and the upper end of the tooth body is provided with a first tooth and a second tooth, and a tooth slot is formed between the first tooth and the second tooth , the first teeth and the second teeth are arranged symmetrically with respect to the tooth grooves.

According to the above technical solution, the inner stator teeth and the outer stator teeth are separated by half a slot pitch angle of 3.5°-7° in the circumferential direction.

According to the above technical solution, a plurality of grooves are uniformly opened on the circumference of the rotor, and the permanent magnets are placed in the grooves.

According to the above technical solution, the air gap between the rotor and the inner and outer stators is 0.4 mm to 0.8 mm.

According to the above technical solution, the radial lengths of the first teeth and the second teeth are equal, and the widths of the first teeth and the slots are the same.

The beneficial effects obtained by the present invention are:

(1) The present invention achieves the purpose of magnetic concentration by setting double stators, and three-phase four-pole windings are embedded in the grooves of the inner and outer stators, so that the magnetic flux leakage of the permanent magnets of the rotor is reduced, and the utilization rate of the permanent magnets is improved;

(2) By staggering the stator teeth of the inner stator and the stator teeth of the outer stator in the circumferential direction by half the slot angle, the power factor is increased from 0.4 to 0.92, which broadens its application range; the torque handling capacity is increased by 240 %; Torque ripple is reduced from 12.7% to 1.31%;

(3) Both stator windings are utilized, and the torque density can be improved.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the three-dimensional structure of the present invention.

Fig. 3 is a schematic diagram of the distribution of magnetic lines of force in the steady state operation of the present invention.

Fig. 4 is a cogging torque diagram of the present invention during operation.

Fig. 5 is an output torque diagram of the present invention during operation.

Fig. 6 is a schematic structural view of the outer stator of the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Fig. 1-2, this embodiment provides a double-claw pole stator magnetism-concentrating vernier motor, which consists of an inner stator 5, an outer stator 4 and a rotor 2 with 22 pole pairs. Both the inner and outer stators are cylindrical and arranged coaxially with the inner and outer sleeves. The inner stator is fixed by the stationary shaft or the frame wall, the outer stator is fixed on the casing, and the two ends are fixed by flanges 7. The rotor 2. The rotor coaxial sleeve 6 is coaxially set between the two stators, and an air gap is provided between the rotor 2 and the inner and outer stators. In the groove, permanent magnets 3 are arranged in the circumferential direction of the rotor to generate an excitation magnetic field and form a 44-pole rotor. There are 12 grooves in the circumferential direction of the inner wall of the outer stator cylinder and the outer wall of the inner stator cylinder. The protrusions between the grooves on the outer stator form outer stator teeth 8, and the protrusions between the grooves on the inner stator The inner stator teeth 9 are partially formed, and three-phase four-stage windings 1 are embedded in the grooves of the two stators. The inner stator teeth 9 and the outer stator teeth 8 are claw-shaped teeth, and the ends of each inner and outer stator teeth are It is stamped into two claw pole structures that regulate the magnetic flux to reduce magnetic leakage. The inner stator teeth 9 and the outer stator teeth 8 have the same structure, and both include a tooth body 10. A first tooth 11 and a second tooth 12 are arranged on the upper end of the tooth body, and a tooth slot is formed between the first tooth and the second tooth. 13 , the first tooth 11 and the second tooth 12 are arranged symmetrically with respect to the tooth groove 13 .

In the present invention, in order to improve the power factor of the motor, the inner stator teeth 9 and the outer stator teeth 8 are arranged at a certain angle staggered in the circumferential direction, preferably 3.5° to 7°, and the inner stator teeth and the outer stator teeth are separated from each other in the circumferential direction Half pitch angle.

The air gap distance between the rotor and the inner and outer stators is 0.4-0.8 mm. The widths of the first teeth and the second teeth are equal, and the widths of the first teeth and the tooth slots are equal. This structure will be beneficial to reduce magnetic flux leakage and optimize the situation of excessive magnetic density and supersaturation of stator yoke poles.

Described motor structure, as shown in Figure 3, its magnetic circuit is by the circumferential permanent magnet through the rotor iron core to the outer stator tooth, then through the outer stator yoke pole to the outer stator tooth slot, because it is a three-phase motor, the magnetic field lines will be in the outer stator Across the three stator slots to form a loop; then through the rotor permanent magnet to the inner stator yoke; finally return to the starting point through the inner stator yoke. Since the inner and outer stators are staggered by a cogging angle, the permanent magnets of the rotor will not directly form a loop on the teeth of the inner and outer stators without passing through the yoke poles of the inner and outer stators. This kind of magnetic circuit that directly forms a loop has a large magnetic flux leakage, which has a great impact on the performance of the motor such as motor power factor, air gap flux density, flux linkage and stator tooth supersaturation.

In the present invention, by setting double stators, three-phase four-pole windings are embedded in the grooves of the inner and outer stators, so as to achieve the purpose of magnetic concentration, reduce the magnetic flux leakage of the permanent magnets of the rotor, and improve the utilization rate of the permanent magnets; The circumferential arrangement of the stator teeth and the stator teeth of the outer stator is staggered by half the slot angle, which increases the power factor from 0.4 to 0.92 and broadens its application range; the torque handling capacity is increased by 240%; the torque ripple is increased from 12.7% Reduced to 1.31% (as shown in Figures 4 and 5).

In addition, the described vernier motor structure satisfies the permanent magnet vernier effect. That is, the number of pole pairs Nr of the permanent magnet of the rotor, the number of slots of the inner and outer stators Ns, and the number of pole pairs of the winding P, satisfy P=Ns±Nr.

Claims (8)

1. a kind of pair of pawl pole stator magneticfocusing vernier motor, including inner stator, external stator and rotor, the inside and outside stator is in Cylindrical shape and coaxial inside and outside socket arrangement, the rotor coaxial is sleeved between two stators, and is set between rotor and inside and outside stator There is air gap, the rotor is in annular, and permanent magnet is disposed with rotor circumference, produces excitation field, the external stator cylinder Inwall is circumferential and inner stator cylinder body outer wall circumferentially offers multiple grooves, and the groove slot number on two stators is identical, on external stator Bossing forms external stator tooth between each groove, and bossing forms inner stator tooth, its feature between each groove on inner stator It is：Three-phase four-level winding is embedded with the groove of two stators, the inner stator tooth and external stator tooth are claw-like tooth.

2. according to claim 1 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：The inner stator tooth and outer Stator tooth stagger in the circumferential certain angle laying.

3. according to claim 2 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：The inner stator tooth and outer Stator tooth staggers in the circumferential 3.5 °～7 ° of angle.

4. according to claim 1 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：The inner stator tooth and outer The structure of stator tooth is identical, including tooth body, in the upper end of tooth body the first tooth and the second tooth, the first tooth and the second tooth is provided with Between form teeth groove, first tooth and the second tooth are arranged symmetrically with respect to teeth groove.

5. according to claim 1 and 2 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：The inner stator tooth With external stator tooth in the circumferential at a distance of half slot-pitch angle.

6. according to claim 1 and 2 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：In rotor circumference Multiple radial grooves are uniformly offered, the permanent magnet is placed in the groove.

7. according to claim 1 and 2 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：The rotor with it is interior The distance between external stator is 0.4mm～0.8mm.

8. according to claim 1 and 2 pair of pawl pole stator magneticfocusing vernier motor, it is characterised in that：First tooth and The width of the second tooth is equal, and the first tooth is consistent with the width of teeth groove.