CN204721115U - A kind of stator structure of double-rotor radial magnetic field permanent magnet motor - Google Patents

Abstract

The stator structure of the double-rotor radial magnetic field permanent magnet motor of the utility model includes a stator yoke, a stator tooth, a stator winding slot, a stator winding, and a rectangular auxiliary slot arranged in the middle of the tooth top of the stator which cooperates with each other. By adjusting the distribution of the stator winding slots along the inner and outer circumferences of the stator core, the phase relationship of the cogging torque generated by the inner and outer parts of the motor is changed, and the effect of mutual cancellation between the two can be achieved, and each stator tooth top is specially A rectangular auxiliary slot is added in the middle to increase the order of the lowest harmonic of the cogging torque. On the whole, the cogging torque ripple of the motor is reduced, and the working efficiency and stability of the motor are improved.

Description

Stator structure of a double-rotor radial field permanent magnet motor

technical field

The utility model relates to a stator structure of a double-rotor radial magnetic field permanent magnet motor, which is especially suitable for driving systems of various high-efficiency and energy-saving industrial sectors.

Background technique

The structure of the double rotor permanent magnet motor is composed of an inner rotor permanent magnet motor and another outer rotor permanent magnet motor, both of which share the same stator. The magnetic field direction of the double-rotor radial field permanent magnet motor is perpendicular to the rotating shaft, which is different from the axial field motor. (Without special instructions, the dual-rotor permanent magnet motor mentioned below refers specifically to the dual-rotor radial field permanent magnet motor). The double-rotor permanent magnet motor especially has high power density and torque density. Therefore, under the premise of using relatively cheap permanent magnet materials such as ferrite to reduce manufacturing costs, it can still ensure that the motor has a relatively high efficiency and output torque. This feature of the dual-rotor permanent magnet motor makes its future development can largely alleviate the contradiction between the manufacturing cost and performance of the permanent magnet motor.

Analogous to the traditional single-rotor motor, the inherent cogging structure on the stator of the dual-rotor permanent magnet motor interacts with the permanent magnets of the inner and outer rotors respectively, and the fluctuation of the tangential component of the generated force will inevitably cause cogging torque ( The cogging torque is synthesized by the inner and outer parts), which reduces the smoothness of the motor output torque, increases noise and vibration, and seriously affects the positioning accuracy and servo performance of the motor.

Utility model content

The utility model aims at the deficiencies of the prior art, and proposes a stator structure of a double-rotor permanent magnet motor. By changing the structure of the stator cogging, the suppression of the cogging torque is realized, and the working efficiency and the efficiency of the motor are improved. stability. The special structure of the double-rotor permanent magnet motor determines that the total cogging torque is composed of the inner and outer parts of the cogging torque. By changing the phase relationship between the inner and outer parts of the torque, the effect of mutual cancellation between the two parts can be realized. Then the total cogging torque of the motor can be reduced to a certain extent.

In order to achieve the above technical goals, the utility model proposes a stator structure of a double-rotor permanent magnet motor, including a stator yoke, stator teeth, stator winding slots, stator windings, and a rectangular auxiliary set in the middle of the stator teeth that cooperate with each other. groove. The stator winding slots respectively include a plurality of winding slots (outer slots) uniformly arranged along the outer circumference of the iron core, and a plurality of winding slots (inner slots) evenly arranged along the inner circumference of the iron core. The uniform distribution of the stator winding slots along the circumference of the iron core forms the stator teeth, wherein the uniform distribution of the outer slots forms the outer surface stator teeth, and the uniform distribution of the inner slots forms the inner surface stator teeth. The stator windings are distributed in a ring shape and wound in the inner and outer slots of the stator, that is, the two effective sides of each coil are respectively placed in the inner and outer slots, so that the length of the end of the winding can be shortened to the greatest extent, and the leakage reactance of the end can be reduced. Improve efficiency.

The utility model transforms the distribution of the stator winding slot along the inner and outer circumference of the stator core, and makes it into a structure in which the center line of the outer slot and the center line of the inner slot are no longer located in the same radial direction, that is, the formed outer surface The stator teeth and the stator teeth on the inner surface are completely dislocated along the circumference of the iron core, and a rectangular auxiliary slot is specially added in the middle of each stator tooth top.

Further, the centerline of the outer groove under the structure and the centerline of the corresponding stator teeth on the inner surface will be located in the same radial direction; the centerline of the inner groove under the structure and the centerline of the corresponding outer surface stator teeth will be located in the same radial direction superior.

Further, the rectangular auxiliary slot has one in the middle of each stator tooth top, the depth of the auxiliary slot generally does not exceed 1/10 of the depth of the stator wire slot where it is located, and the slot width of the auxiliary slot generally does not exceed the width of the stator tooth where it is located. 1/5 of the width.

The beneficial effects of the utility model are: (1) The stator structure of the traditional double-rotor permanent magnet motor is such that the centerlines of the inner and outer grooves are located in the same radial direction, causing the phases of the cogging torques of the inner and outer parts of the motor to be consistent, so that the two parts of the teeth The magnitude of the total cogging torque caused by the superposition of slot torques is greater than any part of them; with the stator structure described in this patent, since the centerlines of the inner and outer slots are no longer radially aligned, on the contrary their respective The center line is radially aligned with the center line of the corresponding stator tooth on the other circumferential surface, so the phases of the inner and outer parts of the cogging torque will theoretically differ by 180 degrees, and the total cogging torque after superposition will be less than Any part of them improves the performance of the motor; (2) Since there are rectangular auxiliary slots in the middle of the stator tooth tops on the inner and outer surfaces, the lowest harmonic order of the cogging torque can be increased, thereby reducing the inner and outer teeth at the same time. The magnitude of the cogging torque can further achieve the effect of weakening the total cogging torque.

Description of drawings

Fig. 1 is the example schematic diagram of the stator structure of double-rotor permanent magnet motor of the present utility model;

Fig. 2 is the partial schematic diagram of the stator cogging of the dual-rotor permanent magnet motor of the present invention;

Fig. 3 is a schematic diagram of the connection of stator windings and coils of the double-rotor permanent magnet motor of the present invention.

In the figure, 1, rotating shaft; 2, stator yoke; 3, outer surface stator teeth; 4, inner surface stator teeth; 5, stator outer slot; 6, stator inner slot; 7, rotor pole; 8, stator winding; 9 , Rectangular auxiliary slot; 10, Two effective sides of a coil of the stator winding.

Detailed ways

Below in conjunction with the example in the accompanying drawings the utility model is further described.

With reference to shown in Fig. 1, the stator structure of the dual-rotor permanent magnet motor of the present utility model, take the stator structure of the dual-rotor permanent magnet motor of 3 phases 24 slots as an example, it consists of stator yoke 2, outer surface stator teeth 3, inner The surface consists of stator teeth 4, stator outer slots 5, stator inner slots 6, stator windings 8, and rectangular auxiliary slots 9.

The center line of the stator outer slot 5 and the center line of the stator inner slot 6 are no longer in the same radial direction, that is, the formed outer surface stator teeth 3 and the inner surface stator teeth 4 are completely misaligned along the circumference of the stator core distributed.

There is one rectangular auxiliary slot 9 in the middle of each stator tooth top.

Referring to Figure 2, the centerline of the stator outer slot 5 and the centerline of the corresponding inner surface stator teeth 4 will be located in the same radial direction; the centerline of the stator inner slot 6 and the center of the corresponding outer surface stator teeth 3 The lines will lie in the same radial direction. The slot depth of the auxiliary slot 9 generally does not exceed 1/10 of the depth of the stator wire slot where it is located, and the slot width of the auxiliary slot 9 generally does not exceed 1/5 of the stator tooth width where it is located.

Referring to FIG. 3 , the two effective sides 10 of one coil of the stator winding are respectively placed in the outer slot and the inner slot of the stator.

Claims (3)

1. a double-rotor radial magnetic field permanent magnet motor stator structure, is characterized in that: it comprises stator yoke (2), outer surface stator tooth (3), inner surface stator tooth (4), stator water jacket (5), stator inside groove (6), stator winding (8), rectangle auxiliary tank (9); Described stator water jacket (5) center line and described stator inside groove (6) center line are no longer positioned on same radial direction, namely formed described in outer surface stator tooth (3) and described inner surface stator tooth (4) be dislocatedly distributed completely along stator core circumference.

2. double-rotor radial magnetic field permanent magnet motor stator structure according to claim 1, is characterized in that: described stator water jacket (5) center line and the center line of inner surface stator tooth (4) corresponding to it will be positioned on same radial direction; Described stator inside groove (6) center line and the center line of outer surface stator tooth (3) corresponding to it will be positioned on same radial direction.

3. double-rotor radial magnetic field permanent magnet motor stator structure according to claim 1, it is characterized in that: described rectangle auxiliary tank (9) is for having one in the middle part of each stator tooth top, the groove depth of auxiliary tank be generally no more than its be positioned at 1/10 of the stator slot degree of depth, the groove width of auxiliary tank be generally no more than its be positioned at 1/5 of the stator facewidth.