CN217522644U

CN217522644U - Novel stator and rotor structure of hybrid excitation asynchronous starting permanent magnet synchronous motor

Info

Publication number: CN217522644U
Application number: CN202123174854.6U
Authority: CN
Inventors: 戈宝军; 张梦娜; 范家成
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-09-30
Anticipated expiration: 2031-12-16

Abstract

The utility model relates to a novel mixed excitation asynchronous starting PMSM decides rotor structure belongs to motor structure technical field. The utility model discloses motor body includes the stator, the rotor magnetic pole, the damping strip, the magnetism separation cover, the permanent magnet, adopt the stator outside, the motor structure of 30 utmost point 108 grooves including the rotor, the stator comprises stator tooth and stator yoke, the tooth top position is equipped with the magnet adjusting block, multiplicable motor torque density shortens motor start time, the rotor magnetic pole is according to the equidistant distribution of circumference at the stator inboard, all be equipped with 4 built-in permanent magnets of piece between each magnetic pole, 1 table pastes formula permanent magnet is equipped with at rotor magnetic pole top, can make motor eddy current loss reduce, weaken air gap magnetic density harmonic amplitude, open the magnetic pole bottom has the rectangle notch, can make the motor tangential magnetic density reduce, increase motor radiating effect simultaneously.

Description

Novel stator and rotor structure of hybrid excitation asynchronous starting permanent magnet synchronous motor

Technical Field

The utility model relates to a motor structure technical field, a novel mixed excitation asynchronous starting PMSM decides rotor structure.

Background

The asynchronous starting permanent magnet synchronous motor is characterized in that a permanent magnet is placed on an iron core of a three-phase induction motor, and the starting is realized by means of asynchronous torque generated by a squirrel-cage rotor winding; compared with a three-phase induction motor, the asynchronous starting permanent magnet synchronous motor has the outstanding advantages of high efficiency, high power factor and wider economic range; china is a big rare earth country, the rare earth permanent magnet yield is the first world with rich rare earth resources, and the permanent magnet synchronous motor has great advantages for the vigorous development of the permanent magnet synchronous motor.

The permanent magnet synchronous motor can be divided into a surface-mounted type and a built-in type according to the rotor structure, the torque pulsation of the surface-mounted type permanent magnet synchronous motor is relatively small, the power density is relatively low, the overload capacity and the output torque of the built-in type permanent magnet synchronous motor are both large, but the leakage flux of the built-in type permanent magnet synchronous motor is large, the sine type of the air gap flux density of the motor is poor, the harmonic content is high, so that the structure improvement of the existing asynchronous starting permanent magnet synchronous motor is necessary.

Disclosure of Invention

The utility model provides a problem provide an improve stator-rotor structure to improve asynchronous starting PMSM performance.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a novel asynchronous starting PMSM structure of hybrid excitation which characterized in that, the motor body includes stator, accent magnet piece, rotor magnetic pole, damping strip, magnetic shield and a plurality of first permanent magnet and second permanent magnet.

In the scheme, the magnet adjusting block is positioned at the tooth top of the stator and is combined with the stator teeth of the motor to form the stator core.

In the scheme, the magnetic isolation sleeve is adopted between the rotor magnetic pole and the rotating shaft, four round holes with the radius of 5mm are formed in the top of the rotor magnetic pole and used for placing damping strips, four equal-size rectangular ventilation grooves are formed in the bottom of the rotor magnetic pole, three equal-size rectangular filler grooves are formed in two sides of the rotor magnetic pole respectively, and the rectangular grooves between every two adjacent magnetic poles are symmetrically distributed.

In the scheme, the first permanent magnets are built-in, each pole is 4, the sections of the permanent magnets are square and have the same area, the permanent magnets are placed between two adjacent rotor magnetic poles, and the permanent magnets are separated by fillers.

In the above scheme, the second permanent magnet is the surface mounting formula, and every utmost point quantity is 1, and the permanent magnet is the arc for the bottom, can closely laminate and length equals with the rotor magnetic pole, and the first plane of permanent magnet and second plane all form the fillet that the radius is 5mm with the top.

In the scheme, the filler grooves between two adjacent rotor magnetic poles are symmetrically distributed, and aluminum alloy fillers are placed in the grooves.

By the technical scheme, the permanent magnet synchronous motor obtains good running characteristics, the torque density of the motor can be increased by adding the magnet adjusting pieces at the tooth parts of the stator, and the starting time is shortened; the bottom of the rotor magnetic pole is provided with a ventilation groove, so that air flow in the motor can be enhanced, heat dissipation of the rotor magnetic pole is facilitated, the radial direction of the ventilation groove is longer than the tangential direction, and tangential magnetic flux density and magnetic flux leakage of the motor can be reduced; the built-in permanent magnet is in a sectional type, a fillet exists between the top of the surface-mounted permanent magnet and the first plane and the second plane, the eddy current loss of the permanent magnet can be effectively reduced by the two modes, and meanwhile, the air gap flux density waveform of the surface-mounted and built-in hybrid motor is better in sine type, and the cogging torque is smaller; for the motor manufacturing process, the method is easy to magnetize, the parameter adjustability is higher, and the method is of great significance for the optimized design of the asynchronous starting permanent magnet synchronous motor.

Drawings

Fig. 1 is a schematic structural diagram of a stator and a rotor of a novel hybrid excitation asynchronous starting permanent magnet synchronous motor.

As shown in fig. 1: 1 rotor bracket, 2 magnet adjusting blocks, 3 rotor magnetic poles, 4 magnetic isolation sleeves and 5 stator iron cores.

Fig. 2 is an enlarged schematic view of the rotor magnetic pole.

As shown in fig. 2: 6 permanent magnet first plane, 7 damping strips, 8 permanent magnet second plane, 9 first permanent magnet, 10 second permanent magnet, 11 filler groove, 12 rotor ventilation groove.

Fig. 3 is a schematic view of a magnetic circuit of a rotor magnetic pole during the operation of the motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the asynchronous starting permanent magnet synchronous motor with 30 poles and 108 slots is designed, the structure of the motor is that a stator is arranged outside, a rotor is arranged inside, and windings are double-layer windings and are arranged on teeth of the stator; a magnetic isolation sleeve is arranged between the rotor magnetic pole and the rotating shaft, and four round holes with the radius of 5mm are formed in the top of the rotor magnetic pole and used for placing damping strips, so that the self-starting function of the motor is realized.

Referring to fig. 1, for a stator: the magnet adjusting block is arranged on each stator tooth top, so that the motor stator teeth can be converted into magnetic teeth, the motor torque density can be increased, and the starting time can be shortened.

Referring to fig. 2, for a rotor: two sides of the magnetic pole of the rotor are respectively provided with three equal-size rectangular aluminum alloy filler grooves, the rectangular grooves between two adjacent magnetic poles are symmetrically distributed, and the first permanent magnet is placed between the two filler plates, so that the permanent magnet can be firmly installed, and the mechanical strength is high. Four equal-size rectangular ventilation grooves are formed in the bottom of the magnetic pole of the rotor, so that air circulation inside the motor is facilitated, and the heat dissipation function of the motor is enhanced.

Referring to fig. 2, the first permanent magnets are built-in, each pole is 4, the permanent magnets are separated by aluminum alloy plates, and eddy current loss of the motor can be effectively reduced by the first permanent magnets after the permanent magnets are partitioned.

Referring to fig. 2, the second permanent magnet is the surface mounting formula, and every utmost point quantity is 1, because the permanent magnet bottom is the arc, can closely laminate with the rotor magnetic pole, can guarantee that motor safe and reliable moves, and the first plane of permanent magnet and second plane all form the fillet that the radius is 5mm with the top, can reduce permanent magnet edge eddy current loss by a wide margin.

Referring to fig. 2, by adopting a built-in-surface-mount hybrid excitation method, the content of the fundamental wave of the air gap flux density can be increased, and the harmonic distortion rate can be reduced, so that the air gap flux density waveform has good sine property and simultaneously has an inhibiting effect on torque pulsation.

This embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to its part without departing from the spirit of the patent.

Claims

1. The utility model provides a novel mixed excitation asynchronous starting PMSM decides rotor structure which characterized in that: the motor adopts a 30-pole 108-slot structure with a stator outside and a rotor inside, and a motor body comprises a rotor bracket (1), a magnet adjusting block (2), a rotor magnetic pole (3), a magnetism isolating sleeve (4), a stator core (5), a damping strip (7), a first permanent magnet (9), a second permanent magnet (10), a filler slot (11) and a rotor ventilation slot (12); the magnetic adjustment block (2) is positioned at the tooth top of the stator and is combined with the tooth part of the motor stator to form a stator core (5), a magnetism isolating sleeve (4) is arranged between the rotor magnetic pole (3) and the rotating shaft, the top of the rotor magnetic pole (3) is provided with four round holes with the radius of 5mm for placing damping strips (7), the bottom of the rotor magnetic pole (3) is provided with four rotor ventilating slots (12) with the same size, and two sides of each rotor magnetic pole are provided with three filler slots (11) with the same size; the first permanent magnets (9) are built-in, each pole is 4, the sections of the permanent magnets are square and have the same area, the permanent magnets are placed between two adjacent rotor magnetic poles (3), and the permanent magnets are respectively separated by filler grooves (11); the second permanent magnet is of a surface-mounted type, the number of each pole is 1, the permanent magnet is arc-shaped at the bottom and can be tightly attached to a rotor magnetic pole, and the first plane (6) and the second plane (8) of the permanent magnet form a fillet with the radius of 5mm with the top.

2. The stator and rotor structure of a novel mixed excitation asynchronous starting permanent magnet synchronous motor as claimed in claim 1, wherein an air gap is left between two adjacent rotor pole sheets.

3. A novel stator and rotor structure of a hybrid excitation asynchronous starting permanent magnet synchronous motor according to claim 1 is characterized in that filler grooves (11) between two adjacent rotor magnetic poles (3) are symmetrically distributed, and aluminum alloy fillers are placed in the filler grooves.