CN209860682U

CN209860682U - Rotor of sine wave magnetic field asynchronous starting permanent magnet synchronous motor

Info

Publication number: CN209860682U
Application number: CN201920915225.8U
Authority: CN
Inventors: 朱庆国
Original assignee: Luneng Environment Protection Science And Technology Development Co Ltd Jili
Current assignee: Luneng Environment Protection Science And Technology Development Co Ltd Jili
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2019-12-27
Anticipated expiration: 2029-06-18

Abstract

A rotor of a sine-wave magnetic field asynchronous starting permanent magnet synchronous motor belongs to the technical field of motor manufacturing and is formed by a rotor body, a permanent magnet and conducting bar grooves, wherein the distance between the conducting bar grooves in the center of a magnetic pole is the largest, and the distances between the conducting bar grooves on two sides of the magnetic pole are sequentially and gradually reduced. The air-gap magnetic field generated by the method is close to a sine wave magnetic field, so that the trend of magnetic lines of force in the rotor is changed, and the distribution of magnetic flux flowing to the air-gap magnetic field of the motor is changed. The utility model discloses the device is not increasing motor manufacturing cost, does not increase under the condition of the motor manufacturing process degree of difficulty, has realized sine wave permanent-magnet machine air gap magnetic field. The sine wave magnetic field enables the starting performance of the motor to be better, the running vibration and noise are reduced, the efficiency of the motor is improved, and the energy-saving effect is achieved.

Description

Rotor of sine wave magnetic field asynchronous starting permanent magnet synchronous motor

Technical Field

The utility model belongs to the technical field of the motor is made, a rotor of asynchronous starting permanent magnet synchronous motor is related to.

Background

The existing asynchronous starting permanent magnet synchronous motor comprises a rotor body, permanent magnets and conducting bar grooves, wherein the permanent magnets are uniformly distributed on the rotor body in a radioactive mode, aluminum conducting bars are arranged at the conducting bar grooves, the aluminum conducting bars are coupled with a stator rotating magnetic field when the motor is started, the starting process is completed, and then the permanent magnet magnetic field is coupled with a stator magnetic field to achieve normal operation of the motor. The structure of the conducting bar grooves on the rotor is the same as that of an asynchronous motor, the conducting bar grooves are uniformly distributed at the edge of the rotor body and are the same in shape and size, the air gap magnetic field generated by the permanent magnet is a square wave magnetic field, when the method is applied to an asynchronous starting permanent magnet synchronous motor, the magnetic field contains a large amount of harmonic waves, the harmonic wave magnetic field generates high harmonic wave iron loss when the motor runs, and simultaneously generates additional torque to cause motor vibration and noise, so that the motor efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a rotor of sine wave magnetic field asynchronous starting permanent magnet synchronous motor realizes the motor steady start, high-efficient operation to reduce vibration and noise.

If the air gap field that can be realized when the motor starts is a sine wave field, the problem that appears in the starting process can be effectively overcome.

The utility model provides a technical problem's scheme is that adopt rotor body, permanent magnet and conducting bar groove to constitute sine wave magnetic field asynchronous starting permanent magnet synchronous motor's rotor, and wherein the conducting bar groove interval that magnetic pole central point put is the biggest, and its both sides conducting bar groove interval progressively reduces in proper order, and two adjacent permanent magnet intermediate positions's conducting bar groove interval is the biggest promptly, then progressively reduces conducting bar groove interval to both sides in proper order. The air-gap magnetic field generated by the method is close to a sine wave magnetic field, so that the trend of magnetic lines of force in the rotor is changed, and the distribution of magnetic flux flowing to the air-gap magnetic field of the motor is changed. The smaller the conducting bar slot gap is, the larger the magnetic resistance is, the less the magnetic flux flows through, and the lower the air gap magnetic density at the corresponding position is. Conversely, the larger the bar-slot gap, the smaller the reluctance, and the more magnetic flux that flows through the gap, the higher the air-gap flux density.

The closer to the sine wave magnetic field, the better the starting effect is, and the spacing between the guide bar grooves can be further determined according to the spacing between the guide bar grooves when the guide bar grooves are uniformly distributed at the edge of the rotor body. There may be 7 bar slots, 6 bar slots or 5 bar slots per pole, depending on the number of permanent magnets. Under the condition of 7 conducting bar grooves per magnetic pole, the ratio of the groove distance t1 to t2 to t3 to t4 is 8:4-4.5:3.5-2.8:2.6-2.3, and an air gap magnetic field close to a sine wave can be achieved; under the condition of 6 conducting bar grooves per magnetic pole, the ratio of the groove spacing t1 to t2 to t3 is 12:6-3.5:3.3-2.7, and an air gap magnetic field close to a sine wave can be achieved; under the condition of 5 conducting bar grooves per magnetic pole, the ratio of the groove spacing t1 to t2 to t3 is 19:7-4:3.5-2.5, and the air gap magnetic field close to a sine wave can be achieved.

If the generated air gap magnetic field is close to the sine wave magnetic field, the rotor structure can be designed through computer drawing software, and the size and the distribution of the conducting bar grooves can be adjusted once or for many times. And checking whether the air-gap magnetic field waveform of the motor is close to the sine waveform by means of computer electromagnetic simulation software until the air-gap magnetic field waveform reaches or is close to the sine waveform. Although theoretically, the closer the magnetic field waveform is to the sine waveform, the more ideal the starting effect is, the degree of the air gap flux density close to the sine wave can be selected according to the working condition requirement. Therefore, the air gap flux density which is approximately sine wave-shaped can be generated under the general condition, and the starting and running requirements of the motor can be met.

The utility model discloses the device is not increasing motor manufacturing cost, does not increase under the condition of the motor manufacturing process degree of difficulty, has realized sine wave permanent-magnet machine air gap magnetic field. The sine wave magnetic field enables the starting performance of the motor to be better, the running vibration and noise are reduced, the efficiency of the motor is improved, and the energy-saving effect is achieved.

Drawings

FIG. 1 is a schematic view of the product of the present invention;

FIG. 2 is a diagram of the trend of electromagnetic simulation magnetic lines;

FIG. 3 is a schematic diagram of electromagnetic simulation air gap magnetic field waveform

FIG. 4 is a schematic diagram of a product with 6 bar slots per pole;

fig. 5 is a schematic diagram of a product with 5 bar slots per pole.

Detailed Description

Example 1, the present invention is composed of a rotor body 1, a permanent magnet 2 and conducting bar slots 3, wherein the conducting bar slot pitch at the center position of a magnetic pole is the largest, the conducting bar slot pitches at two sides of the magnetic pole are sequentially and gradually reduced, and the ratio of the slot pitch t1: t2: t3: t4 is 8:4.3:3:2.5 under the condition of 7 conducting bar slots per magnetic pole. The rotor structure is designed through computer drawing software, and the size and distribution of the guide bar grooves are adjusted once or for many times. See fig. 1.

Example 2, the present invention is composed of a rotor body 1, a permanent magnet 2 and conducting bar slots 3, wherein the conducting bar slot pitch at the center position of a magnetic pole is the largest, the conducting bar slot pitches at two sides of the magnetic pole are sequentially and gradually reduced, and under the condition that each magnetic pole has 6 conducting bar slots, the ratio of the slot pitch t1: t2: t3 is 12:5: 3.

Example 3, the present invention is composed of a rotor body 1, a permanent magnet 2 and conducting bar slots 3, wherein the conducting bar slot pitch at the center position of a magnetic pole is the largest, the conducting bar slot pitches at two sides of the magnetic pole are sequentially and gradually reduced, and under the condition that each magnetic pole has 5 conducting bar slots, the ratio of the slot pitch t1: t2: t3 is 19:5: 3.

Claims

1. The utility model provides a rotor of sine wave magnetic field asynchronous starting permanent magnet synchronous motor, comprises body, permanent magnet and conducting bar groove which characterized in that: the distance between the conducting bar grooves at the center of the magnetic pole is the largest, and the distances between the conducting bar grooves at the two sides of the magnetic pole are gradually reduced.

2. The rotor of an electric motor according to claim 1, characterized in that: under the condition of 7 conducting bar grooves per magnetic pole, the ratio of the groove spacing t1 to t2 to t3 to t4 is 8:4-4.5:3.5-2.8: 2.6-2.3.

3. The rotor of an electric motor according to claim 2, characterized in that: the ratio of the slot spacing t1: t2: t3: t4 is 8:4.3:3: 2.5.

4. The rotor of an electric motor according to claim 1, characterized in that: under the condition of 6 conducting bar grooves per magnetic pole, the ratio of the groove spacing t1 to t2 to t3 is 12:6-3.5: 3.3-2.7.

5. The rotor of an electric motor according to claim 4, wherein: the slot spacing t1: t2: t3 ratio was 12:5: 3.

6. The rotor of an electric motor according to claim 1, characterized in that: under the condition of 5 conducting bar grooves per magnetic pole, the ratio of the groove spacing t1 to t2 to t3 is 19:7-4: 3.5-2.5.

7. The rotor of an electric motor according to claim 6, wherein: the slot spacing t1: t2: t3 ratio was 19:5: 3.