CN107124051B - A kind of permanent-magnetic synchronous motor rotor structure - Google Patents

Abstract

The invention discloses a permanent magnet synchronous motor rotor structure, which belongs to the technical field of motor body design. The rotor structure includes two claw-pole cores, namely the upper core and the lower core, NdFeB magnets, axially magnetized cylindrical ferrite magnets and auxiliary ferrite magnets; the upper core and the lower iron core There is a positional deviation between the cores, and they are assembled by interlacing each other. NdFeB magnets and auxiliary ferrite magnets are embedded in the middle. The axially magnetized cylindrical ferrite magnets are placed between the upper iron core and the lower iron core. Auxiliary ferrite magnets are distributed around the magnetized cylindrical ferrite magnets, and NdFeB magnets are embedded between adjacent auxiliary ferrite magnets. The body magnet alternates up and down around. The invention can reduce the consumption amount of the permanent magnet, reduce the cost and improve the performance of the motor.

Description

A permanent magnet synchronous motor rotor structure

technical field

The invention relates to a permanent magnet synchronous motor rotor structure, which belongs to the technical field of motor body design.

Background technique

The motor is an indispensable power component in an industrialized society. The permanent magnet synchronous motor has mature technology and high reliability. It is an environmentally friendly and low-carbon motor with high efficiency and high energy density. There is no winding on the rotor, the structure is simple, the operation is reliable, and it is suitable for high-speed operation and harsh working environment. Hence various applications such as aerospace, automotive industry and wind power generation etc. In recent years, due to the wide range of rotor speed adjustment, high torque density and simple structure, the advantages of permanent magnet synchronous motors have become increasingly prominent. Traditional permanent magnet motors have relatively high motor efficiency and power density due to the role of permanent magnets, but permanent magnets require a lot of permanent magnet materials, rare earth permanent magnet resources are scarce, and their cost limits their further development.

Contents of the invention

The invention proposes a rotor structure of a permanent magnet synchronous motor, which can reduce the amount of permanent magnets used, reduce the cost and improve the performance of the motor.

The present invention adopts following technical scheme for solving its technical problem:

A rotor structure of a permanent magnet synchronous motor, characterized in that it includes two claw-pole iron cores, an upper iron core and a lower iron core, an NdFeB magnet, an axially magnetized cylindrical ferrite magnet, and an auxiliary iron core. Ferrite magnets; the position deviation is formed between the upper iron core and the lower iron core, and they are staggered and assembled with each other. NdFeB magnets and auxiliary ferrite magnets are embedded in the middle, and the axially magnetized cylindrical ferrite magnets are placed on the upper Between the iron core and the lower iron core, auxiliary ferrite magnets are distributed around the axially magnetized cylindrical ferrite magnets, and NdFeB magnets are embedded between adjacent auxiliary ferrite magnets. The magnets alternate up and down around an axially magnetized cylindrical ferrite magnet.

The NdFeB magnet and the auxiliary ferrite magnet form two magnetic flux paths, and the two paths are parallel to each other to form a common magnetic circuit.

The ratio of the opening angle a of the rotor pole of the NdFeB magnet to the opening angle a' of the salient pole of the rotor is set to 1.18.

The auxiliary ferrite magnet is embedded between the salient poles of the upper iron core and the lower iron core to form an auxiliary magnetic circuit.

The axially magnetized cylindrical ferrite magnet is located between the upper iron core and the lower iron core, is integrated with the auxiliary ferrite magnet, and is axially magnetized.

The beneficial effects of the present invention are as follows:

1. It has a rotor salient pole tooth groove structure, no winding on the rotor, simple structure and reliable operation.

2. Due to the upper and lower claw pole iron core structure, the permanent magnet material used can be greatly reduced, which can minimize material waste and manufacturing costs.

3. NdFeB magnets and auxiliary ferrite magnets form two magnetic flux circuits to reduce magnetic flux leakage and increase motor output.

4. The ratio of the opening angle a of the rotor magnetic pole to the opening angle a' of the rotor salient pole is set to 1.18, a position deviation is formed between the upper and lower sides of the iron core, and the torque ripple is reduced.

Description of drawings

Fig. 1 is the novel permanent magnet synchronous motor rotor structure expansion diagram of the present invention, wherein: 1, upper iron core; 2, lower iron core; 3, neodymium iron boron magnet; 4, the cylindrical ferrite magnet of axial magnetization; 5. Auxiliary ferrite magnet.

Fig. 2 is a schematic diagram of the magnetic circuit of the new permanent magnet synchronous motor rotor of the present invention.

Fig. 3(a) is an open-angle cross-sectional view of the permanent magnet synchronous motor rotor of the present invention, and Fig. 3(b) is an axial schematic diagram of the permanent magnet synchronous motor of the present invention.

Detailed ways

The invention will be described in further detail below in conjunction with the accompanying drawings.

An example of the embodiment shown is an 8 pole permanent magnet synchronous motor rotor.

As shown in Fig. 1, the rotor structure of the permanent magnet synchronous motor of the present invention includes: two claw pole iron cores, which are respectively an upper iron core 1 and a lower iron core 2, an NdFeB magnet 3, and an axially magnetized cylindrical ferrite Body magnet 4 and auxiliary ferrite magnet 5. The upper iron core 1 and the lower iron core 2 are of the claw pole type, with four teeth and four slots respectively, and are placed in wrong places. An axially magnetized cylindrical ferrite magnet 4 is placed between the upper iron core 1 and the lower iron core 2, and eight NdFeB magnets 3 and auxiliary ferrite magnets 5 are placed around it, and the NdFeB magnets 3 are staggered up and down, and the auxiliary ferrite magnet 5 is spatially located between the salient poles of the upper iron core 1 and the lower iron core 2 . There are 4 N poles and 4 S poles, which alternate with each other.

Figure 2 is a schematic diagram of the magnetic circuit of the permanent magnet synchronous motor rotor. It can be seen that there are two magnetic flux circuits when the permanent magnet synchronous motor rotor is running. The NdFeB magnet 3 and the auxiliary ferrite magnet 5 are respectively connected to the rotor convex The poles form two magnetic flux paths parallel to each other to form a common magnetic circuit. While the amount of permanent magnet materials is reduced, the materials are used to a greater extent, and the leakage flux is reduced to increase the output of the motor.

What Fig. 3 shows is the rotor opening angle sectional view and axial schematic diagram of the invented permanent magnet synchronous motor, it can be seen that the ratio of the opening angle a of the rotor magnetic pole of the NdFeB magnet to the opening angle a' of the salient pole of the rotor is set as 1.18, a position deviation can be formed between the upper and lower sides of the iron core, which structurally reduces the torque ripple of the permanent magnet synchronous motor.

Claims (5)

1. A permanent magnet synchronous motor rotor structure, including two claw pole iron cores, which are respectively the upper iron core (1) and the lower iron core (2), and the upper iron core (1) and the lower iron core (2). The position deviation is formed between them, and they are assembled by interlacing, which is characterized in that: it also includes NdFeB magnets (3), axially magnetized cylindrical ferrite magnets (4) and auxiliary ferrite magnets (5); An NdFeB magnet (3) and an auxiliary ferrite magnet (5) are embedded between the upper iron core (1) and the lower iron core (2), and the axially magnetized cylindrical ferrite magnet (4) is placed on the upper iron core. Between the core (1) and the lower iron core (2), auxiliary ferrite magnets (5) are distributed around the axially magnetized cylindrical ferrite magnet (4), and between the adjacent auxiliary ferrite magnets (5) NdFeB magnets (3) are embedded between them, and the NdFeB magnets (3) alternate up and down around the axially magnetized cylindrical ferrite magnets (4). 2. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that the NdFeB magnet (3) and the auxiliary ferrite magnet (5) form two flux paths, and the two paths are parallel to each other form a common magnetic circuit. 3. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that the ratio of the opening angle a of the rotor pole of the NdFeB magnet (3) to the opening angle a' of the salient pole of the rotor is set to 1.18 . 4. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that the auxiliary ferrite magnet (5) is embedded between the salient poles of the upper iron core (1) and the lower iron core (2), Form an auxiliary magnetic circuit. 5. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that the axially magnetized cylindrical ferrite magnet (4) is located on the upper core (1) and the lower core ( 2), it is integrated with the auxiliary ferrite magnet (5) and magnetized axially.