Permanent magnet synchronous machine (PMSM) possessing assembled magnetic effect

Abstract

The invention provides a permanent magnet synchronous machine (PMSM) possessing an assembled magnetic effect. The PMSM comprises a stator and a rotor. Air gaps exist between the stator and the rotor. The stator includes a stator core and a stator winding. The rotor includes a rotor core, a rotating shaft and permanent magnet steel. The stator winding is a centralized winding. The rotor is an eccentric rotor. Ends of the permanent magnet steel are directly connected with each other. The air gaps between the stator and the rotor are non-uniform air gaps. The invention has the following positive effects that: (1) distribution of air-gap flux density can be optimized through improving a rotor structure and the air gap flux can be very close to a sinusoidal waveform by using the non-uniform air gaps; (2) magnetic flux leakage on the ends can be effectively reduced because the ends of the permanent magnet steel are directly connected with each other, and simultaneously a magnetic isolation bushing is not needed to be installed on a rotating shaft side so that a requirement of a rotating shaft material can be reduced, wherein the rotating shaft can adopt a magnetic conductive material and / or a non magnetic conductive material.

Description

technical field [0001] The invention relates to an AC synchronous motor, in particular to a permanent magnet synchronous motor with magnetism gathering effect. Background technique [0002] Permanent Magnet Synchronous Machine (PMSM) has no excitation winding and excitation device, does not consume excitation power, and can also save slip rings and brushes, so compared with electric excitation motors, it has simple structure, reliable operation, High power density, low loss, flexible shape and size and other significant advantages, the application range is extremely wide. [0003] The traditional permanent magnet synchronous motor can be divided into surface type and built-in type according to the position of the permanent magnet on the rotor. The air gap between the stator and the rotor is uniform, and the stator winding adopts distributed winding to make the air gap magnetic flux of the motor better close to the sinusoidal distribution. [0004] attached figure 1 What i...

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Problems solved by technology

However, the use of distributed windings has the following disadvantages: (1) The ends of distributed windings are long and a lot of copper is wasted; (2) The leakage reactance is large; (3) It is difficult to get off the line and the structure is complicated

[0009] use image 3 and Figure 4 Although the permanent magnet synchronous motors with the rotor structure shown have a certain magnetic concentration effect, the magnetic flux leakage on the shaft side is large, and the non-magnetic bushing is required to isolate the magnetic field on the shaft side, and the material of the shaft is non-magnetic material. It has the following disadvantages: (1) heavy weight; (2) complex structure; (3) high requirements for shaft materials

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