Four-phase doubly salient motor

Abstract

The invention provides a four-phase doubly salient motor, which belongs to doubly salient motors. The four-phase doubly salient motor consists of a stator and a rotor which are arranged around the same rotating shaft; 8n salient teeth are uniformly distributed on the stator; exciting windings are embedded or permanent magnet steel is arranged in slots at every four salient teeth on the stator; centralized armature windings are sleeved on the salient teeth of each stator respectively; the armature windings on the salient teeth at the same position in a magnetic field are connected in series with one another to form a one-phase winding; and 6n rotor poles are uniformly distributed on the rotor, wherein n is a positive integer and more than or equal to 1. A motor unit has an 8 / 6 structure. The polar distance of the stator is triple the arc length of a stator pole; and the rotor pole is as wide as the stator pole. When the rotor poles are widened until the polar arc coefficient is 1 / 3, the output power is maximum when the motor is used as a generator. Compared with a three-phase 6n / 4n polar doubly salient motor, the four-phase doubly salient motor has higher power density, lower winding copper loss, wider speed regulation range and smaller torque pulse.

Description

technical field [0001] The invention relates to a four-phase double salient pole motor and belongs to the technical field of double salient pole motors. technical background [0002] Double salient motor is a new type of brushless DC motor. According to the excitation method, there are mainly permanent magnet, electric excitation, and hybrid excitation double salient motors. As a low-cost, high-reliability motor with good electrical characteristics, doubly salient motor is attracting extensive attention. [0003] The permanent magnet doubly salient motor is a new type of brushless motor proposed by American scholars in the 1990s. The motor belongs to a variable reluctance motor, on the basis of the structure of the switched reluctance motor, a high-performance permanent magnet is added, so it has the advantages of high power density and high efficiency. Its stator and rotor are both salient pole structures, which are made of silicon steel sheets. There is no winding on the...

AI Technical Summary

Problems solved by technology

The pole arc coefficient of the traditional three-phase double-salient pole motor stator is 1 / 2, and the stator slot area is small, resulting in large copper loss in the winding. This shortcoming is especially obvious in high-power occasions such as wind power generation.

The improvement strategy is to design the motor as a motor with a pole arc coefficient of 1 / 4 to increase the stator slot area, but the output power is significantly reduced

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