Novel magnetic flux adjustable permanent magnet synchronous motor

Abstract

The invention discloses a novel magnetic flux adjustable permanent magnet synchronous motor. Traditional magnetic flux weakening speed regulation has a lot of defects such as reduction of motor efficiency, risks of out of control of magnetic flux weakening and limited magnetic weakening capability. According to the novel magnetic flux adjustable permanent magnet synchronous motor, a permanent magnet is arranged under each pole of a rotor iron core, the permanent magnets are distributed in a U shape, wherein the permanent magnets with high coercivity are distributed at the bottom end of the U shape, the permanent magnets with low coercivity are distributed on the two sides of the U shape, a trapezoidal opening groove is formed above the permanent magnets with the high coercivity, and arc-shaped opening grooves are formed in the two sides of the trapezoidal opening groove. According to the novel magnetic flux controllable permanent magnet synchronous motor, due to the fact that a direct-axis current is applied to a stator winding, the magnetized state of the permanent magnets with the low coercivity can be changed, while the magnetized state of the permanent magnets with the high coercivity is not affected, thereof, the magnetic path inside the rotor is changed, the purpose of adjusting air gap magnetic flux is achieved, and the speed regulation range of the motor can be improved greatly.

Description

technical field [0001] The invention belongs to the field of motor design and relates to a novel magnetic flux adjustable permanent magnet synchronous motor. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has significant advantages such as high efficiency and high power density. In recent years, with the continuous improvement of the performance of permanent magnet materials and the cost performance of power electronic devices, permanent magnet synchronous motors have been more and more widely used in industry, agriculture, national defense and daily life. The stator structure of the permanent magnet synchronous motor is the same as that of the DC motor and the asynchronous motor, but the rotor structure is quite different. According to the difference in the position of the permanent magnet on the rotor, the rotor magnetic circuit structure can generally be divided into three types: surface type, built-in type and claw pole type. Currently more com...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing permanent magnet synchronous electric gap magnetic flux cannot be adjusted, so as to reduce the problems such as the decrease of motor efficiency caused by field weakening speed regulation, the risk of field weakening out of control, and the limited field weakening capability. A Novel Flux Adjustable Permanent Magnet Synchronous Motor Structure

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