Rotor structure and design method of a permanent magnet assisted synchronous reluctance motor

Abstract

The invention belongs to the technical field of permanent magnet motors and relates to a rotor structure of a permanent magnet auxiliary synchronous reluctance motor and a design method. The rotor structure comprises a rotating shaft, a rotor iron core and a permanent magnet block; the rotor iron core is provided with a central hole, and the rotary shaft penetrates through the central hole of therotor iron core and is fixedly connected with the rotor iron core; the rotor iron core is evenly divided into an even number of poles, and at least two layers of U-shaped magnetic barriers are arranged in each pole. The distance between the circle center O1 of an outer circle formed by the U-shaped magnetic barriers in each pole and the circle center O2 of the outer circle of the rotor iron core is h, and h is larger than 0; and a magnetic pole center line formed by the U-shaped magnetic barriers in each pole passes through the circle center O1 and the circle center O2. Therefore, a non-uniform air gap and non-equal-width magnetic bridge rotor structure is constructed. According to the rotor structure and the design method in the invention, the sine degree of air gap flux density in the motor is improved, the air gap flux density waveform is optimized, the problem of torque ripple of the permanent magnet auxiliary synchronous reluctance motor is solved, the torque ripple is obviously reduced, and the motor can be guaranteed to run more stably and efficiently in an electric transmission system.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and relates to a rotor structure and a design method of a permanent magnet assisted synchronous reluctance motor. Background technique [0002] At present, asynchronous motor systems are mostly used in the field of electrical transmission. Compared with asynchronous motor systems, permanent magnet motor systems have the characteristics of low loss and high efficiency, which is the development trend of the next generation of transmission systems. Due to the high back electromotive force of ordinary permanent magnet synchronous motors, there is a danger of damaging the inverter during high-speed operation, so permanent magnet assisted synchronous reluctance motors are favored. [0003] The permanent magnet assisted synchronous reluctance motor has the characteristics of both the permanent magnet synchronous motor and the synchronous reluctance motor. In addition to the significant a...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a rotor structure and design method of a permanent magnet assisted synchronous reluctance motor to solve the problem of large torque ripple during the operation of the existing permanent magnet assisted synchronous reluctance motor, improve the control accuracy of the motor, In order to achieve the smooth and efficient operation of the motor, it can be better applied to the electric drive system

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