A permanent magnet synchronous drive motor for electric vehicles

Abstract

The invention provides an electric vehicle permanent magnet synchronous driving motor and belongs to the technical field of electric vehicles. The driving motor is an inner rotor structure and includes first permanent magnets, second permanent magnets, a nonmagnetic fixed core, a rotor core and a stator, wherein the rotor core is internally fixed to the nonmagnetic fixed core; the number of the first permanent magnets and the number of the second permanent magnets are the same and are both even numbers; the first permanent magnets and the second permanent magnets have different lengths and arein [lambda] shapes; the outer side of the rotor core has a high-strength steel hoop. Compared with the existing permanent magnet synchronous motor, the electric vehicle permanent magnet synchronous driving motor has higher magnetic field strength, larger output power, larger mechanical strength, and lower torque ripple, can utilize reluctance torque, and has better sinusoidality in the air gap flux density.

Description

technical field [0001] The invention relates to a permanent magnet synchronous drive motor of an electric vehicle, which belongs to the technical field of electric vehicles. Background technique [0002] Energy issues are one of the key issues in the 21st century. As the largest consumer of electric energy, motors greatly affect the implementation of energy conservation and emission reduction. The development and design of energy-saving and efficient motors is of great significance to energy conservation and emission reduction. The permanent magnet synchronous motor has the advantages of simple structure, high efficiency, high power factor, and no need for excitation windings, and has attracted the attention of countries all over the world. [0003] A permanent magnet synchronous motor is a motor in which permanent magnets are excited to generate a synchronous rotating magnetic field. According to the permanent magnet structure classification: surface permanent magnet synch...

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Problems solved by technology

[0005] At present, the permanent magnet arrangement of most permanent magnet synchronous motors adopts built-in "one" shape, "V" shape and "U" shape. Although these permanent magnet arrangement methods can use reluctance torque, they also have cogging torque. Unfavorable factors such as excessively large torque ripple and air gap flux density are easily affected by the armature reaction, which are not conducive to improving the efficiency and stability of the motor

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