A permanent magnet brushless DC motor for electric vehicles with offset mounting structure

Abstract

A permanent magnetic direct-current brushless motor of a biased mounting structure comprises an end cap, a rotor assembly, a stator assembly and a motor shaft. The end cap is positioned on two sides of the rotor assembly and composed of a fixed end cap and a drum brake end cap, the rotor assembly is composed of a wheel rim, a magnetic conducting ring in left biased mounting, a fixing ring and a permanent magnet and mounted with the stator assembly in a matched manner, the stator assembly is composed of an iron core and a through groove used for mounting of a winding, silicon steel sheets are arranged on the outer circumference of the iron core and are of a stacked structure, a fixing shaft sleeve is arranged at the center of the iron core in a right biased manner, a fixing support is arranged on the outer circumferential side of the fixing shaft sleeve, the fixing shaft sleeve and the motor shaft are in interference fit, and a knurled structure is arranged at a position where the motor shaft and the fixing shaft sleeve are connected. A motor structure is designed in an optimized manner, and a biased mounting mode is adopted, so that diameter size of the stator assembly and the rotor assembly is increased, key performance parameters like torque and efficiency of the motor are enhanced, and load-carrying capacity of a whole vehicle is improved.

Description

technical field [0001] The present invention relates to the technical field of electric vehicle motors. Specifically, the present invention relates to a permanent magnet brushless DC motor for electric vehicles with an offset mounting structure. Background technique [0002] The motor is one of the core components of an electric vehicle. The performance of the electric vehicle motor directly affects the safety, operability, reliability and service life of the electric vehicle. Considering the overall convenience of electric vehicles, the tires of electric vehicles are usually relatively small, and the outer diameter of the motor rim is affected by the installation size of the tires, resulting in restrictions on the size of the built-in magnetic ring and the size of the stator assembly. The permanent magnet brushless motor is usually installed in a symmetrical structure, and its rotor assembly and stator assembly are usually placed in the middle of the motor, which affects th...

AI Technical Summary

Problems solved by technology

Considering the overall convenience of electric vehicles, the tires of electric vehicles are usually relatively small, and the outer diameter of the motor rim is affected by the installation size of the tires, resulting in restrictions on the size of the built-in magnetic ring and the size of the stator assembly. The permanent magnet brushless motor is usually installed in a symmetrical structure, and its rotor assembly and stator assembly are usually placed in the middle of the motor, which affects the radius of the motor's gyration. The motor is the driving core of the electric vehicle. During operation, it is very easy to have a large load or overload, which will reduce the service life of the motor and cause a high failure rate

At the same time, when the existing ordinary permanent magnet brushless motor for electric vehicles is running in a rainy day or in a dusty environment, the internal air pressure of the motor will increase due to the temperature rise during continuous operation. The air pressure difference will cause external water vapor or dust to enter the motor through the tiny gap of the motor, which will reduce the insulation performance of the motor and affect the service life of the motor

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