Hub motor for electric vehicle

Abstract

The invention discloses a hub motor for an electric vehicle, which comprises a stator, a rotor and a connecting shaft, wherein the stator comprises an iron core and a bracket, the iron core is fixed on the bracket and is formed by laminating stator sheets in a spiral winding manner, and the notch width of a tooth socket, the outer diameter of the iron core, the thickness of the tooth lip of the iron core, the inner diameter of the iron core, the thickness of the yoke part of the iron core, the number of the tooth sockets of the iron core and the notch width of the stator sheet meet the following relation: the notch width of the tooth socket = pi x [the outer diameter of the iron core - 2 x the thickness of the tooth lip of the iron core - 2 x alpha x (the inner diameter of the iron core +the thickness of the yoke part of the iron core)] / the number of the tooth sockets of the iron core + the notch width of the stator sheet, wherein the value scope of alpha is 0.45~0.55, and the notch width value scope of the stator piece is 0~2 mm. The hub motor for the electric vehicle has the advantages that: the stator structure optimizes the tooth socket structure of the motor, improves the power density and the working efficiency of the motor, enhances the short-time overload capacity of the motor, reduces the temperature rise and the manufacturing cost of the motor, and prolongs the service life.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a hub motor for electric vehicles. Background technique [0002] With the continuous development of science and technology, electric vehicles are becoming more and more popular as a means of green transportation. They are gradually promoted from flat road areas such as cities to areas with complex road conditions such as rural areas and mountainous areas, especially for agricultural use in rural areas. In terms of cargo transportation, electric vehicles limit the performance expansion space of electric wheel hub motors due to their lightness and environmental protection characteristics. Electric wheel hub motors are used as the driving components of electric vehicles in the field of electric vehicle technology. Within the industry, optimizing motor performance has become the goal of continuous research and development in the industry. [0003] In the current electric v...

AI Technical Summary

Problems solved by technology

[0003] In the current electric vehicle motor market, hub motors are mostly used as driving components, and hub motors are generally disc-shaped and have a relatively flat structure, which leads to a large waste of motor stators during blanking. The reusability rate of the blanking of the inner ring is low, so the manufacturing cost is high, and the stator formed by spiral winding, because its notch is naturally rolled out from the long strip punching sheet of the stator, its size is the same as the slot shape of the stator It is related to the inner and outer diameters of the stator, and the notch affects the cogging torque of the motor, which is related to the working efficiency and output stability of the motor. Therefore, those skilled in the art are committed to developing a hub motor for electric vehicles, reducing the gear The effect of the groove torque to improve the performance of the motor

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