A permanent magnet brushless DC hub motor for electric vehicles

Abstract

A permanent-magnet brushless direct-current hub motor having high efficiency and low material loss for an electric vehicle comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a fixed support and a stacked stator steel sheet, the stacked stator steel sheet is formed by laminating a plurality of silicon steel sheets and comprises tooth parts and a tooth groove part, the tooth part comprise tooth ribs and a tooth yoke, the tooth groove part is composed of a semi-closing inner cavity formed between every two tooth parts, a single silicon steel sheet is provided with an automatic-buckling groove, the tooth groove part is of a semi-closing pear-shaped groove structure, a first Hall groove, a second Hall groove and a third Hall groove are arranged on the stacked stator steel sheet, and the stator assembly comprises a rim arranged at the periphery, a magnetic conduction ring and a plurality of magnetic steel sheets. By the permanent-magnet brushless direct-current hub motor, the pole groove ratio is optimized, the performance is improved, the usage of magnetic steel and an enameled wire is reduced, cost is saved, the installation positions of the Hall grooves and the winding mode are optimized, the production efficiency is improved, and the installation accuracy is enhanced.

Description

technical field [0001] The present invention relates to the technical field of electric vehicle motors, in particular, the present invention particularly relates to a permanent magnet brushless DC hub motor for electric vehicles. Background technique [0002] As one of the core components of electric vehicles, the performance of electric vehicle motors directly affects the safety, operability, reliability and service life of electric vehicles. The motor is based on the electromagnetic principle, with the stator and rotor as the core components, converting electrical energy into kinetic energy or mechanical energy, which is mainly output in the form of motor speed and torque. [0003] The permanent magnet brushless DC motor uses permanent magnet material as the fixed magnetic pole of the motor. The relative position of the magnetic pole and the tooth slot is detected by the Hall element, and the position signal is transmitted to the control device. The control device determin...

AI Technical Summary

Problems solved by technology

However, the existing motor is limited by the internal space structure, and the relationship between the stator and the rotor is unreasonable, which affects the energy conversion efficiency and overall output performance of the motor.

Because the rare earth magnetic pole material has the characteristics of large magnetic energy product, strong demagnetization resistance, and high temperature resistance, it can greatly reduce the volume of the motor and simplify the internal structure of the motor, so it is used by most brushless DC motors. However, due to the variability of the motor magnetic field And some performance requirements of motors with prominent requirements are different, and all the magnetic energy is often not fully utilized, resulting in a low utilization rate of magnetic pole materials, rare earth magnetic pole materials are scarce and expensive, resulting in high overall manufacturing costs; on the other hand, the existing motor stator The cogging structure design is poor. On the basis of ensuring the output characteristics of the motor, there are defects such as high copper wire consumption, high copper loss and stator iron loss, and low magnetic energy utilization rate of the magnetic poles.

In all aspects, the existing internal structure of the motor has defects such as low motor conversion efficiency, insufficient output torque, and large amount of materials.

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