Novel gradient asymmetric air gap electrical excitation motor

Abstract

The invention provides a novel gradient asymmetric air gap electrical excitation motor. The motor comprises a stator and a rotor. The rotor comprises an electrical excitation iron core and excitation windings. The stator comprises a stator iron core and stator windings. The excitation windings are wound on the pole shoes of the electrical excitation iron core. The stator windings are wound in the slots of the stator iron core. The air gap width between the internal surface of the stator iron core and the external surface of the electrical excitation iron core is gradient and asymmetric, and an asymmetric periodic excitation magnetic field along the external surface of the electrical excitation iron core is provided for the driving motor used for the electric vehicle so that the motor has the advantages of being high in forward efficiency, wide in range of speed regulation and energy-saving and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of driving motors for electric vehicles, and in particular relates to a novel gradually changing asymmetrical air gap permanent magnet motor. Background technique [0002] Issues such as air pollution, global warming, and dwindling oil resources are becoming more and more severe with the increase in the number of vehicles. Based on this, electric vehicles represented by hybrid, pure electric, and fuel cell vehicles (HEV, PEV, FCEV) are the future of vehicle development. Trends, it can not only effectively reduce pollutant emissions, even achieve zero emissions, but also has the advantages of good starting performance, convenient speed regulation, stable operation, and low noise, making electric vehicles. [0003] A pure electric vehicle is a vehicle powered entirely by a secondary battery (such as a lead-acid battery, a nickel-hydrogen battery or a lithium battery). Make supplements. In the development pro...

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Problems solved by technology

[0004] As the core component of an electric vehicle, the drive motor converts electrical energy into kinetic energy during vehicle driving, and its driving performance determines the performance of the electric vehicle; in theory, the drive motor for electric vehicles needs to provide high The output power and output torque meet the requirements of high torque output and high power output during acceleration during start-up, deceleration and climbing of the vehicle, and a wide range of speed regulation and a large weak point are required in the constant power operating range. The multiplier of magnetic speed expansion, but the output torque and output power of the driving motor of the existing electric vehicle are relatively low, and the speed regulation range is narrow in the constant power operating range

[0005] In addition, during the driving process of electric vehicles, due to the driver's vision and habits, generally there are few reverse gear driving conditions, so the vehicle drive motor has high requirements for forward driving performance, but relatively low performance requirements for reverse gear driving. Low; but the air-gap magnetic field of the current conventional electric vehicle drive motor is symmetrically distributed, and the speed-torque map of the motor is symmetrical about the speed axis and the torque axis, resulting in the same difference in the motor driving performance of the vehicle in forward driving and reverse gear driving. Large, and the stator winding current of the driving motor is large when the torque is output, and its armature reaction makes the synthetic magnetic field saturated, which greatly reduces its torque output capability

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