Abstract
At present, it is the conventional inner rotor motor instead of the internal combustion engine that is adopted by most electric cars. However, compared to the traditional centralized driving pattern, cars adopting a distributed direct driving pattern have higher drive efficiency and more stable handling. Given this background, a kind of direct-drive outer rotor motor with 40 poles and 42 slots applied for middle or low speed electric cars was designed. The core of this study included the electromagnetic analysis and structural design of the motor. Firstly, the material and dimension parameters of the stator and rotor were selected and calculated by the traditional method. The air-gap length and pole-arc coefficient were optimized using an RMxprt module, which was developed using the equivalent magnetic circuit method. Then, a two-dimensional finite-element model was established using ANSYS Maxwell. The magnetic field and torque characteristics of the model were then analyzed. Results show that the design of the motor is reasonable. In addition, a method for reducing the torque ripple was proposed and verified by simulation.
Highlights
In the development of the modern industrial rise today, the automotive industry has become a “bright pearl” of the tech world
Electric vehicles have a become a mainstay in the new energy vehicles because of their minimal pollution of the environment, low energy consumption, flexible control, and some other advantages
There are two driving methods for electric vehicles, which are divided into centralized single motor drive and distributed multi-motor drive [4]
Summary
In the development of the modern industrial rise today, the automotive industry has become a “bright pearl” of the tech world. The permanent-magnet motor is generally an outer rotor type This type of drive can flexibly arrange the drive but can realize the individual control of multiple wheels of the car, as well as vehicle dynamics control technology, such as electronic stability program (ESP), anti-lock brake system (ABS), and electronic brakeforce distribution (EBD) [8]. An outer-rotor brushless DC motor, which can directly drive the electric vehicle, was designed. It deviates from the structure of the traditional electric vehicle drive system. This method was validated and proved effective by finite-element simulation and harmonic analysis
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