Abstract
In order to increase efficiency and reliability of hub motor power device for distributed driving electric vehicle, a novel hub motor with an external rotor PM (permanent magnet) is designed and optimized. The performance parameters of hub motor are computed and selected based on vehicle dynamics indicators and the driving equations. This paper determines the optimum primary size of hub motor by choosing appropriate magnetic circuit structure and integrating three key parameters, including as stator split ratio, electromagnetic load and viscous damping coefficient. This paper has built the analysis model of external rotor PM hub motor, and simulated and analyzed the transient magnetic field of hub motor under no-load and load transient or steady state. Simulation results indicate that the external rotor PM hub motor designed by combining stator split ratio, electromagnetic load and viscous damping coefficient has satisfactory electromagnetic performance, which can satisfy the performance requirements and indicators of hub motor power device for distributed driving electric vehicles.
Highlights
Under the context of global saving energy and reducing emission, the electric vehicles are becoming more and more important for various countries,[1,2] and modern electric vehicles need use high-performance in-wheel motors.[3]
The electric vehicle acceleration time is regarded as the indicator, which is used to determine the power of the drive motor, and this paper has only taken into account the air resistance power, the rolling resistance power and the acceleration resistance power, the equation is shown in equation (3).[17]
Performance parameter of hub motor is determined based on dynamic performance indicators of distributed driving electric vehicles
Summary
Under the context of global saving energy and reducing emission, the electric vehicles are becoming more and more important for various countries,[1,2] and modern electric vehicles need use high-performance in-wheel motors.[3]. Hanaeinejad and Abbasian[13] has studied an external rotor switched reluctance motor with non-segmented rotor and short magnetic path, which can save rotor cage and only need a shell to maintain the rotor This configuration can reduce the motor components used in in-wheel electric vehicles. A more accurate and reliable electromagnetic design method is proposed, which was used for analyzing the size and performance requirements of hub motor, based on some key parameters, the hub motor analysis model is built. This paper simulates and analyzes the magnetic field distribution and electromagnetic characteristics of hub motor for distributed driving electric vehicles. The maximum speed, slope and acceleration time of the vehicle are used to compute the rated power of hub motor for distributed driving electric vehicles. Maximum speed (km/h) Conventional speed (km/h) 0–100 km/h acceleration time (s) Maximum gradient
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