Power Supply System Design and Dynamic Analysis of a Permanent Magnet Bistable Electromagnetic Clutch for Wheel Motor Drive

In-wheel motor is recognized as the ideal form for electric vehicle drive. To reduce the mechanical shock and the electromagnetic impulsion brought by the rigid connection between the hub and the motor, a permanent magnet bistable electromagnetic clutch which flexibly connects the motor and the hub is proposed. In this paper, several power supply schemes for the clutch are discussed. Firstly, based on the dynamic simulation model, the static and dynamic performances of the clutch unit are studied, and then the advantages and disadvantages of these power supply systems are compared. Furthermore, the capacitor discharge pulsed power supply defined as “rotor side harmonic power generation + rechargeable battery + clutch wireless remote control” is intensively investigated. Based on the proposed analytical solution of the current pulse width, the optimal design is carried out, the capacitance, charging voltage, coil turns, and coil wire diameter is determined. Finally, experimental results verified the effectiveness of these power supply systems and the rationality of design.