A dual motor handwheel actuator assembly for a vehicle, for example a steer-by-wire system, has two permanent magnet motors 10, 11, each having the same number of poles and stators so each motor produces the same pattern of cogging torque over a complete mechanical revolution of the motor. In an unpowered condition where both motors 10, 11 are undriven, at least one part of one phase of each motor is short circuited so both motors provide a braking torque as the driver turns the wheel. The phases to include the short are selected according to the mechanical offset of the two motors relative to an output shaft, so that the effect of torque ripple applied to the output shaft in the braking torque by first motor 10 is at least partially cancelled by the effect of torque ripple applied to the shaft in the braking torque by the second motor 11.
A dual motor handwheel actuator assembly
2025-01-15
Patent
Electronic Resource
English
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge |