DRIVE FORCE CONTROL SYSTEM FOR ELECTRIC VEHICLE, ELECTRIC VEHICLE, AND ROTARY ELECTRICAL MACHINE

摘要

[Problem] To maintain yaw rate behavior even when drive force distribution to wheels has been made to vary in order to avoid loss of motor drive capability. [Solution] A drive force control system Sy of an electric vehicle 1 comprises: motors 3FL-3RR which are configured so as to have varying magnetic field fluxes and which individually drive wheels 2FL-2RR; temperature sensors 6FL-6RR that individually detect the temperatures of the motors 3FL-3RR; a state determination unit 505 that determines whether the thermal states of the motors 3 are suitable on the basis of the temperatures detected by the temperature sensors 6; a command correction unit 506 that, if the state determination unit 505 has determined that the thermal state of one or more of the motors 3 is not suitable, corrects a torque command to said motor 3 towards the reduction side and, in order to maintain the electric vehicle 1 yaw moment in a case where such correction is not performed, the command correction unit corrects the torque commands to the remaining motors 3; and a field control unit 507 that individually controls the magnetic field fluxes of the motors 3FL-3RR on the basis of the torque commands corrected by the command correction unit 506.