Patent ID: 8538641

Claim:
A multiple motor drive system that provides a differential speed operation for driving a common load structure, comprising: a first individual motor (M 100 ) and a second individual motor (M 200 ) installed on the common load structure; a first continuously variable transmission (CVT 100 ) installed on the common load structure and connected between the first individual motor (M 100 ) and a first wheel group (W 100 ), said first continuously variable transmission (CVT 100 ) being arranged to automatically control a speed ratio according to a load state on the respective first wheel group (W 100 ); a second continuously variable transmission (CVT 200 ) installed on the common load structure and connected between the second individual motor (M 200 ) and a second wheel group (W 200 ), said second continuously variable transmission (CVT 200 ) being arranged to automatically control a speed ratio according to a load state on the respective second wheel group (W 200 ); and an electric control unit (ECU 100 ) arranged to respectively control a rotation speed, torque, direction, and current of the first and second individual motors (M 100 , M 200 ) without using a closed or semi-closed loop to achieve the differential speed operation, the differential speed operation instead being achieved through the respective speed ratio control provided by the first continuously variable transmission (CVT 100 ) and the second continuously variable transmission (CVT 200 ).