Patent ID: 8305016

Claim:
A control device for electric motors, for moving one workpiece to be moved by using two electric motors based on periodically repeated commands, the control device comprising: positional deviation calculating parts for calculating positional deviations of the electric motors, respectively; learning control parts for applying a learning control to control the electric motors, the learning control parts calculating amounts of correction of the positional deviations so that the positional deviations calculated by the positional deviation calculating parts are minimized, respectively, such that the positional deviations are converged to predetermined values, respectively; and positional deviation correcting parts for correcting the positional deviations based on the amounts of correction calculated by the learning control parts, respectively, wherein each learning control part is arranged to act independently for each of the electric motors, and a parameter defining response of learning control in one of the learning control parts is equal to a parameter defining response of learning control in the other learning control part.