ZERO-TORQUE EDDY CURRENT MOTOR SYSTEM AND METHOD FOR CONTROLLING SAME

摘要

ZERO-TORQUE EDDY CURRENT MOTOR SYSTEM AND METHOD FOR CONTROLLING SAME A variable speed eddy current electric motor and method for controlling such an eddy current electric motor is disclosed. The variable speed eddy current electric motor includes a zero torque regulating circuit for sensing and responding to the current flowing through an eddy current motor field coil. As the magnitude of the field coil, current is changed by the eddy current motor's speed control circuit, the zero-torque regulating circuit supplies varying amounts of current to flow through the field coil in a direction opposite to that of the current applied thereto by the speed control circuit. Thus, when the eddy current motor's speed control circuit no longer causes any current to flow through the field coil, the current supplied to the field coil by the zero-torque regulating circuit produces a magnetic filed that removes all torque from the eddy current motor's output shaft.