Patent ID: 6316893
Filing Date: 2001-11-13
Classification: G05B,H02P

Abstract:
A method of adaptively compensating for a transient phase causing a load change, particularly in connection with an electric motor drive which comprises a motor, the shaft of the motor being connected to a load having a known moment of inertia; a device, such as an inverter, to control the motor, a torque controller being arranged in connection with the device; and a speed controller arranged to control the speed of the motor, the method comprising the steps of:receiving an indication of the start of the transient phase which causes the load to change;determining, during the load change only, an estimate (M.sub.h) for an external torque disturbance which causes the load change, and employing the estimate (M.sub.hl) determined during the previous load change for compensating for the external torque disturbance in controlling the torque of the motor.