Patent ID: 9088227
Filing Date: 2015-07-21
Classification: G03G,G05B,H02P

Abstract:
1. A motor controller, operatively connected to a motor having an output shaft, comprising: a rotary detector to detect a rotation direction and a rotation amount of the output shaft of the motor to generate an actual rotary signal; a drive controller to receive a target rotary signal indicating a target rotary direction and a target rotary amount, and generate a control signal based on the actual rotary signal and the target rotary signal; and a driver to supply driving power to the motor based on the control signal from the drive controller, wherein, when the motor is in a hold state, the drive controller periodically generates a reverse control signal whose polarity is reversed for a predetermined reverse time period T2 per a predetermined one reverse cycle T1, wherein, when the reverse control signal is not output from the drive controller for a certain lock detection time period Tr that is longer than the reverse cycle T1 of the control signal, the driver blocks supply of the driving power to the motor, to put the motor in a locked state.