Motor control device that decreases power consumed by control power source when power fails

摘要

A PWM signal generation unit generates a PWM signal to drive a motor, based on a current value of the motor sampled by a current value sampling unit, a position or speed of the motor sampled by a motor sampling unit, and a position or speed of a driven object sampled by a driven object sampling unit. An operation stop unit stops the operation of any one of the motor sampling unit and the driven object sampling unit depending on the power stored in the DC link part and power to which the control power source can supply when the alternating-current power source fails.

主权项

1. A motor control device to which power is supplied from a control power source configured to supply power to a peripheral of a motor in order to control the motor driven by power stored in a DC link part connected to an alternating-current power source via a converter, the motor control device comprising:
a current value sampling unit configured to sample a current value of the motor; a motor sampling unit configured to sample a position or speed of the motor; a driven object sampling unit configured to sample a position or speed of a driven object connected to the motor; a PWM signal generation unit configured to generate a PWM signal to drive the motor, based on the sampled current value of the motor, the position or speed of the motor, and the position or speed of the driven object connected to the motor; and an operation stop unit configured to stop the operation of any one of the motor sampling unit and the driven object sampling unit depending on the power stored in the DC link part and power to which the control power source can supply when the alternating-current power source fails, wherein the operation stop unit stops the operation of any one of the motor sampling unit and the driven object sampling unit if the power stored in the DC link part is larger than any one of first power necessary to retract an driven object connected to the motor to a region where the driven object does not interfere with an object, second power necessary to stop the motor in order to avoid interference of the driven object connected to the motor with the object, and the sum of the first power and the second power, and the power to which the control power source can supply is smaller than the sum of power necessary to drive the peripheral and power necessary to drive the motor control device when the alternating-current power source fails.