MOTOR CONTROLLER HAVING ABNORMALITY DETECTION FUNCTION OF POWER TRANSMISSION UNIT BETWEEN MOTOR AND MAIN SHAFT

摘要

A motor controller includes: a motor rotation angle acquisition unit acquiring the rotation angle of the motor; a main shaft rotation angle acquisition unit acquiring the rotation angle of the main shaft; a one-rotation signal acquisition unit acquiring a one-rotation signal output every time the main shaft rotates once; a motor rotation speed calculation unit calculating the rotation speed of the motor from the rotation angle of the motor; a main shaft speed calculation unit calculating the rotation speed of the main shaft from the rotation angle of the main shaft; and an abnormality determination unit in which, when a change amount of the rotation angle of the motor or when the difference between the rotation speed of the motor and the rotation speed of the main shaft deviates from a second range, it is determined that an abnormality has occurred in the power transmission unit.

主权项

1. A motor controller which controls the rotation drive of a motor in which a rotational power is transmitted to a main shaft via a power transmission unit, comprising:
a motor rotation angle acquisition unit acquiring the rotation angle of the motor; a main shaft rotation angle acquisition unit acquiring the rotation angle of the main shaft; a one-rotation signal acquisition unit acquiring a one-rotation signal output every time the main shaft rotates once; a motor rotation speed calculation unit calculating the rotation speed of the motor from the acquired rotation angle of the motor; a main shaft speed calculation unit calculating the rotation speed of the main shaft from the acquired rotation angle of the main shaft; and an abnormality determination unit in which, when a change amount of the rotation angle of the motor which is acquired between the time when a one-rotation signal is acquired and the time when the next one-rotation signal is acquired deviates from a first range or when the difference between the rotation speed of the motor and the rotation speed of the main shaft deviates from a second range, it is determined that an abnormality has occurred in the power transmission unit.