MOTOR CONTROL CIRCUIT, MOTOR DRIVE CONTROLLER AND CONTROL METHOD OF MOTOR DRIVE CONTROLLER

摘要

PROBLEM TO BE SOLVED: To provide a motor control circuit capable of preventing occurrence of abnormal state when using a free run stop method.SOLUTION: A speed control circuit 33 outputs a torque command signal S1 based on a clock signal Sc and a revolution signal Sr, and a sine wave drive circuit 35 generates a drive command signal Sd based on the torque command signal S1. When input of the clock signal Sc was stopped, a drive stop control circuit 41 outputs a drive stop control signal S5 based on the revolution signal Sr and torque command signal S1. A first drive stop control signal S5a for performing short circuit brake control based on the detection results that the torque command signal S1 is less than a specified value, and the revolution speed of the motor 20 is less than a specified first threshold, is outputted, and a second drive stop control signal S5b for performing free run stop control based on the detection results that the torque command signal S1 is less than a specified value, and the motor 20 is in drive sop state, is outputted.SELECTED DRAWING: Figure 2