Patent ID: 9342057
Filing Date: 2016-05-17
CPC Classification: G05B,H02P

Claim Text:
1. A motor control apparatus comprising: a main circuit including a converter configured to convert AC power supply into DC power supply, a smoothing capacitor connected in parallel with the DC power supply, and an inverter configured to convert the DC power supply into AC power supply to drive a motor; a voltage detector configured to detect DC voltage of the main circuit; and a controller including a position controller configured to generate a speed command on the basis of a positional command and a motor position, and a speed controller configured to generate a torque command on the basis of the speed command and a motor speed, the controller being configured to control the inverter on the basis of the torque command, the controller includes: a torque limiter configured to start first torque limitation which limits a commanded torque based on the torque command to a first torque or less in a case where the voltage detector detects that the DC voltage falls below a predetermined voltage, and to cancel the first torque limitation in a case where the voltage detector detects that the DC voltage exceeds the predetermined voltage; and a speed limiter configured to limit a commanded speed based on the speed command to a first speed or less in a case where the torque limiter cancels the first torque limitation.