Motor control device, motor control system and control method

Abstract

[Problem] To provide a motor control device that can reduce the load pressure on the motor during deceleration. [Solution] The motor control device 100 includes: an inverter circuit 20; and a control drive circuit 30, which supplies drive signals to each of the multiple array of switching elements constituting the inverter circuit 20 for controlling the motor 10. The control drive circuit 30 performs control by repeatedly switching between a fully closed mode and a short-circuit braking mode to reduce the rotational speed of the motor 10. In the fully closed mode, all switching elements are closed. In the short-circuit braking mode, one group of all upper switching elements and one group of all lower switching elements are opened, and the other group of all upper switching elements and the aforementioned group of all lower switching elements are closed.