Brake control device and motor drive device

A brake control device configured to control a brake device that is non-excitation actuated type and configured to actuate a brake in a non-excitation state in which no voltage is applied and to release the brake in an excitation state in which the voltage is applied, the brake control device comprising:

• a power source configured to output a voltage;
• a brake control unit configured to output a brake control signal;
• an opening and closing unit connected in series to the brake device and configured to open and close an electrical path between the power source and the brake device in response to a received brake control signal;
• a state detecting unit configured to output a state detection signal indicating a potential state of an electrical path between the opening and closing unit and the brake device;
• an abnormality detecting unit configured to detect whether or not an abnormality occurs, based on a combination of a content of the brake control signal and a content of the state detection signal;
• a brake lock switch connected in parallel to the brake device between input terminals of the brake device, and configured to open and close an electrical path in response to a received brake lock control signal;
• and
• a brake lock switch control unit configured to output, as the brake lock control signal for the brake lock switch, a close signal for controlling the brake lock switch to close when the occurrence of an abnormality is detected by the abnormality detecting unit.