Brake control device and motor drive device

A brake control device configured to control a brake device that is a non-excitation actuated type and is 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 be controlled so as to output a voltage or not to output the voltage in response to a received power source control signal;
• 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 the brake control signal which has been received;
• 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;
• and
• a power source control unit configured to output, as the power source control signal for the power source, an output OFF signal for controlling the power source so as not to output the voltage, when the occurrence of an abnormality is detected by the abnormality detecting unit.