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 a voltage is applied, the brake control device comprising:

• a power source configured to be controlled so as to output the 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 including a processor with a memory, and 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 the abnormality is detected by the abnormality detecting unit,
• wherein the opening and closing unit includes at least one opening and closing switch configured to open and close an electrical path between a positive electrode terminal of the power source and a positive electrode terminal of the brake device or an electrical path between a negative electrode terminal of the power source and a negative electrode terminal of the brake device,
• wherein the brake control unit is configured to execute
• a brake actuation process to output the brake control signal for controlling the opening and closing switch to open and
• a brake release process to output the brake control signal for controlling the opening and closing switch to close,
• wherein the abnormality detecting unit is configured to detect whether or not the abnormality occurs, during the execution of the brake actuation process, based on the combination of the content of the brake control signal and the content of the state detection signal,
• wherein the power source control unit is configured to output the output OFF signal when the abnormality detecting unit detects the occurrence of the abnormality during the execution of the brake actuation process,
• the abnormality detecting unit is configured to detect whether or not a further abnormality in the power source occurs, while the power source control unit outputs the output OFF signal before the brake actuation process is executed during a transition from the brake actuation process to the brake release process, based on a combination of the content of the brake control signal, the content of the state detection signal, and a content of the power source control signal, and
• wherein the brake control unit is configured to:
• continue the execution of the brake actuation process when the abnormality detecting unit detects the occurrence of the further abnormality in the power source, and
• terminate the brake actuation process and execute the brake release process when the abnormality detecting unit does not detect the occurrence of the further abnormality in the power source.

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 a voltage is applied, the brake control device comprising:

• a power source configured to be controlled so as to output the 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 including a processor with a memory, and 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 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 the abnormality is detected by the abnormality detecting unit;
• a brake lock switch connected between input terminals of the brake device so as to be connected in parallel to 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 the abnormality is detected by the abnormality detecting unit, and
• output an open signal for controlling the brake lock switch to open when the occurrence of the abnormality is not detected by the abnormality detecting unit.