Motor control device

A motor control device comprising:

• a drive unit including three or more half bridges for driving a brushless motor with two or more phases;
• a separation switch that opens to cut off current flowing in at least a regenerative direction between the drive unit and a power source;
• and
• a control unit configured to execute the following steps when an event that requires the brushless motor to be turned off is detected:
• a first step of setting a drive output of at least some of the three or more half bridges to ground level or turning off said at least some of the three or more half bridges;
• a second step of opening the separation switch;
• and
• a third step of turning off a drive output of the remaining half bridges of the three or more half bridges whose drive outputs are not turned off during a period when power flowing to a coil included in the brushless motor is positive or zero.