| 摘要 |
A motor control device (4) includes a drive circuit (40) that supplies drive electric power in three phases to a motor (20), according to turning on or off of FETs (42u to 42w, and 43u to 43w); a microcomputer (41) that generates control signals (Sc1 to Sc6) for turning on or off the FETs (42u to 42w, and 43u to 43w). The microcomputer (41) computes phase voltage command values for the motor (20) through feedback control that causes phase current values for the motor to follow current command values, and generates the control signals (Sc1 to Sc6) based on the computed phase voltage command values. The microcomputer (41) detects a current-carrying failure in a U phase when all of (i) a condition that an absolute value of a U phase current value is less than a current determination value, (ii) a condition that a duty value corresponding to the U phase voltage command value is equal to or greater than a first duty determination value, or equal to or less than a second duty determination value; and (iii) a condition that the U phase voltage command value is deviated from the V phase and W phase voltage command values are satisfied. |
