| 摘要 |
<P>PROBLEM TO BE SOLVED: To switch a rectangular wave control system to a PWM (Pulse Width Modulation) control system at appropriate time and to suppress occurrence of motor overcurrent in a motor control system. <P>SOLUTION: The motor control system includes a controller 100 for selectively setting a control system of an inverter 38 in rectangular wave control, overmodulation PWM control and sine wave PWM control in accordance with an operation condition of an AC motor 14. The controller 100 includes: a control system switching portion switching the rectangular wave control system to the PWM control system by comparing a current phase of motor current with a threshold line on a dq plane; and a threshold change portion S24 changing the threshold line on the dq plane to a spark advance side or a low q-axis current side when a value of an integration term GiΔTr used in proportional integral control of torque deviation ΔTr in a rectangular wave control portion exceeds a prescribed value ΔTr_thr during execution of the rectangular wave control system. <P>COPYRIGHT: (C)2012,JPO&INPIT |
