| 摘要 |
<P>PROBLEM TO BE SOLVED: To enhance a voltage stabilization effect of a power source line of a system which generates a system voltage on the power source line by boosting a voltage of a DC power source using a step-up converter, and drives an AC motor by the system voltage via an inverter. <P>SOLUTION: The input power (reactive power) of an AC motor 14 is operated to control for stabilizing a system voltage. Here, when the rotational speed of the AC motor 14 is higher than a specified value or when a torque command value is larger than a specified value, a current vector is operated on a delay side to surely obtain a required input power operation amount. Meanwhile, when the rotational speed of the AC motor 14 is a specified value or lower while the torque command value is a specified value or smaller, the current vector is operated on an advancement side to reduce torque fluctuation. When the torque command value of the AC motor 14 is substantially 0, the current vector is strengthed to be set on the magnetic field side, thus preventing the irreversible demagnetization of a permanent magnet. <P>COPYRIGHT: (C)2008,JPO&INPIT |
