| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a d-axis current control device which sets operation characteristics more easily than a conventional one by combining d-axis current characteristics with respect to speed and a voltage, and d-axis current characteristics with respect to torque. <P>SOLUTION: Reference characteristics with respect to the speed and the voltage at non-load torque are set, a torque component is decided by combining maximum torque and the set reference characteristics, and the setting and the operation of a d-axis current command value are facilitated. The synchronization of a maximum torque control component and a weaker magnetic field control component obtained by adding them, and the use of maximum values of the components are made to be selectable, and the d-axis current command value is obtained. Furthermore, a d-axis current at high-speed low torque is reduced more than the case that the maximum torque component idt is added to the weaker magnetic field component idw of a d-axis current command by making variable a voltage value at the time when referring to current command characteristics by output torque. <P>COPYRIGHT: (C)2010,JPO&INPIT |
