| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control unit for an electric motor capable of sufficiently taking measures for torque oscillations and out-of-synchronization and widely ensuring an operable area in using an embedded-magnet type motor as a synchronous motor. <P>SOLUTION: The control unit includes: a target DQ-axes current command value calculation part 11 for specifying a Q-axis current target value and a D-axis current target value; a three-phase current detection part 19 for detecting AC current; a rotation angle detection part 20 for detecting a rotation angle; a current conversion part 18 for calculating the detected value of Q-axis current and the detected value of D-axis current; a Q-axis current FB controller 14 for calculating a Q-axis current command value; a D-axis current FB controller 15 for calculating a D-axis current command value; an inverter control signal calculation part 16 for calculating a control signal of an inverter; and a motor torque estimation part 17 for estimating motor torque. The Q-axis current FB controller 14 and the D-axis current FB controller 15 perform gain processing for reducing P gain and I gain in PI control as shown in Fig. 2 when the motor torque is greater than a predetermined value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
