| 摘要 |
<P>PROBLEM TO BE SOLVED: To implement AC motor control capable of improving torque following quality when decreasing torque from a high torque range by simple control. <P>SOLUTION: In a rectangular voltage control mode, an inverter 14 converts a DC voltage on a power line 7 to a rectangular voltage to feed an AC motor M1 in response to control signals S3-S8 from a control device 30. The control device 30 controls the phase of the rectangular voltage such that an output torque of the AC motor M1 matches a torque command value Tqcom. The control device 30 changes an upper limit guard value of the voltage phase in a torque decreasing direction from a normal level when decreasing the torque of the AC motor while the torque is in a high torque range. This forcibly ensures a change amount in the voltage phase. <P>COPYRIGHT: (C)2013,JPO&INPIT |
