| 摘要 |
<P>PROBLEM TO BE SOLVED: To correct a shift of a detected current value due to a gain error of a current sensor for detecting a current in an AC motor. <P>SOLUTION: A reactive current command is issued to give instructions to cause a reactive current that does not contribute to generation of torque by the AC motor 17 to flow in the AC motor 17 while the AC motor 17 is suspended before control of the AC motor 17 is started, and current command values Iv, Iw for V and W phases are found from a command current vector (Id, Iq) when the reactive current command is issued. From the current command values Iv, Iw for V and W phases (substitute information for a real current) and the outputs (detected current values iv, iw) of the current sensors 38, 39 for V and W phases, gain errors kv, kw of the current sensors 38, 39 for V and W phases are calculated. By correcting the outputs of the current sensors 38, 39 by using these gain errors kv, kw, a shift of the detected current values iv, iw due to the gain errors of the current sensors 38, 39 is corrected. <P>COPYRIGHT: (C)2011,JPO&INPIT |
