| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control system for alternating-current motors wherein the occurrence of a phenomenon in which an actual torque becomes unstable can be suppressed. <P>SOLUTION: A signal processor circuit 44 converts signals from a resolver 25 into pulse signals and counts the pulse signals. The signal processor circuit 44 computes the number of revolutions of an alternating-current motor M1 by sampling the resulting count value at a predetermined sampling cycle. An inverter control circuit 46 changes the voltage phase of a rectangular-wave voltage applied from an inverter 14 to the alternating-current motor M1 according to feedback control on the torque deviation of the alternating-current motor M1. When the number of revolutions SP computed by the signal processor circuit 44 is within a range predetermined as a number-of-revolutions range within which an aliasing error arises in the computation result, an integral gain setting unit 450 reduces an integral gain Kic below the one where the computed number of revolutions SP is out of the predetermined range. <P>COPYRIGHT: (C)2010,JPO&INPIT |
