| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor controller which can reduce low order harmonic currents while ensuring stability, when a large ripple is generated in the DC voltage.SOLUTION: The motor controller comprises: a rectifier circuit being fed from a single phase AC power supply; an inverter connected with the rectifier circuit and inverting a DC power obtained from the rectifier circuit into a three-phase AC power; a motor connected with the output side of the inverter; a controller for controller the inverter; a zero-cross point detection circuit for detecting the zero-cross point of the single phase AC power supply; and an AC current detection circuit for detecting the current of the single phase AC power supply. The controller comprises: number-of-revolution setting means for setting the number of revolution of a motor; and number-of-revolution correction means for correcting the number of revolution of a motor, being set by the number of revolution setting means, so that the harmonic currents of the single phase AC power supply is reduced, based on the time elapsed after zero-cross point detection of the zero-cross point detection circuit and the detection results from the AC current detection circuit. |
