| 摘要 |
PURPOSE:To suppress a copper loss and to improve an operating efficiency by reducing a reactive current component of a current of a motor as much as possible. CONSTITUTION:Currents of stator windings 11a of phases are detected by a current detector 14. A rotating position of a rotor of a motor 11 is detected by a rotary encoder 15. A memory 16 outputs a current command value responsive to the rotating position of the rotor. The command value is so previously stored as to become a waveform following to that of an induced voltage of the winding 11a. When the command value is output from the memory 16, comparators 18 to 20 apply compared results with the current to a control circuit 21, which applies a control signal to a driving circuit 12 so as to supply a current following to the induced voltage. Thus, a deviation of phases of harmonic wave components is eliminated to reduce a reactive current. |
