| 摘要 |
PROBLEM TO BE SOLVED: To control an AC motor at high performance in a wide range, from low speed region to high speed region. SOLUTION: Adders 61 to 63 are provided at a pre-stage of a power converter 40 for switching an Ac current control system with a DC current control system. A U-phase voltage command from a current controller 31 and a U-phase voltage command from a two-phase three-phase converter 55 are added by the adder 61, and a U-phase voltage command Vu* as the sum, is fed to a power converter 40. A V-phase voltage command from a current controller 32 and a V-phase voltage command from the two-phase and three-phase converter 55 are added by the adder 62, and a V-phase voltage command Vv* as the sum, is fed to the power converter 40. A W-phase voltage command from a current controller 33 and a W-phase voltage command from the two- phase and three-phase converter 55 are added by the adder 63 and a W-phase voltage command Vw* as the sum is fed the power converter 40. |
