| 摘要 |
PURPOSE:To need no speed detector, by using the magnetic flux of a motor found respectively by a voltage model system and a current model system, as the reference axis of a vector rotary-device and a coordinate converting circuit. CONSTITUTION:The two-phase amounts ialpha, ibeta of three-phase/two-phase-converted primary current are converted to rotary coodinate amounts iM, iT by a vector rotary-device 11. Then, according to a deviation between magnetized current command iM* and torque current command ir* from a magnetic flux command arithmetic unit 4 and a speed regulator 5, and the rotary coordinate amounts iM and ir, the M-axial component VM* and the T-axial component Vr* of the primary voltage command of a motor are applied to a coordinate converter 8. In this case, as the reference axis of the vector rotary-device 11 and the coordinate converter 8, the magnetic flux phiv, phi1 of the motor on which arithmetic is performed respectively by a voltage model arithmetic unit 18 and a current model arithmetic unit 10 is used. Then, the deviation between the torque current command ir* and the rotary coordinate amount ir is integrated and rotational speed signal is obtained. |
