| 摘要 |
PURPOSE:To detect the correcting amount of a current phase even in case that the phase difference is 90 deg. or larger by providing a current phase corrector in a microprocessor, thereby accurately detecting the point that the generated torque becomes zero in a short time. CONSTITUTION:A microprocessor 18 calculates with a speed command Nref, a period T detected by a speed detector 14, and a phase difference theta detected by a rotating angle detector 17, digital/analog converts by D/A converters 19, 20 2-phase current commands ialpha, ibeta, and outputs to a current controller 21. A current phase corrector is provided in the microprocessor 18. Thus, the zero point of the generated torque is detected by utilizing that the polarity of the generated torque is different before and after the correcting mount of the current phase that the generated torque becomes zero. |
