| 摘要 |
PURPOSE:To reduce exciting torque quickly and reliably, by detecting rotary acceleration at each rotary angle position in single revolution of main rotary shaft then calculating control amount through utilization of rotary speed having phase corrected by the detected rotary acceleration. CONSTITUTION:A microcomputor 38 obtains interval of rotary pulse signal 25 and calculates rotary speed and rotary acceleration based on the interval. Rotary speed and rotary acceleration calculated during single revolution are compared to obtain a minimum rotary speed and a minimum rotary acceleration or a maximum rotary speed and a maximum phase angle of rotary acceleration. Then a current command value to be provided to a motor element 20 of compressor in order to equalize the rotary speed and a speed command at each rotary angle during single revolution is calculated, and lead angle compensation is carried out by a phase angle between the rotary speed and the rotary acceleration so as to output the compensated value during next revolution. The control signal is fed through a base driver 35 to an inverter 36. |
