| 摘要 |
PROBLEM TO BE SOLVED: To increase the convergence speed and convergence accuracy of pulsation by offsetting the load pulsation. SOLUTION: The DC voltage obtained with an AC/DC converter 2 is switched with an inverter part 3 and is applied to a brushless motor 4 for rotating the brushless motor 4. A control circuit 10 controls an inverter part 3, so as to switch the current application of the brushless motor 4, based on the detected position of the rotor obtained with a position detecting circuit 5 on one hand, and divides one rotation into a plurality of divisions with an interval-between-position-detections computing part 10 and also clocks the time of each division, and generates corrective voltage separately for each division with a torque pattern operating part 10c, based on this clocked time. At the generation of this corrective voltage, it computes estimated coefficient S with a coefficient S generating part 10c, based on the time of each division, and generates the corrective voltage in order by this estimated coefficient S. This adds generated corrective voltage to the PWM signal from a PWM signal generator 10 with an adder 10e, and this outputs the drive signal of an inverter part 3 with a current application switch controller 10f by the PWM signal where this corrective voltage is added, and performs the offsetting of load pulsation by correcting the voltage pattern to be applied to the brushless motor. |
