| 摘要 |
PURPOSE:To suppress a torque ripple, even if a load fluctuates, by switching a driving current through a pulse according to a rotational speed detected from a rotor and by correcting timing of a driving signal for performing the automatic correction of a neutral point through the correction of a phase. CONSTITUTION:The output of FG magnet 4 at the outer periphery of a rotor 2 is converted 5 magnetelectrically and waveform-shaped 7-1 to obtain a rectangular wave signal (b). Said signal (b) is frequency-divided 9 and counted to generate a measurement timing signal 15-1 and constant-speed controlled 14 to control the driving circuit 13-1 of a brushless motor BLM. Also, measurement timing 15-1 and BLM output (j)(+ or -)2 measure 16-1 and operate 17 a voltage to correct 18 a count and input it to an FG counter 10. Further, said signal (b) is also applied to an electronic switch 12 via start confirmation circuit 8. Normally, an oscillation starting circuit is connected with BLM circuit by said electronic switch 12 to drive the rotor. Said signal (b) is applied to each circuit to perform the automatic correction of a neutral point. |
