| 摘要 |
PURPOSE:To enable stabilized control regardless of the fluctuation of electrical time constant by sampling motor current plural times during a period of PWM pulse and employing the average value of sampled currents as a motor current for control. CONSTITUTION:An A/D converter 50 is driven according to a timing generated from an A/D conversion timing generating means 51, where the timing is driven with same period by means of a PWM synchronizing timing generating means 52 for driving a PWM pattern generating means 37. A signal is provided from the A/D converter 50 to a feedback gain multiplying means 54 after the average sampling value is obtained by means of a detection current correcting means 53. A correction coefficient is formed and provided to a current difference processing means 35 in order to process the current difference. By such arrangement, software current feedback can be controlled precisely and stably without being subjected to the fluctuation of electrical time constant. |
