| 摘要 |
PURPOSE:To simplify the control energization by energizing by pulse modulation an AC motor having plural phases synchronously with the phases, thereby individually controlling the energizing times of the phases. CONSTITUTION:An 8-bit counter 4 inputs clock pulses 2a from a clock generator 2, counts a time, outputs counter data 4a of a reference signal, and generates a PWM period pulse 4b synchronously with the counter zero time. A control microcomputer 6 performs a digital control calculation in accordance with a control program to obtain ON time data of PWM in U, V, W phases and executes an interrupt whenever the pulse 4b is inputted as an interrupt signal. The interrupt signal is used to simultaneously turn ON the PWM signals of the phases in a software manner by an interrupt routine. |
