| 摘要 |
<p>A microprocessor (15) of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section (11) and a load current from a current detection section (3) at a prescribed sampling period. The processor obtains a load current instant value (In) every sampling period and a corresponding sine-functional value (An) from a sine-functional value table (27) to calculate a compensation value (Jn) for the load current instant value. The processor also calculates a load current compensation total value (Jsum) by adding the compensation value by the predetermined number of times of sampling and compares the load current compensation total value with a load current reference value (Jg) to obtain a difference therebetween. In response to the difference, an instruction value for delay time that determines the output timing of a trigger signal to a switching element (1) is changed so that power consumption of the motor falls within a prescribed range.</p> |
