| 摘要 |
<p>A motor driving apparatus enabling direct pulse width modulation driving (direct PWM driving) in a so-called sensor-less motor includes a comparison unit (2) for comparing back-electromotive voltages appearing in respective phases (1U, 1V, 1W) of a multi-motor (1), a pulse width modulating unit (7) for outputting pulse width modulated signals for rotationally driving the motor (1) based upon a rotational error signal (Verr) of the motor, a minimum pulse width detection unit (27) for detecting the minimum pulse width position of the pulse width modulated signal from the pulse width modulation means, a sample-holding unit (9) for sample-holding comparison outputs of the comparison means (2) at a timing of detection of the minimum pulse width of the pulse width modulated signal from the minimum pulse width detection unit (27), and a motor driving unit (10) for rotationally driving the motor based upon each sample-and-hold output from the sample-and hold unit (9). <IMAGE></p> |
