| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle-motor driving circuit that allows a linear motion all through the minimum number of revolutions to the maximum, with low power consumption. SOLUTION: The circuit is characterized by carrying a power-voltage variable range that makes an applied voltage variable by controlling a power voltage and a pulse-width variable range that controls a pulse width with a PWM(pulse width modulation). The power-voltage variable range is characterized by being the one that exists at the neighborhood of the minimum number of revolutions, or at the neighborhood of the maximum number of revolutions, and also characterized by applying the fixed pulse width to the minimum or the maximum pulse width. Also, the range is characterized by conducting a control of the applied voltage and the pulse width by means of a difference voltage between a control-reference voltage and a control-input voltage. |
