| 摘要 |
PURPOSE:To perform smooth rotation control with quick response like a brush motor by providing a means, which switches the application voltage according to rotation control by pulse control and smoothes it, at the previous stage of a driver stage, which controls the current application of a stator coil. CONSTITUTION:A linear acceleration circuit 3 is provided at the previous stage 2 of a driver, which controls the timing of current application. When a transistor Q3 is turned on or turned off by a PWM control signal (to be exact, an inversion signal), driving power voltage +Vcc is switched with the pulse width of the PWM control signal. This switching waveform is smoothed with a capacitor C1 and becomes a smoothly changed waveform, and the excitation of the coil also is performed with smooth change. Accordingly, the same control as changing the supply voltage to a conventional brush motor by drop control control method is performed. |
