| 摘要 |
PROBLEM TO BE SOLVED: To reduce vibration, noise, and power consumption. SOLUTION: The current path to a three-phase coil is switched smoothly, while switching either the first field-effect power transistor of first power amplifiers 11-13 or the second field-effect power transistor of second power amplifiers 15-17 by high frequency. The current application to the first power amplifier or the second power amplifier is controlled, responding to the output signal of a switching maker 34, and smooth three-phase drive current is supplied to it. Hereby, a drive force with few pulsations is obtained to rotate the disc. |
