| 摘要 |
PURPOSE:To reduce an overshoot and remaining vibration and to enable great noise reduction by rounding the time waveform of an applied voltage at the time of switching to an opposite polarity from a zero voltage along an exponential function and specifying the time constant of this rounding. CONSTITUTION:Capacitors C1 - C4 are connected to the terminals of resistances R2, R6, R12, and R18, connected to the bases of transistors TR1 - TR4, on the opposite side from the TRs 1 - 4. The other-terminal sides of those capacitors C1 - C4 are grounded and resistances R21 and R22 are connected to the collectors of TRs 7 and 8. When a TTL signal S1 is switched from a low level to a high level, the collector current of a TR 5 varies while delayed by the time constant determined by the resistance value of a resistance R3 and the electrostatic capacity of the capacitor C1. At this time, the applied voltage of stator winding is rounded with R/C according to the exponential function by using the capacitance C of the capacitor C1 and the resistance value R of the resistance R3. In this case, the time constant of the rounding should be >= (1/4) time as large as the characteristic period of a motor rotation system. |
