| 摘要 |
PURPOSE:To ensure stable motor operation by a method wherein beat pulsating current is removed from the DC feedback signal. CONSTITUTION:The voltage across a resistor 8 is supplied without smoothing to a high by-pass filter 11 and, simultaneously, to an arithmetic amplifier 17 through a resistor 16. The output of the high by-pass filter 11 consists only of the high frequency component of the signal it receives. The high by-pass filter 11 output is supplied to resistors 12, 14 and an arithmetic amplifier 13, where it undergoes phase inversion. Then it is sent to an arithmetic amplifier 17 through a resistor 15. The voltage across the resistor 8 and its phase-inverted high frequency component are added, the sum to be amplified at a ratio to the voltage across a resistor 18 and then yielded. This output of the arithmetic amplifier 17 is made use of as a current feedback signal. |
