| 摘要 |
PURPOSE:To obtain high speed driving characteristic and efficiency equivalent to or higher than those of a 2-power source driving system only by a single power source by detecting the total sum of exciting currents and controlling its pulse-width modulation. CONSTITUTION:The total sum SIGMA IL of exciting currents flowing to respective windings flows to a current detecting resistor 16, and a detecting voltage VL is generated at both ends of the resistor 16. The voltage VL is temporarily amplified by an operational amplifier 10 to the order of several volts, converted to V'L, which is, in turn, input to a PWM signal generator 9. A switching transistor 3 is controlled by the output signal of the generator 9, and an output exciting voltage VD is controlled in a direction inversely proportional to the output signal of the resistor 16. |
