| 摘要 |
PURPOSE:To reduce a reactive current by additionally connecting the second resistance element between the first load variation setting resistance element and a reference voltage source, and connecting the third resistance element between input terminals of a differentiator. CONSTITUTION:A speed setting resistor 4 is connected between a load variation setting resistor 2 and a reference voltage source 5, and a resistor 3 is further connected between the connecting point of a reference voltage source 5 and the resistor 4 and one input terminal of a differentiator 6. The differentiator 6 compares a voltage generated at the resistor 4 and the source 5 with the counterelectromotive force of a DC motor 1, and drives output transistors 7, 8 of current mirror structure by the output. With such a construction, a speed controller of the DC motor which can readily regulate with less number of parts with less reactive current and improve the load variation characteristic.
|
