| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply feeding circuit which drives a motor as feeding suitable voltages to the motor respectively when starting/rotating the motor, and prevents wasteful power consumption. SOLUTION: A power supply feeding circuit has a motor M considered as a load 11, whose inner impedances are different from each other on starting/ rotating the motor M, a power supply voltage source 13 for driving the motor M, and a voltage drop circuit including a resistance R1 and a resistance R2 connected in parallel with a capacitor C and for dropping the voltage of the power supply voltage source 13 to feed it to the motor M. Since the impedance of the capacitor C is given by 1/jωC, it becomes low by the AC impedance component of the motor M, when starting the motor M and becomes high by the sole DC resitance component of the motor M during the rotation of the motor M. Therefore, the decrease/increase of the impedance of the motor M on starting/rotating the motor M are canceled respectively by the decrease/ increase of the impedance of the capacitor C for making possible the feedings of proper voltages to the motor M, at all times. |
