Speed regulating circuit for motor of power coping saw

Details Speed regulating circuit for motor of power coping saw Speed regulating circuit for motor of power coping saw

1997-05-01

1999-05-04

Ip, Paul

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

Analog armature control

318 17, 318257, 318490, 322 40, 83 72, H02K 7065

Patent

active

059012692

ABSTRACT:
A speed regulating circuit for a motor of a power coping saw includes a DC voltage circuit, a manual speed regulating circuit, a feedback controlling circuit and a motor driving circuit. The DC voltage circuit includes a diode, a resistor, a capacitor, and a Zener diode. The manual controlling circuit includes a Zener diode and a resistance. The feedback controlling circuit includes an amplifier, a transistor, a pulse transformer. The motor driving circuit includes an SCR and a diode. The manual controlling circuit may first be set with a reference voltage signal corresponding to the intended rotational speed of the motor. The reference voltage signal is sent to the feedback controlling circuit to get a rotational speed controlling signal of a motor with respect to the variation of loads. A DC current is then supplied to the motor driving circuit for constantly rotating the DC motor despite the variation of the load.

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