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How to control speed of DC motor with AC power?
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Answer Posted / vidhy@....
By connecting a rectifier unit electrically, to an ac power
source to thereby supply a dc voltage to the dc motor drive
circuit;the rectifier unit is selected from the group
consisting of a bridge rectifier and a diode.
Further a voltage-stabilizing control unit,(u can
use a Metal-Oxide Semiconductor Field Effect Transistor for
this) electrically connected between the rectifier unit and
the dc motor drive circuit, and adapted to detect whether a
dc voltage supplied by the rectifier unit to the dc motor
drive circuit is a low dc voltage suitable for the
brushless dc motor; and
A voltage-stabilizing unit electrically connected
between the voltage-stabilizing control unit and the dc
motor drive circuit, said voltage-stabilizing unit being
controlled by the voltage-stabilizing control unit to
supply a stabilized dc voltage to the dc motor drive
circuit only if the voltage-stabilizing control unit
detects that the dc voltage supplied by the rectifier unit
is said low dc voltage;
wherein the dc voltage supplied from the rectifier unit is
passed through the voltage-stabilizing control unit
controlled by the voltage-stabilizing unit to turn on or
off the dc motor drive circuit, said voltage-stabilizing
control unit cutting off supply of dc voltage to the dc
motor drive circuit when a high dc voltage is detected.
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