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August 99 Project

This circuit allows for control of the speed of an AC motor like an electric drill. A bridge rectifier converts 120V AC voltage to DC voltage, part of which passes through a 10K ohm potentiometer. This potentiometer circuit along with 100 ohm resistors and 50uf capacitors provides gate control of the SCR, controlling motor speed. A diode protects against reverse voltage spikes. Components need ratings of 25A and 600V for the bridge rectifier and SCR, and 2A 600V for the diode. The circuit can handle loads up to 10A and requires proper heat sinking of the SCR.

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sunny hapse
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62 views1 page

August 99 Project

This circuit allows for control of the speed of an AC motor like an electric drill. A bridge rectifier converts 120V AC voltage to DC voltage, part of which passes through a 10K ohm potentiometer. This potentiometer circuit along with 100 ohm resistors and 50uf capacitors provides gate control of the SCR, controlling motor speed. A diode protects against reverse voltage spikes. Components need ratings of 25A and 600V for the bridge rectifier and SCR, and 2A 600V for the diode. The circuit can handle loads up to 10A and requires proper heat sinking of the SCR.

Uploaded by

sunny hapse
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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August Project : Motor Speed Control

This circuit will allow you to control the speed of an AC motor, for example an
electric drill. The way that this circuit works is as follows. The bridge rectifier
produces dc voltage from the 120vac line. A portion on this current passes
through the 10K ohm pot. The circuit comprised of the 10k pot, the two 100
ohm resistors and the 50uf capacitors delivers gate drive of the SCR. The diode
D1 protects the circuit from reverse voltage spikes. The ratings of the bridge
rectifier and the SCR should be 25 amps and PIV 600 volts. The diode D1
should be rated for 2 amps with PIV of 600 volts. The circuit can handle a load
up to 10 amps. The SCR should be very well heat sinked.

Motor Speed Control

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