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Home / Various / AC Motor Speed Controller Circuit
AC Motor Speed Controller Circuit
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motor controllers
triac
This triac-based 220V AC motor speed controller circuit is designed for controlling the speed
of small household motors like drill machines. The speed of the motor can be controlled by
changing the setting of P1. The setting of P1 determines the phase of the trigger pulse that
fires the triac. The circuit incorporates a self-stabilizing technique that maintains the speed of
the motor even when it is loaded.
220VAC Motor Speed Controller Schematic
For example, when the motor of the drill machine is slowed down by the resistance of the
drilled object, the counter-EMF of the motor also decreases. This results to a voltage increase
in R2-P1 and C3 causing the triac to be triggered earlier and the speed increases accordingly.
Related Products: Motors | AC Motors | Brushless DC Motors
Printed circuit board layout of the motor speed controller
Another version found here.
If the main use for this circuit is to control the brightness of a light bulb, RS and CS are not
necessary.
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88 Comments
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agustindazagmail-com
Has anyone else noted the noise generated by the AC motor when controlling using a
Triac with phase shift?
Has anyone experimented with the Snubber circuit (C1, C2 and R1 in the original
circuit above) to try to minimize the electrical noise on the motor?
Any success?
Posted on March 14th 2017 | 7:24 pm
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shinekprabymail-com
Dear Sir,
Happy new year
I used this circuit in my washing machine, it gets desirable speed for spin but for wash
(when I reduced and set the speed in potentiometer) it is not starting as it does not get
the required surge.When I move the potentiometer, it runs in more speed then I
reduced the speed by turning the potentiometer and switched off the motor.Now the
position of the potentiometer is perfect as per the speed I required but when I start it
again it does not start as it does not gets enough surge. I have used 500K
potentiometer.Can you please suggest, which components should I used to get enough
surge in more resistance.
Thanks,
Shine
Posted on December 30th 2016 | 9:01 am
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haythem
Hi My Dear I need to control this with Arduino with time can you help me ?
Posted on December 27th 2016 | 9:27 pm
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jon-matiszyahoo-ca
just wondering what the values would be for 120v mains and 1hp motor?
Im going to try to convert a washing machine universal motor to a wood lath drive.
thanks
Posted on July 28th 2016 | 4:09 am
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ArBiNd
if my P1 is set to a fixed resistance R, will the motor speed be the same for different ac
input e.g 220V & 190V?
Posted on January 16th 2016 | 9:59 am
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Nikhil
which triac and diac should I use for 2000W heater load,and also value of capacitor.
provide ckt if possible
Posted on January 15th 2016 | 11:36 am
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suleiman
Why the diac , what is the function,
Posted on December 22nd 2015 | 5:57 am
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Jim Keith
The DIAC is a triggering device it blocks until the voltage across it exceeds
about 28V at this point, it breaks over and dumps the charge stored in C4 into
the TRIAC gate. This provides a high current, fast rise time gate pulse.
Posted on December 22nd 2015 | 6:05 am
pasan
hi sir . ! this circuit can be drive 1hp or 2hp motors ?
Posted on December 01st 2015 | 7:15 pm
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Hossam Zayed
Im building a project that requires a device to control a 3 phase induction AC motor
1.5 kw and 1400 rpm to do the following
1-reverse Motor direction
2-switch motor on/off (frequency up to 1 time per second)
3- Can be controlled by a micro controller (i.e accepts digital signal)
No need for controlling motor speed
does your circuit design provide the control device Im looking for?
thanks and waiting for your kind reply
Posted on September 12th 2015 | 7:48 am
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o
Jim Keith
This circuit is for single phase applications only. I will soon post a circuit that
will control a 3phase motor.
Posted on September 14th 2015 | 2:27 pm
Vijendra
do i need to make any changes for working with 240v cieling fan.
and which value of l1 should be use also do i need Rs and Cs to be used also can i use
BT136 and DB3 for triac and diac.
Posted on June 28th 2015 | 4:54 pm
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