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Is that compatible for ac fan motor?
I would like to congratulate and thank you for your WWW.
Please forgive my naivety for my questions.
1. I hope to use the SC to slow down a fan 45 Watts, may I use the ordinary small parts used by amateurs?
2. I found a discrepancy between the diagrams of the main 2 similar images and the small one #4 image.
In the main image L1 on the left is connected with C2 and R1 in the small image is connected with C3 and C4, am I right? what I have to do?
3. In the small image R3 ends unconnected.
4. I suppose that I have to connect the line to R3, am I right?
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?
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
Hi My Dear I need to control this with Arduino with time can you help me ?
just wondering what the values would be for 120v mains and 1hp motor?
I’m going to try to convert a washing machine universal motor to a wood lath drive.
thanks
Reference the 3rd schematic above: https://www.electroschematics.com/wp-content/uploads/2009/11/motor-speed-control.gif
Several people have asked what component values would be required to operate on 110-120VAC, myself included! So, here is my version of this speed control for 110VAC operation. The component values that I figure need changing are those that determine the charge rate of the phase shift circuit feeding the Diac. Those would be the 3K3 resistor and the 500K pot. Both should be cut in half since only half the voltage is charging the phase shift circuit (15K and 2 x 100 nF). Given the Rs/Cs are filtering 110 vs. 220, I thought it might be a good idea to change Rs to 47 ohms and double the capacitance of Cs. Cf could also be doubled. When I bread-boarded this circuit, I noticed that the 250K pot (500K/2) was ineffective from 250K down to about 70K; measured at complete shut off, so I replaced the pot with a 100K linear pot. The circuit runs up to about 90% of full speed because the Triac doesn’t turn ON until the Diac conducts at around 30V; DB3 breakdown voltage. I used a Diac and a Triac different from the schematic, but locally available.
Cf 220nF (replace 100nF)
Lf 220uH
Pot 100K linear (replace 500K)
2 x 100nF
1 x 1.8K 1W (replace 3.3K)
1 x 15K
Diac DB3 or KR206
Triac BTA26-600B or KT207/400 or or BTA16-800B
Rs 47 (replace 100)
Cs 0.47uF 250V (replace 0.22uF 400V)
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?
which triac and diac should I use for 2000W heater load,and also value of capacitor. provide ckt if possible
Why the diac , what is the function,
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.
hi sir ……. ! this circuit can be drive 1hp or 2hp motors …?