| T O P I C R E V I E W |
| ahonda55 |
Posted - May 15 2010 : 09:58:46 AM
Hello
I have a 220v centrifuge motor, which spins at max. of 12000 RPM.
I need to make a circuit to control the speed, no problems being not accurate, simple PWM circuit.
A circuit like the light dimmer circuit aith a triac or something, i know the theory but practically i do not know which parts to suite my aplication, which TRIAC and DIAC should i use.
Many thanks in advance
Ahmed
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| 7 L A T E S T R E P L I E S (Newest First) |
| zaide |
Posted - Aug 27 2013 : 11:15:52 AM
the circuit of my mixing AC motor burned and i need circuit diagram to this motor 220- 60hz - 600W with 6 speed pleas i need circuit like it the motor AC -braun kitchen machine k700 - |
| Lkobescak |
Posted - Jun 18 2010 : 06:35:23 AM
i too strongly feel that control AC induction will do the need ful and aaron has shared a better circuit , i too share the same feeling |
| Aaron Cake |
Posted - May 22 2010 : 11:05:35 AM
Good point about the RPM...
You need to control AC induction motors by varying the frequency of the AC signal. It needs to be rectified to DC and then inverted back to AC using a variable frequency oscillator.
The circuit you posted is a light dimmer, which controls voltage by chopping pats off the AC wave.
A better circuit is here:
http://www.aaroncake.net/circuits/acmotcon.asp |
| ahonda55 |
Posted - May 16 2010 : 10:13:00 AM
Great, now i found this circuit, i think it will work but i can not determine the triac and diac numbers.
For example does a BT139 works ? datasheet here..
http://www.datasheetcatalog.com/datasheets_pdf/B/T/1/3/BT139.shtml
The circuit is the following...
Greetings
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| pebe |
Posted - May 15 2010 : 5:52:15 PM
The motor must be universal if it runs at 12000rpm.
Max speed for an induction motor is 60 x supply frequency - 3000rpm in Europe, or 3600rpm in US. That's for a 2pole machine - a 4pole is half that speed. |
| ahonda55 |
Posted - May 15 2010 : 4:52:40 PM
I do not know the type of the motor.
Please do you have example circuits for those applications ?
Thanks a lot |
| Aaron Cake |
Posted - May 15 2010 : 10:30:13 AM
Induction or universal type motor?
If it is an induction motor, you can control its speed by controlling the frequency of the AC wave powering it.
If it is a universal (brushed) motor then you can control speed by voltage (PWM). |
