kalt solutions
Newbie level 2
hi i want circuit for
speed control of induction motor using triac
speed control of induction motor using triac
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Hi,
There are a few problems. You may not notice this as the motor you used as load is not that high a load.
When you use phase angle control, you ARE controlling the SPEED, but you're also lower the torque. By phase angle control, you control voltage, and in turn torque is not constant and may/will cause a problem with large loads on the motor. The proper way to do it is constant V/f technique, where you change the frequency as well as the voltage. This can not be done with triac and is usually done with SPWM after rectifying the AC mains to DC.
Take a look at these very carefully:
http://ww1.microchip.com/downloads/en/AppNotes/00843a.pdf
http://ww1.microchip.com/downloads/en/AppNotes/00887a.pdf
http://ww1.microchip.com/downloads/en/AppNotes/00967A.pdf
**broken link removed**
http://www.atmel.com/dyn/resources/prod_documents/doc7545.pdf
Hope this helps.
Tahmid.