3 phase AC motor control help

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nimeshasilva

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Hi all..

Is there any other way to control the speed of a 3-phase AC induction motor (ACIM) other than using an inverter? I mean, for example, a method such as, 3, single phase TRIAC control circuits combined together or something?

ON semiconductor had released a good app note (AND8011-D) regarding the single phase AC phase control, and the circuit is working like a charm. Now I need to combine 3 of them and control a small 3 phase ACIM. is it possible to do that? I think its worth asking before try.

Thank you
 

The single phase motor control is working by reducing the effective voltage to the motor, so the motor slows down. The problem is that the current will rise and the motor is effectively de-rated. A three phase motor works by the three phases setting up a rotating magnetic field which the rotor is trying to catch up with, lowering the voltages causes the same problem.
Frank
 

Thanx guys for the replies.
It seems its a ridiculous idea to speed control of a 3 phase motor using triacs. I'm giving it up.

Now I need to study more on Variable Frequency Drives instead..
 


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