Quick question regarding Induction Machines (3 phase)

Thread Starter

jegues

Joined Sep 13, 2010
733
Why is that we desired our induced voltage to be a sine wave when working with 3 phase induction machines?
 

crutschow

Joined Mar 14, 2008
23,544
Why is that we desired our induced voltage to be a sine wave when working with 3 phase induction machines?
An AC motor rotates at the speed determined by the fundamental sine wave frequency and the number of motor poles. Anything other than a sine wave has harmonics at higher frequencies which do not contribute to the fundamental magnetic field and thus to driving the motor. The energy from these harmonics is dissipated as waste heat in the motor which is obviously undesirable.
 

jimkeith

Joined Oct 26, 2011
540
The source voltage is a sine wave--that is what our electric utilities generate--as a result the induced wave will also be sine wave.
 
Top