PWM Inverters

Thread Starter

ClayJohansson

Joined Dec 13, 2015
3
I have been researching AC inverters that control 3phase ac motors with a single phase input. My question is how is the third leg made up to drive the 3 phase motor? We also use a 110AC input inverter to run a 3 phase ac motor. I understand the PWM but do not understand how the additional "legs" are produced.
 

Dodgydave

Joined Jun 22, 2012
8,670
The ac is converted to dc, and an oscillator with a microcontroller produces a 3 phase output. this is varied in voltage and frequency by the micro to suit the user settings, like a Vfd.
 

Thread Starter

ClayJohansson

Joined Dec 13, 2015
3
The ac is converted to dc, and an oscillator with a microcontroller produces a 3 phase output. this is varied in voltage and frequency by the micro to suit the user settings, like a Vfd.
Thank you! So the oscillator is what makes the other leg. Is this done through a transformer?
 
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