Considering switching to VFD from Rotary

Where I work we design and build our own custom VFDs for our product line. In the early stages of us doing this we did let the Magic blue smoke out of a bunch of new motors. When we went to try to get warranty, as soon as the motor manufacturer looked at the burnt up motors the very first thing they asked was if we ran them on a VFD, When we said yes the warranty was void, and then they explained the Inverted duty motors that have a higher voltage rated insulation to withstand the PWM vs sinusoidal wave forms that are hitting them. So yes I have seen it happen first hand. This was a long time ago, most motors today are inverter duty just because it is prevalent. Many people on this site have old machines from before all this fancy electronics even existed, so the motors may or may not handle the voltage. For instance my mill has dual voltage motors that can run on either 220 or 440. This means that my motors are perfectly safe to run on a 220 VFD because the insulation system was designed to handle 440.

Here is a good explanation. https://www.automationdirect.com/products/motors/index
 
Flyinfool said:
Where I work we design and build our own custom VFDs for our product line. In the early stages of us doing this we did let the Magic blue smoke out of a bunch of new motors. When we went to try to get warranty, as soon as the motor manufacturer looked at the burnt up motors the very first thing they asked was if we ran them on a VFD, When we said yes the warranty was void, and then they explained the Inverted duty motors that have a higher voltage rated insulation to withstand the PWM vs sinusoidal wave forms that are hitting them. So yes I have seen it happen first hand. This was a long time ago, most motors today are inverter duty just because it is prevalent. Many people on this site have old machines from before all this fancy electronics even existed, so the motors may or may not handle the voltage. For instance my mill has dual voltage motors that can run on either 220 or 440. This means that my motors are perfectly safe to run on a 220 VFD because the insulation system was designed to handle 440.

Here is a good explanation. https://www.automationdirect.com/products/motors/index
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Thanks for the explanation and link.
 
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