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I have two different AC motor drivers and I need to test them for energy efficiency in an analysis tool (I know only LtSpice).

But I don't know how to model an AC motor. Driver's circuitries are given. They are 3-phase AC motor drivers. Can you tell me how should I model an AC motor and how to do an efficiency analysis in LtSpice?

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I don't hink you can, definitely not in ltspice. Efficiency is Pout/Pin, but it depends on motor working point (velocity, acceleration, losses) , which you have to define. If you have a switching driver, it's even more complex,since power wasted on the driver almost doesn't depend on the motor, just on the current.

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  • \$\begingroup\$ If I monitor the current drawing from the supply I can calculate the total energy dissipation which is the exact thing I need. I just need to compare two AC motor driver, one will be used as reference. I see this guy ( youtube.com/watch?v=rtD-M-PhkvQ ) uses a model, I am trying to find it in LtSpice and in LinearTechnology but I could not. If I use identical motors and configure the drivers to have the same frequency and (coil) current amplitude why would it not be a good comparison? \$\endgroup\$ – Alper91 Jul 8 '16 at 12:05

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