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Thanks everyone for the advice. Obviously my original idea was not good. I will look up two simple VFDs since I don't need speed control for either motor.
The manual for Invertek VFDs says that an output choke is necessary when two motors are run from one inverter. They don't explain why.
Bill
Same situation appeared in lots of earlier railroad traction inverters, when one inverter is running two traction motors (one on each axle of a bogey).
reason is mostly... that the inverter is measuring the current flow out to the load, and trying to adjust it's pulse train to best meet the propulsion demand... but having two motors means you have two different slip circumstances going on, and that means the load signal at the inverter's sensing point is really goofy. By adding the output choke, the inequities of the two motors is settled beween THEM, and the load seen by the inverter is 'less wierd'.
From a simple perspective, one would think that two axles on the same bogey of a locomotive would always turn the same speed, and 'find' a way to be in-phase... but they're usually not. Even with the wheel diameters cut just perfect, wheelslip occurs as a result of wheel/rail interface variations (improper profile cut, road damage, tagging a flange in a curve, etc).
The modern solution, since inverters are much less expensive than they used to be, and much smaller too... is just to dedicate one inverter for each traction motor. ;-)
not a good enough explanation at all in my opinion.
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