Motor voltages / cycles
Motor voltages / cycles
(OP)
Have a 3 phase circulator pump motor(fractional HP)that is rated 220/380-418 volt @ 50 cycle.
Problem: Only availble voltages, are 208 and 460 @60 cycle
Please advise...
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RE: Motor voltages / cycles
V decrease also causes slight overload but less than 10% so probably not a problem there (especially if motor is lightly loaded anyway).
The only possible problem I can see is that both factors also tend to decrease your available torque all along the Torque-speed curve. Possible problem that you may not be able to start your load or might stall when running if load torque gets too high. But why not give it a try and see how it works.
RE: Motor voltages / cycles
Seems some euro communities are successfully utilizing USA motors using their 380-415v @50f .But what I really need to know is, is it possible, to run this euro 380-415v @50 cycle motor I possess, on a 460v @60 cycle feed . Or would it be better to configure it to it's 220v -3phase -50 f(euro) and feed it with a 208 3phase -60f . Or?
This is a very light duty heat circulator motor for a diesel genset.
Thanks for the input
RE: Motor voltages / cycles
As to the choice of whether you want to select a slightly higher voltage than nominal (460v on 400v terminal configuration) or a slightly lower voltage than nominal (208volt on 220v terminal configuration)... I would pick the higher-than-nominal voltage (460v supply) since this tends to offset (compensate for )several of the effects of the increased frequency:
#1 - Increased frequency reduces available torque at a given speed, but increased voltage increases available torque. So picking the higher voltage (as compared to nominal) lessens the probability that you will have problems meeting load torque during starting or running.
#2 - Increased frequency increases speed which increases power demand as discussed above. However, higher voltage (as compared to nominal) will enable you deliver that higher power with less current and less I^2*R losses.
I'm assuming that the unit has the same nameplate horsepower rating regardless of which taps you select.
RE: Motor voltages / cycles
RE: Motor voltages / cycles
kind regds.