Thursday, 25 December 2014

How to determine the pole number or synchronous speed of an AC motor from its rated RPM?



Trying to to determine the pole number or synchronous speed of the following AC motor from its rated RPM. Here are the details:


http://www.vanbodegraven.nl/en/products/ac-motors/asea-mbg-200-m-60-6/


What is its synchronous speed(stator winding frequency) and pole number?


A VFD is being used



Answer



Here is a table that has been useful to me in the past: -


enter image description here


Please also note that the motor you have linked is a standard induction motor and won't run at synchronous speed. It's likely to be a 6 pole machine running at 50Hz that would produce a synchronous speed of 1000 RPM. However there are a few other options that could be close but, as 50Hz is a standard frequency I suggest it is a 6 pole machine.


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