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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

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2 Answers 2

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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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This appears to be an Induction machine for the European market & a 3pole pair machine.

Justification?

1) referring to 380Δ connection, url is netherlands, dialcode is +31 => 50Hz AC

2) the RPM listed is 970rpm. the peak operating point of an induction machine is just below the equivalent electrical sync speed. 50Hz for a single pole machine equates to 3000rpm. 1000rpm would be the closest integer divisor

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  • \$\begingroup\$ can I open chat with you \$\endgroup\$
    – user16307
    May 8, 2015 at 0:05
  • \$\begingroup\$ we measure more than 1000 rpm like 1160 rpm. How can it be possible? \$\endgroup\$
    – user16307
    May 8, 2015 at 0:07
  • \$\begingroup\$ sounds like you hooked it upto 60Hz. 60Hz 3pole pair would have an electrical SYNC speed of 1200rpm ==> around 1100 taking into account the induction machine & slip \$\endgroup\$
    – user16222
    May 8, 2015 at 0:10
  • \$\begingroup\$ no it is 50hz in europe \$\endgroup\$
    – user16307
    May 8, 2015 at 0:11
  • \$\begingroup\$ we use a vfd but vfd cannot increase motor speed more than its synchronous speed right? \$\endgroup\$
    – user16307
    May 8, 2015 at 0:11

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