How to determine the pole number or synchronous speed of an AC motor from its rated RPM?
This appears to be an Induction machine for the European market &amp; 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