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Ruchi

Stator slots will usually be a multiple of 6. The exception may be slow speed motors which may be a fractional slot configuration. For a given number of stator slots N1, there are general restrictions on number of rotor slots N2: The importance of Slot Combination on Motor Design" |N1-N2| < > P +/- 2 where P is number of poles |N1-N2| < > 3 * m * P where p is integer |N1-N2| < > 5 * P N2 should be above or below N1 by at least 15 bars or 25% of N1. N2 is generally not odd N2 should not be twice a prime number N2 should not be divisible by the number of poles Some designers prefer N1 > N2 although there are lots of exceptions N1/N2 = 24/19 is a relatively common ratio