This study was performed on twenty-one motors. Eighteen of them are identical motors in identical service with the same model number and sequential serial numbers. This created a unique situation where motor data could be compared and analyzed. In reality every individual motor has its own unique operational characteristics, but should operate within a set of normal parameters established by industry standards. With these variations of operational characteristics in mind it was assumed these motors, with sequential serial numbers, would provide data similar enough to make valid comparisons.

Reprinted with Permission from The Snell Group