DISTRIBUTION DEALER BULLETIN
B22DB92055
01234567-5-12345XX89XX
March 27, 1992


SUBJECT: ABOUT SO-CALLED "HIGH EFFICIENCY" MOTORS


Dear MILNOR Dealer:

We have recently been asked if MILNOR uses "high efficiency "motors.

We are proud to assure you that our motors have the highest possible efficiency commensurate with our applications. This has been our policy for more than 20 years - long before so-called "high efficiency" motors came into their current popularity.

Starting about 25 years ago, most off-the-shelf motors tend to be what is known in the motor industry as "dirty" - because they were designed with minimum copper and iron. This causes a motor to quickly become "saturated" with magnetic flux if the voltage rises only a few volts above nominal. Once a motor is saturated with magnetic flux, the amps go up almost uncontrollably - and the motor gets as hot as hell. We plowed new ground by setting up standard motor specifications that required our motors draw no more amperes at full load with 110% of nominal voltage applied compared to the rated full load amperes drawn with nominal voltage applied.

Such a specification was very special in the late 60's. We paid a lot more for our motors as a consequence. (Ours was not a new philosophy as motors in the 50's and early 60's were built that way - but the rush to lower costs by the electric motor industry - plus the advent of new higher performance motor components - led motor manufacturers to build motors that were designed far closer to the limit than before.

It is true that our motors do not meet the exact criteria for the so -called "high efficiency" standards - because, on average, our efficiencies are but a few percentage points lower than what the industry has recently agreed can be called "high efficiency". However, motors meeting the current "high efficiency" standards have up to 30% less starting torque. And, since most of our applications are very sensitive to starting torque, this means that nearly 1.5 time bigger motor would be required to start many of our loads (i.e. Where we now have a 10 HP we would probably have to use a 15 HP just to get our machine to start turning). Then, once our machine was up to speed, the 15 HP motor would run with only a 10 HP load or even less. Since all motors - including the "high efficiency" variety - exhibit their highest efficiency only a full load, the result would actually be a less efficient motor application than we have now!

So, our motors truly have the highest efficiency possible!

We are proud to share this information with you.

Thanks for your continuing confidence.

PELLERIN MILNOR CORPORATION

Norvin L. Pellerin
Director of Engineering

NLP/kf