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Synchronous motor with soft start element formed between the motor rotor and motor output shaft to successfully synchronize loads that have high inertia and/or high torque

United States Patent

8,872,465
October 28, 2014
View the Complete Patent at the US Patent & Trademark Office
A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.
Umans; Stephen D. (Belmont, MA), Nisley; Donald L. (Greenville, SC), Melfi; Michael J. (Richfield, OH)
Baldor Electric Company (Fort Smith, AK)
13/ 787,216
20130264990
March 6, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under agreement no. DE-FG36-08GO18132 awarded by the Department of Energy. The Government has certain rights in this invention.