H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 7/00 (2006.01) F04B 49/20 (2006.01) F24F 11/02 (2006.01) F24F 13/00 (2006.01)
Patent
CA 2450324
A system for variable speed control of a plurality of motors under variable load demand is provided. The system includes a constant power source and a plurality of motors having electrical circuits with switches to connect with the constant power source. The system further includes a variable speed drive for driving each of the plurality of motors at variable speed, wherein each of the plurality of motors includes a switch to connect with the variable speed drive. Each of the plurality of motors is selectively electrically connected with the variable speed drive and the constant power source via the switches, for driving the each of the plurality of motors at one of variable and constant speed in response to load demands. To prevent short cycling of the motors under situations of increasing system demand, the control algorithm for the electrical switches provides hysteresis by overspeeding one of the motors before switching from variable speed mode to constant speed mode. Similarly, hysteresis is included in the control algorithm to prevent short cycling of the motors under situations of decreasing system demand.
Carrier Corporation
Norton Rose Or S.e.n.c.r.l.,s.r.l./llp
LandOfFree
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