Electricity: motive power systems – Plural – diverse or diversely controlled electric motors
Reexamination Certificate
2000-05-25
2002-03-12
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
C318S049000, C318S781000, C318S768000
Reexamination Certificate
active
06356041
ABSTRACT:
The present invention is directed to a master three-phase induction motor with satellite three-phase motors driven by a single-phase supply and method.
BACKGROUND OF THE INVENTION
As illustrated in Smith U.S. Pat. No. 4,792,740, a three-phase induction motor can be efficiently driven by a single-phase power supply by splitting the three windings into six and connecting them into two symmetrical half motors. To accomplish the technique of running a three-phase motor on a single-phase power supply there are also starting capacitors and running capacitor connections illustrated. Also the symmetrical motor may be a dual or double DELTA as shown in FIG. 14B or a dual WYE or YY as shown in FIG. 14A. In another Smith U.S. Pat. No. 6,049,188, greater details involving the use of starting capacitors, especially for high horsepower applications, are illustrated in FIG. 15 of that patent for a dual WYE connection type motor.
OBJECT AND SUMMARY OF THE INVENTION
It is an object of the present invention to provide a master three-phase induction motor with satellite three-phase motors driven by a single-phase supply and method.
In accordance with the above object there is provided a motor system having a master three-phase induction motor with three winding pairs for driving one or more of smaller horsepower satellite three-phase induction motors, the master motor being driven by a single-phase power supply having a pair of supply lines, the three winding pairs being connected into two symmetrical double DELTA or double WYE half motors each having three terminals with one terminal being common and having voltage potentials, in response to the application of said single-phase power supply, with phases substantially at 120° from each other, the plurality of satellite motors being individually and, respectively, connected to one of the sets of three terminals.
REFERENCES:
patent: 3851232 (1974-11-01), Chigwin
patent: 4792740 (1988-12-01), Smith
patent: 5300870 (1994-04-01), Smith
patent: 5545965 (1996-08-01), Smith
patent: 5760493 (1998-06-01), Outcalt et al.
Flehr Hohbach Test Albritton & Herbert LLP
Fletcher Marlon T.
Leykin Rita
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