Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-07-21
2002-03-19
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S043000, C310S072000, C417S422000, C417S423300
Reexamination Certificate
active
06359353
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a submersible motor unit for use in driving a pump when both the pump and motor unit are submerged in liquid.
A pump and motor unit has previously been submerged in water in a well. During operation of the motor unit to drive the pump, water is pumped from the well. One known pump and motor unit has a relatively large capacitor connected with one end of the unit to store electrical energy for use during starting of the electric motor. The use of a separate housing for the capacitor increases the number of parts required for the pump and motor unit and increases the complexity of the pump and motor unit. A pump and motor unit for pumping water in a well is disclosed in U.S. Pat. No. 4,546,300.
SUMMARY OF THE INVENTION
The present invention relates to a submersible motor unit for use in driving a pump with the pump and motor unit submerged in liquid. The motor unit includes a tubular housing member and a tubular inner member which are disposed in a coaxial relationship. End walls cooperate with the tubular housing member and tubular inner member to form a stator chamber between the tubular housing member and the tubular inner member. In addition, a rotor chamber is formed in the tubular inner member.
A stator is disposed in the stator chamber and extends around a rotor disposed in the rotor chamber. An annular capacitor is also disposed in the stator chamber. The annular capacitor extends around the rotor chamber. A body of potting compound is disposed in the stator chamber and at least partially encloses the stator and the annular capacitor.
REFERENCES:
patent: 3135884 (1964-06-01), Luenberger
patent: 3604964 (1971-09-01), Conrad et al.
patent: 3631275 (1971-12-01), Conrad et al.
patent: 3761750 (1973-09-01), Green
patent: 4546300 (1985-10-01), Shaikh
patent: 4649305 (1987-03-01), Morrill
Amin & Turocy LLP
F. E. Myers division of Pentair Pump Group
Nguyen Tran
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