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US 5,334,897 AGranted
Electric motor with encased housing
AssigneeNorth American Philips Corporation
InventorsDavid J. Ineson, Edward M. O'Connor, David C. Casali
Life of this patent
Estimating the term…
Abstract
A sealed electric motor is formed by means of interfitting metallic housing members and an overmolded plastic casing. The housing includes an annular groove into which the casing extends to improve both retention and sealing.
Claims31
A substantially sealed electric motor comprising:
- a. an electromechanical assembly including a stator, a plurality of windings, and a rotor electromagnetically coupled to the windings and the stator and mounted for rotation relative to the stator in response to application of an electrical current to the windings;
- b. electrical connection means facilitating external electrical connection to the windings;
- c. a shaft driven by the rotor and accessible externally of the motor, said shaft having a longitudinal axis;
- and
- d. a substantially closed housing having a plurality of separable parts, said housing substantially enclosing the electromechanical assembly and including:
- (1) a drive portion having an opening through which a length of the shaft extends out of the housing;
- and
- (2) a body portion adjacent the drive portion and extending around a distal end of the electromechanical assembly, said body portion including at least one junction between said separable parts, said body portion and each said junction being substantially impervious to a predetermined molding material;
- a casing comprising said predetermined material molded over a substantial area of the body portion which includes each said at least one junction;
- and
- at least one irregularity in an outer surface of the housing, to which an inner surface of the molded casing conforms, for retaining the casing on said housing.
8 more elements
A substantially sealed electric motor comprising:
- a. an electromechanical assembly including a stator, a plurality of windings, and a rotor electromagnetically coupled to the windings and the stator and mounted for rotation relative to the stator in response to the application of an electrical current to the windings;
- b. a shaft driven by the rotor and accessible externally of the motor, said shaft having a longitudinal axis;
- c. a substantially closed housing having a plurality of separable parts including:
- (1) a tubular member disposed around the stator;
- (2) a first end cover attached to a first end of the tubular member at a first junction for substantially closing said first end, said first junction being substantially impervious to a predetermined molding material;
- and
- (3) a second end cover attached to a second end of the tubular member at a second junction for substantially closing said second end, said second junction being substantially impervious to the predetermined molding material, and said second end cover including:
- (a) an axially extending portion having an outer surface with a radially inwardly directed channel circumventing the longitudinal axis of the shaft;
- (b) a flange including a face extending transversely from the outer surface adjacent the channel and circumventing the longitudinal axis of the shaft;
- and
- (c) an end surface having an opening through which the shaft extends out of the motor;
- d. a casing comprising said predetermined material molded over the first end cover, the tubular member and that portion of the second end cover extending from the second end of the tubular member to the flange face, said over molded casing extending into the channel;
- and
- e. electrical connection means facilitating external electrical connection to the windings.
11 more elements
Dependencies are inferred from the claim text.