Resin-molded motor and a method for its manufacture

• US 5,134,327 A
• Filed: 09/12/1989
• Issued: 07/28/1992
• Est. Priority Date: 09/14/1988
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Inaki, Shigeo, Sumi, Masatomo, Kondo, Genki, Takamiya, Yutaka
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): LABALLE, CLAYTON E
• Application Number:
  US07/406,356
• Time in Patent Office: 1,050 Days
• Field of Search: 310/42, 310/43, 310/45, 310/180, 310/216, 310/217, 310/218, 310/254, 310/258, 310/89, 310/86
• US Class Current: 310/43
• CPC Class Codes: H02K 1/16 Stator cores with slots for windings
• CPC Class Codes: H02K 3/345 between conductor and core, e.g. slot insulation
• CPC Class Codes: H02K 5/08 Insulating casings
• CPC Class Codes: H02K 5/1732 radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132

Abstract

A resin-molded motor constituted by a rotor, a laminated stator having generally axially and radially extending slots defining pole pieces therebetween and resin material molded in the inner portions of the slots and over the inner ends of the slots for insulation and bonding of the laminated stator, a generally cylindrical resin material shroud at each end of the stator extending from the corresponding axial end face at the inner peripheral portion thereof and extending axially of the motor, a steel sheet bracket on the axially outer end of each of the shrouds and having journal means therein supporting the rotor, a plurality of windings around the pole pieces of the stator and having axially outer coil ends against the shrouds, a connector having connector terminals to which conductor ends of the windings are connected for supplying power to the windings, and a housing of resin material molded around the stator, the windings, the shrouds, the brackets and the connector with the terminals exposed from the housing.

Claims

1. A resin molded motor comprising:

a rotor;

a laminated stator having generally axially and radially extending slots defining pole pieces therebetween and resin material molded in the inner portions of the slots and over the inner ends of the slots for insulation and bonding of the laminated stator;

a generally cylindrical resin material shroud at each end of said stator extending from the corresponding axial end face at the inner peripheral portion thereof and extending axially of the motor;

a steel sheet bracket on the axially outer end of each of said shrouds, each said steel sheet bracket having a means for preventing resin from flowing into an inner peripheral portion of said stator during molding, said means comprising a ring-shaped projection on an outer surface thereof for pressing against a mold component and a portion thereof pressing against a said shroud, and having journal means therein supporting said rotor;

a plurality of windings around the pole pieces of said stator and having axially outer coil ends against said shrouds;

a connector having connector terminals to which conductor ends of said windings are connected for supplying power to said windings; and

a housing of resin material molded around said stator, said windings, said shrouds, said brackets and said connector with said terminals exposed from said housing.

2. A resin molded motor comprising:

a rotor;

a laminated stator having generally axially and radially extending slots defining pole pieces therebetween and resin material molded in the inner portions of the slots and over the inner ends of the slots for insulation and bonding of the laminated stator;

a generally cylindrical resin material shroud at each end of said stator extending from the corresponding axial end face at the inner peripheral portion thereof and extending axially of the motor;

a steel sheet bracket on the axially outer end of each of said shrouds and having journal means therein supporting said rotor;

a plurality of windings around the pole pieces of said stator and having axially outer coil ends against said shrouds;

a connector having connector terminals to which conductor ends of said windings are connected for supplying power to said windings; and

a housing of resin material molded around said stator, said windings, said shrouds, said brackets and said connector with said terminals exposed from said housing;

wherein said stator is comprised of a magnetic pole member having a pair of axially spaced core sheet units each having a plurality of circumferentially spaced radially extending sheet pole pieces and connections connecting the radially inner ends of said sheet pole pieces to form a ring, and further having a plurality of independent radially spaced laminated pole pieces held between and supported by the sheet pole pieces of said core sheet units, and an annular yoke member around said magnetic pole member and engaged with the radially outer ends of said pole pieces, said connections connecting the radially inner ends of said sheet pole pieces to form a ring having axially extending recesses on the inner circumferential surface thereof.

3. A motor as claimed in claim 2 wherein the radially inner ends of the projections on said yoke have radially inwardly extending projections thereon fitted between said laminated pole pieces, and the axially inner ends of said projections have axially extending notches therein.

4. A resin molded motor comprising:

a rotor;

a laminated stator having generally axially and radially extending slots defining pole pieces therebetween and resin material molded in the inner portions of the slots and over the inner ends of the slots for insulation and bonding of the laminated stator;

a generally cylindrical resin material shroud at each end of said stator extending from the corresponding axial end face at the inner peripheral portion thereof and extending axially of the motor;

a steel sheet bracket on the axially outer end of each of said shrouds and having journal means therein supporting said rotor;

a plurality of windings around the pole pieces of said stator and having axially outer coil ends against said shrouds;

a connector having connector terminals to which conductor ends of said windings are connected for supplying power to said windings; and

a housing of resin material molded around said stator, said windings, said shrouds, said brackets and said connector with said terminals exposed from said housing;

wherein each bracket has a ring-shaped portion projecting axially toward the corresponding shroud and a plurality of radially outwardly extending projections on said ring-shaped portion, and the axially outer end of each of said shrouds has a ring-shaped groove therein into which the axially inwardly facing end of said ring-shaped portion of the corresponding bracket is engaged, and said groove has a plurality of radially outwardly extending pocket-shaped portions spaced at intervals therearound and into which said radially outwardly extending projections are engaged.

5. A motor as claimed in claim 4 wherein each of said pocket-shaped recesses is positioned between adjacent windings.