Strain relief and support for electric motor wiring

• US 4,999,532 A
• Filed: 01/26/1990
• Issued: 03/12/1991
• Est. Priority Date: 01/26/1990
• Status: Expired due to Fees

• Current Assignee: A. O. Smith Corporation
• Original Assignee: Magnetek Universal Electric Co.
• Inventors: Bartell, Robert J.
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): Rebsch, D. L.
• Application Number:
  US07/470,618
• Time in Patent Office: 410 Days
• Field of Search: 310/68 R, 310/71, 310/254, 310/43, 336/192, 439/452, 439/456, 439/457, 439/459, 439/871
• US Class Current: 310/71
• CPC Class Codes: H02K 3/522 for generally annular cores with salient poles

Abstract

An electric motor comprising a stator having radially inwardly extending circumferentially spaced polar segments and a plastic support on each axial end of the stator. Each support has substantially the same configuration as the cross sectional configuration of the ends of the stator, including segments overlying the segments of the stator. Each segment includes an axially outwardly extending wall, and a coil is wound around each stator segment and segment of said support. Integral strain relief portions are provided on each support for connecting the coils and for connecting power leads to the ends.

Claims

1. An electric motor comprising

a stator having radially inwardly extending circumferentially spaced polar segments,

a plastic support on each axial end of the stator,

each support having substantially the same configuration as the cross sectional configuration of the respective end of the stator and including a guide overlying the segments of the stator, and

a coil wound around each support and guide of the stator member,

each guide of the plastic support including an axially extending outwardly extending wall providing a guide for the coil,

integral strain relief devices provided on the plastic support,

said integral strain relief devices being provided about the periphery of the plastic support,

each strain relief device comprising radially spaced wall having inwardly facing teeth for receiving a covered wire,

an integral wall connecting said radially spaced walls and extending axially for receiving the joined ends of connected wires.

2. The electric motor set forth in claim 1 wherein adjacent coils have leads with wire ends connected to one another and extending axially of the motor, said wires bent so that the leads extend between the teeth on the walls of one of said strain relief devices.

3. The electric motor set forth in claim 2 wherein another set of adjacent coils includes wire ends, an overload assembly having a pair of leads connected to said respective wire ends to form a pair of connected ends, each connected pair of leads extending into a respective strain relief device.

4. The electric motor set forth in claim 3 wherein one of said walls of each said strain relief device includes an integral free edge extending toward the other of said walls.

5. The electric motor set forth in any of claims 1-4 including an insulating coating over the entire stator.

6. An electric motor comprising

a stator having radially inwardly extending circumferentially spaced polar segments,

a plastic support on each axial end of the stator,

each support having substantially the same configuration as the cross sectional configuration of the respective end of the stator and including a guide overlying the segments of the stator, and

a coil wound around each support and guide of the stator member,

integral strain relief devices provided on the plastic support,

said integral strain relief devices being provided about the periphery of the plastic support,

each strain relief device comprising radially spaced wall having inwardly facing teeth for receiving a covered wire,

an integral wall connecting said radially spaced walls and extending axially for receiving the joined ends of connected wires.

7. The electric motor set forth in claim 6 wherein adjacent coils have leads with wire ends connected to one another and extending axially of the motor, said wires bent so that the leads extend between the teeth on the walls of one of said strain relief devices.

8. The electric motor set forth in claim 7 wherein another set of adjacent coils includes wire ends, an overload assembly having a pair of leads connected to said respective wire ends to form a pair of connected ends, each connected pair of leads extending into a respective strain relief device.

9. The electric motor set forth in claim 8 wherein one of said walls of each said strain relief device includes an integral free edge extending toward the other of said walls.

10. The electric motor set forth in any of claims 6-9 including an insulating coating over the entire stator.