Stator assembly including a core slot insert member
A stator assembly for a dynamoelectric machine in accordance with the present invention includes a stator core having a plurality of core slots in a surface thereof. Each of the core slots define a plurality of tooth members therebetween. A plurality of insert members is each fixedly received by a respective one of the core slots for lining each respective core slot. The insert members have a pair of leg members extending from a base member that form an aperture therebetween. A stator winding includes straight wire segments that are received by the insert members. The straight segments of the stator winding and the insert members are electrically insulated from one another. At least one of the extending leg members is bent over a portion of the straight wire segments in the core slots, narrowing the aperture between the extending leg members.
1. A stator assembly for an dynamoelectric machine, comprising:
a generally cylindrically-shaped stator core having a plurality of circumferentially spaced axially-extending core slots in a surface thereof and each having a respective radial depth and a substantially constant circumferential width and a plurality of tooth members therebetween, said core slots extending between a first and a second end of said stator core;
a plurality of insert members each fixedly received by a respective one of said core slots for lining each respective core slot and having a pair of leg members extending from a base member and forming an aperture therebetween, said insert members being formed from a magnetically permeable material; and
a stator winding having substantially straight wire segments received by said insert members, said substantially straight segments of said stator winding and said insert members being electrically insulated from one another,
wherein said at least one of said extending leg members is bent over a portion of said substantially straight wire segments in said core slots, narrowing said aperture between said extending leg members, an outer edge of each of said extending leg members extending to but not exceeding said radial depth of said core slots, and
wherein said tooth members are undeformed after said extending leg members are bent over.
2. The stator assembly according to claim 1 wherein said insert members are generally U-shaped.
3. The stator assembly according to claim 1 wherein each of said extending leg members is bent over a portion of said straight wire segments in said core slots to narrow said aperture between said extending leg members.
4. The stator assembly according to claim 1 wherein said aperture between said extending leg members is narrowed to a width smaller than the width of said straight wire segments.
5. The stator assembly according to claim 1 wherein said straight segments of said stator winding and said insert members are electrically insulated from one another by an insulating member on an inner surface of said insert member.
6. The stator assembly according to claim 5 wherein said insulating member is formed from a paper and polyester laminate.
7. The stator assembly according to claim 1 wherein said stator core and said insert member are each formed of a magnetically permeable material.
8. The stator assembly according to claim 7 wherein said insert member is formed from a lower loss grade of magnetically permeable material than said magnetically permeable material of said stator core.
9. The stator assembly according to claim 8 wherein said lower loss grade of magnetically permeable material is a grain oriented magnetic material.
10. The stator assembly according to claim 1 wherein said substantially straight segments of said stator winding have a substantially rectangular cross section.
11. The stator assembly according to claim 1 wherein said leg members of said insert members are press fit to the sides of said core slots.
12. The stator assembly according to claim 1 wherein said insert members are retained in said core slots by welding together respective exterior surfaces of said insert members and said core slots.
13. The stator assembly according to claim 1 wherein said insert members are retained in said core slots by adhesively bonding together respective exterior surfaces of said insert members and said core slots.
14. The stator assembly according to claim 1 wherein said stator windings are inserted in said core slots from a radially inward position.