Electrical collecting and distributing member holding structure, electric motor, and electric motor producing method
An electrical collecting and distributing member holding structure is composed of a stator including a multiplicity of cores arranged annularly, windings wound around the multiplicity of cores respectively, and an insulator for electrical insulation between the cores and the windings, a plurality of annular electrical collecting and distributing members held around the stator to collect and distribute electric current to the windings, and a holding portion formed on the insulator. The holding portion includes a plurality of recesses formed therein. The plurality of electrical collecting and distributing members are being held in the holding portion in such a manner as to be partially received in the plurality of recesses, respectively.
1. An electrical collecting and distributing member holding structure, comprising:
a stator including a multiplicity of cores arranged annularly, windings wound around the multiplicity of cores respectively, and an insulator for electrical insulation between the cores and the windings;
a plurality of annular electrical collecting and distributing members held around the stator to collect and distribute electric current to the windings; and
a holding portion formed on the insulator, the holding portion including a plurality of recesses formed therein, the plurality of recesses being formed on top of each other in an axial direction of the stator and open in a radial direction of the stator in such a manner so as to receive and hold the plurality of electrical collecting and distributing members in the holding portion when the plurality of annular electrical collecting and distributing members are inserted inwardly in the radial direction of the stator into the plurality of recesses, respectively,
wherein the electrical collecting and distributing members integrally include a respective U shaped portion, which is formed by bending a metal conductor into a U shape, respective held portions, which are held in the holding portion, and a respective pair of separated extended portions, which are provided between both ends of the respective U shaped portion and the respective held portions, respectively, by extension in a radial direction of the annular electrical collecting and distributing members,
wherein the electrical collecting and distributing members and the windings are electrically connected together with a respective end of the windings inserted in the respective U shaped portion,
wherein the U shape portion includes a pair of extended portions extending in a radial direction and a pair of shafts extending in an axial direction as one piece, and a respective end of the windings is inserted between the pair of shafts and the pair of shafts are clamped on both sides into electrically-conductive engagement with the respective end of the winding to electrically connect the respective winding to the electrical collecting and distributing member, the extended portions of the U shaped portion remaining separated from one another.
2. The electrical collecting and distributing member holding structure according to claim 1 , wherein the plurality of electrical collecting and distributing members are inserted and held by press fitting into the plurality of recesses, respectively.
3. The electrical collecting and distributing member holding structure according to claim 1 , further comprising a locking portion provided on the holding portion to lock the electrical collecting and distributing members to prevent the electrical collecting and distributing members from slipping out of the recesses.
4. The electrical collecting and distributing member holding structure according to claim 1 , wherein the electrical collecting and distributing members and the windings are electrically connected together by caulking the respective U shaped portion with the respective end of the windings inserted therein.
5. The electrical collecting and distributing member holding structure according to claim 1 , wherein the respective U shaped portion is plated with tin, and the electrical collecting and distributing members and the windings are electrically connected together by heat caulking the respective U shaped portion with the respective end of the windings inserted therein.
6. An electrical collecting and distributing member holding structure, comprising:
a stator including a multiplicity of cores arranged annularly, windings wound around the multiplicity of cores respectively, and an insulator for electrical insulation between the cores and the windings;
a plurality of annular electrical collecting and distributing members held around the stator to collect and distribute electric current to the windings; and
a holding portion formed on the insulator, the holding portion including a plurality of recesses formed therein, the plurality of electrical collecting and distributing members being held in the holding portion in such a manner as to be partially received in the plurality of recesses, respectively,
wherein the electrical collecting and distributing members integrally include a respective U shaped portion, which is formed by bending a metal conductor into a U shape, respective held portions, which are held in the holding portion, and a respective pair of separated extended portions, which are provided between both ends of the respective U shaped portion and the respective held portions, respectively, by extension in a radial direction of the annular electrical collecting and distributing members,
wherein the electrical collecting and distributing members and the windings are electrically connected together with a respective end of the windings inserted in the respective U shaped portion,
wherein the U shape portion includes a pair of extended portions extending in a radial direction and a pair of shafts extending in an axial direction as one piece, and a respective end of the windings is inserted between the pair of shafts and the pair of shafts are clamped on both sides into electrically-conductive engagement with the respective end of the winding to electrically connect the respective winding to the electrical collecting and distributing member, the extended portions of the U shaped portion remaining out of contact with one another.
7. The electrical collecting and distributing member holding structure according to claim 1 , wherein a plurality of the holding portions are arranged on the stator and spaced in a circumferential direction of the stator, and the electrical collecting and distributing members are arranged in such a manner that their respective pairs of extended portions project from between pairs of the adjacent holding portions in the circumferential direction of the stator, and in inserting directions of the respective held portions into the recesses of the pairs of the adjacent holding portions, respectively.
8. The electrical collecting and distributing member holding structure according to claim 7 , wherein a pitch between the pairs of the adjacent holding portions in the circumferential direction of the stator accommodates a width of the respective pairs of extended portions in circumferential directions of the electrical collecting and distributing members.
9. The electrical collecting and distributing member holding structure according to claim 1 , wherein the plurality of electrical collecting and distributing members are in identical shapes.
10. The electrical collecting and distributing member holding structure according to claim 9 , wherein at least some of the plurality of windings are bent depending on locations of the plurality of electrical collecting and distributing members, respectively, in an axial direction of the stator.
11. The electrical collecting and distributing member holding structure according to claim 1 , wherein the plurality of recesses are being formed side by side in a radial direction of the stator, and are open in an axial direction of the stator.