Structure for a motor/generator with an improved stator and method of manufacturing same
In a structure for a motor or generator, stator segments have a toothed portion to receive a coil. A busbar is electrically connected to the coil, and an insulator has a coil insulator portion disposed between the toothed portion and the coil and a busbar insulation portion insulatedly supporting the busbar.
1. A structure for a motor or generator, comprising:
a stator segment having a tooth portion to receive a coil and a yoke portion extending radially away from the tooth portion;
a busbar electrically connected to the coil; and
an insulator having a coil insulator portion disposed between the tooth portion and the coil and a busbar insulation portion insulatedly supporting the busbar and integrally formed with an axially-extending insulator portion insulating the busbar from the coil, the busbar insulation portion mounted in contact with a radially-extending surface of the yoke portion.
2. The structure according to claim 1 wherein the busbar insulation portion includes a first protrusion disposed adjacent the busbar to space the busbar apart from another busbar.
3. The structure according to claim 2 wherein the first protrusion includes a second protrusion that prevents the busbar from being removed from the busbar insulator portion.
4. The structure according to claim 3 , wherein the second protrusion is a hook at the end of the first protrusion.
5. The structure according to claim 1 wherein:
the stator segment is one of a plurality of stator segments arranged circumferentially into a stator, each of the stator segments including a respective tooth portion to receive a respective coil and a respective yoke portion extending radially away from the respective tooth portion;
the insulator is formed in units, each of the units corresponding to one of the plurality of stator segments and each of the units including a respective busbar insulation portion insulatedly supporting a respective busbar and integrally formed with a respective axially-extending insulator portion insulating the respective busbar from a coil associated with the one of the plurality of stator segments and the busbar insulation portion mounted in contact with a radially-extending surface of a yoke portion associated with the one of the plurality of stator segments; and
each busbar insulation portion is connected to an adjacent busbar insulation portion.
6. The structure according to claim 1 wherein the busbar insulation portion is composed of a same material as the insulator.
7. The structure according to claim 2 wherein the first protrusion is an annular rib.
8. The structure according to claim 7 wherein the first protrusion includes a second protrusion that prevents the busbar from being removed from the insulation portion.
9. The structure according to claim 8 wherein the second protrusion is a hook formed at a distal end of the rib.
10. The structure according to claim 2 , further comprising:
connection terminals projecting from the busbar.
11. The structure according to claim 10 wherein an end portion of the coil is electrically connected with at least one of the connection terminals.
12. The structure according to claim 10 wherein the end of one of the connection terminals bifurcates into two branches forming a U-shaped portion, and an end portion of the coil is electrically connected to the U-shaped portion.
13. The structure according to claim 11 wherein a tip portion of the at least one of the connection terminals has a notched recess portion, an end portion of the coil press fit into the recess portion.
14. The structure according to claim 1 wherein the insulator further comprises:
a wall-shaped insulating end portion located on an end of the tooth portion opposite the axially-extending insulator portion insulating the busbar from the coil.
15. The structure according to claim 14 wherein the wall-shaped insulating end portion extends axially and tangentially from the end of the tooth portion to support the coil on the tooth portion.
16. The structure according to claim 5 wherein each unit of the insulator further comprises:
a wall-shaped insulating end portion located on an end of tooth portion associated with the one of the plurality of stator segment opposite the respective axially-extending insulator portion insulating the respective busbar from the coil associated with the one of the plurality of stator segments.
17. A structure for a motor or generator, comprising:
a stator segment having a toothed portion to receive a coil;
a busbar electrically connected to the coil; and
an insulator having a coil insulator portion disposed between the toothed portion and the coil and a fan-shaped busbar insulation portion insulatedly supporting the busbar and integrally formed with an insulator portion insulating the busbar from the coil;
wherein adjacent busbar insulation portions each have circumferential ends for connection therebetween, respective circumferential ends opposing one another and providing projected portions along the circumferential direction to overlap with one another when connected.