Stator for electric rotary machine and fabricating method of the same

Abstract

The invention provides a stator for an electric rotary machine which can be built up without using exclusive equipment and which has superior mass-production properties and a fabrication method of the same. The stator (10) includes: a stator core assembly (20) formed by a stator core (21) and a plurality of coil bars (25); and a pair of base plate assemblies (30L, 30R) formed by base plates (31L, 31R) and a plurality of connection coils (40) and arranged at two sides of the stator core assembly (20).

Description

technical field [0001] The present invention relates to a stator of a rotating electrical machine mounted in an electric vehicle, a hybrid vehicle, and the like, and a method for manufacturing the same. Background technique [0002] Conventionally, there is known a stator of a rotating electrical machine in which coils are formed by winding windings on teeth of a stator core. In addition, as the stator of other rotating electric machines, there is also known a stator configured as follows: After inserting a plurality of segments (segments) composed of electric conductors formed in a U-shape using segmented coils into the slots of the stator core, inserting the legs A part is bent, and the ends of the segments are joined together to form a coil (for example, refer to Patent Documents 1 and 2). [0003] [Patent Document 1] Japanese Patent Laid-Open No. 2003-158840 [0004] [Patent Document 2] Specification of US Patent No. 6894417 [0005] However, in a conventional rotatin...

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Problems solved by technology

However, in the case of oil cooling, the insulation performance may be reduced due to moisture contained in the insulating oil, and there are problems such as corrosion of copper, and torque loss of the rotor due to viscous resistance of the insulating oil.

[0009] In addition, when the usual cooling method of cooling through the stator core is used for water cooling, there is a problem that the heat dissipation path becomes long, the thermal resistance cannot be suppressed, and it is difficult to obtain the desired cooling performance.

In addition, in the cooling method in which the water cooling jacket is arranged at the transition part of the coil, there is also the problem that the contact area with the conductor is small.

[0010] In addition, in a conventional rotating electrical machine in which coils are produced by winding windings on the teeth of the stator core, the windings are wound while insulating paper is sandwiched between them. Therefore, the winding process is complicated, and the insulating paper may bite into it, making it impossible to ensure proper sealing. Insulation properties

[0011] In addition, in the stators of the rotating electric machines for vehicles described in Patent Documents 1 and 2, the U-shaped electrical conductor is inserted after the insulating paper is inserted into the slot, so when the electrical conductor is inserted, it contacts the insulating paper and may bite into the insulating paper. paper without ensuring proper insulating properties

[0012] In addition, in the conventional rotating electric machine, there is a part where insulation is ensured by an insulating covering material such as enamel partially covering the winding, so there is room for improvement in the insulating performance.

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