JP5691759B2 - Distributed winding type electric rotating machine - Google Patents

Description

  The present invention relates to a structure of a stator cooling channel of a distributed winding type rotary electric machine.

  A rotating electrical machine such as a motor, a generator, or a motor generator having both functions includes a stator around which a coil is wound and a rotating rotor. When a current flows through the stator coil, the stator coil generates heat. Therefore, in these rotating electrical machines, it is necessary to cool the stator coil. An air cooling system is also used for cooling, but an oil cooling system with better cooling efficiency is often used in high-power rotating electrical machines used in recent automobiles and the like.

  Since the stator is often housed in a cylindrical case, it is proposed that the cylindrical case that houses the stator be a hollow cooling jacket and that the cooling jacket be provided with a groove to flow cooling oil on the inner surface of the cooling jacket. (For example, refer to Patent Document 1). In addition, in the stator of a motor that is assembled by combining a split stator in a cylindrical shape with a fastening ring and housing the combined stator in a case, a flow path through which cooling oil flows by a convex shape or partition convex shape on the outer surface of the fastening ring or the inner surface of the case And a method of cooling the stator has been proposed (see, for example, Patent Document 2).

JP 2009-17777 A JP 2010-226918 A

  By the way, there are distributed winding and concentrated winding as a method of winding a coil around the stator. In the case of distributed winding, the coil is wound by being divided into a plurality of teeth of the stator core, and therefore, a transition wire from one tooth to the next tooth is disposed at the axial end of the stator core. The plurality of wires swell on the axial end surface of the stator core to form a coil end. When the rotating electrical machine is operated, the coil end also generates heat and its temperature rises. However, in the conventional techniques described in Patent Documents 1 and 2, there are many cases where the stator core cannot be effectively cooled even though the outer surface of the stator can be cooled. In addition, it is conceivable to cool the stator and the coil end by blowing cooling oil from the upper side of the stator case. However, it is difficult to effectively cool the coil end without the cooling oil reaching the coil end. there were.

  An object of the present invention is to effectively cool a coil end in a distributed winding type electric rotating machine.

A rotating electrical machine according to the present invention is a distributed winding type rotating electrical machine including an outer cylindrical ring to which a stator is fixed, and a one-side coil end disposed adjacent to the outer cylindrical ring and one axial side. provided on the outer peripheral surface of the cylindrical ring, a plurality of cooling oil passage for flowing the cooling oil supplied to the upper toward the circumferential direction of the outer cylinder ring in the direction of one side coil end, the outer periphery of the outer cylinder ring Provided with a plurality of cooling oil flow paths formed between a plurality of guide vanes that are attached to the surface up and down and curved so that the shape seen from the outer diameter side goes downward toward the one side coil end Of the plurality of guide vanes, the upstream end of the lower guide vane is further away from the one coil end than the upstream end of the upper guide vane .

  The present invention has an effect that a coil end can be effectively cooled in a distributed winding type rotating electrical machine.

It is explanatory drawing seen from the horizontal direction which shows the structure of the distributed winding type motor in embodiment of this invention. It is explanatory drawing seen from the axial direction which shows the structure of the distributed winding type motor in embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a stator 10 and a cooling oil supply pipe 30 of a distributed winding motor 100 according to an embodiment of the present invention. The illustration of other parts such as the rotor is omitted. As shown in FIG. 1, the stator 10 of the distributed winding motor 100 is disposed adjacent to an outer cylindrical ring 11 that houses a stator core and a coil therein, and an end surface in the direction of the centerline 101 of rotation from the outer cylindrical ring 11. The coil end 20 and a cooling oil supply pipe 30 disposed at the zenith portion of the outer ring 11 so as to extend in the direction of the center line 101 are provided.

  A cooling oil jet 31 is provided below the cooling oil supply pipe 30. As shown in FIG. 2, the cooling oil outlet 31 is configured to be able to inject cooling oil into a fan-shaped range having a circumferential angle θ across the vertical axis 103 of the outer cylinder ring 11.

  First, second, and third guide vanes 13, 14, and 15 are attached to the outer surface of the outer ring 11 on the left and right, respectively. Each of the guide vanes 13, 14, 15 has an inlet end 13 a, 14 a, 15 a on the side facing the cooling oil supply pipe 30 extending obliquely upward in the circumferential direction of the outer ring 11, and an outlet end 13 b, 14 b on the opposite side. , 15b are plates curved toward the coil end 20. The three guide vanes 13, 14, 15 are arranged in the order of the first guide vane 13, the second guide vane 14, and the third guide vane 15 along the direction of the center line 101 from the coil end 20 side. The inlet ends 13 a, 14 a, 15 a of the guide vanes 13, 14, 15 are arranged at intervals along the direction of the center line 101. Further, the lower part of the outer cylinder ring 11 and the lower part of the coil end 20 are arranged so as to be lower than the coolant level 51 of the cooling oil reservoir 50 in a casing (not shown).

  The cooling operation of the distributed winding motor 100 configured as described above will be described. The cooling oil accumulated in the cooling oil pool 50 at the lower part of the casing is pressurized by a cooling oil pump (not shown) and flows into the cooling oil supply pipe 30. The cooling oil that has flowed into the cooling oil supply pipe 30 is injected from the cooling oil outlet 31 of the cooling oil supply pipe 30 toward the outer peripheral surface 12 of the outer cylinder ring 11. As shown in FIG. 2, the cooling oil is sprayed from the cooling oil outlet 31 to the outer peripheral surface 12 of the lower outer ring 11 within a fan-shaped range with a circumferential angle θ. Moreover, it spreads in a fan shape also in the axial direction, and a part of the cooling oil is sprayed on the surface of the coil end 20. In the area where the cooling oil is directly sprayed, both the outer ring 11 and the coil end 20 are efficiently cooled.

  In the portion below the line 104 where the sectoral boundary line of the circumferential angle θ shown in FIG. 2 is in contact with the outer peripheral surface 12, the cooling oil ejected from the cooling oil ejection port 31 is directly applied to the surface of the outer cylinder ring 11 or the coil end 20. Without being sprayed, the cooling oil flows downward along the outer peripheral surface 12 of the outer ring 11. As shown in FIG. 1, the guide vanes 13 and 14 whose inlet ends 13 a and 14 a are above the center line 101 indicate the flow direction of the cooling oil flowing along the outer peripheral surface 12 of the outer ring 11. It changes so that it may go to the direction of the coil end 20 from the circumferential direction. Therefore, the cooling oil does not fall along the outer cylinder ring 11 from the center line 101 to the lower cooling oil reservoir 50, but flows from the outer cylinder ring 11 to the coil end 20 to effectively cool the coil end 20 that generates a large amount of heat. can do. Further, the guide vane 15 having the inlet end 15a below the center line 101 catches the cooling oil falling downward from the center line 101 and flows it toward the coil end 20, and passes the lower part of the coil end 20. It can be cooled effectively. The cooling oil that has cooled each part falls into the cooling oil reservoir 50 and is supplied again to the cooling oil supply pipe 30 by a cooling oil pump (not shown).

  The embodiment described above can cool the coil end 20 by effectively guiding the cooling oil sprayed from the upper part to the outer ring 11 to the coil end 20. In particular, the cooling oil sprayed on the outer ring 11 from above by the guide vanes 13 to 15 does not fall directly from the height of the center lines 101 and 102 into the cooling oil reservoir 50, and is cooled so as to cool the surface of the coil end 20. Since the oil flow path is formed, the cooling oil ejected from the cooling oil outlet 31 is not directly applied and is not immersed in the cooling oil reservoir 50. The temperature of B can be effectively lowered. Further, since the guide vanes 13 to 15 also function as heat radiating fins provided on the surface of the outer cylinder ring 11, the outer cylinder ring 11 can also be cooled effectively.

  In the embodiment described above, the guide vanes 13 to 15 have been described as plate-shaped, but constitute a flow path that can change the flow direction of the cooling oil from the circumferential direction to the direction of the coil end 20. The cross section may be of any shape, for example, a cross section such as a semi-cylindrical shape or a quarter cylindrical shape, or an L-shaped cross section. Moreover, you may make it adjust the length, width, etc. of the guide vanes 13-15 so that the flow volume of the cooling oil which flows along each guide vane 13-15 becomes uniform.

  10 Stator, 11 Outer cylinder ring, 12 Outer peripheral surface, 13, 14, 15 Guide vane, 13a, 14a, 15a Inlet end, 13b, 14b, 15b Outlet end, 20 Coil end, 30 Cooling oil supply pipe, 31 Cooling oil jet Outlet, 50 Cooling oil reservoir, 51 Liquid level, 100 Distributed winding motor, 101, 102 Central axis, 103 Vertical axis, 104 lines.

Claims (1)

An outer ring to which the stator is fixed;
A distributed winding electric machine including an outer ring and one side coil end disposed adjacent to one side in the axial direction,
A plurality of cooling oil flow paths provided on the outer peripheral surface of the outer cylinder ring and flowing the cooling oil supplied to the upper side from the circumferential direction of the outer cylinder ring toward the one side coil end , A plurality of cooling oil flow paths formed between a plurality of guide vanes that are attached to the outer peripheral surface vertically and are curved toward the one side coil end as the shape viewed from the outer diameter side goes downward. Prepared,
Of the plurality of guide vanes, the upstream end of the lower guide vane is farther from the one side coil end than the upstream end of the upper guide vane ,
Distributed winding rotary electric machine characterized by

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