JP2016010166A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress reduction of cooling efficiency due to immersion of liquid refrigerant into a slot of a stator.SOLUTION: Each shield part 35 is arranged between tips 14a of teeth 14 adjacent to each other in a peripheral direction and a portion of the coil 12, which is opposed to a cooling oil discharge port 52, is shielded by the shield part 35. Thereby, immersion of cooling oil ejected from the cooling oil discharge port 52 into a slot 15 can be suppressed by the shield part 35 and the cooling oil flows in a gap between a rotor 20 and a stator 10. Consequently, the cooling efficiency of the rotor 20 can be improved and dragging loss can be reduced.

Description

  The present invention relates to a stator of a rotating electrical machine that is disposed to face a rotor outer peripheral surface provided with a liquid refrigerant discharge port with a gap.

  In Patent Documents 1 to 3 listed below, in order to cool the rotor, liquid refrigerant is introduced into the rotor from the shaft center, and the liquid refrigerant introduced into the rotor is discharged from the discharge port on the outer peripheral surface of the rotor between the rotor and the stator. Has been released.

JP 2008-228522 A JP 2008-228523 A JP 2006-67777 A

  In Patent Documents 1 to 3, when the liquid refrigerant discharged from the discharge port on the outer peripheral surface of the rotor enters the slot through which the stator coil passes, the cooling oil flowing in the gap between the rotor and the stator decreases. In that case, the cooling efficiency is likely to decrease.

  An object of this invention is to suppress the fall of the cooling efficiency by liquid refrigerant infiltrating into the slot of a stator.

  The stator of the rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

  A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine that is disposed so as to face a rotor outer peripheral surface provided with a liquid refrigerant discharge port with a gap, and has a plurality of teeth protruding toward the rotor outer peripheral surface. Teeth tips adjacent to each other in the circumferential direction are provided with a stator core that is spaced apart from each other in the circumferential direction and has a slot formed between adjacent teeth in the circumferential direction, and a coil wound around the stator core through the slot. The gist is that a shielding portion for shielding a portion of the coil facing the liquid refrigerant discharge port is provided between the portions.

  According to the present invention, since the liquid refrigerant discharged from the liquid refrigerant discharge port on the outer peripheral surface of the rotor can be prevented from entering the slots of the stator, the liquid refrigerant that flows in the gap between the rotor and the stator. Can be prevented, and a decrease in cooling efficiency can be suppressed.

It is a figure which shows schematic structure seen from the direction orthogonal to the rotor rotating shaft of a rotary electric machine provided with the stator which concerns on embodiment of this invention. It is a figure which shows schematic structure seen from the direction along the rotor rotating shaft of a rotary electric machine provided with the stator which concerns on embodiment of this invention. It is a figure which shows schematic structure seen from the radial inside of the stator which concerns on embodiment of this invention. It is a figure which shows the other schematic structure seen from the radial inside of the stator which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the stator equivalent to the AA cross section of FIG. It is a figure which shows the other schematic structure of the stator equivalent to the BB cross section of FIG. It is a figure which shows the other schematic structure of the stator equivalent to the AA cross section of FIG. It is a figure which shows the other schematic structure of the stator equivalent to the BB cross section of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  1-3 is a figure which shows schematic structure of a rotary electric machine provided with the stator 10 which concerns on embodiment of this invention. 1 shows a configuration example of the stator 10 and the rotor 20 viewed from a direction orthogonal to the rotor rotation shaft 16a, FIG. 2 shows a configuration example of the stator 10 and the rotor 20 viewed from a direction along the rotor rotation shaft 16a, FIG. 3 shows a configuration example of the stator 10 as viewed from the radially inner side. In FIGS. 2 and 3, a part of the configuration of the stator 10 and the rotor 20 is illustrated with respect to the circumferential direction, but the configuration of the remaining portion that is not illustrated is the same configuration as the illustrated portion. .

  The rotating electrical machine includes a stator 10 whose rotation is fixed, a rotor 20 that can rotate relative to the stator 10, and a rotor shaft 16 that rotates together with the rotor 20, and the stator 10 in a radial direction orthogonal to the rotor rotation shaft 16 a. The rotor 20 is disposed to face the gap with a predetermined minute gap. The stator 10 is disposed on the outer peripheral side of the rotor 20, and is disposed to face the outer peripheral surface 20 a of the rotor 20 with a gap.

  The rotor shaft 16 has a cylindrical shape in which a space 17 is formed. A rotor 20 is attached to the outer peripheral surface of the rotor shaft 16. Cooling oil as a liquid refrigerant is supplied to the internal space 17 of the rotor shaft 16. The rotor 20 includes a rotor core 21 and a plurality of permanent magnets 22 disposed on the rotor core 21. A plurality of magnet insertion holes 23 are formed in the rotor core 21 at intervals (equal intervals) in the circumferential direction of the rotor. Each permanent magnet 22 is embedded in the rotor core 21 by being inserted into each magnet insertion hole 23. In the example of FIG. 2, a pair of magnet insertion holes 23 are formed in a V shape, and each pair of V-shaped permanent magnets 22 forms a magnetic pole. However, the shape of the magnet insertion hole 23 (permanent magnet 22) may be other than the V shape.

  The rotor core 21 is provided with a cooling oil passage 51 extending in the radial direction for guiding the cooling oil supplied to the internal space 17 of the rotor shaft 16 to the gap between the rotor 20 and the stator 10. The radially inner end of the cooling oil passage 51 communicates with the internal space 17 of the rotor shaft 16. The radially outer end of the cooling oil passage 51 functions as a cooling oil discharge port 52 that opens to the outer peripheral surface 20 a of the rotor 20, and communicates with a gap between the rotor 20 and the stator 10. In the rotor 20, the direction of the magnetic flux passing through the center position in the circumferential direction (V-shaped valley position) of the magnetic pole is defined as the d axis (flux axis), and the position between the adjacent magnetic poles in the circumferential direction (90 degrees in electrical angle with the d axis). If the shifted position) is the q axis (torque axis), the cooling oil passage 51 is provided on the q axis in the example of FIG. However, the cooling oil passage 51 can be provided at a position other than the q axis, for example, at the d axis.

  The stator 10 includes a stator core 11 and a coil 12 wound around the stator core 11. Stator core 11 includes an annular yoke 13 extending along the circumferential direction, and a plurality of teeth 14 each projecting radially inward from yoke 13 toward rotor outer circumferential surface 20a. The plurality of teeth 14 are arranged at regular intervals (equal intervals) in the circumferential direction. Slots 15 are formed between adjacent teeth 14 in the circumferential direction, and a plurality of slots 15 are arranged at regular intervals (equally spaced) in the circumferential direction. Each tooth 14 and each slot 15 extend along the rotation axis direction, and the tip end portion (radial inner end portion) 14a of each tooth 14 is disposed to face the outer peripheral surface 20a of the rotor 20 in the radial direction with a gap. ing. The coil 12 passes through the slot 15 and is wound around the stator core 11 (each tooth 14). The winding method of the coil 12 here is not particularly limited, and may be distributed winding or concentrated winding, for example.

  In this embodiment, the shielding part 35 for shielding the part facing the cooling oil discharge port 52 in the coil 12 is provided between the front-end | tip parts 14a of the teeth 14 adjacent to the circumferential direction. The shielding part 35 can be comprised, for example with insulating materials, such as resin, and is fitted and fixed between the front-end | tip parts 14a of the teeth 14 adjacent to the circumferential direction. The rotational axis direction position of the shielding unit 35 coincides with the rotational axis direction position of the cooling oil discharge port 52 so that the shielding unit 35 faces the cooling oil discharge port 52 provided on the outer peripheral surface 20a of the rotor 20 in the radial direction. . The width of the shielding unit 35 in the rotation axis direction is the same as or slightly wider than the width of the cooling oil discharge port 52 in the rotation axis direction. When the rotor core 21 is configured by laminating a plurality of electromagnetic steel plates in the rotation axis direction, it is preferable to form the cooling oil discharge port 52 with several electromagnetic steel plates. The portion of the coil 12 that passes through the slot 15 is shielded by the shielding portion 35 at the position in the rotational axis direction that faces the cooling oil discharge port 52 in the radial direction, but the rotational shaft that does not face the cooling oil discharge port 52 in the radial direction. At the directional position (the position displaced in the rotation axis direction with respect to the cooling oil discharge port 52), it faces the gap between the rotor 20 and the stator 10 without being shielded by the shielding portion 35.

  In order to cool the rotor 20 (permanent magnet 22), the cooling oil supplied to the internal space 17 of the rotor shaft 16 flows radially outward in the cooling oil passage 51 by the centrifugal force when the rotor rotates. The cooling oil that has passed through the cooling oil passage 51 is discharged by a centrifugal force from a cooling oil discharge port 52 provided on the outer circumferential surface 20 a of the rotor 20, and is discharged after flowing into the gap between the rotor 20 and the stator 10. When the cooling oil ejected from the cooling oil discharge port 52 directly hits the coil 12 when the rotor 20 is cooled in this way, the coil 12 may be damaged by the injection pressure of the cooling oil or foreign matters mixed in the cooling oil. There is sex. Further, when the cooling oil ejected from the cooling oil discharge port 52 enters the slot 15, the cooling oil in the gap between the rotor 20 and the stator 10 is reduced, and the cooling performance is deteriorated. The cooling oil dischargeability (flow) from the gaps between the ten air gaps deteriorates and causes drag loss to increase.

  On the other hand, in this embodiment, the part facing the cooling oil discharge port 52 in the coil 12 is protected by the shielding part 35. Therefore, the shielding portion 35 can prevent the cooling oil ejected from the cooling oil discharge port 52 from directly hitting the coil 12. Therefore, the coil 12 can be prevented from being damaged due to the direct hit of the cooling oil, and the insulation reliability and durability reliability of the coil 12 can be improved. Further, the shielding oil 35 can prevent the cooling oil ejected from the cooling oil discharge port 52 from entering the slot 15, and the cooling oil can be reduced and discharged in the gap between the rotor 20 and the stator 10. Can be suppressed. Therefore, the cooling efficiency of the rotor 20 can be improved and drag loss can be reduced. Further, since the portion of the coil 12 that does not face the cooling oil discharge port 52 faces the gap between the rotor 20 and the stator 10, the coil 12 is cooled by the cooling oil flowing through the gap between the rotor 20 and the stator 10. be able to.

  Next, another configuration example of the shielding unit will be described. 4-6, the front-end | tip parts 14a of the teeth 14 adjacent to the circumferential direction are connected through the shielding part 35, and the teeth 14 and the shielding part 35 of the stator core 11 are integrated. 4 shows another configuration example of the stator 10 viewed from the inside in the radial direction, FIG. 5 shows a view corresponding to the AA section of FIG. 4, and FIG. 6 shows a BB section of FIG. The corresponding figure is shown. The shielding portion 35 of the stator core 11 has a rotational axis direction position that coincides with the rotational axis direction position of the cooling oil discharge port 52 so as to face the cooling oil discharge port 52 in the radial direction. The portion of the coil 12 that passes through the slot 15 is shielded by the shielding portion 35 of the stator core 11 at the position in the rotational axis direction that faces the cooling oil discharge port 52 in the radial direction, but faces the cooling oil discharge port 52 in the radial direction. In the rotational axis direction position where it does not, it is not shielded by the shielding part 35 of the stator core 11 and faces the gap between the rotor 20 and the stator 10. The coil 12 is inserted from the rotation axis direction, or the stator core 11 is a split core.

  7 and 8, an insulating paper 30 is inserted into each slot 25, and the coil 12 passes through the slot 15 and is wound around the stator core 11 (each tooth 14) via the insulating paper 30. It is disguised. 7 shows a view corresponding to the AA cross section of FIG. 4, and FIG. 8 shows a view corresponding to the BB cross section of FIG. The insulating paper 30 has a shielding part 35 that projects radially inward (rotor outer peripheral surface 20a side) from the coil 12 and shields a portion of the coil 12 that faces the cooling oil discharge port 52. The shielding portion 35 of the insulating paper 30 is disposed between the distal end portions 14 a of the teeth 14 adjacent in the circumferential direction, and the position in the rotation axis direction of the cooling oil discharge port 52 is opposed to the cooling oil discharge port 52 in the radial direction. It corresponds to the position in the rotation axis direction. The portion of the coil 12 that passes through the slot 15 is shielded by the shielding portion 35 of the insulating paper 30 at the position in the rotation axis direction facing the cooling oil discharge port 52 in the radial direction. At a position in the direction of the rotation axis that does not oppose, it faces the gap between the rotor 20 and the stator 10 without being shielded by the shielding portion 35 of the insulating paper 30.

  In the configuration examples shown in FIGS. 4 to 6 and the configuration examples shown in FIGS. 7 and 8, the shielding oil 35 prevents the cooling oil ejected from the cooling oil discharge port 52 from directly hitting the coil 12 or entering the slot 15. can do.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  10 stator, 11 stator core, 12 coil, 13 yoke, 14 teeth, 15 slot, 16 rotor shaft, 20 rotor, 21 rotor core, 22 permanent magnet, 23 magnet insertion hole, 30 insulating paper, 35 shielding portion, 51 cooling oil passage, 52 Cooling oil outlet.

Claims (1)

A stator of a rotating electrical machine that is disposed to face a rotor outer peripheral surface provided with a liquid refrigerant discharge opening with a gap,
A plurality of teeth projecting toward the outer circumferential surface of the rotor are arranged at intervals in the circumferential direction, and a stator core in which slots are formed between adjacent teeth in the circumferential direction;
A coil wound around the stator core through the slot;
With
A stator for a rotating electrical machine, wherein a shielding portion for shielding a portion of the coil facing the liquid refrigerant discharge port is provided between tip portions adjacent to each other in the circumferential direction.

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