JP5957803B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine including a cooling jacket surrounding a coil end of a stator.

  The rotating electrical machine is composed of a rotor and a stator, and rotates by an interaction between a current flowing in a coil wound around the stator core and a rotor magnetic pole. Since the coil wound around the stator core generates heat when energized, cooling is performed.

  For example, Patent Document 1 discloses a motor generator cooling structure in which a coil is accommodated in a slot of a stator core and the opening of the slot that opens on the inner peripheral surface of the stator core is closed, and the front end and the rear end of the stator core are respectively end portions. A structure is disclosed that includes a cooling jacket that surrounds a coil end projecting from and forms a liquid-tight annular space. Here, by providing a refrigerant inlet below the cooling jacket and a refrigerant outlet above, the temperature rises as the refrigerant goes upward, the density becomes smaller and lighter, and the upward flow is accelerated and flows with buoyancy. Is said to not hesitate.

JP 2005-323416 A

  Patent Document 1 describes that cooling is performed by flowing a coolant with a cooling jacket surrounding a coil end protruding from a stator core as a liquid-tight structure. By the way, the coil wound around the stator core has a lead wire that is led out to energize. In Patent Document 1, since the cooling jacket has a liquid-tight structure, it is conceivable that the seal when the lead wire is pulled out from the cooling jacket becomes complicated.

  The objective of this invention is providing the rotary electric machine which suppresses a refrigerant | coolant leaking, when pulling out the lead wire of a coil from the cooling jacket surrounding a coil end.

A rotating electrical machine according to the present invention includes a rotor, a stator core disposed radially outside the rotor, a coil wound in a slot provided in the stator core, and protruding from both axial ends of the stator core, A three-phase lead wire led out from the coil end of the coil, an annular cooling jacket that is provided to the stator core and that cools both axial ends of the coil protruding from the stator core with cooling oil; The cooling jacket has three openings for drawing the lead wires to the outside, and is fitted in an elastically deformed state from the lead wires to the respective openings, and the coil protrudes within the cooling jacket. In the case where both ends are cooled by the cooling oil, a sealing member that closes the opening in a liquid-tight manner is provided.

Further, in the rotating electrical machine according to the present invention, each of the lead wires is pulled out to the outside of the cooling jacket along the axial direction of the stator core, and the seal member is fitted into each of the lead wires. It is preferable that the end of the wire is connected to the wiring member by welding .

  According to the rotating electrical machine according to the present invention, the opening provided on the jacket end surface located at the end along the axial direction of the stator core and closing the gap between the opening and the lead wire, and the opening from which the lead wire of the coil is drawn to the outside. Since the cooling jacket provided with the seal member is provided, the lead wire can be drawn out along the axial direction of the stator core. For this reason, it can prevent that a rotary electric machine enlarges with respect to radial direction, and can attain space saving of radial direction. And since the clearance gap between an opening part and a lead wire is block | closed by the sealing member, cooling oil does not leak outside. With such a simple structure, the lead wire of the coil can be pulled out without leakage of cooling oil.

  Further, if the opening and the seal member are provided for each lead wire, for example, the opening area of the opening can be reduced within a range in which each lead wire can be pulled out, and the oil tightness is improved. be able to.

  In addition, if the wiring member connected to the portion drawn out of the lead wire is provided, for example, the sealing member can be fitted into the lead wire and attached to the opening, and then the wiring member can be connected to the lead wire. Therefore, the oil tight structure can be smoothly formed while enabling the electrical connection between the lead wire and the external device by the wiring material.

It is a perspective view of the stator part in the rotary electric machine of embodiment which concerns on this invention. In the rotary electric machine of embodiment which concerns on this invention, it is a side view which shows a mode that it saw from the edge part side of the axial direction of a stator. It is sectional drawing which shows a mode that the stator shown in FIG. 1 was cut | disconnected by the XZ plane (surface parallel to a X-axis and a Z-axis) along the central axis. It is the sectional view on the AA line of FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Hereinafter, as a rotating electrical machine, a three-phase rotating electrical machine in which a U-phase, V-phase, and W-phase coil is wound around a stator core and three lead wires are drawn from the coil end will be described. It is an example of this, Comprising: It is a rotary electric machine of the structure of those other than this, Comprising: While the coil end is cooled, the rotary electric machine with the lead wire pulled out from a coil end should just be sufficient. Moreover, although the thing mounted in a vehicle is described as a rotary electric machine, this is also an illustration for description, Comprising: The rotary electric machine of uses other than a vehicle mounting may be sufficient.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

1 to 3 are views showing a configuration of a stator 14 extracted from a three-phase rotating electrical machine 10 for mounting on a vehicle. FIG. 1 is a perspective view, and FIG. 2 is a view from the end side in the axial direction of the stator. FIG. 3 is a sectional view of the stator 14 cut along an XZ plane parallel to the X axis and the Z axis.
As shown in FIGS. 1 to 3, the rotating electrical machine 10 includes a rotor 12 and a stator 14 arranged outside the rotor 12, and the stator 14 includes a stator core 20, coil ends 23 and 24, and a cooling jacket. 30 and 31 are comprised. The rotating electrical machine 10 is preferably arranged with the axial direction of the central axis 16 of the rotor 12 and the stator 14 as the horizontal direction. In order to show this, the directions of the XYZ axes, which are three orthogonal axes, are shown in FIGS. Here, the Z-axis direction is the direction of gravity (upward from the top of FIG. 1), the X-axis direction is a horizontal direction along the central axis 16, and the Y-axis direction is a horizontal direction orthogonal to the X-axis. . That is, the rotary electric machine 10 is a horizontal type in which the output shaft is disposed in the horizontal direction.

  The stator core 20 is a cylindrical member corresponding to the main body of the stator 14 and is configured by stacking a plurality of electromagnetic steel plates punched into a predetermined shape. The stator core 20 is provided with a plurality of grooves called slots extending radially from the inner peripheral side to the outer peripheral direction along the circumferential direction. The electromagnetic steel plate portion between adjacent slots is called a tooth, and a stator coil is wound around the tooth. In the case of the three-phase rotating electrical machine 10, the U-phase coil, the V-phase coil, and the W-phase coil have a predetermined winding arrangement corresponding to the three phases of the U phase, the V phase, and the W phase. Around, i.e. in a slot.

  The coil ends 23 and 24 are portions where the coil wound around the teeth of the stator core 20 protrudes from the end portions 21 and 22 at both ends in the axial direction of the stator core 20. The coil ends 23 and 24 have a shape in which windings are gathered in an annular shape outside the end portions 21 and 22 of the stator core 20.

  Lead wires 27, 28, and 29 are lead wires that are led out from one end of each of the U-phase coil, V-phase coil, and W-phase coil of the three-phase rotating electrical machine 10. The lead wires 27, 28, 29 are drawn out from either one of the coil ends 23, 24. As shown in FIG. 3, of the two end portions 21 and 22 at both ends of the stator core 20 in the axial direction, the end portion in the −X direction is referred to as the front end, and the end portion in the + X direction is referred to as the rear end. Then, the lead wires 27, 28, and 29 are drawn out from the coil end 23 on the front end portion 21 side. Thus, if the front end and the rear end of the stator 14 in the axial direction are defined, FIG. 2 is a side view as seen from the end 21 side of the front end. Note that the other ends of the U-phase coil, V-phase coil, and W-phase coil are connected to each other to be a neutral point.

  The cooling jacket 30 is an annular member having a space in which the coil end 23 and the cooling oil 60 are accommodated inside the stator core 20 with a liquid-tight space between the axial end portion 21 in the axial direction. This annular member has an annular bus shape in which the inside of a hollow donut shape is cut in half, and the opening portion of the annular member faces the end portion 21 at the front end in the axial direction of the stator core 20 to form an annular shape. A space surrounded by the recessed bottom wall of the bus and the end portion 21 is a storage space for the coil end 23 and the cooling oil 60.

  Between the annular opening of the cooling jacket 30 and the end 21 of the front end of the stator core 20 so that the cooling oil 60 does not leak from between the cooling jacket 30 and the end 21 of the axial front end of the stator core 20, They are placed in close contact so as to be liquid-tight. Since the inner peripheral side of the stator core 20 has the slot opening as described above, the inner peripheral side opening of the slot is also made liquid-tight with an appropriate sealing material. For example, the opening on the inner peripheral side of the slot is closed with resin.

  Similarly, the cooling jacket 31 is an annular member having a space in which the coil end 24 and the cooling oil 60 are accommodated in the space between the axially rear end portion 22 of the stator core 20 in a liquid-tight manner.

  The cooling oil 60 is an oil having electrical insulation, and has a function of cooling the coil ends 23 and 24 and a function of ensuring insulation between the windings at the coil ends 23 and 24 where a plurality of windings overlap. . The supply unit 25 provided in the cooling jacket 30 is an oil inlet through which the cooling oil 60 is supplied to the cooling jacket 30 side, and the discharge unit 26 is the cooling oil 60 supplied to the cooling jacket 30 side from the cooling jacket 30 and the stator core. The oil outlet is circulated through the 20 slots and the cooling jacket 31 and discharged to the outside.

  In the present embodiment, both the supply unit 25 and the discharge unit 26 are provided on the jacket side surface 39 of the cooling jacket 30. The jacket side surface 39 is a curved surface corresponding to the annular shape of the cooling jacket 30, and is a surface parallel to the central axis 16. If the cooling oil 60 is supplied to the coil end 23, the cooling function and the insulation ensuring function can be satisfied, so that the liquid level of the cooling oil 60 can be up to the upper end of the coil end 23. That is, the cooling oil 60 can be filled up above the position where the openings 32, 33, 34 from which the lead wires 27, 28, 29 are drawn out.

  Here, as the cooling oil 60 that is a refrigerant, a lubricating oil called ATF that lubricates a transmission device mounted on a vehicle can be circulated and used also in the three-phase rotating electrical machine 10. In that case, the supply unit 25 and the discharge unit 26 are connected to a lubricating oil path of a transmission device (not shown).

  With further reference to FIG. 4, the configuration of the cooling jacket 30 will be described in detail. 4 is a cross-sectional view taken along line AA in FIG. That is, it is a cross-sectional view of the cooling jacket 30 cut along an XY plane parallel to the X axis and the Y axis along the lead wire 29 drawn from the lowermost part.

  As shown in FIGS. 1 to 4, in the present embodiment, three lead wires 27, 28, and 29 are drawn out from the cooling jacket 30. The cooling jacket 30 includes openings 32, 33, 34 for drawing out the lead wires 27, 28, 29 to the outside, and seal members 35, 36, 36 for closing gaps between the openings and the lead wires 27, 28, 29. 37. That is, the openings 32, 33, 34 and the seal members 35, 36, 37 are provided for the lead wires 27, 28, 29, respectively. The opening 32 is a through-hole for drawing out the lead wire 27 to the outside, and the seal member 35 closes the gap between the opening 32 and the lead wire 27 to form an oil-tight structure. Similarly, the opening 33 and the seal member 36 are provided corresponding to the lead wire 28, and the opening 34 and the seal member 37 are provided corresponding to the lead wire 29.

  The openings 32, 33, and 34 are formed in the jacket end surface 38. The jacket end surface 38 is a wall surface of the cooling jacket 30 located at the end of the stator core 20 along the axial direction. The jacket end surface 38 is orthogonal to the jacket side surface 39 and the central axis 16. The openings 32, 33, and 34 are formed independently, and have at least a hole size (opening area) through which the lead wires 27, 28, and 29 can be inserted. In order to improve oil tightness, it is preferable that the hole size is small as long as the lead wires 27, 28, and 29 can be inserted. Is preferred.

  The lead wires 27, 28, and 29 are led out to the outside through the corresponding openings 32, 33, and 34 from the coil end 23 housed inside the cooling jacket 30. As described above, since the openings 32, 33, and 34 are formed in the jacket end surface 38, the lead wires 27, 28, and 29 are drawn out along the axial direction of the stator core 20. For example, a linear member is applied to the lead wires 27, 28, and 29, and the lead wires 27, 28, and 29 are drawn straight along the axial direction of the stator core 20.

  The seal members 35, 36, and 37 have insertion holes through which the lead wires 27, 28, and 29 are inserted, and are fitted into the openings 32, 33, and 34, respectively. The seal members 35, 36, and 37 are not particularly limited as long as they are members that close the gaps between the openings 32, 33, and 34 and the lead wires 27, 28, and 29 and can form an oil-tight structure, A high member is preferable. For example, a rubber member such as a grommet that has oil resistance and elastically deforms appropriately is suitable.

The seal members 35, 36, and 37 have, for example, a substantially cylindrical shape in which an insertion hole is formed at the center, and the outer diameter is set to be slightly larger than the hole dimensions of the openings 32, 33, and 34. The seal members 35, 36, and 37 are elastically deformed when fitted into the openings 32, 33, and 34. Moreover, the hole dimension of the insertion hole is set slightly smaller than the size (radial length) of the corresponding lead wires 27, 28, 29.

  The rotating electrical machine 10 includes wiring members 50, 51, 52 connected to portions drawn out of the lead wires 27, 28, 29. For example, the cooling jacket 30 is attached to the end portion 21 at the front end of the stator core 20 so that the lead wires 27, 28, and 29 extending in the axial direction of the stator core 20 pass through the openings 32, 33, and 34. Then, the seal members 35, 36, and 37 are fitted into the lead wires 27, 28, and 29 in the state of being drawn out from the openings 32, 33, and 34, respectively, and the openings 32, 33, and 34 and the lead wires 27 and 28 are inserted. , 29 is closed. That is, the wiring members 50, 51, 52 are connected to the lead wires 27, 28, 29 after the seal members 35, 36, 37 are attached.

  The wiring members 50, 51, and 52 are members that connect the lead wires 27, 28, and 29 to a terminal block (not shown). By using the wiring members 50, 51, and 52, the electrical connection between the lead wires 27, 28, and 29 drawn straight in the axial direction of the stator core 20 and the terminal block can be facilitated. The lead wires 27, 28, 29 and the wiring members 50, 51, 52 are connected by welding, for example.

  In the present embodiment, among the openings 32, 33, 34, the opening 32 is formed at the top, the opening 34 is formed at the bottom, and the opening 33 is formed between the openings 32, 34. The intervals between the opening 33 and the opening 32 and between the opening 33 and the opening 34 are equal. The intervals between the openings 32, 33, and 34 are not particularly limited, but are preferably set so that the wiring members 50, 51, and 52 do not contact each other.

  As described above, the cooling jacket 30 of the rotating electrical machine 10 has the sealing members 35 that close the openings 32, 33, 34 provided on the jacket end surface 38 and the gaps between the openings and the lead wires 27, 28, 29. , 36, 37. As a result, the lead wires 27, 28, and 29 are drawn out along the axial direction of the stator core 20, and the rotating electrical machine 10 can be prevented from being enlarged in the radial direction, and space saving in the radial direction can be achieved. . Further, an oil-tight structure is formed by the seal members 35, 36, and 37. In this way, the lead wires 27, 28, and 29 can be pulled out of the cooling jacket 30 while ensuring oil tightness.

The above embodiment can be appropriately changed in design as long as the object of the present invention is not impaired.
For example, in the above embodiment, the cooling jacket 30 and the coil end 23 have an annular shape with the central axis 16 as the concentric axis, but the cooling jacket 30 is eccentrically arranged upward with respect to the coil end 23 instead of being concentric. It is good also as what is done. The cooling jacket 30 may have an annular shape other than a circular shape.

  In the above embodiment, the openings 32, 33, 34 and the seal members 35, 36, 37 are described as being provided for each of the lead wires 27, 28, 29, but three lead wires 27, 28, 29 are provided. One opening portion that is collectively passed may be formed in the jacket end surface 38, and one sealing member that closes the gap between the opening portion and the lead wires 27, 28, and 29 may be attached.

  The rotating electrical machine according to the present invention can be used for a rotating electrical machine that cools a coil end.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotor, 14 Stator, 16 Central axis, 20 Stator core, 21, 22 End part, 23, 24 Coil end, 25 Supply part, 26 Discharge part, 27, 28, 29 Lead wire, 30, 31 Cooling jacket 32, 33, 34 Opening, 35, 36, 37 Seal member, 38 Jacket end face, 39 Jacket side face, 50, 51, 52 Wiring material, 60 Cooling oil.

Claims (2)

A rotor,
A stator core disposed radially outside the rotor;
A coil wound in a slot provided in the stator core and protruding from both axial ends of the stator core;
A three-phase lead wire drawn out from the coil end of the coil;
An annular cooling jacket that is provided to the stator core and that cools both axial ends of the coil protruding from the stator core with cooling oil;
Three openings formed in the cooling jacket and leading the lead wire to the outside along the axial direction of the stator core ;
It is fitted in the opening, and a seal member for closing the projecting both ends of the front Symbol coils liquid-tightly the opening of the cooling jacket for cooling by the cooling oil,
Rotating electric machine with In the rotating electrical machine according to claim 1,
The seal member is fitted in each lead wire,
Each of the lead wires is drawn out to the outside of the cooling jacket along the axial direction of the stator core, and a portion of the lead wire drawn out to the outside of the lead wire and the wiring member are electrically connected .

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