JP2017208900A - Stator for rotary electric machine and lead wire fixing method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine capable of simplifying fixation of lead wires and improving productivity, and to provide a lead wire fixing method for the same.SOLUTION: Provided is a stator 12 for a rotary electric machine 10, the stator 12 comprising: a stator core 13 having a plurality of slots 14 provided at a predetermined interval in a circumferential direction; and a coil segment 20 arranged on each slot 14. The stator 12 comprises a coil spring 40 arranged between the coil segment 20 and the slot inner peripheral surface 14b in each slot 14, and that presses and fixes the coil segment 20 by an elastic force in a diameter extending direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a stator for a rotating electrical machine in which a conducting wire is fixed in a slot and a method for fixing the conducting wire of the stator for a rotating electrical machine.

  In a manufacturing process of a stator for a rotating electrical machine including a stator core having a plurality of slots provided at predetermined intervals in the circumferential direction and a conducting wire disposed in the slot, a step of inserting the conducting wire into the stator core, And fixing the lead wire. As a method for fixing the conductive wire, a method in which a thermosetting resin is injected into the slot in which the conductive wire is inserted and integrated with the leaf spring and then fixed with a leaf spring, or a wedge, a looseness adjusting member and a loosening prevention spring are arranged in the slot. A fixing method is known (for example, see Patent Documents 1 and 2).

JP 2003-274593 A Japanese Patent Laid-Open No. 7-236245

  However, when fixing the lead wire using a thermosetting resin, it is necessary not only to inject the resin into the slot, but also to cure the injected resin, which increases the time required for the process and decreases the productivity. There is a fear. In addition, since the resin has a lower heat-resistant temperature than the stator core and the conductive wire, there is a possibility that the upper limit of the operating temperature of the rotating electrical machine is lowered and the performance improvement of the rotating electrical machine is hindered.

  On the other hand, when the lead wire is fixed using the wedge, the looseness adjusting member and the loosening prevention spring, it is possible to omit the injection of the resin, but the wedge, the loosening adjustment member and the loosening prevention spring are required for each slot. As a result, the number of parts is not only greatly increased, but the assembly process is complicated and the productivity may be reduced.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a stator for a rotating electrical machine and a method for fixing the conductor of the stator for the rotating electrical machine, which can simplify the fixing of the conductive wire and improve productivity. It is in.

In order to achieve the above object, the invention described in claim 1
A stator core (for example, a stator core 13 of an embodiment described later) having a plurality of slots (for example, a slot 14 of an embodiment described later) provided at predetermined intervals in the circumferential direction;
A rotating electrical machine stator (e.g., a stator 12 in an embodiment described later) including a conductive wire (e.g., a coil segment 20 in an embodiment described later) disposed in the slot,
A coil spring (e.g., disposed between the conducting wire and a slot inner circumferential surface (e.g., a slot inner circumferential surface 14b in an embodiment described later) in the slot, and presses and fixes the conducting wire by an elastic force in a diameter increasing direction The coil spring 40 of the embodiment described later is provided.

The invention described in claim 2
The stator for a rotating electrical machine according to claim 1,
In the hollow portion of the coil spring, a refrigerant channel (for example, a refrigerant channel C in an embodiment described later) is provided.

The invention according to claim 3
The stator for a rotating electrical machine according to claim 2,
The conducting wire is surrounded by insulating paper (for example, insulating paper 19 in an embodiment described later),
The insulating paper is provided with a hole through which the refrigerant can pass (for example, a hole 19a in an embodiment described later).

The invention according to claim 4
The stator for a rotating electrical machine according to any one of claims 1 to 3,
The coil spring is made of a magnetic material.

The invention described in claim 5
A stator core (for example, a stator core 13 of an embodiment described later) having a plurality of slots (for example, a slot 14 of an embodiment described later) provided at predetermined intervals in the circumferential direction, and a conductor (for example, A coil segment 20) of a later-described embodiment, and a wire fixing method for a stator for a rotating electrical machine (for example, a stator 12 of a later-described embodiment),
Inserting the conductive wire into the stator core;
A coil spring in a reduced diameter state (for example, a coil spring 40 according to an embodiment described later) wound around a winding jig (for example, a winding jig 60 according to an embodiment described later) is combined with the winding jig. A step of disposing the lead wire and a slot inner peripheral surface (for example, a slot inner peripheral surface 14b of an embodiment described later);
Releasing the winding of the coil spring by the winding jig, and pressing and fixing the conducting wire by the elastic force in the diameter expansion direction of the coil spring.

  According to the first aspect of the present invention, since the conducting wire is pressed and fixed by the elastic force in the diameter expansion direction of the coil spring, the fixing of the conducting wire can be simplified and the productivity can be improved. Further, since the injection of the resin can be omitted, the upper limit of the operating temperature of the rotating electrical machine can be raised and the performance of the rotating electrical machine can be improved.

  According to the second aspect of the present invention, since the refrigerant flow path is provided in the hollow portion of the coil spring, the conducting wire can be efficiently cooled and the performance of the rotating electrical machine can be further improved.

  According to the invention of claim 3, since the insulating paper surrounding the conducting wire is provided with the hole through which the refrigerant can pass, the cooling efficiency of the conducting wire can be further improved.

  According to invention of Claim 4, since the coil spring is formed with the magnetic material, the magnetic loss by installation of a coil spring can be reduced.

  According to the fifth aspect of the invention, not only can the coil spring be easily incorporated into the slot using the winding jig, but also the conductive wire can be securely fixed by the elastic force in the diameter expansion direction of the coil spring.

It is a front view of the stator for rotary electric machines which concerns on one Embodiment of this invention. It is a side view of the stator for rotary electric machines which concerns on one Embodiment of this invention. It is a perspective view which shows the coil segment of the stator for rotary electric machines which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. (A) is BB sectional drawing of FIG. 4, (b) is the elements on larger scale of insulation paper. It is explanatory drawing of the winding jig | tool used with the conducting wire fixing method of the stator for rotary electric machines which concerns on one Embodiment of this invention, (a) is a side view which shows a winding jig | tool and a coil spring, (b) is winding. It is a front view which shows a taking jig and a coil spring. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the conducting wire fixing method of the stator for rotary electric machines which concerns on one Embodiment of this invention, (a) is explanatory drawing of the process of inserting the coil spring of the reduced diameter state wound by the winding jig | tool into a slot. (B) is explanatory drawing of the process which releases winding of the coil spring by a winding jig | tool, and press-fixes a conducting wire with the elastic force of the diameter expansion direction of a coil spring.

  Hereinafter, an embodiment of a stator for a rotating electrical machine (hereinafter referred to as a stator of a rotating electrical machine or simply a stator) according to the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

[Stator for rotating electrical machines]
As shown in FIGS. 1 to 4, the stator 12 of the rotating electrical machine 10 is accommodated in a housing 11, and a rotor (not shown) is rotatably disposed inside the stator 12.

  The stator 12 includes a stator core 13 in which a plurality of slots 14 penetrating in the axial direction are arranged at predetermined intervals in the circumferential direction, and a stator of a plurality of phases (for example, U phase, V phase, W phase) accommodated in the slots 14. A coil 15.

  The stator core 13 is fixed to the housing 11 by inserting bolts 16 through bolt holes 17b provided in a plurality of mounting portions 17a protruding in the radial direction.

  The stator coil 15 of the rotating electrical machine 10 is a segment conductor type coil and, as shown in FIG. 3, is substantially U-shaped by a pair of leg portions 21 and a connecting portion 22 that connects both leg portions 21 at one end. A plurality of (in this embodiment, four) coil segments 20 formed in the above are aligned in a row to form one bundle, and each leg portion 21 is inserted into each slot 14, and the leg portion 21 protruding from the slot 14. Are formed by bending corresponding protruding in-phase coils in the circumferential direction.

  Coil ends 30 are formed so as to protrude from both sides of the stator core 13 in the axial direction. That is, a coil end 30R formed by joining coils of the same phase is formed on the rear surface 13R side of the stator core 13 from which the leg portion 21 protrudes from the slot 14, and on the front surface 13F side of the stator core 13 on the opposite side thereof. A coil end 30F composed of the connecting portion 22 is formed.

  As shown in FIG. 4, the stator core 13 includes a plurality of teeth 18 arranged at predetermined intervals in the circumferential direction, and slots 14 are formed between adjacent teeth 18. That is, the plurality of slots 14 are also arranged at predetermined intervals in the circumferential direction. The slot 14 has a groove shape having an opening 14 a on the inner peripheral side, and a plurality of coil segments 20 arranged in a row in the radial direction are inserted from the axial direction in a state surrounded by the insulating paper 19. In addition, one leg 21 of the four coil segments 20 and the other leg 21 of the other four coil segments 20 are arranged in each slot 14, and a total of eight plate-like coil segments are arranged. 20 is arranged. A wide portion 18 a that is formed to be wide in the circumferential direction and functions as a retaining member for the coil segment 20 is provided at the inner peripheral side end of the tooth 18.

  As shown in FIGS. 4 and 5, a coil spring 40 is disposed in the slot 14 between the coil segment 20 and the slot inner peripheral surface 14 b and presses and fixes the coil segment 20 by elastic force in the diameter increasing direction. Installed. The coil spring 40 of the present embodiment is disposed at the groove bottom portion 14c of the slot 14 and fixes the coil segment 20 by pressing the coil segment 20 against the wide portion 18a of the tooth 18 by elastic force in the diameter increasing direction.

  When the coil spring 40 is installed in the slot 14, the nonmagnetic region in the stator 12 may increase and magnetic loss may occur. In this embodiment, the coil spring is made of a magnetic material such as SUS430 or SUS304. By forming 40, magnetic loss due to the installation of the coil spring 40 is reduced.

  As shown in FIG. 5A, a refrigerant flow path C through which a refrigerant flows is provided in the hollow portion of the coil spring 40. The refrigerant is, for example, ATF (Automatic Transmission Fluid), and is introduced into the refrigerant flow path C of the coil spring 40 via the refrigerant introduction member 50 provided at one axial end side of the stator core 13 to mainly cool the coil segment 20. To do.

  As shown in FIGS. 5A and 5B, in the insulating paper 19 surrounding the coil segment 20, a plurality of holes 19 a through which the refrigerant can pass are provided in a region facing the coil spring 40. These holes 19 a increase the cooling efficiency of the coil segment 20 by bringing the refrigerant inserted into the refrigerant flow path C of the coil spring 40 into direct contact with the coil segment 20.

[Conductor fixing method for rotating electrical machine stator]
Next, a method for fixing the conducting wire of the rotating electrical machine stator 12 according to an embodiment of the present invention will be described with reference to FIGS. 6 and 7.

  The coil spring 40 is installed in the slot 14 using the winding jig 60 after inserting the coil segment 20 into the slot 14. As shown in FIGS. 6A and 6B, the coil spring 40 of this embodiment has hook portions 41 at both ends, and the winding jig 60 is a hollow portion of the coil spring 40. A cylindrical outer shaft 61 inserted into the outer shaft 61, and a rod-shaped inner shaft 62 inserted into the hollow portion of the outer shaft 61.

  A base end portion of the outer shaft 61 is provided with a position restricting portion 61 a that extends in the outer peripheral direction and restricts the axial movement of the coil segment 20. Further, the position restricting portion 61 a has one of the coil springs 40. An engaging portion 61b that engages with the hook portion 41 is projected. Further, a U-shaped engaging portion 62 a that can be engaged with the other hook portion 41 of the coil spring 40 is formed at the distal end portion of the inner shaft 62.

  6A and 6B, the engaging portion 61b of the outer shaft 61 is engaged with one hook portion 41 of the coil spring 40, and the engaging portion 62a of the inner shaft 62 is coiled. When the outer shaft 61 and the inner shaft 62 are relatively rotated in the direction in which the coil spring 40 is wound (in the direction in which the number of turns is increased) while being engaged with the other hook portion 41 of the spring 40, the coil spring 40 is wound. The diameter is reduced as the number increases (see FIG. 7A). The coil spring 40 having a reduced diameter is expanded by an elastic restoring force by releasing the winding by the winding jig 60. In FIG. 7A, the winding jig 60 is simplified.

  7A and 7B, in the manufacturing process of the stator 12, the coil segment 20 was inserted into the slot 14 of the stator core 13 and then wound around the winding jig 60. A step of arranging the coil spring 40 in the reduced diameter state together with the winding jig 60 between the coil segment 20 and the slot inner peripheral surface 14b is performed (see FIG. 7A). Thereafter, the winding of the coil spring 40 by the winding jig 60 is released, and the step of pressing and fixing the coil segment 20 by the elastic force in the diameter increasing direction of the coil spring 40 is performed.

  As described above, according to the stator 12 of the rotating electrical machine 10 of the present embodiment, the coil segment 20 is pressed and fixed by the elastic force in the diameter expansion direction of the coil spring 40, so that the fixing of the coil segment 20 is simplified and produced. Can improve the performance. Further, since the injection of the resin can be omitted, the operating temperature upper limit of the rotating electrical machine 10 can be raised and the performance of the rotating electrical machine 10 can be improved.

  Moreover, since the coolant flow path C is provided in the hollow part of the coil spring 40, the coil segment 20 can be cooled efficiently and the performance of the rotary electric machine 10 can be further improved.

  Moreover, since the insulating paper 19 surrounding the coil segment 20 is provided with a hole 19a through which a refrigerant can pass, the cooling efficiency of the coil segment 20 can be further improved.

  Further, since the coil spring 40 is formed of a magnetic material, magnetic loss due to the installation of the coil spring 40 can be reduced.

  Further, according to the lead wire fixing method of the present embodiment, the coil spring 40 can be easily incorporated into the slot 14 using the winding jig 60, and the coil spring 40 can be coiled by the elastic force in the diameter expansion direction. The segment 20 can be securely fixed.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
For example, when the coil segment 20 is sufficiently covered with an insulating material, it is not necessary to provide the insulating paper 19.
Moreover, although the coil segment 20 was illustrated as a conducting wire, the shape, number, etc. of conducting wire can be selected suitably.

12 Stator 13 Stator core 14 Slot 14b Slot inner peripheral surface 19 Insulating paper 19a Hole 20 Coil segment (conductor)
40 Coil spring 60 Winding jig C Refrigerant flow path

Claims (5)

A stator core having a plurality of slots provided at predetermined intervals in the circumferential direction;
A stator for a rotating electrical machine comprising: a conducting wire disposed in the slot;
A stator for a rotating electrical machine, comprising: a coil spring that is disposed between the conductor and an inner peripheral surface of the slot in the slot, and that presses and fixes the conductor with an elastic force in an expanding direction. The stator for a rotating electrical machine according to claim 1,
A stator for a rotating electrical machine, wherein a refrigerant flow path is provided in a hollow portion of the coil spring. The stator for a rotating electrical machine according to claim 2,
The conducting wire is surrounded by insulating paper,
A stator for a rotating electrical machine, wherein the insulating paper is provided with a hole through which a refrigerant can pass. The stator for a rotating electrical machine according to any one of claims 1 to 3,
The coil spring is a stator for a rotating electrical machine formed of a magnetic material. A stator wire fixing method for a stator for a rotating electrical machine comprising: a stator core having a plurality of slots provided at predetermined intervals in the circumferential direction; and a conductor wire disposed in the slot,
Inserting the conductive wire into the stator core;
A step of disposing a coil spring in a reduced diameter wound by a winding jig between the conductor and the slot inner peripheral surface together with the winding jig;
Releasing the coil spring by the winding jig, and pressing and fixing the conductive wire by an elastic force in the diameter-enlarging direction of the coil spring.

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