JP3807089B2 - Vehicle alternator stator and method for disassembling the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle AC generator stator mounted on a passenger car, a truck, and the like, and a method for disassembling the stator.
[0002]
[Prior art]
In recent years, there has been an increasing demand for recycling of products such as automobiles from the viewpoint of environmental conservation and resource securing. It is desirable to have a method of separating them.
On the other hand, a stator for a general vehicle alternator is fixed in a silicon steel plate stator core in which a plurality of slots are formed, a stator winding made of an insulation-coated copper wire having a circular cross section, and a slot. It is made of electrically insulating paper that is interposed between the core and the stator winding to ensure electrical insulation. Further, in order to prevent a short circuit between copper wires due to damage to the insulating film due to vibration or heat, the stator winding is impregnated and fixed with a thermosetting resin having high heat resistance such as epoxy inside and outside the slot.
Also, in International Publication No. 92/06527, it is known that a stator winding is formed by inserting U-shaped electrical conductors into the plurality of slots provided in the stator core from the same direction and joining them together. Yes.
[0003]
Even in the stator of a vehicle alternator using such an electric conductor called a segment, it was necessary to impregnate the resin in order to fix the electric conductor.
[0004]
[Problems to be solved by the invention]
Thus, the stator has few types of components, and silicon steel plates and copper wires used for the stator core and the stator winding are highly valuable as recycled materials. Nevertheless, the stator windings are firmly impregnated and fixed, although some of them are reused as repair parts when the vehicle is scrapped. It was difficult to separate and reuse the iron core and stator winding.
[0005]
In view of the above problems, the present invention provides a stator for a vehicle alternator that can be easily separated and reused after being used as a stator, and a method for disassembling the stator. is there.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a stator core formed with a plurality of slots, a stator winding mounted on the stator core, and the stator core and the stator winding in the slot In a stator of a vehicle alternator provided with a sheet-like electrical insulating member interposed therebetween, the stator winding is configured by joining a plurality of electrical conductors, and the electrical conductors are A storage portion that is housed in a slot and has an axial vertical cross-sectional shape that is substantially rectangular along the shape of the slot, and a transition portion that connects the storage portions located in different slots; A bent portion having a hard composition changed is formed, one transition portion is spatially separated from the other transition portion, and the stator core, the stator winding, and the sheet-like electrical insulating member mutual mechanical anchoring is made by only The electrical conductor is a bare copper wire, and the sheet-like electrical insulation member is interposed between the electrical conductors in the slot, and the electrical insulation member comprises the stator core (32) and the electrical conductor. S-shaped cross-sectional shape for insulating between the conductor (33) and between the inner layer side accommodating portion (33a) and the outer layer side accommodating portion (33b) in the slot (35). It is a feature.
[0007]
Since the rectangular copper wire follows the slot shape, the rectangular copper wire is opposed to the inner wall of the slot in a wider area than the copper wire having a circular cross section, and is stably fixed in the slot.
In addition, since the bent portion is provided with a bent portion having a hard and changed composition, the rigidity of the transition portion is increased. For these reasons, the vibration of the electric conductor can be suppressed.
Furthermore, since the crossover part and other crossover parts are spatially separated, the crossover parts of the electrical conductors are electrically insulated from each other, and contact between the crossover parts can be prevented by the vibration suppressing effect due to the improvement of the rigidity of the crossover part. Therefore, the impregnation fixing for the electric insulation of the crossing portion is not necessary.
[0008]
Therefore, there is provided a vehicle alternator stator that facilitates separation of the stator core and the stator winding while maintaining the strength of the transition portion and the fixing force of the electric conductor to the stator core at a required level. can get. Further, the electrical conductor is a bare copper wire, and the sheet-like electrical insulation member also serves as electrical insulation between the electrical conductors in the slot, and the electrical conductor can be recycled as a copper material. It becomes easy. According to the invention of claim 2, wherein the fixed Oite to claim 1, the step of cutting a part of one of the crossover portion in the axial direction of the stator core, the step of withdrawing the electrical conductor in the axial direction There is provided a method for disassembling a stator of a vehicular AC generator, characterized in that a work for separating a core core and the stator winding is performed. Thereby, isolation | separation with an electrical conductor and a stator core can be performed easily.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an AC generator for a vehicle according to the present invention will be described based on the embodiments shown in FIGS.
[First embodiment]
FIG. 1 is a partial cross-sectional view of a main part of an automotive alternator to which a stator to which the present invention is applied is attached. The vehicular AC generator 1 includes a stator 2, a rotor 3, a frame 4 that supports the stator 2 and the rotor 3, a rectifier 5 that converts AC power into DC power, and the like.
[0010]
The rotor 3 rotates integrally with the shaft 6 and includes a Landel pole core 7, a field coil 8, slip rings 9 and 10, and cooling fans 11 and 12. The shaft 6 is connected to a pulley 20 and is driven to rotate by a traveling engine (not shown) mounted on the automobile.
The Landel-type pole core 7 is configured by combining a pair of pole cores. The Landel-type pole core 7 includes a boss portion 71 assembled to the shaft 6, a disk portion 72 extending in the radial direction from both ends of the boss portion 71, and a plurality of claw-shaped magnetic pole portions 73. Cooling fans 11 and 12 are provided at both ends in the axial direction of the Landel pole core 7, respectively.
[0011]
Suction holes 41 are provided in both axial end surfaces of the frame 4. The frame 4 is provided with a cooling air discharge hole 42 corresponding to the radially outer side of the transition portion 31 of the stator 2.
2 is a perspective view of one electric conductor 33, FIG. 3 is a perspective view from the inner peripheral side of the stator 2 showing the assembled state of the electric conductor 33 to the stator core 32, and FIG. FIG.
[0012]
The stator 2 includes a stator core 32, a plurality of electrical conductors 33, and a plurality of electrical insulating papers 34, and is supported by the frame 4. The stator core 32 is formed by superposing thin silicon steel plates, and a large number of slots 35 are formed on the inner peripheral surface thereof as shown in FIG.
The slot 35 is a groove having parallel inner walls. The cross section of the slot 35 is formed in a shape corresponding to the rectangular electric conductor 33, and the circumferential width of the slot 35 is set slightly larger than the circumferential width of the electric conductor 33 as shown in FIG. Has been. The depth of the slot 35 in the radial direction is set to be slightly larger than the width of the two electric conductors 33 in the radial direction.
[0013]
Further, the gap cannot be increased in a state where the electrical insulating paper 34 is provided between the slot 35 and the electrical conductor 33 and between the electrical conductors 33. By setting the shape and size of the slot 35 in this way, when the electric conductor 33 and the electric insulating paper 34 are stored in the slot, vibration of the electric conductor 33 therein is suppressed.
[0014]
In particular, since the electrical conductor storage portions 33a and 33b have a rectangular cross section along the inner wall of the slot, the storage portions 33a and 33b face the slot inner wall over a wide area and are stably stored. Moreover, it is fixed by the frictional force via the electrical insulating paper 34.
As shown in FIG. 2, the electric conductor 33 is a substantially U-shaped bare copper wire having a rectangular cross section. The electrical conductor 33 is formed by forming a copper wire having a circular cross section into a rectangular cross section, and is hardened compared to the copper wire having a circular cross section due to a composition change. The electrical conductor 33 includes storage portions 33 a and 33 b for slots 35 provided in the stator core 32, a bent portion 36, a joint portion 37, a skew portion 38, and a turn portion 39. Here, the bent portion refers to between the storage portion 33a or 33b and the skew portion 38, between the joint portion 37 and the skew portion 38, and the turn portion 39 is also a broad bent portion. is there.
As shown in FIG. 3, the joint portion 37 of the electric conductor 33 is configured to be positioned on one of the axial end surfaces of the stator core 32, and the outer layer side storage portion 33 b is located on the back side of the slot 35 as shown in FIG. 4. In addition, the inner layer side accommodating portion 33a is accommodated so as to be positioned on the opening side of another slot 35 separated by the magnetic pole pitch. The electrical insulating paper 34 has an S-shaped cross-sectional shape in order to insulate between the stator core 32 and the electrical conductor 33 and between the inner layer side storage portion 33a and the outer layer side storage portion 33b in the slot 35. ing. After each electrical conductor 33 is inserted into the slot 35, both ends thereof are bent in opposite directions to the circumferential direction as shown in FIG. Then, the joint portions 37 adjacent to each other in the radial direction of different electric conductors 33 are welded.
[0015]
In the lower side of the stator core 32 in FIG. 3, the crossover portion 31 is formed by the bent portion 36, the skew portion 38 and the turn portion 39, and also on the upper side, the bend portion 36, the joint portion 37 and the skew portion. A crossover 31 is formed at 38. Since the stator core 32 houses a plurality of electrical conductors 33, a plurality of crossover portions 31 are formed at both ends thereof.
[0016]
At both ends of the stator core 32, one transition part 31 is slightly spaced apart from the other transition part 31. The bent portion 36 and the turn portion 39 are harder than the storage portions 33a and 33b and have undergone composition changes due to work hardening or the like. Therefore, it is prevented that the crossing parts 31 which adjoin each other by a vibration etc. contact. The stator windings are not impregnated with resin, and are mechanically fixed only by contact between the electric conductor 33 and the electric insulating paper 34 and between the stator core 32 and the electric insulating paper 34. It is.
[Effects of Embodiment]
The stator winding of the stator 2 of the vehicle alternator 1 thus obtained is not impregnated with resin. Therefore, the separation operation of the stator winding and the stator core 32 includes the step of cutting a part of the crossover portion 31 on one side of the stator core 32 in the axial direction and the gripping of the crossover portion 31 on the other side. It can be performed by a process of drawing the conductor 33 from the stator core 32 in the axial direction.
[0017]
In this embodiment, since all the joints are arranged at substantially the same height on one of the axial end surfaces of the stator core 32, only the joints can be cut with a lathe or the like. Instead of cutting, the joint portion 37 may be separated by heating and melting the joint portion 37 locally or by chemical treatment. Thereafter, the electric conductor 33 can be pulled out from the stator core 32 while the electric conductor 33 is pulled while holding the turn portion 39 side and the bent portion 36 of the electric conductor 33 is deformed.
[0018]
In addition, the crossover portion 31 may be cut by the turn portion 39, and at that time, the electric conductor 33 can be separated from the stator core 32 as in the case where the joint portion 37 is cut.
In addition, you may cut | disconnect the bending part 36 vicinity between the accommodating part 33a or 33b and the skew part 38. FIG. In this case, it becomes easy to pull out the electric conductor 33.
In this embodiment, no impregnation with resin is performed. However, by appropriately setting the shapes and sizes of the slot 35 and the electric conductor 33, it is possible to prevent a large gap from being generated in the slot 35 and to suppress the vibration of the electric conductor 33 in the slot 35. Further, the rectangular electric conductor 33 has high rigidity with respect to the copper wire having a circular cross section as a material by work hardening, and accordingly, the vibration of the electric conductor 33 with respect to the stator core 34 is suppressed. Can do. In particular, the transition portion 31 exhibits higher rigidity than a circular cross-section material. Further, as shown in FIG. 3, each electric conductor 33 has a bent portion 36 immediately after exiting from the opening at both ends in the axial direction of the slot 35, whereby the positioning of the stator core 32 in the axial direction is ensured. The Further, the bent part 36 and the turn part 39 are harder than the storage parts 33a and 33b and the skew part 38, and the composition is changed. Therefore, the rigidity of the bending part 36 increases, and as a result, the vibration of the transition part 31 can be suppressed and the electrical conductor 33 in the transition part 31 can be prevented from being short-circuited.
[Other Embodiments]
Although the electric conductor 33 is a bare conductor in the first embodiment, it may be an electric conductor covered with an insulating resin. In this case, since the electrical insulating paper 34 only needs to insulate between the stator core 32 and the electrical conductor 33, the electrical insulating paper 34 is not sandwiched between the storage portion 33a and the storage portion 33b. It can be simplified to a cross-sectional shape. Therefore, when the electric conductor 33 is pulled out in the axial direction in order to separate the electric conductor 33 from the stator core 32, the electric insulating paper 34 and the electric conductor 33 are easily separated from each other, so that the separation process can be further simplified. The insulating resin can be removed by incineration in a process such as a heating and melting process for re-extraction of the copper material.
[0019]
In the first embodiment, the electrical insulation paper 34 is used for the insulation between the slot 35 and the electrical conductor 33. However, in addition to the electrical insulation paper 34, a sheet-like electrical insulation member such as an electrical insulation film is employed. May be.
In the first embodiment, the number of electrical conductors per slot is one pair, that is, two. However, depending on the required output for each vehicle, a large number of pairs of electrical conductors may be used as the stator core 32 and the stator windings. It has no adverse effect on the separation.
[0020]
In the first embodiment, the electric conductor 33 has a rectangular cross section. However, the electric conductor 33 may have a rectangular cross section only in the slot 35 and a round line outside the slot 35. Also in this case, since the gap can be made small in the slot 35 to suppress the vibration of the electric conductor, impregnation with resin is unnecessary.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an automotive alternator according to a first embodiment of the present invention.
FIG. 2 is a perspective view of an electric conductor according to the first embodiment of the present invention.
FIG. 3 is a perspective view from the inner peripheral side of the stator according to the first embodiment of the present invention.
FIG. 4 is a partial cross-sectional view of the stator according to the first embodiment of the present invention.
FIG. 5 is a partial cross-sectional view of a stator according to another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle alternator 2 Stator 3 Rotor 4 Frame 6 Shaft 7 Pole core 8 Field coil 9, 10 Slip ring 11 Cooling fan 12 Cooling fan 31 Transition part 32 Stator core 33 Electric conductor 33a, 33b Storage part 34 Electrical insulation paper

Claims (2)

A stator core in which a plurality of slots are formed, a stator winding mounted on the stator core, and a sheet-like electrical insulation interposed between the stator core and the stator winding in the slot In the stator of a vehicle alternator equipped with a member,
The stator winding is configured by joining a plurality of electrical conductors,
The electrical conductor has a storage portion that is stored in the slot and has a substantially rectangular shape in a vertical cross section in the axial direction along the slot shape, and a transition portion that connects the storage portions located in different slots. ,
The transition part is formed with a bent part that is hard and has changed composition, and one transition part is spatially separated from the other transition part,
Furthermore, mutual mechanical fixation is made only by the stator core, the stator winding, and the sheet-like electrical insulating member ,
The electrical conductor is a bare copper wire, and the sheet-like electrical insulation member is interposed between the electrical conductors in the slot,
The electrical insulating member includes an inner layer side storage portion (33a) and an outer layer side storage portion (33b) between the stator core (32) and the electric conductor (33) and in the slot (35). A stator for a vehicle alternator, characterized in that it has an S-shaped cross-sectional shape for insulating between them . 2. The method for disassembling a stator of an automotive alternator according to claim 1 , wherein a step of cutting part of one of the crossing portions in the axial direction of the stator core and a step of pulling out the electric conductor in the axial direction. A method for disassembling a stator of an automotive alternator having:

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