JP2008079485A - Stator in dynamo-electric machine and manufacturing method of same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator in a dynamo-electric machine for improving a space factor of a coil at a coil end, eliminating a flaw on the coil, preventing slot cells from being buckled, and easily inserting the coil, and its manufacturing method. <P>SOLUTION: A first annular iron core 2 and a second iron core 3 having the same shape are stacked and disposed. The first and second slot cells 6a, 6b are stacked, and inserted into a slot 9 in the iron cores. After the coil 5 is inserted into the slot cells, a gap between the first and second iron cores 2, 3 is fully extended within the coil 5. Since the first and second stacked slot cells 6a, 6b are slid and the total length is extended in response to the sum of lengths of the first and second iron cores 2, 3 mutually separated, the coil is not prevented from being inserted, and is surely protected after an insertion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator that can perform a work of mounting a coil in a slot of a stator of a rotating electrical machine very easily and can improve a coil space factor of a coil end portion, and a method for manufacturing the same. is there.

In a stator of a rotating electric machine having an exciting coil, the coil is generally embedded in a slot of a stator core (hereinafter referred to as a core), but the coil is wound across several stator magnetic poles (actually Since it is necessary to form the coil by winding it in a large space with a margin in another place, and then inserting this into the slot), there is a margin of the coil at the end of the core (the end on the axial direction side of the rotating electrical machine). The seen part protrudes from the end of the core, and the protruded coils are piled up steadily to occupy useless space.
This protruding part of the coil end is a part that does not contribute to strengthening the magnetic field created by the stator of the exciting coil, that is, a part that does not contribute to the improvement in performance. In order to improve the performance of rotating electrical machines, it is necessary to reduce the volume of the part or, on the contrary, to increase the volume of the core inserted inside the coil (hereinafter referred to as the coil space factor) if the same coil size is used. It has been.

  A split core method is used as one of the methods for increasing the coil space factor of a rotating electrical machine. For example, in Patent Document 1, in order to increase the coil space factor of the portion where the coil protrudes from the thickness of the iron core (coil end portion), after the coil is mounted on an integral core, A core structure in which a small or thin core is assembled (inserted) into the gap at the core end to increase the volume of the core end and increase the coil space factor of the coil end is disclosed. Yes. The integrated core to which the coil is first attached is formed by laminating magnetic plates in which all the stators of one rotating electrical machine are magnetically coupled, whereas the space at the end of the coil is later The core to be inserted into the core (referred to as a split core to distinguish it from the first core) is appropriately formed in an arbitrary shape in accordance with the shape of the coil space. However, in this structure, the split core inserted later is pushed into a slight gap between the coil and the first core, and when the split core is inserted while rubbing the coil, there is a high possibility of damaging the coil.

  In Patent Document 2, after the coil is inserted into two of the cores divided into three in the axial direction, the two cores are spread toward both ends of the coil, and another space is spread in the intermediate space. A method in which a split core is inserted later is disclosed. In this case, when the coil is fitted, the two cores are integrated and smaller than the original size, so there is no margin between the coil and the end of the core, even if the coil is not made to a large size with a margin. As a result, the size can be reduced. If you look only at the size of the core, it is true. However, in any rotating machine, the insulating member 1 (slot cell) is inserted into the groove (slot) of the core before inserting the coil in order to eliminate the possibility that the coil directly touches the core and the insulator on the coil surface is peeled off. In general, the insulating member 2 (wedge) is attached to the opening (radial opening) of the slot. Also in patent document 2, it is shown by each figure as the insulating member 4. FIG.

  In Patent Document 2, before insertion of the coil, as shown in FIG. 4A of the same document, it appears that the core is moved to the center and there is a margin at both ends of the coil. However, if the figure is examined in detail, since the insulating member 4 has the final required length from the beginning, in FIG. 4A of the same document, it is long from both ends of the core to both sides (equivalent to the pre-invention of the same document). In addition, there is a problem that the insulating member 4 protrudes and the insertion of the coil is difficult because of this.

JP-A-10-304608 (paragraph [0005] 2nd to 3rd lines, FIG. 1) JP 11-289696 A (paragraph [0011] first and second lines)

A conventional stator of a rotating electric machine has a coil mounted in a state where two of the three divided cores are moved to the center, and after mounting the coil, each of the two cores is moved to the end of the coil and then between them. By inserting the third core, coil mounting is facilitated and the space factor is increased.
However, in the method in which the coil is mounted on two of the three divided cores and the core is moved after the coil is mounted, the size of the core is small at the time of coil mounting, but the slot cell and the wedge mounted in the slot are The length of the coil to be manufactured must be at least the length of the slot cell and the wedge, and the coil cannot be miniaturized. The protruding slot cell is likely to buckle, and there has been a problem that the difficulty in mounting the coil cannot be improved.

  The present invention has been made in order to solve the above-described problems. It improves the coil space factor of the coil end portion, damages the coil, buckles the slot cell, and makes it difficult to insert the coil. It is an object of the present invention to provide a stator for a rotating electrical machine that does not occur and a method for manufacturing the same.

The stator of the rotating electrical machine of the present invention is a first annular iron core having a plurality of teeth on the inner periphery and a plurality of slots formed between the teeth,
A second iron core having the same number of teeth and the same number of slots as the plurality of teeth, and arranged so that the positions of the slots coincide with each other at a predetermined interval in the ring axis direction of the first iron core;
A first slot cell mounted in the slot of the first core, and a first slot cell mounted in the slot of the second core so that a part thereof overlaps the first slot cell; A sliding slot cell composed of a second slot cell that slides between the first slot cell and
A coil mounted in the sliding slot cell;
A third iron core mounted between the first iron core and the second iron core is provided.

A method of manufacturing a stator for a rotating electrical machine according to the present invention includes a step of forming an annular first iron core having a plurality of teeth on an inner periphery and a plurality of slots formed between the teeth.
Forming a second iron core having the same number of teeth and the same number of slots as the plurality of teeth;
A step of arranging the first iron core and the second iron core so as to overlap the positions of the slots;
Mounting the first slot cell and the second slot cell on the first iron core slot and the second iron core slot,
Attaching a coil wound in advance to the first slot cell and the second slot cell;
Separating the first iron core and the second iron core in the axial direction, and simultaneously sliding and extending the second slot cell with respect to the first slot cell;
A yoke divided in the circumferential direction between the first iron core and the second iron core, and a step of inserting a third iron core provided on the yoke and having a protrusion at the tip.

  According to the stator of the rotating electrical machine of the present invention, when the divided core is first reduced near the center, the length of the slot cell is also reduced in accordance with the length of the core. Can be reduced in advance, and the size of the rotating electrical machine can be reduced. In addition, the slot cell does not get in the way when inserting the coil, there is no risk that the slot cell will buckle when the coil hits the slot cell, the coil insertion becomes easy, and the space factor at the end of the coil can be increased. The effect of being able to reduce the size of the rotating electrical machine can be obtained.

Embodiment 1 FIG.
1 is a perspective view showing the structure of a stator 1 (after assembly) of a rotating electrical machine according to Embodiment 1 of the present invention.
FIG. 2 is a side view showing a part of FIG. 1 as a partial cross section in order to help understanding of the structure of FIG.
The stator (also called an iron core assembly) 1 is formed by laminating an annular magnetic plate 99 (silicon steel plate or the like) having a plurality of teeth 8 shown in FIG. 3 and a plurality of slots 9 formed between the teeth 8. The first iron core 2, the second iron core 3 having the same shape (thickness may be different), and the yoke portion 10 shown in FIG. 4 divided in the circumferential direction between the first and second iron cores. It is the iron core structure comprised by the 3rd iron core 4 comprised by inserting several. The magnetic plate 99 of FIG. 3 is formed with a plurality of teeth 8 protruding on the inner peripheral surface with a predetermined interval and provided with a protrusion 20 at the tip. A slot 9 is formed between the magnetic pole teeth 8. The third iron core 4 is formed by laminating a magnetic plate having the shape shown in FIG. 4 having a yoke portion 13 divided into a plurality of portions in the circumferential direction and a tooth 8a connected to the yoke portion 13 and integrating them by a method such as welding or crimping. It is a thing. The yoke portion 13 in FIG. 4 has teeth 8a that do not have a protrusion 20 at the tip, and half portions of slots provided on both sides thereof, and positioning protrusions that make it easier to determine the position of each other during insertion. And a recess.

The first and second iron cores 2 and 3 in FIGS. 1 and 2 have substantially the same laminated thickness in the drawings, but may not have the same thickness. The laminated thickness of the third iron core 4 may be thicker or thinner than the thickness of the first and second iron cores.
FIG. 5 is a side cross-sectional view showing the cross-sectional structure of the stator 1 (after assembly) of the rotating electrical machine in more detail. Unlike the partial cross-sectional view of FIG.
6 is a perspective view showing a detailed structure of the slide type slot cell combination 6 used in FIG. 5, and FIG. 7 is a side sectional view of the slide type slot cell combination 6. As shown in FIG. The sliding slot cell combination 6 may be called a sliding slot cell or simply a slot cell.
FIG. 8 is a side sectional view showing a state when the coil is inserted in FIG.

In FIG. 5, the sliding slot cell combination 6 is fitted inside the slot 9. 6 and 7, the first slot cell 6a is made of a film-like insulating material and has a U-shaped cross section (a shape matching the inner shape of the slot 9). The cross-section inserted into the slot cell 6a is combined with a second slot cell 6b having a U-shape (same as above). The length of the first slot cell 6a is shorter than the sum of the thicknesses of the first and second iron cores, and the length of the second slot cell 6b is less than the sum of the thicknesses of the first and second iron cores. long. By sliding each other, the entire length of the slide type slot cell assembly 6 can be expanded and contracted. The length when extended is longer than the total length of the first, second and third iron cores as shown in FIG.
FIG. 8 is a cross-sectional view showing a state in which the stator is being assembled. FIG. 8 (a) shows the state before the coil 5 is attached, FIG. 8 (b) shows the state after the coil 5 is attached, and FIG. It is a figure showing the state where the 1st and 2nd iron cores 2 and 3 were separated. In FIG. (A), the slide-type slot cell assembly 6 is shown in a state where the first and second iron cores 2 and 3 are integrated into one, and the wedge 7 is on the coil side. It is not inserted into the slot 9 yet. In FIG. 8, unlike FIG. 1, the thickness of the first iron core is different from the thickness of the second iron core. The slide type slot cell combination 6 is shown in a shortened state in (a) and (b), and in an extended state in (c). The length of the sliding slot cell assembly 6 when shortened is the length obtained by adding the locking portions 6c at both ends to the length obtained by adding the thicknesses of the first and second iron cores.

  When the coil 5 is inserted into the slot 9 (actually, it is inserted into the sliding slot cell combination 6), the sliding slot cell combination 6 is inserted into the slot by the friction of the coil 5. The force which tries to pull out from 9 works. However, the second slot cell 6b is combined inside the first slot cell 6a, and the second slot cell overlaps the entire back surface of the first slot cell 6a. Only the second slot cell 6b receives the force to be pulled out. In FIG. 5, the coil 5 is inserted from the bottom to the top, and the second slot cell 6b receives a force that moves upward from the frictional resistance of the coil insertion, but is provided on the end surface of the second slot cell 6b. Movement is prevented by the folded portion 6c (locking portion). That is, the first slot cell 6a and the second slot cell 6b are each provided with a locking portion 6c that is locked to the first iron core 2 or the second iron core 3 at one end thereof.

  8 (a) and 8 (b), the thickness of the iron core when the coil 5 is inserted is a state in which the first iron core 2 and the second iron core 3 are overlapped, which is compared with that when the stator is completed (the state shown in FIG. 1). The thickness of the third iron core 4 is reduced. That is, by shortening the dimension of the slide type slot cell assembly 6, it is possible to suppress the length of the slot cell protruding from the end face of the iron core with the third iron core 4 not inserted. As a result, the coil circumferential length does not need to have a large margin as compared with the case where the length of the slot cell is fixed, and can be shortened accordingly. The wedge 7 of FIG. 8 will be described in detail in the second embodiment, but is mounted in the slot 9 for the purpose of protecting the coil 5 by covering the opening (radial direction) of the slot 9. In the present invention, when the coil 5 is inserted into the slot 9, it is inserted together with the coil 5. Therefore, it is not necessary to expand and contract like the slide type slot cell assembly 6.

As apparent from FIG. 8, the length of the first slot cell 6 a mounted in the slot 9 of the first iron core 2 (more precisely, the length of the slot cell stacked on the outside) is set to the first iron core 2. The length of the second slot cell 6b attached to the slot 9 of the second iron core 3 (more precisely, the length of the slot cell attached inside) is the second iron core. When the first and second iron cores 2 and 3 are separated from each other, the friction of the slot cells is reduced to the first and second slot cells. It is possible to prevent the friction between the iron core and the slot cell, and to prevent the stretched slot cells from separating from each other.
6 and 7, the locking portion 6c is formed by folding back the end of a slot cell made of a film-like insulator. However, this part is for preventing the slot cell from falling by being caught by the first and second iron cores and by the coil 5 coming out of the slot 9. 6c may be formed.
The shape of the slot cell is adapted to the shape inside the slot 9 and is not limited to that shown in FIG.

Embodiment 2. FIG.
FIG. 9 is a perspective view showing the shape of the wedge 7 according to Embodiment 2 of the present invention, and FIG. 10 shows a cross-sectional view taken along line AA of FIG. As described above, the wedge 7 is mounted in the slot 9 for the purpose of covering the opening (radial opening) of the slot 9 and insulating between the coil 5 and the iron core. In the present invention, as shown in FIG. 8 of the first embodiment, when the coil 5 is inserted into the slot 9, it is inserted together with the coil 5. Therefore, it is not necessary to expand and contract like the slot cell 6.
As shown in FIG. 9, the wedge 7 is made of a thin film-like insulating material, and folded portions 7 x are formed at both ends of the wedge 7, and after inserting the coil 5, the first iron core 2 and the second iron core 2 are formed. When the iron core 3 is opened (separated), the folded-back portion 10 is caught on the end portion of the iron core, so that the displacement of the wedge 7 (such as the wedge jumping out of the iron core) can be prevented.
The folded portions 7x shown in FIG. 9 are provided at both ends, but are not necessarily required at both ends. The first core 2 is a direction in which the coil 5 is slid when the coil 5 is inserted or the iron core that moves relative to the coil 5 after the coil is inserted. When the second iron core 3 is determined, it may be provided at least on the side where the iron core moving relative to the coil exists. Further, similarly to the slide type slot cell 6 of the first embodiment, the folded portion 7x may be formed by adhesion or molding, in addition to being bent. The wedge 7 in FIG. 9 shows a U-shape, but the folded portion of the U-shape may be adapted to the shape inside the slot 9 even if it is not clear as shown in the figure. It ’s fine.

Embodiment 3 FIG.
As shown in FIG. 4 of the first embodiment, the tip of the tooth 8a of the third iron core 4 does not have the protrusion 20 provided at the tip of the tooth 8 of FIG. The protrusions 20 are for reducing the magnetic resistance between the opposing rotors and increasing the efficiency of the rotating electrical machine. However, the third iron core 4 has a gap between the coils (actually after the coil is inserted). Is not provided with a projection 20 at the tip, because it must be attached so as to be inserted into the gap of the slot cell 6. Therefore, there is a problem that the efficiency is reduced accordingly.
FIG. 11 is a diagram showing a third iron core 4x according to the third embodiment of the present invention. FIG. 12 is a view showing the shape of the tip of the tooth 8x with protrusions before the third iron core 4x is attached to the stator 1. FIG. FIG. 13 is an explanatory view showing a state in which the shape of the tip of the tooth 8x with protrusions is changed after the third iron core 4x of FIG.
As shown in FIG. 11, the third iron core 4x is divided for each tooth 8x with protrusions, and when the third iron core 4x is connected, a slot 12 is formed between the teeth 8x with protrusions. The yoke portion 13 of the third iron core 4x is provided with a positioning projection 14 used for connection and a positioning recess 15 corresponding to the adjacent yoke projection 14, as shown in FIG. Assembling is improved by eliminating the protrusions 14 and the recesses 15 only in the yoke portions of the third iron core 4a attached to the iron core 4b and the iron cores 4b on both sides adjacent to the last iron core 4a. The last iron core 4a is fixed by welding or caulking after insertion.

As will be described in detail in the fourth embodiment, the third iron core 4x is mounted after the coil 5 is mounted. That is, after the sliding type slot cell assembly 6, the coil 5 and the wedge 7 are attached to the first and second iron cores, the third core teeth 8x are sequentially inserted into the gaps between the sliding type slot cells 6. It becomes.
As shown in FIG. 12, foldable protrusions 16 are provided on both sides of the tip of the protruding tooth 8 x of the third iron core 4 x. Prior to mounting the third iron core 4x, the protrusion 16 is folded inward as shown in FIG. In this state, the width of the portion of the teeth with protrusions 8x is smaller than the maximum width of the teeth with protrusions 8x, so that there is no obstacle when inserting the teeth with protrusions 8x.
Then, after all the third iron cores 4x are mounted and fixed to each other, the two protrusions 16 are bent outwardly to form tooth tip shapes that are substantially the same shape as the first iron core 2 and the second iron core 3, respectively. The bent protrusion 16 is apparently wide at the tip of the tooth 8x, and the induced voltage can be increased by reducing the magnetic resistance between the opposing rotors.

Embodiment 4 FIG.
The procedure for assembling the rotating electrical machine according to the first to third embodiments will be described with reference to the flowchart of FIG. (Step S1) The magnetic plates 99 punched from the silicon steel plate are laminated to make the first and second iron cores 2 and 3. (Step S2) The first iron core 2 and the second iron core 3 are overlapped, and the slide-type slot cell combination 6 shown in FIG.
(Step S3) The coil 5 wound in advance is inserted into the slot 9 of the first iron core 2 and the second iron core 3, as shown in FIG. To do. At this time, the wedge 7 is arranged at a position to close the opening of the slot 9.
(Step S4) The stacked first iron core 2 and second iron core 3 are opened (separated) up and down and moved to the coil end portions (both ends) of the coil 5 as shown in FIG. At this time, the first slot cell 6 a of the sliding slot cell 6 moves with the first iron core 2, and the second slot cell 6 b moves with the second iron core 3. That is, the second slot cell 6b slides in the first slot cell 6a, and the length of the slide type slot cell 6 is increased.
(Step S5) The protruding teeth 8x of the third iron core 4x are sequentially inserted into the space formed between the first iron core 2 and the second iron core 3.
(Step S6) After fixing a necessary portion of the third iron core 4x by caulking or welding, the protrusion 16 at the tip of the tooth with protrusion 8x is opened.

  The stator of the rotating electrical machine according to the present invention is not limited to the rotating electrical machine, but can be applied to any transformer, relay, solenoid, and the like that winds the core.

1 is a perspective view showing a stator of a rotating electrical machine according to Embodiment 1 of the present invention. It is a side view which shows the partial cross section of the stator of the rotary electric machine of FIG. It is a figure which shows the shape of the 1st, 2nd iron core of the stator of FIG. It is a figure which shows the shape of the 3rd iron core of the stator of FIG. FIG. 2 is a full sectional view of FIG. 1. It is a block diagram of the slide-type slot cell combination shown in FIG. FIG. 7 is a cross-sectional view of the sliding slot cell combination of FIG. 6. It is sectional drawing in the middle of the assembly of the stator of FIG. It is a perspective view of the wedge used for the stator of the rotary electric machine of Embodiment 2 of this invention. FIG. 10 is a cross-sectional view of the wedge of FIG. 9. It is a figure which shows the shape of the 3rd iron core of the stator of the rotary electric machine of Embodiment 3 of this invention. FIG. 11 is a detailed view of a magnetic tooth portion of FIG. 10. It is a figure which shows the deformation | transformation state of the magnetic pole tooth part of FIG. It is a flowchart explaining the assembly procedure of the rotary electric machine of Embodiment 1- Embodiment 3. FIG.

Explanation of symbols

1 stator, 2 first iron core, 3 second iron core,
4 third iron core, 5 coil, 6 sliding slot cell assembly,
6a first slot cell, 6b second slot cell, 6c locking part,
7 wedge, 7x folded part, 8 teeth, 8x teeth with protrusions,
9 slots, 13 yokes, 14 positioning protrusions,
15 positioning recess, 16 protrusion, 99 magnetic plate.

Claims (9)

An annular first iron core having a plurality of teeth and a plurality of slots formed between the teeth on the inner periphery,
A second iron core having the same number of teeth and the same number of slots as the plurality of teeth, and being arranged at predetermined intervals in the axial direction so that the positions of the slots and the slots of the first iron core coincide with each other;
A first slot cell mounted in the slot of the first core, and a first slot cell mounted in the slot of the second core so that a part thereof overlaps the first slot cell; A sliding slot cell composed of a second slot cell that slides between the first slot cell and
A coil mounted in the sliding slot cell;
A stator for a rotating electrical machine, comprising a third iron core mounted between the first iron core and the second iron core.   The second slot cell is disposed so as to overlap the inside of the first slot cell, the length of the first slot cell is substantially the same as the thickness of the first iron core, The stator of the rotating electrical machine according to claim 1, wherein the length is longer than the sum of the thickness of the second iron core and the thickness of the third iron core.   The stator of a rotating electrical machine according to claim 1, wherein the third iron core includes a tooth with a protrusion having a protrusion that can be bent at a tip. The length of the first slot cell is shorter than the sum of the thicknesses of the first and second iron cores,
The length of the second slot cell is longer than the sum of the thicknesses of the first and second iron cores,
The sum of the length of the first slot cell and the length of the second slot cell is larger than the sum of the thicknesses of the first, second, and third iron cores. Stator for rotating electric machine.   The first slot cell and the second slot cell each include a locking portion locked to the first iron core or the second iron core at one end thereof. The stator of the described rotating electrical machine.   6. The rotating electrical machine according to claim 5, wherein the first slot cell and the second slot cell are formed of a film-like insulating material, and the system stop is formed by folding back one end of the film. Stator.   The stator of the rotating electrical machine according to claim 1, further comprising a wedge that is attached to an opening on a radial side of the slot and is folded at least at one end. Forming an annular first iron core having a plurality of teeth and a plurality of slots formed between the teeth on the inner periphery;
Forming a second iron core having the same number of teeth and the same number of slots as the plurality of teeth;
A step of arranging the first iron core and the second iron core so as to overlap the positions of the slots;
Mounting the first slot cell and the second slot cell on the first iron core slot and the second iron core slot,
Attaching a pre-wound coil inside the first slot cell and the second slot cell;
Separating the first iron core and the second iron core in the axial direction, and simultaneously sliding and extending the second slot cell with respect to the first slot cell;
Including a yoke portion divided in the circumferential direction between the first iron core and the second iron core, and a third iron core having a tooth portion provided on the yoke and having a protrusion at the tip. A method of manufacturing a stator of a rotating electric machine, characterized in that   The method for manufacturing a stator of a rotating electric machine according to claim 8, further comprising a step of bending a protrusion at a tip of a tooth portion of the inserted third iron core.

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