JP3744445B2 - Rotating electric machine stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator of a rotating electric machine, and more particularly to a stator of a rotating electric machine suitable for a synchronous machine.
[0002]
[Prior art]
As shown in FIG. 14, a stator of a rotating electric machine such as a synchronous machine is generally a stator core having tooth portions 3a arranged side by side in the circumferential direction and slots 3 existing therebetween. 2, an insulating slot liner 3 b (hereinafter referred to as a slot liner) is mounted in the slot 3, and a coil 4 that has been previously wound is inserted into the slot 3. It is made by wearing. FIG. 15 shows the inside of the slot 3 in section. On the other hand, the stator coil 4 has a shape as shown in FIG. 16, and a winding frame (not shown) having a shape substantially similar to this shape is made in advance, and the coil 4 is wound around the winding frame a predetermined number of times. It was made by doing. The stator coil 4 was inserted into the slot from the opening 3d of the slot 3 by manual work or a mechanical device. Conventionally, in order to reinforce the electrical insulation of the stator, a varnish insulation treatment in which the stator is impregnated with a polyester or epoxy varnish and heat-dried after coil insertion is completed and predetermined connection is completed. I was going.
[0003]
[Problems to be solved by the invention]
In the above prior art, it cannot be said that sufficient consideration has been given to shortening the length of the coil end portion, and there has been a problem in further downsizing the rotating electrical machine. The problem that the length of the coil end portion in the prior art becomes long will be described in detail as follows. The stator coil 4 has a predetermined slot stride (hereinafter referred to as straddle) determined by the number of poles of the stator, and the length of the coil end is governed by the stride size. In general, when the number of poles is large, the coil straddling is small, so that the length of the coil end is shorter than that of the pole having a small number. Moreover, it can shorten to some extent by devising the shape of the coil end part of the winding frame used when winding a coil. However, if the coil end is significantly shortened, the coil end of the coil to be inserted interferes with the coil end of the inserted coil, and the coil cannot be inserted. Therefore, there is a method for shortening the coil end by forcing the coil end in the axial direction and the radial direction by using external force after the coil insertion is completed after the coil insertion is completed, with the length that does not interfere with coil insertion. It was used. According to this method, in order to form the coil end with a large mechanical force, not only does the slot liner or the coil-coated enamel insulation be damaged, and the pressure resistance of the stator does not occur, but there is a limit to the shortened length even when forced forming. there were.
[0004]
The present invention has been made in view of the above points, and an object thereof is to provide a stator of a rotating electrical machine in which the length of a coil end portion of a stator coil is shortened.
[0005]
[Means for Solving the Problems]
A feature of the present invention is that it includes a stator core having a plurality of teeth and a plurality of slots formed between the teeth, and a stator coil mounted on the stator core. A plurality of coils wound a predetermined number of times, each of the plurality of coils being mounted in adjacent slots across the tooth portion and a plurality of formed coils having open end portions. A plurality of molded coils having a coil group and a plurality of molded coils having open ends, and a second coil group connected in series with the first coil group, and a plurality of molded coils constituting the first coil group; The plurality of formed coils constituting the second coil group are inserted into adjacent slots, one from one end side of the stator core and the other from the other end side of the stator core, and the radial direction of the adjacent slots. Are stacked alternately Each of the plurality of molded coils constituting the first coil group and the plurality of molded coils constituting the second coil group is a first molded coil that is alternately bent in a direction in which the tip end portion of the opening end portion surrounds the tooth portion, The second molded coil to which the tip of the first molded coil is connected to the tip of the open end is alternately arranged in the radial direction of the adjacent slots, and one side of the tip of the second molded coil is the next layer. It is connected in series to one side of the tip of the first molded coil by connecting the other side of the tip of the first molded coil to the other side of the tip of the second molded coil of the next layer. There is. According to the present invention configured as described above, the coil can be formed so as to make a predetermined number of turns as a closed circuit, and the connecting portion between the tip of the first molded coil and the tip of the second molded coil In the state where the coils are stacked, the tip of the first molded coil is maintained so that the insulating property of the first molded coil and the tip of the second molded coil can be reliably joined with each other. A space corresponding to the thickness of the coil plate can be secured in the radial direction of the slot with respect to each of the connecting portions between the portion and the tip of the second molded coil .
[0006]
Further, the present invention can provide a stator which reliably shortened coil end length by the above configuration. Moreover, according to the present invention , sufficient electrical insulation performance can be obtained by shortening the coil end length.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a stator of a rotating electrical machine according to the present invention will be described in detail with reference to the illustrated embodiments.
[0008]
FIG. 1 is a front view of a stator 1 showing a state in which a stator coil 4 is inserted into a slot 3 of a stator core 2 in an embodiment of a stator of a rotating electrical machine according to the present invention. FIG. 2 is a side view of the stator 1, and FIG. 3 is a partial front view of the stator 1 as seen from the inner diameter side. The stator 1 is provided on the stator core 2 and the stator core 2. A state where a predetermined number of stator coils 4 are inserted into the plurality of slots 3 is shown. The stator coil 4 is formed by separating only one radial portion of the four sides formed by using a rectangular wire coil, and forming the remaining three sides in a U shape. The coil 4 is inserted into the slot 3 from one end of the stator core 2 with a radial gap 45 corresponding to the coil plate thickness provided between the coils.
[0009]
Next, as shown in FIG. 4, the remaining half or approximately half of the coils 44 are inserted from the other end of the stator core 2 into the radial gap 45 provided in advance in the slot 3. Next, the anti-U-shaped opening ends 4a and 4b and 44a and 44b of the inserted plurality of coils are bent and formed as shown in FIG. The purpose of this bending is to make it easy to connect the connecting portions when the individual coils are connected so that the coils have a predetermined number of turns of the closed circuit.
[0010]
Next, the connection between the coils will be described in detail with reference to FIG.
[0011]
FIG. 6 is a side view illustrating an example of the stator according to the embodiment. The connection between the coils is performed as follows.
[0012]
First, among a plurality of coils inserted into the slot 3, one half of the stator core, that is, about half of the coils inserted from the upper side in FIG. 7 is connected on the upper side, and the other end side of the stator core, that is, the lower side in FIG. The remaining half of the coils inserted from the above are connected on the lower side.
[0013]
Now, of the plurality of coils inserted from the upper part of the stator core shown in FIG. 7, assuming that the tip of the coil 41 as the entrance is 41a, the other end of the coil 41 is indicated by 41b. The tip 41b is connected to the tip 42a of the coil 42 inserted in the upper layer of the coil 41.
[0014]
And the other end 42b of the coil 42 is connected with the front-end | tip 43a of the coil 43 inserted in a further upper layer. Further, the connection is repeated in this order for the coil inserted in the upper layer.
[0015]
Here, the coil inserted into the upper layer of the coil refers to a coil inserted from one side of the stator core. In other words, the coil inserted from the other side of the stator core is located immediately above the coil, but the coil is located above the coil. On the other hand, about half of the coils inserted from the other end are connected in the same manner as described above.
[0016]
In the connection so far, it has been completed to connect a plurality of coils inserted from one side of the stator core in series, but a predetermined number of turns has not yet been formed.
[0017]
Therefore, as shown in FIG. 8, about half of the coil group entrance 41 a inserted from the upper part of the stator core 2 shown in FIG. 8 using the crossover 5 and the remaining half of the coil inserted from the lower part of the stator core 2. The group outlets 46b are connected in series. Thus, a predetermined number of turns can be formed. For example, TIG welding is preferably used for connection.
[0018]
Although the connection location has been described here, in the molding performed before the connection process, the coil end portion is molded as shown in FIG. 11 so as to facilitate the above connection. In addition, the side view of the stator which showed the connection location 6 in FIG. 10 is shown.
[0019]
FIG. 12 shows a side view of the stator completed so far. Finally, an embodiment for achieving a desired connection will be described with reference to FIG. The connecting wire 7 is formed from the same material as the coil material. For example, in the case of a three-phase Y connection, the connecting wire 7 is arranged and connected to form a neutral point with the U phase, the V phase, and the W phase.
[0020]
After being configured in this manner, the stator 1 is formed by applying electrical insulation through a varnish treatment process (not shown).
[0021]
A feature of one embodiment according to the present invention is that the stator coil is inserted alternately from both end face directions of the stator core so that the locations where the coils are connected are in the slot and the coil plate thickness is in the stator core radial direction. Can be separated considerably. For this reason, when TIG welding is performed, a sufficient gap is maintained, so that there is no short circuit by welding spatter or welding of parts that should not be welded. Therefore, a highly reliable connection is possible in the connection between the coils.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a stator of a rotating electrical machine in which the length of the coil end portion of the stator coil is significantly shortened.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a stator of a rotating electrical machine according to the present invention.
FIG. 2 is a side view for explaining an embodiment of a stator according to the present invention.
FIG. 3 is an explanatory diagram for explaining an embodiment of a stator coil according to the present invention.
FIG. 4 is a side view for explaining an embodiment of a stator according to the present invention.
FIG. 5 is an explanatory diagram for explaining an embodiment of a stator coil according to the present invention.
FIG. 6 is an explanatory diagram for explaining an embodiment of a stator according to the present invention.
FIG. 7 is an explanatory diagram for explaining an embodiment of a stator coil according to the present invention.
FIG. 8 is a side view for explaining an embodiment of a stator according to the present invention.
FIG. 9 is an explanatory diagram for explaining an embodiment of a stator coil according to the present invention.
FIG. 10 is an explanatory diagram for explaining an embodiment of a stator according to the present invention.
FIG. 11 is an explanatory diagram for explaining an embodiment of a stator coil according to the present invention.
FIG. 12 is a side view for explaining one embodiment of a crossover wire in the slot of the stator according to the present invention.
FIG. 13 is a side view for explaining an embodiment of the stator slot extension wire according to the present invention.
FIG. 14 is an explanatory diagram for explaining a conventional stator.
FIG. 15 is an explanatory diagram for explaining a conventional stator.
FIG. 16 is an explanatory diagram for explaining a conventional stator coil;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Stator iron core, 3 ... Slot, 3a ... Stator core tooth part, 3b ... Slot liner, 3c ... Wedge, 3d ... Opening, 4 ... Stator coil, 5 ... Slot crossover wire, 6 ... Connection location, 7 ... Slot crossover wire, 41 to 44, 46 ... Coil, 45 ... Radial gap.

Claims (5)

A stator core having a plurality of teeth and a plurality of slots formed between the teeth;
A stator coil mounted on the stator core;
The stator coil constitutes a plurality of coils wound a predetermined number of times,
Each of the plurality of coils is
Attached to adjacent slots across the teeth,
And the 1st coil group comprised from the some shaping | molding coil which has an opening edge part,
A plurality of formed coils having an open end, and a second coil group connected in series with the first coil group,
One of the plurality of molded coils constituting the first coil group and the plurality of molded coils constituting the second coil group is one end side of the stator core, and the other is the other end side of the stator core. Are inserted into the adjacent slots respectively, and are stacked alternately in the radial direction of the adjacent slots,
Each of the plurality of molded coils constituting the first coil group and the plurality of molded coils constituting the second coil group is first bent in such a manner that the tip end portion of the opening end portion is alternately bent in a direction surrounding the tooth portion. Molded coils and second molded coils having tip ends of the first molded coils connected to tip ends of the opening end portions are alternately arranged in the radial direction of the adjacent slots, and One side of the tip is connected to one side of the tip of the first molded coil of the next layer, and the other side of the tip of the first molded coil is connected to the other side of the tip of the second molded coil of the next layer. The stator of the rotating electrical machine is connected in series . The stator of the rotating electrical machine according to claim 1,
The molded coil is
The coil is formed in a U shape,
A stator for a rotating electrical machine, wherein the two straight sides are stepped in the coil plane direction so as to be shifted by one coil. The stator of the rotating electrical machine according to claim 1,
The stator of the rotating electrical machine, wherein the formed coil has a coil width that increases from the opening side of the slot toward the bottom. The stator of the rotating electrical machine according to claim 1,
The stator of a rotating electrical machine, wherein the slot is skewed in the axial direction. Have a stator,
The stator is
A stator core having a plurality of teeth and a plurality of slots formed between the teeth;
A stator coil mounted on the stator core;
The stator coil constitutes a plurality of coils wound a predetermined number of times,
Each of the plurality of coils is
Attached to adjacent slots across the teeth,
And the 1st coil group comprised from the some shaping | molding coil which has an opening edge part,
A plurality of formed coils having an open end, and a second coil group connected in series with the first coil group,
One of the plurality of molded coils constituting the first coil group and the plurality of molded coils constituting the second coil group is one end side of the stator core, and the other is the other end side of the stator core. Are inserted into the adjacent slots respectively, and are stacked alternately in the radial direction of the adjacent slots,
Each of the plurality of molded coils constituting the first coil group and the plurality of molded coils constituting the second coil group is first bent in such a manner that the tip end portion of the opening end portion is alternately bent in a direction surrounding the tooth portion. Molded coils and second molded coils having tip ends of the first molded coils connected to tip ends of the opening end portions are alternately arranged in the radial direction of the adjacent slots, and One side of the tip is connected to one side of the tip of the first molded coil of the next layer, and the other side of the tip of the first molded coil is connected to the other side of the tip of the second molded coil of the next layer. Thus, the rotating electrical machine is connected in series.

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