JP2001016812A - Stator for dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a small-sized dynamo-electric machine. SOLUTION: Stator coils 24 are inserted into the stator slots of a stator core 22. An axial length L4 of oblique side parts 24B of inserted-side end coils, among stator coils which form insertion-side and inserted-side end coil parts protruding from both end parts of the stator core 22, is made shorter than an axial length L3 of the oblique side parts 24A of the insertion-side end coils.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotating electric machine, and more particularly to a stator for a rotating electric machine suitable for downsizing an induction motor or a synchronous machine.

[0002]

2. Description of the Related Art The stator of a rotating electric machine such as an induction motor is
Generally, a stator coil is inserted into a stator slot so that a stator coil is wound around a stator salient pole formed on a stacked stator core. From the end of the stator core, the stator coil has a coil end projecting therefrom. The total length of the stator is determined by the axial length of the stator core and the length of the coil end at both ends. .

In order to insert a stator coil into a slot formed in a stator core, a coil insertion device is generally used. After inserting the stator coil at the tip of the blade of the coil insertion device and inserting this blade into the cylindrical opening at the center of the stator core, insert a stripper having an outer diameter approximately equal to the inner diameter of the opening of the stator core. By doing so, the stator coil is inserted into the stator slot.

[0004]

Here, coils of three phases of U-phase, V-phase and W-phase are sequentially inserted into the stator coil. For example, after the U-phase coil is inserted first, When trying to insert a V-phase coil, the already inserted U-phase coil interferes with the V-phase coil to be inserted, thereby hindering the insertion. Further, if an attempt is made to insert the W-phase coil after the U-phase coil and the V-phase coil are inserted, interference with the inserted U-phase coil and V-phase coil is further increased, which hinders the insertion. Therefore, in the conventional stator of the rotating electric machine, the coil end portion has a desired overall length, and there is a problem that it is difficult to reduce the size of the stator of the rotating electric machine.

An object of the present invention is to provide a small-sized stator for a rotating electric machine.

[0006]

(1) In order to achieve the above object, the present invention provides a stator core having a stator slot, and a stator core inserted into the stator slot of the stator core. A stator coil wound around the formed stator salient poles, the stator coil forming an insertion-side and insertion-side end coil portion projecting from both ends of the stator core. Of these, the axial length of the oblique side of the inserted end coil is shorter than the axial length of the oblique side of the inserted end coil. With this configuration, the interference of the inserted stator coil on the insertion side is reduced, and even when the total length of the stator coil is shortened, the stator coil can be easily inserted. Since the insertion is possible, the stator of the rotating electric machine can be reduced in size.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a stator of a rotating electric machine according to an embodiment of the present invention will be described below with reference to FIGS. First, an overall configuration of a rotating electric machine using a stator of the rotating electric machine according to one embodiment of the present invention will be described with reference to FIG. FIG. 1 is a partial sectional view of a rotating electric machine using a stator of the rotating electric machine according to one embodiment of the present invention as viewed from the front side.

In FIG. 1, a stator 20 of a rotating electric machine 10 is shown.
Is composed of a stator core 22 and a multi-phase stator coil 24 wound around the stator core 22. The stator coil 24 is inserted into a slot formed in the stator core 22 as described later,
It is wound around salient poles. The stator 20 includes the housing 4
0 is fixedly held on the inner peripheral surface. The rotor 30 includes a rotor core 32, a permanent magnet 36 inserted in a permanent magnet insertion hole 34 provided in the rotor core 32, and a shaft 38. The shaft 38 has a bearing 4
2 and 44 rotatably held. The bearings 42 and 44 are supported by end brackets 46 and 48, and the end brackets 46 and 48 are fixed to both ends of the housing 26, respectively.

Further, a magnetic pole position detector PS for detecting the position of the permanent magnet 36 of the rotor 30 and an encoder E for detecting the position of the rotor 30 are arranged on the side of the rotor 30. The operation of the rotating electric machine 10 is controlled by a control device described later based on a signal of the magnetic pole position detector PS and an output signal of the encoder E.

Next, the external configuration of the stator coil 24 used in the stator of the rotating electric machine according to the present embodiment will be described with reference to FIG. FIG. 2 is a plan view showing an external configuration of a stator coil used for the stator of the rotating electric machine according to one embodiment of the present invention.

The stator coil 24 has a hexagonal shape as shown in the figure. The stator coil 24 has an insertion side coil end oblique side portion 24A, an inserted side coil end oblique side portion 24B, and a straight portion 24C wound by a predetermined number of turns.
And The stator coil 24 is formed by winding a predetermined number of turns of a coil around a coil-winding mold so as to have a shape as shown in FIG.

Here, the stator coil 24 is inserted into a slot of the stator core by using a coil insertion device described later with reference to FIG. The side coil end oblique side 24A, and the side to be inserted last is the inserted side coil end oblique side 24B.

A feature of this embodiment is that the axial length L1 of the insertion-side coil end oblique side 24B is shorter than the axial length L2 of the insertion-side coil end oblique side 24A. is there. Note that, in the conventional stator coil, the axial lengths of the coil end oblique sides on the insertion side and the insertion side are equal.

Next, the insertion state of the stator coil into the stator core in the stator of the rotating electric machine according to the present embodiment will be described with reference to FIG. FIG. 3 shows a state in which the stator core 22 is unfolded in the circumferential direction with respect to one center coil of the stator coil 24 inserted into the stator core 22. In the figure, the Z direction is the axial direction of the stator core 22, and the R direction indicates the circumferential direction of the stator core 22. For comparison with the conventional configuration,
The insertion state of the conventional fixed coil 24 'is shown by a broken line.

As described with reference to FIG. 2, in this embodiment, the axial length L1 of the insertion-side coil end oblique portion 24B is shorter than the axial length L2 of the insertion-side coil end oblique portion 24A. That is. On the other hand, in the conventional stator coil 24 ', the axial length LP2 of the insertion side coil end oblique side 24A' is equal to the axial length LP1 of the insertion side coil end oblique side 24B '.

The axial length of the straight portion 24C of the stator coil 24 is longer than the axial length L10 of the stator core 22. Therefore, on the insertion side, the insertion-side coil end linear portion 24C1 protrudes from the stator core 22, and forms a part of the insertion-side coil end portion. Here, assuming that the axial length of the insertion-side coil end linear portion 24C1 is L3, the axial length of the insertion-side coil end portion is:
L5 (= L2 + L3).

On the insertion side, the insertion-side coil end linear portion 24C2 projects from the stator core 22, and forms a part of the insertion-side coil end portion. Here, assuming that the axial length of the inserted-side coil end linear portion 24C2 is L4, the axial length of the inserted-side coil end portion is L6 (= L1 + L4).

Accordingly, the total length (axial length) L7 of the stator
Is obtained by adding the axial lengths L5 and L6 of the insertion-side and insertion-side coil end portions to the axial length L10 of the stator core 22.

Here, a specific axial length will be described. For example, the axial length L10 of the stator core 22 is set to 1
When the length is set to 50 mm, in the stator using the conventional stator coil 24 ′, the axial length LP5 of the insertion-side coil end is 30 mm, and the axial length LP6 of the insertion-side coil end is 30 mm. Therefore, the total length (axial length) LP7 of the stator is 210 mm. Here, the axial length LP2 of the insertion side coil end oblique side portion 24A 'is 20 mm, and the insertion side coil end straight portion 24C1'.
Has an axial length LP3 of 10 mm. The axial length LP1 of the insertion-side coil end oblique side portion 24B 'is 20.
mm, and the axial length LP4 of the insertion-side coil end linear portion 24C2 'is 10 mm.

On the other hand, the stator coil 24 according to this embodiment
, The axial length L5 of the insertion-side coil end portion is 25 mm and the axial length L6 of the insertion-side coil end portion is 25 mm, so that the entire length of the stator (axial length ) L7 is 200 mm. Here, the axial length L2 of the insertion side coil end oblique side portion 24A is 20
mm, and the axial length L3 of the insertion-side coil end linear portion 24C1 is 5 mm. The axial length L1 of the insertion-side coil end oblique side portion 24B is 10 mm, and the axial length L4 of the insertion-side coil end linear portion 24C2 is 15 mm. That is, in the present embodiment, the overall length L7 of the stator can be reduced by 10 mm as compared with the conventional overall length LP7. Further, the axial length L5 of the insertion-side coil end portion and the axial length L5 of the insertion-side coil end portion
It is equal to 6.

Here, the insertion-side coil end will be described. The axial length L2 of the insertion side coil end oblique side portion 24A according to the present embodiment is equal to the axial length LP2 of the conventional insertion side coil end oblique side portion 24A '.
The insertion-side coil end oblique side is a side to be inserted using a coil insertion device, as described later. When inserting a stator coil using a coil insertion device, the insertion side of the stator coil needs to be inserted into the blade of the coil insertion device, and the necessary portion is inserted on the insertion side coil end oblique side. 24A. If the length of the portion necessary for the insertion is shortened, it becomes impossible to sufficiently insert the blade into the coil insertion device.
The axial length L2 of the insertion side coil end oblique side portion 24A is:
It is equal to the axial length LP2 of the conventional insertion side coil end oblique side portion 24A '. However, the axial length L of the insertion-side coil end straight portion 24C1 according to the present embodiment is not limited to this.
Reference numeral 3 is shorter than the conventional length LP3 of the insertion-side coil end linear portion 24C1 '. This is to facilitate insertion of the insertion-side coil end portion in spite of the fact that the lengths L5 and L6 of the coil end portions are shorter than in the related art, as described later.

Next, the coil end on the insertion side will be described. The axial length L1 of the inserted side coil end oblique side portion 24B according to the present embodiment is shorter than the axial length LP1 of the conventional inserted side coil end oblique side portion 24B '.

The oblique side of the inserted coil end is a portion that is pulled by the blade when the stator coil is inserted using the coil insertion device. The stator coil pulled by the coil insertion device into the opening of the stator core is pushed into the slot of the stator core by the stripper of the coil insertion device. At this time, the insertion side of the stator coil is the most difficult to insert because the stator coil of another phase inserted before it interferes.

Here, as will be understood from a comparison between the stator coil end portion according to the present embodiment and the conventional stator coil end portion on the insertion side, in the present embodiment, the shaft of the insertion-side coil end portion will be described. Although the axial length L6 is shorter than the conventional axial length LP6 of the insertion-side coil end portion, the axial length L1 of the insertion-side coil end oblique side portion 24B according to the present embodiment is , Conventional axial length LP of the insertion-side coil end oblique side portion 24B '
As a result, the length L in the axial direction of the inserted-side coil end linear portion 24C2 according to the present embodiment is consequently reduced.
No. 4, the axial length of the conventional insertion-side coil end linear portion 24C2 'can be made longer than LP4. As a result, in the present embodiment, the space SP is increased on the side close to the slot where the coil is inserted (the side of the stator coil end linear portion 24C2) by the amount indicated by hatching in the figure. Interference caused by the inserted coil when the coil is inserted is caused by the narrowness of the space, and thus can be increased by the space SP. Therefore, the insertion using the coil insertion device becomes easier than before.

Here, the ease of inserting the stator coil into the stator of the rotating electric machine according to the present embodiment will be described with reference to FIG. FIG. 4A shows the insertion state of the stator coil according to the present embodiment, and FIG.
Fig. 3 shows a state of insertion of a stator coil according to a conventional method.

As shown in FIG. 4A, the stator core 22
After inserting the U-phase stator coil 24U into the stator slot 22B formed in the
When V is inserted, in the present embodiment, the space SP shown in FIG. 3 is present as a gap indicated by hatching in the figure, so that the V-phase stator coil 24V
It will be in the pocket of the phase stator coil 24U. Here, the V-phase stator coil 24V is a U-phase stator coil 24V.
Since it can be formed on the same plane (in the radial direction) as U, the V-phase stator coil 24V can be inserted without receiving the position interference of the U-phase fixed coil 24U.

On the other hand, FIG. 4B shows a case where the length LP4 of the insertion-side coil end linear portion 24C 'is shortened in order to shorten the axial length of the stator coil shown by the broken line in FIG. Is illustrated. If the inserted coil end linear portion is shortened, in other words, if the space surrounded by the stator core end and the non-insertion side coil end portion is narrowed, when the coil is inserted into the slot, the vicinity of the linear portion becomes In particular, it is pulled and interference with the adjacent coil becomes strong, and insertion becomes difficult. That is, the V-phase stator coil 24V 'does not fit in the pocket of the U-phase stator coil 24U' and cannot be formed on the same plane, and the V-phase stator coil 24V 'is 'Can not be inserted due to interference.

Next, a method of inserting a stator coil into the stator of the rotating electric machine according to the present embodiment will be described with reference to FIGS. First, the insertion state of the stator coil in the stator of the rotating electric machine according to the present embodiment will be described with reference to FIG. FIG. 5 is a partial cross-sectional view showing a stator coil inserted state in the stator of the rotating electric machine according to one embodiment of the present invention.

The stator core 22 has a plurality of stator salient pole portions 22A arranged side by side in the circumferential direction, and a slot 22B interposed therebetween. Slot 22 is formed from opening 22C between adjacent stator salient pole portions 22A.
After mounting the insulating slot liner 26 in B, the stator coil 24 previously wound and formed therein is inserted therein.
The slot liner 26 insulates the stator coil 24 from the stator salient pole portion 22A and facilitates the insertion of the stator coil 24 when the stator coil 24 is inserted. Furthermore,
When the stator coil 24 is inserted, a preformed wedge 28 is mounted at the position of the opening 22C to prevent the stator coil 24 from jumping out.

Next, a method of inserting a stator coil by the coil insertion device will be described with reference to FIGS.
6 is an explanatory diagram of a method of inserting a stator coil by a coil insertion device, and FIG. 7 is a cross-sectional view taken along a line AB in FIG.
The same reference numerals as those in FIG. 5 indicate the same parts.

The illustrated coil insertion device includes a housing 1
10, a blade 111, a blade holder 112,
It is composed of a stripper 113 for coil insertion, a rod 14, a bolt 115, a wedge guide 16, and a wedge pusher 17.

The housing 110 has a substantially cylindrical shape when viewed from above in FIG. 6, and serves as a base for the entire coil insertion device. A blade 111 is mounted inside the housing 110. The blade 111 is formed by arranging a plurality of upwardly extending rod-shaped members in a circular comb shape, and is attached to a peripheral portion. A wedge guide 116 is provided inside the housing 110 and on the outer peripheral side of the blade 111. Wedge guide 1
Reference numeral 16 denotes a plurality of upwardly-arranged rod-like members arranged in a cylindrical comb shape, and guides the wedge 120. The blade 111 and the wedge guide 116 are attached to the housing 110 by a short cylindrical blade holder 112.

Here, the blade 111 and the wedge guide 116 each have a sectional shape as shown in FIG. 7, and as shown, the wedge guides 116 are combined one by one on the outside of the blade 111 so as to overlap. ing. Further, the blades 111 and the wedge guides 116 have the same number as the stator salient pole portions 22A of the stator core 20, and the inner circumferential surface thereof has the circumferentially opening 22C of the slot 22B.
Are arranged annularly so as to face each of the stator salient pole portions 22A.

The stripper 113 is made of a member having a substantially circular shape when viewed from the upper side in FIG. 6, and a plurality of vertical grooves into which the blade 111 is inserted are formed in the periphery thereof. The stripper 113 is attached to the rod 114 by a bolt 115. Rod 114
Is connected to driving means such as a fluid pressure cylinder (not shown) and moves up and down. By the movement of the rod 114, the stripper 113 also moves up and down, and the stator coil 2
4 is moved along the inner peripheral surface (back surface) of the blade 111 and inserted into the slot 22B.

The wedge pusher 117, like the wedge guide 116, is configured by arranging a plurality of upwardly pointing rod-shaped members in a circular comb shape. The wedge pusher 117 is disposed between the wedge guides 116, and is connected to a driving unit (not shown) such as a hydraulic cylinder. The wedge pusher 117 is driven by this driving means.
It moves up and down together with the stripper 113 and pushes the lower end of the wedge 28 held between the two wedge guides 116 as shown in FIG.
And into the slot 22B.

Next, the stator coil 2
4 will be described. First, stripper 1
13 is moved to the root side of the blade 111, that is, to the retreat position on the lower side of FIG. Next, among the plurality of blades 111 arranged in the circumferential direction, blades 111 corresponding to the two slots into which the stator coil 24 is to be inserted are selected, and the stators wound in advance on these are selected. Cross over and hold the part that will be the coil end of the coil,
The wedge 120 is held between the wedge guides 116 corresponding to the slots.

On the other hand, along with this, the slot liner 2
6 is a stator core 20 mounted in each slot 22B.
Is prepared, and is inserted from above the blades 111 arranged in an annular shape as shown in FIG. At this time, the stator salient pole portions 22A of the stator core 20 face the respective blades 111. Then, when the lower side end surface of the stator core 22 is inserted to a position where it comes into contact with the upper end of the wedge guide 116, the stator core 22 is fixed to this position by a stator core position determining device (not shown).

Next, the rod 114 is moved in the forward direction (upward) by driving means (not shown),
13 is advanced in the ring of the blade 111, and the blade 11
1 is inserted into the slot liner 26 in the slot 22A of the stator core 22,
At the same time, the wedge pusher 1 is also driven by the driving means.
17 is moved, and the wedge 120 held between the wedge guides 116 is inserted into the opening 22C side of the slot 22B inside the slot liner 26.

Next, the insertion result of the stator coil in the stator of the rotating electric machine according to the present embodiment will be described with reference to FIG. The horizontal axis in FIG. 8 shows each phase of the U phase, the V phase, and the W phase, and the vertical axis shows the force (insertion force) of the driving device required when inserting the stator coil of each phase.

The solid line A in FIG. 8 shows the insertion force for each phase when the stator coil 24 according to the present embodiment having the shape shown by the solid line in FIG. 3 is inserted into the stator slot. At this time, the ratio (occupation ratio) of the stator coil 24 in the stator slot 22B is 60%, the axial length of the stator coil end portions at both ends is 25 mm, and the total length of the stator is 200 mm. The insertion force when inserting the U-phase stator coil is 450 kg · f. The insertion force when the V-phase stator coil is inserted is 550 kg · f. The insertion force when the W-phase stator coil is inserted is 650 kg · f.

A broken line C in FIG. 8 shows the insertion force for each phase when the conventional stator coil having the shape shown by the broken line in FIG. 3 is inserted into the stator slot. At this time, the space factor is 60%, the axial length of the stator coil end portions at both ends is 30 mm, and the total length of the stator is 210 mm.
It is. The insertion force when inserting the U-phase stator coil is 400
kg · f. The insertion force when inserting the V-phase stator coil is 500 kg · f. The insertion force when inserting the W-phase stator coil is 600 kg · f.

In the prior art, the insertion force is smaller than in the embodiment. However, in the case where the axial length of the conventional stator coil is simply shortened, even if the insertion force is increased, the stator coil cannot be inserted into the stator slot. Although the insertion force is slightly increased, it can be inserted into the stator slot, and thus the axial length of the stator can be reduced.

Further, a solid line B in FIG. 8 indicates a stator coil 24 according to the present embodiment having the shape shown by the solid line in FIG.
Shows the insertion force for each phase when the is inserted into the stator slot. At this time, the space factor is 70%, the axial length of the stator coil end portions at both ends is 25 mm, and the total length of the stator is 200 mm. The insertion force when inserting the U-phase stator coil is 500 kg · f. The insertion force when inserting the V-phase stator coil is 600 kg · f. The insertion force when inserting the W-phase stator coil is 700 kg
-It is f.

In recent years, there has been a tendency to increase the space factor of the coil in order to reduce the size and increase the efficiency of the rotating electric machine. When the space factor increases, the number of windings of the stator coil inserted into the stator slot increases, which makes insertion difficult. However, in the present embodiment, as shown by the solid line B in FIG. 8, although the insertion force is increased, the space factor is improved to 70%, and even if the axial length of the stator is shortened. Thus, the stator coil can be inserted. Therefore, the space factor can be increased, the efficiency can be improved, and the length of the stator in the axial direction can be shortened, so that the rotating electric machine can be downsized.

In the stator coil according to the present embodiment, the axial length can be reduced, and as described with reference to FIG. 3, the axial length of the insertion-side coil end portion and the axial length of the insertion-side coil end portion. Can be equal.
The axial length of the coil end portion is closely related to the coil end leakage permeance of the leakage reactance due to the stator magnetic flux leakage, and the axial lengths are different on both sides of the coil side end. Since the leakage permeance differs and the leakage reactance changes, the performance of the rotating electric machine may be reduced. However, in the present embodiment, the performance of the rotating electric machine can be improved.

As described above, according to the present embodiment, the size of the stator of the rotating electric machine can be reduced. Further, the space factor of the stator coil inserted into the slot can be increased, and the performance of the rotating electric machine can be improved.

Next, the insertion state of the stator coil into the stator core in the stator of the rotating electric machine according to the second embodiment of the present invention will be described with reference to FIG. FIG. 9 is an explanatory diagram of a state where a stator coil is inserted into a stator core in a stator of a rotating electric machine according to a second embodiment of the present invention.

FIG. 9 shows, in the same manner as FIG. 3, the stator core 22 is developed in the circumferential direction with respect to one coil located at the center among the stator coils 24 inserted into the stator core 22. The state is shown. In the figure, the Z direction is the axial direction of the stator core 22, and the R direction indicates the circumferential direction of the stator core 22. For comparison with the conventional configuration,
The insertion state of the conventional fixed coil 24 'is shown by a broken line.

The axial length L7 of the stator coil 24 according to the present embodiment is the same as the axial length L7 of the fixed coil 24 shown in FIG. 3, and is 200 mm. However, the insertion side coil end straight portion 24C1 shown in FIG.
No, instead, the inserted-side coil end straight portion 24
The axial length L4 'of C2 is 20 mm. That is,
5 m to the right with respect to the stator coil 24 shown in FIG.
The coil insertion position is shifted by m.

As a result of this insertion position, as shown in the figure, on the side near the slot where the coil is inserted (on the side of the stator coil end linear portion 24C2), the space SP 'is shown by the hatching in the figure. Can be increased as compared to the space SP shown in FIG. Therefore, insertion using the coil insertion device is easier than in the configuration shown in FIG.

As described above, according to the present embodiment, the size of the stator of the rotating electric machine can be reduced.

Next, the state of the stator coil inserted into the stator core in the stator of the rotating electric machine according to the third embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 13 is an explanatory diagram of a state where a stator coil is inserted into a stator core in a stator of a rotating electric machine according to a third embodiment of the present invention.

FIG. 10 is a view similar to FIGS. 3 and 9 of the stator coil 24 inserted in the stator core 22. As shown in FIG. In the expanded state. In the figure, the Z direction is the axial direction of the stator core 22, and the R direction is the stator core 2
2 shows the circumferential direction. For comparison with the conventional configuration, the insertion state of the conventional fixed coil 24 'is shown by a broken line.

The axial length L7 'of the stator coil 24 "according to this embodiment is 195 mm, which is 5 mm shorter than the axial length L7 of the fixed coil 24 shown in FIG. 9 does not include the insertion-side coil end linear portion 24C1 shown in Fig. 3 like the stator coil 24 shown in Fig. 9. In addition, on the insertion side, a coil similar to that shown in Fig. 3 is used. The insertion side coil end portion is arranged.

As a result of the insertion position, since the insertion side has the insertion side coil end oblique side 24A, the coil can be inserted by the coil insertion device, and the coil can be inserted on the insertion side. (Close to the stator coil end straight section 24C2)
Since the space SP is provided, the insertion becomes easier than before. In addition, the axial length of the stator coil can be reduced, and the stator can be reduced in size.

As described above, according to the present embodiment, the size of the stator of the rotating electric machine can be reduced.

[0057]

According to the present invention, the size of the stator of the rotating electric machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rotating electric machine using a stator of the rotating electric machine according to one embodiment of the present invention as viewed from the front side.

FIG. 2 is a plan view showing an external configuration of a stator coil used for a stator of the rotating electric machine according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a state in which a stator coil is inserted into a stator core in a stator of a rotating electric machine according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of ease of insertion of a stator coil in a stator of a rotating electric machine according to an embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a stator coil inserted state in the stator of the rotating electric machine according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram of a method of inserting a stator coil by the coil insertion device.

FIG. 7 is a sectional view taken along a line AB in FIG. 6;

FIG. 8 is an explanatory diagram of a result of inserting a stator coil in the stator of the rotating electric machine according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating a state where a stator coil is inserted into a stator core in a stator of a rotating electric machine according to a second embodiment of the present invention.

FIG. 10 is an explanatory diagram illustrating a state where a stator coil is inserted into a stator core in a stator of a rotating electric machine according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rotating electric machine 20 ... Stator 22 ... Stator iron core 22A ... Stator salient pole part 22B ... Slot 22C ... Opening 24 ... Stator coil 24A ... Insertion side coil end oblique side part 24B ... Non-insertion side coil end oblique side part 26 ... slot liner 28 ... wedge 30 ... rotor 110 ... housing 111 ... blade 112 ... blade holder 113 ... stripper 114 ... rod 115 ... bolt 116 ... wedge guide 117 ... wedge pusher 120 ... wedge

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yoshikazu Kadowaki 2520 Oji Takaba, Hitachinaka-shi, Ibaraki Co., Ltd.Automobile Equipment Division, Hitachi, Ltd. (72) Inventor Kenfumi Owada 2520 Odaiba Takaba, Hitachinaka-shi Ibaraki Hitachi, Ltd.Automotive Equipment Division (72) Inventor Hidemitsu Kobayashi 2520, Oji Takaba, Hitachinaka City, Ibaraki Prefecture, Ltd.Hitachi, Ltd.Automotive Equipment Division (72) Inventor Shuichi Hara 4-6-1, Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Izumi Shimizu 4-6-6, Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Toshiaki Ueda 2520 Takada, Hitachinaka-shi, Ibaraki Pref.Hitachi, Ltd. F-term in business division (reference) 5H603 AA09 BB01 BB08 BB0 9 BB12 CA01 CA05 CB03 CB04 CC05 CC07 CC17 CD22 CE01

Claims (1)

[Claims] A rotor having a stator core having a stator slot and a stator coil inserted into a stator slot of the stator core and wound around a stator salient pole formed on the stator core. In the stator of the electric machine, of the stator coils forming the insertion-side and insertion-side end coil portions protruding from both ends of the stator core, the axial length of the oblique side portion of the insertion-side end coil is defined as A stator for a dynamo-electric machine, wherein the length of the coil hypotenuse is shorter than the axial length.