JP3626040B2 - Rotating electric machine stator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine suitable for downsizing an induction motor or a synchronous machine.
[0002]
[Prior art]
In general, a stator of a rotating electrical machine such as an induction motor has a stator coil inserted into a stator slot so that the stator coil is wound around a stator salient pole formed on a laminated stator core. It is configured. The coil end portion of the stator coil protrudes from the end of the stator core, and the total length of the stator is determined by the axial length of the stator core and the length of the coil end portions at both ends. .
[0003]
Generally, a coil insertion device is used to insert a stator coil into a slot formed in the stator core. Insert the stator coil into the tip of the blade of the coil insertion device, insert this blade into the cylindrical opening in the center of the stator core, and then insert a stripper with an outer diameter approximately equal to the inner diameter of the stator core opening. As a result, the stator coil is inserted into the stator slot.
[0004]
[Problems to be solved by the invention]
Here, as for the stator coil, coils for three phases of the U phase, the V phase, and the W phase are sequentially inserted. For example, after inserting the U phase coil first, when trying to insert the V phase coil, The already inserted U-phase coil interferes with the V-phase coil to be inserted, thereby hindering insertion. In addition, if the W-phase coil is to be inserted after the U-phase coil and the V-phase coil are inserted, the interference with the inserted U-phase coil and V-phase coil is further increased, which hinders the insertion. Therefore, in the conventional rotating electrical machine stator, the coil end portion has a desired overall length, and it is difficult to reduce the size of the rotating electrical machine stator.
[0005]
The objective of this invention is providing the stator of a small rotary electric machine.
[0006]
[Means for Solving the Problems]
(1) In order to achieve the above object, the present invention provides a stator core having a stator slot and a stator salient pole formed in the stator core and inserted into the stator slot of the stator core. In a stator of a rotating electric machine having a stator coil to be rotated,
The stator coil isProjecting from both ends of the stator core and the insertion sideCoil endWhen,On the side having the coil drawing end consisting of the winding start part and the winding end partInserted sideCoil endDepartment andHave,SaidInserted sideCoil endThe axial length of the hypotenuseSaidInsert sideCoil endIt is made shorter than the axial length of the hypotenuse.
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 electrical machine can be reduced in size.
(2) In the above (1), preferably, the insertion side coil end part and the insertion side coil end part are each composed of a straight line part and a hypotenuse part, and the insertion side coil end part and the insertion side coil The axial lengths of the end portions are the same, and the axial length of the insertion-side coil end hypotenuse is shorter than the axial length of the insertion-side coil end hypotenuse.
(3) In the above (1), preferably, the insertion side coil end portion is composed of an oblique side portion, the insertion side coil end portion is composed of a straight portion and an oblique side portion, and the insertion side coil end oblique side portion is The axial length is shorter than the axial length of the insertion side coil end hypotenuse.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the structure of the stator of the rotating electrical machine according to the embodiment of the present invention will be described with reference to FIGS.
First, the overall configuration of a rotating electrical machine using a rotating electrical machine stator according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a partial cross-sectional view of a rotating electrical machine using a rotating electrical machine stator according to an embodiment of the present invention as viewed from the front side.
[0008]
In FIG. 1, the stator 20 of the rotating electrical machine 10 includes a stator core 22 and a multiphase stator coil 24 wound around the stator core 22. As will be described later, the stator coil 24 is inserted into a slot formed in the stator core 22 and wound around a salient pole of the stator core 22. The stator 20 is fixedly held on the inner peripheral surface of the housing 40. The rotor 30 includes a rotor core 32, a permanent magnet 36 inserted into a permanent magnet insertion hole 34 provided in the rotor core 32, and a shaft 38. The shaft 38 is rotatably held by bearings 42 and 44. 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.
[0009]
A magnetic pole position detector PS that detects the position of the permanent magnet 36 of the rotor 30 and an encoder E that detects the position of the rotor 30 are arranged on the side surface side of the rotor 30. The rotating electrical machine 10 is controlled by a control device to be described later by a signal from the magnetic pole position detector PS and an output signal from the encoder E.
[0010]
Next, the external configuration of the stator coil 24 used in the stator of the rotating electrical 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 electrical machine according to the embodiment of the present invention.
[0011]
The stator coil 24 is mainly hexagonal as shown in the figure. In the stator coil 24, the insertion side coil end oblique side portion 24A, the insertion side coil end oblique side portion 24B, and the straight portion 24C are wound by a predetermined number of turns, and further, a winding start portion 24Z1 and a winding end portion 24Z2 It has. The stator coil 24 is formed by winding a predetermined number of turns on a coil-winding mold in advance so as to have a shape as shown in FIG.
[0012]
Here, the stator coil 24 is inserted into a slot of the stator core by using a coil insertion device which will be described later with reference to FIG. 6. At this time, the side to be inserted first is the insertion side coil end. The side that is the oblique side portion 24A and is inserted last is the insertion-side coil end oblique side portion 24B.
[0013]
What is characteristic in the present embodiment is that the axial length L1 of the insertion side coil end oblique side portion 24B is shorter than the axial length L2 of the insertion side coil end oblique side portion 24A. In the conventional stator coil, the axial lengths of the coil end oblique sides on the insertion side and the insertion side are equal.
[0014]
Next, the insertion state of the stator coil in the stator core in the stator of the rotating electrical 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 developed in the circumferential direction for one turn of the coil located in the center among the stator coils 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 indicated by a broken line.
[0015]
As described with reference to FIG. 2, in this embodiment, the axial length L1 of the insertion-side coil end hypotenuse 24B is shorter than the axial length L2 of the insertion-side coil end hypotenuse 24A. It is. On the other hand, in the conventional stator coil 24 ′, the axial length LP <b> 2 of the insertion side coil end oblique side 24 </ b> A ′ is equal to the axial length LP <b> 1 of the insertion side coil end oblique side 24 </ b> B ′.
[0016]
The axial length of the straight portion 24 </ b> C of the stator coil 24 is longer than the axial length L <b> 10 of the stator core 22. Therefore, on the insertion side, the insertion-side coil end straight portion 24C1 protrudes from the stator core 22 and constitutes a part of the insertion-side coil end portion. Here, when the axial length of the insertion side coil end straight portion 24C1 is L3, the axial length of the insertion side coil end portion is L5 (= L2 + L3).
[0017]
On the insertion side, the insertion-side coil end straight portion 24C2 protrudes from the stator core 22 and constitutes a part of the insertion-side coil end portion. Here, when the axial length of the insertion-side coil end straight portion 24C2 is L4, the axial length of the insertion-side coil end linear portion is L6 (= L1 + L4).
[0018]
Therefore, the total length (axial length) L7 of the stator is obtained by adding the axial lengths L5 and L6 of the insertion side and inserted side coil end portions to the axial length L10 of the stator core 22. .
[0019]
Here, a specific axial length will be described.
For example, when the axial length L10 of the stator core 22 is 150 mm, in the stator using the conventional stator coil 24 ', the axial length LP5 of the insertion-side coil end portion is 30 mm, Since the axial length LP6 of the side coil end portion is 30 mm, 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 axial length LP3 of the insertion-side coil end linear portion 24C1' is 10 mm. The insertion side coil end oblique side 24B 'has an axial length LP1 of 20 mm, and the insertion side coil end linear part 24C2' has an axial length LP4 of 10 mm.
[0020]
On the other hand, in the stator using 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. The total length (axial length) L7 of the stator 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 24B is 10 mm, and the axial length L4 of the insertion-side coil end linear part 24C2 is 15 mm.
That is, in this embodiment, the total length L7 of the stator can be shortened by 10 mm compared to the conventional full length LP7. Further, the axial length L5 of the insertion side coil end portion is equal to the axial length L6 of the insertion side coil end portion.
[0021]
Here, the coil end portion on the insertion side will be described.
The axial length L2 of the insertion side coil end hypotenuse 24A according to this embodiment is equal to the axial length LP2 of the conventional insertion side coil end hypotenuse 24A '. As will be described later, the insertion-side coil end oblique side is a side to be inserted using a coil insertion device. When inserting the stator coil using the coil insertion device, it is necessary to pass the insertion side of the stator coil to the blade of the coil insertion device, and the necessary part for this insertion is the insertion side coil end hypotenuse 24A. If the length of the portion necessary for the transfer is shortened, it cannot be sufficiently transferred to the blade of the coil insertion device. Therefore, in the present embodiment, the axial length L2 of the insertion-side coil end hypotenuse 24A is conventionally This is equal to the axial length LP2 of the insertion side coil end oblique side 24A ′.
However, the axial length L3 of the insertion side coil end linear portion 24C1 according to the present embodiment is shorter than the axial length LP3 of the conventional insertion side coil end linear portion 24C1 '. This is because, as will be described later, it is easy to insert the inserted coil end portion despite the fact that the lengths L5 and L6 of the coil end portion are shorter than the conventional one.
[0022]
Next, the coil end portion on the insertion side will be described.
The axial length L1 of the insertion side coil end hypotenuse 24B according to the present embodiment is shorter than the axial length LP1 of the conventional insertion side coil end hypotenuse 24B '.
[0023]
The insertion-side coil end oblique side portion is a portion 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 most difficult to insert because the stator coil of another phase inserted before it interferes.
[0024]
Here, as understood by comparing the stator coil end portion according to the present embodiment and the conventional stator coil end portion on the insertion side, in this embodiment, in the axial length of the insertion side coil end portion. Although L6 is shorter than the axial length LP6 of the conventional 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 the same as the conventional insertion side coil end portion LPB. As a result, the axial length L4 of the insertion-side coil end linear portion 24C2 according to the present embodiment is less than the axial length LP1 of the insertion-side coil end oblique side portion 24B ′. The axial length of the insertion-side coil end straight portion 24C2 ′ can be made longer than LP4. As a result, in the present embodiment, the space SP increases by the amount indicated by hatching in the drawing on the side close to the slot into which the coil is inserted (the side of the stator coil end straight portion 24C2). Since interference due to the inserted coil at the time of inserting the coil is caused by the narrowness of this space, it can be widened by the space SP, so that insertion using a coil insertion device is easier than before.
[0025]
Here, the ease of insertion of the stator coil in the stator of the rotating electrical 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. 4B shows the insertion state of the stator coil according to the conventional method.
[0026]
As shown in FIG. 4A, after inserting the U-phase stator coil 24U into the stator slot 22B formed in the stator core 22, the V-phase stator coil 24V is inserted. In the present embodiment, the space SP shown in FIG. 3 exists as a gap as shown by hatching in the figure, so that the V-phase stator coil 24V is in the pocket of the U-phase stator coil 24U. Will enter. Here, since the V-phase stator coil 24V can be formed in the same plane (in the radial direction) as the U-phase stator coil 24U, the V-phase stator coil 24V can be formed without receiving the positional interference of the U-phase stator coil 24U. Can be inserted.
[0027]
On the other hand, FIG. 4B illustrates a case where the length LP4 of the inserted coil end straight portion 24C ′ is shortened in order to shorten the axial length of the stator coil indicated by the broken line in FIG. ing. When the insertion-side coil end straight line portion is shortened, in other words, when the space surrounded by the stator core side end and the non-insertion side coil end portion is narrowed, when the coil is inserted into the slot, the vicinity of this straight line portion is reduced. In particular, it is pulled and interference with adjacent coils becomes strong, making insertion 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 ′ becomes the U-phase stator coil 24U. It cannot be inserted due to interference.
[0028]
Next, a method for inserting a stator coil in the stator of the rotating electrical 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 electrical machine according to the present embodiment will be described with reference to FIG.
FIG. 5 is a partial cross-sectional view showing an inserted state of the stator coil in the stator of the rotating electrical machine according to the embodiment of the present invention.
[0029]
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 existing between them. An insulating slot liner 26 is mounted in the slot 22B from the opening 22C between the adjacent stator salient pole portions 22A, and the stator coil 24 that has been previously wound 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. Further, when the stator coil 24 is inserted, a wedge 28 formed in advance is attached to the position of the opening 22C to prevent the stator coil 24 from popping out.
[0030]
Next, a method for inserting a stator coil by the coil insertion device will be described with reference to FIGS. 6 and 7.
FIG. 6 is an explanatory diagram of a method of inserting a stator coil by the coil insertion device, and FIG. 7 is a cross-sectional view taken along line AB of FIG. The same reference numerals as those in FIG. 5 indicate the same parts.
[0031]
The illustrated coil insertion device includes a housing 110, a blade 111, a blade holder 112, a coil insertion stripper 113, a rod 14, a bolt 115, a wedge guide 16, and a wedge pusher 17. .
[0032]
The housing 110 is formed in 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 attached inside the housing 110. The blade 111 is formed by arranging a plurality of rod-shaped members facing upward in a circular comb shape, and is attached to the periphery. In addition, a wedge guide 116 is provided on the outer peripheral side of the blade 111 inside the housing 110. The wedge guide 116 is formed by arranging a plurality of rod-shaped members facing upward 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.
[0033]
Here, each of the blade 111 and the wedge guide 116 has a cross-sectional shape as shown in FIG. 7, and the wedge guides 116 are combined on the outside of the blade 111 in a one-to-one manner as shown in the figure. 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 peripheral surfaces thereof are spaced at intervals corresponding to the openings 22C of the slots 22B in the circumferential direction. These are arranged in an annular shape so as to face each stator salient pole portion 22A.
[0034]
The stripper 113 is made of a member having a substantially circular shape when viewed from the upper side of FIG. 6, and a plurality of vertical grooves into which the blade 111 is inserted are formed in the peripheral portion thereof. The stripper 113 is attached to the rod 114 by a bolt 115. The 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 is also moved up and down, and the stator coil 24 is moved along the inner peripheral surface (back surface) of the blade 111 and inserted into the slot 22B.
[0035]
As with the wedge guide 116, the wedge pusher 117 is configured by arranging a plurality of bar members facing upward in a circular comb shape. The wedge pusher 117 is disposed between the wedge guides 116 and is connected to driving means such as a fluid pressure cylinder (not shown). The wedge pusher 117 is moved up and down together with the stripper 113 by this driving means, and as shown in FIG. 7, the lower end of the wedge 28 held between the two wedge guides 116 is pushed and fixed. It is inserted into the slot 22B together with the child coil 24.
[0036]
Next, the insertion operation of the stator coil 24 by this insertion device will be described.
First, the stripper 113 is moved to the root side of the blade 111, that is, the lower position in FIG. Next, among the plurality of blades 111 arranged in the circumferential direction, the blade 111 corresponding to the two slots into which the stator coil 24 is to be inserted is selected, and the stator wound around these in advance is selected. A portion to be a coil end portion of the coil is passed and held, and the wedge 120 is held between the wedge guides 116 corresponding to the slots.
[0037]
On the other hand, a stator core 20 having a slot liner 26 mounted in each slot 22B is prepared in advance, and this is arranged above the blades 111 arranged in an annular shape as shown in FIG. Insert from. At this time, the stator salient pole portions 22 </ b> A of the stator core 20 are made to face the blades 111.
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 at this position by a stator core position determining device (not shown).
[0038]
Next, the rod 114 is moved in the forward direction (upward) by driving means (not shown), the stripper 113 is advanced in the ring of the blade 111, and the coil 24 held by the blade 111 is inserted into the slot of the stator core 22. At the same time, the wedge pusher 117 is moved by the driving means and the wedge 120 held between the wedge guides 116 is moved into the slot liner 26 inside the slot liner 26. Insert into the part 22C side.
[0039]
Next, the insertion result of the stator coil in the stator of the rotating electrical machine according to the present embodiment will be described with reference to FIG.
The horizontal axis of FIG. 8 shows each phase of the U-phase, V-phase, and W-phase, and the vertical axis shows the force (insertion force) of the driving device required when inserting the stator coil of each phase.
[0040]
A solid line A in FIG. 8 indicates 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 (space factor) indicated by 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 inserting the V-phase stator coil is 550 kg · f. The insertion force when the W-phase stator coil is inserted is 650 kg · f.
[0041]
The broken line C in FIG. 8 indicates the insertion force for each phase when the conventional stator coil having the shape indicated 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. 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 the W-phase stator coil is inserted is 600 kg · f.
[0042]
In the conventional device, the insertion force is smaller than that in the present embodiment. However, when the axial length of the conventional stator coil is simply shortened, the stator coil cannot be inserted into the stator slot even if the insertion force is increased. 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 shortened.
[0043]
Further, a solid line B in FIG. 8 indicates an 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 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 · f.
[0044]
In recent years, the coil space factor tends to be increased in order to reduce the size and increase the efficiency of rotating electrical machines. When the space factor increases, the number of windings of the stator coil inserted into the stator slot increases, so that the insertion becomes difficult. However, in this embodiment, as indicated by the solid line B in FIG. 8, the insertion force is increased, but the space factor is improved to 70%, and the axial length of the stator is shortened. The stator coil can be inserted. Therefore, the space factor can be increased to increase the efficiency, and the axial length of the stator can be shortened to reduce the size of the rotating electrical machine.
[0045]
In the stator coil according to the present embodiment, the axial length can be shortened, and the axial length of the insertion-side coil end portion is equal to the axial length of the insertion-side coil end portion as described in FIG. can do. The axial length of the coil end portion is closely related to the coil end leakage permeance of the leakage reactance due to the leakage magnetic flux of the stator, and the axial length is different on both side ends of the coil. Since the leakage permeance is different and the leakage reactance is changed, the performance of the rotating electrical machine may be deteriorated. However, in this embodiment, the performance of the rotating electrical machine can be improved.
[0046]
As described above, according to this embodiment, the stator of the rotating electrical machine can be reduced in size.
Moreover, the space factor of the stator coil inserted into the slot can be increased, and the performance of the rotating electrical machine can be improved.
[0047]
Next, the insertion state of the stator coil in the stator core in the stator of the rotating electrical 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 in which the stator coil is inserted into the stator core in the stator of the rotating electrical machine according to the second embodiment of the present invention.
[0048]
FIG. 9 shows a state in which the stator core 22 is developed in the circumferential direction with respect to a coil of one turn located in the center among the stator coils 24 inserted into the stator core 22, as in FIG. 3. ing. 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 indicated by a broken line.
[0049]
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. 3 is not provided, and instead the insertion side coil end straight portion 24C2 has an axial length L4 'of 20 mm. That is, the coil insertion position is shifted to the right by 5 mm with respect to the stator coil 24 shown in FIG.
[0050]
As a result of such an insertion position, as shown in the figure, on the side close to the slot into which the coil is inserted (the stator coil end straight portion 24C2 side), the space SP 'is shown by hatching in the figure. It can be increased compared to the space SP shown in FIG. Therefore, the insertion using the coil insertion device is facilitated as compared with the configuration shown in FIG.
[0051]
As described above, according to this embodiment, the stator of the rotating electrical machine can be reduced in size.
[0052]
Next, the insertion state of the stator coil in the stator core in the stator of the rotating electrical machine according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 10 is an explanatory diagram of a state in which the stator coil is inserted into the stator core in the stator of the rotating electrical machine according to the third embodiment of the present invention.
[0053]
10, as in FIGS. 3 and 9, the stator core 22 is developed in the circumferential direction for one turn of the coil located in the center among the stator coils 24 inserted into the stator core 22. Indicates the state. 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 indicated by a broken line.
[0054]
The axial length L7 ′ of the stator coil 24 ″ according to the present embodiment is 195 mm shorter by 5 mm than the axial length L7 of the stationary coil 24 shown in FIG. 3. On the insertion side, FIG. 9, the insertion-side coil end straight line portion 24C1 shown in Fig. 3 is eliminated, and the insertion-side coil similar to that shown in Fig. 3 is removed on the insertion side. The end is arranged.
[0055]
As a result of such an insertion position, the insertion side has the insertion side coil end oblique side portion 24A, so that the coil can be inserted by the coil insertion device, and on the insertion side, the slot into which the coil is inserted is inserted. Since the space SP is provided on the near side (the stator coil end straight portion 24C2 side), the insertion becomes easier than in the prior art. In addition, the axial length of the stator coil can be shortened, and the stator can be miniaturized.
[0056]
As described above, according to this embodiment, the stator of the rotating electrical machine can be reduced in size.
[0057]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the stator of a rotary electric machine can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a rotating electrical machine using a rotating electrical machine stator according to an 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 in the stator of the rotating electrical machine according to the embodiment of the present invention.
FIG. 3 is an explanatory diagram of a state in which a stator coil is inserted into a stator core in a stator of a rotating electrical 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 electrical machine according to an embodiment of the present invention.
FIG. 5 is a partial cross-sectional view showing an inserted state of the stator coil in the stator of the rotating electrical machine according to the embodiment of the present invention.
FIG. 6 is an explanatory diagram of a method of inserting a stator coil by a coil insertion device.
7 is a cross-sectional view taken along the line AB of FIG.
FIG. 8 is an explanatory diagram of a result of inserting a stator coil in the stator of the rotating electrical machine according to the embodiment of the present invention.
FIG. 9 is an explanatory diagram of a state in which a stator coil is inserted into a stator core in a stator of a rotating electrical machine according to a second embodiment of the present invention.
FIG. 10 is an explanatory diagram of a state in which 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]
10: Rotating electric machine
20 ... Stator
22 ... Stator core
22A ... Stator pole part
22B ... Slot
22C ... opening
24 ... Stator coil
24A: Insert side coil end hypotenuse
24B ... non-insertion side coil end hypotenuse
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

Claims (3)

In a stator of a rotating electrical machine having a stator core having a stator slot, and a stator coil inserted in a stator slot of the stator core and wound around a stator salient pole formed on the stator core ,
The stator coil is configured to protrude from both ends of the stator core, the insertion side coil end portion, and the insertion side coil end portion of the side having the coil leading end portion comprising a winding start portion and a winding end portion Have
The stator of the rotating electric machine, characterized in that the axial length of the insertion side coil end oblique portion and shorter than the axial length of the insertion side coil end oblique portion. In the stator of the rotating electrical machine according to claim 1,
The insertion side coil end part and the insertion side coil end part are each composed of a straight line part and a hypotenuse part,
The axial lengths of the insertion side coil end portion and the insertion side coil end portion are equal,
A stator for a rotating electrical machine, characterized in that the axial length of the insertion-side coil end hypotenuse is shorter than the axial length of the insertion-side coil end hypotenuse. In the stator of the rotating electrical machine according to claim 1,
The insertion side coil end portion is composed of a hypotenuse portion,
The insertion side coil end part is composed of a straight line part and a hypotenuse part,
A stator for a rotating electrical machine, characterized in that the axial length of the insertion-side coil end hypotenuse is shorter than the axial length of the insertion-side coil end hypotenuse.

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