JP2000069700A - Polyphase corrugate winding for electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide polyphase corrugate winding for electric rotating machine, capable of reducing the space of a coil end part and the loss of resistance power. SOLUTION: A front end 222 of a cross conductor 22 is radially displaced by the roughly radial thickness or larger of the crossover conductor by a step- difference 223, so that only by storing the respective phases of coils 2a, 2b, 2c manufactured by press molding into a slot, winding can be almost finished and be much more simplified than in a conventional complex winding process, which had been conducted using a winding machine or manually. The three- dimensional shapes of the respective crossover conductors 22 are made roughly equal, as compared with the curved-molding of the cross conductor of the conventional coil conductor, and since a coil end can be manufactured by sequentially shifting circumferentially the respective conductors 22 plastically deformed into the identical shape, it is possible to significantly miniaturize (particularly downsizing in the radial direction) the coil end than the conventional one, and eliminate the loss of resistance power caused by wasteful wiring extension of the crossover conductors 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-phase winding of a rotary electric machine.

[0002]

2. Description of the Related Art As a method for winding a stator winding or a rotor winding of a rotating electric machine such as a motor or a generator, a predetermined number of conductors are wound around one magnetic pole, and after the winding is completed, the next magnetic pole is wound. A moving concentrated winding and a wave winding in which a conductor is wound in a wave shape are known.

[0003]

However, in the case of concentrated winding, since winding is performed for each magnetic pole, it takes a long time to manufacture. Also, in the case of wave winding, when winding a three-phase coil widely used in a rotating electric machine, the coil end portion is overlapped, so that the space of the coil end portion is increased and the physical size of the rotating electric machine is increased. In addition, there is a problem that the resistance power loss in the total conductor length of the coil end increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a multi-phase wave winding of a rotating electric machine capable of reducing the space at the coil end and the resistance power loss. .

[0005]

In one embodiment of the present invention, one end and the other end of the leading end of the crossover conductor are radially greater than or substantially equal to the radial thickness of the crossover conductor. Because it is displaced, winding can be almost completed just by accommodating the coil conductors of each phase produced by press molding etc. in the slot, and the conventional complicated method that was performed using a winding machine or manually The winding becomes much simpler for a simple winding process.

In addition, the three-dimensional shape of each of the transition conductors can be made substantially equal to each other, and each of the transition conductors plastically deformed to have the same shape as compared with the case where the transition conductor of the conventional coil conductor is curved. Since the coil end can be created by arranging the parts sequentially in the circumferential direction,
The coil end can be made much smaller (especially in the radial direction) than before, and there is no resistance power loss due to unnecessary wiring extension of the transition conductor, and the gap between each transition conductor at the coil end. Therefore, there is no problem that a part of the crossover conductor is difficult to cool.

According to a second aspect of the present invention, in the multi-phase wave winding of the rotating electric machine according to the first aspect, the leading end of the crossover conductor is radially larger than the thickness of the crossover conductor substantially in the radial direction. Since there is no step, there is no need to plastically or elastically deform the portion other than the step in the radial direction, and the manufacture and assembly of the coil conductor become easy. According to a third aspect of the present invention, in the multi-phase winding of the rotary electric machine according to the first or second aspect, the coil conductor is linear while maintaining a posture in which the radial direction of the core matches the thickness direction. Since the conductor thin plate is formed by plastic deformation, a step is easily formed, and the manufacture of the coil conductor is facilitated.

According to a fourth aspect of the present invention, in the multi-phase wave winding of the rotary electric machine according to any one of the first to third aspects, the coil conductor is thinner in the radial direction of the core and substantially square in shape in the circumferential direction. Since it has a width smaller than the opening width of the slot at least at the time of inserting the coil conductor, it is possible to almost complete the winding work only by pushing the slot conductor portion of the coil conductor formed in advance in the radial direction. it can. After inserting the slot conductor into the slot, the opening of the slot may be squeezed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the following examples. It is needless to say that the three-phase stator coil of the present invention can be employed not only as a stator coil but also as a rotor coil.

[0010]

Embodiment 1 An embodiment of a three-phase motor in which a wave winding according to the present invention is applied to a stator winding (stator coil) will be described.
1 shows a plan view of a stator of the motor, FIG. 2 shows a front view, FIG. 3 shows a part of a coil 2, and FIG. 5 shows an entire developed view of a coil (three-phase stator coil) 2. .

Reference numeral 1 denotes a stator core formed by laminating thin plate-shaped electrode steel plates, and has a large number of slots opened on the inner diameter side. In each slot, a star-connected three-phase two-layer wave-wound stator coil (hereinafter, also simply referred to as a coil) 2 is wound. A plate-shaped wedge 4 for preventing protrusion is fitted.
An insulator 3 for insulating the coil 2 and the core 1 from each other is inserted into the inner periphery of the slot.

The coil 2 has a linear slot conductor 21 inserted into the slot, and a transition conductor 22 formed integrally with the slot conductor 21.
Are individually connected to the same ends of a pair of slot conductors 21 inserted into slots on both sides sandwiching two slots. As shown in FIG. 1, the coil 2 includes three phase coils (coil conductors) 2a, 2b, and 2c. As shown in FIG.
It comprises a forward conductor portion 21a extending in a forward direction away from the start ends of 2b and 2c, and a return conductor portion 21b extending in a return direction approaching from the start ends of the coils 2a, 2b and 2c. Therefore, the coil ends on both sides of the slot are, to be precise, composed of both ends of the slot conductor 21 and the transition conductor 22, and each transition conductor 22 is connected to the slot conductor 21 as shown in FIG. On the other hand, it extends circumferentially and axially on the imaginary cylindrical surface, and is radially stepped by the thickness of the crossover conductor portion 22 in the radial direction at the central portion protruding toward the axially opposite core side of the crossover conductor portion 22. 223 each one.

Hereinafter, the coil 2 will be described in more detail with reference to FIG. FIG. 3A is a partial plan view showing a state before the slot is inserted into the coil 2 before being formed into a cylindrical shape, and FIG. 3B is a partial plan view showing the formed state shown in FIG. FIG. 3C is a front view showing a state in which the phase coil (coil conductor) 21 a of the coil 2 is viewed in the extending direction (x direction) of the slot conductor portion 21, and FIG. It is a front view showing the state seen in the extension direction (x direction).

Before being bent into a cylindrical shape, the transition conductor portion 22 is connected to one end of the going conductor portion 21a of the adjacent slot conductor portion 21 of the same coil conductor 21a and the slot conductor portion 2a.
In order to connect with one end of one return conductor portion 21b, it extends on the same plane as the slot conductor portion 21 at an angle to the x direction. The transition conductor portion 22 includes an overlapping portion 221 that radially overlaps with another transition conductor portion 22 that is adjacent in the circumferential direction,
Tip portion 22 that projects further in the axial direction than overlapping portion 221
2, and has a step 223 which is located at the center of the tip end portion 222 and extends in the radial direction and is equal to or larger than the substantially radial thickness of the conductor portion.

In this manner, the thickness of the coil end can be reduced to approximately twice the thickness of the crossover conductor portion 22, and the axial protrusion of the coil end can be reduced. it can. Furthermore, after the coil 2 is formed, it can be inserted into the slot, and the coil assembling process can be simplified. The coil 2 has six coil conductors 23 to 28 arranged in parallel at a distance of one slot pitch, the coil conductors 23 and 27 constitute a phase coil 2a, and the coil conductors 24 and 28 constitute a phase coil 2b. The coil conductors 25 and 26 constitute the phase coil 2c. Each of the coil conductors 23 to 28 has a substantially rectangular cross-sectional shape which is thin in the radial direction of the stator core 1 and wide in the circumferential direction, and includes a slot conductor portion 21 including a going conductor portion 21a and a return conductor portion 21b, and a going conductor portion 21a. And a crossover conductor portion 22 that connects the return conductor portion 21b, and is bent in a zigzag shape.

Further, among the starting ends of the six coil conductors 23 to 28, the second, fourth and sixth starting ends are short-circuited to each other to be a neutral point, and the remaining first, third and fifth starting ends are: The terminals of each phase coil 2a, 2b, 2c connected in a three-phase star configuration.
However, in FIG. 5, the step 223 is provided in a direction different from that shown in FIG.

(Molding of Coil 2) Hereinafter, the molding and assembly of the coil 2 will be described. First, the six coil conductors 23 to 28 are arranged in parallel at a distance of one slot pitch. The slot conductor portion 21 and the transition conductor portion 22 are each formed in a linear band shape, and the transition conductor portion 22 has an appropriate angle (here, about 60
Degrees).

Next, as shown in FIG.
The first six transition conductors 22 counted from the starting ends 23 to 28 of the coil conductors 23 to 28 are provided with steps 223 such that the first slot conductors 21 are at the bottom. 21 overlaps the first slot conductor 21 of the coil conductor 27, and so on, the second slot conductor 21 of the coil conductor 24 overlaps the first slot conductor 21 of the coil conductor 28, and so on. 2
The second slot conductor 21 of 6 overlaps the first slot conductor 21 of the coil conductor 25.

Hereinafter, steps 223 are sequentially provided, and six coil conductors 23 to 28 are accommodated in each slot in two layers. As a result, each of the coil conductors 23 to 28 makes one round,
Two turns of the coil are formed in two layers in the slot.
Next, by providing a step 223 in the opposite direction to the conventional one, the subsequent slot conductor portion 21 becomes 3 in the slot.
It can be smoothly arranged on the fourth layer, and the six coil conductors 23 to 28 are accommodated in four layers in each slot. As a result, the coil conductors 23 to 28 perform the next round, and coils for four turns are formed in four layers in the slot. Hereinafter, the required number of turns is produced in the same procedure as described above.

Next, after making a predetermined turn, as shown in FIG. 5, the final transition conductor portions of the coil conductors 23 to 28 are:
The length of the transition conductor 22 is about half the length of the transition conductor 22 so far, and the final transition conductor 22 of the coil conductors 27, 25, and 28 is symmetrical to the final transition conductor 22 of the coil conductors 23, 26, and 24. Obliquely installed. As a result, as shown in FIG. 5, the tips of the final transition conductors 22 of the coil conductors 23 and 27 overlap, the tips of the final transition conductor 22 of the coil conductors 24 and 28 overlap, and the coil conductors 25 and 26 overlap. The leading ends of the final crossover conductor portions 22 overlap, and by welding these overlapping portions, a three-phase stator coil is formed.

Next, the coil 2 manufactured as described above is inserted into each slot of the stator core 1. The starting ends of the coil conductors 202, 204, and 206 are short-circuited to a neutral point. (Insertion into Core) Next, insertion of the three-phase stator coil 2 manufactured as described above into the stator core 1 will be described below with reference to FIGS.

The stator core 1 is formed by combining core pieces 11 divided into the same shape by the same number as the number of the slots 10 as shown in FIG. The assembled three-phase stator coil 2 is held by a coil holding device (not shown) and fixed in a state shown in FIG. The core piece holding device is arranged radially outside the three-phase stator coil 2. This core piece holding device has the same number of core piece holding tools as the number of core pieces 11, and each of the core piece holding tools is arranged radially outside the three-phase stator coil 2 at a constant circumferential pitch. Are individually pinched in the axial direction.
Next, the core piece holders are simultaneously moved at a constant speed in the diameter reducing direction, whereby the teeth 12 of each core piece 11 are inserted between the slot conductor portions 21 (see FIG. 6). Thereafter, each core piece 11 is further moved in the diameter reducing direction, so that each core piece 11 finally becomes one stator core 1 as shown in FIG. Finally, the joining edge 11c that is exposed on the outer peripheral surface and extends in the axial direction is welded in the axial direction to complete the stator core 1, and the winding operation of the three-phase stator coil 2 is also completed.

This split core type stator core 1 is particularly practical in that when it is combined with the above-described three-phase stator coil 2 having a step at the axial end of the crossover conductor portion 22, its winding work can be simplified. Excellent in nature. Further, in this embodiment, since the outer peripheral portion 11a of the core piece 11 extends to one side in the circumferential direction, the area of the contact portion 11b between the adjacent core pieces 11 can be increased, and as a result, There is an excellent advantage that the magnetic resistance at the contact portion 11b between the core pieces 11 can be reduced and the motor output can be greatly improved.

The outer peripheral portion 11a of the core piece 11 is shown in FIG.
It goes without saying that the core piece 11 can be extended longer than that shown in the embodiment of FIG. 7, and when the diameter of each core piece 11 is reduced, the core piece 11 is not only simply operated in the centripetal direction but also reduced by a so-called spiral movement. The good thing is, of course.

[0025]

Embodiment 2 Another embodiment will be described with reference to FIG. However, in order to facilitate understanding, the same reference numerals are given to components having the same main function. FIG. 4 is a partial plan view showing a state before the slot insertion of the coil 2 before being formed into a cylindrical shape and before being bent into a cylindrical shape. In this modified example, in the coil 2 shown in FIG. 3A, the tip portion 222 protruding further in the axial direction than the overlapping portion 221 has four bending portions 224, which are sequentially refracted by the four bending portions 224. In the radial direction (here, in the direction perpendicular to the plane of the paper), the transition conductor portion 22 has a thickness of 22
He is making a step. This facilitates the step machining of this portion.

Since both ends of the distal end portion 222 need only be displaced in the radial direction by the thickness thereof, they may be displaced continuously between them.

[0027]

Modification In the above embodiment, a rectangular conductor having a rectangular cross section was used, but a round wire may be used. A plurality of conductors may be arranged in the circumferential direction to form one coil conductor. Further, the bending direction of the crossover conductor portion 22 is not limited to the above, and may be any one that increases the required space of the coil end portion.

Further, a step 223 may be provided for each coil conductor, and six coils may be knitted.

[Brief description of the drawings]

FIG. 1 is a plan view of a stator in an embodiment of a three-phase motor in which a wave winding of the present invention is applied to a stator winding.

FIG. 2 is a front view of the stator shown in FIG.

FIG. 3 (a) is a partial plan view showing a state before insertion of a slot of the coil 2 before molding and bending into a cylindrical shape, and FIG. 3 (b) is a plan view of FIG. 3 (a). FIG. 3C is a front view showing a state in which the phase coil (coil conductor) 21 a of the formed coil 2 shown in the drawing is viewed in the extending direction (x direction) of the slot conductor 21, and FIG. It is a front view showing the state where slot conductor part 21 was seen in the extension direction (x direction).

FIG. 4 is a partial plan view showing a state before insertion of a slot of a coil 2 before being formed into a cylindrical shape and curved in a second embodiment.

FIG. 5 is a development view of the coil 2 of the first and second embodiments.

FIG. 6 is a schematic partial front view (reduced diameter state) showing an operation of inserting the coil 2 into the split type stator core.

FIG. 7 is a schematic partial front view showing the operation of inserting the coil 2 into the split type stator core (diameter reduction completed state).

[Explanation of symbols]

1 is a stator core, 2 is a coil, 21 is a slot conductor,
22 is a transition conductor part, 221 is an overlapping part of the transition conductor part 22, 222 is a tip part of the transition conductor part 22, and 223 is a step of the transition conductor part 22.

Claims (4)

[Claims] 1. A slot conductor portion comprising a forward conductor portion and a return conductor portion alternately inserted into each slot of a core, and the same side of the forward conductor portion and the return conductor portion integrally formed with the slot conductor portion. A coil conductor of each phase consisting of a transition conductor portion forming a coil end by connecting the ends is wave-wound, and the transition conductor portion radially overlaps with another transition conductor portion that is adjacent in the circumferential direction. In a multi-phase wave winding of a rotating electrical machine having an overlapping portion and a tip portion further projecting in the axial direction than the overlapping portion, one end and the other end of the tip portion of the crossover conductor portion are radially opposite to each other. A multi-phase wave winding for a rotating electrical machine, characterized in that the transition conductor is displaced by at least a substantially radial thickness. 2. The multi-phase wave winding of a rotating electric machine according to claim 1, wherein a tip portion of the transition conductor has a step in a radial direction which is equal to or greater than a thickness of the transition conductor substantially in a radial direction. Characteristic multi-phase wave winding of rotating electric machine. 3. The multi-phase wave wound winding of a rotating electric machine according to claim 1, wherein the coil conductor is formed by plasticizing a linear conductor thin plate while maintaining a posture in which a radial direction of a core coincides with a thickness direction. A multi-phase wave winding of a rotating electric machine, which is formed by deformation. 4. The multi-phase wave winding of a rotary electric machine according to claim 1, wherein said coil conductor has a substantially rectangular cross-sectional shape which is thin in a radial direction of said core and wide in a circumferential direction. And a width smaller than the opening width of the slot.