JP2003189521A - Distributed-winding motor, cassette coil, and method of manufacturing cassette coil element piece and cassette coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the downsizing of a motor by lessening the volume of a section crossing a slot, and to facilitate the output improvement of the motor by materializing the lined-up winding within the slot thereby raising the in-slot coil occupation factor. <P>SOLUTION: In a one-layer drawn-up winding process in S1, six pieces, in one layer, of coil wires are wound in line, and in a multilayer conversion process in S3, the slot section is converted from one-layer lined-up lap winding into three-layer lined-up lap winding so as to form a cassette coil element piece. Next, in a cassette coil element piece providing process in S5, six pieces of cassette coil element pieces different bit by bit in shape are provided, and in a stacking process in S7, they are stacked in order within a mold, and in a molding process in S9, they are molded into specified form, and in a heating fusion process in S11, the six pieces of cassette coil element pieces are united by heating fusion to make a cassette coil. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a distributed winding motor,
The present invention relates to a cassette coil, a method for manufacturing a cassette coil piece, and a method for manufacturing a cassette coil.

[0002]

2. Description of the Related Art In a coil of a distributed winding motor of N-phase excitation, a plurality of conductor wires are continuously arranged in each slot corresponding to each excitation phase. Therefore, the winding method of the coil of the distributed winding motor is different from the winding method of the concentrated winding motor, which is relatively easy to perform the aligned winding and forming, because the conductor wire portion extends between the slots. For example, in the case of three-phase excitation, since there are three kinds of conductor wires that cross the slots, the conductor wires of the parts that cross the slots are arranged while intersecting the conductor wires of other excitation phases. Further, when arranging the conductor wire in the slot, the conductor wire of the excitation phase that has crossed over between the slots and the conductor wire of the other excitation phase is inserted so as to be slid from the opening of the slot,
It is made to cross toward the next slot while crossing the conductor wire of another excitation phase again.

[0003]

Thus, by paying special attention to the distributed winding motor, a plurality of conductor wires are continuously arranged in each slot corresponding to each excitation phase of the distributed winding motor, You can wind the coil. However, since the part that crosses the slots intersects with the conductor wires of other excitation phases in a complicated manner, it does not form an aligned winding and is difficult to form, and the volume of the part that crosses the slots, that is, the coil end part, becomes large. It is difficult to downsize. In addition, since the portion that crosses the slot is not aligned-wound, it is difficult to align-wound the portion disposed in the slot, the coil occupation efficiency in the slot is low, and there is a problem in improving the output of the motor.

The object of the present invention is to solve the problems of the prior art, to reduce the volume of the portion across the slot to facilitate the miniaturization of the motor, and to realize the aligned winding in the slot to occupy the coil occupancy in the slot. To provide a distributed winding motor, a cassette coil, a method for manufacturing a cassette coil piece, and a method for manufacturing a cassette coil that facilitates improving the output of the motor.

[0005]

In order to achieve the above object, in a distributed winding motor according to the present invention, a plurality of coil wires are continuously arranged in each slot corresponding to each excitation phase of an N-phase excitation motor. In the distributed winding motor, the plurality of coil wires are arranged in alignment, and when the aligned length of the coil in the portion housed in the slot is L1 and the width of the coil in the portion that crosses the slot is L2, It is characterized in that L2 is approximately L1 / N or less.

Further, the cassette coil according to the present invention is N
A cassette coil in which a plurality of coil wires are continuously arranged in at least two slots of slots corresponding to each excitation phase of a phase excitation motor, wherein the plurality of coil wires are arranged in line and housed in the slots. When the aligned length of the coil in the portion to be filled is L1 and the width of the coil in the portion that crosses the slot is L2, L2 is characterized by being approximately L1 / N or less.

Further, the method for manufacturing a cassette coil element according to the present invention is a cassette coil element in which a plurality of coil wires are continuously arranged in at least two slots of the slots corresponding to each excitation phase of the N-phase excitation motor. A method of manufacturing a piece, wherein the plurality of coil wires correspond to a positional relationship between the two slots, while forming a slot portion arranged in the slot and a crossing portion crossing the two slots,
A single-layer aligned winding step of aligning and winding in a single layer, and a multi-layer converting step of converting the slot portions of the plurality of coil wires wound in the single-layer aligned-lapped winding from the single-layer aligned-lap winding to the multilayer aligned-lap winding. It is characterized by being provided.

In the method for manufacturing a cassette coil according to the present invention, a plurality of coil wires having a heat-meltable insulating film are continuously provided in at least two slots corresponding to each excitation phase of the N-phase excitation motor. A method of manufacturing a cassette coil, wherein a plurality of coil wires are formed corresponding to a positional relationship between the two slots, and a slot portion arranged in the slot and a crossover portion crossing the two slots are formed. While, in a single layer aligned and lap wound, converting the slot portion of the plurality of coil wires wound in the single layer aligned lap winding from the single layer aligned lap winding to the multilayer aligned lap winding,
A cassette coil piece forming process of forming a cassette coil piece and a predetermined number of cassette coil pieces are overlapped with the slot portions and the transition portions aligned with each other, and heat is applied to melt the heat-melting insulating film to form a cassette coil piece. And a step of heat-bonding the pieces to each other. After the heat-bonding, when the aligned length of the coil in the slot portion is L1 and the width of the coil in the crossover portion is L2, L2 is approximately It is characterized by being L1 / N or less.

In the distributed winding motor according to the present invention, a plurality of coil wires, which are continuously arranged, are aligned and arranged in each slot corresponding to each excitation phase of the N-phase excitation motor, and are housed in the slots. When the aligned length of the coil of the portion is L1 and the width of the coil of the portion that crosses the slot is L2, L2 is
Is approximately L1 / N or less.

Here, the coil alignment length L1 of the portion accommodated in the slot means that a plurality of coil wires arranged in one slot are aligned in the depth direction of the slot, that is, in the radial direction of the motor. When it is arranged, it means the length of alignment along the radial direction. The width L2 of the coil across the slots means the width of one exciting phase of the coil wire extending between the slots along the radial direction of the motor, that is, the depth direction of the slots. That is, the entire width of the coil in the portion that crosses the slots for N excitation phases is N * L2 along the radial direction of the motor. That L2 is approximately L1 / N or less means that the entire width of the coil in the portion crossing the slots for N excitation phases is more than the aligned length of the coil in the portion arranged in the slot along the radial direction of the motor. Indicates at least short. That is, with respect to the radial dimension of the motor, the width occupied by the portion that crosses the slot is within the length of the aligned length of the coil in the portion arranged in the slot.

For example, in a three-phase excitation motor, the number of coil windings is 36, and the portion across the slot is (width * height) = 6.
When aligned in * 6, the above condition is satisfied by adopting a structure in which the portion arranged in the slot is (aligned length * overlap) = 18 * 2. As described above, the distributed winding motor according to the present invention can reduce the volume of the portion crossing the slots by making the arrangement of the portions crossing the slots and the arrangement of the portions arranged in the slots satisfy predetermined conditions. As a result, it is possible to easily downsize the motor, realize aligned winding in the slot, increase the coil occupancy in the slot, and easily improve the output of the motor.

When manufacturing a cassette coil having a large number of windings, the number of windings of the coil wire is divided into a predetermined number and manufactured in units of cassette coil pieces having a small number of windings, and a predetermined number of the cassette coil pieces are integrated. It is convenient to use one cassette coil. For example, when the number of coil turns of the cassette coil is 36, a cassette coil piece having 6 coil turns is manufactured, and 6 cassette coil pieces are integrated to obtain a cassette coil having 36 coil turns. You can

In the method for manufacturing a cassette coil piece according to the present invention, a plurality of coil wires are arranged in a slot corresponding to the arrangement relationship of the two slots, and a slot portion arranged in the slot and a connecting portion crossing the two slots. As it is being formed, it is aligned and lap wound in one layer and then the slot portion is converted from a one-layer lap winding to a multi-layer lap winding. Therefore, while the width of the crossover portion is one coil wire layer, the aligned length of the slot portion can be one coil wire multilayer layer. Now, by setting the number of layers in the multi-layer to be N, which is the number of excitation phases of the distributed winding motor, the width of the crossover portion is set to 1 of the alignment length of the slot portion.
Can be / N.

Further, in the method for manufacturing a cassette coil according to the present invention, the cassette coil pieces described above are overlapped by a predetermined number with the slot portions and the crossover portions aligned, and heat is applied to form a heat-melting insulating coating on the coil wire. Melt and fuse the cassette coil pieces together. By setting the number of layers in the multilayer to be the number of exciting layers N when the cassette coil pieces are converted into the multilayer aligned winding, the aligned length of the coil in the slot portion after heat fusion is L.
1 and the width of the coil at the crossover is L2, L2
Can be approximately L1 / N or less.

For example, in a three-phase excitation motor, when the number of coil turns is 36, first of all, in the cassette coil piece with six coil turns, the portion across the slot is (number of layers * overlap).
= 1 * 6 are aligned, and the portions arranged in the slots are converted to (number of layers * overlap) = 3 * 2. By stacking 6 of these cassette coil pieces, the number of coil turns is 36, and the part across the slot is (width * stack) = 6 *
As a result, a cassette coil having 6 aligned arrangements and portions arranged in slots (alignment length * overlap) = 18 * 2 is obtained. In this way, by stacking the cassette coil pieces to form a cassette coil, even in the case of a cassette coil having a large number of turns, the alignment arrangement can be converted between the portion crossing the slot and the portion arranged in the slot under predetermined conditions. Easy to do. As described above, by using the cassette coil according to the present invention, it is possible to reduce the volume of the portion that crosses the slot, facilitate the downsizing of the motor, realize the aligned winding in the slot, and increase the occupancy rate of the coil in the slot. It is possible to easily improve the output of the motor.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. For convenience of explanation, in a three-phase excitation distributed winding motor, 16 slots are provided in the stator for each excitation phase, for a total of 48 slots, and the number of windings of the coil of each excitation phase is 36. The same can be applied to other excitation phase numbers, slot numbers, and coil winding numbers.

FIG. 1 shows how a two-slot cassette coil 3 is arranged in a stator assembly 1 of a distributed winding motor. The two-slot cassette coil 3 is formed by winding 36 coil wires over two slots so as to be integrated. To arrange the two-slot cassette coils 3 in 16 slots of each excitation phase, the two-slot cassette coil 3 is combined. Use 8 pieces. A rectangular wire having a rectangular cross section can be used as the coil wire. A coil wire having a circular cross section can be wound while being fixed by adhesion or the like.

FIG. 2 shows that the stator has 48 slots.
It is an explanatory view of a situation where a cassette coil of each excitation phase is arranged. For example, the U-phase cassette coil 5 is continuously arranged in slot numbers 1, 2, 7, 8, 13, 14, and the like.
Similarly, the V-phase cassette coil 7 has slot numbers 3,
4, 9, 10, 15, 16 and the like are continuously arranged, and the W-phase cassette coil 9 has slot numbers 5, 6, 11, 1.
2, 17, 18 and the like are continuously arranged. The U-phase cassette coil coil 5, the V-phase cassette coil coil 7, and the W-phase cassette coil 9 can be obtained by sequentially connecting the two-slot cassette coils 3 described in FIG. 1 by welding or the like. Alternatively, 36 coil wires may be continuously arranged over 16 slots without using welding or the like to obtain an integrated cassette coil for all slots.

The cassette coil of each excitation phase in FIG. 2 has a repetition, and for example, the U-phase cassette coil 5 is
Two-slot cassette coil 1 in which 36 coil wires are continuously arranged across slot number 2 and slot number 7.
Eight pieces are repeated with the cassette coil for two slots having the same structure as that of No. 1 as a unit. FIG. 3 is a diagram for explaining the relationship between the two-slot cassette coil 11 and the cassette coil element 13, and the arrangement state in the slot portion and the transition portion. FIG. 3A shows a perspective view of the two-slot cassette coil 11. In this way, the six layers of cassette pieces 13 are aligned and stacked to form one 2-slot cassette coil 11. Each cassette coil piece 1
The coil coil 3 has six coil wires aligned with each other, and the two-slot cassette coil 11 has a total of 36 coil wires wound.

FIG. 3B is a plan view showing how the two-slot cassette coil 11 is arranged in the two slots 15 and 17. One cassette coil piece is shown as a line in the diagram. Two slots 15,1
7 corresponds to slot number 2 and slot number 7 in FIG. The two-slot cassette coil 11 includes a connecting portion 19 that crosses the two slots 15 and 17, and the slots 15 and 1.
7 has a slot portion 21 arranged therein. Crossing part 1
In No. 9, six layers of cassette coil pieces are arranged in parallel with each other in the crossing direction, and each of the cassette coil pieces has six coil wires aligned in the direction perpendicular to the plane of the drawing and is wound in layers. Therefore, the width of the transition portion 19 of the entire 2-slot cassette coil 11 is 6 times the thickness of the cassette coil piece. And (width * overlap) = 6 * 6 is aligned and overlaid.

On the other hand, the slot portion 21 is aligned with the slots 15 and 17 at twice the thickness of the cassette coil piece and is arranged perpendicularly to the paper surface. The alignment length is (6 *
6) / 2 = 18, the thickness of the cassette coil piece is 18
Doubled. In other words, (alignment length * overlap) = 18 * 2 are arranged. That is, in each cassette coil piece, the number of layers is changed in multiple layers when the aligned lap winding moves from the crossover portion 19 to the slot portion, and each cassette coil piece is converted into a 3 * 2 aligned arrangement, Six of them will be placed.

In such a structure, the aligned length L1 of the coil in the slot portion is 18 * (thickness of the flat coil wire), while the width L2 of the crossover portion is 6 * (thickness of the flat coil wire). Is the same as the number of excitation phases N. Therefore, all the transition parts of the excitation phase can be arranged within the dimension of the coil alignment length L1. As a result, the volume of the portion that crosses the slot is reduced to facilitate downsizing of the motor,
It is possible to realize the aligned winding in the slot, increase the coil occupation ratio in the slot, and easily improve the output of the motor.

A method of manufacturing the cassette coil for the distributed winding motor having the above construction will be described in accordance with the flow chart of FIG. 4 with reference to the process explanatory diagrams of FIGS. For convenience of explanation, a method for manufacturing a two-slot cassette coil will be described, but the present invention can be similarly applied to an integrated all-slot cassette coil. In the flowchart of FIG. 4, the one-layer aligned winding step of S1 and the multi-layer conversion step of S3 are
It is a step of forming a cassette coil piece by using six coil wires. Next, 6 cassette coil pieces are provided in the cassette coil piece providing step of S5, and in the steps after the overlapping step of S7, the 6 cassette coil pieces are overlapped and molded, and heat fusion is performed. They are integrated to form one 2-slot cassette coil composed of 36 coil wires.

S1 is a single-layer winding process, which corresponds to the positional relationship between the two slots and forms a slot portion to be placed in the slot and a crossover portion that crosses the two slots, while forming six coils in one layer. It is a step of winding the wires in an aligned manner.

FIG. 5 is a plan view of the single-layer aligned winding coil 31. The winding method of the coil is arranged in the slot part for the slot height which is substantially the same as the height of the stator, and from there, it is arranged in the next slot part through the transition part for the distance between the two slots and then again. After passing through the part, it returns to the original slot part and becomes one turn. Therefore, the coil winding jig having the wall portion having the length corresponding to the height of the slot and the wall portion having the length corresponding to the distance between the two slots is wound once while aligning the six rectangular wires. As a result, the further aligned winding coil 31 can be obtained.

FIG. 6 further illustrates such a single layered winding 6
It is a figure which shows the case where the jig which performs a layer continuous is used. Figure 6
In the above, using the uppermost part of the jig having a 6-layer structure, six rectangular wires are aligned and wound once to obtain a single-layer aligned coil 33 of the first layer, and from the end of the winding, the jig is wound. The second-layer single-layer aligned-winding coil 35 is obtained by using the second-stage portion, and similarly, the third-layer, fourth-layer, fifth-layer, and sixth-layer single-layer aligned-winding coils 37, 39, It can be obtained as a continuous integral structure with 41 and 43.

Step S3 is a step of converting the slot portion of the single-layer aligned winding coil obtained in S1 from the single-layer aligned lap winding to the multilayer aligned lap winding in the multilayer conversion step to obtain a cassette coil piece. The total number of layers is the number N of distributed winding motor phases. That is, in the case of three-phase excitation, what has been wound in six layers one by one is converted into a three-layer aligned winding in which the slot portion is wound.

FIG. 7 is a view showing the concept of a jig used for multi-layer conversion. The jig is provided with two conversion groove portions 45 provided at an interval corresponding to the distance between the two slots. The conversion groove portion 45 has a wide-mouthed opening portion in the lower portion, and has a tapered shape in which the opening portion becomes narrower toward the upper portion,
It has a groove width corresponding to the book stack. Single layer winding coil 47
Is received as it is in the wide-mouth opening, but is pushed up to the upper part of the jig along the tapered part by a push-up part (not shown), and follows the tapered jig inner wall, and its shape State 49, and 2 more
It is pushed up to the groove width portion of the double stack and converted into a cassette coil piece 51 of double stack and three layers.

FIG. 8 is a view showing a state in which a single-layer aligned winding coil is set on a concrete multi-layer conversion jig 53 and the multi-layer conversion is sequentially performed. The portion of the conversion groove is similar to that shown in FIG. Using this multi-layer conversion jig 53, it is possible to efficiently perform a multi-layer conversion of a single single-layer aligned winding coil, and to apply a coil of a continuous integrated structure in which the single-layer aligned winding shown in FIG. 6 is continuously performed for six layers. You can also do it. In that case, as shown in FIG. 8, the first layer portion 55 is first subjected to multi-layer conversion, and then the second layer portion 5
7, the third layer portion 59, and the fourth layer portion 61 can be sequentially multilayer-converted, and a multilayer-converted cassette coil piece for 6 layers can be obtained in a continuous form.

S5 is a cassette coil piece providing step,
This is a step of preparing and providing six multilayer-converted cassette coil pieces. As will be described later in detail, the six multi-layer converted coils have overlapping shapes, and thus their individual shapes are slightly different. Therefore, it is necessary to wind in a shape corresponding to the six types of cassette coil pieces in the single-layer aligned winding step of S1. Further, in the case of the continuous integrated cassette coil piece of FIG. 6, it is necessary to wind each layer in a slightly different predetermined shape. When preparing six single-layer cassette coil pieces for one layer, it is necessary to electrically connect the six single-piece cassette coil pieces to each other.

Step S7 is a stacking step in which six multilayer converted cassette coil pieces are stacked with their slot portions and crossover portions aligned and set in a molding die. FIG. 9 shows a cassette coil element 65 in a molding die 63.
It is a figure which shows a mode that 6 pieces are piled up and set. The molding die 63 includes a base 67, a slide die 69, and an upper and lower die 71.

In step S9, a molding die is used to mold the stacked cassette coil pieces into a predetermined shape. FIG. 10 shows that, in the molding die 63, with respect to the stacked cassette coil pieces, the slide die 69 defines the plane size, the upper and lower dies 71 define the stacking direction, and the die is molded into a predetermined shape by pressure molding. It is shown that the cassette coil element 73 is formed.

Step S11 is a heat fusion step, in which pressure is continued after the molding is completed, and the molding die is heated while maintaining the molding shape, and the cassette coil pieces are mutually fused by pressure heating. It is the process of wearing. That is, by using the self-bonding wire in which the coil wire is coated with the heat-fusible material, the 36 coil wires are fused to each other by this pressure heating.

Step S13 is a take-out step, in which the cassette coil pieces are sufficiently fused to each other by heat fusion, and then the molding die is cooled to firmly fuse the six cassette coil pieces from the die. This is the step of taking out the integrated cassette coil.

FIG. 11 shows the completed 2-slot cassette coil 75. 2-slot cassette coil 75
Is a crossover 77 that corresponds to the crossing of two slots.
And a slot portion 79 corresponding to the portion arranged in the slot. FIG. 12 (a) shows a cross section of the crossover, FIG.
2 (b) shows a cross section of the slot portion. The transition part is
6 layers of (1 * 6) are fused, and (width * overlap) = (6 * 6) are arranged in an array. At the slot portion, 6 layers of (3 * 2) are fused and * Overlap == (18 * 2).

The two-slot cassette coils thus obtained can be continuously connected by welding or the like to form all-slot cassette coils for each excitation phase of the motor. It is also possible to obtain an integrated cassette coil for all slots, which is arranged over 16 slots without using welding or the like.

[0037]

The distributed winding motor, the cassette coil, the method for manufacturing the cassette coil piece, and the method for manufacturing the cassette coil according to the present invention facilitate the downsizing of the motor by reducing the volume of the portion across the slot. By arranging windings in the inside, the occupancy ratio of the coil in the slot is increased and the output of the motor is easily improved.

[Brief description of drawings]

FIG. 1 shows how a cassette coil is arranged in a stator assembly of a distributed winding motor according to an embodiment of the present invention.

FIG. 2 shows a stator 48 according to an embodiment of the invention.
It is an explanatory view of a situation where a cassette coil of each excitation phase is arranged in each slot.

FIG. 3A is a perspective view of a two-slot cassette coil according to an embodiment of the present invention, and FIG.
FIG. 7B is a plan view when it is arranged in the slot.

FIG. 4 is a flowchart of a method for manufacturing a 2-slot cassette coil according to the embodiment of the present invention.

FIG. 5 is a plan view of a single-layer aligned winding coil according to the embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a case where a jig for performing one-layer aligned winding in six consecutive layers is used according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing the concept of a jig used for multi-layer conversion according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a manner in which a single-layer aligned winding coil is set on a multilayer conversion jig and sequentially subjected to multilayer conversion according to the embodiment of the present invention.

FIG. 9 is a cross-sectional view showing how six cassette coil pieces are stacked and set in a molding die according to the embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a state where the stacked cassette coil pieces are molded into a predetermined shape by the molding die according to the embodiment of the present invention.

FIG. 11 is a perspective view of the completed 2-slot cassette coil according to the embodiment of the present invention.

12 (a) is a cross-sectional view of a transition portion of a cassette coil according to the embodiment of the present invention, FIG. 12 (b).
[FIG. 7] is a sectional view of a slot portion.

[Explanation of symbols]

1 stator assembly, 3,11,75 two-slot cassette coil, 5 U-phase cassette coil, 7 V-phase cassette coil, 9 W-phase cassette coil, 13,65 cassette element, 15,17 slot, 19,77 crossover Part, 21,79 slot part, 31,33,35,
37, 39, 41, 43, 47 Single layer winding coil, 4
5 conversion groove part, 49 umbrella shape, 51 two-layer three-layer cassette coil element, 53 multilayer conversion jig, 55 first layer, 57 second layer, 59 third layer, 61 fourth layer Min, 63 mold, 67 base, 69 slide mold, 71 upper and lower molds, 73 molded cassette coil pieces.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Atsushi Watanabe             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 5H603 AA09 BB01 BB07 BB12 CA01                       CA05 CB02 CB03 CB22 CC03                       CC17 CD05 CD21 CD22 CD24                       CE02 EE01 FA18                 5H604 BB01 BB08 BB14 CC01 CC05                       CC13 DB19 PB01 PB02 PB03                 5H615 AA01 BB01 BB05 BB14 PP12                       QQ03 QQ12 QQ19 QQ27 SS03                       SS04 SS05 SS11 SS13 SS18                       SS24

Claims (4)

[Claims] 1. A distributed winding motor in which a plurality of coil wires are continuously arranged in each slot corresponding to each excitation phase of an N-phase excitation motor, wherein the plurality of coil wires are arranged in alignment. A distributed winding motor, wherein L2 is approximately L1 / N or less, where L1 is the aligned length of the coil in the portion housed in the slot and L2 is the width of the coil in the portion that crosses the slot. 2. A cassette coil in which a plurality of coil wires are continuously arranged in at least two slots of slots corresponding to each excitation phase of an N-phase excitation motor, wherein the plurality of coil wires are aligned. A cassette coil, wherein L2 is approximately L1 / N or less, where L1 is an aligned length of a coil of a portion arranged and accommodated in the slot, and L2 is a width of a coil of a portion that crosses the slot. 3. A method for manufacturing a cassette coil piece, wherein a plurality of coil wires are continuously arranged in at least two slots of slots corresponding to each excitation phase of an N-phase excitation motor, wherein the plurality of coils are provided. A single-alignment winding step of aligning and winding the wire in a single layer while forming a slot portion arranged in the slot and a transition portion crossing the two slots, corresponding to the arrangement relationship of the two slots. And a multilayer conversion step of converting the slot portion of the plurality of coil wires wound in one-layer aligned and stacked winding from the one-layer aligned and stacked winding into a multi-layer aligned and stacked winding. 4. A method of manufacturing a cassette coil, wherein a plurality of coil wires having a heat-meltable insulating film are continuously arranged in at least two slots corresponding to each excitation phase of an N-phase excitation motor. A plurality of coil wires, which correspond to the arrangement relationship between the two slots and form a slot portion to be arranged in the slot and a crossover portion that crosses the two slots, and are aligned and overlapped. A cassette coil piece forming step of forming a cassette coil piece by converting the slot portion of the plurality of coil wires wound in the one-layer-aligned-lapped winding into the multilayer-aligned-lapped winding, The cassette coil pieces are laid one on top of the other with the slots and crossovers aligned, and heat is applied to melt the heat-melting insulation film and fuse the cassette coil pieces to each other. A heating step, wherein L1 is equal to or less than approximately L1 / N when the aligned length of the coil in the slot portion is L1 and the width of the coil in the crossover portion is L2 after heat fusion. Method for manufacturing cassette coil.