JP2004072824A - Stator for ac motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for an AC motor which can improve motor properties by elevating winding density. <P>SOLUTION: The stator for an AC motor is constituted of a divided iron core divided into a peripheral iron core 3, and a teeth part iron core 2. In the stator, winding is applied to the above teeth iron core 2. Two sets (A, B) of single-layered insulating sheathed wires with square cross section are wound from inside, and connected at the initial winding ends to form a basic coil. Further, a plurality of basic coils are stacked to form an expanding profile when going to the outer diameter of the motor. Consequently, the coil has a trapezordal form in cross section. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a so-called AC motor, and particularly to a stator structure thereof.
[0002]
[Prior art]
An AC motor used for industrial purposes includes a stator having a stator core and an armature winding, and a rotor having a permanent magnet. FIG. 12 is an example of a typical AC motor used for industry. 12, 1 is a stator core, 14 is a permanent magnet, 15 is a shaft , 17 is an armature winding, 18 is a tooth, and 19 is a slot. As shown in the figure, the stator core 1 is formed by laminating a number of thin plate materials such as silicon steel plates, and the inside of the stator is a radial tooth 18. Is equipped. A rotor having a permanent magnet 14 adhered to its surface is disposed in the stator. By passing a three-phase alternating current through the armature winding 17, a rotating magnetic field is generated, and the rotor is rotated.
In order to improve the motor characteristics, it is particularly effective to increase the winding density in the slot. In the conventional stator structure, it is necessary to perform the winding from the inside of the stator, and there is a limit in increasing the winding density.
In order to solve this problem, a method of dividing the stator core has been devised.
FIG. 13 shows an example. In FIG. 13, 1 is a stator core, 2 is a teeth core, and 3 is an outer peripheral core. As shown in FIG. 13, the stator core 1 has a two-part structure, and includes a radial teeth core 2 having an open portion on the outside and an outer peripheral core 3 fitted on the outside thereof.
FIG. 14 is an enlarged view of the winding part A of FIG. 14, reference numeral 2 denotes a teeth core, 3 denotes an outer peripheral core, 13 denotes a round wire coil, and 16 denotes a resin bobbin. In the figure, the winding is wound neatly on a bobbin 16 made of resin, which also serves as an insulator, in such a manner that a round insulated wire is fitted to the shape of the slot.
After the winding is wound, it is mounted from the outside of the radial teeth core 2. After all the windings are mounted, the stator 3 is formed by fitting the outer peripheral core 3.
[0003]
[Problems to be solved by the invention]
The stator of the AC motor according to the prior art having the split iron core structure described above achieves a remarkable winding density as compared with the stator of the AC motor having the integrated iron core. There is a need to further improve the winding density. However, in the prior art, a round wire is used, so that a gap always occurs between adjacent wires, and there is a limit in increasing the winding density.
Further, in the prior art, a continuous wire is used from the beginning to the end of the winding, and the wires are wound while intersecting from the inner layer side to the outer layer side, and in the aligned winding, the winding in each layer is Even when the layers were neatly aligned, some of the layers had intersections on which the next layer could ride. At the intersection where the wires intersect, a bulge occurs in the coil, and the bulge results in disturbance of the winding layer, resulting in a reduction in the winding density.
Also, in the prior art, since a continuous wire is used from the beginning to the end of the winding, the beginning of the winding is naturally inside the coil, so extra space is required to pull out the beginning of the winding, which is dead space. This was a factor in lowering the winding density.
Accordingly, an object of the present invention is to solve the above-mentioned disadvantages and to provide an AC motor stator having an extremely high winding density.
[0004]
[Means for Solving the Problems]
In order to solve the above problem, the invention of an AC motor stator according to claim 1 is configured by a divided core divided into an outer peripheral core and a teeth core, and the teeth core is wound. In the stator of the AC motor, the winding is basically formed by connecting insulated wires each having a rectangular cross-section and winding the inner portion of the insulated wire to form a pair, and connecting the respective winding start portions. It is characterized in that the coil is formed of a trapezoidal coil by superimposing a plurality of coils whose outer diameter becomes larger toward the outer diameter of the motor.
According to the above-described configuration, the winding density can be improved without generating the disturbance of the winding layer generated when the winding is wound many times, so that the motor characteristics can be improved.
In addition, because the insulated wire with a rectangular cross section is layered in two layers, and the basic coil is connected to the inner winding start part, both coil ends are outside the coil. Since it is protruding, it is possible to completely eliminate dead space for pulling out the winding start portion.
Further, since the windings are wound at a high density, the thermal conductivity is improved. As a result, when the same output as that of the motor according to the related art is generated, the temperature rise of the motor can be suppressed low.
When the temperature rise is made equal, the size can be reduced as compared with the conventional motor.
According to a second aspect of the present invention, in the stator of the AC motor according to the first aspect, the plurality of basic coils are connected in series.
According to the above configuration, since the basic coils are connected in series, the number of turns per coil is increased, and a motor suitable for a high-voltage / low-current power supply device can be obtained.
According to a third aspect of the present invention, in the stator for an AC motor according to the first aspect, the basic coils are connected in parallel with the same number of turns of the plurality of basic coils.
According to the above configuration, since the basic coils having the same number of turns of the basic coil are connected in parallel, the number of turns per coil can be reduced, and the electric resistance of the winding can be reduced. Therefore, a motor suitable for a low-voltage / high-current power supply device can be obtained.
According to a fourth aspect of the present invention, in the stator for an AC motor according to the second or third aspect, a printed circuit board is used when the plurality of basic coils are connected to each other.
According to the above configuration, since the printed circuit board is used when connecting the basic coils, the connection between the basic coils can be simply and firmly connected, so that a connection failure of the coil connection portion can be prevented. .
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of an AC motor according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a stator of an AC motor according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A in FIG.
In FIG. 1, reference numeral 1 denotes a stator core, 2 denotes a teeth core, and 3 denotes an outer peripheral core. 9 is a basic coil. As shown in FIG. 1, the stator core 1 also has a two-part structure, and includes a radial teeth core 2 having an open portion on the outside and an outer peripheral core 3 fitted to the outside thereof. 2, reference numeral 2 denotes a teeth core, 3 denotes an outer peripheral core, 9 denotes a basic coil according to the present invention, and 16 denotes a resin bobbin.
Next, the configuration of the basic coil 9 will be described.
3 and 4 are perspective views showing the single-layer wrapped coils constituting the basic coil. FIG. 5 is a perspective view showing a basic coil formed by superposing the single-layer wound coils of FIGS. 3 and 4 respectively.
In FIG. 3, reference numeral 4 denotes a single-layer wound coil, 6 denotes the start of winding, and 7 denotes the end of winding. In FIG. 4, reference numeral 5 denotes a single-layer wound coil paired with the single-layer wound coil 4 of FIG. 9 is a basic coil. As shown in Fig. 3, a flat wire in which a rectangular insulated wire is simply layered and wound in a single layer is a single layer winding, so there is no intersection of the windings and there is almost no gap between the coils. Can be.
In the same manner as in FIG. 3, a single layered winding of a flat wire wound in the direction opposite to that of FIG. 4 is produced. In FIG. 5, the single-layer coils 4 and 5 are overlapped and fixed, and the winding start inside the coil is connected to each other by the connecting portion 8 to form the basic coil 9.
Here, the single-layer coils 4 and 5 are wound in opposite winding directions, but as basic coils, coils having the same winding direction are overlapped.
As described above, a basic coil having both coil ends protruding outside can be configured. The connection between the winding starts is made by, for example, soldering, and after the soldering, it is necessary to cover the connecting portion with an insulating tube or the like for insulation.
It is desirable that the connecting portion 8 be as small as possible so as not to be obstructed when being inserted into the teeth core. It should be noted that instead of using two single-layer wound coils as described above and connecting the insides of the windings to each other, starting winding from the center of the coil and performing a connection process without performing a connection process, the same product as the basic coil described above. Of course, it can be obtained.
[0006]
FIG. 6 is a perspective view showing a state where the basic coils are stacked. 7 and 8 are cross-sectional views of FIG. 6, wherein FIG. 7 is a longitudinal sectional view of the stacked basic coil of FIG. 6 in the narrow direction, and FIG. 8 is a longitudinal sectional view of the stacked basic coil of FIG. It is. In the drawing, reference numerals 91 to 94 denote respective basic coils whose outer dimensions are sequentially reduced from the maximum to the minimum. By stacking a plurality of coils each having a gradually different outer dimension, a coil having a trapezoidal cross-sectional shape is formed. Obtainable.
As shown in FIG. 1, since the space in which the coil can be stored in the slot is trapezoidal, if a trapezoidal coil formed by stacking the above basic coils is mounted, the coil space factor in the slot is improved. be able to.
As described above, the coil formed by the present invention has substantially no gap between adjacent wires, and thus can greatly increase the winding density, as compared with a coil formed by a conventional round wire.
Regarding the insulation between the trapezoidal coil and the iron core, for example, a method of inserting insulating paper into the gap between the trapezoidal coil and the iron core, or before mounting the trapezoidal coil on a resin bobbin made of insulating resin, There is a method to attach to the iron core. 1 and 2 show an embodiment in which a resin bobbin is used.
[0007]
FIG. 9 is a diagram showing a configuration in which basic coils are connected in series.
In the figure, reference numeral 2 denotes a teeth core, 8 denotes a series connection part connecting the end of each basic coil and the start of the next basic coil, and 10 denotes a coil end. By connecting in series in this manner, the number of turns of the entire coil is increased, and a motor suitable for a high-voltage / low-current power supply device can be obtained.
FIG. 10 is a diagram showing a configuration in which basic coils are connected in parallel.
In the figure, reference numeral 2 denotes a teeth core, 8 'denotes a parallel connection portion formed by connecting the start ends of the basic coils and the end ends thereof, and 10 denotes a coil end. By connecting in parallel in this manner, the number of turns per coil can be reduced, and the electric resistance of the windings can be reduced, so that a motor suitable for a low-voltage, large-current power supply device can be provided. it can.
FIG. 11 shows an example in which the series connection of FIG. 9 is connected to the end of the basic coil and the start of the next basic coil using a printed circuit board. FIG. 11A is a perspective view of the printed circuit board on the land side, and FIG. (A) is a front view in which the printed circuit board is attached to the coil, and (c) is a side view of (b).
2A, reference numeral 11 denotes a printed circuit board made of an insulating substrate, which has substantially the same shape as the trapezoidal coil laminated by the basic coil 9 in FIG.
With the printed board 11 attached, a notch 11a is provided at the position of the printed board 11 corresponding to the position of the coil end of each basic coil 9, and a copper foil pattern 12 is used to connect the notch 11a to the adjacent notch 11a on the opposite side of the trapezoid. Each forms a land.
3B shows a state in which the printed circuit board 11 is attached to the basic coil 9 and the corresponding coil ends 10 are accommodated in the respective notches 11a. Thereafter, the coil ends 10 may be soldered to the lands of each copper foil pattern 12 (the soldering is not shown in the figure to make the copper foil patterns 12 and the coil ends 10 look easy to understand).
2C, reference numeral 2 denotes a teeth core, 3 denotes an outer peripheral core, 9 denotes a basic coil, 10 denotes a coil end, 11 denotes a printed circuit board, and 16 denotes a resin bobbin. Here, the printed circuit board 11 is fixed to the resin bobbin 16. Each coil end 10 housed in the notch 11a is soldered to each land with solder 11b. Thereby, a series connection of each basic coil 9 is obtained.
As described above, since the printed circuit board 11 is used to connect the basic coils 9 to each other, the connection between the basic coils 9 can be simply and firmly connected. Can be prevented.
Although FIG. 11 shows only an embodiment applied to series connection, it is obvious that the embodiment can be applied to parallel connection.
It should be noted that the stator of the AC motor of the present invention is not limited to a so-called synchronous AC motor, but can be applied to all AC motors using a rotating magnetic field, including induction and reluctance types.
[0008]
【The invention's effect】
As described above, according to the stator of the AC motor according to the first aspect, the winding density can be improved without the occurrence of disturbance of the winding layer generated when winding the winding many times, so that the motor characteristics can be improved. Can be improved.
In addition, because the insulated wire with a rectangular cross section is layered in two layers, and the basic coil is connected to the inner winding start part, both coil ends are outside the coil. Since it is protruding, it is possible to completely eliminate dead space for drawing out the winding start portion.
Further, since the windings are wound at a high density, the thermal conductivity is improved. As a result, when the same output as that of the motor according to the related art is generated, the temperature rise of the motor can be suppressed low. Further, when the temperature rise is made equal, the size can be reduced as compared with the motor according to the related art.
According to the AC motor stator of the second aspect, since the basic coils are connected in series, the number of turns per coil is increased, and the motor suitable for a high-voltage and low-current power supply device can be obtained. .
According to the AC motor stator according to the third aspect, since the basic coils having the same number of turns of the basic coil are connected in parallel, the number of turns per coil can be reduced. Since the electric resistance of the motor can be reduced, a motor suitable for a low-voltage / high-current power supply device can be obtained.
According to the AC motor stator of the fourth aspect, since the printed circuit board is used to connect the basic coils, the connection between the basic coils can be simply and firmly connected. Failure can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a perspective view of a single-layered coil A (left-handed).
FIG. 4 is a perspective view of a single-layer wound coil B (right-handed winding).
FIG. 5 is a perspective view of a basic coil formed by superposing the coils A and B of FIGS. 3 and 4;
FIG. 6 is a perspective view of a state in which a plurality of basic coils of FIG. 5 having different sizes are stacked.
FIG. 7 is a longitudinal sectional view of the stacked basic coils of FIG. 6 in a narrow width direction.
FIG. 8 is a longitudinal sectional view of the stacked basic coils of FIG. 6 in a wide direction.
FIG. 9 is a front view showing a state in which stacked basic coils are connected in series.
FIG. 10 is a front view showing a state in which stacked basic coils are connected in parallel.
11A and 11B are examples in which the series connection of FIG. 9 is performed using a printed circuit board, where FIG. 11A is a perspective view of the printed circuit board on the land side, FIG. 11B is a front view in which the printed circuit board of FIG. (C) is a side view of (b).
FIG. 12 is a cross-sectional view showing an example of a conventional AC motor.
FIG. 13 is a cross-sectional view showing an example of a conventional AC motor different from FIG.
FIG. 14 is an enlarged view of a portion A in FIG.
[Explanation of symbols]
1: Stator core 2: Teeth core 3: Peripheral core 4: Single layer coil A
5: Single layer coil B
6: Winding start 7: Winding end 8: Connection part 9: Basic coil 10: Coil end 11: Printed circuit board 11a Notch 11b Solder part 12: Copper foil pattern 13: Round wire coil 14: Permanent magnet 15: Shaft 16: Resin Bobbin 17: Armature winding 18: Teeth 19: Slots 91, 92, 93, 94 Basic coil

Claims (4)

In the stator of the AC motor, which is constituted by a divided core divided into an outer peripheral core and a teeth core, and the teeth core is wound.
The winding is a set of two insulated wires each having a rectangular cross section and one layer of which is wound around the inside, starting from the inside, and each winding start portion is connected as a basic coil. A stator for an AC motor, comprising a plurality of coils having a trapezoidal cross section formed by superimposing a plurality of coils having a larger diameter toward the outer diameter of the motor. 2. The AC motor stator according to claim 1, wherein the plurality of basic coils are connected in series. 2. The stator for an AC motor according to claim 1, wherein said plurality of basic coils are wound in the same number of turns and the basic coils are connected in parallel. 4. The AC motor stator according to claim 2, wherein a printed circuit board is used when connecting the plurality of basic coils.

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