JP2002305849A - Motor, connection method of its phase coil, coil for motor, and winding bundle forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized motor, and reduce eddy-current loss of a coil. SOLUTION: Rectangular coils 24, 26 and trapezoid coils 34, 36 each equivalent to a one-phase coil are connected in series respectively, and the respective coil groups connected in series are connected in parallel. It is possible to provide the small-sized motor by using the coils in different forms. When the rectangular coil 24 and the rectangular coil 26, the trapezoid coil 34 and the trapezoid coil 36 are formed so as to be equal in value, the four coil groups connected in series become equal in value. Therefore, low motor efficiency caused by connecting the coil groups with various impedance in parallel can be restrained. The number of parallels can be increased, thus it is possible to reduce the eddy-current loss of the coil by minimizing the cross section of the winding of the respective coils.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, a method of connecting phase coils thereof, a motor coil, and a method of forming a winding bundle.

[0002]

2. Description of the Related Art Conventionally, as this type of motor, a motor using a rectangular coil and a trapezoidal coil for the purpose of reducing the size of the motor has been proposed (see, for example, Japanese Patent Laid-Open No.
No. 174331). In this motor, a rectangular coil and a trapezoidal coil are alternately attached to the teeth of the stator, and the rectangular coil and the trapezoidal coil are connected in series to form one phase.

In order to reduce the eddy current loss of a coil of a motor, a motor in which a plurality of coils are connected in parallel has been proposed (for example, Japanese Patent Application Laid-Open No. 10-201157). The parallel connection of the coils is based on the fact that the eddy current loss to be connected becomes smaller as the winding width is smaller when the winding is viewed from the direction of the magnetic flux.

[0004]

However, in a motor in which a rectangular coil and a trapezoidal coil are connected in series, it is difficult to reduce the eddy current loss even though the size of the motor can be reduced. On the other hand, in an electric motor in which coils are connected in parallel, it is difficult to reduce the size of the motor even if the eddy current loss can be reduced. If the above two techniques are combined, it is possible to consider a parallel connection of a rectangular coil and a trapezoidal coil,
Because rectangular and trapezoidal coils are not equivalent,
The impedance will be different, and the motor efficiency will be reduced.

An object of the present invention is to reduce the size of the motor and reduce the eddy current loss of the coil by connecting the phase coil to the motor. Another object of the present invention is to improve the efficiency of the electric motor and the method of connecting the phase coils thereof. An object of the motor coil of the present invention is to reduce eddy current loss. Another object of the present invention is to improve the efficiency of a motor.

[0006]

Means for Solving the Problems and Actions and Effects Thereof The motor, the method of connecting phase coils thereof and the coil for the motor according to the present invention employ the following means in order to achieve at least a part of the above object.

The gist of the present invention is to provide a motor having a plurality of phase coils formed by connecting a plurality of series-connected coil groups formed by connecting a plurality of coils having different shapes in series to each other in parallel.

In the electric motor of the present invention, a plurality of series-connected coils formed by connecting a plurality of coils having different shapes in series are connected in parallel, that is, the series-connected coils having the same impedance are connected in parallel. , The eddy current loss can be reduced, and the efficiency of the electric motor can be further improved.

In the electric motor of the present invention, the series connection coil group may be formed by connecting a rectangular coil and a trapezoidal coil in series.

Further, in the electric motor according to the present invention, the plurality of coils having different shapes are wound by a winding bundle in which a plurality of windings are bundled, and the series-connected coil group constitutes the winding bundle of each coil. Each winding may be connected in series. With this configuration, the coils wound by the winding bundle are connected in parallel by the number of windings, so that the eddy current loss can be further reduced.

[0011] In the electric motor according to the present invention, the winding bundle is provided with a coil formed by winding the winding bundle, and the winding bundle is bundled in a line so that a side surface perpendicular to a longitudinal direction of a cross section of the winding is in contact with the winding. You can also. In the electric motor according to the aspect of the present invention, the plurality of coils having different shapes may be arranged and wound by a winding bundle in which windings are bundled in a row in a direction parallel to the axis of the coil.

[0012] Further, in the electric motor of the present invention in an aspect including a coil formed by winding a winding bundle in which windings are bundled in a line,
The winding may have a length in the longitudinal direction with respect to the length in a direction perpendicular to the longitudinal direction of the cross section being approximately 1.5. In this way, it is possible to prevent the winding from being twisted when forming the coil.

[0013] In the electric motor according to the aspect of the present invention having a coil formed by winding a winding bundle, the winding bundle may be bundled in a row so that side surfaces parallel to a longitudinal direction of a cross section of the winding are in contact with each other. it can. In the electric motor according to the aspect of the present invention, the windings may be bundled so that the length in the column direction for binding the windings is longer than the length in the longitudinal direction of the windings.

Further, in the electric motor according to the present invention, wherein the plurality of coils of different shapes are provided with a coil formed by winding a bundle of windings in a row so that side surfaces parallel to the longitudinal direction of the cross section of the winding contact with each other. Alternatively, the windings may be arranged and wound by a winding bundle in which the windings are bundled in a line in a direction parallel to the winding axis of the coil.

The method for connecting phase coils of a motor according to the present invention is as follows.
The gist of the present invention is to connect a plurality of coils having different shapes in series and to connect a plurality of series-connected coil groups formed by the series connection in parallel.

According to the method of connecting phase coils of a motor according to the present invention, a plurality of coils having different shapes are connected in series and a plurality of series-connected coil groups formed in series are connected in parallel, that is, the same impedance is set. By connecting the series connection coil groups in parallel, it is possible to reduce the size of the motor, reduce eddy current loss, and further improve the efficiency of the motor.

The first motor coil of the present invention is formed by winding a plurality of windings in a row so as to be in contact with a side surface perpendicular to the longitudinal direction of the cross section of the windings. And

In the first motor coil of the present invention,
Since the number of windings constituting the winding bundle can be connected in parallel, eddy current loss can be reduced.

In the first motor coil of the present invention, the winding bundle may be formed by bundling a plurality of windings in a row in a direction parallel to the winding axis of the coil.

In the first motor coil of the present invention, the length of the winding in the longitudinal direction with respect to the length in the direction perpendicular to the longitudinal direction of the cross section may be approximately 1.5. it can.

[0021] The second motor coil of the present invention is characterized in that a plurality of windings are aligned and wound in a row so that a side surface parallel to a longitudinal direction of a cross section of the windings is in contact with each other. .

In the second motor coil of the present invention,
Since the number of windings constituting the winding bundle can be connected in parallel, eddy current loss can be reduced.

In the second electric motor coil of the present invention, the coils may be bundled such that the length in the column direction for binding the windings is longer than the length in the longitudinal direction of the windings.

In the second motor coil of the present invention, a plurality of windings may be bundled in a line in a direction parallel to the winding axis of the coil.

A winding bundle forming method according to the present invention is a winding bundle forming method for forming a winding bundle by bundling a plurality of windings, comprising: an aligning step of aligning the plurality of windings in a line; And a cooling step of cooling the winding bundle formed by the heating by bonding the windings by heating to form a winding bundle.

In the winding bundle forming method of the present invention, since the winding bundle formed in the heating step is cooled in the cooling step, the subsequent processing can be speeded up, and the working efficiency can be further improved.

The winding bundle forming method of the present invention may include a winding step of winding the winding bundle cooled in the cooling step around a winding frame. This way,
The coil can be produced smoothly.

Further, the winding bundle forming method of the present invention may include a forming step of forming the winding bundle formed in the heating step into a predetermined shape before cooling in the cooling step. In this case, the winding bundle can be more uniformly formed.

[0029]

Next, embodiments of the present invention will be described with reference to examples. FIG. 1 is an explanatory diagram showing a connection structure of a coil for one phase of an electric motor according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a state where the rectangular wound coil 22 and the trapezoidal wound coil 32 are attached to the teeth 42 of the stator 40 of the electric motor according to the embodiment.

The coil for one phase of the motor of the embodiment is shown in FIG.
As shown in the figure, the rectangular coils 24 and 26 and the trapezoidal coil 3
4 and 36 are connected in series, and the coil groups connected in series are connected in parallel. In the embodiment, since the design number of turns for one phase is 96 turns, each of the eight coils is formed by 48 turns.

The rectangular coil 24 and the rectangular coil 26, and the trapezoidal coil 34 and the trapezoidal coil 36 are equivalent to each other, that is, are formed so as to have substantially the same impedance, so that four series-connected coil groups are equivalent. It has the same impedance. In addition, by connecting such equivalent four series-connected coil groups in parallel, the cross section of the winding of each coil is reduced.

The rectangular coil 24 is formed by the winding 10a of the rectangular wound coil 22 shown in FIG. 2, and the rectangular coil 26 is formed by the winding 10b of the rectangular wound coil 22. That is, the rectangular coil 24 and the rectangular coil 26 are wound around the same tooth 42, and the two constitute the rectangular wound coil 22. The rectangular wound coil 22 is shown in FIG.
As shown in FIG. 3, the windings 10a and 10b are arranged in a line in the longitudinal direction, that is, the winding axis of the coil (teeth 4).
The winding bundles 11 are arranged and wound so as to be aligned in a longitudinal direction along the second axis). Therefore, since the rectangular coil 24 and the rectangular coil 26 are equivalent to the magnetic flux, the impedance is substantially equal. Here, in the winding bundle 11 of the embodiment, the ratio of the length in the longitudinal direction to the length perpendicular to the longitudinal direction of the cross section of both the windings 10a and 10b constituting the winding bundle 11 is 1.5. Formed. This is to prevent the windings 10a and 10b from being twisted when forming the rectangular wound coil 22. The windings 10a and 10b are bundled by, for example, heating and bonding an insulating film such as a resin formed on the outer surface of each of the windings 10a and 10b.

The trapezoidal coil 34 and the trapezoidal coil 36 are wound around the same teeth 42 by the windings 12a and 12b of the trapezoidal wound coil 32 shown in FIG. 2, similarly to the rectangular coils 24 and 26. The trapezoidal coil 34 and the trapezoidal coil 36 constitute a trapezoidal wound coil 32. Similarly to the rectangular wound coil 22, the trapezoidal wound coil 32 also arranges and winds the winding bundle 13 in which the windings 12a and 12b are arranged along the axis of the teeth 42 so that the longitudinal direction is aligned in a single line. It is formed. Accordingly, the trapezoidal coil 34 and the trapezoidal coil 36 are equivalent to the magnetic flux similarly to the rectangular coil 24 and the rectangular coil 26, and the impedances are substantially equal. The winding bundle 13 of the embodiment was the same as the winding bundle 11.

In the electric motor of the embodiment in which the coils for one phase are mounted, one phase is constituted by the two rectangular wound coils 22 and the two trapezoidal wound coils 32. The number is four.

According to the motor of the embodiment described above, the rectangular coils 24 and 26 and the trapezoidal coils 34 and 36 are connected in series, and the series-connected coils are connected in parallel to form a one-phase coil. By doing so, it is possible to reduce the size of the motor and reduce eddy current loss. Moreover, since the series-connected coil groups have substantially the same impedance, the efficiency of the motor does not decrease.

According to the motor of the embodiment, the winding 10
a and the winding 10b are arranged along the axis of the teeth 42 such that the longitudinal direction thereof is aligned in a line, and the bundle of windings 11 is aligned and wound, and the rectangular bundle winding coil 22 is wound. 12b is arranged along the axis of the teeth 42 such that the longitudinal direction thereof is aligned with one another, and the bundle 13 is aligned and wound, and the trapezoidal bundle coil 32 is wound to form the rectangular bundle coil 22. The trapezoidal coil 34 and the trapezoidal coil 36 constituting the rectangular coil 24 and the rectangular coil 26 and the trapezoidal wound coil 32 can have substantially the same impedance. As a result, the efficiency of the electric motor can be improved.

In the motor of the embodiment, two types of coils, a rectangular coil and a trapezoidal coil, are connected. However, three or more types of coils having different shapes may be connected. FIG. 3 shows an example in which n coils having different shapes are connected. As shown in the drawing, when n coils having different shapes are connected in series and m coils connected in series are connected in parallel, if the number of turns of a single-phase design coil is Nw, the number of turns of each coil is Nw / n may be used.

In the motor of the embodiment, the two windings 10a,
10b and the winding bundle 11 and the winding bundle 13 composed of the windings 12a and 12b are wound to form the rectangular winding coil 22 and the trapezoidal winding coil 32. Or a trapezoidal bundle wound coil may be formed, or may be formed by a single winding without using a winding bundle.

In the electric motor of the embodiment, the ratio of the length in the longitudinal direction to the length perpendicular to the longitudinal direction of the cross section is 1.5 for the windings 10a, 10b, 12a, 12b constituting the winding bundles 11, 13. Although a certain one was used, it is not limited to this, and the same ratio may be larger or smaller than 1.5.

In the motor of the embodiment, the winding 10a and the winding 1
0b (or the winding 12a and the winding 12b) are arranged and bundled so that the longitudinal direction is in a line, so that the winding bundle 1
Although the winding bundle 1 is formed (or the winding bundle 13), the winding bundle may be formed by arranging and bundling one line in a direction perpendicular to the longitudinal direction. This makes it possible to form a winding bundle of an appropriate shape that does not become excessively flat even when a larger number of windings are bundled. Therefore, by arranging and winding this winding bundle along the winding axis of the coil so that the direction perpendicular to the longitudinal direction of the winding is in a line, the impedance of each series-connected coil group connected in parallel can be reduced. It is possible to form a coil having a greater number of parallels while maintaining the same. As a result, eddy current loss can be further reduced. FIG.
It is explanatory drawing which shows an example of the connection structure at the time of forming the coil for one phase of the electric motor which is a modification. As shown in FIG. 4, the winding bundle 15 is formed by arranging and bundling four windings 14a to 14d in a line perpendicular to the longitudinal direction, and bundling the windings 14a to 14d in a line. The length in the column direction is formed to be longer than the length in the longitudinal direction of the windings 14a to 14d. This is to increase the number of parallel windings and to prevent twisting or the like when winding the winding bundle 15 to form a coil, thereby making the winding operation easier. Further, as shown in FIG.
Is the winding 1 along the winding axis of the coil (the axis of the teeth 42).
They are arranged and wound so that the direction perpendicular to the longitudinal direction of 4a to 14d becomes one line. By doing so, when the windings are viewed from the direction in which the magnetic flux fluctuates (the direction A in FIG. 4), the widths of the windings 14a to 14d become narrower, so that the eddy current loss can be further reduced. The windings 14a to 14
b is bundled by, for example, heating and bonding an insulating film such as a resin formed on each outer surface thereof.

Here, a winding bundle forming method of an embodiment in which a plurality of windings are bundled to form a winding bundle will be described. FIG.
FIG. 1 is a configuration diagram illustrating a schematic configuration of an apparatus that forms a winding bundle by bundling a plurality of windings and winds the winding around a winding frame. This device comprises a plurality of winding supply bobbins 50 as shown.
a to 50d supplied from a plurality of rectangular windings 52a to 52d
A winding frame 62 around which a winding bundle 54 in which d is bundled in a row is wound
And a plurality of windings 52 a to 52 wound around the winding frame 62.
d are arranged in a line and a set of two pairs of first rollers 64 for giving a predetermined tension, and a plurality of windings 52a to 52d aligned by the first rollers 64 are adhered to each other to form a winding bundle 54. Heating device 66 for heating to the forming temperature
A set of two pairs of second rollers 68 for adjusting the winding bundle 54 formed by bonding by heating of the heating device 66 into a predetermined shape (rectangular shape) and applying a predetermined tension;
The cooling device 70 cools the high-temperature winding bundle 54 formed by the rollers 68. The plurality of windings 52a to 52d are, for example, self-fusing windings as windings that can be adhered to each other by heating. By bonding, the winding bundle 54 is formed.

A plurality of windings 52a to 52d in the device thus configured are formed as a winding bundle 54, and a winding frame 62 is formed.
The process until winding is described. FIG. 6 is a process explanatory diagram illustrating a process until a plurality of windings is wound around a winding frame as a winding bundle. As shown in FIG. 6, first, the windings 52a-5 supplied from the winding supply bobbins 50a-50d are provided.
2d are aligned in a line (step S10), and the aligned windings 5
2a to 52d are heated to a temperature at which they can be bonded to each other (step S12). Next, the plurality of windings 52a to 52
The shape of the winding bundle 54 formed by bonding d is formed into a predetermined rectangular shape (step S14), and the winding bundle 54 in a high temperature state is cooled (step S16). Thereafter, the winding bundle 54 is directly wound around the winding frame 62 (step S18),
Complete.

According to the winding bundle forming method of the embodiment described above, the winding bundle 54 in a high temperature state formed by heating and bonding.
Is cooled, the subsequent winding work around the winding frame 62 can be performed smoothly. As a result, work efficiency can be further improved.

In the winding bundle forming method of the embodiment, the winding bundle 54 in the high temperature state is cooled and then wound directly around the winding frame 62. However, the winding bundle 54 is not wound directly around the winding frame 62, but is once wound around a bobbin or the like. No problem.

In the winding bundle forming method according to the embodiment, the winding bundle 54 formed by heating and bonding is formed (arranged) into a predetermined rectangular shape. However, the winding bundle 54 may not be formed if unnecessary.

In the winding bundle forming method of the embodiment, the plurality of windings 52a to 52d aligned by the first roller 64 are bonded by heating the heating device 66. By configuring the heating rollers 52a to 52d as heatable heating rollers, a plurality of windings 52
The alignment and heating of a to 52d may be performed almost simultaneously.

The embodiments of the present invention have been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various embodiments may be made without departing from the gist of the present invention. Of course, it can be carried out.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a connection structure of a coil for one phase of an electric motor according to an embodiment of the present invention.

FIG. 2 shows teeth 4 of a stator 40 of the electric motor according to the embodiment.
FIG. 2 is an explanatory view showing a state where a rectangular wound coil 22 and a trapezoidal wound coil 32 are attached to 2;

FIG. 3 is an explanatory diagram showing an example of a case where n coils having different shapes are connected;

FIG. 4 is an explanatory view showing a connection structure of a coil for one phase of a motor which is a modification of the present invention.

FIG. 5 is a configuration diagram illustrating a schematic configuration of an apparatus that forms a winding bundle by bundling a plurality of windings and winds the winding bundle.

FIG. 6 is a process explanatory diagram illustrating a process until a plurality of windings are wound around a winding frame as a winding bundle.

[Explanation of symbols]

10a, 10b, 12a, 12b windings, 11, 13
Winding bundle, 22 rectangular wound coils, 24, 26 rectangular coils, 32 trapezoidal wound coils, 34, 36 trapezoidal coils,
40 stator, 42 teeth, 50a to 50d winding supply bobbin, 52a to 52d winding, 54 winding bundle,
62 reel, 64 first roller, 66 heating device, 68
Second roller, 70 cooling device.

Continued on the front page F-term (reference) 5H603 AA03 AA07 AA09 BB01 BB05 BB12 CA01 CA05 CB01 CC11 CC17 CD21 CD32 CD33 CE02 CE03 CE05 EE09 FA18 5H615 AA01 BB01 BB05 BB14 PP01 PP12 QQ03 QQ05 QQ19 QQ26 SSQ28 SS24 SS01

Claims (19)

[Claims] An electric motor including a plurality of phase coils formed by connecting a plurality of series-connected coil groups formed by connecting a plurality of coils having different shapes in series in parallel. 2. The electric motor according to claim 1, wherein the series connection coil group includes a series connection of a rectangular coil and a trapezoidal coil. 3. The electric motor according to claim 1, wherein the plurality of coils having different shapes are wound by a winding bundle in which a plurality of windings are bundled. An electric motor in which each winding constituting the winding bundle of the coil is connected in series. 4. The electric motor according to claim 3, wherein the winding bundles are bundled in a row such that a side surface perpendicular to a longitudinal direction of a cross section of the windings is in contact with the winding bundle. 5. The electric motor according to claim 4, wherein the plurality of coils having different shapes are arranged and wound by a winding bundle in which windings are bundled in a line in a direction parallel to the axis of the coil. 6. The electric motor according to claim 4, wherein the length of the winding in the longitudinal direction with respect to the length in the direction perpendicular to the longitudinal direction of the cross section is approximately 1.5. 7. The electric motor according to claim 3, wherein the winding bundles are bundled in a row such that side surfaces parallel to a longitudinal direction of a cross section of the windings are in contact with each other. 8. The electric motor according to claim 7, wherein the winding bundles are bundled such that a length in a row direction for bundling the windings is longer than a length in a longitudinal direction of the windings. 9. The electric motor according to claim 7, wherein the plurality of coils having different shapes are arranged and wound by a winding bundle in which windings are bundled in a line in a direction parallel to a winding axis of the coil. 10. A method for connecting phase coils of an electric motor, wherein a plurality of coils having different shapes are connected in series and a plurality of series-connected coil groups formed in series are connected in parallel. 11. A motor coil formed by winding a plurality of windings in a row so as to be in contact with a side surface perpendicular to a longitudinal direction of a cross section of the windings. 12. The motor coil according to claim 11, wherein the winding bundle is formed by bundling a plurality of windings in a row in a direction parallel to a winding axis of the coil. 13. The motor coil according to claim 11, wherein the length of the winding in the longitudinal direction with respect to the length in the direction perpendicular to the longitudinal direction of the cross section is approximately 1.5. 14. A motor coil formed by winding a plurality of windings in a row so as to be in contact with a side surface parallel to a longitudinal direction of a cross section of the windings. 15. The electric motor coil according to claim 14, wherein the winding bundles are bundled such that a length in a row direction for bundling the windings is longer than a length in a longitudinal direction of the windings. 16. The motor coil according to claim 14, wherein the winding bundle is formed by bundling a plurality of windings in a row in a direction parallel to a winding axis of the coil. 17. A winding bundle forming method for forming a winding bundle by bundling a plurality of windings, comprising: an aligning step of aligning the plurality of windings in a line; and bonding the aligned plurality of windings by heating. And a cooling step of cooling the winding bundle formed by the heating. 18. The winding bundle forming method according to claim 17, further comprising a winding step of winding the winding bundle cooled in the cooling step around a winding frame. 19. The winding bundle forming method according to claim 17, further comprising a forming step of forming a winding bundle formed by heating in the heating step into a predetermined shape before being cooled in the cooling step.