JP2002223542A - Coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain low loss and miniaturization of an electrical apparatus by increasing space factor of a coil section to a designed space for storing the coil section, and to avoid malfunctions caused by an increase in wiring resistance due to heating by improving heat dissipation of the coil section. SOLUTION: The coil section 2 is formed by winding a square conductor W, and the sectional shape A of the square conductor W is made different, by a winding position in correspondence with a restriction of the designed space S storing the coil section 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a motor, a generator,
The present invention relates to a coil device having a coil portion around which a conductive wire suitable for use in electric equipment such as a transformer is wound.

[0002]

2. Description of the Related Art In general, it is advantageous to reduce the winding resistance of a coil part constituting a main part of a coil device as much as possible in order to reduce the loss and reduce the size of electric equipment. Therefore, it is required that the coil portion occupy the designed space for housing the coil portion without waste.

FIG. 8 shows a conventional coil device 50, that is, a coil device 50 having a magnetic pole coil portion 52 wound around a core portion 51c of a stator core 51 constituting a motor. In the illustrated coil device 50, a round conductive wire 52w is wound so as to fill a designed space Sr for accommodating the coil portion 52, and the space Sr is formed outside (the stator core 51).
Since the shape of the round conductive wire 52w is wider, the number of turns (the number of turns) of the round conductive wire 52w is also increased toward the outer side.

[0004]

However, such a conventional coil device 50 has the following problems.

[0005] First, since the coil portion 52 is formed by winding the round conductor 52w, the coil portion 52 with respect to the space Sr is formed.
Occupancy rate of the coil portion 52 is reduced.
In s, the alignment of the round conductors 52w deteriorates, and the space factor greatly decreases.

Second, since the round conductors 52w are stacked in a plurality of stages, heat dissipation is reduced, and the heat generated by the round conductors 52w further increases the winding resistance.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems existing in the prior art, and increases the space factor of the coil unit with respect to the design space for accommodating the coil unit, thereby reducing the loss of electric equipment. It is another object of the present invention to provide a coil device capable of reducing the size and increasing the heat radiation of the coil portion to avoid a problem that the winding resistance increases due to heat.

[0008]

SUMMARY OF THE INVENTION According to the present invention, when a coil device 1 having a coil portion 2 wound with a conductor is formed, a coil portion 2 is formed by winding a square wire W. The shape of the cross section A of the square conducting wire W is made different depending on the winding position in response to the restriction of the space S in the design for accommodating the coil portion 2. In this case, according to a preferred embodiment, the coil portion 2 can be formed by a single layer winding, and can be applied to the magnetic pole coil portions 2 wound around the core portions 12 of the stator core 11 constituting the motor.

Thus, the shape of the cross section A of the rectangular conductor W corresponds to the restriction of the space S for accommodating the coil portion 2 and differs depending on the winding position. In addition to avoiding a decrease in the rate, the coil portion 2 can be further wound in a single layer, and a decrease in heat dissipation, which is a problem when a plurality of round conductors are stacked, is avoided.

【Example】

Next, preferred embodiments according to the present invention will be described.
This will be described in detail with reference to the drawings.

First, the configuration of a coil device 1 according to the present embodiment will be described with reference to FIGS.

FIG. 1 shows a field section 20 of the motor. 11
Is a stator iron core formed in a cylindrical shape.
A plurality of cores 12 arranged at regular intervals in the circumferential direction are fixed to the inner surface of the stator core 1 toward the center of the stator core 11. Each of the core portions 12 can be configured by laminating a plurality of silicon steel plates 22 as shown in FIG. 2, for example. A coil bobbin 23 formed of an insulating material is mounted on the outer surface of each of the core portions 12, and the coil portion 2 is wound (mounted) on the coil bobbin 23. The coil bobbins 23 can have a divided structure in order to mount the separately manufactured coil unit 2.

In this case, the axial dimension of the coil section 2 (dimension in the radial direction of the stator core 11) is restricted by the core section 12, and the radial dimension (stator core 1) is restricted.
1 in the circumferential direction) is limited by the shape of the designed space S in which the interval between the core portions 12 is bisected. Each of the core portions 12 in the embodiment protrudes from the curved surface of the stator core 11 toward the center as shown in FIG.
Since the space S for accommodating an arbitrary coil portion 2 has a shape that expands outward (toward the stator core 11), the coil portion 2
It is designed to fill this design space S.

That is, the coil portion 2 is formed by single-layer winding, and the cross-sectional shape of the rectangular conductive wire W is changed depending on the winding position in accordance with the restriction of the space S. Therefore, in the case of the embodiment, as shown in FIG.
The width of the square conductive wire W becomes wider toward the side 1).

Next, a method of manufacturing such a coil portion 2 will be specifically described with reference to FIGS.

First, a rectangular conducting wire W shown in FIG. 3 formed of a copper plate is prepared. The cross section A of this square conducting wire W is shown by a virtual line in FIG. The thickness t of the rectangular conducting wire W is constant in the longitudinal direction. Also, as shown in FIG. 3, steps D1, D2, D3,... Are provided at predetermined intervals on one side of the rectangular conductive wire W, so that the rectangular conductive wire W is sequentially widened in the longitudinal direction. In this case, the distance L between the steps Do (start end), D1, D2,.
1, L2, L3,... Are designed to be one turn of the coil unit 2.

Then, the coil portion 2 is manufactured using the rectangular conductive wire W. In this case, upon manufacturing, a patent No. 28
No. 47640 can be used. That is, as shown in FIG. 5, a predetermined position (predetermined section) in the square conductive wire W is rolled by a pair of conical (tapered) rolling rollers 31, 32 (winding machine) shown in FIG. The curved portions Wr curved at 90 ° are formed, and the curved portions Wr are sequentially formed at predetermined intervals so as to be fitted to the outer surface of the coil bobbin 23. Thereby, the coil unit 2 shown in FIG. 2 can be manufactured, and such a manufacturing process can be completely automated. The insulation process is performed by inserting a polyester film between the adjacent square conductors W, aligning the square conductors W while applying an adhesive, and applying a current to the coil portion 2 to heat and bond the whole. Fix it.

After that, the coil bobbin 23 is inserted into the manufactured coil portion 2, and the core portion 1 is further inserted into the coil bobbin 23.
2 is inserted, and the rear end of the core portion 12 is fixed to the inner surface side of the stator core 11 by welding or the like, whereby the coil device 1 in the field portion 20 can be configured.

According to the coil device 1 according to the present embodiment, as shown in FIG. 1, the outer peripheral portion 2s of the coil portion 2 can be formed along the inclined surface having a fixed angle, so that the adjacent coil portions can be formed. The gap Sc between the portions 2 can be made extremely small, and the space factor of the coil portion 2 with respect to the design space S is
The space factor when a conventional coil device, that is, a round conductor is wound, can be dramatically increased, and the winding resistance is 35% lower than that of a conventional equivalent device in which a round conductor is wound. ], The loss and the size of the motor can be reduced. In addition, the single-layer winding of the coil portion 2 can dramatically increase the heat radiation of the coil portion 2 with respect to the conventional coil device, that is, the heat radiation when a plurality of round conductors are stacked. The problem of increased line resistance was also avoided.

FIGS. 6 and 7 show a coil device 1 according to a modified embodiment of the present invention. The modified embodiment of FIG.
The difference from the embodiment of FIG. 1 is that the thickness t of the rectangular conducting wire W is varied along the longitudinal direction. That is, in the embodiment of FIG. 1, the rectangular conductor W having a constant thickness t in the longitudinal direction is used.
In the modified example, the thickness t becomes thinner as the width of the square conducting wire W becomes wider. Thereby, when attention is paid to the cross-sectional area (cross-section A) of the square conducting wire W, in the embodiment of FIG. 1, the cross-sectional area increases toward the outside of the coil portion 2 (toward the stator core 11). The cross-sectional area of the rectangular conducting wire W can be made substantially equal at the beginning and end of winding of the coil portion 2. Therefore, although the modified embodiment of FIG. 6 is disadvantageous in terms of cost, it has an advantage that the winding resistance (heat dissipation) can be made uniform in the longitudinal direction of the rectangular conductor W.

The modified embodiment shown in FIG. 7 shows a case where the present invention is applied to an arbitrary coil device 1, for example, an arbitrary inductance device, and particularly shows a case where the designed space S is barrel-shaped. As described above, the coil device 1 according to the present invention can be easily applied to a design space S having an arbitrary shape. In FIGS. 6 and 7, the same parts as those in FIG. 1 are denoted by the same reference numerals to clarify the configuration, and a detailed description thereof will be omitted.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment (modified embodiment), and arbitrarily changes, adds, or deletes the details of the configuration, shape, material, quantity, etc. without departing from the gist of the present invention. be able to.

[0023]

As described above, in the coil device according to the present invention, the coil portion is formed by winding the rectangular conductor,
The following remarkable effects are obtained because the cross-sectional shape of the rectangular conductive wire is changed depending on the winding position in accordance with the restriction on the design space for housing the coil portion.

(1) The space factor of the coil portion with respect to the design space can be remarkably increased as compared with the conventional coil device, so that the loss and the size of the electric equipment can be reduced.

(2) According to the preferred embodiment, since the coil portion can be wound in a single layer, the heat radiation of the coil portion can be remarkably improved as compared with the conventional coil device, and the winding resistance can be increased by heat. Can be avoided.

(3) According to the preferred embodiment, if the coil portion is applied to a coil portion for a magnetic pole wound around a core portion of a stator core constituting a motor, particularly, the motor has low loss and small size. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view of a coil device according to a preferred embodiment of the present invention,

2 is a cross-sectional view at an X position in FIG. 1,

FIG. 3 is a side view of a square conductive wire used for a coil portion in the coil device.

FIG. 4 is an explanatory view of a manufacturing method when manufacturing the coil unit,

FIG. 5 is another explanatory view of a manufacturing method for manufacturing the coil unit.

FIG. 6 is a sectional configuration diagram of a coil device according to a modified embodiment of the present invention,

FIG. 7 is a sectional configuration diagram of a coil device according to another modified embodiment of the present invention;

FIG. 8 is a cross-sectional configuration diagram of a coil device according to a conventional technique;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil device 2 Coil part W Square conductor S Design space A Cross section of square conductor 11 Stator core 12 ... Core part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 3/12 H02K 3/12 3/18 3/18 P 3/48 3/48 F term (Reference) 5H002 AA07 AA09 AC00 5H603 AA09 BB01 BB02 BB12 CA01 CA04 CB02 CB26 CC05 CC11 CC17 CD01 CD21 CD22 CD32 CE02 FA01 5H604 AA08 BB01 BB03 BB14 CC01 CC05 CC15 CC16 PB03

Claims (3)

[Claims] 1. A coil device having a coil portion wound with a conductive wire, wherein the coil portion is formed by winding a rectangular conductive wire, and the coil device is configured to accommodate the coil portion in response to a design space restriction. A coil device characterized in that the cross-sectional shape of a rectangular conducting wire differs depending on a winding position. 2. The coil device according to claim 1, wherein the coil portion is wound in a single layer. 3. The coil device according to claim 1, wherein said coil portion is a coil portion for a magnetic pole wound around a core portion of a stator core constituting a motor.