JPH10201155A - Motor coil and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an eddy current loss without increasing a resistance value, by constituting each coil system, formed between a specific terminal and a common terminal, of a plurality of coils of parallel route. SOLUTION: A single coil unit, which realizes a coil function, is formed, by forming a pattern line in almost triangular spiral shape. In a single coil unit, a coil pattern end part 4 and a through hole 3 are connected to a specific terminal (TU, TV, TW) and a common terminal COM or required location of the coil pattern end part 4 and through hole 3 of the other coil unit. A coil pattern CP is formed by a pattern CP1, CP2 of two parallel routes. The patterns CP1, CP2 are formed in a parallel condition through an insulation part as a slit SL2, a set of the pattern CP1, CP2 are formed in spiral shape through an insulation part as a slit SL1. In this way, an eddy current loss can be large reduced without increasing a resistance value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor coil and a motor equipped with the motor coil.

[0002]

2. Description of the Related Art FIG. 1 shows an example of the configuration of a conventional motor coil.
5 to FIG. These are, for example, conceptual diagrams of a motor coil 90 arranged in a state facing a magnet in a three-phase drive thin motor, for example. FIG. As shown in the figure, terminals TU, TV, and TW are provided with terminals to which three-phase driving power is supplied (the three phases are respectively referred to as U-phase, V-phase, and W-phase) and a common terminal COM. Thus, three coil systems are formed between these terminals. That is,
A U-phase coil system is formed between the U-phase terminal TU and the common terminal COM, a V-phase coil system is formed between the V-phase terminal TV and the common terminal COM, and W is connected between the W-phase terminal TU and the common terminal COM. A phase coil system is formed.

[0003] The U-phase coil system has three coil units U
1, U2, and U3 are connected in series, and the V-phase coil system includes three coil units V1, V2, and V3 connected in series, and W
The phase coil system has three coil units W1, W2, W3
Are connected in series, so that the substrate 91 of the motor coil 90 is
Each of the coil units arranged as shown in FIG. 15 has a circuit configuration as shown in FIG.
In the present specification, for the sake of explanation, one coil element (a coil of one winding unit from the start to the end of winding) as described above is referred to as a “coil unit”, and a specific terminal (a U-phase terminal TU, Or V-phase terminal TV or W-phase terminal T
A terminal-to-terminal path formed by one or more coil units between W) and the common terminal is referred to as a “coil system”.

A motor coil 90 as shown in FIG. 15 is formed in a pattern formed on a substrate by etching or the like. FIG. 16 shows an image of a coil pattern CP forming each coil unit. Thus, one coil unit realizing the coil function is formed by forming the pattern line in a substantially triangular spiral shape. It is formed. Of course, in practice, the spiral shape is more multi-turn. In one coil unit, a pattern end 93 and a through hole 92 are connected to a specific terminal (TU or TV or TW), a common terminal COM, or a required portion of the pattern end 93 or the through hole 92 of another coil unit. Thus, the circuit of FIG. 18 is formed.

FIG. 17 shows an image of the coil pattern CP formed on the substrate 91 at the DD section (the actual sectional shape is often a more complicated shape). A coil pattern CP, which is a conductor, is formed across the insulating portion Z).

[0006]

In general, an eddy current loss is generated in a coil. To reduce the eddy current loss, a coil or another terminal connected by one series path must be used. (That is, one coil system in this specification), it is necessary to reduce the width of the line when the line is viewed from the direction of the magnetic flux applied to the line. That is, when the width of the line as the coil pattern is reduced or thinned, or when the winding coil is formed of a wire, a thinner wire is used.

However, reducing the width of the wire while keeping the thickness of the coil the same means that the resistance increases accordingly. If the resistance value rises even if the eddy current loss decreases, various characteristics such as a decrease in the starting torque deviate from the intended characteristics in design, and are often not practical. Therefore, there has been a problem that a method of reducing the eddy current loss by making the wire thinner in a coil that achieves a predetermined design value cannot be adopted.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and has as its object to reduce eddy current loss without increasing the resistance of a coil.

Therefore, in the motor coil of the present invention, each of the coil systems formed between the specific terminal and the common terminal is
It is configured by a plurality of parallel-path coils. For example, by forming one or a plurality of coil units by a plurality of parallel-connected coils, the coil system can be configured by a plurality of parallel-path coils, or by one or a plurality of parallel-connected coil unit groups. By forming one coil system, the coil system is configured by a plurality of parallel path coils. A motor is formed using such a motor coil.

In the present invention, since the coil system is composed of a plurality of parallel path coils, the resistance (total cross-sectional size) of the coil system can be reduced even if the pattern or wire forming each path is made thin. Can be kept as before.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to fifth embodiments of the present invention will be described with reference to the drawings.

<First Embodiment> FIGS. 1 to 4 show the structure of a motor coil 1 according to a first embodiment. This example is a conceptual diagram of a motor coil 1 arranged in a state opposed to a magnet in a three-phase drive thin motor, similarly to the conventional example described with reference to FIGS.
FIG. 3 is an image diagram of a state in which the motor coil 1 is formed. As illustrated, a U-phase terminal TU, a V-phase terminal TV, a W-phase terminal TW to which three-phase drive power is supplied, and a common terminal CO
M is provided. Then, the U-phase terminal TU and the common terminal CO
M, a U-phase coil system is formed, and a V-phase coil system is formed between the V-phase terminal TV and the common terminal COM.
A W-phase coil system is formed between U and the common terminal COM.

The U-phase coil system has three coil units U
1, U2, and U3 are connected in series, and the V-phase coil system includes three coil units V1, V2, and V3 connected in series, and W
The phase coil system has three coil units W1, W2, W3
Are connected in series.

The motor coil 1 as shown in FIG. 1 is formed in a pattern formed on a substrate by etching or the like. FIG. 2 shows an image of a coil pattern CP forming each coil unit. As shown, approximately 3
By forming the pattern lines in an angular spiral shape, one coil unit that realizes the coil function is formed. In one coil unit, the coil pattern end 4 and the through-hole 3 are connected to a specific terminal (TU or TV or T
W), the common terminal COM, or a required portion of the coil pattern end 4 or through hole 3 of another coil unit.

The present embodiment is characterized in that the coil pattern CP constituting one coil unit is formed by the patterns CP1 and CP2 which form two parallel paths. That is, the pattern CP1 and the pattern CP2 are formed in parallel with each other via an insulating portion serving as the slit SL2, and one set of the pattern CP1 and the pattern CP2 is formed spirally via the insulating portion serving as the slit SL1. That is, it has a double spiral form.

FIG. 3 shows an image of the coil pattern CP formed on the substrate 2 in the AA cross section (the actual cross sectional shape is often a more complicated shape), and no pattern is formed. A coil pattern CP as a conductor is formed across the slit SL1 (insulating portion Z), and the coil pattern CP is also slit SL2.
Pattern CP as a parallel path across (insulating part Z)
1. CP2 is formed.

By forming one coil unit in this manner, the circuit configuration of the motor coil 1 is as shown in FIG. That is, the U-phase coil system disposed between the U-phase terminal TU and the common terminal COM has three coil units U1,
Although U2 and U3 are connected in series, each coil unit U
1, U2 and U3 are each formed by two parallel-connected coil elements by the pattern CP1 and the pattern CP2. Therefore, when viewed as a whole U-phase coil system,
It is constituted by coils of two parallel paths. Similarly, the V-phase coil system disposed between the V-phase terminal TV and the common terminal COM and the W-phase coil system disposed between the W-phase terminal TW and the common terminal COM also have two parallel-path coils. It will be comprised by.

According to such a motor coil 1, the eddy current loss can be reduced and the resistance value can be prevented from increasing. When a conductor passes through a certain alternating magnetic field, an eddy current is generated, which causes a loss.
If the conductor is a long and thin line, an amount proportional to the square of the line width is generated as the eddy current loss. When this is applied to this example, the line width is the width of the patterns CP1 and CP2. Temporary pattern CP
Assuming that the width of CP1 and the width of CP2 are each １ ／ of the width of the coil pattern CP shown in FIG. 16, the eddy current loss is １ ／ as (１ ／) × (１ ／). If the same type of motor coil is used, the eddy current loss is reduced to 1/4.

Further, the coil pattern CP in this example can be considered as a combination of the parallel patterns CP1 and CP2,
Therefore, the width of the coil pattern CP in the coil unit of this example can be considered to be the same as the width of the coil pattern CP in the conventional coil unit described with reference to FIG. Therefore, the resistance value does not increase in the coil unit.

<Second Embodiment> FIGS. 5 to 9 show a second embodiment.
As an embodiment, a configuration of a motor 20 and a motor coil 10 employed in the motor 20 will be described. FIG.
Shows a structure of a flat brushless motor used as a spindle motor in a device such as a headphone stereo CD player.

In the motor 20, the motor coil 10 is fixed to the chassis 25. An upper yoke 26 having an upper magnet 28 fixed thereto and a lower yoke 27 having a lower magnet 29 fixed thereto above and below the motor coil 10.
Are arranged, and the upper yoke 26 and the lower yoke 27 sandwich the motor coil 10 with a gap. The upper yoke 26 and the lower yoke 27 are fixed to the wheel 22.
A shaft 21 is press-fitted into the wheel 22, and the wheel 22 and the upper yoke 26 and the lower yoke 27 can rotate around the shaft 21.

The shaft 21 is in contact with the thrust receiver 23 in the thrust direction, and
The second burring portion is supported by a bearing 24 which is press-fitted. Further, the wheel 22 is attached to the chassis 25 by the attraction magnet 30 attached to the wheel 22 so that the wheel 22 and the upper yoke 26 and the lower yoke 27 fixed thereto are not rattled in the thrust direction.
Side (the thrust receiver 23 side).

As shown in FIG. 6A, the motor coil 10 has a two-layer structure of an upper coil portion 11 and a lower coil portion 12. The arrangement of the coil units in the upper coil section 11 and the lower coil section 12 is shown in FIGS. That is, nine coil units (U1a to U3a, V1a to V3a, W1a to W3a) are provided in the upper coil unit 11.
Are provided in the order shown in FIG.
Coil units (U1b to U3b, V1b to V3
b, W1b to W3b) are provided in the order shown.

The motor coil 10 is provided with a U-phase terminal TU, a V-phase terminal TV, a W-phase terminal TW to which three-phase drive power is supplied, and a common terminal COM. A U-phase coil system is formed therebetween, and a V-phase coil system is formed between the V-phase terminal TV and the common terminal COM.
A W-phase coil system is formed between the W-phase terminal TU and the common terminal COM. The motor 20 in FIG. 5 is driven by a drive circuit (not shown) from the U-phase terminal TU of the motor coil 10 to the V-phase terminal TV.
When the drive current flows in the order of the W-phase terminal TU → the U-phase terminal..., The wheel 22 is rotated.

The U-phase coil system has six coil units U
1a, U2a, U3a, U1b, U2b, and U3b are formed by being connected in series. The V-phase coil system includes six coil units V1a, V2a, V3a, V1b, V2
b, V3b are connected in series, and the W-phase coil system includes six coil units W1a, W2a, W3a, W1b, W2
b and W3b are connected in series.

Each coil unit in the motor coil 10 as shown in FIG. 6 has a shape as shown in FIG. 7 as a coil pattern CP on the substrate, as in the case of the above-described first embodiment. That is, the coil pattern CP constituting one coil unit is formed in a double spiral form by the patterns CP1 and CP2 forming two parallel paths.

FIG. 8 shows an image of the coil pattern CP in a BB section. Note that this BB-section is a section image near the through hole 3. Coil pattern C
As for P, a coil pattern CP as a conductor is formed across the slit SL1 (insulating portion Z), and the coil pattern CP is also slit SL2.
Pattern CP as a parallel path across (insulating part Z)
1. CP2 is formed. Since the coil unit having such a cross-sectional image is formed in two layers by the upper coil unit 11 and the lower coil unit 12, two coil units are observed in the cross section as illustrated.

In the present embodiment in which the coil unit is formed in this way and the upper and lower coil portions 11 and 12 are formed, the circuit configuration of the motor coil 10 is as shown in FIG. That is, the U-phase coil system arranged between the U-phase terminal TU and the common terminal COM has six coil units U1
a, U1b, U2b, U2a, U3a, and U3b are connected in series in this order. And each coil unit U1a, U1
b, U2b, U2a, U3a, and U3b are each formed by two parallel-connected coil elements by the pattern CP1 and the pattern CP2, and therefore, when viewed as a whole U-phase coil system, two parallel-path coils are formed. It will be comprised by. V-phase terminal TV and common terminal CO
V-phase coil system disposed between M and W-phase coil system disposed between W-phase terminal TW and common terminal COM,
Similarly, each of the coils is constituted by two parallel-path coils.

According to the motor 20 employing such a motor coil 10, it is possible to reduce the eddy current loss and not to increase the resistance value. That is, when realizing a desired target design value, Loss can be reduced and operation efficiency can be improved.

<Third Embodiment> Referring to FIGS.
As a third embodiment, a configuration of a motor and a motor coil 30 employed in the motor will be described. The configuration of the motor is the same as that described in the second embodiment, and a description thereof will be omitted. Further, the motor coil 30 is of a three-phase drive system and has a two-layered coil portion, similarly to the motor coil 10 described above. The arrangement of the coil units is the same as in FIG.

In this example, one coil unit itself is not formed with a plurality of coils of parallel paths. For example, as shown in FIG. 10, one coil unit is formed in a spiral shape through a slit SL1. The coil pattern is the same as that described with reference to FIG. And C-C
The image in the cross section is shown in FIG.
A coil pattern CP, which is a conductor, is formed across 1 (insulating portion Z).

However, in the case of the present embodiment, a pair of coil units arranged in the vertical direction are connected in parallel in a circuit, so that the coil system is constituted by coils of two parallel paths. In addition, the width of the coil pattern CP formed as shown in FIG. 10 can be reduced to half the size of the example shown in FIG.

The circuit configuration of the motor coil 30 of this embodiment is shown in FIG.
It looks like 2. In the U-phase coil system, the coil unit U
1a, U1b, coil units U2a, U2b, and coil units U3a, U3b are connected in parallel, respectively, and then these three coil unit groups are connected in series. V
The phase coil system and the W-phase coil system take the same form. Even with such a configuration, it is possible to obtain the effect that the line width of the coil pattern is reduced to half, the eddy current loss is reduced, and the resistance value does not increase when viewed from the coil system.

<Fourth Embodiment> FIG. 13 shows a circuit configuration of a motor coil 40 according to a fourth embodiment. FIG. 13 shows that one coil unit is composed of n parallel-path coils (patterns CP1, CP2,..., CP) so that the difference can be seen in comparison with FIG. 4 of the first embodiment.
This is an example in which such coil units are connected in series in each of the U-phase, V-phase, and W-phase coil systems formed in n). In this case, although not shown, the coil pattern of the coil unit is formed by an n-fold spiral pattern.

In each of the embodiments described above, the coil system is constituted by two parallel path coils. However, three or more parallel path coils may of course be formed. If a larger number of parallel paths are formed, the width of the wire in one path can be reduced without increasing the resistance value, and the eddy current loss can be further suppressed.

<Fifth Embodiment> FIG. 14 shows a circuit configuration of a motor coil 50 according to a fifth embodiment. In this example, the coil unit units are connected in parallel as in the third embodiment. For example, coil units U1, U2, U3 as a U-phase coil system as in the example of FIG.
And a coil unit V as a V-phase coil system.
1, V2 and V3 are arranged, and coil units W1, W2 and W3 are arranged as a W-phase coil system.

At this time, as shown in FIG. 14, the coil units U1, U2 and U3 constitute a coil unit group connected in parallel, so that the U-phase coil system is formed by coils of three parallel paths. become. V phase coil system,
The same applies to the W-phase coil system. If a large number of parallel paths are formed in this way, it is possible to increase the resistance without increasing the resistance.
The width of the wire in one path can be made smaller, and the eddy current loss can be further suppressed. In addition, each coil unit group (U1, U2, U3) (V1, V2, V3)
(W1, W2, W3) may be any arrangement three-dimensionally.

<Other Modifications> Although various examples of the embodiments have been described with reference to the drawings, more various examples can be considered as the present invention. Although the example in which the coil pattern CP is divided into two in the width direction has been described, the coil pattern CP may be divided into two in the thickness direction (of course, three or more may be used).

In the first, second, and third embodiments, the plurality of paths are in parallel with each other both in terms of circuit and physically. Is only required to be formed. Of course, it is not limited to a three-phase drive type motor coil. In each of the above examples, the coil is formed by a pattern on the substrate. However, the present invention can be applied to a coil formed by winding a wire. In this case, a plurality of thinner wires may be wound in parallel.

[0040]

As described above, according to the present invention, since each of the coil systems formed between the specific terminal and the common terminal is constituted by a plurality of parallel path coils, the individual path Even if the pattern or the wire rod forming the pattern is made thin, the resistance value when viewed as a coil system can be maintained as before. Therefore, the eddy current loss can be greatly reduced without increasing the resistance value, and thereby, there is an effect that efficiency of operation and power saving of the motor can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a motor coil according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a coil unit of the motor coil according to the first embodiment.

FIG. 3 is a diagram illustrating an image of a cross section taken along line AA of the first embodiment.

FIG. 4 is an explanatory diagram of a circuit configuration of a motor coil according to the first embodiment.

FIG. 5 is an explanatory diagram of a structure of a motor according to a second embodiment.

FIG. 6 is an explanatory diagram of a motor coil according to a second embodiment.

FIG. 7 is an explanatory diagram of a coil unit of a motor coil according to a second embodiment.

FIG. 8 is an explanatory diagram of an image of a BB cross section of the second embodiment.

FIG. 9 is an explanatory diagram of a circuit configuration of a motor coil according to a second embodiment.

FIG. 10 is an explanatory diagram of a coil unit of a motor coil according to a third embodiment.

FIG. 11 is an explanatory diagram of an image of a cross section taken along line CC of the third embodiment.

FIG. 12 is an explanatory diagram of a circuit configuration of a motor coil according to a third embodiment.

FIG. 13 is an explanatory diagram of a circuit configuration of a motor coil according to a fourth embodiment.

FIG. 14 is an explanatory diagram of a circuit configuration of a motor coil according to a fifth embodiment.

FIG. 15 is an explanatory diagram of a conventional motor coil.

FIG. 16 is an explanatory diagram of a coil unit of a conventional motor coil.

FIG. 17 is an explanatory diagram of an image of a cross section taken along line DD of a conventional motor coil.

FIG. 18 is an explanatory diagram of a circuit configuration of a conventional motor coil.

[Explanation of symbols]

1,10,30,40,50 motor coil, 2 substrate, 3 through hole, 20 motor, 21 shaft, 22 wheel, 26 upper yoke, 27 lower yoke, 28 upper magnet, 29 lower magnet, CP,
CP1, CP2 coil pattern, SL1, SL2 slit

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[Procedure amendment]

[Submission date] February 17, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art FIG. 1 shows an example of the configuration of a conventional motor coil.
5 to FIG. These are, for example, conceptual diagrams of a motor coil 90 arranged in a state facing a magnet in a three-phase drive thin motor, for example. FIG. As shown in the figure, terminals TU, TV, and TW are provided with terminals to which three-phase driving power is supplied (the three phases are respectively referred to as U-phase, V-phase, and W-phase) and a common terminal COM. Thus, three coil systems are formed between these terminals. That is,
A U-phase coil system is formed between the U-phase terminal TU and the common terminal COM, a V-phase coil system is formed between the V-phase terminal TV and the common terminal COM, and W is connected between the W-phase terminal TW and the common terminal COM. A phase coil system is formed.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

<First Embodiment> FIGS. 1 to 4 show the structure of a motor coil 1 according to a first embodiment. This example is a conceptual diagram of a motor coil 1 arranged in a state opposed to a magnet in a three-phase drive thin motor, similarly to the conventional example described with reference to FIGS.
FIG. 3 is an image diagram of a state in which the motor coil 1 is formed. As illustrated, a U-phase terminal TU, a V-phase terminal TV, a W-phase terminal TW to which three-phase drive power is supplied, and a common terminal CO
M is provided. Then, the U-phase terminal TU and the common terminal CO
U, a U-phase coil system is formed between the V-phase terminal TV and the common terminal COM, and a W-phase terminal T is formed.
A W- phase coil system is formed between W and the common terminal COM.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

The motor coil 10 is provided with a U-phase terminal TU, a V-phase terminal TV, a W-phase terminal TW to which three-phase drive power is supplied, and a common terminal COM. A U-phase coil system is formed therebetween, and a V-phase coil system is formed between the V-phase terminal TV and the common terminal COM.
A W-phase coil system is formed between the W-phase terminal TW and the common terminal COM. The motor 20 in FIG. 5 is driven by a drive circuit (not shown) from the U-phase terminal TU of the motor coil 10 to the V-phase terminal TV.
When the drive current flows in the order of W-phase terminal TW → U-phase terminal,..., The wheel 22 is rotated.

Claims (4)

[Claims] 1. One or more coil systems formed between a specific terminal and a common terminal are formed, and each of the one or more coil systems is constituted by a plurality of parallel path coils. A motor coil, characterized in that: 2. A single coil system is formed by one or a plurality of series-connected coil units, and one or a plurality of coil units are formed by a plurality of parallel-connected coils, so that a plurality of coil systems are formed. The motor coil according to claim 1, wherein the motor coil is configured by a coil having a parallel path. 3. A single coil system is formed by one or a plurality of coil unit groups connected in parallel, so that the coil system is configured by a plurality of parallel path coils. The motor coil according to claim 1. 4. One or more coil systems formed between a specific terminal and a common terminal are formed, and each of the one or more coil systems is constituted by a plurality of parallel path coils. A motor having a motor coil and being driven by supplying drive power to one or a plurality of coil systems.