JP2529964B2 - Ironless core armature coil - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coreless armature coil.

[Background technology]

The coreless armature coil is an inner layer coil body and an outer layer coil in which a large number of coil wires extending in the axial direction are arranged in the circumferential direction to form a cylindrical shape and are fitted together and at least one of which is twisted in the circumferential direction. And a connecting conductor for connecting the coil element wires that are opposed to each other in the radial direction on both end surfaces of the inner layer coil body and the outer layer coil body.

By the way, in order to obtain different motor characteristics for a motor having an ironless core armature coil, conventionally, the diameter and the number of turns of the coil wire have been changed.

However, since the outer dimensions of the ironless core armature coil are changed, it is necessary to change various dimensions of the entire motor.

[Object of the Invention]

An object of the present invention is to provide a coreless armature coil that can obtain different motor characteristics without changing the outer dimensions of the coreless armature coil.

[Disclosure of Invention]

The ironless core armature coil of the present invention is an inner layer coil body in which a large number of axially extending coil element wires are arranged in the circumferential direction to form a cylindrical shape and are mutually fitted and at least one of them is twisted in the circumferential direction. And an outer layer coil body, and a connecting conductor that connects the coil wire strands of the inner layer coil body and the outer layer coil body opposite to each other in the radial direction of the both end faces, It is characterized in that the coil element wires of the same kind of metal are arranged in the circumferential direction so that the coil element wires of the same kind of metal are distributed substantially evenly in the circumferential direction of the cylindrical shape.

According to the structure of the present invention, the coil wire is formed of a plurality of coil wires of different metals, and the coil wires of the same metal are distributed substantially evenly in the cylindrical circumferential direction. By arranging the wires in the circumferential direction, it is possible to change the material for each wire material instead of changing the material for each layer, so it is possible to adjust the finer characteristics and set the usage ratio of the coil wire. For example, when using a wire material of aluminum and copper, it is possible to set in the middle of the characteristics of all aluminum and all copper, and various different motor characteristics can be obtained. Moreover, since the diameter and the number of turns of the coil wire are not changed, it is not necessary to change the outer dimensions of the ironless armature coil.

When the coreless armature coil rotates at high speed, the rigidity of the coil is important. For example, when a coil is made using aluminum and copper wire, the Young's modulus is 0.72 × 10 ⁴ kg for aluminum and copper, respectively. / mm ² , 1.25 x 1
Since it is different from 0 ⁴ kg / mm ² , the layer containing only aluminum has low rigidity and is easily deformed. However, by arranging the aluminum and copper wires substantially evenly in the circumferential direction, the low rigidity of aluminum can be covered by the copper wire.

Furthermore, the ironless core armature coil heats up due to resistance during use, and reaches a temperature of 100 to several tens of degrees Celsius depending on the operating conditions, but the problem at this time is the difference in the coefficient of thermal expansion, since the linear expansion coefficient is large and the linear expansion coefficient of 23.8 × 10 ^-6 of aluminum relative to 16.8 × 10 ^-6, easily peeled off in layers in coil layers and copper only layer of aluminum only. Further, even if the layers are not peeled off, there is a problem that the coil is deformed by the bimetal action due to the difference in linear expansion coefficient between the layers. However, by arranging the aluminum wire and the copper wire substantially evenly in the circumferential direction, the problem of peeling between layers can be solved, and there is no fear of deformation.

In addition, coil wires of different metals are lined up in the circumferential direction to form coil bodies of outer or inner layers so that coil wires of the same metal are distributed substantially evenly in the circumferential direction of the cylinder, so that the resistance and dynamic balance are made uniform. In addition, by using aluminum or the like, the weight can be reduced as a whole and the inertia of the ironless armature coil can be reduced.

Embodiment An embodiment of the present invention will be described with reference to FIGS. That is, this ironless core armature coil is an inner layer coil in which a large number of coil wires 1 extending in the axial direction are arranged in the circumferential direction to form a cylindrical shape and are mutually fitted and at least one of them is twisted in the circumferential direction. The body 2 and the outer layer coil body 3, and the connecting conductors 4 that connect the coil wires 1 that are opposed to each other in the radial direction on both end surfaces of the inner layer coil body 2 and the outer layer coil body 3 and connect the coil wires 1 to a plurality of different types. The coil element wires 1a and 1b are made of metal, and the coil element wires 1a and 1b of different metals are arranged in the circumferential direction so that the coil element wires of the same kind of metal are distributed substantially evenly in the circumferential direction of the cylinder.

In the embodiment, the coil wire 1 of the outer layer coil body 3 is composed of the coil wire 1a made of copper and the coil wire 1b made of aluminum, and these coil wires 1a are alternately arranged in the circumferential direction. , 1b are arranged at equal intervals in the circumferential direction, and the inner layer coil body 2 is composed of a coil wire 1a made of copper.

Therefore, the motor characteristics of this embodiment show intermediate characteristics between the motor characteristics when only the copper coil wire 1a is used and the motor characteristics when only the aluminum coil wire 1b is used. That is, the aluminum coil wire 1b is increased to reduce the mechanical time constant, and the copper coil wire 1a is increased to increase the torque.

In this case, since there is a difference in resistance and specific gravity between the copper coil wire 1 and the aluminum coil wire 1b, the aluminum coil wire 1b is arranged in the circumferential direction so that the resistance and the dynamic balance are equalized. Are provided at even intervals. Further, in order to reduce the inertia of the ironless core armature coil, it is preferable to provide the outer coil body 3 with the aluminum coil wire 1b.

Explaining the manufacturing process of the ironless core armature coil, FIG. 3 shows a wire sheet 5 in which a plurality of strip-shaped sheets of copper coil wire 1a are arranged in parallel. As shown in FIG. 4, a plurality of the strand sheets 5 are arranged in the circumferential direction into a cylindrical shape, and twisted in the circumferential direction as shown in FIG. 5A to form the inner layer coil body 2. Similarly, the outer layer coil body 3 is formed as shown in FIG. 5 (b), but the wire sheet 5 is made of aluminum coil elements every other one of the copper coil element wires 1a as shown in FIG. The wire 1b is interposed and the twisting direction is opposite to the inner layer coil body 2. In this case, the usage ratio of the aluminum coil wire 1b and the copper coil wire 1a is determined according to the desired motor characteristics. When the inner layer coil body 2 (Fig. 5 (a)) and the outer layer coil body 3 (Fig. 5 (b)) are fitted together, the result is as shown in Fig. 6, and the end face is as shown in Fig. 1. The connecting conductors 4 connect the coil wires 1 of the inner layer coil body 2 and the outer layer coil body 3 to each other. In this way, the coreless armature coil forming a coil loop is formed by the inner layer coil body 2 and the outer layer coil body 3. Further, although not shown, a commutator body having a rotary shaft is attached to the ironless core armature coil, and the commutator segment and a predetermined coil wire are connected to form the ironless core armature.

According to this embodiment, the coil wire 1 is formed by the coil wire 1a made of copper and the coil wire 1b made of aluminum so that the coil wires of the same metal are distributed substantially evenly in the circumferential direction of the cylinder. , These coil wires 1a, 1b are arranged alternately in the circumferential direction, so instead of changing the material for each layer,
Since it is possible to change the material for each wire material, it is possible to finely adjust the characteristics.By setting the usage ratio of the coil wires 1a and 1b, the characteristics can be set between the characteristics of all aluminum and the characteristics of all copper. It becomes possible to set, and various different motor characteristics can be obtained. Moreover, since the diameter and the number of turns of the coil wire 1 are not changed, it is not necessary to change the outer dimensions of the ironless armature coil.

When the coreless armature coil rotates at high speed, the rigidity of the coil is important, but the Young's modulus of aluminum and copper is 0.72 × 10 ⁴ kg / mm ² and 1.25 × 10 ⁴ kg / m ² , respectively.
Since it is different from m ² , the layer made of only aluminum has low rigidity and is easily deformed. However, since the aluminum and copper wire rods are alternately arranged in the circumferential direction, the copper wire can cover the low rigidity of aluminum.

Furthermore, the ironless core armature coil heats up due to resistance during use, and reaches a temperature of 100 to several tens of degrees Celsius depending on the operating conditions, but the problem at this time is the difference in the coefficient of thermal expansion, since the linear expansion coefficient is large and the linear expansion coefficient of 23.8 × 10 ^-6 of aluminum relative to 16.8 × 10 ^-6, easily peeled off in layers in coil layers and copper only layer of aluminum only. Further, even if the layers are not peeled off, there is a problem that the coil is deformed by the bimetal action due to the difference in linear expansion coefficient between the layers. However, since the aluminum wire and the copper wire are alternately arranged in the circumferential direction, the problem of peeling between the layers can be solved and the fear of deformation is eliminated.

Further, in order that the coil wires of the same metal are distributed substantially evenly in the circumferential direction of the cylindrical shape, the coil wires 1a and 1b are alternately arranged in the circumferential direction to form the coil bodies 2 and 3 of the outer layer or the inner layer,
The resistance and the dynamic balance can be made uniform, and the weight can be reduced as a whole by using aluminum or the like, and the inertia of the ironless core armature coil can be reduced.

FIG. 7 shows another embodiment, in which the inner layer coil body 2 and the outer layer coil body 3 are opposed to each other in the radial direction of the coil wire 1 and are made of aluminum at equal intervals in the circumferential direction. The wire 1b is used, and the others are copper coil wires 1a.

Further, when the coil wire made of a magnetic material (Ni, Fe, etc.) is used in a specific ratio, the air gap of the motor is reduced and the motor characteristics can be improved.

In the above embodiment, both the inner layer coil body 2 and the outer layer coil body 3 are twisted in the circumferential directions opposite to each other, but even if only one of them is twisted, the inner layer coil body 2 and the outer layer coil body 3 as a whole. Can form a coil loop.

〔The invention's effect〕

According to the ironless core armature coil of the present invention, the coil wire is formed by a plurality of coil wires made of different metals, and the coil wires made of the same metal are made different in such a manner that the coil wires are evenly distributed in the cylindrical circumferential direction. Since the metal coil wires are arranged in the circumferential direction, it is possible to change the material for each wire material instead of changing the material for each layer. By setting, for example, when using a wire material of aluminum and copper, it becomes possible to set in the middle of the characteristics of all aluminum and all copper,
A variety of different motor characteristics can be obtained. Moreover, since the diameter and the number of turns of the coil wire are not changed, it is not necessary to change the outer dimensions of the ironless armature coil.

When the coreless armature coil rotates at high speed, the rigidity of the coil is important. For example, when a coil is made using aluminum and copper wire, the Young's modulus is 0.72 × 10 ⁴ kg for aluminum and copper, respectively. / mm ² , 1.25 x 1
Since it is different from 0 ⁴ kg / mm ² , the layer containing only aluminum has low rigidity and is easily deformed. However, by arranging the aluminum and copper wires substantially evenly in the circumferential direction, the low rigidity of aluminum can be covered by the copper wire.

Furthermore, the ironless core armature coil heats up due to resistance during use, and reaches a temperature of 100 to several tens of degrees Celsius depending on the operating conditions, but the problem at this time is the difference in the coefficient of thermal expansion, since the linear expansion coefficient is large and the linear expansion coefficient of 23.8 × 10 ^-6 of aluminum relative to 16.8 × 10 ^-6, easily peeled off in layers in coil layers and copper only layer of aluminum only. Further, even if the layers are not peeled off, there is a problem that the coil is deformed by the bimetal action due to the difference in linear expansion coefficient between the layers. However, by arranging the aluminum wire and the copper wire substantially evenly in the circumferential direction, the problem of peeling between layers can be solved, and there is no fear of deformation.

In addition, coil wires of different metals are lined up in the circumferential direction to form coil bodies of outer or inner layers so that coil wires of the same metal are distributed substantially evenly in the circumferential direction of the cylinder, so that the resistance and dynamic balance are made uniform. In addition, by using aluminum or the like, the weight can be reduced as a whole and the inertia of the ironless armature coil can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an embodiment of the present invention, FIGS. 2 and 3 are perspective views showing a state in which coil wires are arranged in parallel to form a wire sheet, and FIG. 4 is a wire sheet. FIG. 5 is a perspective view of a state in which they are arranged in a cylindrical shape, FIG. 5 is a perspective view of a state in which the inner layer coil body and the outer layer coil body are twisted in the circumferential direction, and FIG. 6 is a perspective view of the ironless armature coil, FIG. 7 is a perspective view of another embodiment. 1 ... Coil wire, 1a ... Copper coil wire, 1b ... Aluminum coil wire, 2 ... Inner layer coil body, 3 ...
... Outer layer coil body, 4 ... Connection conductor

Claims (1)

(57) [Claims] 1. An inner layer coil body and an outer layer coil body in which a large number of axially extending coil wires are arranged in the circumferential direction to form a cylindrical shape and are fitted together and at least one of which is twisted in the circumferential direction. A connecting conductor for connecting the coil strands of the inner layer coil body and the outer layer coil body opposite to each other in the radial direction of the both end faces of the inner layer coil body and the outer layer coil body, the coil strand being formed of a plurality of dissimilar metal coil strands. An ironless armature coil in which the coil wires of the dissimilar metals are arranged in the circumferential direction so that the coil wires are distributed substantially evenly in the circumferential direction of the cylindrical shape.