KR100908523B1 - motor - Google Patents

Abstract

The present invention aims to reduce the cost of the motor by reducing the amount of copper used in the motor, and in order to realize the above-mentioned problem, the conductive wire for forming the coil 413 of the armature 41 ( 413a uses aluminum for the main conductor part 413a1, and comprises the copper coating part 413a2 which coat | covers the main conductor part 413a1 with copper. By using aluminum for the main lead portion 413a1, the amount of copper used can be reduced. Moreover, the armature 41 becomes one rigid body by the resin molded object 43 shape-molded with a resin material.

Description

Motor {MOTOR}

FIG. 1: is a typical cross section which cut | disconnected the axial direction as showing one form of the Example of the motor which concerns on this invention.

Fig. 2 is a plan view of the armature according to the present invention as viewed from above.

Fig. 3 is a schematic cross-sectional view showing one form of the conductor wire of the armature according to the present invention, where a) shows a cross section of the conductive wire and b) shows a schematic perspective view.

4 is a schematic cross-sectional view showing the toothed cover portion of the insulator of the present invention in the axial direction.

5 is a cross-sectional view schematically showing another connection structure between the armature and the circuit board according to the present invention.

Fig. 6 shows a conventional armature, which is a plan view seen from above.

Explanation of symbols on the main parts of the drawings

1: motor 2: rotor

3: bearing part 4, 4a: fixed body

41, 41a: armature 411: armature core

411a: tooth 411b: core back part

412: Insulator 412a1: End cover part

412a2: Side cover part 412a3: Curved part (edge part)

413: coil 413a: conductive wire

413a1: main lead part 413a2: copper clad part

413a3: insulation coating 414: connecting pin

42, 42a: circuit board 43: resin molded body

The present invention relates to a motor and in particular to an armature.

Conventionally, a coil is formed in the armature of a motor by winding the conductive wire which covered the copper wire with the insulating film in multiple layers. By passing a current through such a conductive line, a rotating magnetic field for rotating the rotating body of the motor is generated.

6 shows a structure of a conventional armature, which is a plan view of a conventional armature viewed from above.

Referring to FIG. 6, the armature 100 has a plurality of teeth 111 extending toward a predetermined central axis J2 and a core back portion 112 connecting the teeth 111 in the circumferential direction. The armature core 110 and the coil 120 formed by winding the conductive wire 121 in a plurality of layers on each of the plurality of teeth 111 are provided. On the surface of the armature core 110, an insulating layer (not shown) is covered by pre-molding, spool, or powder coating (see Patent Document 1 for an example of such a conventional armature).

[Patent Document 1] Japanese Patent Laid-Open No. 2002-186203

However, since the conductive wire 121 forming the coil 120 has a structure in which copper wire is covered by an insulating coating, the amount of copper used is very large. In addition, with the development of the current industry, the consumption of copper is showing a dramatic increase worldwide, and, accordingly, the unit price of copper is greatly increased. On the contrary, electric appliances are becoming low in power consumption, and low currents in motors are required. For this reason, in the motor, the current is reduced by increasing the number of turns (number of turns) of the teeth. In addition, the demand for lower prices is increasing in electrical appliances. Therefore, the price reduction of a motor was an essential subject. However, in order to realize a low current of the motor, many conductive wires are required, and therefore, copper having a high unit cost must be used, which has been an obstacle to reducing the cost of the motor.

This invention is made | formed in view of said subject, and the objective is to implement | achieve a low price of a motor by reducing the usage-amount of copper.

According to claim 1 of the present invention, there is provided a motor having a rotating body rotating about a predetermined rotating shaft, and a fixed body having an armature rotatably supporting the rotating body and generating a rotating magnetic field. The coil is formed by winding a plurality of teeth extending toward the rotation axis and arranged radially, a core back portion connecting the plurality of teeth, and a conductive line consisting of a single line around the teeth. The electrically conductive wire which consists of the said single wire | wire is a copper clad aluminum provided with the main conductor part which consists of aluminum or an aluminum alloy, the copper coating part which coat | covers the said main conductor part, and the insulation coating part which coat | covers the said copper coating part. It is characterized by being a line.

According to Claim 1 of this invention, by using a copper clad aluminum wire for a conductive wire, the usage-amount of copper can be reduced compared with the case where a copper wire is used for the conductive wire which consists of single wire | wire. Thus, it is possible to provide an inexpensive motor.

According to claim 2 of the present invention, the armature according to claim 1, wherein the armature has a plurality of connecting pins connected to each end of the conductive wire formed of the disconnection, and an end of the conductive wire formed of the disconnection and the connection The pin is fixed by soldering.

According to claim 2 of the present invention, the copper-clad aluminum wire is coated with copper on the main lead portion of aluminum, so that the connecting pin and the solder joint can be soldered. If only aluminum wire is used, aluminum cannot be soldered, so complicated processes such as welding are required.However, if copper-coated aluminum wire is used, the connection with the connection pin can be performed using only a convenient bonding process called soldering. The manufacturing cost can be further reduced.

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According to claim 4 of the present invention, the armature is molded by a resin material.

According to claim 4 of the present invention, the armature is molded from a resin material, so that the whole armature can be regarded as one rigid body. Therefore, not only the vibration in each tooth part can be suppressed, but also the vibration as an armature whole can be suppressed.

According to claim 5, the circuit board according to claim 1, wherein a circuit board for controlling rotation of the rotating body is disposed under the armature, and an end portion of the conductive wire made of the single wire is solder-bonded to the circuit board. It is characterized in that it is electrically connected.

According to claim 5 of the present invention, by using a copper-clad aluminum wire for a conductive wire made of a single wire, it is possible to solder-bond a circuit board and a conductive wire made of a single wire. In particular, when only aluminum wire is used, solder joints with the circuit board are impossible, and complicated joining processes such as welding are necessary. However, the copper-clad aluminum wire can be bonded to the circuit board by a convenient joining process called solder joint, and thus the manufacturing cost can be further reduced.

According to claim 6 of the present invention, the armature and the circuit board are molded by a resin material according to claim 5.

According to claim 6 of the present invention, the armature and the circuit board can be regarded as one rigid body by molding the armature and the circuit board. Therefore, not only the vibration in each tooth portion can be suppressed, but also the vibration of the armature as a whole can be suppressed.

According to the seventh aspect of the present invention, the insulating coating portion in the conductive wire made of the single wire is formed by polyester modification.

According to the seventh aspect of the present invention, the heat resistance of the insulating coating can be improved by using polyester modification in the insulating coating portion of the conductive wire made of a single wire. In addition, the use of polyester modification on the insulating coating allows connection of the polyester-modified portion and the solder during soldering of the conductive wire made of a single wire, so that the copper coating can be electrically conductive without being melted by solder. Wire soldering is possible. Therefore, the conductivity of the conductive wire which consists of disconnection can be improved, and work | work can be made easy.

<Overall Structure of Motor>

One embodiment of a motor according to the present invention will be described with reference to FIG. 1. BRIEF DESCRIPTION OF THE DRAWINGS It is typical sectional drawing which cut | disconnected one form of the Example of the motor which concerns on this invention in the axial direction.

According to FIG. 1, the motor 1 includes a rotating body 2 that rotates about a rotating shaft J1, a bearing part 3 that rotatably supports the rotating body 2, and a bearing part 3. ) And a fixture (4) having an armature (41) for generating a rotating magnetic field of the rotor (2).

The rotating body 2 extends coaxially with the rotating shaft J1, and is a shaft 21 serving as the center of rotation, and a direction perpendicular to the shaft 21 and the rotating shaft J1 (hereinafter, simply referred to as a “diameter direction”). Rotor magnets 22 arranged at intervals to generate rotational torque of the rotating body 2, and a connecting member 23 formed of a resin material and connecting the shaft 21 and the rotor magnets 22 to each other. It is provided.

The stationary body 4 includes an armature 41, a circuit board 42 disposed below a direction along the axis of rotation J1 of the armature 41 (hereinafter, simply referred to as an “axial direction”), and an armature ( 41 and the resin molded part 43 which integrally mold the circuit board 42 by a resin material, and the bearing part which is molded integrally with the resin molded part 43 and arranged on both sides in the axial direction. (3) is provided with a bearing retainer (44) having a cylindrical portion (441).

The bearing holders 44 are formed on both sides of the connecting member 23 of the rotating body 2 in the axial direction, respectively. In each cylindrical portion 441, a ball bearing 31, which is a bearing portion 3, is in contact with and fixed to the shaft 21.

A current flows from the external power source (not shown) through the circuit board 42 to the armature 41, so that a rotating magnetic field is generated in the armature 41. By the interaction of this rotating magnetic field and the rotor magnet 22, the rotating body 2 rotates about the rotating shaft J1.

<The structure of the armature>

Next, the structure of the armature 41 of this invention is demonstrated, referring FIGS. Fig. 2 shows a form of an embodiment of an armature according to the present invention, which is a plan view seen from above. 3 is a schematic cross-sectional view showing one embodiment of the conductive wire 413a of the present invention. 3A shows a cross section of the conductive line 413a, and b) is a schematic perspective view of the conductive line 413a. 4 is a cross-sectional view schematically showing the toothed cover portion of the insulator of the present invention in the axial direction. 5 is a cross-sectional view schematically showing another embodiment of the connection structure between the conductive line and the circuit board in the axial direction.

According to FIG. 2, the armature 41 includes a plurality of teeth 411a extending toward the rotational axis J1 and a core back portion 411b for connecting the radially outer side of the plurality of teeth 411a in the circumferential direction. The armature core 411 having two layers, two insulators 412 covering the armature core 411 on both sides in the axial direction, and the teeth 411a are formed by a conductive line 413a on the outside of the insulator 412. It is provided with a coil 413 wound around.

At the radially inner circumferential edge of each tooth portion 411a, a circumferential extension portion 411a1 extending to both sides in the circumferential direction is formed.

Each insulator 412 includes a toothed cover portion 412a that covers the axial end surface of the tooth portion 411a, the outer circumferential surface of the side surface and the circumferential extension portion 411a1, and an axial end surface of the core back portion 411b. It has a core back cover part 412b which covers the radially inner peripheral side and the inner peripheral surface of the core back part 411b. Each insulator 412 is molded by injection molding a resin material having electrical insulation properties. In addition, the toothed cover portion 412a and the core back portion 412b are integrally formed.

In each insulator 412, an inner circumferential wall 412c and an outer circumferential wall 412d extending along the axial direction are formed on the inner circumferential side and the outer circumferential side of the tooth portion 411a, respectively. By such an inner circumferential wall 412c and an outer circumferential wall 412d, the winding state of the coil 413 can be prevented from being collapsed.

Referring to FIG. 3, the conductive wire 413a includes a main lead portion 413a1 formed of aluminum, a copper coated portion 413a2 formed of copper covering the outer circumference of the main lead portion 413a1, and a copper coated portion ( An insulating coating portion 413a3 formed of an insulating resin such as polyurethane covering the outer circumference of the 413a2) is provided. In particular, in the present embodiment, the thickness of the copper coating portion 413a2 in the radial direction relative to the diameter of the main conductor portion 413a1 is about 15%.

According to FIG. 4, the toothed cover portion 412a of the insulator 412 includes a cross-sectional cover portion 412a1 covering the end surface of the tooth portion 412a and a side cover portion 412a2 covering the side surface of the tooth portion 411a. Is formed. And the curved surface part 412a3 which is an edge part is formed in the position which connects the end surface cover part 412a1 and the side cover part 412a2. By the curved portion 412a3, the conductive line 413a can increase the radius of curvature of the conductive line 413a when it is wound from the upper surface of the tooth portion 411a to the side surface. Therefore, a large stress can be prevented from applying to the conductive line 413a. In particular, since the conductive wire 413a of the present embodiment uses aluminum for the main conductive portion 413a1, mechanical strength is lowered as compared with general copper wire. Therefore, when a large stress is applied when the conductive wire 413a is wound around the tooth portion 411a, the main conductor portion 413a1 may break. In particular, the greatest stress is applied to the conductive line 413a to the bending of the conductive line 413a when the conductive line 413a is wound from the upper surface of the tooth portion 411a to the side surface. However, the curved portion 412a3 is formed at a position corresponding to the connection portion between the upper surface and the side surface of the tooth portion 411a of the insulator 412, so that the curvature radius can be increased when the conductive line 413a is bent. Therefore, it is possible to wind the teeth 412a satisfactorily without applying stress when the conductive wires 413a are bent.

2, a plurality of connecting pins 414 are arranged in the insulator 412 spaced apart in the circumferential direction (four in the embodiment). 1, the plurality of connection pins 414 are electrically and mechanically connected to the circuit board 42 by soldering. Moreover, the edge part of the conductive wire 413a and the connection pin 414 are each connected by solder joint. Accordingly, the conductive line 413a and the circuit board 42 are electrically connected through the connecting pin 414. Here, when the conductive wire is made of only aluminum, it is necessary to use a complicated joining method such as welding. However, although the main conductor 413a1 is made of aluminum, the copper coating portion 413a2 is formed in the main conductor 413a1, whereby solder joint can be realized. Therefore, a convenient joining method such as solder joint can be adopted without using a joining method such as welding. As a result, connection of the conducting wire part 413a and the connection pin 414 can be made easy, and manufacturing cost can be reduced.

In addition, the conductive wire 413a can make the conductive wire 413a lighter than the general copper wire by forming the main conductive part 413a1 from aluminum. Therefore, since each coil 413 can be reduced in weight, the weight of the armature 41 itself can be reduced in weight. In addition, as the armature 41 is reduced in weight, vibration of the armature 41 is concerned in a motor having a large rotational torque. In particular, when the conductive wire 413 is intensively wound, the coil 413 is lightened, so that an increase in vibration of each tooth 411a is concerned. However, in the present invention, since the whole armature 41 is molded by the resin material, the armature 41 and the resin molded part 43 can be regarded as one rigid body. Therefore, since the vibration of each tooth 411a can be suppressed, and it arises as the vibration of the armature 41 and the whole resin molding part 43, the vibration of the armature 41 can be suppressed.

5, the conductive wire 413b is directly solder-bonded with the circuit board 42a. The solder joint is enabled by extending the end of the conductive line 413b to a land portion (not shown) formed by the copper foil of the circuit board 42a. At this time, the conductive wire 413b is not held by the other member between the coil 4131 and the circuit board 42a, and moves freely. Therefore, there is a possibility that the solder joint portions of the conductive line 413b and the circuit board 42a are displaced, and the conductive line 413b itself may be disconnected.

However, in the present invention, after soldering and joining the conductive wire 413b and the circuit board 42a, the armature 41a and the circuit board 42a are molded from a resin material to form an integral stator 4a. have. Therefore, since the conductive line 413b between the coil 4131 and the circuit board 42a is held so as not to move freely by the resin material, there is a possibility that the solder joint portions of the conductive line 413b and the circuit board 42a are shifted. In addition, the possibility that the conductive wire 413b itself is disconnected can be prevented.

As mentioned above, although the Example of this invention was described, this invention is not limited to the above-mentioned Example, A various deformation | transformation is possible within a Claim.

For example, in the embodiment of the present invention, aluminum is used for the main lead portion 413a1 of the conductive wire 413a. However, the present invention is not limited thereto, and an aluminum alloy may be used instead of aluminum, for example.

For example, in the embodiment of the present invention, an insulating resin such as polyurethane is used for the insulating coating portion 413a3 of the conductive wire 413a, but is not limited thereto. In particular, the insulating coating portion 413a3 is preferably molded from an insulating resin containing polyester modification. As a result, the heat resistance temperature of the conductive line 413a can be improved, and a large current can flow through the conductive line 413a. And even when the motor is used in a high temperature environment, high reliability can be obtained. As a result, the design freedom and the application range of the motor can be widened. In addition, since the polyester modified portion and the solder can be connected at the time of solder joint of the conductive wire 413a, the solder wire of the conductive wire 413a can be soldered without the need to melt the copper coating 413a2 by soldering. Become. Therefore, the conductivity of the conductive line 413a can be improved, and the connection work of the conductive line 413a can be easily performed.

Further, for example, in the embodiment of the present invention, the conductive wire 413a is solder-bonded with the circuit board 42a and the connecting pin 414, but the present invention is not limited to the solder joint of these members. The wires may be connected to each other by solder joints.

In addition, the present invention is not limited to a brushless motor, but can be applied to a general motor according to another driving method such as an induction motor, a series motor, and the like.

According to the present invention, the cost of the motor can be reduced by reducing the amount of copper used.

Claims (7)

As a motor, A rotating body rotating about a rotation axis, and A fixed body rotatably supporting the rotating body and having an armature for generating a rotating magnetic field, The armature, A plurality of teeth extending radially and disposed toward the rotation axis; A core bag connecting the plurality of teeth, It has a coil formed by winding a conductive wire consisting of a single line around the teeth, The conductive wire which consists of the said disconnection, A main lead portion made of aluminum or an aluminum alloy, A copper coating portion covering the main lead portion; A motor, characterized in that the copper-clad aluminum wire having an insulating coating covering the copper coating. The method of claim 1, The armature has a plurality of connecting pins connected to each end of the conductive wire formed of the single wire, An end portion of the conductive wire made of the single wire and the connecting pin are fixed by soldering joint. delete The method of claim 1, A motor characterized by covering the entire outer portion of the tooth section, except for the inner diameter of the armature that has been wound with a conductive wire, with a resin material. The method of claim 1, Under the armature, a circuit board for controlling the rotation of the rotating body is disposed, An end portion of the conductive wire made of the single wire is electrically connected by soldering to the circuit board. The method of claim 5, And the armature and the circuit board are molded by a resin material. The method of claim 1, The said insulating coating part of the electrically conductive wire which consists of the said disconnection is shape | molded by polyester modification. The motor characterized by the above-mentioned.

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