JPH10243590A - Motor coil and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate large power with small currents by a method wherein each motor coil is composed of a linear member consisting of the layer of material having soft magnetic characteristics and the layer of material having a low electric conductivity. SOLUTION: Coils 5 which are provided between permanent magnets 6 and a stator yoke 2 facing the permanent magnets 6 are composed of spirally formed linear members which respectively consist of layered two coil component members, i.e., coil component members made of material with soft magnetic characteristics and coil component members made of material with a low electric resistivity. The coil component member 5a with soft magnetic characteristics is made of material having a saturation magnetic flux density of not less than 2000 gauss and a coercive force of not larger than 50Oe, particularly permalloy. The coil component member 5b with low electric resistivity is made of material having electric resistivity of not larger than 9.0×10<-8> [Ω.cm], particularly copper. With this constitution, magnetic reluctance between the permanent magnets 6 and the stator yoke 2 is reduced and the densities of fluxes crossing the currents of the coils 5 vertically can be increased. Therefore, the densities of the fluxes applied to the coils 5 are increased, so that a motor which outputs a high power with small currents can be obtained.

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 using the coil.

[0002]

2. Description of the Related Art Conventionally, a coil used for a surface-facing motor or the like has generally been made by applying a so-called winding to an insulating substrate such as polyester. As this method, a method of winding a copper wire by a winding machine and attaching it on an insulating substrate, a method of forming a conductive material such as copper on the insulating substrate by an electroless plating method, and patterning the same by an etching technique. Etc. Such a conventional motor coil only has a function of flowing a current.

[0003]

In order to increase the output of the motor, there are a method of increasing the current flowing through the coil, a method of applying a strong magnetic flux to the coil, and a method of using both of them. The output of the motor is generally expressed by F = B × i × sin θ. Here, F is generated force, B is magnetic flux density, i
Is the coil current, and θ is the angle between the magnetic flux density B and the current i.

Therefore, in order to increase the output (generating force) of the motor, 1) increase the current i, 2) increase the magnetic flux density B, and 3) set the intersection angle θ between the current i and the magnetic flux density B to 90. There is a way to get close to the degree.

However, when designing a motor,
There are restrictions on the outer diameter of the motor, the size of the permanent magnet, the current, and the like, and these restrictions prevent high output.

The present invention has been made in view of the above circumstances, and has as its object to provide a motor capable of generating a high output with a small current and a coil for the motor.

[0007]

A motor coil according to the present invention is characterized in that a linear member formed by laminating a material having a soft magnetic property and a material having a low electric resistance is formed into a spiral shape. And

The motor coil preferably uses a material having a saturation magnetic flux density of 2000 Gauss or more and a coercive force of 50 Oe or less as the material having the soft magnetic property.

The motor coil may be made of a material having a low electric resistance, the electric resistance of which is 9.0 × 10 −8 ohm ··
It is preferable to use a material of less than a meter.

In the motor coil, it is preferable that permalloy is used as the material having the soft magnetic property, and copper is used as the low electric resistance material.

A motor according to the present invention is a motor having a coil sandwiched between a stator yoke and a rotor yoke, wherein the coil is formed by laminating a material having a soft magnetic characteristic and a material having a low electric resistance. The linear member thus formed is formed into a spiral shape.

A motor according to the present invention is a motor having a coil fixed to a stator yoke and a permanent magnet fixed to a rotor yoke opposed to the stator yoke, wherein the coil has a soft magnetic characteristic. A linear member formed by laminating a material having a low electric resistance and a material having a low electric resistance is formed into a spiral shape.

The coil of the motor is preferably made of a material having a saturation magnetic flux density of 2000 gauss or more and a coercive force of 50 oersted or less as the material having the soft magnetic property.

The coil of the motor is made of a material having a low electric resistance, the electric resistance of which is 9.0 × 10 −8 power ohm ·
It is preferable to use a material of less than a meter.

It is preferable that the coil of the motor uses permalloy as the material having the soft magnetic characteristic and copper as the material having the low electric resistance.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor according to this embodiment
The coil disposed between the permanent magnet and the yoke opposed thereto is formed by laminating a material having soft magnetic properties and a material having low electric resistance. By using such a material having soft magnetic characteristics, the magnetic resistance between the permanent magnet and the yoke is reduced, and the magnetic flux density can be increased. Therefore, the magnetic flux density acting on the coil increases, and a motor with higher efficiency than the conventional motor can be manufactured.

Hereinafter, the configuration of a motor according to a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a motor according to a preferred embodiment of the present invention. In the figure, 1 is a motor jacket, 2 is a stator yoke, 3 is a bearing, 4 is a coil fixing board, 5 is a coil, 6 is a permanent magnet, 7 is a shaft, 8 is a stator yoke, and 9 is a shaft fixing portion. It is. The motor as a finished product is obtained by attaching the stator substrate 4 to the stator yoke 2 and inserting the shaft 7 into the bearing 3.

FIG. 2 is an enlarged view of the coil 5. Reference numeral 5a denotes a coil component having soft magnetic properties. As the material, a material having a saturation magnetic flux density of 2000 gauss or more and a coercive force of 50 oersted or less, particularly permalloy, is suitable. 5b is a low electric resistance coil component,
As this material, a low electric resistance material having an electric resistance of 9.0 × 10 −8 power [Ω · m] or less, particularly, copper is preferable. Both ends of the low-resistance coil component 5b are connected to a control circuit (not shown). The coil 5 is preferably formed by laminating at least one layer of the coil component 5a and at least one layer of the coil component 5b. Coil 5
Is formed by forming a linear member composed of laminated coil constituent members 5a and 5b into a spiral and fan shape, and sandwiching an insulating member 5c between the linear members forming the spiral.

According to the motor of this embodiment, since the material forming the coil 5 is formed by laminating a material having a soft magnetic property and a material having a low electric resistance, the material is fixed to the permanent magnet 6. The magnetic flux between the secondary yoke 2, that is, the magnetic flux orthogonal to the current flowing through the coil 5 can be increased. Therefore, the output of the motor is increased as compared with a motor having the same shape, the same permanent magnet, and the same current.

As described above, the generated force of the motor is F = B ×
It is represented by i × sin θ. When this equation is applied to the motor according to the present embodiment, B is the magnetic flux density between the permanent magnet 6 and the stator yoke 2, i is the current flowing through the coil 5, and θ is the magnetic flux density B and the current i of the coil 5. Is the intersection angle with

Next, the effectiveness of the motor according to the above configuration will be described with reference to a specific design example. Here, magnetization of the permanent magnet 6: M = 0.5 [T] Thickness of the permanent magnet 6: tm = 2 [mm] Gap between the permanent magnet 6 and the stator yoke 2: g = 2 [mm] Coil 5 Thickness: tc = 1.5 [mm] The thickness of the coil component 5a: tcm = 0.75 [mm] The thickness of the coil component 5b: tcr = 0.75 [mm] .

If the coil 5 made of a conventional material (material having no soft magnetic properties) is used, the permanent magnet 6
The magnetic flux density (magnetic flux density crossing the current of the coil 5) Bg [T] between the stator yoke 2 and the stator yoke 2 is as follows: Bg = M × tm / (tm + g) Under the above conditions, Bg = 0.25 [T].

On the other hand, like the motor according to the present embodiment,
When the coil 5 is formed by laminating a material having a soft magnetic property and a material having a low electric resistance, the magnetic flux density between the permanent magnet 6 and the stator yoke 2 (magnetic flux density crossing the current of the coil 5) BG In [T], since a part of the gap g is occupied by the coil component member 5a having soft magnetic characteristics, BG = M × tm / (tm + (g−tcr)) = 0.307 [T].

As described above, under the above conditions, the coil 5 is formed by laminating the coil component 5a having soft magnetic characteristics and the coil component 5b having low electric resistance, so that the current orthogonal to the current of the coil 5 is obtained. And the output of the motor can be increased by 23%.

As described above, according to this embodiment,
By forming a coil 5 by laminating a material having soft magnetic properties and a material having a low electric resistance, the magnetic resistance between the permanent magnet 6 and the stator yoke 2 is reduced, and the current is orthogonal to the current of the coil 5. The magnetic flux density can be increased. Therefore, a motor that generates a high torque with a small current can be obtained.

Although the characteristic technical ideas have been described with reference to the specific embodiments, the present invention is not limited to the matters described in the embodiments, but is defined in the appended claims. Various modifications may be made within the scope of the described technical idea.

[0027]

According to the present invention, it is possible to obtain a motor that generates a high output with a small current. Therefore, the size and output of the motor can be reduced.

[0028]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a motor according to a preferred embodiment of the present invention.

FIG. 2 is an enlarged view of a coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor jacket 2 Stator yoke 3 Bearing 4 Coil board 5 Coil 5a Coil constituent member 5b Coil constituent member 5c Insulating member 6 Permanent magnet 7 axis 8 Rotor yoke 9 Axis fixed part

Claims (12)

[Claims] 1. A coil for a motor, wherein a linear member formed by laminating a material having a soft magnetic property and a material having a low electric resistance is formed into a spiral shape. 2. The motor coil according to claim 1, wherein a material having a saturation magnetic flux density of 2000 gauss or more and a coercive force of 50 oersted or less is used as the material having the soft magnetic property. 3. The motor according to claim 1, wherein a material having an electric resistance of 9.0 × 10 −8 ohm-meter or less is used as the low electric resistance material. For coils. 4. The motor coil according to claim 1, wherein permalloy is used as the material having the soft magnetic property, and copper is used as the material having the low electric resistance. 5. A motor in which a coil is sandwiched between a stator yoke and a rotor yoke, wherein the coil is formed by laminating a material having a soft magnetic property and a material having a low electric resistance. A motor having a member formed in a spiral shape. 6. The motor according to claim 5, wherein a material having a saturation magnetic flux density of 2000 Gauss or more and a coercive force of 50 Oe or less is used as the material having the soft magnetic property. 7. The motor according to claim 5, wherein a material having an electric resistance of 9.0 × 10 −8 ohm-meter or less is used as the low electric resistance material. . 8. The motor coil according to claim 5, wherein permalloy is used as the material having the soft magnetic property, and copper is used as the material having the low electric resistance. 9. A motor in which a coil is fixed to a stator yoke and a permanent magnet is fixed to a rotor yoke opposed to the stator yoke, wherein the coil is made of a material having soft magnetic properties and a low electric power. A motor, wherein a linear member formed by laminating a resistance material is formed into a spiral shape. 10. The material having a soft magnetic characteristic includes:
10. A material having a saturation magnetic flux density of 2000 Gauss or more and a coercive force of 50 Oe or less.
A motor according to claim 1. 11. The motor according to claim 9, wherein a material having an electric resistance of 9.0 × 10 −8 ohm-meter or less is used as the low electric resistance material. . 12. The motor coil according to claim 9, wherein permalloy is used as the material having the soft magnetic characteristic, and copper is used as the material having the low electric resistance.