JPH0625924Y2 - Planar coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a planar coil used in a motor, a signal generator, or the like.

[Conventional technology]

BACKGROUND ART Conventionally, a coil of a motor stator has a stator core formed by stacking silicon steel plates with a copper wire wound around it, or has a non-ferrous core surface printed on a printed circuit board, or
It is composed of a plurality of air-core concentric winding coils arranged in a plane.

[Problems to be solved by the device]

As described above, in the ironless core type stator coil structure formed in a flat shape on the printed circuit board, the magnetic gap length between the rotor magnet and the rotor magnet is large, and therefore the magnetic resistance is large and the motor output has the same shape.・ The disadvantage that it is small for its size,
It has a drawback that the leakage magnetic flux is large.

An object of the present invention is to provide a planar coil that can reduce the magnetic gap length between the rotor magnet and the leakage magnetic flux.

[Means for Solving the Problems]

In order to achieve the above object, the planar coil according to the present invention has a thin copper body spirally arranged to form a copper pattern, and the copper pattern is formed between the copper bodies along the copper body. A thin magnetic material to be interposed is continuously arranged in a spiral shape to form a magnetic material pattern.
A heavy spiral body is formed.

[Action]

Since the spiral copper pattern and the spiral magnetic material pattern are arranged in a plane, it is possible to reduce the magnetic gap length between the spiral magnet pattern and the rotor magnet, thereby reducing the magnetic resistance of the gap, Therefore, it is possible to improve characteristics such as improvement of motor output and reduction of leakage magnetic flux.

Since the magnetic material of the spiral magnetic material pattern is interposed between the copper bodies of the spiral copper pattern, the magnetic conducting material is evenly arranged, the magnetic resistance and the leakage magnetic flux in the entire pattern are reduced, and the torque unevenness is reduced. It is possible to prevent the increase.

In addition, since it has a flat shape as a whole, the overall thickness is extremely small, and since each pattern can be formed by the etching method, the winding work becomes unnecessary.

〔Example〕

An embodiment will be described with reference to the drawings. FIG. 1 shows a plan view of a planar coil 16 according to the present invention, and FIG.
The figure is its cross-sectional shape. Reference numeral 1 is a copper pattern formed in a spiral shape, and 2 is a magnetic material pattern formed in a spiral shape.

That is, the copper pattern 1 is formed by spirally arranging thin copper bodies, and the magnetic material pattern 2 is formed by spirally arranging thin magnetic materials interposed between the copper bodies of the copper pattern 1. It becomes.

The copper pattern 1 is formed on the surface 4 of the insulating film body 3 made of a heat resistant insulating synthetic resin. Specifically, the gap between the conductors and the shape and size of the conductor are precisely formed by the photoetching method. The magnetic material pattern 2 is formed by spirally printing the space between the copper patterns 1 with iron powder or the like.

In this way, since the magnetic material patterns 2 having substantially the same plane shape are closely arranged in a non-contact state along the copper pattern 1 provided in a spiral shape, the copper pattern 1 and the magnetic material pattern 2 have a double spiral shape. A body is formed.

In FIG. 3, the case where the planar coil 16 is applied as a stator coil of the brushless motor 5 is shown.
Reference numeral 8 denotes a rotor fixed to the rotating shaft 9, and one rotor 7 is directly attached to one end of the rotating shaft 9 and the other rotor 8 is attached to the other end thereof via an attaching member 10. The rotating shaft 9 is held by the cylindrical member 11 via bearings 6 and 6. Reference numeral 12 denotes a stator coil assembly, in which a cylindrical member 11 is attached to a hole 13 of the assembly 12, and the assembly 12 is fixed to another member 14 by a fastener 15 such as a screw. There is. The stator coil assembly 12 includes a substantially annular magnetic material substrate 17 and a planar coil 16 as a flat type stator coil attached to both surfaces of the substrate 17.
... is provided. The planar coils 16 are arranged on both surfaces of the magnetic material substrate 17 so as to be at the same position in the circumferential direction when viewed two-dimensionally, and the insulating film body 3 of FIG. Thus, it is fixed to the surface of the substrate 17. Reference numerals 18 and 18 are a pair of flat type rotor magnets, which are arranged at a predetermined interval so as to sandwich the assembly 12. Specifically, the rotor magnets 18 and 18 are shallow dish-shaped rotors 7 and 8. It is fixed to the rotor bodies 19, 19 formed in the above, and faces the planar coils 16 with a minute gap in the axial direction. The rotor magnets 18, 18 are arranged such that the surface facing the planar coils 16 ... N at predetermined center angles corresponding to the circumferential positions of the coils 16.
The poles, S poles, N poles, and S are sequentially magnetized. As shown in FIGS. 4 and 5, the planar coil 16 has both ends A and B of the copper patterns 1 and 1 arranged at the same position in the circumferential direction when the substrate 17 is viewed in plan. C and D are both coils 1
Connect so that 6 and 16 are in series. Substrate 17 in FIG.
The iron pattern 2 on the back side is not shown. A circuit board (not shown) for mounting various electronic components is laminated on the magnetic material board 17. Reference numeral 20 denotes a magnetic sensor attached to one surface of the magnetic material substrate 17. The magnetic sensor detects the rotational positions of the rotor magnets 18, 18, and a control current corresponding to the rotational position is applied to each planar coil.
It is flowed to 16 ……, and this motor 5 rotates. Reference numeral 21 is a small hole (through hole) penetrating the magnetic substrate 17 and the insulating film bodies 3 and 3, and one end B of the copper patterns 1 and 1 on both front and back surfaces,
It is provided to connect D.

By connecting the corresponding planar coils 16, 16 arranged at the same position in the circumferential direction in parallel as shown in FIG. 6, the voltage VE between the ends A, C of the coils 16, 16 becomes
It can be set to 1/2 of the figure. In this way, the rated voltage can be set to two types by changing the wiring.

Since the spiral copper patterns 1 and 1 are formed in a plane, they can be arranged very close to the rotor magnets 18 of the rotors 7 and 8. Therefore, it is possible to prevent various characteristic deteriorations caused by the large void length. Further, since the magnetic material pattern 2 is arranged in the vicinity of the copper pattern 1, the magnetic resistance between the rotor magnet 18 and the coil 16 is reduced, the magnetic flux density between them is increased, and the motor output is increased.

Although not shown, in order to form the planar coil 16, an insulating paper or a synthetic resin plate having a predetermined thickness is interposed between a predetermined thin copper plate and an iron plate, and a roll-shaped one is cut into pieces. However, that is, the same method as the method for manufacturing the slice coil is used.

The material of the magnetic material of the magnetic material pattern 2 includes not only pure iron but also an alloy of cobalt and nickel with iron. Further, the planar coil of the present invention is defined to include a shape obtained by rolling this into a cylindrical shape.

[Effect of device]

Since the present invention is configured as described above, it has the effects described below.

The thickness dimension can be reduced to form a flat shape or a film shape, and it is possible to meet the demand for miniaturization of a motor such as the brushless motor 5.

Winding work is unnecessary, and by photo-etching method,
Highly accurate and high quality planar coil can be obtained, which is suitable for mass production.

It is possible to reduce the magnetic resistance evenly over the entire area of the coil pattern. Further, since the magnetic air gap length can be substantially reduced, it is possible to prevent various characteristic deteriorations due to the large air gap length.

A brushless motor capable of increasing the magnetic force and generating a strong torque regardless of the size is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view, FIG. 3 is a cross-sectional view of essential parts showing a case where this planar coil is used in a brushless motor, and FIG. FIG. 5 and FIG. 6 are enlarged perspective views of an essential part and are explanatory views of a wiring method, respectively. 1 ... Copper pattern, 2 ... Magnetic material pattern

Claims (1)

[Scope of utility model registration request] 1. A thin copper body is spirally arranged to form a copper pattern 1, and a thin magnetic material interposed between the copper bodies of the copper pattern 1 is spirally wound. A planar coil characterized in that a magnetic material pattern 2 is formed by continuously arranging in a circular shape, and a double spiral is formed by the copper pattern 1 and the magnetic material pattern 2.