JPS5926787Y2 - Installation structure of armature coil in DC motor - Google Patents

Description

[Detailed Description of the Invention] The present invention proposes a structure in which the armature coil is fixedly arranged so that it is perpendicular to the direction of the magnetic field formed by the permanent magnets installed in the rotor. In particular, the present invention relates to an optimal armature coil mounting structure applied to a flat type brushless DC motor.

Recently, various flat brushless DC motors have been developed, but they still have a number of problems and are still in the process of development.

FIG. 1 shows the principle of an example of a conventional flat brushless DC motor.

To explain this briefly below, the rotor of this electric motor consists of an upper rotating plate 1 to which permanent magnets are attached, and this upper rotating plate 1.
and a lower rotary plate 2 integrally constructed via a rotary shaft 3.

A printed circuit board 4 with three coils 5 attached thereto is inserted between the upper rotary plate 1 and the lower rotary plate 2 as shown in the figure, and the printed circuit board 4 is fixed at an appropriate position on the stator side. , which constitutes part of the stator.

In this case, the coil 5 is fixed to the printed circuit board 4 by a method such as fitting into a hole made in the same shape as the outer shape of the Y coil 5, and each winding start lead is Connect the terminal to the printed circuit board 4
In order to connect to the conductive pattern 6 above, it must cross the top surface of the coil 5 as shown.

Naturally, this increases the thickness of the stator in the direction of the rotation axis, which increases the gap between the permanent magnets and the coil 5, which is not desirable.

Particularly when the coil 5 is formed by spirally winding a rectangular wire many times (the width of the rectangular wire is equal to the height of the coil body).

) Since a large twist occurs when the lead terminal at the beginning of winding is connected to the printed wiring across the top surface of the coil 5, the thickness of the flat coil 5 serving as a stator in the rotation axis direction is increased accordingly. .

Not only does this greatly increase the thickness, but also there is a risk that the insulating coating of the winding of the coil 5 may be peeled off due to twisting, resulting in a short circuit.

The above is a 3-coil type electric motor, but when trying to configure a 6-coil type electric motor with 3-phase switching using such a configuration, it is necessary to arrange the coils at 60 degree intervals. It is necessary to stack the armature coil assemblies shown in FIG. 1 in two stages, one above the other.

However, since even one stage already has the above-mentioned problems, if two stages are superimposed in this way, the structure becomes extremely complicated.

Moreover, the increase in thickness of the coil due to the winding across the coil is doubled.

In view of these problems, the applicant of the present application filed the U.S. Pat.
No. 11477 proposes a new armature coil mechanism.

As shown in FIG. 2, this invention is a flat coil installation having, for example, three coils 7 constituting an armature coil, and an opening 8 forming an opening penetrating in the direction of the magnetic field for installing the coils 7. A plate 9 and a lead attachment portion 10 formed to extend inward in the opening 8 of the mounting plate 9 in a band shape are respectively provided, and at least the winding start terminal of the coil attached to the coil attachment plate is connected to the lead attachment portion 10. 3 connected to the lead attachment part 10 and attached to another coil attachment plate.
When combined with two coils, for example, the lead attachment portion 1
0 is bent and placed in the gap between three other coils.

By doing so, the coil lead wires can be easily processed and a thinner motor can be provided.

The present invention is a further improvement of this invention, and
With respect to the one mentioned at the beginning, (a) a plurality of armature coils arranged so that the flat direction thereof is perpendicular to the direction of the magnetic field, and housing and holding the armature coil in an opening penetrating in the direction of the magnetic field; (b) having a conductive pattern and covering a side surface of the coil of the motor according to the armature method, which has a conductive pattern and is housed and held in the opening of the coil mounting plate; Each of the plurality of coil mounting plates is provided with a flexible printed circuit board in which a plurality of coil connection parts are connected in series via a connecting part, and the plurality of coil mounting plates are provided in a layered manner, and at least one side of each of the plurality of coil mounting plates is provided with a flexible printed circuit board. A coil connecting portion of the flexible printed circuit board, which is layered with the plurality of coil mounting plates and bent at the connecting portion, is arranged and formed at a position corresponding to a terminal location of the armature coil. The present invention is characterized in that the terminals at predetermined locations of the conductive pattern at the coil connection portion of the flexible printed circuit board are connected.

Therefore, according to the present invention, the coil can be held more reliably without increasing the thickness of the button in the direction of the rotation axis, and the connection between the coil and the drive circuit can be more streamlined.

An embodiment in which the present invention is applied to a flat DC brushless motor will be described below with reference to the drawings.

1. The flexible printed circuit board 11 for connecting the coils of the motor and the drive circuit will be explained. As shown in FIG. It is composed of a position detection element connecting portion 14 having a shape, and a single drive circuit mound portion 15 having a rectangular shape.

The pair of coil connecting parts 12 and 13 are connected to each other in a series via a connecting part, and one coil connecting part 12 and the position detection element connecting part 14 are connected to each other in a series through a connecting part 17. ing.

Furthermore, a connecting portion 18 is connected to the connecting portion 17, which is perpendicular to the connecting portion 17 and is connected to the drive circuit mount portion 15.

In this way, the flexible printed circuit board 11 is integrally constructed.

A circular hole 19 into which a rotating shaft is inserted is provided in the pair of twisted coil connecting portions 12.13.

A predetermined conductive pattern 20 is formed on the flexible printed circuit board 11, which is integrated by the connecting portions 16.1γ and 18.

Note that this flexible printed circuit board 11 has a thickness of approximately 50 mm.
μ synthetic resin, for example about 35μ on a polyester base
It is made of a conductive layer of copper, is extremely flexible, and has a total thickness of 100 μm or less.

As shown in FIGS. 4 and 5, the motor is of a two-pole, three-phase type, and uses six flat coils.

That is, it is composed of three upper coils 21 and three lower coils 22.

These coils 21 and 22 are spirally wound rectangular wires each having a flat rectangular cross section, and the width of the rectangular wire is equal to the height of the coils 21 and 22.

The upper three coils 21 are attached to permanent magnets 4, which will be described later, each formed by three openings 24 in a flat coil mounting plate 23 having the same thickness as the height of the coils 21.
The coils 21 and the coil mounting plate 23 are housed and held in respective openings penetrating in the direction of the zero magnetic field, and the coils 21 and the coil mounting plate 23 are bonded and bonded to each other.

Similarly, the three lower coils 22 are housed and held in the openings formed by the three openings 26 of the flat coil mounting plate 25, which penetrate in the direction of the magnetic field of the permanent magnet 40, and are bonded together by adhesive. ing.

Three openings 24 on the mounting plate 23 and 3 on the mounting plate 25
Each of the two openings 26 is continuous.

The winding start terminal 27 button and winding end terminal 28 of the three coils 21 held on the mounting plate 23 are coil connections that cover the sides of the coils 21 stored and held on the coil mounting plate 23 of the flexible printed circuit board 11, respectively. It is connected to predetermined locations of conductive patterns 20 formed at positions corresponding to locations 27 and 28 of the coil 21 in the portion 12, and is configured to supply current to the coil 21 through these conductive patterns 20. ing.

Similarly, the winding start terminal 27 and winding end terminal 28 of the three coils 22 held on the mounting plate 25 are respectively coils that cover the sides of the coils 22 stored and held on the coil mounting plate 25 of the flexible printed circuit board 11. Connection part 1
It is connected to predetermined locations of the conductive pattern 20 formed at positions corresponding to the terminals 27 and 28 of the coil 22 in No. 3.

In addition, the mounting plate 23 and the coil connection portion 12, and the mounting plate 2
5 and the coil connecting portion 13 are arranged in a layered manner and are bonded and bonded to each other with an adhesive.

Next, talking about the position detection element, this position detection element uses three Hall elements 29. These Hall elements 29 detect the phase of the rotor, and based on this, the six coils 21 and 22 are The current is switched and supplied sequentially.

These Hall elements 29 are housed in three notches 31 formed in a ring-shaped position detection element mounting plate 30 at a distance of 66' from each other, and are bonded together by adhesive.

These Hall elements 29 are also connected to the conductive pattern 20 formed on the position detection element connection portion 14 of the flexible printed circuit board 11.

Further, this position detection element connecting portion 14 is bonded to the bottom surface of the position detection element mounting plate 30.

Next, let's talk about the motor drive circuit 1.
The drive circuit is constituted by components (not shown) mounted on the drive circuit mount section 15 of the flexible printed circuit board 11, and these circuit components are connected to the six coils 21, 22 and three Hall elements 29 to perform predetermined operations.

A board 32 made of phenol resin for reinforcement is connected to the back surface of the drive circuit mount section 15 of the flexible printed circuit board 11 of the octopus.

Next, the assembly of the coils 21 and 22 and the Hall element 29, which are connected by the drive circuit and the flexible printed circuit board 11 as described above, will be described.As shown in FIG. A coil mounting plate 25 holding the three coils 22 by bending at the angle is arranged so as to be stacked on the lower side of the coil mounting plate 23 holding another coil 21.

Note that if the connecting portion 16 is bent with a small curvature, there is a risk that the conductive pattern 20 of the connecting portion 16 will be disconnected.
It is a good idea to pinch it into this part, glue it, and peel it off.

When the mounting plates 23 and 25 are stacked vertically in this manner, the coils 21 and 22 are arranged one above the other, and furthermore, these coils 21 and 22 are arranged in the rotational direction of the motor. They are arranged offset from each other by 66).

Next, the flexible printed circuit board 11 is bent at the connecting portion 17, and the position detection element mounting plate 30 holding the Hall element 29 is placed thereon so as to overlap the coil mounting plate 23.

As a result, the three Hall elements 29 are connected to the three coils 21.
It will be placed above.

A motor incorporating the coils 21, 22 and Hall element 29 configured as described above is shown in FIG. 7, for example.

That is, the rotating shaft 34 is disposed passing through the ring-shaped position detection element mounting plate 30 and the pair of coil mounting plates 23,25.

This rotating shaft 34 is rotatably supported by a radial bearing 36 and a thrust bearing 37 attached to a casing 35 of the motor.

An upper disk 39 forming a magnetic path is fixed to the rotating shaft 37 via a cylindrical support 38, and is configured to rotate together with the rotating shaft 34.

Four permanent magnets 40 are fixed to the lower surface of this disk 39.

These permanent magnets 40 are alternately magnetized to north and south poles.

The lower disc 4 also forms a magnetic path at the lower end of the rotating shaft 34.
1 is fixed.

A magnetic field in the axial direction of the rotating shaft 34 is formed by the pair of discs 39, 41 and the permanent magnet 40, and the Hall element 2
When the current is sequentially switched based on the phase detection by the rotating shaft 34, the pair of discs 39 and 41, and the permanent magnet 4,
The rotor consisting of 0 and 0 rotates in response to the rotational force.

In Naoto's motor, the connecting portion 17 of the flexible printed circuit board 11 protrudes outside the casing 35 through the opening 42, and by pinching this portion, the position detecting element connecting portion 14 and the position detecting element mounting plate 30 are circumferentially separated. It is configured such that the Hall element 29 can be correctly positioned by rotationally adjusting the direction.

As shown by the imaginary line in FIG. 3, if a notch 43 is provided in the connection part 17 of the flexible printed circuit board 11, the position detection element connection part 14 of the flexible printed circuit board 11 can be rotated more easily, and the Hall element can be easily rotated. 290 rotation adjustment becomes even easier.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention. For example, in the above embodiment, 7 drive The circuit is provided in a rectangular drive circuit mount part 15 that is integrally connected to the flexible printed circuit board 11 via a connecting part 18, and this drive circuit mount part 15 is arranged as shown in FIGS. Alternatively, it may be formed continuously on the outer periphery of the coil connecting portion 12.

In this case, a pair of fan-shaped substrates 32 made of phenolic resin may be placed on the outer periphery of the coil connection portion 12 and on the lower surface of the drive circuit mount portion 15.

In the above embodiment, the present invention is applied to a two-pole, three-phase DC brushless motor, but the present invention is not limited to this, and can be applied to various types of DC motors.

In summary, according to the present invention, since the armature coil is housed and held in an open opening penetrating the coil mounting plate in the direction of the magnetic field, the coil can be held securely and accurately positioned.

Further, the coil connection portion of the flexible printed circuit board that covers the side surface of the armature coil housed and held in the opening of the coil mounting plate is arranged in a layered manner on at least one side of the coil mounting plate, so that the armature coil Since the terminal is connected to a predetermined location of the conductive pattern at the coil connection part of the flexible printed circuit board, which is formed at a position corresponding to the terminal location of the coil, the lead wire is connected to the top or bottom surface of the coil. There is no need to cross the motor, and for this reason, the thickness of the motor can be reduced by that amount.

Moreover, since the flexible printed circuit board has multiple coil connection parts connected in series through the connection part and is bent at the connection part, the armature coil is stored in the opening of the coil mounting plate. Coupled with the holding, assembly of the coils is facilitated and the positional relationship of the coils to each other is accurately defined.

Since the terminals of the small armature coil are connected to the conductive patterns on the flexible printed circuit board, if the drive circuit components are mounted on this flexible printed circuit board, the connection between this coil and the drive circuit becomes very easy. , it is also advantageous in terms of space.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the main parts of a conventional flat brushless motor.
FIG. 2 is an exploded perspective view showing the installation of an armature coil of another flat type brushless motor. 3 to 7 show an embodiment of a flat type DC brushless motor to which the present invention is applied, FIG. 3 is a plan view of the flexible printed circuit board 11, and FIG. 5 is a plan view of the same, FIG. 6 is a perspective view of the assembled state, and FIG. 7 is a vertical sectional view of the motor. FIG. 8 and FIG. 9 show a modification of the above embodiment, and FIG.
The figure is a plan view of a flexible printed circuit board 11 of a modified example.
FIG. 9 is a perspective view of the assembled state. The symbols used in the drawings include: 11 is a flexible printed circuit board, 12.13 is a coil connection part, 16 is a connecting paper, 20 is a conductive pattern, 21.22 is a coil, 23 is a coil mounting plate, 24. 26 is an opening, 25
27 is a coil mounting plate, 27 is a terminal at the beginning of winding, 28 is a terminal at the end of winding, 39 is an upper disc, 40 is a permanent magnet, and 41 is a lower disc.

Claims (1)

[Claims for Utility Model Registration] The installation of the armature coil in a DC motor in which the armature coil is fixedly arranged so as to be orthogonal to the direction of the magnetic field formed by the permanent magnets provided on the rotor is (a) a plurality of flat coil mounting plates arranged such that their flat directions are perpendicular to the direction of the magnetic field, and housing and holding the armature coils in openings penetrating in the direction of the magnetic field; (b) a flexible printed circuit board having a conductive pattern and connecting a plurality of coil connecting parts in series via connecting parts, covering the side surface of the armature coil that is housed and held in the opening of the coil mounting plate; The plurality of coil mounting plates are provided in a layered manner, and at least one side of each of the plurality of coil mounting plates is folded at the connecting portion in a layered manner with the plurality of coil mounting plates. A coil connecting portion of the flexible printed circuit board is disposed, and the terminal is located at a predetermined location of the conductive pattern at the coil connecting portion of the flexible printed circuit board formed at a position corresponding to a terminal location of the armature coil. The installation of the armature coil in a DC motor is characterized by the connection of the structure.