JPH0534221Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a small DC coreless motor used in the audio and video fields.

Conventional Technology In recent years, as devices using DC coreless motors have become smaller and thinner, there has been a demand for smaller and thinner motors themselves, and there has also been a demand for lower manufacturing costs. ing.

Such a conventional DC coreless motor will be explained based on FIGS. 9 to 11.

That is, in FIG. 11, reference numeral 50 denotes an upper frame constituting the frame of a DC coreless motor having an opening at the bottom. A rotary shaft 52 is rotatably held in the center of the upper frame 50 via a bearing 51. There is. This rotating shaft 52 has a
A resin plate 54 is provided with a plurality of coils 53 concentrically held at the center thereof, and a commutator 55 having a plurality of commutator pieces respectively connected to the coils 53 is arranged on one side of the resin plate 54. It is set up. A lower frame 57 is provided at the lower part of the upper frame 50 to rotatably hold the lower end of the rotating shaft 52 via a bearing 56. The lower frame 57 is provided with a magnet 58 at a position facing the coil 53, and is further provided with a plurality of brushes 59 brought into contact with the commutator 55.

Here, the resin plate 54 held on the rotating shaft 52 and the commutator 55 constitute a rotor, and the lower frame 57 on which the magnet 58 and the brush 9 are placed, and the upper frame 50 constitute a stator.

Next, regarding the coil 53 and commutator 55, the ninth
The explanation will be given based on the figure and FIG. 10.

The plurality of coils 53 are formed by winding coated copper wires 53a and adhering the coated copper wires 53a to each other.Furthermore, each of the coils 53 is connected with a coated copper wire 53b. 53 and the connection portion between each coil 53 is held by a resin plate 54.

Then, on one side (lower side) of the resin plate 54, the rectified 5
5 and a connection board 60 are provided, and each coil 53 and commutator piece 55a of the commutator 55 is connected to the coated copper wire 5.
3a, and further, the commutator piece 55a and the commutator piece 55b on the opposite side are connected via a copper foil 60a provided on a wiring board 60. Further, a fixing plate 61 for fixing the resin plate 54 to the rotating shaft 52 is provided on the surface of the resin plate 54 on which the commutator 55 is not provided.
has been established.

Problems to be Solved by the Invention However, in such a conventional configuration, as shown in FIG. 9b, the coil 53 requires stacking a plurality of windings made of coated copper wire 53a and bonding between each winding. Since a predetermined shape cannot be formed, the thickness and outer diameter of the coil 53 are limited by the diameter of the coated copper wire 53a, which limits the height and outer diameter of the motor, making it difficult to miniaturize. Also,
Since the coil 53 is formed by winding the coated copper wire 53a, there are problems in that the work is complicated and the manufacturing cost is high.

This invention solves these problems,
The present invention provides a DC coreless motor in which the coil can be made thinner, the motor can be made smaller and thinner, the coil can be easily formed, and the manufacturing cost can be reduced.

Means for Solving the Problems In order to solve the above conventional problems, the present invention
A plurality of coils held on a substrate provided on a rotating shaft are composed of thin film conductors provided on the substrate by plating.

Effects According to the present invention, the coil is formed of a thin film conductor with the above configuration, so that the thickness of the coil itself can be reduced, and furthermore, the thickness of the substrate holding the coil can be reduced. Therefore, it is possible to make the DC coreless motor thinner and smaller. In addition, since the thin film conductor is formed by plating and held on the board to form the coil, there is no need to wind coated copper wire to form the coil as in the past, improving productivity and reducing manufacturing costs. can be done.

Embodiment An embodiment of the present invention will be described below based on FIGS. 1 to 8.

1 to 4 show a first embodiment of the present invention, and in FIGS. 1 to 4, 1 is an upper frame, 2 is a bearing, 3 is a rotating shaft, 6 is a commutator, 6a is a commutator piece, 6b is a commutator piece on the opposite side of 6a, 7 is a bearing, 8 is a frame lower frame, 9 is a magnet, 10 is a brush, 11 is a wiring board,
Reference numeral 12 denotes a fixing plate, and since the above configuration is the same as that of the conventional example, a description thereof will be omitted.

The characteristic configuration of this embodiment is that a plurality of coils 5 made of thin copper foil formed by plating are provided on both sides of a substrate 4 provided on a rotating shaft 3. That is, as shown in FIG. 1, the copper foil 5 is spirally wound from the starting point 4a of the coil 5 on the back surface of the substrate 4 to the coil connection hole 4b provided in the substrate 4.
A is formed on the surface of the substrate 4, and a copper foil 5a is formed in a spiral shape on the surface of the substrate 4 in correspondence with the copper foil formed on the back surface of the substrate 4.
The coil 5 is formed by electrically connecting the copper foil 5a on the back and front surfaces of the coil 5, and the other coils have the same configuration. Then, the end of the spiral copper foil 5a on the surface of the board 4 is connected to the end of the spiral copper foil 5a forming each coil 5 using the copper foil 5b to form a connection between each coil 5. are doing. In addition, the copper foil 5c provided on the part 4a on the back surface of the substrate 4, which is the starting point of the coil 5, and the commutator piece 6a of the commutator 6 are connected to the copper wire 13.
The circuit is connected as shown in FIG. 3. Note that the copper foil 5 is coated on the surface of the copper foils 5a and 5b.
A protective agent is applied to protect parts a and 5b.

As described above, in this embodiment, each coil 5 is formed with the copper foil 5a provided on the substrate 4, and the connection portion between each coil 5 is formed with the copper foil 5b provided on the surface of the substrate 4. Therefore, the coil 5 and the substrate 4 can be made thinner than conventional ones. In addition, each coil 5 is formed by providing copper foils 5a and 5b on the substrate 4 by plating, and there is no need for the complicated work of winding coated copper wire in layers as in the conventional method, reducing manufacturing costs. It is possible to reduce this amount and improve productivity.

Next, a second embodiment of the present invention will be described based on FIGS. 5 and 6.

The differences between this embodiment and the first embodiment are as follows:
Portion 4a on the substrate 4 that is the starting point of each coil 5
The copper foils 5c at the starting point 4a are provided up to the portions located below the commutator pieces 6a, and the copper foils 5c at the starting point 4a and the commutator pieces 6a are directly connected.

This simplifies the wiring work between the coil 5 and the commutator 6, thereby improving productivity.

Further, the commutator piece 6a is connected to the substrate 4 via the copper foil 5c.
, the holding force between the commutator 6 and the substrate 4 can be strengthened.

Next, a third embodiment of the present invention will be described based on FIGS. 7 and 8.

The difference between this embodiment and other embodiments is that a copper foil 5d is provided from the copper foil 5c for direct connection to the commutator strip 6a to a position below the commutator strip 6b on the opposite side of the commutator strip 6a. , a copper foil 5e is provided below the commutator piece 6b for direct connection to the commutator 6b.

As a result, the connection between the commutator pieces 6a and 6b can be made on the board 4, and there is no need to provide a connection board separately from the board 4, reducing the number of parts and manufacturing costs. can improve sex.

Effects of the invention As is clear from the above explanation, the invention uses a thin film conductor formed by plating to form the coil installed on the substrate held on the rotating shaft. , the coil and substrate can be made smaller and thinner, and at the same time, resin molding required for conventional coils is no longer required. Therefore, it is possible to obtain an excellent DC coreless motor that can reduce the size and thickness of the motor and reduce its cost, and improve productivity.

[Brief explanation of the drawing]

Fig. 1a is a bottom view of the coil and substrate in the first embodiment of the present invention, and Fig. 1b is the - of Fig. 1a.
Fig. 1c is a plan view, Fig. 1d is an enlarged view of part A in Fig. 1a, Fig. 1e is a cross-sectional view taken along line 1.
This is an enlarged view of part B in Figure b. Figure 2a shows the bottom part of the rotor in the same embodiment, and Figure 2b shows the bottom part of the rotor in the same embodiment.
3 is a circuit diagram of the rotor, and FIG. 4 is a longitudinal sectional view of the DC coreless motor according to the present invention. Fig. 5a is a bottom view of the horn and the substrate in the second embodiment of the present invention, Fig. 5b is a sectional view taken along the line -' of Fig. 5a, Fig. 6a
is a bottom view of the rotor in the same embodiment, FIG. 6b is a sectional view taken along the line -' in FIG. 6a, and FIG. 7a is a bottom view of the coil and substrate in the third embodiment of the present invention.
Fig. 7b is a sectional view taken along the line -' of Fig. 7a, Fig. 8a is a bottom view of the rotor in the same embodiment, Fig. 8b
is a sectional view taken along the line -'. FIG. 9a is a bottom view showing the coil portion in a conventional DC coreless motor, FIG. 9b is a sectional view taken along the line -' in FIG. 9a, and FIG. 9c is an enlarged view of the C portion in FIG. 9b. 1st
Figure 0a is a bottom view of the rotor in the same motor, the first
0b is a sectional view taken along the line -' of No. 10a, and FIG. 11 is a longitudinal sectional view of the same motor. 1... Frame upper frame, 2, 7... Bearing,
3... Rotating shaft, 4... Board, 5... Coil, 5
a, 5b, 5c, 5d, 5e...Copper foil, 6...Commutator, 6a, 6b...Commutator piece, 8...Frame lower frame, 9...Magnet, 10...Brush.

Claims (1)

[Claims for Utility Model Registration] 1. A substrate 4 provided on the rotating shaft 3, a plurality of coils 5 provided on at least one side of the substrate and connected to each other, and a plurality of coils 5 provided on the rotating shaft and connected to each of the coils. A DC coreless motor comprising a rotor including a commutator 6 having a plurality of commutator pieces 6a and 6b connected to each other, and a rotor in which the plurality of coils 5 are formed of a thin film conductor 5a plated on at least one side of a substrate 4. . 2. A DC coreless device according to claim 1 of the utility model registration claim, comprising a rotor in which the connection portion between each commutator piece 6a, 6b and each coil 5 is formed of a thin film conductor 5c formed by plating on the substrate 4. motor. 3. Utility model registration claim 1 or 2, comprising a rotor in which the connection portion between each commutator piece 6a, 6b is formed by thin film conductors 5d, 5e formed by plating on the substrate 4. DC coreless motor.