JPS6192153A - Pole detector mounting method of flat motor - Google Patents

Abstract

PURPOSE:To further flatten a flat motor by forming a square hole at the position disposed with a pole detector on a substrate, and burying the detector in the hole, thereby reducing the air gap length between a rotor and the substrate. CONSTITUTION:In a flat motor in which a stator core 1 and a rotor 3 are opposed, a square hole 9 is formed at the portion of a printed substrate 6 opposed to the rotor 3. A pole detector 5 for detecting the pole position of the rotor 3 is buried in the hole 9 so that the surface of the detector 5 substantially coincides with the surface of the substrate 6. The detector 5 is supported onto the substrate by leads 7 of the detector. Thus, an air gap length C' between the substrate 6 and the rotor 3 can be reduced to further flatten it, and the margin of the detector can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for attaching a pole detector to a flat type motor, such as a brushless motor for driving a floppy disk.

[Conventional technology and problems]

A side sectional view of a conventional example of this type of device is shown in FIG. 6, and a view taken along the arrows is shown in FIG.

1 is a stator core made of laminated electrical steel plates, 2 is a stator coil wound around the core 1 to generate a rotating magnetic field, and 3 is a rotary shaft rotatably supported on the left side (not shown), which is perpendicular to the plane of the paper. A permanent magnet 4 is fixed to the inner circumferential surface of the rotor facing the stator core 1 with an air gap in between, and the pole position of the permanent magnet 4 changes with the rotation of the five-place rotor 3. For example, a Hall element (Frequency G
6 is a board equipped with a printed run wire equipped with a member that assists the rotation of this flat motor, 7 is a lead wire for deriving the detection signal of the pole detector 5, and 8 is a This is a hub that supports the stator core 1 and is fixed to the substrate 6.

Figure m8 is a side sectional view of the main part thereof, and the pole detector 5 is disposed on the substrate 6, and its seven lead wires are connected to the lands of the substrate 6 by passing through the holes 10, respectively.

A forming diagram of the pole detector is shown in FIG.

By the way, since the pole detector 5 is placed on the substrate 6, the gap 0 between the rotor 3 and the substrate 6 is
It is the sum of its own thickness A and the gap B between the pole detector 5 and the rotor 3.

That is, O=9+B.

In this type of motor, there is a strong need for flattening, but in this conventional example, there is a problem in that the gap between the rotor 3 and the substrate 6 is large.

[Purpose of the invention]

The present invention provides a method for attaching a pole detector to a flat motor that overcomes the difficulties of the conventional method, improves the means for attaching the pole detector to the board, and reduces the gap between the rotor and the board. That purpose.

[Summary of the invention]

The present invention provides a square hole in the planar shape of the pole detector into which the pole detector can be inserted at the location on the board where the pole detector is positioned, embeds the pole detector in the square hole, and inserts the pole detector through the pole detector lead. This is a method for attaching a pole detector to a flat type motor, in which the pole detector is supported on a board using the same method.

〔Example〕

A side sectional view of the right half of an embodiment of the present invention is shown in FIG.

The same reference numerals indicate the same or corresponding parts in all drawings.

FIG. 2 is a side sectional view of the main part thereof, and FIG. 3 is a forming diagram of the pole detector lead wire.

In the present invention, a square hole 9 into which a pole detector 5 can be inserted is bored in the substrate 6 at a position facing the permanent magnet 4 of the rotating rotor 3.

One of the lead wires 7 of the pole detector 5 is bent and formed into a U-shape as shown in FIG.

Insert the pole detector 5 and its closest lead wire 7 into the drilled hole 7, pass the lead wire outlet through the lead wire hole 10, and connect the end to the land of the board 60 by soldering to detect the pole. The device 5 board 6Fc is mounted and fixed.

At this time, the surface of the pole detector 5 facing the permanent magnet 4 is placed flush with the surface of the substrate 60.

In this way, since the pole detector 5 is embedded in the square hole 9 made in the substrate 6, the gap CI between the substrate 6 and the permanent magnet 4 of the rotor 3 is equal to the gap B' between the pole detector 5 and the permanent magnet 4. be equal.

FIG. 4 is a side sectional view of main parts in another embodiment of the present invention;
FIG. 5 is a forming diagram in which one of the lead wires of the pole detector is formed into an L-shape.

This means that the support means for the pole detector 5 on the substrate 6 is not included in the paper or as an example. The motor can be flattened by the thickness of the motor.

〔Effect of the invention〕

Thus, according to the present invention, by embedding the pole detector in the substrate, the gap between the rotor and the substrate can be reduced, making the motor thinner and flatter, and as a side effect, the frequency output of the pole detector can be increased. Therefore, a large margin can be expected.

Furthermore, there is no need to temporarily fix the pole detector on the board with adhesive, and it can be soldered together with other parts.
This results in a significant reduction in man-hours.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the right half of an embodiment of the present invention in cross section, Fig. 2 is a side sectional view of the main part, Fig. 3 is a forming diagram of the pole detector, and Fig. 4 is the main part of the present invention. FIG. 5 is a formink diagram of the pole detector, FIG. 6 is a side sectional view of the right half of the conventional example, and FIG. 7 is a view taken in the direction of the arrows. Figure 8 is a side sectional view of the main part.
FIG. 9 is a forming diagram of the pole detector. 1... Stator core, 2... Nutator coil, 3...
...rotor, 4...permanent magnet, 5...pole detector, 7 is its lead wire, 6...board, 8...no-pu,
9... Pole detector insertion hole, 10... Lead wire through hole. Applicant's agent Kiyoshi Inomata Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure Ryo S

Claims (1)

[Claims] 1. In a flat type motor in which a pole detector is provided on a printed wiring board, a square hole for positioning the pole detector is made in the board, the pole detector is buried in this square hole, A method for attaching a pole detector to a flat motor, characterized in that the pole detector is attached to a board so that the surface of the board and the surface of the pole detector are approximately at the same height. 2. A pole detector for a flat type motor according to claim 1, wherein the lead wire of the pole detector is molded to support the pole detector on a substrate, and the lead wire is connected to a land on the substrate. Installation method.