JPH02119553A - Detector for motor - Google Patents

Abstract

PURPOSE:To facilitate positioning by elastically holding a revolution detecting member on a board with a stator by the use of a resin in the direction of rotation of a rotor so that the revolution detecting member faces the FG magnet of the rotor and movably installing the revolution detecting member in the radial direction. CONSTITUTION:A revolution detecting member 11 is mounted at a location corresponding to the FG magnet 10 of a rotor 7 on a flexible board 1 with a stator 2. A slot 16 in which a circular hole 17 for mounting is lengthened in the radial direction is shaped to the board 1. The hook section 15 of the leg 13 for engagement of the holder 11a of the detecting member 11 is engaged with the circular hole 17. The hook section 15 of a leg 14 for engagement is positioned and fixed to the slot 16 by a resin 18. The lead frame 11b for input- output of the detecting member 11 is soldered to the board 1. Accordingly, the detecting member 11 is positioned easily at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a detection device for a capstan motor used, for example, in a VTR.

[Prior Art] The conventional motor detection device of this kind described above has a configuration as disclosed in, for example, Japanese Utility Model Application Publication No. 100983/1983. That is, as shown in FIGS. 7 and 8, a magnet 10 for detecting the rotation speed is attached to the outer periphery of a rotor that rotatably faces a stator 2 fixed on a substrate 1. One rotation speed detection member facing 10 is fastened and fixed with a screw 2o.

In this detection device, a magnetic pole is inserted into the magnet 10 that rotates together with the rotor 7, and a rotation speed detection member 19 attached to the substrate 1 and facing the magnet 10 detects the magnetic pole and outputs a rotation speed signal. can be detected.

[Problems to be Solved by the Invention] In the conventional motor detection device described above, one rotation speed detection member is fixed onto the substrate 1 with a screw 20, so that the torque of 1 to 1 when screwed together is There are problems that need to be solved, such as a single positioned rotational speed detection member is likely to be misaligned, it is difficult to fix it to the magnet 10 at a predetermined interval, and the fastening screw 20 has a large number of parts. There is.

The present invention has been made to solve the conventional problems, and is therefore a motor detection device in which the rotation speed detection member can be easily fixed to the board, and the position of the rotation speed detection member is less likely to shift and does not require screw parts for fixation. It is because the purpose is to obtain.

[Means for Solving the Problems] A motor detection device according to the present invention includes a rotor that rotatably faces a stator fixed to a substrate, and a magnet for rotation speed detection is attached to the outer periphery of the rotor. In a motor equipped with a rotation speed detection member facing the magnet, the rotation speed detection member is mounted on the board by an expandable and contractible locking member made of resin that has an elastic force holding function in the rotational direction of the rotor. The locking leg is provided in a protruding shape, and the locking leg is movably engaged and stopped along the long hole formed in the substrate in the radial direction of the rotor, and the long hole and the stopper leg are connected to each other by resin. I was able to secure the rotation speed detection member in place by fixing it in place.

[Function] In this invention, the rotation speed detection member can be movably locked in the long hole of the substrate by the elastic force of the stop leg, and the distance from the magnet can be adjusted B3. By hardening the 1st locking leg that is engaged with this with resin, the rotation speed detection member can be fixed without causing any misalignment, and screw parts for fixing the rotation speed detection member are also unnecessary. Become.

[Embodiment] FIGS. 1 to 6 all show an embodiment of the present invention, and the basic configuration of the motor itself is almost the same as the conventional example described above. That is, a stator 2 is fixed to a flexible substrate 1 via a bearing holder 3, and a bearing 4 is installed in the bearing holder 3.
A rotor 7 is arranged on a rotor pulley 6 mounted on an end of a rotary shaft 5 which is rotatably supported by a rotor 7, and faces χ· toward the stator 2. The rotor 7 includes a rotor yoke 8 integrated with a rotor pulley 6, and a drive magnet 9 that faces the outer periphery of the stator 2 with a small interval therebetween. An FG magnet 10 for detecting the rotational speed is attached to the outer periphery of the portion of the rotor yoke 8 where the driving magnet 9 is provided. This FG
A magnetic pole is written on the magnet 10, and is detected as a rotation speed signal by a rotation speed detection member 11 attached to the flexible substrate 1. The rotation speed detection member 11 is held by a resin-made halter 11a, and a plurality of lead frames llb extend from the surface opposite to the surface facing the FG magnet 10. The lead frame 11b is for guiding the input/output current of the rotation speed detection member 11, and is attached to the flexible substrate 1 by one inch of solder. Holder 11a
is made of resin, and each free end side thereof extends outward in the form of a flange on the mounting surface side, and each mounting surface 12 has a pair of protrusions facing in the rotational direction of the rotor. Stop legs 13, 14 each consisting of an integrally formed stop leg 13,14 are integrally formed. The locking leg 13 has a substantially cylindrical shape with opposing protrusions of semicircular cross section having an outwardly projecting hook portion 15 at its free end, and the other locking leg 14 has an outwardly projecting hook portion 15 at its free end. It consists of square, facing protrusions. Each of these locking legs 13, 14 is arranged in the rotational direction of the rotor 7, expands and contracts elastically in the rotational direction, performs a holding action by elastic force, and has a hook portion formed on the outside of the free end side. 15 is used to prevent removal. The flexible board 1 on which the rotational speed detection member 11 is attached has one lock at a position corresponding to the outside of the FG magnet 10 in the radial extension of the rotor 7 with a width smaller than the interval between the locking legs 14. An arc-shaped elongated hole 16 extending longer than the width of the leg 14, and a round hole 17 for fitting the stop leg 13 into the elongated hole 16 in line with the rotational direction of the rotor 7.
has been established. The rotation speed detection member 11 is arranged so that the locking leg 14 faces the long hole 16 of the flexible substrate 1 in the width direction of the long hole 16, and the locking leg 14 is arranged in the long hole so as to face the FG magnet 10. At 16, the locking leg 13
is engaged with the round hole 17 and held by elastic force, and the hook part]
-5 to stop the removal and position the locking leg 14 side in the fixed position by slightly moving the locking leg 13 side using the locking leg 13 side as a fulcrum.
The resin 18 is filled and hardened into the long holes 16 in which the resin 18 is engaged, so that the resin 18 is fixedly attached.

When the rotation speed detection member 11 is removed, the FG magnet 1
0 can be easily adjusted by moving the locking leg 14 with respect to the elongated hole 16 in the holding position. At this time, the retaining action by the elastic force of the locking legs 14 is constantly moving, so the locking legs 14 do not move randomly and positioning is easy.

In FIGS. 5 and 6, square projections are formed facing each mounting surface 12 of the holder 11a, and one locking leg 14 connects the aforementioned locking leg 14 and the long hole 16 to the square long hole 16a. The rotation speed detecting members 11 are installed at one interval similar to the relationship shown in FIG. In this case, the locking leg 14 may be fixed to the long hole 16a by filling the long hole 16a with resin.
As shown in the figure, the hook portion 15 that is engaged with the back surface of the flexible substrate 1 may be bonded to the flexible substrate 1 with resin 18.

Note that the operation of the motor and the rotation speed signal detection movement IY of the rotation speed detection member 11 in the embodiment with the above configuration are the same as those of the conventional example described above, and are widely known, so a description thereof will be omitted. .

[Effects of the Invention] As is clear from the above description of the embodiments, the motor detection device of the present invention includes a magnet for rotation speed detection on the outer periphery of the rotor that rotatably faces the stator fixed to the substrate. In a motor in which a rotation speed detection member facing the magnet is mounted on the substrate, the rotation speed detection member is mounted on the substrate and exerts a holding action by elastic force against the rotational direction of the rotor. Expandable and contractible locking legs made of resin are provided in a protruding shape, and the locking legs are movably engaged and locked in long holes formed in the substrate in the radial direction of the rotor along the long holes. Although the rotation speed detection member is fixed in a fixed position by fixing it in a long hole with resin,
The rotation speed detection member can be movably locked in the long hole of the board by the elastic force of the locking leg, allowing adjustment of the spacing between the magnet and the long hole. By hardening the stopper legs with resin, the rotation speed detection member can be fixed without causing any positional shift.

That is, it is easy to fix the rotational speed detection member to the substrate, and there is an advantage that it is difficult to misalign, and there is no need for screw parts for fixing, which also makes it possible to reduce costs.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a motor as an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing the state in which the rotation speed detection member is installed, and Fig. 3 is an enlarged sectional view showing the state in which the rotation speed detection member is installed. FIG. 4 is an enlarged perspective view showing the relationship between the rotation speed detection member and the flexible substrate, FIGS. Figure 8 is a vertical cross-sectional view and a plan view of a conventional motor, respectively. In Figure 9, 1 is a flexible substrate, 2 is a stator, 5 is a rotating shaft, 7 is a rotor, 10 is an FG magnet, and 11 is a rotation speed sensor. Components, 11a is a holder, 12 is a mounting surface, 13
．． Reference numeral 14 indicates a hair stopper leg, 15 indicates a hook portion, 16.16a indicates a long hole, and 18 indicates resin. In addition, number -n in the middle of the figure is -
or a corresponding portion. Agent: Masuo Oiwa (2 people) Figure 5/Cd 7: 'JM Figure Figure

Claims (1)

[Claims] A rotor rotatably faces a stator fixed to a substrate, a rotation speed detection magnet is attached to the outer periphery of the rotor, and a rotation speed detection member is provided on the substrate opposite to the magnet. In the motor, an expandable and retractable locking leg made of resin is provided in a projection shape on the board mounting side of the rotation speed detection member, and the locking leg is made of resin and has a retaining action by elastic force in the rotational direction of the rotor. The rotation speed detection member is attached by movably engaging and locking the long hole formed in the above board in the radial direction of the rotor along the long hole, and fixing the long hole and the locking leg with resin. A motor detection device characterized by: