JPH02119554A - Detector for motor - Google Patents

Abstract

PURPOSE:To facilitate positioning by movably installing a revolution detecting member on a board with a stator into a slot in the radial direction so that the revolution detecting member faces the FG magnet of a rotor by the leaf spring of a leg section and elastically holding the revolution detecting member in the direction of rotation. 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 13 in the radial direction is formed to the board 1, leaf springs 12 shaping the leg section of the holder 11a of the detecting member 11 is inserted into the slot 13, and a space with the FG magnet 10 is adjusted. The revolution detecting member 11 is engaged elastically by the springs 12 in the direction of rotation of the rotor 2, and the holder 11a and the flexible board 1 are soldered 14 and fixed. 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 cab stan 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. 5 and 6, a magnet for detecting the rotational speed is installed on the outer periphery of the rotor 7, which rotatably faces the stator 2 fixed on the substrate 1.
The red sea bream sea bream 10 is mounted on the board 1.
A rotation speed detection member 16 facing the rotation speed detection member 16 is fastened and fixed with a screw 17.

In this detection device, magnetic poles are written on the magnet 10 that rotates together with the rotor 7, and the rotation speed detection member 16 attached to the substrate 1 and facing the magnet 10 detects the magnetic poles and detects the rotation speed signal. I can do it.

[Problems to be Solved by the Invention] In the conventional motor detection device described above, since the rotation speed detection member 16 is fixed on the substrate 1 with the screws 17, the rotation speed determined by the torque when tightening the screws is determined. The detection member 16 is easily misaligned, it is difficult to fix it to the magnet 10 at a predetermined interval, and there are problems to be solved, such as the need for fastening screws 17 and a large number of parts.

The present invention was made to solve such conventional problems, and provides a motor detection device in which the substrate I\ of the rotation speed detection member can be easily defined, is less likely to be misaligned, and does not require screw parts for fixing. 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 that is provided with a rotation speed detection member facing the magnet, the substrate mounting f dimension of the rotation speed detection member has a plate spring on the side that performs a holding action by elastic force in the rotation direction of the rotor. The rotor is provided in a shape, and the rotation speed detection member is engaged and held in a long hole formed in the radial direction of the rotor in the substrate by the elastic force of the leaf spring, and is fixed to the substrate by soldering at a fixed position. .

[Operation] In this invention, the rotation speed detection member can be held in the elongated hole of the substrate by the elastic force of the leaf spring, allowing adjustment of the distance between the rotation speed detection member and the magnet. It can be fixed by soldering, eliminating the need for screw parts for fixing.

[Embodiment] FIGS. 1 to 4 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 configured to face the stator 2 on a rotor pulley 6 mounted on an end of a rotating shaft 5 which is rotatably supported by a rotor 7 . The rotor 7 includes a rotor yoke 8 integrated with a rotor pulley 6, and a driving magnet 9 that faces the outer periphery of the stator 2 with a gap therebetween. rotor yoke 8
An FG magnet 10 for rotational speed detection is attached to the outer periphery of the portion where the driving magnet 9 is provided. A magnetic pole is written in this FG mag dimension/soto 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 the holder 1
1a, and a lead frame llb extends to the opposite side of the surface facing the FG magnet 10.

The holder 11a has a pair of leaf springs 12, each of which extends in a corrugated shape and faces each other in the direction of rotation of the rotor 7, on the mounting surface thereof. This leaf spring 12 performs a holding action by elastic force in the rotational direction of the rotor 7.

The flexible substrate 1 on which the rotational speed detection member 11 is attached has a wire at a position outside the FG magnet 10 that has a width smaller than the interval between the leaf springs 12 and extends longer than the width of the leaf springs 12 in the radial direction of the rotor 7. A long hole 13 is opened. The rotation speed detection member 11 is connected to the plate spring 1 in the width direction of the elongated hole 13 with respect to the elongated hole 13 of the flexible substrate 1.
The plate springs 12 are aligned with the elongated holes 13 so as to face the FG magnets 10 and held by elastic force, and are fixedly attached to the flexible substrate 1 by soldering 14 in a fixed position. . FG magnet 10
The lead frame llb extending to the side opposite to the side facing the 0 is soldered to the flexible substrate 1.
When installing the rotation speed detection member 11, the FG magnet 1
0 can be easily adjusted by moving the leaf spring 12 relative to the elongated hole 13. At this time, the holding action by the elastic force of the leaf spring 12 is always working, so positioning is easy and there is no cause for deviation from the set position. Regarding the soldering 14, in one example, the rotation speed detection member 1
1 is installed on the side, but there is no problem in installing it on the opposite side.

Note that the operation of the motor and the rotation speed signal detection operation of the rotation speed detection member 11 in the embodiment with the above configuration are the same as those of the prior art 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 the motor, the rotation speed detection member is mounted on the substrate and the rotation speed detection member facing the magnet is mounted on the substrate, and the rotation speed detection member is attached to the substrate by a leaf spring that exerts a holding action by elastic force in the rotational direction of the rotor. are provided in the shape of legs, and the rotation speed detection member is engaged and held in a long hole formed in the radial direction of the rotor on the board by the elastic force of the leaf spring, and is fixed to the board by soldering at a fixed position. Therefore, the rotation speed detection member can be held in the elongated hole of the board by the elastic force of the leaf spring, allowing adjustment of the distance between it and the magnet, and it can be fixed in place by soldering without causing misalignment. In addition, there is an advantage that there is no need for screw parts for fixing, and costs can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a motor as an embodiment of the present invention, FIG. 2 is a perspective view showing the rotation speed detection member alone, and FIG.
The figure is a partial cross-sectional view showing the installation state of the rotation speed detection member, Figure 4 is an explanatory diagram showing the first system between the positions of the rotor side and the rotation speed detection member, and Figures 5 and 6 are conventional examples, respectively. FIG. 2 is a sectional view and a plan view of the motor. In the figure, 1 is a flexible board, 2 is a stator, 5 is a rotating shaft, 7 is a rotor, 10 is an FG magnet, 11 is a rotation speed detection member, 12 is a leaf spring, 13 is a long hole, and 14 is a soldering part. . Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Figure 3 Figure 4

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, a leg-shaped leaf spring is provided on the board-mounted side of the rotation speed detection member, and the leaf spring is provided in the shape of a leg to perform a holding action by elastic force in the rotational direction of the rotor, and this leaf spring is formed on the board to be long in the radial direction of the rotor. A detection device for a motor, characterized in that the rotation speed detection member is held on a substrate by engaging with the elongated hole, and is fixed to the substrate by soldering at a fixed position.