JP3709310B2 - Rotation sensor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation sensor suitable for detecting the rotation state of a compressor of a vehicle air conditioner.
[0002]
[Prior art]
As shown in FIG. 4, this type of rotation sensor includes a core 4 made of a metal magnetic material through a center hole 3 of a bobbin 2 around which a coil 1 is wound, and a magnet plate 5 disposed at the tip of the core 4. . Further, one end of the connector 6 is brought into contact with the rear end of the bobbin 2, and a case 7 made of a non-magnetic material is covered from the magnet plate 5 side to be caulked and fixed 8 to the middle portion of the connector 6. The tip of the core 4 is a magnet plate. 5 was simply abutted against. Although not shown, for example, a semi-circular metal magnetic plate fixed to the rotation shaft of the compressor rotates in close proximity to the magnet plate 5 on the distal end side of the case 7, and is applied to the coil 1 according to the rotation speed. An electromotive force is generated.
[0003]
[Problems to be solved by the invention]
However, the electromotive force generated in the coil 1 has a limit, and it has not been possible to increase the output. Further, the magnet plate 5 and the core 4 for forming a magnetic field are in contact with the tip of the core 4 at the center of the magnet plate 5, so that when the case 7 is caulked and fixed 8, the magnet plate 5 is contacted with the contact pressure of the core 4. 5 was easily broken. In view of such a problem to be solved, an object of the present invention is to provide a rotation sensor capable of obtaining a high electromotive force.
[0004]
[Means for Solving the Problems]
As indicated in the claims.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. However, this is merely an exemplary embodiment adopted based on the present invention, and the present invention should not be limitedly interpreted based on matters specific to the embodiment. Rather, the technical scope of the present invention should be determined based on the matters shown in the claims and matters substantially equivalent thereto.
[0006]
In the embodiment shown in FIGS. 1 and 2, a core 14 made of a metal magnetic material such as iron is passed through a center hole 13 of an insulating resin bobbin 12 around which a coil 11 is wound, and a magnet plate ( The rotation sensor has a permanent magnet) 15 and a plate plate 16 made of a metal magnetic material such as iron at the rear end of the core 14. Then, one end of the connector 17 is brought into contact with the rear end of the bobbin 12, and a case 18 made of a non-magnetic material such as aluminum is covered from the magnet plate 15 side to be caulked and fixed 18a to the intermediate portion of the connector 17. The core 14 is passed through the center hole 19 of the magnet plate 15, and the core 14 is further passed through the center hole 20 of the plate plate 16.
[0007]
More specifically, a pair of lead wires (not shown) of the coil 11 are electrically connected to terminals 21 and 21 inserted at the rear end of the bobbin 12, and the terminal 21 is connected to a terminal 22 at one end of the connector 17. So-called press contact connection. The other terminal 21 is also connected to a terminal (not shown) at one end of the connector 17 by so-called pressure contact. Further, the plate plate 16 is inserted into the bobbin 12 through a slit 23 on the rear end side surface of the bobbin 12. Although not shown, for example, a semicircular metal magnetic plate fixed to the rotation shaft of the compressor rotates close to and opposes the magnet plate 15 on the front end side of the case 18, and is applied to the coil 11 according to the rotation speed. An electromotive force is generated.
[0008]
FIG. 3 is a specific example in which an electromotive voltage generated in the coil 11 is measured in correspondence with the presence or absence of the plate plate 16. It is clear that high output can be achieved with the plate plate 16. Further, since the core 14 is passed through the center hole 19 of the magnet plate 15 and the core 14 is passed through the center hole 20 of the plate plate 16, the centering property of the magnet plate 15 and the plate plate 16 is improved, and the formed magnetic field is increased. Can be stabilized and output variation is reduced. Further, when the case 18 is caulked and fixed 18a, the contact pressure of the core 14 does not act on the magnet plate 15, so that the magnet plate 15 is not broken.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention. FIG. 2 is an exploded perspective view of the same. FIG. 3 is a comparative characteristic diagram of an example of the present invention and a conventional example.
11 Coil 12 Bobbin 13 Center hole 14 Core 15 Magnet plate 16 Plate plate 17 Connector 18 Case 18a Caulking and fixing 19 Center hole 20 Center hole

Claims (3)

A rotation sensor in which a core made of a metal magnetic material is passed through a central hole of a bobbin around which a coil is wound, a magnet plate is arranged at the tip of the core, and a plate plate made of a metal magnetic material is arranged at the rear end of the core. In claim 1, one end of the connector is brought into contact with the rear end of the bobbin, and a non-magnetic case is covered from the magnet plate side and fixed to the middle portion of the connector, and the core is passed through the center hole of the magnet plate. Rotation sensor. 3. The connector according to claim 1, wherein one end of the connector is brought into contact with the rear end of the bobbin, and a case made of a non-magnetic material is covered from the magnet plate side and fixed to the middle portion of the connector, and the core is formed in the center hole of the plate plate. Threaded rotation sensor.

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