JPH059655Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic sensor, and relates to a sensor that measures the rotational speed using the magnetic flux of a permanent magnet provided in the rotating part of a rotating machine such as a compressor.

[Conventional technology]

Generally, this type of magnetic sensor is attached to a cover that covers the rotating part of a rotating machine such as a compressor. The method used was to measure the voltage or number of pulses of the electric power to measure the rotational speed of the rotating part.

In this conventional magnetic sensor, as shown in FIG. 5 of the drawing, the winding start wire 2 of the electric wire to be wound around the bobbin body 1 is fixed to the inside of the flange at one end of the winding shaft using insulating tape 3. The wire is wound and the tape 3 is used to prevent the coiled wire from rubbing against the winding start wire 2 and the insulation coating is peeled off. Connect the lead wires. Next, as shown in FIG. 6, the bobbin body 1 with the coil 4 wound thereon and the core 5 are housed in the case body 6, the lead wire 7 is covered with an insulating tube 8, and the coil 4 and the core 5 are held together with a coil holder 9. , the O-ring 10 is fitted into the case body 6, the opening of the case body 6 is caulked and sealed, and then the opening of the case body is covered with a cover body 11 made of resin mold. Ta.

[Problem that the invention attempts to solve]

The conventional magnetic sensor described above has problems in that the tensile strength of the lead wire in the vertical direction is weak, the number of parts is large, the number of work steps is large, and the sensor is expensive.

The present invention was developed in view of the above problems, and provides a magnetic sensor that has high tensile strength in the vertical direction of lead wires, has a small number of parts, can reduce work steps, has a simple structure, and can be obtained at low cost. It is.

[Means for solving problems]

The magnetic sensor of the present invention comprises a bobbin body having a flange formed at one end of a winding shaft portion around which a coil wire is wound, a slit formed up to the outer periphery of the winding shaft portion for inserting a start-of-winding lead wire therethrough, and a lead wire storage portion formed on the outside of this end flange; a coil formed by winding an electric wire around the winding shaft portion and pulling the start-of-winding lead wire from the slit of the bobbin body out into the lead wire storage portion; a core inserted into the winding shaft portion of the bobbin body; a case body that stores the bobbin body; lead wires connecting the start-of-winding lead wire and the end-of-winding lead wire of the coil pulled out into the lead wire storage portion of the bobbin body, respectively, in the lead wire storage portion; and an insulating plate that is pressed into the case body to cover the lead wire storage portion and hold the bobbin body and the core.

[Effect]

The magnetic sensor of the present invention can hold the lead wire at the start of winding the coil without using tape or the like and without peeling off the insulation coating during coil winding. It is held by an insulating plate press-fitted into the body, and the connecting portion between the coil's lead wire and the lead wire is held, thereby increasing the tensile strength of the lead wire in the vertical direction.

〔Example〕

The configuration of an embodiment of the present invention will be described with reference to the drawings.

Reference numeral 21 denotes a coil bobbin body, which is molded from an insulating material such as a synthetic resin, and includes a winding shaft portion 22 around which a coiled wire is wound, and flanges 23, 2 at both ends of the winding shaft portion 22.
4 is integrally formed, and a lead wire storage portion 26 is formed on the outer surface of the collar portion 23 at one end by a substantially circular protrusion 25. Further, a slit portion 28 from the outer circumferential edge to the outer circumferential position of the winding shaft portion 22 is formed in the flange portion 23 and the protruding edge 25 at one end of the bobbin body 21 to draw out the winding start lead wire 27 of the coil electric wire.

Reference numeral 30 denotes a coil, which is formed by winding a coil electric wire such as a copper wire with an insulating coating formed thereon, and starts winding from the slit portion 28 of the flange portion 23 at one end of the bobbin body 21, and inserts the lead wire 27 into the lead wire storage portion 26. After pulling it out, it is wound around the winding shaft portion 22. Then, the lead wires 33 and 34 are connected to the winding start wire 27 and the winding end wire 32 of the coil 30 in the lead wire storage section 26 of the bobbin body 21, respectively, and the lead wires 33 and 34 are connected to the winding start wire 27 and the winding end wire 32 of the coil 30. Route the wire along the inside and lead it to the outside.

Further, the core 31 is inserted into the center of the winding shaft portion 22 of the bobbin body 21.

Reference numeral 35 denotes a case body, in which the bobbin body 21 with the coil 30 wound thereon and the core 31 inserted therein is housed with the lead wire storage section 26 side facing upward.

Next, numeral 36 denotes an insulating plate, which is formed into a substantially disk shape and is press-fitted into the opening of the case body 35 to hold the bobbin body 21 and the core 31. This insulating plate 36 has cutout portions 37 for leading out the lead wires 33 and 34 at its periphery, and a plurality of cutout portions 38 are further formed at its periphery.

39 is a cover formed by resin mold,
The cover body 39 covers the opening of the case body 35, and the resin is filled into the lead wire storage portion 26 of the bobbin body 21.

Next, the operation of this embodiment will be explained.

The winding of the coil wire starts from the slit portion 28 formed in the flange portion 23 at one end of the bobbin body 21.
is drawn out to the lead wire storage section 26, and then the coil wire is wound around the winding shaft section 22 to form the coil 30. Since the coil wire does not rub against the winding start lead wire 27 during this coil winding, the insulation coating of the winding start lead wire 27 and the coil wire will not peel off. Next, the lead wires 33 and 34 are connected to the winding start wire 27 and the winding end wire 32 of the coil 30 in the lead wire storage section 26, and the lead wires 33, 3
4 is routed along the inside of the protruding edge 25 and led out to the outside. Further, the core 31 is inserted through the center of the winding shaft portion 22 of the bobbin body 21.

Next, the coil 30 is wound and the core 31 is wound.
The bobbin body 21 with the attached bobbin body 21 is stored from the top opening of the case body 35 with the lead wire storage part 26 side from which the lead wires 33 and 34 are drawn out facing upward. Then, an insulating plate 36 is press-fitted into the upper opening of the case body 35, and the insulating plate 36 covers the lead wire storage portion 26 and holds the bobbin body 21 and the core 31. In this state, the lead wires 33 and 34 are routed along the protruding edge 25 and led out from the lead-out portion 37, and the tensile strength in the vertical upward direction is maintained. Next, case body 3
Cover the upper opening of body 3 by molding resin.
9 and fix the insulating plate 36, the lead wire storage part 26 is also filled with resin, and the lead wire 3 is fixed.
3 and 34 connections are protected.

[Effect of idea]

According to the present invention, in the bobbin body, a slit portion is formed in the flange portion formed at one end of the winding shaft portion around which the coil electric wire is wound, through which the winding starts and the leader wire is inserted until the outer circumferential position of the winding shaft portion. Therefore, when winding the coil wire, the coil wire will not rub against the lead wire at the beginning of winding, the insulation coating of the wire will not peel off even without using tape, and there will be no leakage. In addition, a lead wire storage part is formed on the outside of the collar part where the slit part of the bobbin body is formed, and winding starts from the slit part of the bobbin body, and the lead wire is pulled out to the lead wire storage part, and the wire is wound around the winding shaft part. A core is inserted into the winding shaft portion of the bobbin body, the bobbin body with the coil wound thereon is stored in a case body, and the coil drawn out into the lead wire storage portion of the bobbin body is wound. Since the lead wire at the beginning and the end of the winding are connected to the lead wire in the lead wire storage section, the joints with the lead wires are protected, and an insulating plate is press-fitted into the case body, so the joints of the lead wires are protected. It covers the bobbin body and the core, increases the tensile strength of the lead wire in the vertical direction, and maintains insulation by press-fitting the insulating plate, eliminating the need for coil retainers, O-rings, etc. , the number of parts can be reduced, further work such as caulking of the case body is not required, the manufacturing process can be reduced, and it can be obtained at low cost.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional front view of a magnetic sensor showing an embodiment of the present invention, Fig. 2 is a plan view of the same before the cover body is formed, Fig. 3 is a perspective view of the above bobbin body, and Fig. 4 is a view of the same as the above coil. FIG. 5 is a perspective view of a part of the bobbin of a conventional magnetic sensor, and FIG. 6 is a longitudinal sectional front view of the same magnetic sensor. 21... Bobbin body, 22... Winding shaft portion, 23...
... Flange section, 26 ... Lead wire storage section, 27 ... Winding start wire, 28 ... Slit section, 30 ... Coil, 31 ... Core, 33, 34 ... Lead wire, 3
5... Case body, 36... Insulating plate.

Claims (1)

[Scope of utility model registration request] A slit portion is formed at one end of the winding shaft for winding the coiled wire, and a slit portion through which the lead wire is inserted is formed at the outer periphery of the winding shaft, and a lead wire is inserted outside the one end of the collar. A bobbin body having a storage portion formed therein, a coil formed by winding a wire starting from a slit portion of the bobbin body, pulling out a lead wire to a lead wire storage portion, and winding an electric wire around a winding shaft portion, and a winding shaft portion of the bobbin body. The core inserted into the bobbin body, the case body that stores the bobbin body, and the winding start wire and winding end wire of the coil drawn out to the lead wire storage portion of the bobbin body are connected at the lead wire storage portion, respectively. A magnetic sensor comprising: a lead wire, and an insulating plate that is press-fitted into the case body, covers the lead wire storage portion, and holds the bobbin body and core.