JP2505184Y2 - Coil winding number inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a coil winding number inspection device used for inspecting the number of windings of a coil that has already been wound and formed.

(Prior Art) To check whether the number of coil turns of a coil that has already been wound and formed actually conforms to the standard, or to check the number of turns of a coil for which the standard is not displayed, perform a destructive inspection. Law and non-destructive inspection method. In the destructive inspection method, the actual coil is unwound and unwound.
If there are a lot of objects to be inspected, it takes a lot of effort and the unwound coil cannot be reused afterwards.

 On the other hand, various nondestructive inspection methods have been developed.

First, there is a method in which a predetermined fluctuating current such as a triangular wave is passed through the coil, the waveform based on the induced electromotive force is analyzed, and the number of coil turns is calculated. However, this has the disadvantage of low accuracy. There is also a method of enlarging the coil winding layer using a magnifying glass, a microscope, a projector, or the like, and counting how many times the coil is wound in each layer. However, this method has a drawback that the inspection time is long.

Therefore, conventionally, a device as shown in FIG. 5 has been developed.

In this device, both ends of a U-shaped magnetic core 1 are projected onto the upper surface of a main body case 2 and a magnetic bridge 1 made of the same magnetic material as the magnetic core 1 forms a loop-shaped magnetic core. While forming the path, the coil 4 to be inspected can be mounted on the path. A reference induction coil 5 is attached to a portion of the magnetic core 1 housed in the main body case 2.

An AC power supply 6 is connected to the coil to be inspected 4, and a voltmeter 8 is connected to the reference induction coil 5.

 This device operates as shown in FIG.

That is, when an alternating current is supplied to the coil to be inspected 4 by using an alternating current power source 6 having a constant frequency, a magnetic flux from the coil to be inspected 4 is formed in the magnetic core 1 and an induced electromotive force is generated in the reference induction coil 5. The number of turns of the reference induction coil 5 is set in advance, and an induced electromotive force proportional to the number of turns of the coil 4 to be inspected is generated in the reference induction coil 5. This is read using the voltmeter 8 and converted into the number of coil turns.

If this device is used, the coil to be inspected 4 with an unknown number of turns is mounted, and the number of turns of the coil is inspected quickly and relatively accurately by the transformation ratio between the coil to be inspected 4 and the reference induction coil 5. can do.

(Problems to be solved by the invention) By the way, there are various shapes of the coil to be inspected.

FIG. 7 shows perspective views of various coils to be inspected which have been conventionally inspected by this apparatus.

The coil to be inspected 4a shown in FIG. 7 (a) has a circular cross section, which is often used for solenoids and the like. Further, the coil to be inspected 4b shown in FIG. 7 (b) is a triangular or fan-shaped coil which is often used for the field of the motor. The coil 4c to be inspected shown in FIG. 7 (c) has a relatively flat cross section, which is often used in relays and the like.

Conventionally, the coil to be inspected 4 having various shapes as described above is mounted on the apparatus shown in FIG. 5 and the number of turns thereof is inspected. As is clear from the figure, the cross sectional shape of the coil is triangular. When it becomes flat or flat, the magnetic core 1 shown in FIG.
However, there is a case where it cannot be inserted into the shaft portion of the coil 4 to be inspected. Further, even if the magnetic core 1 can be inserted into the shaft portion of the coil to be inspected, there is a problem that the gap is large, the leakage magnetic flux is remarkably increased, and the measurement accuracy is lowered.

The present invention has been made in view of the above points, and can be mounted on coils having various cross-sectional shapes, can reduce leakage flux, and can accurately measure the number of coil windings. It is intended to provide.

(Means for Solving the Problems) A coil winding number inspection device of the present invention measures a transformation ratio between a coil to be inspected and a reference induction coil mounted on a magnetic core to measure the winding of the coil to be inspected. In the method of inspecting the number of times, at least a portion of the magnetic core on which the coil to be inspected is mounted is composed of a bundle of a plurality of linear magnetic bodies.

(Operation) In the above apparatus, the portion of the magnetic core on which the coil to be inspected is mounted is composed of a bundle of linear magnetic bodies. Therefore, regardless of whether the cross-sectional shape of the magnetic core is triangular or flat, the magnetic core can be mounted by crushing the bundle of linear magnetic bodies from the side and changing the cross-sectional shape. Moreover, this makes it possible to eliminate air gaps, reduce leakage flux, and accurately measure the number of windings.

(Embodiment) The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of the coil winding number inspection device of the present invention.

The device shown in the figure is the magnetic core 1 of the device already described in FIG.
Is improved, and the same reference numerals are given to the other same portions, and the overlapping description will be appropriately omitted.

In the figure, the magnetic core 10 is formed in a U shape,
It is fixed to the upper surface of the main body case 2 so that both ends thereof protrude. The magnetic core 10 has a bridging plate 3 made of a magnetic material or the like fixed to its upper end surface in order to reduce the magnetic resistance during measurement.

The reference induction coil 5 and the voltmeter 8 housed inside the main body case 2 and mounted on the magnetic core 10 are exactly the same as the conventional one shown in FIG.

On the other hand, the coil to be inspected 4 is provided at one end of the magnetic core 10.
The magnetic core 10 of the portion to which the coil 4 to be inspected is mounted is composed of a bundle of a plurality of linear magnetic bodies 11.

 FIG. 2 shows an enlarged perspective view of an essential part of the magnetic core 10.

As shown in the figure, the magnetic core 10 is made of, for example, a round bar made of soft iron or the like, and a bundle of linear magnetic bodies 11 also made of soft iron and having a sufficiently small outer diameter is fixed to one end surface thereof by welding. There is. These linear magnetic bodies 11 have one end surface fixed to the large-diameter end surface 10a of the magnetic core 10 and the other end, which is a free end, and configured to move freely with respect to each other. Has been done.

FIG. 3 shows a modification of the magnetic core 10 of the device of the present invention.

The magnetic core 10 is entirely composed of a bundle of linear magnetic bodies 11 and is bent into a U shape. The magnetic core 10 having such a structure may be attached to the main body case 2 shown in FIG.

The above device operates in principle in the same manner as the conventional device shown in FIG.

That is, an AC power supply 6 having a constant frequency is connected to the coil to be inspected 4, the voltage induced in the reference induction coil 5 is read by the voltmeter 8, and the number of turns of the coil to be inspected 4 is obtained from the transformation ratio of both.

In this embodiment, the AC power supply 6 is connected to the coil 4 to be inspected and the voltmeter is connected to the reference induction coil 5, but conversely, the AC power supply 6 is connected to the reference induction coil 5. The voltmeter may be connected to the coil 4 to be inspected.

By the way, as described above, when at least the portion of the magnetic core 10 on which the coil 4 to be inspected is mounted is made up of the bundle of linear magnetic bodies 11, as shown in FIG. The coil 4 can be attached.

That is, as shown in FIG. 4 (a), the coil to be inspected 4a having a circular cross section is mounted while the cross section of the linear magnetic body 11 is kept circular. On the other hand, when the coil to be inspected 4b having a triangular section shown in FIG. 4 (b) is mounted, the bundle of linear magnetic bodies 11 is crushed from three directions and mounted so as to have a triangular section. Further, as shown in FIG. 4 (c), a bundle of linear magnetic bodies 11 is crushed from two directions and flattened and attached to the coil to be inspected 4c having a flat cross section.

Here, assuming that all of the coils to be inspected 4a, 4b, 4c have the same opening cross-sectional area, all the coils to be inspected by the deformations shown in FIGS. 4 (a) to (c). The magnetic core will be installed without a gap. This solves the problem that the magnetic core cannot be attached to the coil due to the cross-sectional shape of the coil, and eliminates the gap between the coil and the magnetic core to reduce leakage flux and improve the measurement accuracy. is there.

Note that there are various types of opening cross-sectional areas and cross-sectional shapes of the coil, and it is not always possible to collectively deform the bundle of the linear magnetic bodies 11 of the magnetic core 10 to be mounted. Therefore, for a coil having a small opening cross-sectional area, it is preferable to perform the measurement while reducing the number of linear magnetic bodies inserted in the coil.

In such a case, for example, if the magnetic core 10 as shown in FIG. 3 is used as a bundle of linear magnetic bodies 11, the number of linear magnetic bodies 11 can be appropriately increased or decreased. Can be dealt with.

It should be noted that when the linear magnetic body 11 is reduced, the magnetic resistance increases, so it is necessary to adjust the exciting current so that magnetic saturation does not occur.

 The present invention is not limited to the above embodiments.

The cross section of the magnetic core 10 or the linear magnetic body 11 may be a perfect circle or a flat ribbon,
Also, a rectangular shape may be used.

(Effect of the Invention) In the coil winding number inspection device of the present invention described above, at least the portion of the magnetic core on which the coil to be inspected is mounted is made up of a bundle of a plurality of linear magnetic bodies, so that the coil to be inspected With respect to various types having different cross-sectional shapes, it is possible to change the cross-sectional shape of the bundle of linear magnetic bodies and easily mount the bundle. Moreover, this has the effect of reducing the leakage flux and improving the measurement accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a coil winding number inspection device of the present invention, FIG. 2 is a perspective view of a main part of the magnetic core, FIG. 3 is a perspective view of a modification of the magnetic core, and FIG. a) to (c) are perspective views of a main part when the magnetic core of the present invention is attached to a coil to be inspected, FIG. 5 is a perspective view of a conventional coil winding number inspection device, and FIG.
FIG. 7 is a circuit diagram for explaining the operation principle, FIG.
(C) is a perspective view showing an example of a coil to be inspected by the apparatus of FIG. 1 ... Magnetic core, 2 ... Main body case, 3 ... Bridge plate, 4
…… Inspected coil, 5 …… Reference induction coil, 6 …… AC power supply, 8 …… Voltmeter.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuma Nariyoshi 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Cable Denki Co., Ltd.

Claims (1)

(57) [Scope of utility model registration request] 1. A magnetic core mounted on a magnetic core for measuring the transformation ratio between a coil to be inspected and a reference induction coil to inspect the number of windings of the coil to be inspected, wherein the magnetic core is
At least a portion on which the coil to be inspected is mounted is composed of a bundle of a plurality of linear magnetic bodies, and a coil winding number inspection device.