JPH0249577Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a ring-shaped iron core in close contact with the inside of a winding frame that has grooves in the axial direction on the outer circumference, and It relates to a coil frame for a magnetic sensor for winding a primary winding between the two grooves, and a secondary winding between another groove on the outside and a groove on the opposite side to the center. Moreover, this coil for a magnetic sensor has a large number of coils using this winding frame housed in a cylindrical case made of a non-magnetic material.

Magnetic sensors are widely used as magneto-electric conversion elements that detect magnetic fields and produce electrical output. One type of magnetic sensor is one that obtains an electrical output by magnetic induction into a coil. One type of this type of sensor has conventionally been used that has a structure shown in FIG. A coil 1 in which a primary winding is wound around a ring-shaped magnetic core is stored in a case or wrapped with tape. A ring-shaped coil 1 made in this way has a cylindrical winding frame 2 having a groove 3 on the opposite side facing the center in the axial direction.
installed in the correct position inside the Further, a secondary winding 6 is wound along the groove 3 of the winding frame 2 and between the groove on the opposite side. Similarly, another secondary winding 6' is wound along the groove 3' in a direction perpendicular to the winding 6. The magnetism detected in the magnetic field causes the secondary winding to generate an electrical output, which is used as the output of the magnetic sensor.

However, this type of coil conventionally used consists of a primary winding wound around a magnetic core, and a coil frame for winding a secondary winding outside the primary winding. Two parts are required and the size is large. In addition, uneven winding of the primary winding or unevenness of the winding layers may cause unevenness on the surface of the winding, making it necessary to leave sufficient space between the primary winding and the secondary winding frame. Moreover, there are many drawbacks such as a deviation in the concentric positional relationship between the primary winding and the secondary winding, which causes an error in the accuracy of the magnetic field measurement direction.

In order to eliminate these drawbacks, the present invention relates to a winding frame used in a magnetic sensor with high measurement accuracy, in which a primary winding and a secondary winding are wound on a single winding frame.

Figure 2 shows a winding frame according to the present invention.As shown in the figure, the outer periphery of a cylindrical plastic or non-magnetic metal frame is divided into four equal parts by primary grooves 4 parallel to the axis and at approximately equal intervals. A secondary groove 5 is provided.

Using this winding frame, as shown in FIG.
A ring-shaped magnetic core 7 is provided in the frame 2 so that its outer shape is in close contact with the inside of the frame 2. A primary winding 8 is wound in the first groove 4 provided in the winding frame between the groove and the inside of the magnetic core. Also, groove 5 _y and groove 5' _y on the opposite side to the center.
A vertical secondary winding 9 is wound between the grooves and the grooves as guides. Further, a horizontal secondary winding 10 is wound between the grooves 5 _x and 5' _x , which are perpendicular to the grooves 5 _y and 5' _y , using these grooves as guides. Third
In the figure, the secondary winding has two windings with a 90° difference between the vertical and horizontal directions, but there are four windings with a 45° winding between these windings. is also possible. In this case, the grooves in which the secondary winding is wound are provided at positions dividing the outer circumference into eight equal parts. It is also necessary that all of the windings applied to these grooves fit within the grooves and do not extend beyond the outer periphery of the frame.

As explained above, in the coil using the winding frame of the present invention, the winding frame 2 also serves as a case for storing the magnetic core 7, so unlike the conventional case, a separate case for storing the magnetic core or a case for insulation protection is used. There is no need for separate tape winding, and it can be used as a small, accurate, and economical magnetic sensor.

When the coil using the winding frame of the present invention is used as a sensor, as shown in the embodiment of FIG. can do. Therefore, by connecting the windings, it is possible to increase the sensitivity of the sensor and improve the measurement accuracy.

The coil winding frame of the present invention has grooves on the cylindrical outer periphery as shown in FIG. 1, but in FIG. It was established. The winding wire wound in the grooves of this winding frame is housed in the grooves 4 and 5 on both end faces, and is not exposed to the outside. Therefore, in the case of a magnetic sensor in which multiple coils are housed in a case as shown in Fig. 4, the coils are in complete contact with each other, making it easy to bond and fix the coils. .

As explained above, when the winding frame of the present invention is used, a compact magnetic sensor with excellent measurement accuracy can be obtained, and its effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram of a conventional magnetic sensor, Fig. 2 is a structural diagram of a winding frame for a magnetic sensor according to the present invention, and Fig. 3 is a structural diagram of a sensor in which the winding frame is wound.
FIG. 4 is a structural diagram of a magnetic sensor in which a plurality of sensors are housed, and FIG. 5 is a structural diagram of a winding frame having grooves on both end faces of the winding frame. In the figure, 2: winding frame, 4: primary groove, 5:
Secondary groove, 7: magnetic core, 8: primary winding, 9: secondary winding, 10: secondary winding, 11: case.

Claims (1)

[Scope of utility model registration request] A plurality of primary winding grooves are provided at regular intervals parallel to the axial direction on the outer circumference of the cylinder, and the outer circumference of the cylinder is divided into four or eight parts symmetrically with respect to the center of the cylinder.
A ring-shaped magnetic core is closely attached to the inner periphery of a coil winding frame made of a non-magnetic material having secondary winding grooves arranged in equal parts, and each of the plurality of primary winding grooves has a corresponding one. A primary winding is placed between the groove and the inside of the ring-shaped magnetic core, and a secondary winding is placed between the secondary winding groove and the groove on the opposite side to the center using the groove as a guide. and the groove on the opposite side to the center and the groove on the opposite side to the center. A magnetic sensor coil made by winding a secondary winding as a guide.