JP2003037009A - Method for magnetizing magnetized pulser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetization method of a magnetized pulser, which can improve the pitch precision of a magnetic pole and which can improve magnetizing force. SOLUTION: Magnetic flux 4 which a magnetizing yoke 7 generates passes through a prescribed part in the circumferential direction of a circular laminate 3 to a circular steel plate 1 side from an elastic magnetic layer 2 side. Thus, magnetizing force can be improved as compared to a conventional case where magnetic flux passes from an elastic magnetic layer side to the elastic magnetic layer side. Since magnetic pole parts 5 and 6 forming the N-pole and the S-pole of the magnetizing yoke 7 face each other by sandwiching the prescribed part in the circumferential direction of the circular laminate 3 from both sides of the elastic magnetic layer 2 side and the circular steel plate 1 side, the density of the magnetic flux 4 which passes from the elastic magnetic layer 2 side to the circular steel plate 1 side can be enhanced, and especially, magnetizing force can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of magnetizing a magnetizing pulsar which constitutes a rotation speed sensor used in, for example, an ABS (antilock brake system) of an automobile.

[0002]

2. Description of the Related Art Conventionally, the magnetizing method of a magnetizing pulser is roughly classified into an all-pole magnetizing method and a single-pole magnetizing method.

The all-pole magnetizing method is to simultaneously apply a magnetic flux to the elastic magnetic layer alternately passing through the elastic magnetic layer in the opposite direction over the entire circumference of the elastic magnetic layer laminated on the steel plate ring. Is a method of simultaneously forming all of the N-pole region and the S-pole region lined up over the entire circumference in the circumferential direction of the elastic magnetic layer. This all-pole magnetizing method has an advantage that the magnetizing over the entire circumference is promptly completed, and since the magnetizing yoke for generating the magnetic flux can be directly brought into contact with the elastic magnetic layer for magnetizing. There is a merit that the layer can be strongly magnetized.

However, in this all-pole magnetizing method, the N-pole region is formed due to the eccentricity between the elastic magnetic layer laminated on the steel plate ring and the magnetizing yoke and the dimensional error of the magnetizing yoke itself. There is a drawback that the accuracy of cumulative pitch with the south pole region is reduced.
This decrease in pitch accuracy causes a decrease in rotation speed detection accuracy.

On the other hand, in the above-mentioned single pole magnetizing method, as shown in FIG. 3, the magnetizing yoke 33 is arranged in a predetermined neutral zone at a predetermined gap with respect to the elastic magnetic layer 32 laminated on the annular steel plate 31. The magnetizing yoke 3
The magnetic flux 37 from the N pole 35 to the S pole 36 of 3 penetrates the elastic magnetic layer 32. As a result, the S pole region 38 and the N pole region 40 are formed in the elastic magnetic layer 32. Next, the ring 44 composed of the annular steel plate 31 and the elastic magnetic layer 32 is rotated by a predetermined angle so that the magnetizing yoke 33 faces the neutral zone 45 adjacent to the neutral zone 34 and the coil 41. Power supply 42 connected to
The direction of is changed to the direction drawn by the broken line in FIG. As a result, the N pole 35 of the magnetizing yoke 33 becomes the S pole 35, the S pole 36 becomes the N pole 36, the direction of the magnetic flux 37 is reversed, and a new N pole region adjacent to the previous S pole region 38 is formed. 43
Is formed.

As described above, in the single pole magnetizing method, the ring 44 is sequentially rotated by a predetermined angle, and the direction of the magnetic flux generated by the magnetizing yoke 33 is sequentially reversed to thereby make the S pole. The region and the N-pole region are magnetized one by one in order. With this single-pole magnetizing method, it is possible to avoid a decrease in cumulative pitch accuracy due to eccentricity of the magnetizing yoke in the all-pole magnetizing method described above. By controlling, it is possible to improve the cumulative pitch accuracy of the S pole region and the N pole region.

However, in this single pole magnetizing method, it is necessary to relatively rotate the magnetizing yoke 33 and the ring 44.
Due to the provision of a predetermined gap between the magnetizing yoke 33 and the ring 44, the magnetizing force is reduced as compared with the all-pole magnetizing method described above.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetizing method for a magnetizing pulsar which has a high magnetic pole pitch accuracy and can improve the magnetizing force.

[0009]

In order to achieve the above object, a method of magnetizing a magnetizing pulsar according to a first aspect of the present invention is characterized in that the elastic magnetic layer of a laminate comprising a steel sheet and an elastic magnetic layer is laminated on the elastic magnetic layer. A method of magnetizing a magnetizing pulsar which alternately forms magnetic pole areas having opposite polarities, wherein a magnetic flux penetrating the laminate from the elastic magnetic layer side to the steel plate side is added to a predetermined portion of the laminate. A first step of forming one magnetic pole area in the elastic magnetic layer, and a magnetic flux in a direction opposite to the magnetic flux is added to a predetermined portion of the laminated body adjacent to the magnetic pole area and adjacent to the magnetic pole area. It is characterized in that the second step of forming magnetic pole areas of opposite polarity is alternately repeated.

In the method of magnetizing the magnetizing pulsar according to the present invention, the position of the magnetic flux penetrating the laminated body is moved by a predetermined dimension, and the direction of the magnetic flux is reversed so that the elasticity of the laminated body is improved. In the magnetic layer, magnetic pole areas having opposite polarities are alternately formed one by one. By such single pole magnetization,
The cumulative pitch accuracy of each magnetic pole area can be improved.

Further, in this magnetizing method, since the magnetic flux penetrates a predetermined portion of the laminated body from the elastic magnetic layer side to the steel plate side, the magnetic flux penetrates from the elastic magnetic layer side to the elastic magnetic layer side. The magnetizing force can be improved as compared with the conventional example.

[0012] According to a second aspect of the present invention, there is provided a method of magnetizing the magnetic pulser according to the first aspect of the present invention, wherein in the method of magnetizing the magnetic pulser according to the first aspect, a predetermined portion of the laminate is located on the elastic magnetic layer side. The N-pole and the S-pole of the magnetizing yoke are arranged so as to face each other so as to be sandwiched from both sides on the side of the steel plate, and the magnetic pole area is formed.

According to the invention of claim 2, the magnetizing yoke has N
Since the pole and the S pole are opposed to each other with the predetermined location of the annular laminate sandwiched from both sides of the elastic magnetic layer side and the steel sheet side, the density of the magnetic flux penetrating from the elastic magnetic layer side to the steel sheet side is Can be increased. Therefore, in particular, the magnetizing force can be improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings.

An embodiment of a method of magnetizing a magnetizing pulser according to the present invention will be described with reference to FIG. In this embodiment,
Annular laminate 3 in which the elastic magnetic layer 2 is laminated on the annular steel plate 1
Was used as a magnetizing yoke 7 having magnetic pole portions 5 and 6 arranged so as to be sandwiched from both sides of the elastic magnetic layer 2 side and the annular steel plate 1 side. In FIG. 1, the annular laminated body 3 is partially shown in the circumferential direction, and as a whole, the elastic magnetic layer 2 forms an outer peripheral surface and the annular steel plate 1 forms an inner peripheral surface. It is a state. The elastic magnetic layer 2 is made of, for example, a material in which magnetic powder is mixed with synthetic rubber or synthetic resin.

The magnetizing yoke 7 is generally U-shaped, and the magnetic pole portions 5 and 6 are tapered. The magnetic pole portions 5 and 6 are provided at predetermined positions in the circumferential direction of the annular laminated body 3,
The surface of the elastic magnetic layer 2 and the surface of the annular steel sheet 1 are opposed to each other with a predetermined gap.

The magnetizing yoke 7 becomes a magnetic core by passing a current through the coil 10 wound around the winding portion 8,
A magnetic path for passing magnetic flux is formed across the space between the magnetic pole portions 5 and 6. When the power supply 11 is connected as in the circuit shown by the solid line in FIG. 1, the magnetic pole portion 5 becomes the N pole and the magnetic pole portion 6
Becomes the S pole. Therefore, at this time, as shown in FIG. 1, the magnetic flux (lines of magnetic force) 4 from the N pole magnetic pole portion 5 sequentially penetrates the elastic magnetic layer 2 and the annular steel plate 1 to reach the S pole magnetic pole portion 6. On the other hand, when the power supply 11 is connected as in the circuit shown by the broken line in FIG. 1, the magnetic pole portion 5 becomes the S pole and the magnetic pole portion 6 becomes the N pole. Therefore, at this time, the magnetic flux 4 from the magnetic pole portion 6 having the N pole to the magnetic pole portion 5 having the S pole penetrates the annular steel plate 1 and the elastic magnetic layer 2 in order.

In this embodiment, in the state shown by the solid line in FIG. 1, the magnetizing yoke 7 generates a magnetic flux 4 which penetrates the annular laminate 3 from the elastic magnetic layer 2 side to the annular steel plate 1 side.
One magnetic pole area 12 of the elastic magnetic layer 2 is magnetized to the S pole to form the S magnetic pole area 12.

Next, after disconnecting the circuit of the power source 11, the annular laminated body 3 is rotated by a predetermined angle (for example, 360 ° × 1/96) about the central axis, As indicated by a broken line in FIG. 1, the power supply 11 is connected in reverse to generate a magnetic flux (line of magnetic force) penetrating the annular laminate 3 from the annular steel plate 1 side to the elastic magnetic layer 2 side and magnetize the S pole. The magnetic pole area 13 adjacent to the magnetic pole area 12 is magnetized to the N pole.

Thereafter, each time the annular laminated body 3 is rotated by a predetermined angle, the connection of the power source 11 is reversed to magnetize the magnetic pole areas adjacent in the circumferential direction one by one to the opposite polarities. Thus, when the annular laminated body 3 makes one rotation, a plurality of (for example, 96) magnetic pole areas 12, 13 ... Arranged on the entire circumferential surface 2A of the elastic magnetic layer 2 so that the polarities alternate in the circumferential direction. Can be formed. The rotation angle of the annular laminated body 3 can be controlled with high accuracy by a servo motor, and the pitch error in each magnetic area can be reduced.

According to this embodiment, the magnetizing yoke 7 is used.
The magnetic flux (magnetic flux) generated by the magnetic flux penetrates a predetermined position in the circumferential direction of the annular laminate 3 from the elastic magnetic layer 2 side to the annular steel plate 1 side, so that the magnetic flux penetrates from the elastic magnetic layer side to the elastic magnetic layer side. The magnetizing force can be improved as compared with the example.

Further, in this embodiment, the magnetic pole portions 5 and 6 forming the N pole and the S pole of the magnetizing yoke 7 are provided at predetermined positions in the circumferential direction of the annular laminated body 3 on the elastic magnetic layer 2 side and the annular steel plate. Since they are opposed to each other on both sides of the first side, the density of the magnetic flux penetrating from the elastic magnetic layer 2 side to the annular steel sheet 1 side can be increased, and particularly, the magnetizing force can be improved.

In the above embodiment, as shown in FIG. 1, the case where the drum-shaped annular laminated body 3 is magnetized to manufacture a radial magnetized type magnetized pulsar ring has been described. The magnetizing method can also be applied to the case where an axial magnetizing type magnetizing pulsar ring as shown in FIG. In this case, with the magnetic pole portions 5 and 6 of the magnetizing yoke 7 of FIG. 1, the flat ring-shaped elastic magnetic layer 2 laminated on the flange portion 22 of the tubular annular steel plate 21 and the end surface 22A thereof.
The annular laminated body 24 composed of 3 and 3 is arranged so as to be sandwiched from both sides in the axial direction. Then, as in the above-described embodiment, while rotating the annular laminated body 24 by a predetermined angle by using a high-precision servo motor or the like, as shown partially in FIG. The areas 25, 26 ... Are sequentially magnetized in opposite polarities to produce a magnetized pulser ring in which magnetic pole areas 25 of N poles and magnetic pole areas 26 of S poles are alternately arranged. Further, in the above embodiment, the elastic magnetic layer 2 laminated on the annular steel plate 1 is magnetized, but the elastic magnetic layer 2 is laminated on the flat steel plate 1 and the elastic magnetic layer 2 is magnetized.
The steel plate 1 may be formed into a ring shape.

[0024]

As is apparent from the above, the method of magnetizing the magnetizing pulsar according to the invention of claim 1 moves the position of the magnetic flux penetrating the laminated body by a predetermined dimension and reverses the direction of the magnetic flux. Then, the magnetic pole areas of opposite polarities are alternately formed one by one in the elastic magnetic layer of the above-mentioned laminated body. By such single pole magnetization, the cumulative pitch accuracy of each magnetic pole area can be improved. Further, in this magnetizing method, the magnetic flux penetrates a predetermined portion of the laminated body from the elastic magnetic layer side to the annular steel plate side, so that the magnetic flux penetrates from the elastic magnetic layer side to the elastic magnetic layer side. The magnetic force can be improved as compared with.

According to a second aspect of the present invention, there is provided a method for magnetizing a magnetizing pulsar, wherein the N pole and the S pole of the magnetizing yoke are located at predetermined positions of the laminated body from both sides of the elastic magnetic layer side and the steel plate side. Since they oppose each other, the density of the magnetic flux penetrating from the elastic magnetic layer side to the steel sheet side can be increased. Therefore, in particular, the magnetizing force can be improved.

[Brief description of drawings]

FIG. 1 is a partial schematic view for explaining an embodiment of a magnetizing method for a magnetizing pulser according to the present invention.

FIG. 2A is a half cross-sectional view of an axial-type magnetized pulser that can be manufactured in a modification of the above-described embodiment, and FIG. 2B is a circumferential direction of the axial-type magnetized pulser. It is a top view showing a part of.

FIG. 3 is a partial schematic diagram for explaining a magnetizing method of a conventional magnetizing pulser.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Annular steel plate, 2 ... Elastic magnetic layer, 3 ... Annular laminated body, 4 ...
Magnetic flux, 5, 6 ... Magnetic pole part, 7 ... Magnetizing yoke, 8 ... Winding part,
10 ... Coil, 11 ... Power supply, 12, 13 ... Magnetic pole area.

Claims (2)

[Claims] 1. A method of magnetizing a magnetizing pulsar, wherein magnetic pole areas having opposite polarities are alternately formed on the elastic magnetic layer of a laminated body formed by laminating elastic magnetic layers on a steel sheet, the method comprising: A magnetic flux penetrating the laminated body from the elastic magnetic layer side to the steel sheet side at a position of 1 to form one magnetic pole area in the elastic magnetic layer; and a magnetic flux in a direction opposite to the magnetic flux. In addition to a predetermined position adjacent to the magnetic pole area of the stacked body, and a second step of forming a magnetic pole area of opposite polarity adjacent to the magnetic pole area are alternately repeated. Magnetization method. 2. The magnetizing method for a magnetizing pulsar according to claim 1, wherein N of the magnetizing yoke is sandwiched so as to sandwich a predetermined portion of the laminate from both sides of the elastic magnetic layer side and the steel plate side. A magnetizing method for a magnetizing pulsar, characterized in that the pole and the S pole are arranged to face each other to form the magnetic pole area.