JPH0414486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multipolar magnetic pole in which a large number of magnetic poles of different polarities are alternately arranged, and a method for producing the same.

Prior Art In a conventional method for producing multipolar magnetic poles in which a large number of magnetic poles of different polarities are alternately arranged, as shown in FIG.
The magnetizing device 2 is placed close to the magnet. This magnetizing device 2 has a magnetizing yoke 3 and a magnetizing coil 4 wound around the magnetizing yoke. Then, by applying current to the magnetizing coil 4 and passing a magnetic flux through the magnetizing yoke 3 and the magnetic body 1, magnetization is performed with the illustrated polarity, and this magnetization operation is performed in the direction of the magnetic pole arrangement on the magnetic pole forming surface 1a. Multipolar magnetic poles are produced by sequentially performing the steps.

However, in such conventional production methods, the magnetization operation has to be performed in several steps as described above, which makes the magnetization operation troublesome.
In particular, there was a problem in that as the number of poles increased, the number of magnetizing operations had to be increased. Also,
The multipolar magnetic poles produced by the above method have poor magnetization accuracy, and furthermore, magnetization is performed only at a shallow depth from the magnetic pole forming surface 1a.
The drawback was that strong magnetization could not be obtained.

OBJECT OF THE INVENTION An object of the present invention is to provide a multipolar magnetic pole that can obtain highly accurate and strong magnetization with a simple magnetizing operation using a simple magnetizing device, and a method for producing the same. .

Structure of the Invention In order to achieve the above object, the multi-polar magnetic pole of the present invention includes a soft magnetic material in which a large number of grooves and teeth are arranged alternately on a magnetic pole forming surface, and a soft magnetic material accommodated in each groove of the soft magnetic material. a permanent magnet material, each permanent magnet material is magnetized to a predetermined polarity in the depth direction of the groove, and the tip of each tooth of the soft magnetic material is different from the end of the adjacent permanent magnet material. It is characterized by having a large number of magnetic poles that are magnetized with polarity and are made up of the permanent magnet material and the teeth of the soft magnetic material.

Furthermore, the method for producing multipolar magnetic poles according to the present invention includes:
A soft magnetic material in which a large number of grooves and teeth are alternately arranged on the magnetic pole forming surface and a permanent magnet material is housed in each of the grooves is used, and the soft magnetic material is attached between the magnetic pole forming surface side and the back surface thereof. Each of the permanent magnet materials is magnetized through a magnetic flux, and the tip of each tooth portion of the soft magnetic material is magnetized with a polarity different from the end of the adjacent permanent magnet material by the magnetic flux of each permanent magnet material. It is characterized by forming a magnetic pole.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

In the method for producing a multipolar magnetic pole according to the present invention, first, as shown in FIG. A large number of grooves 5b are punched out at predetermined intervals and depths on the forming surface 5a, and the remaining punched parts are used to form teeth 5d.
form. Next, as shown in FIG. 3, a resin magnet material 6 such as a so-called plastic magnet is molded into each groove portion 5b as a permanent magnet material.

Thereafter, as shown in FIG. 4, a large number of magnetic poles are magnetized on the resin magnet material 6 using the magnetizing device 7. In the magnetizing device 7 used in this embodiment, the opposing end surfaces of the pair of legs 8b have lengths and widths corresponding to the length and width of the soft magnetic body 5, and the thickness of the soft magnetic body 5 (or height) facing each other across a gap 8a, and a magnetizing coil 9 wound around the magnetizing yoke.
It has Using such a magnetizing device 7, the soft magnetic body 5 in which the resin magnet material 6 described above is molded is placed in the gap 8a of the magnetizing yoke 8, and a current I is caused to flow through the magnetizing coil 9 in the direction of the arrow. In the soft magnetic body 5, a magnetic flux φ flows in the direction of the arrow between the magnetic pole forming surface 5a side and the back surface 5c of the magnetic pole forming surface. As a result, the resin magnet material 6 is magnetized in the depth direction of the groove portion 5b, and is magnetized as shown by the polarities S and N in FIG. Further, in this case, the tip end of each tooth portion 5d also has S polarity.

FIG. 5 shows a multipolar magnetic pole taken out from the magnetizing device 7. As mentioned above, this multipolar magnetic pole has resin magnets inserted into a large number of grooves 5b formed in the magnetic pole forming surface 5a of the soft magnetic material 5. The resin magnet material 6 is molded, and the surface side of the resin magnet material 6 is magnetized to S polarity. On the other hand, each tooth portion 5d of the soft magnetic body 5
In the state shown in FIG. 4, the tip becomes S polarity once, but when it is taken out from the magnetizing device 7, this magnetism disappears, and the tip of each tooth 5d receives magnetic flux from the adjacent resin magnet material 6. It is magnetized to N polarity.
Therefore, each tooth portion 5d of the soft magnetic material 5 and each resin magnet material 6 form a large number of adjacent magnetic poles with different polarities.

As described above, according to this embodiment, a large number of magnetic poles can be magnetized at once by a simple magnetizing operation using a simple magnetizing device 7 as shown in FIG. Moreover, as is clear from FIG. 5, this magnetization is extremely accurate because the ends of the resin magnet material 6 and the tooth portion 5d are arranged adjacently with different polarities, and the resin magnet material in the groove portion 5b is The magnetization of the material 6 causes the soft magnetic body 5 to be magnetized to a deep position, so that strong magnetization can be obtained.

Furthermore, in this embodiment, since resin magnet material is molded as the permanent magnet material to be accommodated in the groove of the soft magnetic material, a large number of teeth of the soft magnetic material and permanent magnet material are alternately arranged on the magnetic pole forming surface of the soft magnetic material. The forming operation can be performed extremely easily, and the production efficiency of multipolar magnetic poles can be improved.

In the above-described embodiments, the grooves formed in the soft magnetic material were formed by punching with a press, but the grooves may be formed by any other machining process.

Further, the soft magnetic material used in the present invention may be formed of an appropriate resin soft magnetic material.

Furthermore, in the above embodiment, a magnetizing device with a length corresponding to the length of the soft magnetic material was used, but when a considerably long multi-polar magnetic pole is to be targeted, it is necessary to use a magnetizing device with an appropriate length. A magnetic device may be used to collectively magnetize a large number of magnetic poles for each predetermined arrangement section.

Furthermore, in the embodiments described above, linearly shaped multipolar magnetic poles are shown, but it is clear that the present invention is not limited to this and can be applied to multipolar magnetic poles of various shapes such as circular. be.

Effects of the Invention As described above, the method for producing a multipolar magnetic pole of the present invention includes forming a large number of grooves and teeth in an alternating array on the magnetic pole forming surface of a soft magnetic material, and accommodating a permanent magnet material in each of the grooves. , magnetizing the permanent magnet material by passing a magnetizing magnetic flux between the magnetic pole forming surface side of the soft magnetic material and its back surface, and magnetizing the tip of each tooth portion of the soft magnetic material by the magnetic flux of the permanent magnet material. Since the end of the permanent magnet material is magnetized to a different polarity to form a large number of magnetic poles, it is possible to magnetize a large number of magnetic poles at once or in a predetermined manner by a simple magnetizing operation using a relatively simple magnetizing device. This can be done for each array category at once. Thereby, the required multipolar magnetic poles can be produced with high efficiency. Furthermore, the multipolar magnetic pole of the present invention has high magnetization accuracy because the ends of the permanent magnet material and the soft magnetic teeth are arranged adjacently with different polarities. Furthermore, since the soft magnetic material is magnetized to a deep position by the magnetization of the permanent magnet material housed in the groove of the soft magnetic material, there is an advantage that the magnetization is strong. Therefore, the present invention is extremely effective when applied to magnetic flux generation sources for magnetic poles for magnetic sensors, rotors for step motors, various rotating machines, or electrical equipment that performs linear motion, and their production.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional method for producing multipolar magnetic poles, FIGS. 2 to 4 are explanatory diagrams showing embodiments of a method for producing multipolar magnetic poles according to the present invention, and FIG. FIG. 3 is an explanatory diagram showing the magnetized state of such multi-polar magnetic poles. 5... Soft magnetic material, 5a... Magnetic pole forming surface, 5b... Groove, 5c... Back side of magnetic pole forming surface, 5d... Teeth, 6...
Resin magnet material as a permanent magnet material.

Claims (1)

[Scope of Claims] 1. A soft magnetic material in which a large number of grooves and teeth are alternately arranged and formed on a magnetic pole forming surface, and a permanent magnet material accommodated in each groove of the soft magnetic material, and each permanent magnet The material is magnetized with a predetermined polarity in the depth direction of the groove, and the tip of each tooth of the soft magnetic material is magnetized with a different polarity from the end of the adjacent permanent magnet material, so that the material is magnetized with a predetermined polarity in the depth direction of the groove. A multi-polar magnetic pole characterized by having a large number of magnetic poles made up of teeth of the soft magnetic material. 2. The permanent magnet material is made of a resin magnet material molded in each of the grooves.
Multipolar magnetic poles as described in section. 3. Using a soft magnetic material in which a large number of grooves and teeth are alternately arranged on the magnetic pole forming surface and a permanent magnet material is accommodated in each of the grooves, a magnetic material is provided between the magnetic pole forming surface side of the soft magnetic material and its back surface. Magnetizing each of the permanent magnet materials through a magnetizing magnetic flux, and magnetizing the tip of each tooth of the soft magnetic material to a polarity different from that of the end of the adjacent permanent magnet material by the magnetic flux of each permanent magnet material. A method for manufacturing a multipolar magnetic pole, characterized by forming a large number of magnetic poles. 4. Claim 3, wherein the permanent magnet material is a resin magnet material molded into each of the grooves.
Method for producing multi-polar magnetic poles as described in Section 1.