JPH118122A - Multipolar magnetizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To closely adhere teeth uniformly to a body to be magnetized and to prevent a large shock from being inflincted on the body when the teeth strike on the body, by a method wherein back yokes and the teeth are independently formed, and pressing means for pressing the teeth so as to closely adhere to teeth to the body to be magnetized are provided. SOLUTION: Magnetizing jigs 1 respectively consist of a back yoke 2, teeth 3 and winding wires 4. The teeth 3 are slidingly mounted to the yokes 2. A body 5 to be magnetized is held between the jigs 1, and the teeth 3 are closely adhered to the body 5. The upper and lower back yokes 2 are guided by guide bar 6 to slide freely. There are one pair of upper press plates 7 and one pair of lower press plates 7, and the plates 7 are slidingly supported by the bars 6. Plate springs 8 are mounted to the plates 7 in alignment with the positions of the teeth 3, and the springs 8 are made contact with the teeth 3. Distortion sensors 9 are respectively mounted to each plate spring 8. The one pair of the upper press plates 7 and the one pair of the lower press plates 7 press the teeth 3 via the springs 8 so as to closely adhere the teeth 3 to the body 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole magnetizing apparatus for simultaneously magnetizing a plurality of magnetic poles on a magnetic body.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional multipolar magnetizing device. In the figure, reference numeral 1 denotes a magnetizing jig, which is paired up and down. The magnetizing jig 1 includes a back yoke 2, teeth 3 and windings 4. The back yoke 2 and the teeth 3 are made of a magnetic material and are integrally formed. The teeth 3 are convex portions protruding from the back yoke 2 and are attached by the number of magnetic poles to be magnetized. The windings 4 are respectively wound around the teeth 3. Reference numeral 5 denotes a magnetized body. The magnetized body 5 is sandwiched and pressed by a pair of upper and lower magnetizing jigs 1 by a pressing device (not shown). When the winding 4 is energized, the magnetic flux 10 from one tooth 3 passes through the adherend 5 to the other tooth 3.
Is formed, and the magnetized body 5 is magnetized.

[0003]

However, the prior art has the following problems. Since the height of the teeth 3 becomes non-uniform due to processing errors of the teeth 3 or wear and damage during use, when the magnetizing jig 1 is pressed against the magnetized body 5, the teeth 3 and the teeth 3 are displaced. There is a problem that the gap varies for each magnetic pole and uniform magnetization cannot be performed. In addition, if the height of the teeth 3 is not uniform, the pressing force is concentrated on a small number of the teeth 3 that come into contact with the magnetized body 5 among the plurality of teeth 3, so that the magnetized body 5 may be broken. there were. Further, in the conventional multipolar magnetizing device, there is a problem that the magnet 3 is broken by an impact when the teeth 3 hit the magnet 5. These problems are caused by the adherend 5
However, when the material is a brittle material such as a samarium-cobalt magnet, the problem is particularly severe. Therefore, an object of the present invention is to provide a multi-pole magnetizing device in which the teeth 3 and the magnetized body 5 are evenly adhered to each other and do not give a large impact when the teeth 3 hit the magnetized body 5.

[0004]

In order to solve the above problems, the present invention separates the back yoke and the teeth so that the teeth can be slid independently of each other in the direction toward the magnetic body. There is provided a pressing means which is supported by the back yoke and presses the teeth so as to be in close contact with the adherend. Further, an elastic body is provided between the teeth and the pressing means. Further, a strain sensor is attached to the elastic body.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a multipolar magnetizing device showing a first embodiment of the present invention. In the figure, reference numeral 1 denotes a magnetizing jig, which is paired up and down. The magnetizing jig 1 includes a back yoke 2, teeth 3 and windings 4. Teeth 3
Are mounted on the back yoke 2 slidably,
The winding 4 is wound around the teeth 3. Reference numeral 5 denotes a magnetized body, which is sandwiched between the magnetizing jigs 1 and to which the teeth 3 are in close contact.
Reference numeral 6 denotes a guide rod, which penetrates the upper and lower back yokes 2. The upper and lower back yokes 2 are guided by guide rods 6 and slide freely. Reference numeral 7 denotes a pair of upper and lower pressing plates, which are slidably supported by guide rods 6. A leaf spring 8 is attached to the holding plate 7 in accordance with the position of the teeth 3, and the leaf spring 8 is in contact with the teeth 3. Reference numeral 9 denotes a strain sensor, which is attached to the leaf spring 8. The pair of upper and lower pressing plates 7 are sandwiched between pressing devices (not shown), and press the teeth 3 via the plate springs 8 so as to be in close contact with the adherend 5. The procedure of magnetizing by this multipolar magnetizing device will be described. (1) The magnetic body 5 is sandwiched between the upper and lower magnetizing jigs 1, and the teeth 2 are brought into contact with the magnetic body 5. (2) Insert the guide rod 6 into the back yoke 2 so that the upper and lower magnetizing jigs 1 do not shift. (3) The magnetizing jig 1 is sandwiched between the holding plates 7 from above and below. In this way, a multipolar magnetizing device as shown in FIG. 1 is assembled. (4) The pressing plate 7 is pressed from above and below by the pressing device. At this time, the impact of the teeth 3 hitting the adhered magnetic body 5 is absorbed by the leaf spring 8, so that the impact is not applied to the adhered magnetic body 5. (5) While monitoring the measurement position of the strain sensor 9, the pressing plate 7 is pressed until the pressing force applied by the teeth 3 to the adherend 5 reaches a predetermined value. (6) When a pulse current is applied to the winding, a magnetic flux 10 is generated,
The magnetic body 5 is magnetized. (7) The pressing device is opened, and the magnetic body 5 is taken out. The configuration of the pressing device is not limited as long as it has a function of pressing the pressing plate 7 from above and below. For example, the guide rod 6 may be screwed and tightened with a nut, or may be a pneumatic cylinder. The leaf spring 8
May be any elastic body as long as a required spring constant can be obtained. In this manner, the teeth 3 are independently slid and brought into close contact with the magnetized body 5.
The teeth 3 and the adherend 5
Since the variation in the gap does not occur, the variation in the magnetic flux density for each magnetic pole is reduced. Table 1 shows the difference between the variation of the magnetic flux density by the conventional multipolar magnetizing device and the variation of the magnetic flux density by the multipolar magnetizing device of the present invention. Compared to the past,
It can be seen that the variation is about 1/6.

[0006]

[Table 1]

Further, since no impact or excessive pressure is applied to the magnetized body 5, as shown in Table 2, the breakage rate of the magnetized body 5 which was 60% in the past was reduced to 0.

[0008]

[Table 2]

[0009]

As described above, according to the present invention, the following effects can be obtained. (1) Even if there is a variation in the dimensions of the teeth, the teeth are evenly adhered to the magnetized body, so that uniform magnetization can be achieved. (2) Since the impact when the teeth hit the magnetic body is absorbed by the elastic body, the damage rate of the magnetic body is small. (3) Since the pressing force of the teeth against the magnetic body is monitored by the strain sensor, the damage rate of the magnetic body is small.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a multipolar magnetizing device of the present invention.

FIG. 2 is a side sectional view showing a conventional multipolar magnetizing device.

[Explanation of symbols]

 1: Magnetizing jig 2: Back yoke 3: Teeth 4: Winding 5: Magnetic body 6: Guide rod 7: Holding plate 8: Leaf spring 9: Strain sensor 10: Magnetic flux

Claims (3)

[Claims] 1. A magnetizing jig having a plurality of teeth protrudingly arranged on a back yoke and winding the teeth on the teeth.
A pair of magnetizing jigs arranged such that the teeth of one of the magnetizing jigs face the teeth of the other magnetizing jig, and a pressing device for pressing the pair of magnetizing jigs And pressing the teeth with the pressing device with the pair of magnetizing jigs sandwiching the magnetized body, bringing the teeth into close contact with the magnetized body, energizing the windings, and magnetizing the magnetized body. In the multipolar magnetizing device, the teeth are formed as independent separate members, slidably supported in the pressing direction by the back yoke, and the non-magnetized side of the teeth is pressed by the pressing device. Multi-pole magnetizer. 2. The multi-pole magnetizing device according to claim 1, wherein an elastic body is disposed between an end of the tooth on the non-magnetizing side and the pressing device. 3. The multipolar magnetizing device according to claim 2, wherein a strain sensor is attached to said elastic body.