JP2020092484A - Magnetization device - Google Patents

Abstract

To provide a magnetization device capable of, with a simple configuration, magnetizing rotors having different outer diameters.SOLUTION: A magnetization device 10 includes a magnetization yoke 11 and a distance adjustment mechanism 12. The magnetization yoke 11 has a coil for applying a saturated magnetic field to a first single pole which is one pole included in a first rotor having a first outer diameter, and to a second single pole which is one pole included in a second rotor having a second outer diameter that differs from the first outer diameter. To magnetize the first single pole of a first rotor core, the distance adjustment mechanism 12 sets the distance between the first rotor core and the magnetization yoke to a first distance. To magnetize the second single pole of a second rotor core, the distance adjustment mechanism 12 sets the distance between the second rotor core and the magnetization yoke to a second distance.SELECTED DRAWING: Figure 1

Description

The present invention relates to a magnetizing device.

2. Description of the Related Art As a rotor used for an electric motor or a generator, there is a rotor core in which a plurality of magnetic bodies are mounted on a rotor core formed by stacking steel plates and the like. When manufacturing such a rotor, the rotor manufacturer uses a predetermined magnetizing device to magnetize the magnetic body assembled to the rotor to a desired polarity. For example, the method described in Patent Document 1 utilizes a magnetizing device having a plurality of main coils and a plurality of subcoils to simultaneously magnetize a plurality of poles assembled to a rotor core.

JP, 2016-063555, A

However, although the magnetizing device used in the method described in Patent Document 1 is applicable to a rotor having a preset number of poles and a preset outer diameter, It is difficult to accommodate different rotors. Further, this magnetizing device has a plurality of types of coils, and has a complicated structure. Therefore, when manufacturing many types of rotors, manufacturing costs may increase.

The magnetizing device according to the present invention has a magnetizing yoke and a distance adjusting mechanism. The magnetizing yoke is one pole included in the first rotor having the first outer diameter, which is one pole included in the first rotor, and one pole included in the second rotor having the second outer diameter different from the first outer diameter. It has a coil for giving a saturation magnetic field to each of the second monopoles. The distance adjusting mechanism sets the distance between the first rotor core and the magnetizing yoke to the first distance when magnetizing the first single pole of the first rotor core, and magnetizes the second single pole of the second rotor core. In this case, the distance between the second rotor core and the magnetizing yoke is set to the second distance.

With such a configuration, the magnetizing device adjusts the relative distance between the rotor and the magnetizing yoke to magnetize the rotor's single pole when magnetizing the magnetic bodies of the rotor having different outer diameters. Magnetize.

According to the present invention, it is possible to provide a magnetizing device capable of magnetizing rotors having different outer diameters with a simple configuration.

It is a schematic structure figure of a magnetizing device and a rotor concerning an embodiment. It is a figure which shows the 1st example which a magnetizing device magnetizes a rotor. It is a figure which shows the 2nd example which a magnetization device magnetizes a rotor. It is a figure which shows the example of the angle between coils of a magnetizing device.

Hereinafter, the present invention will be described through embodiments of the invention, but the invention according to the claims is not limited to the following embodiments. In addition, not all of the configurations described in the embodiments are essential as means for solving the problem.

The magnetizing device according to the embodiments described below is a device for magnetizing yokes having different outer diameters and pole numbers. The magnetizing device has a magnetizing yoke and a distance adjusting mechanism. The magnetizing yoke is one pole included in the first rotor having the first outer diameter, which is one pole included in the first rotor, and one pole included in the second rotor having the second outer diameter different from the first outer diameter. It has a coil for giving a saturation magnetic field to each of the second monopoles. The distance adjusting mechanism sets the distance between the first rotor core and the magnetizing yoke to the first distance when magnetizing the first single pole of the first rotor core, and magnetizes the second single pole of the second rotor core. In this case, the distance between the second rotor core and the magnetizing yoke is set to the second distance.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a magnetizing device and a rotor according to an embodiment. A magnetizing device 10 shown in the figure is a device for magnetizing a rotor 90 of a motor.

First, the rotor 90 will be described. The rotor 90 is installed in the case of the motor. The motor is, for example, a three-phase AC motor mounted on an automobile. The rotor 90 has a rotor core 91 and a magnet 92 as main components. The rotor core 91 is formed of flat steel plates laminated in the rotation axis direction. Further, the rotor core 91 has magnets 92 mounted at least near the outer periphery along the circumference. The magnet 92 is, for example, a magnet material containing iron, neodymium, boron or the like as a component. The magnet 92 becomes a permanent magnet when it is magnetized by being supplied with a magnetic flux having a saturation magnetic flux density or more from the outside.

Next, the magnetizing device 10 will be described. The magnetizing device 10 is a device for magnetizing the magnets 92 of a plurality of types of rotors 90 having different outer diameters. The magnetizing device 10 mainly has a magnetizing yoke 11 and a distance adjusting mechanism 12. For convenience of explanation, the magnetizing device 10 shown in the figure is shown with a part of the magnetizing yoke 11 cut.

The magnetizing yoke 11 generates a magnetic field and gives a magnetic flux to the rotor 90. The magnetizing yoke 11 has a magnetizing coil 110 as a main component. The magnetizing coil 110 has, for example, a wire rod made of a conductive material such as copper wound in an annular shape, and a current source (not shown) is connected to an end portion thereof. When the current is supplied from the current source, the magnetizing coil 110 generates a magnetic flux according to the magnitude of the supplied current. The magnetizing coil 110 is set so that the formed annular surface faces the side surface of the rotor 90. As a result, the magnetizing coil 110 can give a magnetic flux to the magnet of the rotor to be magnetized. The magnetizing coil 110 is set so as to give a saturation magnetic field to the magnet of one pole of the rotor to be magnetized.

The current source connected to the magnetizing coil 110 has a function of switching the polarity of the current supplied to the magnetizing coil 110. Thereby, the magnetizing device 10 can change the polarity to be magnetized depending on the magnetized target of the rotor 90.

The distance adjusting mechanism 12 supports the rotor 90 and adjusts the distance between the magnet 92 of the rotor 90 and the magnetizing yoke 11. The distance adjustment mechanism 12 has a support base 121, a linear guide 122, a slide plate 123, and an index table 124 as main components.

The support base 121 is a base of the magnetizing device 10. The support 121 supports the magnetizing yoke 11 and the linear guide 122.

The linear guide 122 is installed on the support base 121 and supports the slide plate 123 so as to be linearly movable. In the case of the example shown in the figure, the linear guide 122 can move the slide plate 123 in the directions Y1 and Y2. When the slide plate 123 moves in the direction Y1, the rotor 90 installed in the magnetizing device 10 approaches the magnetizing yoke 11. On the other hand, when the slide plate 123 moves in the direction Y2, the rotor 90 separates from the magnetizing yoke 11. Thus, the linear guide 122 can change the distance between the slide plate 123 and the magnetizing yoke 11.

Further, as shown in the figure, the magnetizing device 10 according to the present embodiment is installed such that the two linear guides 122 are separated by a predetermined distance and are parallel to the linear movement direction. With such an arrangement, the magnetizing device 10 can stably move the slide plate 123 in a straight line.

The slide plate 123 is supported by the linear guide 122 as described above, and is installed so as to be linearly movable in the directions Y1 and Y2. The slide plate 123 supports the index table 124 on its upper surface.

The index table 124 is rotatably installed in a turntable shape on the upper surface of the slide plate 123, and supports the rotor 90 on the upper surface. As the index table 124 rotates, the rotor 90 supported on the upper surface of the index table 124 also rotates around the rotation axis of the rotor. Further, by rotating the index table 124, the magnetizing device 10 can install the magnet 92 of the rotor 90 at an appropriate position with respect to the magnetizing coil 110 of the magnetizing yoke 11.

As described above, in the distance adjusting mechanism 12, the rotor 90 is installed on the index table 124. Then, the distance adjusting mechanism 12 changes the positional relationship between the rotor 90 and the magnetizing yoke 11 so that the magnet 92 of the installed rotor 90 has an appropriate distance or an appropriate position with respect to the magnetizing coil 110. You can do it. The distance adjusting mechanism 12 may have power such as a motor. Further, the distance adjusting mechanism 12 may have a sensor or the like for controlling the position of power such as a motor.

Next, in the magnetization performed by the magnetizing device 10, an example of magnetizing rotors of different sizes will be described. First, the case of magnetizing a rotor having a relatively large outer diameter will be described with reference to FIG. FIG. 2 is a diagram showing a first example in which the magnetizing device magnetizes the rotor. The magnetizing device 10 shown in the drawing schematically shows a state observed from the upper surface of the magnetizing device 10. As shown in the figure, in the magnetizing device 10, a rotor 90 a is installed in the distance adjusting mechanism 12. That is, the situation shown in the drawing shows that the magnetizing device 10 magnetizes the magnet 92a of the rotor 90a.

The illustrated rotor 90a has a diameter D1. Further, the rotor 90a is a rotor having eight poles and having eight magnets 92a(1) to 92a(8). When magnetizing the magnet 92a of the rotor 90a, the magnetizing yoke 11 and the rotor 90a are set to have a gap G1. In other words, the distance adjusting mechanism 12 is set at a position where the distance between the magnetizing yoke 11 and the center of the rotor 90a is H1. The interval G1 is 0.3 mm, for example.

The rotor 90a is installed so that the magnet 92a faces the magnetizing coil 110. That is, in the distance adjusting mechanism 12, the angle of the index table 124 is set so that the magnet 92a of the rotor 90a and the magnetizing coil 110 face each other.

In the above-described situation, when the magnet 92a(1) is completely magnetized, the magnetizing device 10 rotates the index table 124 by the gap angle Ap1 to magnetize the adjacent magnet 92a(2). At this time, the magnetizing yoke 11 reverses the polarity of the magnetizing coil 110, and applies to the magnet 92a(2) a magnetic flux having a reversed polarity from the magnetic flux applied to the adjacent magnet 92a(1). The magnetizing device 10 repeats such steps to magnetize the eight magnets 92a(1) to 92a(8) of the rotor 90a.

Next, a case where a rotor having a relatively small outer diameter is magnetized will be described with reference to FIG. FIG. 3 is a diagram showing a second example in which the magnetizing device magnetizes the rotor. As shown in the figure, in the magnetizing device 10, a rotor 90b is installed in the distance adjusting mechanism 12. That is, the situation shown in the drawing shows that the magnetizing device 10 magnetizes the magnet 92b of the rotor 90b.

The illustrated rotor 90b has a diameter D2. The two-dot chain line circle shown in the figure is the outer diameter of the rotor 90a. As shown in the figure, the diameter D2 of the rotor 90b is smaller than the diameter D1 of the rotor 90a. Further, the rotor 90b is a rotor having 10 poles and having 10 magnets 92b(1) to 92b(10). When magnetizing the magnet 92b of the rotor 90b, the magnetizing yoke 11 and the rotor 90a are set to have a gap G2. In other words, the distance adjusting mechanism 12 is set at a position where the distance between the magnetizing yoke 11 and the center of the rotor 90b is H2. In this embodiment, the gap G1 and the gap G2 are set to be the same. That is, the magnetizing device 10 can suitably adjust the distance between the magnet to be magnetized and the magnetizing coil 110 when magnetizing magnets of rotors having different outer diameters.

In order to set the gap between the magnetizing yoke 11 and the rotor 90b to G2, the distance adjusting mechanism 12 moves the distance H1-H2 in the direction Y1 from the state where the rotor 90a is installed. In this way, when the rotors having different outer diameters are installed, the magnetizing device 10 drives the distance adjusting mechanism 12 to adjust the distance between the magnetizing yoke 11 and the rotor.

The rotor 90b is installed so that the magnet 92b faces the magnetizing coil 110. That is, in the distance adjusting mechanism 12, the angle of the index table 124 is set so that the magnet 92b of the rotor 90b and the magnetizing coil 110 face each other.

When the magnet 92b(1) is magnetized in the above-described situation, the magnetizing device 10 rotates the index table 124 by the gap angle Ap2 to magnetize the adjacent magnet 92b(2). At this time, the magnetizing yoke 11 reverses the polarity of the magnetizing coil 110, and applies to the magnet 92b(2) a magnetic flux having a reversed polarity from the magnetic flux applied to the adjacent magnet 92b(1). The magnetizing device 10 repeats these steps to magnetize the eight magnets 92b(1) to 92b(10) of the rotor 90b.

In this way, the magnetizing device 10 adjusts the distance from the magnetizing coil 110 according to the outer diameter of the rotor. Further, the magnetizing device 10 indexes the rotor according to the number of poles of the magnet of the rotor and the angle between the poles.

Next, the inter-coil angle of the magnetizing coil 110 included in the magnetizing device 10 will be described with reference to FIG. FIG. 4 is a diagram showing an example of the inter-coil angle of the magnetizing device. The magnetizing coil 110 shown in the drawing is shown by a cross section parallel to a plane orthogonal to the rotation axis of the rotor 90 for convenience of description. Further, among the magnets 92 shown in the figure, a magnet 92t is a magnet to be magnetized, and a magnet 92n is a magnet adjacent to the magnet 92t.

The inter-pole angle Ap shown in the figure indicates the pitch (inter-pole) of the magnets 92 that the rotor 90 has in the circumferential direction, as an angle from the rotation center of the rotor 90. Further, the inter-coil angle Ac shown in the figure indicates an angle formed by two line segments that respectively connect the rotation center of the rotor 90 and the two inner circumferential surfaces of the magnetizing coil 110.

As shown in the figure, in the magnetizing device 10, the inter-coil angle Ac is set to be smaller than the inter-pole angle Ap of the rotor 90. By being set in this way, the magnetizing device 10 suppresses the magnetizing coil 110 from magnetizing the magnet 92n adjacent to the magnet 92t to be magnetized with an unintended polarity. Can be done.

The magnetizing device 10 has been described above. As described above, the magnetizing device 10 according to the embodiment has the magnetizing yoke for magnetizing one pole, and the magnetizing yoke is capable of reversing the polarity. Further, the magnetizing device 10 has the distance adjusting mechanism 12, so that the distance between the magnetizing yoke and the magnet can be suitably adjusted, and indexing can be performed according to the polarity of the rotor. Further, the magnetizing device 10 is configured such that the inter-coil angle is smaller than the inter-pole angle. As a result, the magnetizing device 10 does not reversely magnetize the adjacent magnets.

As described above, according to the embodiment, it is possible to cope with magnetization of a plurality of yokes having different outer diameters and a plurality of different poles. Further, according to the embodiment, it is possible to provide a magnetizing device with a simple structure without having a plurality of different magnetizing coils. Further, according to the embodiment, the energy required for the magnetization is smaller than that in the case where the magnetization of a plurality of poles is performed, so that the power supply equipment and the like can be downsized.

As described above, according to the embodiment, it is possible to provide a magnetizing device capable of magnetizing rotors having different outer diameters with a simple configuration.

The present invention is not limited to the above-mentioned embodiments, but can be modified as appropriate without departing from the spirit of the present invention.

10 magnetizing device 11 magnetizing yoke 12 distance adjusting mechanism 90 rotor 91 rotor core 92 magnet 110 magnetizing coil 121 support base 122 linear guide 123 slide plate 124 index table

Claims (1)

A first single pole, which is one pole included in the first rotor having a first outer diameter, and a second single pole, which is one pole included in a second rotor having a second outer diameter different from the first outer diameter. A magnetizing yoke having a coil for applying a saturation magnetic field to each of
When magnetizing the first monopole of the first rotor, the distance between the first rotor and the magnetizing yoke is set to the first distance, and the second monopole of the second rotor is magnetized. And a distance adjusting mechanism for setting a distance between the second rotor and the magnetizing yoke to a second distance.

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