JPS6024660B2 - magnet rotor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a magnet rotor for a synchronous motor.

To construct the rotor of a synchronous motor, permanent magnets have traditionally been incorporated into a squirrel cage rotor.

This example will be explained with reference to FIGS. 1 and 2. 1 is a rotor iron plate with slots 2 around the periphery, a dowel hole 3 in the center, and a hole 4 for installing a permanent magnet, and the required number of plates are stacked.

Reference numeral 5 designates a Hikyu magnet installed in a hole 4 with its magnetic pole faces N and S directed in the direction of rotation, and reference plate 6 is a contact plate placed at both ends of the stacked rotor iron plates 1, with a shaft hole 7 in the center.

Reference numeral 8 denotes a rotating shaft that passes through the stacked rotor iron plates 1 and contact plate 6.

Reference numeral 9 denotes a secondary conductor and an end ring which were formed in the slot 2 and on the end face of the rotor iron plate 1 by die-casting after being constructed in this way.

With this configuration, the magnetic flux of the permanent magnet leaks as shown by chain lines a and b. Therefore, in order to increase the magnetic resistance between the magnetic pole faces N and S and prevent leakage of magnetic flux, it has been considered to divide the rotor iron plate 1 and provide slits 10. At this time, when the synchronous motor is operated, a large centrifugal force is applied to the rotor iron plate. Therefore, in order to support the rotor iron plate from this centrifugal force, a support plate 11 and a support pin 12 are provided. This will be explained in detail. The non-magnetic support plate 11 is sandwiched between the laminated rotor iron plates 1, and as shown in the third part, slots 13, holes 14 for passing the permanent magnets 5, and shaft holes 15 are formed in the same position as the rotor iron plates 1. establish. Reference numeral 12 denotes a support pin that fixes the rotor iron plate 1, the contact plate 6, and the support plate 11 together, and includes a pin hole 16 made in the rotor iron plate 1, a pin hole 17 made in the contact plate 6, and a pin hole made in the support plate 11. pierce through the pin hole 18.

With this configuration, the centrifugal force applied to the rotor iron plate 1 can be received by the contact plate 6 and the support plate 11, making it possible to create a magnetic rotor that rotates at high speed.

However, by sandwiching the non-magnetic support plate 11 between the rotor iron plates 1, it becomes impossible to effectively utilize all the magnetic flux of the permanent magnet 5, as shown in FIG. That is, the part of the permanent magnet 5 that penetrates the support plate 11 is blocked by the support plate 11 and cannot generate magnetic flux. Therefore, the performance of the incorporated permanent magnets 5 could not be maximized, resulting in poor characteristics of the synchronous motor. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure of a magnet rotor that can effectively utilize all the magnetic flux of the incorporated permanent magnets.

That is, the present invention provides a layer of a substance with high magnetic permeability on the magnetic pole face of a permanent magnet incorporated in a rotor.

A specific embodiment of the present invention is shown in FIG. 5 below.

Reference numeral 19 denotes a layer of a material with high magnetic permeability coated on both magnetic pole faces N and S of the permanent magnet 5, and in the embodiment, it is plated with a good magnetic material such as hard chromium.

The other configurations except for the permanent magnet 5 are the same as those of the conventional one, so the explanation will be omitted. In this way, layer 1 of an object with high magnetic permeability
If the permanent magnet 5 with a coping 9 is incorporated into the rotor, what will be the magnetic flux of the permanent magnet 5? passes through the layer 19 and flows into the rotor iron plate 1.

At this time, as shown in FIG. 6, the magnetic flux of the permanent magnet 5 placed in the hole 14 of the non-magnetic support plate 11 must pass through the layer 19 of the material with high conductivity and bypass the support plate 11. Then, it flows into the rotor iron plates 1 on both sides of this support plate 11. Therefore, by providing the layer 19 of a material with high magnetic permeability, all of the magnetic flux ◇ possessed by the permanent magnet 5 can be extracted and utilized. Furthermore, the permanent magnet 5 generally made of ferrite material or the like has difficulty achieving external dimensional accuracy.

Therefore, the inner surface of the hole 4 of the rotor iron plate 1 and the support plate 11
A gap is formed between the inner surface of the hole 14 and the magnetic pole surface of the permanent magnet 5. However, in the present invention, since the layer 19 of a material with high magnetic permeability is provided in the gap, there is an effect of preventing the permanent magnet 5 from being damaged by impacts caused by rotational fluctuations, etc. In the above embodiment, hard chromium was used as the good magnetic material, but other good magnetic materials may be used.

In addition, we have shown a case in which a layer of a material with high magnetic permeability is provided on the entire magnetic pole surface of a permanent magnet, but this is applied only to the magnetic pole surface of the permanent magnet placed in the hole drilled in the non-magnetic support plate. Even if it is provided, sufficient effects can be achieved. Conversely, the same effect can be obtained by providing a layer of a material with high magnetic permeability on the inner surface of the hole in the support plate facing the magnetic pole surface of the permanent magnet. Furthermore, the layer of material with high conductivity can be constructed by gluing a thin plate of good magnetic material to the pole face, or by gluing a thin plate of good magnetic material to the pole face of the permanent magnet and the inner surface of the hole in the support plate. It is also good to sandwich it. As is clear from the above description, the present invention provides a conductive material between the magnetic pole surface of the permanent magnet in the portion that penetrates the non-magnetic support plate and the inner surface of the hole drilled in the support plate through which the permanent magnet passes. This is due to the fact that a layer of material with a high ratio is provided.

Therefore, according to the present invention, all the magnetic flux possessed by the permanent magnets flows into the rotor iron plate, so that the performance of the incorporated permanent magnets can be maximized and a magnetic rotor with good characteristics can be obtained. In addition, there is an effect of preventing the permanent magnet from being damaged due to the magnetic pole surface of the permanent magnet coming apart on the inner surface of the hole formed in the support plate for passing the permanent magnet when the rotation changes.

[Brief explanation of drawings]

Fig. 1 is a sectional view for explaining a conventional magnet rotor, Fig. 2 is a sectional view taken from Fig. 1 A-A, and Fig. 3 is a sectional view taken from Fig. 1 B-
FIG. 4 is a cross-sectional view for explaining the flow of magnetic flux, FIG. 5 is a diagram showing a permanent magnet used in an embodiment of the present invention, and FIG. 6 is a diagram showing the flow of magnetic flux in the embodiment. FIG. 2 is a sectional view for explaining. 1 is a rotor iron plate, 3 is a shaft hole, 4 and 14 are holes for attaching magnets, 5 is a magnet, 10 is a slit, 1 1 is a non-magnetic support plate, 12 is a support pin, 16 and 18 are support pins hole for 1
9 is a layer of material with high magnetic permeability, and N and S are magnetic pole surfaces. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5

Claims (1)

[Claims] 1. A magnetic iron plate having a plurality of holes for magnet devices, holes for support pins, and a shaft hole in the center, and a slit that communicates at least the hole for the magnet device with the shaft hole, and this magnetic iron plate. a support plate made of a non-magnetic material formed of a single plate and having a hole for a magnet device and a hole for a support pin at the same positions as the hole for the magnet device and the hole for the support pin, respectively; In a magnet rotor comprising magnets mounted in both holes for mounting and support pins mounted in both holes for the support pins, and in which the support plates are arranged in the middle of laminating the magnetic iron plates, the magnetic pole face of the magnet A magnet rotor, characterized in that a layer of a substance having high magnetic permeability is provided between the inner surface of the hole provided in the support plate.