JP4048402B2 - Permanent magnet type rotating electrical machine rotor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a permanent magnet type rotating electric machine in which a magnetic pole of a rotor is constituted by a permanent magnet, and more particularly to a structure for mounting a permanent magnet on an iron core of a rotor.
[0002]
[Prior art]
FIG. 11 is an external perspective view showing a conventional example of a rotor of a permanent magnet type rotating electric machine. A laminated iron core 2 is attached to the rotor shaft 1, and an axial through hole 3 having a square cross section is provided for each pole according to the number of poles (8 poles in the figure). As shown in FIG. 11, a plurality of cubic permanent magnet pieces (hereinafter simply referred to as magnet pieces) 4 are continuously inserted in the through holes 3 in the direction of the arrows and fixed with an adhesive or the like. The upper and lower surfaces of the magnet piece 4 are magnetized to N (or S) poles and S (or N) poles, respectively. FIG. 12 shows a different conventional example, in which a laminated core 2 is provided with a groove 5 having a convex cross section that is open on the outer peripheral surface side, and a magnet piece 4 is inserted into this groove 5. In this case, the left and right surfaces of the magnetic pole piece 4 are magnetized to N and S poles.
[0003]
[Problems to be solved by the invention]
FIG. 13 is a longitudinal sectional view of an essential part of the through hole portion in FIG. Since the rotor core 2 has a laminated structure of steel plates (silicon steel plate or pole steel plate) 6, a small step for each steel plate 6 inevitably occurs on the inner surface of the through hole 3. For this reason, when the magnet piece 4 is inserted into the through hole 3, the tip corner portion of the magnet piece 4 hits the step of the steel plate 6 as shown in the figure, and the magnet piece 4 cannot be inserted smoothly. In particular, when the magnet piece 4 inserted first hits a step, subsequent insertion becomes impossible at that time, and if it hits the back of the through hole 3, it cannot reach and must be pushed out from the opposite direction. In order to solve this problem, it is conceivable to chamfer or round the corners of the magnet piece 4, but this increases the cost of the magnet.
[0004]
FIG. 14 is a longitudinal sectional view of a main part showing a rotor having an air duct for cooling. In FIG. 14, as the laminated iron core 2, a plurality of iron core blocks 2a having a constant laminated thickness are attached to the rotor shaft 1 with a constant interval in the axial direction, and an air duct 7 is provided between the iron core blocks 2a and 2a. Is formed. Each iron core block 2 a is formed with an air duct 8 that communicates with the air duct 7 along the outer peripheral surface of the rotor shaft 1. Cooling air flows through the air ducts 7 and 8 as indicated by arrows.
[0005]
Now, when the permanent magnet piece 4 is inserted into a rotor with an air duct as shown in FIG. 14, there is an obstacle due to the air duct 7 in addition to the step between the steel plates 6 (FIG. 13) described above. That is, in the magnet piece 4, the corner of the tip falls into the air duct 7 in the process of insertion, and hits the next iron core block 2 a, so that the work of inserting the magnet piece 4 becomes more difficult. On the other hand, a permanent magnet is not required in the air duct portion in the laminated iron core 2, and a non-magnetic spacing piece 9 is usually inserted in this portion. In that case, since the spacing piece 9 is located at a position away from the iron core block 2a, that is, in the air duct 7, means for holding the spacing piece 9 at that position is required. The above problem also applies to the insertion of the magnet piece 4 into the rotor groove 5 (FIG. 12).
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it easy to insert a magnet piece into a rotor laminated core in a rotor of a permanent magnet type rotating electrical machine, and to eliminate the need for holding means for an interval piece in a rotor with an air duct. It is in.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention has an axial through hole or groove provided for each pole in a laminated iron core attached to a rotor, and has a step due to the laminated steel sheet constituting the laminated iron core inside. In a rotor of a permanent magnet type rotating electrical machine in which a plurality of permanent magnet pieces are continuously inserted into the through hole or groove, when the magnetic pole unit is inserted into the through hole or groove, the magnetic pole unit is A magnetic pole unit for each pole is formed by integrating the plurality of magnet pieces in a non-magnetic case that can be removed from the step when operated by hand. Insert into the through hole or groove of the laminated core.
Also, when the laminated iron core has an air duct, a plurality of permanent magnet pieces are integrated by interposing a non-magnetic spacing piece between them and accommodated together in a non-magnetic case. It is good to constitute.
[0007]
According to such means, since the magnet piece is integrated as a magnetic pole unit by the case and inserted into the laminated iron core, the number of times of hitting the step is smaller than when a plurality of magnet pieces are individually inserted, Even if the tip of the magnetic pole unit hits, it can be easily removed from the step by operating it at hand. On the other hand, when the gap piece is inserted between the magnet pieces, the gap piece can be held in the case together with the magnet piece, so that no separate gap piece holding means is required.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in the case of inserting a magnet piece into a through hole of a laminated core will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a rotor showing a basic embodiment of the present invention. In FIG. 1, a plurality of magnet pieces 4 of each pole are integrated as a magnetic pole unit 11 by being sequentially inserted and accommodated in a nonmagnetic material case 10 in the direction of the arrow, and a through hole of the rotor laminated core 2 is obtained. 3 is inserted. The case 10 is made of a non-magnetic metal such as stainless steel or resin, and is configured as a rectangular tube body with an open end of the magnet piece, and the magnet piece 4 is prevented from coming off by bending the ear piece 10a formed at the open end.
[0009]
The magnet piece 4 may be magnetized before insertion into the case 10, but if the entire case 10 is magnetized after insertion, there will be no magnetic repulsive force between the magnet pieces during insertion, so the insertion work is easy. become. The magnet piece 4 in the case 10 is fixed with an adhesive or the like as necessary so that it can withstand vibrations during operation of the rotating electrical machine. The magnetic pole unit 11 inserted into the through hole 3 is fixed by an adhesive or appropriate fastening means.
[0010]
According to the illustrated embodiment, the magnet piece 4 is integrated as a magnetic pole unit 11 by the case 10 and is inserted into the through hole 3 of the laminated iron core 2. As compared with the conventional configuration in which the plurality of magnet pieces 4 are individually inserted, the number of times of hitting the step is reduced. Even if the tip of the case 10 hits the step, the magnetic pole unit 11 protruding from the front of the through hole 3 can be easily removed from the step by hand. The insertion work is much easier than before.
[0011]
FIG. 2 shows an embodiment in which a spacing piece 9 made of a nonmagnetic material is inserted between the magnetic pole pieces 4 and 4 in a rotor having an air duct (see FIG. 14). And is inserted into the case 10 together with the through hole 3 (see FIG. 1) of the laminated iron core 2 as it is. Therefore, the spacing piece 9 is held by the case 10, and a separate spacing piece holding means is unnecessary.
[0012]
The magnet pieces 4 can be arranged in various patterns in the case 10. 3 to 5 show different arrangement examples of the magnet pieces 4. In FIG. 3, magnet pieces 4 are stacked not only in the axial direction of the rotor but also in the vertical direction (radial direction) in order to form a large magnetic pole. FIG. 4 shows magnet pieces 4 arranged not only in the axial direction of the rotor but also in the width direction (circumferential direction) in order to form a wide magnetic pole. FIG. 5 shows the magnet pieces 4 arranged in a staggered manner when the magnet pieces 4 are stacked not only in the axial direction but also in the vertical direction.
[0013]
Next, FIGS. 6 to 9 show various embodiments of the case 10. In FIG. 6, the case 10 is composed of a pair of upper and lower tray-like box bodies 10 ', and instead of covering the entire surface of the pole piece 4, it covers the upper and lower surfaces of the pole piece 4 and part of the side surfaces. Is. In FIG. 7, the case 10 is configured as a tray-like box and covers the lower surface and part of the side surface of the pole piece 4. In FIG. 8, the case 10 is configured as a rectangular tube with the front and rear ends open, and covers the upper and lower surfaces and the left and right side surfaces of the magnet piece 4. In FIG. 9, the case 10 is configured as a rectangular cylinder with the left and right ends open, and covers the upper and lower surfaces and the front and rear surfaces of the magnet piece 4. The above embodiment can be similarly applied to a rotor having the groove 5 (FIG. 12).
[0014]
【The invention's effect】
As described above, according to the present invention, a plurality of permanent magnet pieces are accommodated in a case made of a nonmagnetic material, and inserted into a through hole or a groove of a rotor laminated core as a magnetic pole unit in which they are integrated, The permanent magnet pieces do not individually bump into the steps, and the insertion work becomes extremely easy. In addition, in a rotor having an air duct, even when a spacing piece is inserted between the permanent magnet pieces, the spacing piece can be accommodated and held in the case together with the permanent magnet pieces. There is no need for a separate means for holding in the rotor, and the structure of the rotor is simplified.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a rotor showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a magnetic pole unit showing a different embodiment of the present invention.
FIG. 3 is a perspective view showing an example of arrangement of permanent magnet pieces according to the present invention.
FIG. 4 is a perspective view showing different arrangement examples of permanent magnet pieces in the present invention.
FIG. 5 is a perspective view showing still another example of arrangement of permanent magnet pieces according to the present invention.
FIG. 6 is a perspective view of a magnetic pole unit showing still another embodiment of the present invention.
FIG. 7 is a perspective view of a magnetic pole unit showing still another embodiment of the present invention.
FIG. 8 is a perspective view of a magnetic pole unit showing still another embodiment of the present invention.
FIG. 9 is a perspective view of a magnetic pole unit showing still another embodiment of the present invention.
FIG. 10 is an external perspective view showing a conventional example of a rotor of a permanent magnet type rotating electric machine.
11 is an enlarged view of a main part for explaining insertion of a permanent magnet piece into a through hole in the rotor of FIG.
FIG. 12 is a perspective view of a principal part showing a different conventional example of a rotor of a permanent magnet type rotating electric machine.
13 is a longitudinal sectional view of a through hole portion in FIG.
FIG. 14 is a longitudinal sectional view of an essential part showing a conventional example of a rotor having an air duct.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor shaft 2 Laminated iron core 3 Through hole 4 Permanent magnet piece 5 Groove 6 Laminated steel rod 9 Spacing piece 10 Case 11 Magnetic pole unit

Claims (2)

A laminated iron core attached to the rotor shaft is provided with axial through holes or grooves for each pole, and a plurality of permanent magnets are provided in the through holes or grooves having a step due to the laminated steel plates constituting the laminated iron core inside. In a rotor of a permanent magnet type rotating electrical machine in which pieces are continuously inserted, when the magnetic pole unit is inserted into the through hole or groove, the step is operated by hand when the magnetic pole unit hits the step. A plurality of magnet pieces are housed in a non-magnetic case that can be removed from each other to form a magnetic pole unit for each pole, and the magnetic pole unit is inserted into the through hole or groove of the laminated core. A rotor of a permanent magnet type rotating electrical machine characterized by 2. The rotor of the permanent magnet type rotating electric machine according to claim 1, wherein when the laminated iron core has an air duct therein, a plurality of permanent magnet pieces are inserted together with nonmagnetic spacing pieces interposed therebetween. A rotor of a permanent magnet type rotating electrical machine, wherein the magnetic pole unit is integrated with each other by being housed in a magnetic case.

Images