JP2005012870A - Rotor of permanent magnet type rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance productivity of rotor by facilitating the position of magnet pieces obtained by dividing a permanent magnet when they are stuck to the rotor core of a permanent magnet type rotary electric machine employing a permanent magnet in the field pole. <P>SOLUTION: A permanent magnet having specified dimensions is divided into a number of pieces corresponding to the number of poles and the same number of interval pieces of nonmagnetic body having specified dimensions are provided. The divided magnet pieces and the interval pieces are arranged alternately on the outer circumferential surface of the rotor core over the entire circumference while abutting the end parts tightly each other and then stuck to the outer circumference of the rotor core. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a permanent magnet type rotating electrical machine using a permanent magnet as a field pole of a rotor.
[0002]
[Prior art]
The rotor of a permanent magnet type rotating electrical machine that uses a permanent magnet as the rotor field pole has a surface magnet type rotor with a permanent magnet attached to the surface of the iron core. These can be broadly classified into those that are bonded together with an adhesive and those that are bonded to each other with a permanent magnet piece divided into a bow or plate shape on the surface of the rotor core.
[0003]
When a cylindrical magnet is used, the magnet is easily attached, but the magnet itself is much more expensive than the split magnet.
[0004]
On the other hand, when a split magnet is used, the magnet itself is easy to manufacture, so the price is low. However, positioning is difficult when pasting to the outer peripheral surface of a magnetic material rotor core, as shown in FIG. 4. Position using a special jig, or form a special groove (tab tail groove) for fitting the magnet into the rotor core, as shown in FIG. 4, and fit the split magnet into this groove. It was common to perform installation.
[0005]
In the conventional example shown in FIG. 3, in order to attach the magnet pieces to the rotor core, a magnet space portion that houses the magnet pieces 14 composed of the annular upper frame 26, the annular lower frame 27, the columnar frame 28, and the separator 29 is provided. A jig 20 having 21 is used. By attaching the magnet piece 14 to the magnet space portion 21 of this jig, the position of the magnet piece is determined, and then the rotor core 11 coated with adhesive is inserted into the rotor space portion at the center of the jig 20. The magnet pieces are pressed from the outside so that they are brought into close contact with the outer peripheral surface of the rotor core, and after the adhesive is cured, the jig is removed to make the intervals between the magnet pieces attached to the rotor core uniform. (See Patent Document 1).
[0006]
FIG. 4 shows a conventional example of a magnet piece mounting structure in which a magnet piece mounting groove is provided in a rotor core and the magnet piece is fitted into the groove (see Patent Document 2).
[0007]
A required number of magnet piece mounting grooves 35 having a tab-tail cross-sectional shape in the outer peripheral direction are provided in the axial direction of the rotor core on the outer peripheral portion of the rotor core 30, and each groove 35 has a trapezoidal divided permanent shape. The magnet piece 31 is fixed to the rotor core 30 by fitting the magnet piece 31. The magnet piece is precisely positioned at the position of the groove.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-264817 (page 2-3, FIG. 1-7)
[Patent Document 2]
JP 2000-152535 A (page 2-3, FIG. 1 to FIG. 2)
[0009]
[Problems to be solved by the invention]
As described above, in the conventional surface magnet type rotor, there is an inconvenience that the use of a cylindrical permanent magnet is expensive, and in order to eliminate this inconvenience, when a split permanent magnet is used, a split permanent magnet is used. When a magnet is placed on a rotor core, a special assembly jig is required for positioning, or a special holding groove is required in the rotor core. Expenses and man-hours were required, and productivity could not be improved.
[0010]
An object of the present invention is to provide a rotor of a permanent magnet type rotating electrical machine that can eliminate the disadvantages of the conventional surface magnet type rotor and increase the productivity.
[0011]
[Means for Solving the Problems]
In order to achieve such an object, according to the present invention, in a rotor of a permanent magnet type rotating electrical machine, a divided magnet piece of a permanent magnet having a predetermined size divided into a number corresponding to the number of poles and the same number of the divided magnet pieces. A non-magnetic spacing piece of a predetermined size is provided, and the divided magnet pieces and the spacing pieces are alternately arranged on the outer peripheral surface of the rotor core all around the circumference and arranged so that the end portions thereof are in close contact with each other and rotate. It is characterized by being affixed to the outer periphery of the core.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to examples shown in the drawings.
[0013]
FIG. 1 is a perspective view showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a rotor core made of a magnetic material, 2 denotes a divided magnet piece having a circular section formed by dividing a permanent magnet, and 3 denotes an interval piece made of a nonmagnetic material. The spacing piece 3 is also formed in an arc shape in cross section.
[0014]
Since the curvature of the inner circumference of the arc of the segment magnet piece 2 and the spacing piece 3 is matched to the curvature of the outer circumference of the rotor core 1, when they are arranged on the outer circumference of the rotor core, they are closely joined to the rotor core. Will come to be.
[0015]
Further, 5 is a reinforcing ring made of a non-magnetic material for suppressing the outer periphery of the divided magnet piece 2 and the spacing piece 3, which is provided for preventing scattering of the rotating divided magnet pieces. If the adhesive strength of the magnet pieces and the spacing pieces to the rotor core is sufficiently large, this can be omitted.
[0016]
Since the embodiment shown in FIG. 1 is an example of a four-pole rotor, four divided magnet pieces 2 and four spacing pieces 3 are provided. The four divided magnet pieces 2 have their end portions in close contact with each other so that no gaps are formed between the outer peripheral surfaces of the rotor core 1 with the gap pieces 3 interposed therebetween. They are arranged and attached to the outer peripheral surface of the rotor core with an adhesive.
[0017]
What is important at this time is that the size of the rotor core 1 and The shapes and dimensions of the divided magnet pieces and the spacing pieces are formed in accordance with the number of magnetic poles.
[0018]
By forming the split magnet pieces 2 and the spacing pieces 3 in this way, the magnet pieces can be attached to the rotor core without using a special jig as shown in FIG.
[0019]
Since FIG. 2 shows the manufacturing process of the rotor of the permanent magnet type rotating electrical machine, this will be described.
[0020]
First, as shown in FIG. 2A, an arbitrary point on the outer peripheral surface of the rotor core 1 is selected as a base point, and one spacing piece 3a having an adhesive applied to the inner peripheral surface of the arc is placed here. And paste.
[0021]
Next, as shown in FIG. 2 (b), one segmented magnet piece 2a, which is similarly coated with an adhesive on the inner peripheral surface of the arc, is connected to one end of the spacing piece 3a that has already been attached to the rotor core 1. It is placed adjacent to the side and adhered to the rotor core 1. When this divided magnet piece 2a is bonded to the rotor core, the position of the divided magnet piece 2a is adjusted by bringing the end face of the divided magnet piece 2a facing the gap piece 3a into contact with the end face of the gap piece 3a. I can decide.
[0022]
Subsequently, as shown in FIG. 2C, a second spacing piece 3 b is placed adjacent to the divided magnet piece 2 a bonded to the rotor core 1 and bonded to the rotor core 1. Also in this case, the arrangement position of the spacing piece 3b is automatically determined by placing the end piece so that the end face thereof is in contact with the end face of the divided magnet piece 1a.
[0023]
Thereafter, similarly, the divided magnet pieces 2 and the spacing pieces 3 are arranged adjacent to each other on the outer peripheral surface of the rotor core 1 with the end faces alternately in close contact with each other, and all four divided magnet pieces 2 and the spacing pieces 3 are arranged in the rotor core. 2, the split magnet pieces 2 a to 2 d and the spacing pieces 3 a to 3 d are attached to the entire circumference of the outer periphery of the rotor core 1 with the end portions in close contact with each other, as shown in FIG. The completed rotor is completed.
[0024]
After this, if the adhesive strength of the adhesive that bonds the split magnet piece and the spacing piece to the rotor core is sufficient, it can be left as it is. In order to prevent the spacing pieces from scattering, a reinforcing ring 5 made of a nonmagnetic material is attached to the outer periphery of the divided magnet pieces and the spacing pieces as shown in FIG.
[0025]
In the above embodiment, the segmented magnet pieces 2 and the spacing pieces 3 are arranged in a fixed direction on the outer periphery of the rotor core 1, but in the present invention, the invention is not limited to this. From the state of FIG. 2 (a), the divided magnet pieces and the spacing pieces are arranged in such an order that the divided magnet pieces 2a and 2d are respectively placed adjacent to both sides of the spacing piece 3a bonded to the rotor core 1. It can also be arranged. Also in this case, a special arrangement is made by arranging the segmented magnet pieces or the segmented pieces to be arranged later in contact with the end surfaces of the segmented or segmented magnet pieces previously bonded to the rotor core 1 without leaving a gap. The position of each piece can be determined without using a jig. The adhesive may be applied to the outer peripheral surface or inner peripheral surface of at least one of the rotor core, the split magnet, and the spacing piece.
[0026]
【The invention's effect】
The present invention relates to a rotor of a permanent magnet type rotating electrical machine, a split magnet piece of a permanent magnet of a predetermined size divided into a number corresponding to the number of poles, and a spacing piece of a non-magnetic material of the same size as the split magnet piece. The divided magnet pieces and the spacing pieces are alternately arranged on the outer peripheral surface of the rotor core, with the ends of the rotor core being in close contact with each other without a gap, and arranged on the outer periphery of the rotor core. Since it is made to affix, a split magnet is used for a permanent magnet, and this split magnet can be arranged in the outer periphery of a rotor core, without using a special assembly jig. Therefore, according to the present invention, the price of the permanent magnet used for the rotor in the permanent magnet type rotating electrical machine can be reduced, and it can be easily assembled without using a special assembly jig. Costs and man-hours can be reduced, and productivity can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram for explaining a rotor assembling process according to the present invention;
FIG. 3 is a perspective view showing an assembly process of a conventional rotor.
FIG. 4 is a side view showing a configuration of a conventional rotor.
[Explanation of symbols]
1: Rotor core 2: Split magnet piece 3: Spacing piece 5: Reinforcement ring

Claims (1)

In a rotor of a permanent magnet type rotating electrical machine that uses a permanent magnet as a field pole, a divided magnet piece of a permanent magnet of a predetermined size divided into a number corresponding to the number of poles and a non-magnetic of a predetermined size equal to the number of the divided magnet pieces The separated magnet pieces and the spaced pieces are alternately arranged on the outer peripheral surface of the rotor core over the entire circumference, with the ends of the rotor being in close contact with each other, and arranged on the outer periphery of the rotor core. A rotor of a permanent magnet type rotating electrical machine characterized by being attached.

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