JPH08223833A - Rotor with permanent magnet - Google Patents

Abstract

PURPOSE: To fasten permanent magnetic simply to a rotor core, by filling fastening members made of a non-magnetic material into trapezoidal grooves provided on the outer peripheral surface of the rotor core, and by squeezing in a burying way the respective permanent magnetic into the respective spaces between the respective adjacent fastening members to give a field core, and further, by sandwiching the rotor core between the end plates which are provided on both axial end surfaces of the field core. CONSTITUTION: Into the shaft hole of a laminated rotor core formed of iron plates 3, the shaft of the rotor core is fitted into a fixing groove. Fastening members 4 are fitted into trapezoidal engaging grooves provided on the outer peripheral surface of the rotor core. End plates are provided in a sandwiching way on both axial end surfaces of the rotor core, and they are fixed on the rotor core through the clamping by bolts. Then, into the space formed out of the adjacent fastening members 4 and the above end plates, each permanent magnet 6 is squeezed in a mounting way along the inclined surface of an upper part 4a of the fastening member 4. In this manner, the permanent magnets 6 are fixed in place between the respective adjacent fastening members 4 over the whole outer periphery of the rotor core. Each permanent magnet 6 is fastened to the rotor core by the protrusions of the upper parts 4a of the adjacent fastening members 4. Thereby, the permanent magnets 6 can be fastened simply to the rotor core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor core of a permanent magnet generator, and more particularly to a rotor with a permanent magnet having a plurality of permanent magnets fixed around the outer circumference of the rotor core.

[0002]

2. Description of the Related Art In a rotor in which permanent magnets of a permanent magnet type generator are arranged on the outer circumference, various methods have been used since ancient times for positioning and fixing the permanent magnets on the outer circumference of a rotor core formed by laminating rotor iron plates. Was proposed. For example, the actual Kaihei 6
No. 57055 gazette discloses an iron plate of the same shape having protrusions at regular intervals on the outer peripheral surface of a laminated iron core, and the protrusions are collated to form protrusions on the outer peripheral surface. It has been proposed to arrange arc-shaped permanent magnets in parallel with each other, and to fix the permanent magnets to the outer circumference of the rotor iron plate by welding the ridge portion and the permanent magnet surface. After contacting the ridges with each other and disposing the permanent magnets between the ridges, a complicated process such as fixing by welding is required. Further, in Japanese Utility Model Laid-Open No. 6-21346, a magnet is fitted between protrusions at regular intervals formed on the outer circumference of the core of a rotor core, and a resin cylindrical cover is fitted on the outer circumferential surface of the rotor core. The one coated with is proposed.

[0003]

In the conventional method of fixing the permanent magnet to the outer circumference of the rotor core as described above, a plurality of projections are provided on the outer circumference of the rotor core, and the permanent magnets are provided between the projections (protrusions). A magnet is placed and the ridge and the permanent magnet are welded together, the outer peripheral surface of this permanent magnet is wrapped with an insulating tape such as glass tape, or the outside is coated with a resin, which is manufactured by a method such as resin molding. Was there. However, since permanent magnets are generally composed of brittle ferrite, etc., when pushing the permanent magnet between the protrusions on the outer peripheral surface of the rotor iron core, the protrusions are so hard that the corners of the permanent magnet may be missing or forcefully pushed in. Since the permanent magnet is broken during the work, it was necessary to manufacture the protrusion with a gap so that the permanent magnet would not come into contact with the protrusion. Therefore, a wide range of resin-impregnated tape or the like is wound around the outer peripheral surface to prevent the permanent magnet from popping out due to the centrifugal force. It was difficult to manufacture a rotating rotor core. In addition, the manufacturing process was complicated in order to prevent displacement. Furthermore,
After arranging the permanent magnets, it is also possible to fit and cover a cylinder on the outer peripheral surface of the entire rotor core, but in this case, a cylindrical cover is required, resulting in high cost and low cost manufacturing. It was

[0004] In terms of performance, these conventional fixing methods have a problem in that a metal-based protrusion is arranged between permanent magnets arranged on the outer circumference, or a bead formed on the surface by fusion by heating the entire body. As a result, a gap is created between the stator and the rotor, resulting in magnetic leakage, which is not preferable in terms of magnetic efficiency of the generator. Further, the conventional rotor core is brittle against contact and impact, and it is an important issue to position and fix the permanent magnet on the field core without damaging the permanent magnet. The present invention improves such a complicated fixing method and provides a rotor with a permanent magnet for fixing a permanent magnet to a rotor core by a simple method.

[0005]

According to the present invention, a plurality of permanent magnets are arranged and fixed at a predetermined interval on the outer circumference of a rotor core,
In a rotor with permanent magnets, in which end plates are arranged on both sides of the rotor iron core, a plurality of trapezoidal grooves are formed on the outer periphery of the rotor iron plate, the rotor iron plates are laminated, and the lamination is performed. A fixed member made of a non-magnetic material is fitted into the trapezoidal groove of the rotor core, and the permanent magnet is pressed between the fixed members to be embedded to form a field core, and both end faces in the axial direction of the field core are The object can be achieved by disposing the end plates and sandwiching the rotor iron plates.

The object of the present invention can also be achieved by extracting and molding the fixing member with a synthetic resin and burying a permanent magnet between the fixing members. In addition, the cross section is E-shaped, and both sides of the upper part are narrowed toward the center of the lower part, and the bottom part is formed in a wide trapezoidal shape, so that this fixing member is in a trapezoidal groove formed outside the rotor core. It is possible to fit and fix the permanent magnet and to position it by pushing the permanent magnet from above the fixing member along the inclined surface.
Further, the end plates arranged at both ends of the rotor iron core, which is formed by laminating the rotor iron plates, are structured by using a large number of blades integrally formed by extraction molding, that is, an end plate provided with cooling fins. Can be a simple rotor with a permanent magnet.

[0007]

The rotor with a permanent magnet according to the present invention has a trapezoidal groove formed at a constant interval on the outer circumference of the field core constituting the rotor, and the trapezoidal groove formed by laminating the rotor iron plates is made of a non-magnetic material. Since the trapezoidal fixing member is inserted and fixed and the permanent magnet is pushed between the fixing members to form the field iron core, the amount of magnetic leakage due to the gap generated between the permanent magnets can be reduced. Therefore, since the magnetic efficiency is excellent, the rotor with a small permanent magnet is obtained. Further, by forming this fixing member by extraction molding with a synthetic resin or the like, it is possible to prevent protrusions (protrusions) of the field iron core and corner defects of the brittle permanent magnet. Further, since this fixing member has a trapezoidal shape and is formed in an E-shaped cross section, it is possible to press and fix the permanent magnet between the fixing members for positioning and fixing. In addition, since the gap between the field core of the rotor and the permanent magnets has been reduced as much as possible, it is possible to prevent displacement of the permanent magnets during taping work and to manufacture a stable rotor with permanent magnets. it can.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a rotor with a permanent magnet according to the present invention. FIG. 2 is a partial cross-sectional view of FIG. 3 is an enlarged view of a main part of FIG. 2, and FIG. 4 is a perspective view of a resin fixing member embedded in the rotor with a permanent magnet. FIG. 5 is a perspective view of an end plate showing a second embodiment of the rotor with a permanent magnet of the present invention. FIG. 6 is an enlarged plan view of an essential part of the rotor with a permanent magnet according to the second embodiment. FIG. 7 is a front view of a rotor iron plate used in the present invention.

The structure will be described based on an embodiment of the rotor with a permanent magnet of the present invention. The rotor body 1 is formed by laminating rotor iron plates 3, 3 ...
3 ··· and fixing members 4, which are arranged on the outer peripheral surface thereof at regular intervals
4 ... Both are clamped by the end plates 2 and 2 on both ends,
It is formed by fixing with bolts 5, 5 ... This fixing member 4 can be used in any shape without specifying its cross-sectional shape, and can be manufactured by extraction molding using an elastic synthetic resin such as nylon.
For example, even if it is formed in a V-shaped cross-section as shown in FIG. 4, its upper portion 4a is formed so that both sides are narrowed toward the lower center to form an inclined surface, and the bottom portion 4b is widened to be trapezoidal. Good. Reference numeral 6 denotes a permanent magnet which is positioned and fixed between the fixing members 4, 4, ... Which are arranged on the outer peripheral surfaces of the laminated rotor iron plates 3, 3. Reference numeral 7 denotes a trapezoidal fitting groove formed on the outer periphery of the rotor iron plate 3 at regular intervals.
Insert the bottom 4b of 4 ... Reference numeral 8 is a rotating shaft of the field iron core.

In the rotor with permanent magnets formed in this manner, the rotary shaft 8 is inserted into the rotary shaft hole formed by laminating the rotor iron plates 3, 3, ... The fixing members 4, 4, ... Are fitted into the trapezoidal fitting groove 7 on the surface. The end plates 2 and 2 are clamped from both sides, and the bolts 5 and 5 are tightened and fixed. Next, permanent magnets 6, 6 ... Are pushed into the space formed by the fixing members 4, 4 ... And the end plates 2 and 2 along the inclined surface of the upper portion 4a and loaded. In this way, the permanent magnets 6, 6 ... Are positioned and fixed between the fixing members 4, 4 on the entire outer circumference. The permanent magnets 6, 6, ... Are fixed by the protrusions of the upper portions 4a of the fixing members 4, 4 ,. A non-magnetic insulating tape such as a glass tape impregnated with resin is wound around the outer peripheral surfaces of the permanent magnets 6 and 6 and the fixing members 4 and 4, and the entire field iron core is placed in a heating furnace such as a drying furnace. It is possible to prevent the permanent magnets 6, 6 ... from popping out by heating and fusing with a resin.

A second embodiment of the rotor with permanent magnets according to the present invention shown in FIG. 5 will be described. 12 is rotor iron plate 3,3
.. are placed at both ends in a laminated state, and the fins 13 are provided on the outside.
.. is a molded end plate with a plurality of beam bodies 14, 14 ... An engaging member 15 is formed at the tip of the beam body 14, and the end plate 12a on the opposite side is formed.
It is adapted to be engaged with the engagement member 15a of the beam body 14a. This engagement serves the same role as the fixing member 4 of the first embodiment (see FIG. 6). Protrusions 16 for pressing the rotor iron plate 3 are formed inside the outer peripheral edges of the molded end plate 12 and the molded end plate 12a.

In the second embodiment, the forming end plate 12 and the forming end plate 12a are provided on both sides of the laminated rotor iron plates 3, 3 ...
Are arranged, and the engaging joint 15 and the beam 1 of each beam 14 are arranged.
4a is engaged with the engaging member 15a to engage the rotor iron plates 3, 3 ...
Firmly clamps. Next, the permanent magnets 6, 6, ... Are forcedly pushed along the upper inclined surface into the space surrounded by the beam body 14, the beam body 14a, and the molding end plates 12, 12a, and the rotor iron plates 3, 3 ,. The permanent magnet 6 is fixed to the outside of the field iron core formed in. Then, similarly to the first embodiment, a glass tape or the like is wound around the outer peripheral surface to manufacture a rotor with a permanent magnet. A wound glass tape of this kind can be heated in a drying oven to fuse synthetic resin and smooth the surface. The end plates 12 and 12a of the second embodiment can be manufactured by extraction molding or the like with the beam body 14 and the fins 13 integrated with each other by forming the end plates 12 and 12a from synthetic resin or the like.

[0013]

Since the rotor with a permanent magnet of the present invention is constructed as described above, the permanent magnet can be easily positioned by pushing it into the fixed frame made of synthetic resin. Moreover, since the fixing frame is made of elastic synthetic resin, the permanent magnet can be fixed without causing damage such as chipping when the permanent magnet is fitted. Therefore, since the non-magnetic material is arranged between the permanent magnets, the leakage magnetic flux between the magnets can be minimized and the power generation efficiency is improved. .

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a rotor with a permanent magnet according to the present invention.

FIG. 2 is a partial cross-sectional view of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a perspective view of a resin-made fixing member embedded in the rotor with a permanent magnet.

FIG. 5 is a perspective view of an end plate showing a second embodiment of the rotor with a permanent magnet of the present invention.

FIG. 6 is an enlarged plan view of an essential part of a rotor with a permanent magnet according to a second embodiment.

FIG. 7 is a front view of a rotor iron plate used in the present invention.

[Explanation of symbols]

 1 Rotor main body 2 End plate 3 Rotor iron plate 4 Fixing member 5 Bolt 6 Permanent magnet 7 Fitting groove 8 Rotating shaft 12,12a Molded end plate 13,13a Fin 14,14a Beam body 15,15a Engagement hand

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirotaka Yamamoto 2-865 Yoshinodai, Kawagoe City, Saitama Denyo Co., Ltd. Saitama Factory

Claims (5)

[Claims] 1. A rotor with a permanent magnet, wherein a plurality of permanent magnets are arranged and fixed at a predetermined interval on the outer circumference of a rotor core, and end plates are arranged on both sides of the rotor core. A plurality of trapezoidal grooves are formed on the outer circumference of the iron plate, the rotor iron plates are stacked, and a non-magnetic fixing member is inserted into the trapezoidal groove of the stacked rotor iron core. A field magnet core is formed by pushing the permanent magnet between them, and the end plates are disposed on both axial end faces of the field core, and the rotor iron plate is sandwiched between the permanent magnets. Rotor. 2. The rotor with a permanent magnet according to claim 1, wherein the fixing member is made of synthetic resin. 3. A non-magnetic insulating tape containing a glass fiber for fixing is wound around the outer surface of a permanent magnet positioned and embedded in the outer peripheral surface of the rotor core. The rotor with a permanent magnet according to 1 or 2. 4. An end plate having a plurality of blade pieces projecting from the outer surface at predetermined intervals is arranged on both end surfaces in the axial direction of the field core, and is fastened with bolts or the like. Item 1,
The rotor with permanent magnets according to 2 and 3. 5. The fixing member has an E-shaped cross section, and the permanent magnets can be fixed to both sides of the upper surface of the fixing member.
The rotor with permanent magnets according to 2, 3, and 4.