JP2816654B2 - Rotor with permanent magnet - Google Patents

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 permanent magnets having a plurality of permanent magnets fixed around the outer periphery 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 periphery, there have been various methods for positioning and fixing the permanent magnets on the outer periphery of a rotor core formed by laminating rotor iron plates. Had been proposed. For example, actual Kaihei 6
No. 57055 discloses an iron plate having the same shape provided with projections at regular intervals on the outer peripheral surface of a laminated iron core, and laminating them by collating the protruding portions to form ridges on the outer peripheral surface. A permanent magnet in which the permanent magnets are parallel to each other is arranged, and the ridge portion and the permanent magnet surface are welded to each other to fix the permanent magnet to the outer periphery of the rotor iron plate. , And a permanent process is required between the ridges and the permanent magnets are arranged between the ridges and then fixed by welding. Japanese Utility Model Application Laid-Open No. Hei 6-21346 discloses that a magnet is fitted between protrusions formed at regular intervals formed on the outer periphery of a core of a rotor core, and a resin-made cylindrical cover is fitted on the outer peripheral surface thereof. Coatings have been proposed.

[0003]

According to the conventional method of fixing a permanent magnet on the outer periphery of a rotor core as described above, a plurality of projections are provided on the outer periphery of a rotor core, and permanent magnets are provided between the projections (projections). Magnets are arranged and the ridges and permanent magnets are welded, the outer peripheral surface of this permanent magnet is wrapped with an insulating tape such as glass tape, or the outside is coated with resin, and manufactured by a method such as resin molding. I was However, since permanent magnets are generally made of brittle ferrite, etc., when pushing the permanent magnet between the protrusions on the outer peripheral surface of the rotor core, if the protrusions are hard, the corners of the permanent magnet may be damaged or forced in. Since the permanent magnet is broken during the operation, it is necessary to provide a gap between the projection and the projection so that the permanent magnet does not contact the projection. For this reason, a wide range of resin impregnated tape is wound around the outer peripheral surface to prevent the permanent magnet from flying out due to the centrifugal force. It was difficult to manufacture a rotating rotor core. Also, the manufacturing process was complicated in order to prevent the displacement. Furthermore,
After the permanent magnets are arranged, a cylinder is fitted and covered on the outer peripheral surface of the entire rotor core.However, in this case, a cost is increased due to the necessity of a cylindrical cover, and it cannot be manufactured at a low cost. Was.

[0004] In these conventional fixing methods, in terms of performance, metal-based projections are arranged between permanent magnets arranged on the outer periphery, and beads or the like formed on the surface by fusion by heating the whole. This causes a gap between the stator and the rotor, resulting in magnetic leakage, which is not preferable in terms of the magnetic efficiency of the generator. Further, the conventional rotor core is fragile against contact and impact, and it is an important issue how to position and fix the permanent magnet on the field core without damaging the permanent magnet. The present invention is to improve such a complicated fixing method and to provide a rotor with a permanent magnet for fixing a permanent magnet to a rotor core by a simple method.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotor core comprising a plurality of rotor iron plates laminated and fixed at predetermined intervals on an outer periphery of a rotor core. In a rotor with a permanent magnet having end plates arranged on both sides of an iron core, a plurality of trapezoidal grooves are formed on the outer periphery of the rotor iron plate.
Rotor formed by laminating this rotor iron plate
Non-magnetic material in the trapezoidal groove of the iron core, on both sides of the upper part 4a
Form a projection and form the upper surface of this projection on an inclined surface
Insert a flexible fixing member with a U-shaped cross section
Push the permanent magnet between the fixed members
The end plates are attached to both end faces in the axial direction of the rotor core.
The object can be achieved by sandwiching the rotor iron plates arranged and laminated .

Another object of the present invention is to bury the rotor core in an outer peripheral surface thereof and to position the rotor core by the fixing member.
The non-magnetic insulating tape containing glass fibers for fixing to the outer surface of the permanent magnets of the end plates can be achieved by forming by winding.
Further, the fixing member is formed in an E-shaped cross section, and the upper side is formed to be thinner toward the lower center, and the bottom is formed in a wide trapezoidal shape, so that the fixing member is formed outside the rotor core. The permanent magnet can be fitted and fixed in the groove of the shape, and the permanent magnet can be pushed in along the inclined surface from above the fixing member for positioning. Further, the end plates disposed at both ends of the rotor core in which the rotor iron plates are laminated are a number of wing pieces on the outer surface integrally formed by extraction molding, that is,
By using the end plate provided with the cooling blades, a rotor with a permanent magnet having a simple structure can be obtained.

[0007]

According to the rotor with permanent magnet of the present invention, the trapezoidal grooves formed at regular intervals on the outer periphery of the field iron core constituting the rotor form the nonmagnetic material in the trapezoidal grooves formed by laminating the rotor iron plates. Since the trapezoidal fixing member is inserted and fixed, and a permanent magnet is pushed between the fixing members to form a field core, the amount of magnetic leakage due to a gap generated between the permanent magnets can be reduced. Therefore, the rotor has a small permanent magnet because of its excellent magnetic efficiency. In addition, by forming the fixing member or the like by extraction molding with a synthetic resin or the like, it is possible to prevent the fragile permanent magnets that come into contact with the corners from being lost. Further, since the shape of the fixing member to be fitted into the trapezoidal groove on the outer periphery of the field core is formed in an E-shaped cross section, the permanent magnet can be pushed and fixed between the fixing members. In addition, a non-magnetic insulating tape containing glass fiber is wound around the outer surface of the rotor with permanent magnets to reduce the gap between the permanent magnet and the field core of the rotor. It is possible to prevent the displacement of the permanent magnet during the operation and to manufacture a stable rotor with the permanent magnet.

[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 of the present invention. FIG. 2 is a partial sectional view of FIG. 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 permanent magnet of the present invention. FIG. 6 is an enlarged plan view of a main part of a 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.

A structure will be described based on an embodiment of a rotor with a permanent magnet of the present invention. The rotor body 1 is formed by laminating rotor iron plates 3, 3,... Made of thin iron plates.
3 and fixing members 4 arranged at regular intervals on the outer peripheral surface thereof
4. Both are sandwiched between the end plates 2 and 2 on both ends,
It is formed by fixing with bolts 5, 5,. The fixing member 4 can be of any shape without any specific sectional shape, and can be manufactured by extraction molding using an elastic synthetic resin such as nylon.
For example, the upper part 4a may be formed to have an inclined surface by narrowing both sides toward the lower center, and the bottom part 4b may be formed to have a wide trapezoidal shape as shown in FIG. Good. Reference numeral 6 denotes a permanent magnet that is positioned and fixed between the fixing members 4, 4,... Disposed on the outer peripheral surface of the laminated rotor iron plates 3, 3,. Reference numeral 7 denotes a trapezoidal fitting groove formed at regular intervals on the outer periphery of the rotor iron plate 3.
4. Fit bottom 4b. Reference numeral 8 denotes a rotation axis of the field iron core.

In the rotor with permanent magnet thus formed, the rotating shaft 8 is inserted into a rotating shaft hole formed by laminating the rotor iron plates 3, 3,. The fixing members 4, 4,... Are fitted into the trapezoidal fitting grooves 7 on the surface. The end plates 2 and 2 are sandwiched from both sides, and tightened and fixed with bolts 5, 5,. Next, the permanent magnets 6, 6,... Are pushed and loaded along the inclined surface of the upper part 4a into the space formed by the fixing members 4, 4,. Thus, the permanent magnets 6, 6,... Are positioned and fixed between the fixing members 4, 4 on the entire outer periphery. The permanent magnets 6, 6,... Are fixed by 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 or the like is wound around the outer peripheral surfaces of the permanent magnets 6, 6 and the fixing members 4, 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,.

[0011] will be explained in the second embodiment shown in FIG. 5 of the rotor with the permanent magnets of the present invention. Reference numeral 12 denotes a molded end plate formed by resin molding in which rotor iron plates 3, 3,... Are arranged at both ends in a laminated state, and wing pieces 13, 13,. , 14 ... project. An engaging joint 15 is formed at the tip of the beam 14 so as to engage with the engaging joint 15a of the beam 14a of the opposite end plate 12a on the opposite side. This beam 1
Reference numerals 4 and 14a fit into the trapezoidal grooves of the field iron core similarly to the fixing member 4 of the first embodiment. The opposing beams 14, 14a
Of the first pair by the engagement of the respective engagement knits 15, 15a.
The same function as the fixing member 4 of the embodiment is performed.
(See FIG. 6) .

In this second embodiment, a molded end plate 12 and molded end plates 12a are provided on both sides of laminated rotor iron plates 3, 3,.
And overhang inside the formed end plates 12 and 12a.
Gloves 15, 15a of the beam members 14, 14 having an E-shaped cross section
The be pinched the rotor iron plate 3,3 ... from both sides to suit seen mesh. Next, the beams 14, 14a and the formed end plates 12,
Cross section d-shaped permanent magnet 6, 6 ... surrounded by space 12a
Push along the upper inclined surface of the rotor,
..Besides the field iron core formed by beams 14,14,
The permanent magnet 6 is fixed in a space formed between the molded end plates 14a and 14a . Then, in the same manner as in the first embodiment, a tape or the like containing glass fiber is wound around the outer peripheral surface to manufacture a rotor with a permanent magnet. Heat such a tape wound in a drying oven,
The surface can be smoothed by fusing the synthetic resin. Haritai 1 The end plate 12,12a of the second embodiment which protrudes inwardly Ri by the forming of synthetic resin or the like
4. It can be manufactured by extraction molding or the like in a state where the projections 16 and the wing pieces 13 projecting outward are integrated.

[0013]

Since the rotor with permanent magnet of the present invention is constructed as described above, the permanent magnet can be easily positioned by pushing the permanent magnet between the fixing member made of synthetic resin and the end plate. Can be. Moreover, since the fixing member is formed of an elastic synthetic resin, the permanent magnet can be fixed without causing any damage such as breakage when fitting the permanent magnet. Since the non-magnetic material is disposed between the permanent magnets disposed on the outer peripheral surface of the rotor core, the leakage magnetic flux between the magnets can be reduced as much as possible, and the power generation efficiency is improved.

[Brief description of the 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 fixing member embedded in a rotor with a permanent magnet.

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

FIG. 6 is an enlarged plan view of a main 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]

DESCRIPTION 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 Wing piece 14, 14a Beam 15, 15a Engagement joint

Continuation of the front page (72) Inventor Hirotaka Yamamoto 2-8-65 Yoshinodai, Kawagoe-shi, Saitama Denyo Co., Ltd. Saitama Plant (56) References JP-A-4-42743 (JP, A) Kaihei 2-95149 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H02K 1/27 501

Claims (4)

(57) [Claims] 1. A rotor with permanent magnets comprising a plurality of permanent magnets arranged and fixed at predetermined intervals on the outer periphery of a rotor core in which rotor iron plates are laminated , and end plates arranged on both sides of the rotor core. A plurality of trapezoidal grooves formed in the outer periphery of the rotor iron plate.
Before the rotor core formed by laminating the rotor iron plates.
Form a protrusion on both sides of the upper part with a non-magnetic material in the trapezoidal groove.
And the upper surface of this projection is formed as an inclined surface.
The permanent magnet is inserted between the fixing members, and the permanent magnet is pushed and buried between the fixing members to form a rotor core.
A rotor with permanent magnets, characterized in that the rotor iron plates, which are provided by arranging the end plates on both end surfaces in the axial direction of a rotor iron core , are sandwiched therebetween. 2. The fixing member is formed of a synthetic resin.
The rotor with a permanent magnet according to claim 1, wherein: 3. Positioning and embedding on the outer peripheral surface of the rotor core
The outer surface of the permanent magnet contains glass fiber for fixing
Permanent rotor with magnets according to claim 1 or 2, characterized in Rukoto such to form a non-magnetic insulating tape wound. 4. A plurality of wing pieces projecting from the outer surface at predetermined intervals.
End plates are disposed on both end faces in the axial direction of the field core, and bolts are
3. The method according to claim 1, wherein the first and second members are fastened together.
Or a rotor with a permanent magnet according to 3 .