JP2015220974A - Permanent magnet for rotor core for permanent magnet rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet for a rotor core, which can be buried such that the permanent magnet is fixed in a slot of the rotor core of a permanent magnet rotary electric machine simply by being inserted into the slot, the permanent magnet being easily inserted without damaging a magnet element of the permanent magnet in the insertion operation.SOLUTION: A permanent magnet according to the invention comprises: a plate-like magnet element 3 having a magnetic pole face 3Y, right and left side faces 3X and upper and lower end faces 3Z; a first molded part 61 formed at a corner part 3A and the side faces 3X of the magnet element 3; and a second molded part 62 formed in close contact with the first molding part 61 in a portion of the magnetic pole face 3Y near the corner part 3A. The first molded part 61 and the second molded part 62 are integrally molded from the same synthetic resin material into the magnet element 3. In a rotor core for a permanent magnet rotary electric machine, the first molded part 61 and the second molded part 62 are formed as an insertion guide part 6.

Description

The present invention relates to a permanent magnet for a rotor core of a permanent magnet type rotating electrical machine.

A permanent magnet type rotating electric machine in which a permanent magnet is embedded in a slot of a rotor core is known as an embedded magnet type electric motor as an electric motor, and this embedded magnet type electric motor is generally applicable to high speed rotation as an IPM motor. It is used as a motor for automobiles. In this embedded magnet type electric motor, for example, as shown in Patent Document 1, permanent magnets serving as field magnets are inserted into a large number of receiving holes (corresponding to slots of the present application) formed in a rotor core of a laminated steel plate. In order to further increase the magnetic flux component that contributes to torque, slits are formed at both ends of the accommodation hole, and the slit is filled with a resin (synthetic resin) such as an epoxy resin so that the permanent magnet and the rotor core are in close contact with each other. The stress concentration at the circumferential end of the permanent magnet (the left and right ends of the magnet element) is alleviated, cracking of the permanent magnet is prevented, centrifugal strength is improved, and motor performance is improved. It has been proposed.

However, when the permanent magnet according to Patent Document 1 is inserted into the slot of the rotor core and embedded, a resin filling operation is required.

Further, in Patent Document 2, a permanent magnet and a resin member (synthetic resin material) are simultaneously inserted into a magnet insertion hole (corresponding to a slot of the present application) of a rotor core, so that the above filling operation is not required, and a magnet is formed by a resin member. It has been proposed to fix the permanent magnet to the insertion hole. When the permanent magnet and the resin member are simultaneously inserted into the magnet insertion hole, the permanent magnet and the resin member are integrated in advance and then inserted into the magnet insertion hole. Have been proposed to embed.

However, since the permanent magnet according to Patent Document 2 is integrated with the resin member and inserted into the magnet insertion hole of the rotor core and embedded, the resin member is not filled, but in this insertion operation, the permanent magnet and the resin member It is not considered to be integrated so as not to separate.

Further, in Patent Document 3, as an embedded magnet rotor that has an easy assembly process and suppresses breakage of a magnet (permanent magnet) and the rotor to improve reliability, a stainless steel material is provided on the magnetic pole surfaces on both sides of the magnet. A metal plate such as aluminum or aluminum material is placed, and an elastic body such as rubber material is interposed between the magnet and one metal plate, and this is inserted into a slot of the rotor (rotor core) as a magnet set. The elastic body deforms moderately and is in close contact with the magnet and the metal plate, making it easy to insert. Even if the rotor acts at high speed and centrifugal force is applied, the metal sandwiching the magnet and elastic body The gap between the plate and the slot of the rotor can be suppressed by the expansion of the elastic body. As a result, collision between the magnet and the slot of the rotor can be avoided, and cracking and breakage of the magnet can be prevented. Door has been proposed that it is possible.

However, in the magnet (permanent magnet) according to Patent Document 3, the metal plate and the elastic body are provided at the magnetic pole surface portion, and no insertion guide is formed. Therefore, in the operation of inserting the permanent magnet into the slot of the rotor core. In order to ensure smooth insertion, it is necessary to take measures to prevent noise caused by contact between the metal plate and the rotor core.

Japanese Patent Laid-Open No. 2002-359942 JP 2014-45634 A Japanese Patent Laid-Open No. 2005-20819

In order to solve the above-mentioned problems, the present invention can be embedded in a slot of the rotor core only by inserting the permanent magnet into the slot of the rotor core of the permanent magnet type rotating electric machine. An object of the present invention is to provide a permanent magnet for a rotor core of a permanent magnet type rotating electrical machine that is easy to insert without breaking the magnet element.

The invention according to claim 1 relating to a permanent magnet for a rotor core of a permanent magnet type rotating electric machine according to the present invention is the plate-like permanent magnet inserted into the slot of the rotor core of the permanent magnet type rotating electric machine, wherein the magnetic pole surface and the magnetic pole A plate-shaped magnet element having side surfaces on the left and right sides of the surface and end surfaces on the upper and lower sides, a first molded part formed on the corners and side surfaces of the magnet element, and a portion of the magnetic pole surface in the vicinity of the corners The second molded part formed in close contact with the first molded part, and the first molded part and the second molded part are integrally molded into the magnet element with the same synthetic resin material, The first molding part and the second molding part serve as an insertion guide part. The invention described in claim 2 is the permanent magnet for a rotor core of the permanent magnet type rotating electric machine according to claim 1, wherein the surface of the magnet element is a thin film made of an antioxidant that prevents corrosion of the magnet element in advance. A protective layer is formed, and the first molded portion and the second molded portion are formed integrally with the magnet element through the protective layer. The invention according to claim 3 is the permanent magnet for a rotor core of the permanent magnet type rotating electrical machine according to claim 2, wherein the protective layer, the first molded part and the second molded part are made of the same synthetic resin material. It is characterized by. The invention according to claim 4 is the permanent magnet for a rotor core of the permanent magnet type rotating electric machine according to any one of claims 1 to 3, wherein the first magnet is provided at the corner portion of the magnet element on the end surface. A third molded part formed in close contact with the molded part and the second molded part is integrally formed with the magnet element with the same synthetic resin material to form an insertion guide part. The invention according to claim 5 is the permanent magnet for a rotor core of the permanent magnet type rotating electric machine according to any one of claims 1 to 4, wherein the first molded part is made of an elastic material. And

A permanent magnet for a rotor core of a permanent magnet type rotating electrical machine of the present invention includes a plate-like magnet element having a magnetic pole surface, side surfaces on the left and right sides of the magnetic pole surface, and upper and lower end surfaces, and corners and side surfaces of the magnet element. A first molding portion to be formed, and a second molding portion that is formed in close contact with the first molding portion at a portion of the magnetic pole surface in the vicinity of the corner portion, and the first molding portion Since the second molding part is integrally molded with the magnet element using the same synthetic resin material, and the first molding part and the second molding part serve as the insertion guide part, the rotor core of the permanent magnet type rotating electrical machine The first molding part and the second molding part are not separated into the slot, and the magnet element can be easily inserted without being damaged. Further, the third molded part formed on the end face is in close contact with the first molded part and the second molded part at the corner of the magnet element, and is integrally molded with the magnet element with the same synthetic resin material. Since the insertion guide portion is used, the first molded portion, the second molded portion, and the third molded portion are not further separated, and the magnetic element is easily inserted without being damaged. Can do.

It is a top view which shows the permanent magnet for rotor cores of Embodiment 1 of this invention. It is a front view which shows the permanent magnet for rotor cores same as the above. It is sectional drawing in which the protective layer was formed on the surface of the permanent magnet element same as the above. It is sectional drawing in which the surface treatment layer was formed in the protective layer of a permanent magnet element same as the above. It is AA sectional drawing of FIG. It is the elements on larger scale which show the surface treatment layer by which the surface of the magnet element same as the above was roughened. It is sectional drawing of the permanent magnet for rotor cores which does not have a surface treatment layer same as the above. It is a top view which shows the rotor which embedded the permanent magnet for rotor cores same as the above. It is BB sectional drawing of FIG. It is a top view which shows the permanent magnet for rotor cores of Embodiment 2 of this invention. It is a front view which shows the permanent magnet for rotor cores same as the above. It is a top view which shows the rotor which embedded the permanent magnet for rotor cores same as the above. It is a top view which shows the permanent magnet for rotor cores of Embodiment 3 of this invention. It is a top view which shows a part of rotor which embedded the permanent magnet for rotor cores same as the above. It is a top view which shows the permanent magnet for rotor cores of Embodiment 4 of this invention. It is a top view of the partial cross section which shows the permanent magnet for rotor cores of Embodiment 5 of this invention. It is a top view which shows the permanent magnet for rotor cores of Embodiment 6 of this invention.

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 to 6 and 7 show a permanent magnet for a rotor core of a permanent magnet type rotating electrical machine. The magnet element 3 is a rectangular plate material, which has a magnetic pole surface 3Y and left and right side surfaces 3X as shown in FIG. 3, has end surfaces 3Z up and down as shown in FIG. 2, and left and right ends of the side surface 3X. Corners 3A are formed at the left and right end portions 3B of the portion 3B, that is, the magnetic pole element 3. The left and right side surfaces 3X are in the circumferential direction of the rotor core 11, and the magnetic pole surface 3Y faces the stator (not shown) through the rotor core 11 (not shown). As the material of the magnet element 3, a neodymium magnet obtained by adding iron and boron to neodymium, a samarium cobalt magnet made of an alloy of samarium and cobalt, a ferrite magnet mainly made of iron oxide powder, aluminum, nickel, cobalt, etc. A sintered magnet such as an alnico magnet as a raw material can be exemplified. In order to prevent oxidation of these magnet elements 3, a protective layer 4 is formed on the entire surface of the magnet element 3, that is, the magnetic pole surface 3Y, the side surface 3X, and the end surface 3Z. The protective layer 4 is made of a synthetic resin layer formed by painting or integral molding of a synthetic resin material or a metal layer formed by nickel plating, aluminum ion plating, or the like, and has a small gap when embedded in the rotor core 11. Therefore, it is preferable to form a thin film. In addition, although the sintered magnet was illustrated as a raw material of the magnet element 3, the bonded magnet which shape | molded the rare earth iron-type alloy magnetic powder and the synthetic resin binder may be sufficient. In this bonded magnet, the protective layer 4 does not have to be formed by mixing the antioxidant of the magnet element 3, so the surface of the magnet element 3 or the surface of the protective layer 4 is illustrated in each figure. In this sense, 3 (4) (31 (4) in FIGS. 13 and 14) is described.

In FIG. 4, the surface treatment layer 5 is provided on the surface of the protective layer 4 at the surface corresponding to the side surface 3X of the magnet element 3 and the surface of the protective layer 4 near the corner 3A on the magnetic pole surface 3Y of the magnet element 3. Is formed. The surface treatment layer 5 is not formed on the entire surface of the end surface 3Z of the magnet element 3, and the first molding portion 61, the second molding portion 62, and the protective layer constituting the insertion guide portion 6 as will be described later. 4 is a surface treatment for tightly bonding to 4. The surface treatment layer 5 may be any of mercapto group, thiocarbonyl group, cyano group, isocyanate group, amino group, ammonium group, pyridinium group, azinyl group, carboxyl group, benzotriazole group, triazine thiol group, etc. The thin film layer formed by apply | coating the adhesive agent which consists of a chemical processing agent which combined these is illustrated.

Thus, after forming the surface treatment layer 5 on the surface of the protective layer 4, as shown in FIG. 5, the surface of the surface treatment layer 5 of the protective layer 4 on the side surface 3X of the magnet element 3 can be made of a synthetic resin material. In addition, a first molding portion 61 and a second molding portion 62 made of a synthetic resin material are formed on the surface of the surface treatment layer 5 of the protective layer 4 in the vicinity of the corner portion 3A of the magnet element 3. The first molding part 61 and the second molding part 62 are integrally formed of the same material by a molding die and are magnetized via a surface treatment layer 5 made of a thin film layer of an adhesive made of a chemical treatment agent. The element 3 is bonded in close contact. In this way, the rotor core permanent magnet 2 in which the insertion guide portions 6 are formed at the left and right end portions 3 of the magnet element 3 is obtained. As shown in FIG. 2, the corner portion of the insertion guide portion 6 is formed with a tapered portion 6A on the upper and lower ends or on one of the end surfaces 3Z. In addition, as a raw material of the 1st shaping | molding part 61 and the 2nd shaping | molding part 62, thermoplastic resins, such as polyphenylene sulfide resin, thermosetting resins, such as an epoxy resin and a phenol resin, and rubbers, such as silicon rubber and a fluorine rubber Can be illustrated.

FIG. 6 shows a surface treatment layer 51 formed on the surface of the same portion of the protective layer 4. The surface treatment layer 51 is formed with minute irregularities in place of a thin film layer formed by applying an adhesive made of a chemical treatment agent as shown in FIG. In FIG. 6, the synthetic resin material molded by the first molding part 61 and the second molding part 62 is formed on the side surface 3X of the magnet element 3 so that the magnet element 3 and the protective layer 4 can be physically joined. The portion of the protective layer 4 formed in the vicinity of the corner 3A with the protective layer 4 and the magnetic pole surface 3Y is irradiated with laser, and fine irregularities are formed on the surface of the protective layer 4 and the magnet element 3 by this laser irradiation. The surface treatment layer 51 is obtained. In this case, the laser irradiation method is preferably performed so that the synthetic resin material to be molded and the magnet element 3 can be firmly and tightly joined by the anchor effect, so that the oxidative corrosion of the magnet element 3 is not caused by the laser irradiation. There is a need to.

As described above, the first molded portion 61 formed on the corner 3A and the side surface 3X of the magnetic element 3 and the first molded portion 61 formed in close contact with the magnetic pole surface 3Y near the corner 3A. The rotor core permanent magnet 2 having the insertion guide portion 6 is obtained by integrally molding the first molding portion 61 and the second molding portion 62 into the magnet element 3 with the same synthetic resin material. It is done.

In the rotor core permanent magnet 2, the insertion guide portion 6 needs to be tightly joined to the magnet element 3, and in order to make the tightly joined, the surface of the magnet element 3, that is, the surface of the protective layer 4, FIG. FIG. 7 illustrates the surface treatment processing for forming the surface treatment layers 5 and 51 shown in FIG. 6, but FIG. 7 illustrates that the insertion guide portion 6 is connected to the magnet element 3 without such surface treatment processing. An embodiment in which close bonding is performed is shown.

In FIG. 7, the protective layer 4 is a synthetic resin layer made of a synthetic resin material such as an epoxy resin, and the first molded portion 61 and the second molded portion 62 are integrally molded with the same synthetic resin material as the synthetic resin material. To do. Since the insertion guide part 6 can be tightly bonded to the magnet element 3 by molding in this way, a combination of the material of the protective layer 4 and the material of the first molding part 61 and the second molding part 62 is selected. By doing so, surface treatment processing becomes unnecessary, and the rotor core permanent magnet 2 in which the surface treatment layer 5 is not used can be obtained.

Next, an embodiment in which the rotor core permanent magnet 2 in which the insertion guide portion 6 is formed is inserted and embedded in the rotor core 11 of the rotor 1 of the permanent magnet type rotating electric machine will be described below with reference to FIGS.

8 and 9, the rotor 1 includes a rotor core 11 formed by laminating a plurality of disk-shaped steel plates serving as iron cores, and a plurality (eight in the figure) through holes in the circumferential direction of the rotor core 11. The rotor is composed of a formed slot and a rotor shaft hole 12 to which the rotor shaft is fixed. In the figure, each slot is a through hole having a size that allows the magnet element 3 of the permanent magnet 2 for rotor core and the insertion guide portion 6 to be inserted without a gap. The rotor core permanent magnet 2 is embedded in each slot, the magnetic poles N and S of the magnetic pole surface 3Y are arranged in the radial direction, the left and right side surfaces 3X are in the circumferential direction, and the magnetic poles N and S are alternately distributed. In this way, a stator, which is a stator (not shown), is inserted into the outer peripheral position of the rotor core 11 through a gap so as to form a magnetic circuit with the magnetic poles N and S, and a stator that is a stator (not shown) is incorporated into the permanent magnet type rotation. An electric machine is obtained. In FIG. 9, the end face 3 </ b> Z of the magnet element 3 is closed by a rotor shaft bearing base (not shown) fixed to the rotor shaft hole 12. In this manner, the permanent magnet 2 can be inserted into the slots of the rotor core 11 only by inserting the permanent magnet 2, and the insertion guide portion 6 is not formed on the entire surface of the protective layer 4 on the upper and lower end surfaces 3Z of the magnet element 3. In the insertion operation, the first molding part 61 and the second molding part 62 are not separated, and the magnet element 3 can be easily inserted without being damaged. Further, as shown in FIG. 2, the corner portion of the insertion guide portion 6 is further provided with a tapered portion 6 </ b> A on the upper or lower end or any one of the end surfaces 3 </ b> Z, so that the rotor core permanent magnet 2 is further added to the slot of the rotor core 11. It becomes easier to insert.

(Embodiment 2)
10 to 12 show different embodiments of the insertion guide portion in the permanent magnet for the rotor core of the permanent magnet type rotating electric machine.

10 and 11, the protective layer 4 is formed on the entire surface of the rotor core permanent magnet 2 in the same manner as in the first embodiment. The insertion guide portion 60 of the rotor core permanent magnet 2 is inserted in the insertion guide 60 shown in the first embodiment. A third molding part 63 is added to the guide part 6. The third molding portion 63 is made of the same material as the first molding portion 61 and the second molding portion 62 so as to cover the outer periphery of the left and right end portions 3B of the magnet element 3 with the end surface 3Z, and is in close contact with the magnet element. 3 is integrally formed. In this case, the material of the protective layer 4 may be integrally molded as the same synthetic resin material as the material of the first molding part 61, the second molding part 62, and the third molding part 63 as in the first embodiment. In addition, although not shown in FIG. 11, the corner portion of the insertion guide portion 60 may form a tapered portion 6 </ b> A on the top and bottom or one of the end surfaces 3 </ b> Z as shown in FIG. 2. As described above, the first molded portion 61 formed on the corner 3A and the side surface 3X of the magnetic element 3 and the first molded portion 61 formed in close contact with the magnetic pole surface 3Y near the corner 3A. 2 and the 3rd shaping | molding part 63 formed closely_contact | adhered with the 1st shaping | molding part 61 and the 2nd shaping | molding part 62 so that the outer periphery of the right-and-left end part 3B of the magnet element 3 may be covered with the end surface 3Z. The rotor core permanent magnet 2 having the insertion guide portion 60 is formed by integrally molding the first molded portion 61, the second molded portion 62, and the third molded portion 63 into the magnet element 3 with the same synthetic resin material. can get.

FIG. 12 is a plan view showing the rotor 1 in which the rotor core permanent magnet 2 in which the insertion guide portion 60 is thus formed is inserted and embedded in the rotor core 11 of the rotor 1 of the permanent magnet type rotating electric machine. As in the first embodiment, the rotor 1 has a rotor core 11, a slot formed by a plurality of (8 in the figure) through holes in the circumferential direction of the rotor core 11, and a rotor shaft to which the rotor shaft is fixed at the center. Each slot is a through hole of a size that can be inserted between the magnet element 3 of the rotor core permanent magnet 2 and the insertion guide portion 60 without a gap. The rotor core permanent magnet 2 is embedded in each slot, the magnetic poles N and S of the magnetic pole surface 3Y are arranged in the radial direction, the left and right side surfaces 3X are in the circumferential direction, and the magnetic poles N and S are alternately distributed. In this way, a stator, which is a stator (not shown), is inserted into the outer peripheral position of the rotor core 11 through a gap so as to form a magnetic circuit with the magnetic poles N and S, and a stator that is a stator (not shown) is incorporated into the permanent magnet type rotation. An electric machine is obtained. In this case, the end surface 3Z of the magnet element 3 is closed by a rotor shaft bearing base (not shown) fixed to the rotor shaft hole 12, but covers the outer periphery of the left and right end portions 3B of the magnet element 3. Since the third molded portion 63 has a protruding shape, it is necessary to design the shape of the bearing stand in consideration of the protruding shape. Thus, since the insertion guide part 60 covers the outer periphery of the left and right end parts 3B of the magnet element 3, the first molding part 61, the second molding part 62, and the third molding part 63 are not separated, The magnet element 3 can be easily inserted without being damaged.

(Embodiment 3)
FIGS. 13 and 14 show different embodiments of the permanent magnet 2 for the rotor core of the permanent magnet type rotating electric machine. The insertion guide portion 60 of the permanent magnet 2 for the rotor core is the same as that of the second embodiment, and the left and right end portions 31B of the magnet element 31 are shown. Although it is the structure which covers the outer periphery of this, the structure of the insertion guide part 6 of Embodiment 1 may be sufficient.

In FIG. 13, the magnetic pole surface 31 </ b> Y of the magnet element 31 has an arc shape, and the outer periphery of the left and right end portions 31 </ b> B is covered with the insertion guide portion 60. The permanent magnet 2 for rotor cores accommodated in the guide part 60 is obtained. The rotor core permanent magnet 2 can be easily inserted into the slot of the rotor core 11 of the permanent magnet type rotating electric machine without damaging the magnet element 31.

In FIG. 14, a plurality of rotor core permanent magnets 2 having an arc-shaped magnetic pole surface 31Y, magnetic poles N and S of the magnetic pole surface 31Y are arranged in the radial direction, and left and right side surfaces 31X are in the circumferential direction, and the magnetic poles N and S Are arranged so as to be alternately distributed, the arc-shaped magnetic pole surface 31Y reduces the iron loss of the rotor core 11, and can be used for a compressor driving motor of a refrigerator or an air conditioner.

(Embodiment 4)
FIG. 15 shows different embodiments of the insertion guide portion in the permanent magnet for the rotor core of the permanent magnet type rotating electric machine.

In FIG. 15, the insertion guide portion 6 of the rotor core permanent magnet 2 has the shape of the insertion guide portion 6 shown in the first embodiment, and a space portion 61 </ b> B is formed in the first molding portion 61 to be elastic to the insertion guide portion 6. Has an effect. By providing an elastic action in this way, even if the rotor rotates at high speed and a centrifugal force acts on the permanent magnet 2, the insertion guide portion 6 can absorb the centrifugal force. As the shape of the space portion 61 </ b> B, a hole penetrating in the vertical direction is illustrated, but a hollow portion formed inside so as not to be exposed to the outside of the insertion guide portion 6 may be used. In addition, as a raw material of the 1st shaping | molding part 61, thermoplastic resins, such as polyphenylene sulfide resin, can be illustrated. Moreover, although not shown in the space 61B, a spring material may be provided.

(Embodiment 5)
FIG. 16 shows different embodiments of the insertion guide portion in the permanent magnet for the rotor core of the permanent magnet type rotating electric machine.

In FIG. 16, the insertion guide portion 6 of the rotor core permanent magnet 2 has the shape of the insertion guide portion 6 shown in the first embodiment, and an elastic coating layer portion 61 </ b> C is formed on the outer peripheral surface of the first molding portion 61 of the insertion guide portion 6. Is formed so that the insertion guide 6 can absorb the centrifugal force with the same elastic action as in the fourth embodiment. In this case, examples of the material of the first molding portion 61C include rubber materials such as silicon rubber and fluorine rubber, and examples of the forming method include application.

(Embodiment 6)
FIG. 17 shows different embodiments of the insertion guide portion in the permanent magnet for the rotor core of the permanent magnet type rotating electric machine.

In FIG. 17, the insertion guide portion 6 of the rotor core permanent magnet 2 has the shape of the insertion guide portion 6 shown in the first embodiment, and an elastic rib 61 </ b> D is formed on the outer periphery of the first molding portion 61 of the insertion guide portion 6. It is formed by molding and has the same elastic action as that of the fourth embodiment so that the insertion guide portion 6 can absorb the centrifugal force. In this case, examples of the material of the first molding portion 61 include thermoplastic resins such as polyphenylene sulfide resin, and rubbers such as silicon rubber and fluorine rubber.

In addition, in order to give the insertion guide part 6 in the permanent magnet for rotor cores of a permanent magnet type rotating electrical machine an elastic action, the material of the first molding part 61 is not made into the shape as shown in the fourth to sixth embodiments. It is good also as rubbers, such as silicon rubber and fluorine rubber. Further, not only the material of the first molding part 61 but also the material of the second molding part 62 may be integrally molded as rubber such as silicon rubber or fluorine rubber.

Also, the insertion guide portion 60 may absorb the centrifugal force by providing an elastic action like the insertion guide portion 6.

The permanent magnet for the rotor core of the permanent magnet type rotating electric machine according to the present invention is also used for the rotor core of the embedded magnet type electric motor, but may be used in the same structure for the core of the permanent magnet generator.

1 Rotor 11 Rotor Core 2 Permanent Magnet for Rotor Core (Permanent Magnet)
3, 31 Magnet element 4 Protective layer 5 Surface treatment layers 6, 60 Insertion guide part 61 First molding part 62 Second molding part 63 Third molding part

Claims (5)

In a plate-like permanent magnet inserted into a slot of a rotor core of a permanent magnet type rotating electrical machine, a plate-like magnet element having a magnetic pole surface, side surfaces on the left and right sides of the magnetic pole surface, and upper and lower end surfaces, and the magnet element A first molded part formed on the corner and side surfaces of the first molded part, and a second molded part formed in close contact with the first molded part at a portion of the magnetic pole surface in the vicinity of the corner part, The first molded part and the second molded part are integrally molded into the magnet element with the same synthetic resin material so that the first molded part and the second molded part become insertion guide parts. A permanent magnet for a rotor core of a permanent magnet type rotating electrical machine. A thin film-like protective layer made of an antioxidant that prevents corrosion of the magnet element is previously formed on the surface of the magnet element, and the first molded portion and the second molded portion serve as the protective layer. The permanent magnet for a rotor core of a permanent magnet type rotating electric machine according to claim 1, wherein the permanent magnet is integrally formed with the magnet element. The permanent magnet for a rotor core of a permanent magnet type rotating electric machine according to claim 2, wherein the protective layer, the first molding part and the second molding part are made of the same synthetic resin material. A third molded portion that is formed on the end face and in close contact with the first molded portion and the second molded portion at the corner portion of the magnet element is integrally molded with the magnet element using the same synthetic resin material. The permanent magnet for a rotor core of a permanent magnet type rotating electrical machine according to any one of claims 1 to 3, wherein the permanent magnet is an insertion guide portion. The permanent magnet for a rotor core of a permanent magnet type rotating electric machine according to any one of claims 1 to 4, wherein the first molded part is made of an elastic material.

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