JPH10174325A - Permanent-magnet rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a permanent-magnet rotary electric machine in which magnetic poles comprising permanent magnets do not form rust and which has high weatherability by protecting both side faces and outer peripheries of the magnetic poles from the outside air with side-face protective members and outer-periphery protective members, respectively. SOLUTION: Magnetic poles 14 comprises a rare-earth permanent magnet made of neodymium, samarium-cobalt, etc., and an inter-pole spacer 15 put between each of magnetic poles 14 is fixed to a spider 12 in a state where the inclined surface 15a of the spacer 15 is depressed against the tilted sections 14a of the magnetic poles 14 by screwing fixing bolts 16 in the tapped holes 13 of the spider 12. Both sides faces of each magnetic pole 14 in the axial direction are protected from the outside air with a thick side-face protective member 17, and the outer periphery of the pole 14 is protected from the outside air with an outer-periphery protective member 18 composed of a weatherproofing sheet 18a of a high polymer film, etc., which has a high weatherproofing property even when the film is thin and in fixed to the outer periphery of the pole 14 with a seal tape 18b. There before, the pole 14 has a high weatherproofing property and does not form rust, because the pole 14 is sufficiently protected from the outside air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet type rotating electric machine in which a permanent magnet such as a rare earth element is used as a magnetic pole of a rotor, and more particularly to an improvement in weather resistance such as rust prevention of a permanent magnet.

[0002]

2. Description of the Related Art FIG. 7 is a front view showing the structure of a conventional permanent magnet type rotating electric machine disclosed in Japanese Patent Application No. 07-162272 filed by the same applicant. In the figure, 1 is a stator core wound with a stator winding (not shown), 2 is a spider made of a magnetic material and arranged at the center of the stator core 1 and supported for free rotation, 3 is a spider The screw holes 4 provided on the outer peripheral portion of 2 are made of rare earth permanent magnets such as neodymium or samarium cobalt, and have inclined portions 4a at both ends in the circumferential direction, and are fixed at intervals along the outer periphery of the spider 2. A plurality of magnetic poles 5 arranged through a gap with the iron core 1 are made of non-magnetic material and have inclined surfaces 5a at both ends in contact with the inclined portions 4a. A plurality of pole spacers arranged between the magnetic poles 4 are arranged. , 6 are mounting bolts screwed into the screw holes 3 of the spider 2.

Next, the operation will be described. Mounting bolt 6
Is screwed into the screw hole 3 of the spider 2 so that the spacer 5 between the magnetic poles 4 is inclined.
a is pressed against the inclined portion 4 a of the magnetic pole 4 to fix the magnetic pole 4 to the spider 2.

[0004]

The conventional permanent magnet type rotating electric machine is configured as described above, and the surface of the magnetic pole 4 is exposed to the outside air. Therefore, the magnetic pole 4 made of rare earth or the like is relatively weak to rust and the like. However, there has been a problem that the rust progresses due to dew condensation on the surface due to long-term use, and the structure is remarkably deteriorated, and the structure is likely to collapse, magnet demagnetization is generated, and the basic performance of the rotating electric machine is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a permanent magnet type rotating electric machine which does not generate rust on a magnetic pole made of a permanent magnet and has excellent weather resistance. .

[0006]

According to a first aspect of the present invention, there is provided a permanent magnet type rotating electric machine, comprising: a stator core on which a stator winding is wound; A plurality of magnetic poles, which are made of permanent magnets, are made of permanent magnets, are spaced from each other along the outer periphery of the spider through the stator core and the air gap, and are made of a non-magnetic material and are fixed to the spider and are attached to the magnetic poles. A spacer between the poles, which is alternately arranged to fix the magnetic pole to the spider by abutting the side surface of the magnetic pole at the inclined portion of the side, and a non-magnetic material formed in a ring shape on the outer periphery of the spider along both sides of the magnetic pole. A side protection member comprising: a weather-resistant sheet such as a polymer film disposed along the outer circumference of the magnetic pole; and an outer circumference protection portion comprising a seal tape wound around the circumference of the weather resistance sheet and the side protection member. Which is constituted by the.

Further, in the permanent magnet type rotating electric machine according to claim 2 of the present invention, in claim 1, the side surface protection member is formed in a ring shape by winding a seal tape.

According to a third aspect of the present invention, there is provided a permanent magnet type rotating electric machine according to the second aspect, wherein the spider is provided with a ring-shaped projection so as to extend along both outer surfaces of the side surface protection member. .

According to a fourth aspect of the present invention, in the permanent magnet type rotating electric machine according to the first aspect, the side surface protection member is formed of a nonmagnetic metal in a ring shape.

According to a fifth aspect of the present invention, there is provided a permanent magnet type rotating electric machine comprising: a stator core on which a stator winding is wound; and a spider disposed at the center of the stator core and supported for free rotation. And a plurality of magnetic poles consisting of permanent magnets and spaced apart from each other along the outer periphery of the spider via the stator core and air gap, and a non-magnetic material fixed to the spider and alternately arranged with the magnetic poles A pole spacer that fixes the magnetic pole to the spider by abutting the side surface of the magnetic pole at the inclined portion of the side surface, and a side protection portion that protrudes in a ring shape from the outer periphery of the spider at a position in contact with both side portions of the magnetic pole and blocks both sides, It consists of a weather-resistant sheet such as a polymer film arranged along the outer circumference of the magnetic pole, and an outer-periphery protection member made of a seal tape wound around the outer circumference of the side-surface protection portion with the weather-resistant sheet. That.

According to a sixth aspect of the present invention, there is provided a permanent magnet type rotating electric machine according to any one of the first to fifth aspects, wherein a varnish film is formed on the surface of the magnetic pole.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 1 of the present invention, and FIG. 2 is a longitudinal sectional view taken along line II-II in FIG. In the drawing, reference numeral 12 denotes a fixed iron core (not shown) made of a magnetic material
A spider 13 which is arranged at the center of the spider and is rotatably supported; 13 is a screw hole provided on the outer periphery of the spider 12;
Reference numeral 14 denotes a permanent magnet made of a rare earth element such as neodymium or samarium cobalt and has inclined portions 14a at both ends in the circumferential direction. A plurality of permanent magnets are arranged at intervals along the outer periphery of the spider 12 via a stator core and a gap. The magnetic poles 15 are made of a non-magnetic material, and the inclined surfaces 15 contacting the inclined portions 14a at both ends.
a, a plurality of inter-electrode spacers which are disposed between the magnetic poles 14, 16 are mounting bolts which are screwed into the screw holes 13 of the spider 12, and 17 are a predetermined distance from each of both axial side surfaces of the magnetic pole 14. A molding jig (not shown) is provided, and a thermosetting sealing tape such as a glass prepreg tape is wound around the jig and stacked and formed into a ring shape. A weather-resistant sheet 18a such as a polymer film arranged along the side, and a thermosetting sealing tape such as a glass prepreg tape wound around the weather-resistant sheet 18a inside and in contact with the outer periphery of the side surface protection member 17 18b.

Next, the operation will be described. As in the conventional configuration, the pole spacers 15 are screwed into the screw holes 13 of the spider 12 so that the inter-electrode spacer 15 disposed between the magnetic poles 14 causes the inclined surface 15 a to be inclined. The polymer film is fixed to the spider 12 by being pressed against the portion 14a, and the side surfaces in the axial direction are prevented from entering the outside air by the side surface protection members 17 having a thickness, and the outer peripheral side is thin but has excellent weather resistance even if it is thin. Since the outside air is prevented from entering by the outer peripheral protection member 18 to which the weather-resistant sheet 18a is fixed with the sealing tape 18b, the magnetic pole 14 is sufficiently protected against the outside air and has excellent weather resistance.

Embodiment 2 FIG. FIG. 3 is a longitudinal sectional view showing the configuration of the rotor of the permanent magnet type rotating electric machine according to Embodiment 2 of the present invention. In the first embodiment, the side surface protection member 17 formed by molding and fixing a thermosetting sealing tape in a ring shape is used to protect both side surfaces of the magnetic pole 14 in the axial direction, but in the second embodiment, it is shown in FIG. As described above, the side surface protection members 19 formed in a ring shape in contact with both axial side surfaces of the magnetic pole 14 and made of a non-magnetic metal such as a stainless material were used. According to this configuration, molding of the side surface protection portion can be facilitated.

Embodiment 3 FIG. 4 is a longitudinal sectional view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 3 of the present invention. In the first embodiment, a jig (not shown) is required to form the side surface protection member 17.
In the third embodiment, as shown in FIG. 4, a ring-shaped projection 2 is provided at a position in contact with each side surface of the side surface protection member 17.
A spider 20 provided with a side protection member 17 is formed by winding a thermosetting sealing tape between the side surfaces of the magnetic poles 14 and using the protrusions 20a as guides to form a ring shape. According to this configuration, the productivity is improved without requiring a jig for molding the side surface protection member 17.

Embodiment 4 FIG. 5 is a longitudinal sectional view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 4 of the present invention. In the first to third embodiments, the magnetic pole 14 is used.
Are closed by the non-magnetic material of the side surface protection member 17 or 19, but in the fourth embodiment, as shown in FIG. Side protection part 21a protruding in the shape of
The outer periphery protection member 18 is provided in contact with the side surface protection portion 21a. According to this configuration, the exposed surface of the magnetic pole 14 is protected by the side surface protection portion 21a and the outer circumference protection member 18, so that outside air can be prevented from entering. Although the side surface protection portions 21a form magnetic paths on both side surfaces in the axial direction of the magnetic pole 14, the side surface protection portions 21a are formed to be thin and have relatively little influence.

Embodiment 5 FIG. 6 is a longitudinal sectional view showing the configuration of the rotor of the permanent magnet type rotating electric machine according to Embodiment 5 of the present invention. In the first to fourth embodiments, the magnetic pole 14 is used.
In the fifth embodiment, the magnetic pole 14 is fixed to the spider 12, 20, or 21, and then, for example, an epoxy-based varnish is applied to the magnetic pole 14 by dipping or the like. After the varnish coating 22 is formed as shown in FIG. 3, the side surface protection member 17 and the outer periphery protection member 18 are applied, and the weather resistance such as rust prevention of the magnetic pole 14 can be further improved.

[0018]

As described above, according to the first aspect of the present invention, the stator core on which the stator winding is wound, and the spider disposed at the center of the stator core and supported for free rotation are provided. A plurality of magnetic poles, which are made of permanent magnets and are arranged at intervals from each other along the outer periphery of the spider through the stator core and the air gap, and are made of a non-magnetic material, are fixed to the spider, and are alternately arranged with the magnetic poles. A pole spacer that fixes the magnetic pole to the spider by abutting the side of the magnetic pole at the inclined portion of the side surface, and a side protection member made of a non-magnetic material formed in a ring shape on the outer periphery of the spider along both sides of the magnetic pole. And, since it was configured with a weather-resistant sheet such as a polymer film disposed along the outer periphery of the magnetic pole and an outer-peripheral protection member formed of a seal tape wound around the outer periphery of the weather-resistant sheet and the side surface protection member, Pole exposed surface the effect of ambient air and a fully shielded permanent magnet type rotary electric machine rust excellent weather resistance does not occur is obtained in the.

According to a second aspect of the present invention, in the first aspect, the side surface protection member is formed in a ring shape by winding a seal tape, so that the exposed surface of the magnetic pole is completely shielded from the outside air and rust is prevented. There is an effect that a permanent magnet type rotating electric machine which does not generate and has excellent weather resistance can be obtained.

According to a third aspect of the present invention, in the second aspect, the spider has a ring-shaped protruding portion extending along both outer surfaces of the side surface protection member, so that a jig for molding the side surface protection member is provided. Thus, there is an effect that a permanent magnet type rotating electric machine having good productivity can be obtained without requiring the above.

According to a fourth aspect of the present invention, in the first aspect, since the side surface protection member is formed of a nonmagnetic metal in a ring shape, the permanent magnet type which facilitates the formation of the side surface protection member is provided. There is an effect that a rotating electric machine can be obtained.

According to a fifth aspect of the present invention, there is provided a stator core on which a stator winding is wound, a spider disposed at the center of the stator core and supported to rotate freely, and a permanent magnet. A plurality of magnetic poles arranged at intervals from each other along the outer periphery of the spider via a gap between the stator core and the air gap, and a non-magnetic material fixed to the spider and arranged alternately with the magnetic poles, and the inclined portions on the side surfaces. A spacer between the poles that fixes the magnetic poles to the spider by contacting with the side surfaces of the magnetic poles, a side protection part that protrudes in a ring shape from the outer periphery of the spider at positions that contact both sides of the magnetic poles, and blocks both sides, and along the outer circumference of the magnetic poles Since it is composed of a weather-resistant sheet such as a polymer film and a weather-resistant sheet and an outer peripheral protection member made of a sealing tape wound around the outer periphery of the side surface protection portion,
With a simple configuration, the exposed surface of the magnetic pole is shielded from the outside air, so that there is an effect that a permanent magnet type rotating electric machine which does not generate rust and has excellent weather resistance can be obtained.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a varnish coating is formed on the surface of the magnetic pole, so that the protection of the surface of the magnetic pole is further effective, and weather resistance such as rust prevention is provided. This has the effect of further improving the performance.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view taken along line II-II in FIG.

FIG. 3 is a longitudinal sectional view illustrating a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 2 of the present invention;

FIG. 4 is a longitudinal sectional view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 3 of the present invention.

FIG. 5 is a longitudinal sectional view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 4 of the present invention.

FIG. 6 is a longitudinal sectional view showing a configuration of a rotor of a permanent magnet type rotating electric machine according to Embodiment 5 of the present invention.

FIG. 7 is a front view showing a configuration of a conventional permanent magnet type rotating electric machine.

[Explanation of symbols]

12 spiders, 14 magnetic poles, 15 spacers between poles, 1
7 side protection member, 18 outer circumference protection member, 18a weatherproof sheet, 18b thermosetting sealing tape, 19 side protection member, 20 spider, 20a protrusion, 21 spider, 21a side protection portion, 22 varnish coating.

Claims (6)

[Claims] 1. A stator core on which a stator winding is wound, a spider arranged at the center of the stator core and rotatably supported, and a permanent magnet, the stator core being interposed between the stator core and an air gap. A plurality of magnetic poles arranged at intervals from each other along the outer periphery of the spider, and a side surface of the magnetic pole at an inclined portion of a side surface which is made of a non-magnetic material and is fixed to the spider and is alternately arranged with the magnetic pole respectively. An inter-electrode spacer for fixing the magnetic pole to the spider by abutting, a side surface protection member made of a non-magnetic material formed in a ring shape on both sides of the magnetic pole on the outer periphery of the spider,
A weather-resistant sheet such as a polymer film disposed along the outer periphery of the magnetic pole, and an outer peripheral protection member made of a sealing tape wound around the outer periphery of the weather-resistant sheet and the side surface protection member. Permanent magnet type rotating electric machine. 2. The side protection member is formed in a ring shape by winding a seal tape.
2. A permanent magnet type rotating electric machine according to claim 1. 3. The permanent magnet type rotating electric machine according to claim 2, wherein the spider has a ring-shaped protrusion along both outer surfaces of the side surface protection member. 4. The permanent magnet type rotating electric machine according to claim 1, wherein the side surface protection member is formed of a nonmagnetic metal in a ring shape. 5. A stator core on which a stator winding is wound, a spider disposed at the center of the stator core and supported in a freely rotatable manner, and a permanent magnet comprising the stator core and a gap therebetween. A plurality of magnetic poles arranged at intervals from each other along the outer periphery of the spider, and a side surface of the magnetic pole at an inclined portion of a side surface which is made of a non-magnetic material and is fixed to the spider and is alternately arranged with the magnetic pole respectively. An inter-electrode spacer for fixing the magnetic pole to the spider by abutting, a side-surface protecting portion projecting in a ring shape from the outer periphery of the spider at a position in contact with both side portions of the magnetic pole and closing the both side portions, and an outer periphery of the magnetic pole; A weather-resistant sheet such as a polymer film disposed along the outer peripheral protection member made of a sealing tape wound around the outer periphery of the weather-resistant sheet and the side surface protection portion. Permanent magnet type rotating electric machine. 6. The permanent magnet type rotating electric machine according to claim 1, wherein a varnish coating is formed on a surface of the magnetic pole.