JP3420906B2 - Permanent magnet type rotating electric machine - Google Patents

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 having permanent magnets of rare earth or the like as magnetic poles of a rotor, and more particularly to improvement of weather resistance such as rust prevention of permanent magnets.

[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 shown in Japanese Patent Application No. 07-162272 proposed by the same applicant. In the figure, 1 is a stator core around which a stator winding (not shown) is wound, 2 is a spider which is made of a magnetic material and is arranged at the center of the stator core 1 and is rotatably supported, and 3 is a spider. Screw holes 4 provided in the outer peripheral portion of 2 are permanent magnets of rare earth 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. The child iron core 1 and a plurality of magnetic poles 5 which are arranged via a gap are made of a non-magnetic material, and have a plurality of interpolar spacers which are provided between the magnetic poles 4 and which have inclined surfaces 5a at both ends for contacting the inclined portions 4a. , 6 are mounting bolts screwed into the screw holes 3 of the spider 2.

Next, the operation will be described. Mounting bolt 6
By screwing the screw into the screw hole 3 of the spider 2, the inter-electrode spacer 5 disposed between the magnetic poles 4 is formed into the inclined surface 5.
A is pressed against the inclined portion 4a of the magnetic pole 4 to fix the magnetic pole 4 to the spider 2.

[0004]

Since the conventional permanent magnet type rotary electric machine is constructed as described above and the surface of the magnetic pole 4 is exposed to the outside air, the magnetic pole 4 made of rare earth or the like is relatively weak against rust and the like. However, there has been a problem that rust progresses due to dew condensation on the surface due to long-term use and the structure remarkably deteriorates, causing fear of tissue collapse and demagnetization of magnets and impairing basic performance of the rotating electric machine.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a permanent magnet type rotating electric machine having excellent weather resistance without causing rust on the magnetic poles made of permanent magnets. .

[0006]

According to a first aspect of the present invention, there is provided a permanent magnet type rotating electric machine in which a stator core around which a stator winding is wound and a central portion of the stator core are freely rotatable. The supported spider, a plurality of magnetic poles made of a permanent magnet and spaced from each other along the outer circumference of the spider through a gap with the stator core, and a magnetic pole that is fixed to the spider and made of a non-magnetic material. Interpolar spacers that are alternately arranged and fix the magnetic poles to the spider by contacting the side faces of the magnetic poles at the inclined portions of the side faces, and non-magnetic materials formed on the outer circumference of the spider along the both sides of the magnetic poles in a ring shape, respectively. An outer peripheral protection part formed of a side protection member, a weather resistant sheet such as a polymer film arranged along the outer periphery of the magnetic pole, and a sealing tape wound around the outer periphery of the weather resistant sheet and the side protection member. Which is constituted by the.

According to a second aspect of the present invention, in the permanent magnet type rotary electric machine according to the first aspect, the side surface protecting member is formed in a ring shape by winding a seal tape.

According to a third aspect of the present invention, in the permanent magnet type rotating electric machine according to the second aspect, the spider is provided with ring-shaped protrusions along both outer side 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 protecting member is formed of a non-magnetic metal in a ring shape.

According to a fifth aspect of the present invention, there is provided a permanent magnet type rotating electric machine in which a stator core around which a stator winding is wound and a spider which is arranged at the center of the stator core and is rotatably supported. And a plurality of magnetic poles made of permanent magnets and spaced from each other along the outer circumference of the spider through a gap with the stator core, and a non-magnetic material fixed to the spider and arranged alternately with the magnetic poles. An inter-electrode spacer that fixes the magnetic pole to the spider by contacting the side surface of the magnetic pole at the inclined portion of the side surface, and a side surface protection portion that projects in a ring shape from the outer periphery of the spider at a position contacting both side portions of the magnetic pole and closes both side portions, A weather-resistant sheet such as a polymer film arranged along the outer circumference of the magnetic pole, and an outer-peripheral protection member composed of the weather-resistant sheet and a seal tape wrapped around the outer circumference of the side surface protection portion. That.

According to a sixth aspect of the present invention, in the permanent magnet type rotary electric machine according to any one of the first to fifth aspects, a varnish coating is formed on the magnetic pole surface.

[0012]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a front view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 1 of the present invention, and FIG. 2 is a vertical sectional view taken along line II-II in FIG. In the figure, reference numeral 12 is made of a magnetic material and is a fixed iron core (not shown).
The spider is placed in 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 of rare earth such as neodymium or samarium cobalt, which has inclined portions 14a at both ends in the circumferential direction and is arranged along the outer circumference of the spider 12 so as to be spaced from each other by a plurality of stator cores and air gaps. The magnetic poles 15 are made of a non-magnetic material, and both ends of the inclined surface 15 come into contact with the inclined portions 14a.
A plurality of inter-electrode spacers having a and arranged between the magnetic poles 14, 16 is a mounting bolt that is screwed into the screw hole 13 of the spider 12, and 17 is spaced apart from both axial side surfaces of the magnetic pole 14 by a predetermined distance. A side protection member 18 is formed by arranging a molding jig (not shown) and winding a thermosetting seal tape such as a glass prepreg tape into this space and stacking and fixing the ring in 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 and in contact with the outer periphery of the side surface protection member 17. 18b is an outer peripheral protection member.

Next, the operation will be described. Similar to the conventional structure, the magnetic poles 14 are screwed with the mounting bolts 16 into the screw holes 13 of the spider 12, so that the interelectrode spacers 15 arranged between the magnetic poles 14 have the inclined surfaces 15a and the magnetic poles 14 inclined. The polymer film is pressed against the portion 14a and fixed to the spider 12, but side surfaces of the axial direction prevent the entry of outside air by the side protection members 17 having a thickness, and the outer peripheral side is thin but has excellent weather resistance. Since the outer peripheral protection member 18 formed by fixing the weather resistant sheet 18a such as the above with the seal tape 18b prevents the outside air from entering, the magnetic pole 14 is sufficiently protected against the outside air and has excellent weather resistance.

Embodiment 2. 3 is a longitudinal sectional view showing the structure of a rotor of a permanent magnet type rotary 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 seal 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 member 19 formed of a non-magnetic metal such as a stainless material is used so as to be in contact with both side surfaces of the magnetic pole 14 in the axial direction. With this configuration, the side surface protection portion can be easily formed.

Embodiment 3. FIG. 4 is a vertical cross-sectional view showing the structure of the rotor of the permanent magnet type rotary electric machine according to Embodiment 3 of the present invention. Although a jig (not shown) is required to mold the side surface protection member 17 in the first embodiment,
In the third embodiment, as shown in FIG. 4, the ring-shaped protrusion 2 is provided at a position in contact with each side surface of the side surface protection member 17.
0a, the thermosetting seal tape is wound between the side surfaces of the magnetic pole 14 by using the protruding portion 20a as a guide, and is piled up in a ring shape to form the side protection member 17. With this configuration, a jig for molding the side surface protection member 17 is not required, and the productivity is improved.

Fourth Embodiment 5 is a longitudinal sectional view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 4 of the present invention. In the first to third embodiments, the magnetic pole 14
The both side surfaces in the axial direction of No. 1 are configured to be covered with the non-magnetic material of the side surface protection member 17 or 19, but in the fourth embodiment, as shown in FIG. Side protection portion 21a formed by projecting in a line shape
The outer peripheral 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 peripheral protection member 18, and the entry of outside air can be prevented. The side surface protection portion 21a forms a magnetic path on both axial side surfaces of the magnetic pole 14, but since it is formed thinly, its influence is relatively small.

Embodiment 5. 6 is a longitudinal sectional view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 5 of the present invention. In the first to fourth embodiments, the magnetic pole 14
Although the protection portion is provided so as to be in contact with the magnetic pole 14, in the fifth embodiment, after fixing the magnetic pole 14 to the spider 12 or 20 or 21, for example, an epoxy varnish is applied to the magnetic pole 14 by dipping or the like, After the varnish coating 22 is formed as shown in (4), the side surface protection member 17 and the outer circumference protection member 18 are constructed, and 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 around which the stator winding is wound, and the spider which is arranged at the center of the stator core and is rotatably supported. , A plurality of magnetic poles made of permanent magnets and spaced from each other along the outer circumference of the spider through a gap with the stator core, and made of a non-magnetic material and fixed to the spider and arranged alternately with the magnetic poles. An inter-electrode 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 surface protection member made of non-magnetic material formed in a ring shape on both sides of the magnetic pole on the outer circumference of the spider. And a weather-resistant sheet such as a polymer film arranged along the outer circumference of the magnetic pole, and the outer-circumferential protection member made of a sealing tape wound around the outer circumference 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 rusted. There is an effect that a permanent magnet type rotary electric machine that does not occur and has excellent weather resistance can be obtained.

According to a third aspect of the present invention, in the second aspect, the spider has ring-shaped protrusions along both outer sides of the side surface protection member, so that the side surface protection member is molded. There is an effect that a permanent magnet type rotating electric machine having good productivity can be obtained without requiring

According to a fourth aspect of the present invention, in the first aspect, the side surface protection member is formed of a non-magnetic metal in a ring shape, so that the side surface protection member can be easily formed into a permanent magnet shape. There is an effect that a rotary electric machine can be obtained.

According to a fifth aspect of the present invention, a stator core around which a stator winding is wound, a spider disposed at the center of the stator core and rotatably supported, and a permanent magnet are used. Narrow stator core and a plurality of magnetic poles spaced from each other along the outer circumference of the spider through a gap, and non-magnetic material fixed to the spider and alternately arranged with the magnetic poles The inter-electrode spacer that fixes the magnetic pole to the spider by abutting on the side surface of the magnetic pole, the side protector that protrudes in a ring shape from the outer circumference of the spider at the position where it contacts both sides of the magnetic pole and closes both sides, Since it is composed of a weather-resistant sheet such as a polymer film and the weather-resistant sheet and the outer peripheral protection member made of a sealing tape wound around the outer periphery of the side surface protection portion,
With the simple structure, the exposed surface of the magnetic pole is shielded from the outside air, rust does not occur, and a permanent magnet type rotating electric machine excellent in weather resistance can be obtained.

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

[Brief description of drawings]

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

2 is a vertical cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a vertical cross-sectional view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 2 of the present invention.

FIG. 4 is a vertical cross-sectional view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 3 of the present invention.

FIG. 5 is a vertical sectional view showing the structure of a rotor of a permanent magnet type rotary electric machine according to Embodiment 4 of the present invention.

FIG. 6 is a vertical cross-sectional view showing the structure of a rotor of a permanent magnet type rotary 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 rotary electric machine.

[Explanation of symbols]

12 spiders, 14 magnetic poles, 15 spacers between poles, 1
7 side surface protection member, 18 outer periphery protection member, 18a weather resistant sheet, 18b thermosetting seal tape, 19 side surface protection member, 20 spider, 20a protruding part, 21 spider, 21a side surface protection part, 22 varnish coating.

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-8-275470 (JP, A) JP-A-8-309581 (JP, A) JP-A-7-194073 (JP, A) JP-A-58- 99252 (JP, A) JP-A-61-207162 (JP, A) Actually open flat 6-36380 (JP, U) Actually open flat 8-223835 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 1/27

Claims (6)

(57) [Claims] 1. A stator core around which a stator winding is wound, a spider disposed at the center of the stator core and rotatably supported, and a permanent magnet. A plurality of magnetic poles spaced apart from each other along the outer circumference of the spider, and fixed to the spider made of a non-magnetic material and alternately arranged with the magnetic poles. An inter-electrode spacer for fixing the magnetic pole to the spider by abutting, and a side surface protecting 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 arranged along the outer periphery of the magnetic pole, and the outer peripheral protection member made of a sealing tape wound around the outer periphery of the side surface protection member and the weather resistant sheet. Permanent magnet type rotating electrical machine. 2. The side surface protecting member is formed in a ring shape by winding a sealing tape.
The permanent magnet type rotating electric machine described in. 3. The permanent magnet type rotating electric machine according to claim 2, wherein the spider is provided with a ring-shaped protrusion so as to extend 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 non-magnetic metal in a ring shape. 5. A stator core around which a stator winding is wound, a spider disposed at the center of the stator core and rotatably supported, and a permanent magnet. A plurality of magnetic poles spaced apart from each other along the outer circumference of the spider, and fixed to the spider made of a non-magnetic material and alternately arranged with the magnetic poles. 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 arranged along with the weather resistant sheet and an outer peripheral protection member made of a seal tape wrapped around the outer periphery of the side surface protection portion. Permanent magnet type rotating electrical machine. 6. The permanent magnet type rotating electric machine according to claim 1, wherein a varnish coating is formed on the magnetic pole surface.