JP2008136320A - Salient-pole rotor of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and highly efficient rotary electric machine whose weight is reduced. <P>SOLUTION: A salient-pole rotor of the rotary electric machine includes a rotor spider having a dovetail groove extending in an axial direction on an outer periphery and a magnetic pole having a dovetail projection engaged with the dovetail groove. The magnetic pole having the dovetail projection is engaged with the dovetail groove, and a cotter is press-fitted to wall faces of them. Since a magnetic object is held in a gap formed between the dovetail groove and the magnetic pole of the engaged dovetail projection, output increases by increase of magnetic flux density between the magnetic pole and a stator. Thus, the compact and highly efficient rotary electric machine whose weight is reduced can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a salient pole type rotor of a rotating electrical machine, and more particularly to a salient pole type rotor of a rotating electrical machine having improved coupling between a salient pole magnetic pole and a rotor spider.

A salient pole rotor of a rotating electrical machine that has been generally employed will be described with reference to FIGS.
As shown in FIG. 6, a salient pole rotor of a conventional rotating electrical machine is formed by arranging a plurality of magnetic poles 2 in parallel on the outer periphery of a rotor spider 1 at intervals in the circumferential direction. The coupling between the rotor spider 1 and the magnetic pole 2 is performed by fitting a dovetail groove 3 provided on the outer periphery of the rotor spider 1 and a dovetail convex part 4 provided on the root of the magnetic pole 2, that is, on the rotation center side of the magnetic pole 2. The fastening is performed by a cotter 5 press-fitted between the wall surfaces of the dovetail groove 3 and the dovetail convex portion 4. The rotor spider 1, the magnetic pole 2 and the cotter 5 are made of a ferromagnetic material, and the relative permeability thereof is about 2000 to 7000.

FIG. 7 is a block diagram of the entire salient pole magnetic part. As shown in FIG. 7, one end of the magnetic pole 2 around which the coil 6 is wound is opposed to the stator 7 with a gap. As shown in FIG. 6, the formed dovetail convex portion 4 is engaged with a dovetail groove 3 provided on the outer periphery of the rotor spider 1 and fastened by a cotter 5. Reference numeral 9 denotes a gap formed between the dovetail protrusion 4 on the magnetic pole 2 side and the dovetail groove 3 and cotter 5 of the rotor spider 1. When a current is passed through the coil 6, a magnetic flux 8 is generated between the magnetic pole 2 and the stator 7, and a magnetic flux 10 is also generated at a fitting portion between the dovetail convex portion 4 and the rotor spider 1. Examples of documents related to this type of salient pole rotor include Patent Document 1 and Patent Document 2.
Japanese Examined Patent Publication No. 4-52699 JP 2001-128398 A

  However, in the above-described conventional salient pole rotor, the gap 9 formed between the dovetail convex part 4 on the magnetic pole 2 side and the dovetail groove 3 and cotter 5 of the rotor spider 1 is a gap that is necessarily formed due to the structure. It is. Normally, air having a relative permeability of 1 exists in the gap 9, and the magnetic flux 10 is formed so as to avoid the gap 9 when an electric current is passed through the coil 6. Therefore, the magnetic flux density is unbalanced and the density is high. The portion is saturated, and the magnetic flux density of the magnetic flux 8 between the most important magnetic pole 2 and the stator 7 may be lowered. Therefore, voltage shortage and output shortage occur, and measures such as increasing the iron core length are necessary to compensate for it. This has been a factor in reducing the efficiency of rotating electrical machines due to an increase in weight and an increase in mechanical loss.

  This invention is made | formed in view of the said situation, The subject is providing the highly efficient rotary electric machine which was compact and reduced the weight.

  In order to achieve the above object, claim 1 of the present invention provides a rotor spider having a dovetail groove extending in the axial direction on the outer periphery, a magnetic pole having a dovetail protrusion fitted to the dovetail groove, and a dovetail groove. In a salient pole rotor of a rotating electrical machine, in which a magnetic pole having the dovetail convex portion is fitted and a cotter is press-fitted to the wall surfaces of both, the gap between the dovetail groove and the magnetic pole of the dovetail convex portion A magnetic material is held in a gap formed in the substrate.

  According to a second aspect of the present invention, in the salient pole rotor of the rotating electric machine according to the first aspect, the gap between the bottom portion of the dovetail groove and the magnetic pole of the dovetail convex portion is tapered.

  According to a third aspect of the present invention, in the salient pole rotor of the rotating electric machine according to the first aspect, a small axial groove is provided in the magnetic pole of the dovetail groove bottom or the dovetail protrusion or both. .

  According to a fourth aspect of the present invention, in the salient pole rotor of the rotating electrical machine according to any one of the first to third aspects, the dovetail groove is formed between the dovetail groove and the magnetic pole of the dovetail convex portion. The magnetic body held in the gap is a mixed material of ferromagnetic metal powder and curable resin.

  According to the salient pole rotor of the rotating electrical machine of the present invention, the magnetic body is held in the gap formed between the dovetail groove and the magnetic pole of the dovetail convex portion fitted, so that the gap between the magnetic pole and the stator is Since the output increases as the magnetic flux density increases, a compact and highly efficient rotating electrical machine with reduced weight can be provided.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a detailed view of a dovetail fitting portion of a salient pole rotor of a rotating electrical machine according to the first embodiment of the present invention, and FIG. 2 is a configuration of the entire salient pole magnetic pole portion of the salient pole rotor of FIG. The same components as those of the salient pole rotor of the conventional rotating electric machine of FIGS. 6 and 7 already described are denoted by the same reference numerals, and redundant description thereof is omitted.

  As shown in FIGS. 1 and 2, this embodiment is different from the conventional salient-pole rotor of a rotating electric machine in that the magnetic pole 2 side dovetail convex portion 4, the dovetail groove 3 of the rotor spider 1, and the cotter 5. That is, the magnetic body 11 is held in a gap that is formed between them. The magnetic body 11 is magnetized in a magnetic field such as a magnetic fluid or a ferromagnetic powder.

Next, the operation of this embodiment will be described.
Usually, the rotor spider 1, the magnetic pole 2 and the cotter 5 are made of a ferromagnetic material, and when a current is passed through the coil 6 by holding the magnetic material 11 in a gap formed structurally between them. As shown in FIG. 2, the magnetic flux 12 is effectively formed, the imbalance of the magnetic flux density is eliminated, the high density portion is reduced, and the amount of magnetic flux saturation is reduced. The magnetic flux density of the magnetic flux 13 increases. The output increases as the magnetic flux density increases. If the output is constant, the length of the iron core can be shortened, leading to a reduction in weight and mechanical loss, and the efficiency of the rotating electrical machine can be increased.

  Therefore, according to the present embodiment, it is possible to provide a highly efficient rotating electrical machine that is compact and has reduced weight.

  FIG. 3 is a configuration diagram of a salient pole rotor of a rotating electrical machine according to a second embodiment of the present invention, where FIG. 3 (a) is a detailed view of a dovetail fitting portion, and FIG. 3 (b) is the same drawing. It is AA sectional drawing of (a).

  As shown in FIG. 3, this embodiment is different from the conventional salient-pole rotor of the rotating electric machine in that a dovetail groove 3 with a tapered rotor spider 14 is used, and the magnetic pole 2 side dovetail convex portion 4 The difference is that the gap at the bottom of the dovetail groove 3 of the rotor spider 14 is tapered, and the rest is configured in the same manner as in the first embodiment of FIG.

Next, the operation of this embodiment will be described.
In the present embodiment, a taper as shown in FIG. 3B is provided in a gap between the magnetic pole 2 side dovetail protrusion 4 and the bottom of the dovetail groove 3 of the rotor spider 14, and the magnetic body 11 is held in this gap. ing. Further, since the gap is tapered, it is easy to fill the magnetic body 11 in the gap.

  And when an electric current is sent through a coil, there exists the same effect | action as 1st Embodiment. That is, as shown in FIG. 2, the magnetic flux 12 is effectively formed, the imbalance of the magnetic flux density is eliminated, the high density portion is reduced, and the amount of magnetic flux saturation is reduced. The magnetic flux density of the magnetic flux 13 increases. The output increases as the magnetic flux density increases. If the output is constant, the length of the iron core can be shortened, leading to a reduction in weight and a reduction in mechanical loss.

  Therefore, the present embodiment can provide a highly efficient rotating electrical machine that is compact and has a reduced weight, as in the first embodiment.

  4A and 4B are configuration diagrams of a salient pole rotor of a rotating electrical machine according to a third embodiment of the present invention, in which FIG. 4A is a detailed view of a dovetail fitting portion, and FIG. It is BB sectional drawing of (a).

  As shown in FIG. 4, this embodiment differs from the first embodiment of FIG. 1 in that the dovetail groove has a small axial grooved rotor spider 15 and a small axial grooved dovetail convex. The point 16 is adopted, and the bottom of the dovetail groove 3 and the dovetail convex part 16 are provided with small axial grooves. Other configurations are the same as those of the first embodiment shown in FIG. The axial groove may be only the bottom part of the dovetail groove 3 or only the dovetail convex part 4.

Next, the operation of this embodiment will be described.
In the present embodiment, a small axial groove is provided in the bottom of the dovetail groove 3 and the dovetail protrusion 16 to form a gap. The gap or the like can be easily filled with the liquid or powdered magnetic body 11 using a nozzle 17 as shown in FIG. In this way, the magnetic body 11 is held in the gap. And when an electric current is sent through a coil, there exists the same effect | action as 1st Embodiment.

  Therefore, the present embodiment can provide a highly efficient rotating electrical machine that is compact and has a reduced weight, as in the first embodiment.

  FIG. 5 is a configuration diagram of a dovetail fitting portion of a salient pole rotor of a rotating electrical machine according to a fourth embodiment of the present invention.

  As shown in FIG. 5, this embodiment is different from the first embodiment of FIG. 1 in that the dovetail convex part 4 on the magnetic pole 2 side and the dovetail groove 3 and cotter 5 of the rotor spider 1 are structurally different. This is that the mixed material 18 of the ferromagnetic metal powder and the curable resin is held in the formed gap, and the other configuration is the same as that of the first embodiment of FIG.

Next, the operation of this embodiment will be described.
In this embodiment, since the magnetic body 11 of the first embodiment is a magnetic body 18 of a mixed material of ferromagnetic metal powder and curable resin, the same action as the magnetic body 11 of the first embodiment is achieved. In this embodiment, since the curable resin is used, when filling the gap, the gap can be filled in a liquid state. And since it hardens | cures after fixed time, there exists an advantage that the special mechanism and jig | tool for a holding | maintenance are not required.

  Therefore, the present embodiment can provide a highly efficient rotating electrical machine that is compact and has a reduced weight, as in the first embodiment.

The block diagram of the dovetail fitting part of the salient pole type rotor of the rotary electric machine of the 1st Embodiment of this invention. The block diagram of the whole salient pole magnetic pole part of FIG. It is a block diagram of the salient pole type rotor of the rotary electric machine of the 2nd Embodiment of this invention, The figure (a) is a detailed drawing of a dovetail fitting part, The figure (b) is A of the figure (a). -A sectional drawing. It is a block diagram of the salient pole type rotor of the rotary electric machine of the 3rd Embodiment of this invention, The figure (a) is a detailed drawing of a dovetail fitting part, The figure (b) is B of the figure (a). -B sectional drawing. The block diagram of the dovetail fitting part of the salient pole type rotor of the rotary electric machine of the 4th Embodiment of this invention. The block diagram of the dovetail fitting part of the conventional salient pole rotor. The block diagram of the whole salient pole magnetic pole part of the conventional salient pole type rotor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotor spider, 2 ... Magnetic pole, 3 ... Dovetail groove, 4 ... Dovetail convex part, 5 ... Cotta, 6 ... Coil, 7 ... Stator, 8, 10, 12, 13 ... Magnetic flux, 9 ... Gap, 11 ... Magnetic body , 14 ... Rotor spider with tapered dovetail groove, 15 ... Rotor spider with dovetail groove with small axial groove, 16 ... Dovetail convex part with small axial groove, 17 ... Nozzle, 18 ... Ferromagnetic material Mixed material of metal powder and curable resin.

Claims (4)

  A rotor spider having a dovetail groove extending in the axial direction on the outer periphery, a magnetic pole having a dovetail convex part fitted in the dovetail groove, and a magnetic pole having the dovetail convex part in the dovetail groove, In a salient pole rotor of a rotating electrical machine in which a cotter is press-fitted into a wall surface, a magnetic material is held in a gap formed between the dovetail groove and the magnetic pole of the dovetail convex portion. A salient pole rotor for a rotating electrical machine.   2. The salient pole rotor for a rotating electrical machine according to claim 1, wherein a gap between the bottom portion of the dovetail groove and the magnetic pole of the dovetail convex portion is tapered.   2. The salient pole rotor for a rotating electrical machine according to claim 1, wherein a small axial groove is provided in the magnetic pole of the dovetail groove bottom and / or the dovetail convex portion, or both. .   The salient pole rotor of the rotating electrical machine according to any one of claims 1 to 3, wherein the salient pole rotor is held in a gap formed between the dovetail groove and the magnetic pole of the dovetail convex portion. A salient pole rotor for a rotating electrical machine, wherein the magnetic material is a mixed material of a ferromagnetic metal powder and a curable resin.

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