JP5740416B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine having an iron core made of laminated steel sheets.

  An iron core of a rotor of a rotating electrical machine (electric motor or generator) is usually formed by laminating a plurality of steel plates in the axial direction. In this case, in order to cool the iron core, a technique is known in which cooling air is caused to flow through a cooling passage that penetrates the iron core in the axial direction. However, when the flow of the cooling air is only in the axial direction, there are problems such that the temperature in the axial direction becomes non-uniform and a sufficient amount of cooling air cannot be obtained. Therefore, in addition to the cooling channel in the axial direction, there is a technique for forming a channel for flowing cooling air in the radial direction by sandwiching a gap piece (duct piece) for each of a plurality of predetermined steel plates (core packs). Are known.

  However, when a permanent magnet is used for the rotor, when the permanent magnet is inserted into the laminated steel sheet in the axial direction, the core pack is caught and the workability is poor.

  In order to solve such a problem, Patent Document 1 proposes a technique in which two types of grooved steel plates are laminated and a radial flow path is configured by grooves formed in these steel plates.

JP 2009-65827 A

  According to the technique described in Patent Document 1, it is necessary to use two types of steel plates in order to produce an iron core. Therefore, it takes time to arrange and manage the materials, which causes high costs.

  The present invention is for solving such a problem, and can form a cooling air flow path in the radial direction of the iron core without using a spacing piece, and also manufactures a rotor iron core using one type of steel plate. The purpose is to be able to.

In order to solve the above-mentioned problems, a rotating electrical machine according to the present invention includes a rotating shaft, a rotor fixed to the rotating shaft, and the rotor disposed radially outside the rotor via a radial gap. A rotating electrical machine having a stator disposed so as to surround and a frame disposed so as to surround the stator and to which the stator is fixed, wherein the rotor is perpendicular to the axial direction of the rotating shaft. a core formed by laminating axially the steel plate of the plurality of mutually identical shape central opening is formed through which the rotary shaft stretches, a plurality of permanent magnets extend through the interior of the core in the axial direction, Each of the plurality of steel plates includes a central opening through which the rotating shaft is inserted, a plurality of permanent magnet through holes through which the plurality of permanent magnets penetrates, and a central flow hole through which cooling fluid flows in the axial direction. And contact the central circulation hole A plurality of inner grooves that extend toward the outside in the radial direction of the steel plate and are arranged at predetermined center angle intervals, and from the outer periphery of the steel plate to the middle in the radial direction of the steel plate toward the radially inner side A plurality of outer grooves arranged at central angular positions of two inner grooves that are circumferentially adjacent to each other at a central angle interval that is equal to the predetermined central angle, and are adjacent to each other. The two laminated steel plates are arranged with a shift of half the predetermined center angle, and the inner groove of one of the two steel plates and the outer groove of the other steel plate of the two sheets are arranged. It is comprised so that it may communicate in the middle position of the said radial direction.

  According to this invention, the cooling air flow path in the radial direction of the iron core can be formed without using the spacing piece, and the rotor iron core can be manufactured using one type of steel plate, thereby reducing the manufacturing cost.

It is a front view which takes out and shows the steel plate which comprises the iron core of the rotor in 1st Embodiment of the rotary electric machine which concerns on this invention. It is a typical longitudinal section showing the composition of the 1st embodiment of the rotating electrical machine concerning the present invention. It is a typical fragmentary longitudinal cross-sectional view which expands and shows the III part of the rotor core of FIG. It is a front view which takes out and shows the steel plate which comprises the iron core of the rotor in 2nd Embodiment of the rotary electric machine which concerns on this invention. It is a front view which takes out and shows the steel plate which comprises the iron core of the rotor in 3rd Embodiment of the rotary electric machine which concerns on this invention.

  Embodiments of a rotating electrical machine according to the present invention will be described below with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is a front view showing a steel sheet constituting a rotor core in a first embodiment of a rotating electrical machine according to the present invention. FIG. 2 is a schematic longitudinal sectional view showing the configuration of the first embodiment of the rotating electrical machine according to the present invention. FIG. 3 is a schematic partial longitudinal sectional view showing an enlarged III part of the rotor core of FIG.

  As shown in FIG. 2, the first embodiment of the rotating electrical machine according to the present invention includes a rotating shaft 10, a rotor 11, a stator 12, a frame 13, and a fan 14. The stator 12 is fixed to the frame 13 within the frame 13, and is disposed so as to surround the radially outer side of the rotor 11 with a radial gap 40 interposed therebetween. The rotary shaft 10 is rotatably supported by a bearing (not shown) fixed to the frame 13. The rotor 11 and the fan 14 are fixed to the rotary shaft 10 and can rotate together with the rotary shaft 10.

  The rotor 11 includes an iron core 21 configured by laminating a plurality of steel plates 20 in the axial direction, and a plurality of permanent magnets 22 penetrating the iron core 21 in the axial direction.

  The plurality of steel plates 20 have the same shape, and are substantially disk-shaped as shown in FIG. A circular central opening 23 through which the rotary shaft 10 is inserted is formed at the center of the steel plate 20.

  The example shown in FIG. 1 is a steel plate 20 for a rotor core of a six-pole rotating electrical machine, and six central flow holes 24 are formed at equal intervals in the circumferential direction so as to surround the central opening 23. That is, the six central flow holes 24 are arranged at every central angle of 60 degrees. These six central flow holes 24 have the same shape and the same dimensions. An inner groove 25 extends from each central flow hole 24 to the middle in the radial direction outward in the radial direction. An inner groove wide portion 26 that extends in the circumferential direction is formed at the innermost portion of each inner groove 25, that is, at the outermost side in the radial direction.

  An outer groove 27 extends from the outer periphery of the steel plate 20 to the middle in the radial direction toward the middle in the radial direction at the central position at the angular position of the two inner grooves 25 adjacent to each other. There are six outer grooves 27 and they are arranged at a central angle of 60 degrees. An outer groove wide portion 28 extending in the circumferential direction is formed at the innermost side of each outer groove 27, that is, the innermost side in the radial direction. The inner groove wide portion 26 and the outer groove wide portion 28 have the same radial position and are arranged at equal intervals in the circumferential direction.

  Near the outer periphery of the steel plate 20, twelve rectangular permanent magnet through holes 29 are formed along the outer periphery at equal intervals in the circumferential direction. Each outer groove 27 is disposed in the center of two permanent magnet through holes 29 adjacent to each other.

  A plurality of steel plates 20 are laminated in the same direction to form steel plate groups 30 and 31. A plurality of such steel sheet groups 30 and 31 are formed. And in the other steel plate group 31 adjacent to one steel plate group 30, it superposes | shifts by 30 degree | times with a center angle.

  At this time, in each steel plate group 30 and 31, the through-hole and groove | channel of each steel plate 20 overlap and communicate in an axial direction. Further, the inner groove 25 of the steel plate group 30 and the outer groove 27 of the steel plate group 31 are at the same angular position, and the inner groove wide portion 26 and the outer groove wide portion 28 overlap to communicate in the axial direction. Similarly, the inner groove 25 of the steel plate group 31 and the outer groove 27 of the steel plate group 30 are at the same angular position, and the inner groove wide portion 26 and the outer groove wide portion 28 overlap to communicate in the axial direction. At this time, the inner groove 25 and the outer groove 27 communicate with each other at the joint portion between the steel plate group 30 and the steel plate group 31 to form a cooling air passage in the radial direction.

  With the configuration described above, in the rotating electrical machine of this embodiment, the cooling air flow path in the radial direction of the iron core can be formed without using a spacing piece, and the iron core 21 of the rotor 11 can be formed using one type of steel plate 20. It can be manufactured and the manufacturing cost can be reduced. Moreover, since the inner groove wide portion 26 and the outer groove wide portion 28 overlap and communicate in the axial direction, the flow passage area of the communication portion can be increased, and the flow in the radial direction can be promoted. Further, the axial flow can be promoted through the communication portion.

[Second Embodiment]
FIG. 4 is a front view showing a steel plate constituting the rotor core in the second embodiment of the rotating electrical machine according to the present invention.

  In this embodiment, the inner groove 25 has a uniform width in the circumferential direction, and extends linearly from the central flow hole 24 to the middle in the radial direction toward the outer side in the radial direction. There is no portion corresponding to the inner groove wide portion 26 (FIG. 1) in the first embodiment. The innermost groove 25, that is, the radially outermost end communicates with the outer groove wide portion 28 of the adjacent steel sheet group.

  In this embodiment, as compared with the first embodiment, the flow area of the communication portion between the inner groove 25 and the outer groove 27 of the adjacent steel plate groups is small, and the flow rate of the cooling air flowing therethrough is limited.

  Other operations and effects are the same as those of the first embodiment.

[Third Embodiment]
FIG. 5 is a front view showing an extracted steel plate constituting the core of the rotor in the third embodiment of the rotating electrical machine according to the present invention.

  In this embodiment, as in the second embodiment, the inner groove 25 has a uniform width in the circumferential direction, and extends linearly from the central flow hole 24 to the middle in the radial direction outward in the radial direction. Yes. Further, the outer groove 27 is also uniform in the circumferential width, and extends linearly from the outer periphery of the steel plate 20 toward the inside in the radial direction to the middle in the radial direction, and corresponds to the outer groove wide portion 28 (FIG. 4). There is no part to do. In this embodiment, as compared with the second embodiment, the flow area of the communication portion between the inner groove 25 and the outer groove 27 of the adjacent steel plate groups is smaller, and the flow rate of the cooling air flowing therethrough is limited. .

  Other operations and effects are the same as those of the second embodiment.

[Other Embodiments]
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, in the second embodiment, the outer groove wide portion 28 is provided and the inner groove wide portion 26 is not provided, but conversely, the outer groove wide portion 28 is not provided and the inner groove wide portion 26 is provided. Forms are also possible.

  In each of the above embodiments, one inner groove 25 communicates with each central circulation hole 24, but a plurality of inner grooves 25 may communicate with each central circulation hole 24.

  Moreover, in the said embodiment, the several steel plate piled up in the same direction was made into the steel plate group, and the direction of the mutually adjacent steel plate groups shall be shifted. As a modification of such a configuration, a single steel plate can be used as a group of steel plates to have the same configuration. In this case, since the inner groove 25 and the outer groove 27 are finely divided in the axial direction, the radial flow paths in these grooves are narrow, and the flow resistance is increased.

DESCRIPTION OF SYMBOLS 10 ... Rotating shaft 11 ... Rotor 12 ... Stator 13 ... Frame 14 ... Fan 20 ... Steel plate 21 ... Iron core 22 ... Permanent magnet 23 ... Center opening 24 ... Central flow hole 25 ... Inner groove 26 ... Inner groove wide part 27 ... Outer groove 28 ... Outer groove wide part 29 ... Permanent magnet through holes 30, 31 ... Steel sheet group 40 ... Gap

Claims (5)

A rotation axis;
A rotor fixed to the rotating shaft;
A stator disposed around the rotor through a radial gap radially outward of the rotor;
A frame disposed around the stator and to which the stator is fixed;
A rotating electric machine having
The rotor is
A core formed by laminating axially plurality of steel plates having the same shape to each other central opening in the axial direction through which the rotary shaft stretches vertically is formed of the rotary shaft,
A plurality of permanent magnets extending through the inside of the iron core in the axial direction;
With
For each of the plurality of steel plates,
A central opening through which the rotating shaft is inserted;
A plurality of permanent magnet through holes through which the plurality of permanent magnets penetrate;
A central flow hole through which the cooling fluid flows in the axial direction;
A plurality of inner grooves arranged at predetermined center angle intervals extending in the radial direction of the steel sheet toward the radially outer side in communication with the central circulation hole;
The angular position of the center of the two inner grooves that extend from the outer periphery of the steel sheet to the middle in the radial direction of the steel sheet and are adjacent to each other in the circumferential direction at a central angle interval equal to the predetermined central angle. A plurality of outer grooves arranged in the
Is formed,
Two of the steel plates stacked adjacent to each other are arranged shifted by an angle that is half of the predetermined center angle, and the inner groove of one of the two steel plates and the outer side of the other steel plate are out of these two sheets. The side groove is configured to communicate with the middle position in the radial direction,
Rotating electric machine.   The rotating electrical machine according to claim 1, wherein a wide portion extending in a circumferential direction is formed at an inner end portion of the plurality of outer grooves.   3. The rotating electrical machine according to claim 1, wherein a wide portion extending in a circumferential direction is formed at an outer end portion of the plurality of inner grooves.   The plurality of permanent magnets are arranged at equal intervals along the outer periphery near the outer periphery of the iron core, and each of the outer grooves is disposed between two adjacent permanent magnets of the plurality of permanent magnets. The rotating electrical machine according to any one of claims 1 to 3, wherein The iron core includes a first laminated steel plate block in which a plurality of adjacent steel plates are laminated at the same angular position, and a second lamination in which a plurality of adjacent steel plates are laminated at the same angular position. A steel plate block, and
The first laminated steel plate block and the second laminated steel plate block are laminated adjacent to each other while being shifted from each other by a half of the predetermined central angle. Item 5. The rotating electric machine according to any one of Items 4 to 4.

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