JP5065166B2 - Rotating electrical machine rotor - Google Patents

Description

  The present invention relates to a rotor of a rotating electrical machine, and more particularly to a rotor in which an axial ventilation hole is provided inside an iron core.

A rotor of a rotating electric machine such as an electric motor generates heat due to generation of Joule heat or the like due to energization of a coil. Therefore, a technique is known in which an axial ventilation hole is provided inside the iron core and cooling air is allowed to flow through the ventilation hole to cool the rotor (see Patent Document 1). Further, the core is divided into a plurality of core blocks in the axial direction, a spacing piece is disposed between the core blocks, and a radial ventilation path is provided between the steel plates of the two adjacent core blocks to form the core. A technique for guiding cooling air supplied through an internal axial ventilation hole to the outside in the radial direction is also known. As a conventional spacing piece, it is known to have a hook structure for preventing popping out due to centrifugal force.
JP 2007-300718 A

  In recent years, for example, in the field of industrial high-speed rotating electric machines for sending oil and gas, there is an increasing need for rotating electric machines that can withstand high-speed rotation. However, it is difficult to withstand a large centrifugal force due to high-speed rotation in the above-described conventional spacing piece hooking structure.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a structure that can maintain soundness even when the rotating electric machine rotates at high speed, and that effectively releases the heat inside the iron core by air cooling. And

  In order to achieve the above object, a rotor of a rotating electrical machine according to the present invention includes a shaft and a plurality of steel plates arranged around the shaft and extending perpendicularly to the shaft. A rotor of a rotating electrical machine having a core that is fixed to the core and a coil that is disposed in a plurality of core slots formed radially inward from the outer periphery of the core and extends in the axial direction. A plurality of core ventilation holes extending in the axial direction are formed, and each of the iron cores is divided into a plurality of core blocks each formed by superposing a plurality of the steel plates, and the two cores adjacent to each other are formed. An annular spacing plate is disposed at a position sandwiched in the axial direction by the block and fixed to the shaft, and the spacing plate is formed radially inward from the outer periphery at a position corresponding to the core slot. Coil A plurality of spacing plate slots passing in the direction, a plurality of spacing plate ventilation holes penetrating in the axial direction at positions corresponding to the iron core ventilation holes, and a radius from at least a part of the plurality of spacing plate ventilation holes to the spacing plate slot Ventilation grooves communicating in the direction are formed.

  According to the present invention, soundness can be maintained even when the rotating electric machine rotates at high speed, and the heat inside the iron core can be effectively released by air cooling.

  Hereinafter, an embodiment of a rotor of a rotating electrical machine according to the present invention will be described with reference to the drawings. Here, FIG. 1 is an upper half front view schematically showing a state in which the casing of one embodiment of the rotating electrical machine according to the present invention is removed. 2 is an overall perspective view showing only the spacing plate of the rotor of FIG. 1, and FIG. 3 is an enlarged perspective view of a portion III of the spacing plate of FIG.

  The rotor 1 of the rotating electrical machine of this embodiment is disposed so as to be rotatable within a cylindrical stator 2, a shaft 3, a rotor core 4 disposed around the shaft 3 and fixed to the shaft 3, And a rotor coil 6 disposed in a plurality of core slots (not shown) provided on the outer periphery of the rotor core 4.

  The rotor core 4 is configured by laminating a plurality of flat electromagnetic steel plates extending in a direction perpendicular to the shaft 3 in the axial direction and closely contacting each other in the axial direction. Each electromagnetic steel plate has a disk shape in which a hole through which the shaft 3 passes is formed at the center. A plurality of core slots are formed radially inward from the outer periphery of each electromagnetic steel sheet, and these core slots are arranged linearly in the axial direction, and the rotor coil 6 is axially disposed in these core slots. Are arranged so as to extend linearly.

  Iron core ventilation holes 9 and 10 are formed at positions closer to the shaft 3 than the bottom of the core slot of each electromagnetic steel sheet constituting the rotor iron core 4, and when the electromagnetic steel sheets are laminated, the iron core ventilation holes 9 and 10 are formed. Are arranged so as to extend linearly in the axial direction. The iron core ventilation holes 9, 10 include a plurality of inner iron core ventilation holes 9 that are relatively close to the shaft 3, and a plurality of outer iron core ventilation holes 10 that are located farther from the shaft 3 than the inner iron core ventilation holes 9. Yes.

  The rotor core 4 is divided into a plurality (two in the example shown in FIG. 1) of iron core blocks 11, and an annular spacing plate 12 is disposed so as to sandwich each of the iron core blocks 11 in the axial direction. Each core block 11 is formed by laminating a plurality of flat electromagnetic steel plates in the axial direction.

  As shown in FIGS. 2 and 3, the spacing plate 12 has a disk shape in which a central hole 15 through which the shaft 3 passes is formed. A plurality of spacing plate slots 20 are formed toward the center at equal intervals along the circumference of the spacing plate 12. Outer spacing plate ventilation holes 21 are formed at positions closer to the center from the bottom of each spacing plate slot 20, and one side of the spacing plate 12 communicates with each spacing plate slot 20 and the corresponding outer spacing plate ventilation hole 21. Ventilation groove 22 is formed in this. As a modification, the ventilation grooves 22 may be formed on both surfaces of the spacing plate 12. Inner spacing plate ventilation holes 23 are formed at positions closer to the center between the sets of two outer spacing plate ventilation holes 21 adjacent to each other in the circumferential direction.

  The spacing plate 12 is made of, for example, metal and can be formed by cutting from an integral metal disk. Thereby, it can be set as the robust structure which can endure high-speed rotation. The spacing plate 12 can be fixed by being fitted to the shaft 3 by shrink fitting, for example.

  In the state where the rotor 1 is assembled as shown in FIG. 1, the rotor coil 6 passes in the axial direction in each spacing plate slot 20, and the outer spacing plate ventilation hole 21 is axially connected to the outer iron core ventilation hole 10. The inner spacing plate ventilation hole 23 communicates with the inner iron core ventilation hole 9 in the axial direction.

  The cooling air 25 is sent in a predetermined axial direction into the inner iron core ventilation hole 9 and the outer iron core ventilation hole 10 by a fan (not shown). Then, it passes through the inner spacing plate ventilation hole 23 and the outer spacing plate ventilation hole 21 of each spacing plate 12. When the cooling air 25 passes through the outer spacing plate ventilation hole 21, a part of the cooling air 25 branches outward in the radial direction, passes through the ventilation groove 22, and around the rotor coil 6 in the spacing plate slot 20. Pass through to the outer peripheral side of the rotor 1. At this time, the rotor coil 6 is cooled. At this time, the coil on the stator side is also cooled.

  The cross-sectional area of the ventilation groove 22 is preferably changed according to the position of the spacing plate 12 in the axial direction. That is, since the pressure is higher on the upstream side in the axial direction due to the pressure loss of the cooling air flowing inside the inner iron core ventilation hole 9 and the inner spacing plate ventilation hole 23, the cross-sectional areas of the ventilation grooves 22 on the upstream side in the axial direction By making the size small, the flow rate of the cooling air flowing through each spacing plate slot 20 can be made uniform, and the rotor coil 6 can be cooled uniformly.

  The embodiment described above is merely an example, and the present invention is not limited to this. For example, in the above embodiment, only the outer core ventilation hole 10 communicates with the inner spacing plate ventilation hole 23 and the inner iron core ventilation hole 9 passes through the shaft 3 from one end to the other end. It is also possible to adopt a structure in which both of the inner core ventilation holes 9 communicate with the outer spacing plate ventilation holes 21. Further, it is not necessary that the ventilation holes formed in the rotor iron core 4 have two steps of the inner side and the outer side.

  Moreover, although the rotor core 4 was divided into two core blocks 11 in the above embodiment, it may be divided into three or more core blocks 11.

It is the upper half front view which shows typically the state which removed the casing of one Embodiment of the rotary electric machine which concerns on this invention. It is a whole perspective view which shows only the space | interval board of the rotor of FIG. FIG. 3 is an enlarged perspective view of a portion III of the spacing plate in FIG. 2.

Explanation of symbols

1: Rotor 2: Stator 3: Shaft 4: Rotor core (iron core)
6: Rotor coil 9: Inner core ventilation hole 10: Outer iron core ventilation hole 11: Iron core block 12: Space plate 15: Center hole 20: Space plate slot 21: Outer space plate ventilation hole 22: Ventilation groove 23: Inner space plate Ventilation hole 25: Cooling air

Claims (4)

A shaft, an iron core that is configured by overlapping a plurality of steel plates arranged around the shaft and extending perpendicularly to the shaft in an axial direction and fixed to the shaft, and is formed radially inward from the outer periphery of the iron core. A rotor of a rotating electrical machine having a coil disposed in a plurality of core slots and extending in the axial direction,
A plurality of core ventilation holes extending in the axial direction are formed in the iron core,
The iron core is divided into a plurality of iron core blocks each formed by overlapping a plurality of the steel plates,
An annular spacing plate is arranged at a position sandwiched in the axial direction by the two iron core blocks adjacent to each other and fixed to the shaft,
The spacing plate includes a plurality of spacing plate slots that are formed radially inward from the outer periphery at positions corresponding to the iron core slots and through which the coil passes in the axial direction, and at positions corresponding to the iron core ventilation holes in the axial direction. A plurality of spacing plate ventilation holes penetrating therethrough and a ventilation groove communicating in a radial direction from at least a part of the plurality of spacing plate ventilation holes to the spacing plate slot;
A rotor of a rotating electric machine characterized by   The rotor of a rotating electrical machine according to claim 1, wherein the spacing plate is an integrally formed product made of metal. The iron core ventilation hole includes an inner iron core ventilation hole arranged radially inside, and an outer iron core ventilation hole arranged radially outside.
The spacing plate ventilation hole includes an inner spacing plate ventilation hole communicating in the axial direction with the inner iron core ventilation hole, and an outer spacing plate ventilation hole communicating in the axial direction with the outer iron core ventilation hole,
The rotor of a rotating electrical machine according to claim 1, wherein the ventilation groove communicates the outer spacing plate ventilation hole and the spacing plate slot in a radial direction. There are a plurality of the spacing plates at different positions across at least one of the iron core blocks,
Cooling air flows through the iron core ventilation hole and the spacing plate ventilation hole in a predetermined axial direction, and a part of the cooling air branches off at the spacing plate ventilation hole and flows outwardly in the spacing plate slot via the ventilation groove. Configured as
The flow passage area of the ventilation groove of the spacing plate at a position on the upstream side in the axial direction of the cooling air passing through the iron core ventilation hole is smaller than the flow passage area of the ventilation groove of the spacing plate at a position on the downstream side in the axial direction. ,
The rotor for a rotating electrical machine according to any one of claims 1 to 3, wherein:

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