JP2010263758A - Rotor in cage-type induction machine and cage-type induction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the performance of cooling conductors at a rotor in a cage-type induction machine. <P>SOLUTION: A plurality of heat dissipation pieces 28, 29 are formed integrally on the inner peripheral surfaces of short circuit rings 18, 19. The heat dissipation piece 28 is formed so as to be projected into a penetration passage 160 from an edge 181 side of the short circuit ring 18 facing one edge 162 of the a rotor core 16, and the heat dissipation piece 29 is formed so as to be projected into the penetration passage 160 form the edge 191 side of the short circuit ring 19 facing the other edge 163 of the rotor core 16. Namely, parts of the heat dissipation pieces 28, 29 are projected into the penetration passage 160 through which a rotary shaft 17 passes. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor and a squirrel cage in a cage induction machine in which conductors are provided in a plurality of slots arranged in the circumferential direction of a rotor core.

  As a squirrel-cage induction machine, a rotor is configured by accommodating a plurality of conductors as secondary conductors in the rotor core while being arranged in the circumferential direction of the rotor core, and shorting both ends of the plurality of conductors with a short-circuit ring. Are known. In this squirrel-cage induction machine, when a current is passed through the stator winding wound around the stator core, a magnetic flux is generated from the stator, and this magnetic flux is interlinked in sequence with the conductors arranged in the circumferential direction of the rotor core. A current flows through each conductor in turn, and the rotor rotates due to the interaction between the current flowing through the conductor and the magnetic flux.

  In order to eliminate the heat generated in the rotor, in Patent Document 1, a hollow portion is formed in the rotor core, and a fan-shaped ventilation is provided between the outer peripheral surface of the rotating shaft passed through the hollow portion and the inner peripheral surface of the rotor. The device is interposed. The rotor core is supported on the rotation shaft via the ventilation device, and the rotation shaft, the ventilation device, and the rotor core rotate integrally. The rotating ventilation device cools the rotor by flowing the fluid in the hollow portion in the axial direction of the rotation shaft.

Special Table 2002-537748

  In order to cool the heat-generating conductor in the rotor, it is desirable to conduct the heat of the conductor to the ventilation region by the rotation of the ventilation device. However, Patent Document 1 does not disclose a specific configuration for that purpose, and the performance of cooling the conductor in the rotor is insufficient.

  An object of this invention is to improve the performance which cools the conductor in the rotor in a cage induction machine.

  In the present invention, a rotor core is provided inside a stator, and the rotor core includes a plurality of slots arranged in a circumferential direction thereof, and a conductor is provided in the slot. A short-circuit ring is provided on a pair of end faces so as to contact the conductor, and the rotor core is provided with a rotor in a squirrel-cage induction machine provided with a through passage extending in the direction of the rotation axis thereof. In the invention of claim 1, a heat radiator is provided in the short-circuit ring, the heat radiator includes a heat radiating piece, and at least a part of the heat radiating piece is inserted into the through passage. .

  The heat radiating piece rotates integrally with the rotor core. Part of the heat generated by the conductor in the rotor core is transferred to the heat radiating piece through the short-circuit ring, and the heat transferred to the heat radiating piece is transferred from the rotating heat radiating piece to the fluid in the through passage. Such heat transfer from the conductor to the heat radiating piece in the through passage enhances the performance of cooling the conductor.

In a preferred example, the heat dissipating piece is integrally formed with the short-circuit ring.
Such an integrated configuration contributes to an improvement in heat transfer.
In a preferred example, the radiator includes a circular ring fitted in the ring of the short-circuit ring or the through-passage, and the heat radiating piece is integrally formed with the circular ring.

  In a preferred example, a flow feeding device is interposed between the through wall circumferential wall surface and the outer circumferential surface of the rotary shaft, and the rotor core is configured to send the fluid along with the rotation of the rotary shaft. It is supported by the rotating shaft through a device.

The heat transferred to the heat radiating piece is transferred to the fluid sent by the flow sending device.
In a preferred example, the through passage has a plurality of feed passages penetrating the rotor core, and a recess that opens to the end surface and connects to the feed passage, At least a part of the heat dissipation piece is inserted.

The heat transferred to the heat radiating piece is transferred to the fluid in the recess.
A sixth aspect of the present invention is a squirrel-cage induction machine provided with the rotor according to any one of the first to fifth aspects.

  The present invention has an excellent effect that the performance of cooling a conductor in a rotor in a cage induction machine can be enhanced.

1 is a side sectional view showing a first embodiment. AA sectional view taken on the line AA of FIG. Sectional drawing of a rotor. Development view. A 2nd embodiment is shown and (a) is a sectional view of a rotor. (B) is a development view. Sectional drawing which shows another embodiment. Sectional drawing which shows another embodiment. Another embodiment is shown, (a) is a sectional side view. (B) is the BB sectional drawing of Fig.8 (a). Another embodiment is shown, (a) is a sectional side view. (B) is CC sectional view taken on the line of Fig.9 (a).

A first embodiment embodying the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the cage induction machine M includes a motor housing 10, an annular stator 11 fixed to the inner peripheral surface of the motor housing 10, and a rotor 15 rotatably supported by the motor housing 10. And.

  As shown in FIG. 2, the stator 11 constituting the squirrel-cage induction machine M includes an annular stator core 12 and windings 13 applied to slots 122 between a plurality of teeth 121 arranged on the inner periphery of the stator core 12. Consists of. The slots 122 are arranged at an equal pitch in the circumferential direction of the annular stator 11.

  As shown in FIG. 1, the stator core 12 is configured by laminating a plurality of core plates 14 made of a magnetic material (magnetic steel plate), and the rotor core 16 is a plurality of cores made of a magnetic material (magnetic steel plate). The plate 20 is laminated.

  The rotor 15 includes a cylindrical rotor core 16, a rotating shaft 17 that passes through a cylinder of the rotor core 16 (hereinafter referred to as a through-passage 160), and a pair of joints that are joined to both end faces 162 and 163 of the rotor core 16. Shorting rings 18 and 19 are provided. The rotor core 16 is supported on the rotating shaft 17 via a pair of blowers 21 and 22.

  As shown in FIG. 3, the air blower 22 includes an inner ring portion 23 fitted to the rotating shaft 17, an outer ring portion 24 fitted to the inner peripheral surface of the cylindrical rotor core 16, the inner ring portion 23, and the outer ring portion. 24 and a plurality of blades 25 connected to each other. The air blower 21 has the same configuration. The air blowers 21 and 22, the rotating shaft 17, and the rotor core 16 as flow feeding devices interposed between the outer peripheral surface 171 of the rotating shaft 17 and the peripheral wall surface 161 of the through passage 160 rotate integrally in the direction of arrow R. To do.

  As shown in FIG. 1, a plurality of slots 26 are formed in the rotor core 16 provided inside the annular stator 11 so as to penetrate in the direction of the rotation axis 151 of the rotor 15. Each slot 26 is filled with a conductor 27. The conductor 27 is short-circuited with both ends fixed to the short-circuit rings 18 and 19.

The rotor 15 rotates around the rotation axis 151 by energization control to the winding 13.
A plurality of heat dissipating pieces 28 and 29 (five each in this embodiment, as shown in FIG. 2) are integrally formed on the inner peripheral surfaces of the short-circuit rings 18 and 19. The heat radiating piece 28 is formed so as to protrude into the through-hole 160 from the end face 181 side of the short-circuit ring 18 facing one end face 162 of the rotor core 16, and the heat radiating piece 29 is formed on the other end face 163 of the rotor core 16. The shunt ring 19 is formed so as to enter the through passage 160 from the end surface 191 side of the opposing short-circuit ring 19. That is, a part of the heat radiation pieces 28 and 29 are inserted into the through passage 160. The short-circuit ring 18 and the heat radiating piece 28 constitute a heat radiator 30A, and the short-circuit ring 19 and the heat radiating piece 29 constitute a heat radiator 30B.

FIG. 4 is a development view in which the inner peripheral surface of the rotor core 16, the inner peripheral surface of the outer ring portion 24 of the blowers 21 and 22, and the inner peripheral surfaces of the short-circuit rings 18 and 19 are developed in a plane.
The motor housing 10 shown in FIG. 1 communicates with the atmosphere through an introduction passage (not shown) and a discharge passage (not shown). In the present embodiment, as the rotary shaft 17 rotates in the direction of arrow R, the blades 25 of the blowers 21 and 22 send air in the direction of the arrow Q [see FIG. As the blowers 21 and 22 rotate, air is introduced from the atmosphere outside the motor housing 10 into the motor housing 10 through the introduction passage. The air introduced into the motor housing 10 is sent from the blower 21 side to the blower 22 side through the through passage 160. The air sent from the blower 21 side to the blower 22 side through the through passage 160 flows out of the motor housing 10 from the discharge passage.

  Part of the heat generated in the conductor 27 near the outer peripheral surface of the rotor core 16 is transmitted to the heat radiating pieces 28 and 29 via the short-circuit rings 18 and 19. The heat transmitted to the heat radiating pieces 28 and 29 is transmitted to the air flowing through the through passage 160. That is, the heat transfer action between the heat dissipating pieces 28 and 29 in the through passage 160 and the air flowing through the through passage 160 brings about cooling of the vicinity of the outer peripheral surface of the rotor core 16.

In the first embodiment, the following effects can be obtained.
(1) The heat transferred from the conductor 27 to the heat radiating pieces 28 and 29 through the short-circuit rings 18 and 19 is transferred from the rotating heat radiating pieces 28 and 29 to the air flowing through the through passage 160. The air flow velocity in the motor housing 10 is the fastest in the through passage 160 provided with the blowers 21 and 22 that generate the air flow. The structure in which the heat dissipating pieces 28 and 29 that are integrally connected to the short-circuit rings 18 and 19 are inserted into the through-passage 160 having the highest air flow rate improves the performance of cooling the conductor 27 in the rotor core 16 (in the rotor 15). .

  (2) Compared to the case where the radiating pieces 28 and 29 are separately connected to the short-circuiting rings 18 and 19, the configuration in which the radiating pieces 28 and 29 are integrally formed with the short-circuiting rings 18 and 19, Increase heat transfer efficiency to. Such an integrated configuration contributes to an improvement in performance for cooling the conductor 27.

Further, such an integrated configuration contributes to simplification of the process of forming the radiators 30A and 30B.
Next, a second embodiment of FIG. 5 will be described. The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.

  FIG. 5B shows a development in which the inner peripheral surface of the rotor core 16, the inner peripheral surface of the outer ring portion 24 of the blower devices 21 and 22, and the inner peripheral surfaces of the short-circuit rings 18 and 19 are developed in a plane. Fig.5 (a) is the figure which looked at the thermal radiation piece 29A from the air blower 21 side.

  The heat dissipating pieces 28A and 29A are formed in a shape having air blowing surfaces 281 and 291 that are directed to the side opposite to the rotation direction R of the rotor core 16 along the rotation axis 151 from the air blowing device 21 side toward the air blowing device 22 side. ing. As the rotor core 16 rotates, the heat dissipating pieces 28A. The air blowing surfaces 281 and 291 of 29A send the air in the through passage 160 along the rotation axis 151 from the air blowing device 21 side to the air blowing device 22 side. The air blowing surfaces 281 and 291 generate a flow component of an air (cooling fluid) flow sent in the direction of the rotation axis 151 as the rotor core 16 rotates. The heat radiating pieces 28A and 29A having the air blowing surfaces 281 and 291 are advantageous in improving the efficiency of heat transfer from the heat radiating pieces 28A and 29A to the air.

In the present invention, the following embodiments are also possible.
As shown in FIG. 6, the heat radiating piece 28 </ b> B may be integrally formed on the inner peripheral surface of the annular ring 33 that is entirely inserted into the through passage 160. In this case, the heat radiating pieces 28B all enter the through passage 160, and the end face of the annular ring 33 is joined to the end face 181 of the short-circuit ring 18 (see FIG. 1). The short ring 18, the circular ring 33, and the heat dissipation piece 28 </ b> B constitute a heat radiator.

As shown in FIG. 7, the heat dissipating piece 28 </ b> C may be separately formed on the inner peripheral surface of the annular ring 33.
As shown in FIG. 8A, fan-type radiators 31A and 31B may be employed. As shown in FIG. 8B, the radiator 31 </ b> B includes an inner ring portion 311 fitted to the rotating shaft 17, an outer ring portion 312 fitted to the inner peripheral surface of the cylindrical rotor core 16, and the inner ring portion 311. And a plurality of heat dissipating pieces 313 connected to the outer ring portion 312. The configuration of the radiator 31A is the same as that of the radiator 31B. The inner ring portion 311 is in contact with the end faces 181 and 191 of the short-circuit rings 18 and 19.

  The rotor core 16, the rotating shaft 17, and the radiators 31A and 31B rotate integrally. As the radiators 31 </ b> A and 31 </ b> B rotate in the direction of the arrow R, the heat radiating piece 313 sends air in the direction of the arrow Q in the through passage 160.

In this embodiment, the same effect as the second embodiment of FIG. 5 is obtained.
○ As shown in FIGS. 9A and 9B, the recesses 32A and 32B are formed in the end faces 162 and 163 of the rotor core 16, and the rotary shaft 17 is inserted into the shaft through hole 164 passing through the bottom of the recesses 32A and 32B. Then, the rotor core 16 may be directly supported by the rotating shaft 17. In this case, a plurality of feed passages 165 extending in the direction of the rotation axis 151 are provided through the rotor core 16 so as to pass through the bottoms of the recesses 32A and 32B. The air on the blower 21 side flows through the feed channel 165 to the blower 22 side. The plurality of feed channels 165 and the recesses 32A and 32B constitute a through path.

  In the illustrated example, the number of the transmission channels 165, the number of the heat radiation pieces 28, and the number of the heat radiation pieces 29 are the same, and when viewed in the direction of the rotation axis 151, the transmission channels 165 and the heat radiation pieces 28, 29 are provided. And partially overlap. In such an overlapping configuration, a part of the air flow flowing from the blower device 21 side to the sending passage 165 hits the heat radiating piece 28, and a part of the air flow flowing out from the sending passage 165 to the blower device 22 side is a heat radiating piece. It hits 29. This increases the efficiency of heat transfer from the heat radiation pieces 28 and 29 to the air.

A blower similar to the blowers 21 and 22 may be provided outside the through passage 160.
Only one of the pair of blowers 21 and 22 may be adopted.
The ring 33 may be fitted in the rings of the short-circuit rings 18 and 19.

○ A gas or liquid other than air may be used as the cooling fluid.
The technical idea that can be grasped from the embodiment described above will be described below.
[1] The heat dissipation piece according to any one of claims 1 to 5, wherein the heat radiating piece has a blower surface that generates a flow component in the direction of the rotation axis along with the rotation of the rotor core. A rotor in a cage induction machine.

  11 ... Stator. 15 ... Rotor. 151: A rotational axis. 16 ... Rotor core. 160 ... a through passage. 161 ... A peripheral wall surface. 162, 163 ... end faces. 164 ... A shaft through hole. 165... 17 ... Rotating shaft. 171 ... Outer peripheral surface. 18, 19 ... Short circuit ring. 21, 22... Blower as a flow sending device. 26: Slot. 27: Conductor. 28, 28A, 28B, 28C, 29, 29A, 313. 30A, 30B, 31A, 31B ... radiator. 32A, 32B ... concave portions. 33 ... An annulus. M: A cage induction machine.

Claims (6)

A rotor core is provided inside the stator, and the rotor core includes a plurality of slots arranged in a circumferential direction thereof, and a conductor is provided in the slot, and a pair of end faces of the rotor core are provided on the pair of end faces. Is provided in such a manner that a short-circuit ring is in contact with the conductor, and in the rotor in the squirrel-cage induction machine in which the rotor core is provided with a through passage extending in the direction of the rotation axis thereof,
The short-circuit ring is provided with a radiator.
The radiator includes a radiator piece,
At least a part of the heat dissipating piece is a rotor in a squirrel-cage induction machine that is inserted into the through passage.   The rotor in a squirrel-cage induction machine according to claim 1, wherein the heat dissipating piece is integrally formed with the short-circuit ring.   2. The cage according to claim 1, wherein the radiator includes an annular ring fitted in the ring of the short-circuited ring or the through-passage, and the radiator piece is integrally formed with the annular ring. Rotor in induction machine.   Between the through-passage peripheral wall surface and the outer peripheral surface of the rotating shaft, a flow feeding device that sends fluid along with the rotation of the rotating shaft is interposed, and the rotor core passes through the flow feeding device. The rotor in the squirrel-cage induction machine according to any one of claims 1 to 3, wherein the rotor is supported by a rotating shaft.   The through passage has a plurality of feed passages penetrating the rotor core and a recess that opens to the end surface and connects to the feed passage. At least one of the heat radiating pieces is in the recess. The rotor in the squirrel-cage induction machine according to any one of claims 1 to 3, wherein the portion is plunged.   A squirrel-cage induction machine comprising the rotor according to any one of claims 1 to 5.

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