JP2005045941A - Rotor and permanent magnet electric device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor and a permanent magnet electric device capable of evenly cooling a permanent magnet piece provided on an outer peripheral part, with no limit in the number of magnetic poles in circumferential direction. <P>SOLUTION: A rotor 1 has three kinds of core members 21-23 laminated, and a coolant supply channel 13 which opens at one end in axial direction as well as at a plurality of positions on the outer peripheral part is formed while a coolant collection channel 17 which opens at the other end in axial direction as well as a plurality of positions on the outer peripheral part is formed. A cooling air is supplied to the coolant supply channel 13 and discharged into a gap 7, and then the cooling air is recovered from the gap 7 through the coolant collecting channel 17. Thus, the cooling air of low temperature is dispersed and supplied to the gap 7, for quick exchange. So, a permanent magnet piece of the rotor 1 and the coil of a stator 3 are efficiently and evenly cooled. The structure has no limit in the number of magnetic poles provided to the rotor, and is adaptable to a rotor of multiple poles. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotor in which a permanent magnet piece for driving is provided on an outer peripheral portion and a permanent magnet electric device including the rotor.

  In a permanent magnet motor in which a rotor having a permanent magnet piece attached to the outer peripheral surface portion of a rotor is provided in a stator having a coil, the permanent magnet piece generates heat due to eddy current loss, and the coil generates heat. Therefore, in a permanent magnet motor, it is necessary to cool a permanent magnet piece and a coil. The stator coil arranged on the outer side can be cooled from the outside, but the permanent magnet piece of the rotor arranged on the inner side cannot be cooled from the outside. Cooling is performed together with the coil by using a gap between the stators and causing cooling air to flow from one end in the axial direction toward the other end in the gap.

  In order to increase the efficiency of the permanent magnet electric device, the radial dimension of the gap between the rotor and the stator is made as small as possible, and it is difficult to allow cooling air to flow through the gap. Furthermore, since the temperature of the cooling air rises by cooling the permanent magnet pieces and the coils, the permanent magnet pieces and the coils can be efficiently cooled in the vicinity of one end in the axial direction, but as the other end in the axial direction is approached. Moreover, the cooling efficiency of a permanent magnet piece and a coil will worsen.

  As a prior art technique related to a rotor of a permanent magnet electric motor having a cooling structure, a permanent magnet piece is embedded inside the rotor, a passage that is inserted in the axial direction in the vicinity of the permanent magnet piece is formed, and cooling air is caused to flow through the passage. Techniques for cooling are known. In these prior art techniques, a partition plate is provided in the passage so as to protrude from the rotor in the axial direction, or the passage is formed to be inclined with respect to the axis, thereby allowing cooling air to flow down the passage (for example, Patent Documents). 1 and 2).

JP 2002-78291 A JP 2001-25209 A

  Such a conventional technique is a cooling structure in a rotor in which a permanent magnet piece is embedded inside, and is not a structure that can efficiently cool a rotor in which a permanent magnet piece is provided on the outer periphery. In addition, the structure is such that cooling air cools the permanent magnet piece while flowing in the passage from one axial end portion to the other end portion, and there remains a problem that the cooling efficiency on the other axial end side is deteriorated. The piece cannot be cooled uniformly. Furthermore, the configuration in which the passage is formed in the vicinity of the permanent magnet piece embedded inside cannot be applied to a rotor in which a large number of magnetic poles are formed in the circumferential direction.

  Accordingly, an object of the present invention is to provide a rotor capable of uniformly cooling a permanent magnet piece provided on the outer peripheral portion without limitation in the number of magnetic poles in the circumferential direction, and a permanent magnet electric device including the rotor.

The first aspect of the present invention includes a cylindrical stator provided with a driving coil, and a rotor housed in the stator and rotatably supported, and provided with a permanent magnet piece for driving on the outer periphery. A rotor of a permanent magnet electric device,
The rotor is characterized in that a refrigerant supply passage that opens at the outer peripheral portion is formed by a plurality of discharge ports spaced apart in the axial direction.

  According to the present invention, a refrigerant supply passage is formed in a rotor that is housed in a stator provided with a coil and is rotatably supported, and a permanent magnet piece for driving is provided on an outer peripheral portion. The refrigerant supply passage is opened at the outer peripheral portion by a plurality of discharge ports spaced in the axial direction. By supplying the refrigerant to the refrigerant supply passage, the refrigerant is discharged from a discharge port that opens at the outer periphery of the rotor, and is supplied to a gap between the rotor and the stator (hereinafter simply referred to as “gap”). be able to. Thus, since the refrigerant can be discharged from the plurality of discharge ports formed at intervals in the axial direction, the refrigerant can be supplied while being dispersed in the gap in the axial direction. This makes it possible to easily supply the refrigerant from the refrigerant supply passage to the gap from one end in the axial direction to the gap, and to disperse the low-temperature refrigerant in the axial direction. Can be supplied. Therefore, the permanent magnet pieces provided on the outer peripheral portion of the rotor can be efficiently and uniformly cooled, and the stator coil facing the gap can be efficiently and uniformly cooled. Such a structure is not limited in the number of magnetic poles provided in the rotor, and can be applied to a multipolar rotor.

  The present invention according to claim 2 is characterized in that a refrigerant recovery passage opening at the outer peripheral portion is formed by a plurality of suction ports spaced in the axial direction.

  According to the present invention, a refrigerant recovery passage is formed in the rotor. The refrigerant recovery passage is opened at the outer peripheral portion by a plurality of suction ports spaced in the axial direction. With this refrigerant recovery passage, the refrigerant in the gap can be sucked from the suction port and recovered. Since the refrigerant can be sucked from the plurality of suction ports formed at intervals in the axial direction as described above, the refrigerant in the gap whose temperature is increased by cooling the permanent magnet piece and the coil can be recovered. This makes it possible to easily recover the heated refrigerant dispersed in the entire gap, and to quickly replace the refrigerant in the gap with a low-temperature refrigerant, thereby improving the cooling efficiency.

The present invention according to claim 3 is a rotor configured by providing a permanent magnet piece on the outer periphery of the rotor core,
The rotor core includes a first core member in which a first through hole penetrating in the axial direction is formed in a portion excluding the outer peripheral portion, and a second core in which a second through hole penetrating in the thickness direction and opened in the radial direction is formed. The member is configured to be laminated so as to communicate the first and second through holes in the axial direction.

  According to the present invention, by laminating the first and second core members to form the rotor core, a passage that passes through the rotor core in the axial direction can be formed, and at a position spaced apart in the axial direction. The passage can be opened. This passage can be used as a refrigerant supply passage, and thus the rotor core in which the refrigerant supply passage is formed can be easily assembled.

The present invention according to claim 4 is a rotor configured by providing a permanent magnet piece on the outer periphery of the rotor core,
The rotor core includes a first core member in which a first through hole penetrating in the axial direction is formed in an even number of first regions arranged at equal intervals in a circumferential direction in a portion excluding the outer peripheral portion, and the first region. A second core member is formed in the corresponding second region with a second through-hole penetrating in the axial direction, and each second through-hole is opened radially outwardly every other second core member; A third core member in which a third through hole penetrating in the axial direction is formed in a third region that is every other region in the circumferential direction among the respective regions corresponding to the region, and is laminated in the axial direction. And
In the laminated configuration of the first to third core members in the rotor core, both end layers in the axial direction are respectively configured by the third core members, and each third core member is disposed with a displacement angle of the first region in the circumferential direction. A plurality of layers spaced apart from each other between the third core members are constituted by the second core member, and each second core member has a second region in which every other region in the circumferential direction is the third region. The second core members that are arranged so as to coincide with each other in the circumferential direction and are adjacent to each other in the axial direction are arranged so as to be shifted in the circumferential direction by the arrangement interval angle of the first region, except for the layer provided with the second and third core members. The remaining layer is constituted by a first core member, and each first core member is arranged such that the first region coincides with the second region in the circumferential direction.

  According to the present invention, the first to third core members are laminated to form the rotor core, whereby the rotor core is opened at one end in the axial direction and closed at the other end in the axial direction, and the axis A second passage that closes at one end in the direction and opens at the other end in the axial direction can be formed. These first and second passages are respectively opened at positions spaced apart in the axial direction. These first and second passages can be used as a refrigerant supply passage and a refrigerant recovery passage. Thus, the rotor core in which the refrigerant supply passage and the refrigerant recovery passage are formed can be easily assembled using the three types of core members.

The present invention according to claim 5 is a cylindrical stator provided with a driving coil;
The rotor according to any one of claims 1 to 4, wherein the rotor is housed in a stator and rotatably supported, and a permanent magnet piece for driving is provided on an outer peripheral portion.
It is a permanent magnet electric device characterized by including a refrigerant supply means for supplying a refrigerant to a refrigerant supply passage formed in the rotor.

  According to the present invention, a permanent magnet electric device capable of efficiently cooling the permanent magnet piece and the coil can be realized by supplying the refrigerant to the refrigerant supply passage of the rotor by the refrigerant supply means.

  According to the first aspect of the present invention, the refrigerant can be easily supplied to the gap from the refrigerant supply passage, and the refrigerant having a low temperature can be supplied while being dispersed in the axial direction. Therefore, the permanent magnet pieces provided on the outer peripheral portion of the rotor can be efficiently cooled, and the stator coil facing the gap can also be efficiently cooled.

  According to the second aspect of the present invention, the heated refrigerant dispersed in the entire gap can be easily recovered, and the refrigerant in the gap is quickly replaced with a low-temperature refrigerant to improve the cooling efficiency. can do.

  According to this invention of Claim 3, the rotor core in which a refrigerant | coolant supply path is formed can be easily assembled by laminating | stacking a 1st and 2nd core member and comprising a rotor core.

  According to the fourth aspect of the present invention, the refrigerant supply passage and the refrigerant recovery passage are formed by laminating the first to third core members, that is, by laminating three kinds of core members to constitute the rotor core. It is possible to easily assemble the rotor core.

  According to the fifth aspect of the present invention, it is possible to realize a permanent magnet electric device capable of efficiently cooling the permanent magnet piece and the coil.

  FIG. 1 is a cross-sectional view showing a permanent magnet motor 2 including a rotor 1 according to an embodiment of the present invention. The electric motor 2 is a permanent magnet electric device including a stator 3 provided with a driving coil and a rotor 1 provided with a driving permanent magnet piece. The electric motor 2 has a casing 4 in which the stator 3 and the rotor 1 are accommodated. For ease of illustration, the permanent magnet pieces and the coils are not shown.

  The stator 3 has a cylindrical shape and is fixed to the casing 4. The rotor 1 has a rotor body 5 and a rotor shaft 6 that passes through the rotor body 5 coaxially, and a permanent magnet piece is provided on the outer periphery of the rotor body 5. The rotor 1 is rotatably provided around an axis L of the rotor 1, which is an axis of the rotor shaft 6, with the rotor shaft 6 supported by the casing 4 while being accommodated coaxially in the stator 3.

  In the electric motor 2, when the coil is energized, the rotor 1 is rotated by the magnetic action between the permanent magnet piece and the coil. When the rotor 1 is rotated in this manner, the permanent magnet piece generates heat due to eddy current loss and generates heat when the coil is energized. Such heat generation leads to a decrease in the performance of the electric motor, so that it is necessary to cool the permanent magnet piece and the coil.

  Although the coil of the stator 3 arranged on the outer side can be cooled from the outside, the rotor 1 arranged on the inner side cannot be cooled from the outside, so the refrigerant supply means 8 is provided, The refrigerant supply means 8 supplies cooling air as a refrigerant to a radial gap (hereinafter sometimes simply referred to as a “gap”) 7 between the rotor 1 and the stator 3, and causes the rotor 1 to flow down. The permanent magnet piece provided on the outer periphery of the is cooled.

  FIG. 2 is a simplified perspective view showing a part of the rotor 1. FIG. 3 is a cross-sectional view showing a part of the rotor 1. FIG. 4 is a cross-sectional view showing a part of the rotor 1 cut at an angular position different from that in FIG. 3. 3 and 4 are both cross-sectional views cut along a plane including the axis L, and are cross-sectional views cut along a plane shifted by 45 degrees around the axis. Referring also to FIG. 1, the rotor body 5 of the rotor 1 is configured by attaching a permanent magnet piece (not shown for ease of illustration) to the outer peripheral portion of the rotor core 10. In the rotor core 10, a shaft insertion hole 11 that is inserted in the axial direction is formed in a central portion near the axis, and the rotor shaft 6 is inserted through the shaft insertion hole 11.

  In the rotor core 10, a refrigerant supply passage 13 that opens at the outer peripheral portion is formed by a plurality of discharge ports 12 spaced apart in the axial direction. The refrigerant supply passage 13 avoids the inner peripheral portion and the outer peripheral portion of the rotor core 10, extends in the axial direction at an intermediate portion sandwiched therebetween, opens at one end in the axial direction, and closes at the other end in the axial direction. And a supply branch passage portion 15 that branches from the supply main passage portion 14 at a plurality of positions spaced in the axial direction, extends outward in the radial direction, and opens at the outer peripheral portion. Therefore, each supply branch passage portion 15 is opened at each discharge port 12.

  The rotor core 10 is formed with a refrigerant recovery passage 17 that opens at the outer periphery by a plurality of suction ports 16 spaced apart in the axial direction. The refrigerant recovery passage 17 avoids the inner peripheral portion and the outer peripheral portion of the rotor core 10, extends in the axial direction at an intermediate portion sandwiched therebetween, closes at one end in the axial direction, and opens at the other end in the axial direction. And a recovery branch passage portion 19 that branches from the recovery main passage portion 18 at a plurality of positions spaced apart in the axial direction, extends outward in the radial direction, and opens at the outer peripheral portion. Accordingly, each recovery branch passage portion 19 is opened at each suction port 16.

  In the present embodiment, the rotor core 10 is formed with four refrigerant supply passages 13 and the same number of four refrigerant recovery passages 17. The respective refrigerant supply passages 13 are formed independently of each other at equal intervals in the circumferential direction, that is, every 90 degrees. The respective refrigerant recovery passages 17 are formed independently of each other at regular intervals in the circumferential direction, that is, every 90 degrees. The refrigerant supply passages 13 and the refrigerant recovery passages 17 are alternately formed in the circumferential direction, and the refrigerant supply passages 13 and the refrigerant recovery passages 17 adjacent to each other in the circumferential direction are formed at positions shifted from each other by 45 degrees. ing.

  In addition, the discharge ports 12 are formed at regular intervals in the axial direction and are formed at regular intervals in the circumferential direction, and the suction ports 16 are formed at regular intervals in the axial direction, and are circumferential. Are arranged at equal intervals. Each discharge port 12 of the refrigerant supply passage 13 adjacent to the circumferential direction and each suction port 16 of the refrigerant recovery passage 17 is suctioned between two discharge ports 12 adjacent to each other in the axial direction at a position shifted by 45 degrees in the circumferential direction. Each of the mouths 16 is formed so as to be formed one by one. In other words, the rotor core 10 is formed with a group of openings including the discharge ports 12 and the suction ports 16 in a zigzag pattern.

  FIG. 5 is a front view showing the first core member 21. FIG. 6 is a front view showing the second core member 22. FIG. 7 is a front view showing the third core member 23. The rotor core 10 is configured by using a plurality of core members 21 to 23 and laminating these core members 21 to 23 in the axial direction. Each of the core members 21 to 23 has three types of core members: a first core member 21, a second core member 22, and a third core member 23.

  The first core member 21 is arranged on a disc having the same outer diameter as the outer diameter of the rotor core 10 and arranged in the circumferential direction so as to surround the shaft hole 25 and the shaft hole 25. Then, eight first through holes 26 are formed. The shaft hole 25 is a circular hole constituting the shaft insertion hole 11 of the rotor core 10 and is formed by being inserted in the axial direction.

  Each of the first through holes 26 has an axial line in an even number that is arranged at equal intervals in the circumferential direction in the portion excluding the outer peripheral portion, that is, eight first regions that are arranged every 45 degrees in the circumferential direction in the present embodiment. It is formed to penetrate in the direction. Each first region is independent from each other, and is disposed in a portion excluding the inner peripheral portion facing the shaft hole 25. Each first through hole 26 has a substantially trapezoidal shape, and is formed by disposing a portion corresponding to a short base on the radially inner side. These first through holes 26 are independent from each other, are also independent from the shaft hole 25, and are not opened outward in the radial direction.

  The second core member 22 is arranged on a disc having the same outer diameter as the outer diameter of the rotor core 10, arranged in the circumferential direction so as to surround the shaft hole 27, and the first through hole 26. In this configuration, the same number of second through holes 28 are formed. The shaft hole 27 has the same configuration as that of the shaft hole 25 of the first core member 21, is a circular hole that forms the shaft insertion hole 11 of the rotor core 10, and is formed by being inserted in the axial direction.

  Each of the second through holes 28 is an area corresponding to the first area, and is evenly arranged in the circumferential direction in the portion excluding the outer peripheral part, in the present embodiment, in the eight second areas. , And penetrates in the axial direction. The region corresponding to the first region is a region that coincides with the first region when the first and second core members 21 and 22 are overlapped in the axial direction. Each second region is independent from each other, and is disposed in a portion excluding the inner peripheral portion facing the shaft hole 27. Each of the second through holes 28 has the same configuration as that of the first through hole 26, has a substantially trapezoidal shape, and is formed by arranging a portion corresponding to a short base on the radially inward side.

  Further, the regions on the radially outer side of every other region in the circumferential direction in each second region are cut out. Accordingly, every second through hole 28 is opened outward in the radial direction every other circumferential direction. As described above, the second through holes 28 are independent from each other and are also independent from the shaft hole 25, and are opened radially outward every other circumferential direction, and the remainder is opened radially outward. It has not been. That is, the second through holes 28 are alternately formed in the circumferential direction with second through holes 28a that are not opened outward in the radial direction and second through holes 28b that are opened outward in the radial direction. Hereinafter, when referring to an unspecified second through hole, the suffixes “a” and “b” are omitted.

  The third core member 23 is arranged on a disc having the same outer diameter as the outer diameter of the rotor core 10, and is arranged in the circumferential direction so as to surround the shaft hole 29 and the shaft hole 29. This is a configuration in which four third through holes 30, which are half the number, are formed. The shaft hole 29 has the same configuration as the shaft hole 25 of the first core member 21, is a circular hole that forms the shaft insertion hole 11 of the rotor core 10, and is formed by being inserted in the axial direction.

  Each of the third through holes 30 is formed so as to penetrate in the axial direction in a third region that is every other region in the circumferential direction among the regions corresponding to the first region. Each third region is independent from each other, and is disposed in a portion excluding the inner peripheral portion facing the shaft hole 29. Each of the third through holes 30 has the same configuration, has a substantially trapezoidal shape, and is formed by arranging a portion corresponding to a short base on the radially inner side. In FIG. 7, a region corresponding to the first region and having no third through hole is indicated by a virtual line.

  The first to third core members 21 to 23 shown in FIGS. 5 to 7 are laminated in the axial direction to constitute the rotor core 10. The specific laminated structure of the first to third core members 21 to 23 in the rotor core 10 is such that the axial end layers are respectively constituted by the third core members 23 and the axial end layers between which the third core members 23 are disposed. Among the intermediate layer group, a plurality of layers spaced apart in the axial direction are constituted by the second core member 22, and the remaining layers excluding the layers provided with the second and third core members 22, 23 are the first layers. A core member 21 is used. In the present embodiment, for example, the second core member 22 is provided in the sixth layer with a space of five layers from the third core member 23, and for every sixth layer with a space of five layers mutually. Is provided.

  Each of the third core members 23 arranged at both ends in the axial direction is first in the circumferential direction as shown in FIGS. 7 (1) and 7 (2) when viewed from one end in the axial direction toward the other end. The arrangement interval angle of one region, specifically 45 degrees, is arranged. That is, each 3rd core member 23 is arrange | positioned so that the 3rd through-hole 30 may shift | deviate 45 degrees in the circumferential direction.

  Each second core member 22 is disposed such that every other region in the circumferential direction in the second region coincides with the third region of the third core member 23 in the circumferential direction. More specifically, every other region in the circumferential direction of the second region coincides with the third region of one third core member 23, and the remaining region of the second region is the other third core member. It arrange | positions so that it may correspond with 23rd 3rd area | region. Further, the two second core members 22 adjacent in the axial direction are arranged so as to be shifted in the circumferential direction by an arrangement interval angle of the first region, specifically 45 degrees. That is, the two second core members 22 adjacent to each other in the axial direction are the second through holes 28a that are not opened to the outside of the one second core member 22 and the second holes that are opened to the outside of the other second core member 22. The second through-hole 28b that coincides with the second through-hole 28b and is not opened to the outside of the other second core member 22, and the second through-hole 28b that is opened to the outside of the one second core member 22. Arranged to match.

  Each first core member 21 is arranged such that the first region coincides with the second region 28 of each second core member 22 in the circumferential direction. Moreover, the 1st-3rd core members 21-23 are arrange | positioned coaxially, and are arrange | positioned so that each axial hole 25,27,29 may correspond in the surface perpendicular | vertical to an axial direction.

  Thus, the rotor core 10 in which the refrigerant supply passage 13 and the refrigerant recovery passage 17 are formed as described above can be formed by stacking the first to third types of core members 21 to 23 in combination. . That is, the rotor core 10 is formed with a refrigerant supply passage 13 that opens at one end in the axial direction and opens at a plurality of positions spaced apart in the axial direction and the circumferential direction in the outer peripheral portion, and opens at the other end in the axial direction. At the same time, a refrigerant recovery passage 17 is formed that opens at a plurality of positions spaced apart in the axial direction and the circumferential direction in the outer peripheral portion.

  Each of the first to third core members 21 to 23 is provided so as to be prevented from rotating on the rotor shaft 6 using, for example, a key. Moreover, the permanent magnet piece is affixed to the outer peripheral part in the area | region except the area | region where each discharge port 12 and each suction port 16 are formed.

  In the electric motor 2 including such a rotor 1, the refrigerant supply means 8 applies a differential pressure in the vicinity of both ends in the axial direction of the rotor 1 such that the vicinity of one end is high and the other end is low. As indicated by the symbol A, the cooling air can be supplied toward the axial end of the rotor core 10, and the cooling air can be supplied to the refrigerant supply passage 13 as indicated by the arrow B. The refrigerant supply means 8 includes, for example, a blower fan 8a that sends cooling air toward the vicinity of one end of the rotor core 10 in the axial direction, and a suction fan 8b that sucks cooling air from the vicinity of the other end of the rotor core 10 in the axial direction. Also good. The refrigerant supply means 8 takes in air from the outside, sends the air as cooling air toward the vicinity of one end of the rotor core 10 in the axial direction, and supplies the cooling air sucked from the vicinity of the other end in the axial direction of the rotor core 10 to the outside. The structure which discharges to may be sufficient. The cooling air sucked from the vicinity of the other axial end of the rotor core 10 is cooled by using a heat exchanger or the like, and is sent toward the vicinity of one axial end of the rotor core 10, that is, a circulation path in which the heat exchanger is interposed It may be configured to circulate.

  If comprised in this way, the cooling air supplied to the refrigerant | coolant supply channel | path 13 by the refrigerant | coolant supply means 8 will flow down the inside of the rotor 1, and as each arrow C shows, each discharge port opened at an outer peripheral part 12 and discharged to the gap 7 between the rotor 1 and the stator 3. In this way, the cooling air can be discharged from the plurality of discharge ports 12 formed to be spaced apart in the axial direction and the circumferential direction. Therefore, the cooling air is dispersed in the gap 7 in the axial direction and the circumferential direction. Can be supplied.

  Accordingly, the cooling air can be easily supplied to the gap 7 from the refrigerant supply passage 13 as compared with a configuration in which the cooling air is directly supplied to the gap 7 from one end in the axial direction. Since the temperature is not raised while flowing down, the cooling air having a low temperature can be distributed and supplied in the axial direction and the circumferential direction. Therefore, the permanent magnet pieces provided on the outer peripheral portion of the rotor 1 can be efficiently and uniformly cooled, and the coils of the stator 3 facing the gap 7 can be efficiently and uniformly cooled.

  Further, as indicated by an arrow D, the cooling air in the gap 7 is sucked and collected from each suction port 16 in the outer peripheral portion of the rotor 1, such as the suction port 16 in the vicinity of the discharge port 12 from which the cooling air was discharged, The refrigerant can be guided to the other end in the axial direction by the refrigerant recovery passage 17 and discharged as indicated by arrows E and F. As described above, the cooling air can be sucked from the plurality of suction ports 16 formed at intervals in the axial direction and the circumferential direction, so that the temperature is increased by cooling the permanent magnet pieces and the coils supplied by the refrigerant supply passage 13. The cooling air in the gap can be recovered. As a result, the raised cooling air dispersed in the gap 7 can be easily recovered, and the cooling air in the gap 7 can be quickly replaced with the cooling air having a lower temperature to improve the cooling efficiency.

  Furthermore, the rotor 1 that can form the cooling structure as described above can be realized by configuring the rotor core 10 by stacking the first to third core members 21 to 23. That is, by laminating the first to third core members 21 to 23, the rotor core 10 is opened at one end in the axial direction and closed at the other end in the axial direction, and closed at one end in the axial direction. A second passage opening at the other end in the axial direction can be formed. These first and second passages are respectively opened at positions spaced apart in the axial direction. These first and second passages become a refrigerant supply passage 13 and a refrigerant recovery passage 17. Thus, the rotor core 10 in which the refrigerant supply passage 13 and the refrigerant recovery passage 17 are formed can be easily assembled using the three types of core members 21 to 23.

  Moreover, the first to third core members 21 to 23 have an extremely simple structure as described above and are easy to manufacture. In addition, assembling may be performed by aligning a predetermined reference position in the circumferential direction with a similar reference position of other members or by shifting the arrangement interval angle (45 degrees) of the first region. What is necessary is just to be able to position, and it can assemble easily.

  By providing such a rotor 1, the cooling air is supplied to the refrigerant supply passage 13 of the rotor 1 by the refrigerant supply means 8, thereby realizing the electric motor 2 that can efficiently cool the permanent magnet piece and the coil. be able to. Such an electric motor 2 can be used, for example, as an electric motor incorporated in a ship pod (POD) propulsion device. Since the entire POD propulsion device is buried in water such as seawater and cooled from the outside, the structure of the present invention that mainly cools the rotor 1 is effective. Of course, it may be used other than the electric motor of the POD propulsion device.

  Further, in such a configuration, a permanent magnet piece cannot be provided in a portion where the discharge port 12 and the suction port 16 are formed in the outer peripheral portion, but a permanent magnet piece can be provided in other portions. The number is not limited, and the present invention can be suitably applied to a multipolar electric motor that forms 48 poles in the circumferential direction, for example. In addition, it can be realized by the configuration of only the rotor 1, and the configuration of the stator 3 is not limited, and the degree of freedom in design can be increased.

  FIG. 8 is a cross-sectional view showing an electric motor 2A including a rotor 1A according to another embodiment of the present invention. The electric motor 2A according to the present embodiment is similar to the electric motor 2 according to the above-described embodiment shown in FIGS. 1 to 7, and only different configurations will be described, and the same configurations are denoted by the same reference numerals and description thereof is omitted. To do. In the present embodiment, the refrigerant supply passage 13 is formed in the rotor 1A, but the refrigerant recovery passage 17 is not formed. The structure of the rotor 1A itself is the same as that of the rotor 1 of the above-described embodiment, and the first to third core members 21 to 23 are similarly laminated and open at one end in the axial direction and the other end in the axial direction. And a second passage that closes at one end in the axial direction and opens at the other end in the axial direction. These first and second passages are both used as the refrigerant supply passage 13.

  In the present embodiment, the refrigerant supply means 8A has two blower fans 8a that supply cooling air to the vicinity of both ends in the axial direction of the rotor 1A. By supplying the cooling air to the vicinity of both axial ends of the rotor core 10 by the refrigerant supply means 8A as indicated by the arrow A, the cooling air is supplied to the refrigerant supply passage 13 as indicated by the arrow B. Can be supplied. Similarly to the refrigerant supply unit 8 of the above-described embodiment, the refrigerant supply unit 8A may be configured to take in air from the outside and send the air as cooling air toward both ends in the axial direction of the rotor core 10. Furthermore, the structure which circulates through the circulation path where a heat exchanger is interposed may be sufficient. In this way, the cooling air can flow down the rotor 1A, be discharged from the discharge ports 12 as indicated by the arrow C, and be supplied to the gap 7 while being dispersed in the axial direction and the circumferential direction. .

  Further, in the present embodiment, a plurality of refrigerant discharge holes 35 are formed in the stator 3A at intervals in the axial direction. Each refrigerant discharge hole 35 is formed through the stator 3A in the radial direction. As a result, the cooling air supplied to the gap 7 flows down each refrigerant discharge hole 35 as indicated by an arrow G, is discharged to the outside of the stator, and is recovered as indicated by an arrow H.

  Even in such a configuration, the cooling air can be easily supplied from the refrigerant supply passage 13 to the gap 7 as compared with the configuration in which the cooling air is directly supplied to the gap 7 from one end in the axial direction. Since the temperature of the cooling air is not raised while flowing down the refrigerant supply passage, the cooling air having a low temperature can be distributed and supplied in the axial direction and the circumferential direction. Therefore, the permanent magnet piece provided on the outer peripheral portion of the rotor 1A can be efficiently cooled, and the coil of the stator 3A facing the gap 7 can be efficiently cooled.

  Of course, the effect of configuring the rotor core 10 with the first to third core members 21 to 23 can be similarly achieved. Further, in the configuration in which the cooling air is recovered by flowing the stator 3A in the radial direction in this way, a passage that leads from one end in the axial direction of the rotor 1 to the gap 7 and a passage that leads from the other end in the axial direction of the rotor 1 to the gap 7 And the cooling air is supplied by being distributed over the entire rotor 1A by the passages. If the refrigerant supply means 8A breaks down, the cooling air is supplied to either of the axial ends. Even if it becomes impossible, cooling air can be distributed and supplied to the gap 7, and a highly reliable electric motor can be realized.

  Each above-mentioned embodiment is only the illustration of this invention, and can change a structure within the scope of the present invention. For example, the rotor has a configuration in which eight passages are formed every 45 degrees in the circumferential direction. However, the present invention is not limited to this, and an even number of passages are formed alternately at one end in the axial direction. What is necessary is just the structure in which the channel | path which opens and the channel | path opened by the axial direction other end part are formed. Further, the specific shapes of the first to third members 21 to 23 are not limited, and the layer configuration is not limited. For example, the first to third through holes 26, 28, and 30 formed in the first to third core members 21 to 23 may have other shapes such as a circle, or the second core members adjacent in the axial direction. The number of first core members 21 disposed between 22 may be 1 to 4 and 6 or more. Of course, the thickness (axis dimension) of each of the first to third core members 21 to 23 is not limited and may be the same or different. Further, each discharge port 12 and each suction port 16 may be formed by being uniformly dispersed or may be formed by being non-uniformly dispersed. For example, it may be arranged based on the distribution of the amount of heat generated.

It is sectional drawing which shows the electric motor 2 provided with the rotor 1 of one Embodiment of this invention. 1 is a perspective view showing a part of a rotor 1 in a simplified manner. FIG. 2 is a cross-sectional view showing a part of the rotor 1. FIG. 4 is a cross-sectional view showing a part of the rotor 1 cut at an angular position different from that in FIG. 3. 4 is a front view showing a first core member 21. FIG. 3 is a front view showing a second core member 22. FIG. 4 is a front view showing a third core member 23. FIG. It is sectional drawing which shows 2 A of electric motors provided with the rotor 1A of the other form of implementation of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Rotor 2,2A Permanent magnet motor 3,3A Stator 4 Casing 5 Rotor main body 6 Rotor shaft 10 Rotor core 11 Shaft insertion hole 12 Discharge port 13 Refrigerant supply passage 16 Suction port 17 Refrigerant recovery passage 21 First core member 22 Second Core member 23 Third core member 26 First through hole 28 Second through hole 30 Third through hole

Claims (5)

A rotor of a permanent magnet electric device comprising: a cylindrical stator provided with a driving coil; and a rotor housed in the stator and rotatably supported, and provided with a driving permanent magnet piece on the outer periphery. ,
A rotor characterized in that a refrigerant supply passage that opens at an outer peripheral portion is formed by a plurality of discharge ports spaced apart in the axial direction.   The rotor according to claim 1, wherein a refrigerant recovery passage opening at an outer peripheral portion is formed by a plurality of suction ports spaced apart in the axial direction. A rotor configured by providing permanent magnet pieces on the outer periphery of a rotor core,
The rotor core includes a first core member in which a first through hole penetrating in the axial direction is formed in a portion excluding the outer peripheral portion, and a second core in which a second through hole penetrating in the thickness direction and opened in the radial direction is formed. 2. The rotor according to claim 1, wherein the member is laminated so as to communicate the first and second through holes in the axial direction. A rotor configured by providing permanent magnet pieces on the outer periphery of a rotor core,
The rotor core includes a first core member in which a first through hole penetrating in the axial direction is formed in an even number of first regions arranged at equal intervals in a circumferential direction in a portion excluding the outer peripheral portion, and the first region. A second core member is formed in the corresponding second region with a second through-hole penetrating in the axial direction, and each second through-hole is opened radially outwardly every other second core member; A third core member in which a third through hole penetrating in the axial direction is formed in a third region that is every other region in the circumferential direction among the respective regions corresponding to the region, and is laminated in the axial direction. And
In the laminated configuration of the first to third core members in the rotor core, both end layers in the axial direction are respectively configured by the third core members, and each third core member is disposed with a displacement angle of the first region in the circumferential direction. A plurality of layers spaced apart from each other between the third core members are constituted by the second core member, and each second core member has a second region in which every other region in the circumferential direction is the third region. The second core members that are arranged so as to coincide with each other in the circumferential direction and are adjacent to each other in the axial direction are arranged so as to be shifted in the circumferential direction by the arrangement interval angle of the first region, except for the layer provided with the second and third core members. The rotor according to claim 2, wherein the remaining layer is constituted by a first core member, and each first core member is disposed such that the first region coincides with the second region in the circumferential direction. A cylindrical stator provided with a driving coil;
The rotor according to any one of claims 1 to 4, wherein the rotor is housed in a stator and rotatably supported, and a permanent magnet piece for driving is provided on an outer peripheral portion.
A permanent magnet electric device comprising: refrigerant supply means for supplying refrigerant to a refrigerant supply passage formed in the rotor.

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