JP2018074759A - Rotor of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor of a rotary electric machine that can maintain strength of steel plates and construct a communication passage through which a refrigerant passage in a shaft can be communicated with a refrigerant passage in a rotor core by a laminated structure of steel plates of one kind.SOLUTION: The rotor of a rotary electric machine comprises a rotor core formed by laminating steel plates and a plurality of magnets arranged in the rotor core, where the rotor core comprises a plurality of storage parts for storing the magnets. The steel plates comprise a plurality of storage part forming holes which form the storage parts by laminating the steel plates thereon and a plurality of slits arranged adjacently to the storage part forming holes. The steel plates are rotated and laminated at prescribed angle at which the storage parts are formed, so that parts of the slits of one steel plate which contact each other and parts of the slits of the other steel plate are communicated with each other in a laminating direction and a refrigerant passage through which refrigerant for cooling the magnets in the rotor core is distributed is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor of a rotating electrical machine.

  Conventionally, in a rotor of a rotating electrical machine in which a magnet is embedded, it is known to cool the rotor using a refrigerant such as cooling oil. In this rotor, an electromagnetic steel sheet in which a through hole penetrating the shaft and a slit forming a refrigerant passage through which a refrigerant for cooling the magnet flows is axially formed in a rotor core supported by a shaft capable of supplying a refrigerant. The slits form a coolant passage by being stacked and combined. By the way, in such a rotor core, in order to cool a magnet efficiently, it is important to be able to supply the refrigerant uniformly in the circumferential direction inside the rotor core.

  In patent document 1, it is a rotor core which laminated | stacked the 1st electromagnetic steel plate and the 2nd electromagnetic steel plate in the axial direction, Comprising: The hole part which is formed in a 1st electromagnetic steel plate and comprises the refrigerant path of a rotor core, and is formed in a 2nd electromagnetic steel plate. The rotor core which formed in the position which the hole part which forms the said refrigerant path mutually shifted | deviated in the circumferential direction is disclosed.

Patent No. 5118920

  However, in the configuration of Patent Document 1, it is necessary to create a plurality of types of steel plates, and an apparatus for manufacturing each steel plate is required, so that there is a problem that production equipment costs are increased.

  Therefore, the present invention focuses on the above-described problem, and an object of the present invention is to provide a rotor of a rotating electrical machine that can supply a refrigerant uniformly in the circumferential direction inside the rotor core by a laminated structure of one type of steel plate.

  A rotor of a rotating electrical machine according to an aspect of the present invention includes a rotor core that is formed by stacking steel plates and supported by a shaft, and a plurality of magnets that extend in the axial direction of the rotor core. Here, the rotor core includes a plurality of accommodating portions that are disposed along the circumferential direction while accommodating the magnet. In addition, the steel plate is disposed adjacent to the housing portion forming hole, the housing portion forming holes forming the housing portion by stacking the steel plates, and the number of the housing portion forming holes and its divisor and multiples. Comprises a plurality of slits formed in different numbers and arranged in the circumferential direction. And, by rotating and laminating the steel plates at a rotation angle that forms the accommodating portion, a part of the slits of one steel plate and a part of the slits of the other steel plate that are in contact with each other communicate with each other in the laminating direction, and the magnet in the rotor core A refrigerant passage through which a refrigerant for cooling the refrigerant flows is formed.

  If it is the said aspect, the rotor provided with the refrigerant path which can supply a refrigerant | coolant uniformly in the circumferential direction by the laminated structure of one type of steel plate can be constructed, and the increase in cost can be suppressed. In addition, since the refrigerant passage is not only the end surface portion of the slit of the steel plate but also the portion that becomes the beam between the slits becomes the wall surface, the surface area of the wall surface forming the refrigerant passage is increased accordingly, and the cooling efficiency is increased. be able to.

FIG. 1 is a cross-sectional view along the axial direction of the rotating electrical machine according to the first embodiment. FIG. 2 is a plan view of steel plates stacked as a rotor core constituting the rotating electrical machine according to the first embodiment. FIG. 3 is a plan view in which the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG. FIG. 4 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core by a circle indicated by a one-dot chain line in FIG. 3. FIG. 5 is a schematic view when a laminated steel sheet in which a plurality of steel sheets shown in FIG. 2 are laminated in the same direction in the circumferential direction is rotated and laminated. FIG. 6 is a developed cross-sectional view of a rotor core formed by laminating the steel plate shown in FIG. 2 by rotating it 45 degrees counterclockwise. FIG. 7 is a plan view of a steel plate constituting the rotating electrical machine according to the second embodiment. FIG. 8 is a plan view when the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG. FIG. 9 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core by a circle indicated by a one-dot chain line in FIG. FIG. 10 is a developed cross-sectional view in the circumferential direction showing a skew boundary in the rotor core of the second embodiment. FIG. 11 is a plan view of a steel plate constituting the rotating electrical machine of the third embodiment. FIG. 12 is a plan view when the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG. FIG. 13 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core by a circle shown by a one-dot chain line in FIG. FIG. 14 is a plan view of a steel plate constituting the rotating electrical machine according to the fourth embodiment. FIG. 15 is a plan view when the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG. FIG. 16 is a cross-sectional view along the axial direction of the rotating electrical machine according to the fifth embodiment. FIG. 17 is a plan view of a steel plate constituting the rotating electrical machine according to the fifth embodiment. FIG. 18 is a plan view when the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG. FIG. 19 is a cross-sectional view along the axial direction of the rotating electrical machine according to the sixth embodiment. FIG. 20 is a plan view of a steel plate constituting the rotating electrical machine according to the sixth embodiment. FIG. 21 is a plan view when the same steel plate is rotated 90 degrees counterclockwise and stacked on the steel plate shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a cross-sectional view along the axial direction of the rotating electrical machine 10 according to the first embodiment. The rotating electrical machine 10 of this embodiment includes a stator 12 and a rotor 20. The stator 12 includes, for example, a cylindrical stator core 14 formed by laminating electromagnetic steel sheets punched into a substantially annular shape in the axial direction, and a plurality of teeth protruding at equal intervals in the circumferential direction inside the stator core 14. And a coil 16 wound around. A rotating magnetic field is generated inside the stator 12 by applying, for example, an alternating voltage to the coil 16 from the outside of the rotating electrical machine 10.

  The rotor 20 is disposed inside the stator 12 with a gap 18 therebetween. The rotor 20 includes a shaft 32 rotatably supported by a bearing 31 and a rotor core 22 fixed to the outer periphery of the shaft 32. The rotor 20 is configured to be rotationally driven by an attractive repulsive action against a rotating magnetic field generated on the inner peripheral side of the stator 12.

  The rotor core 22 has a cylindrical outer shape, for example. The rotor core 22 is configured by laminating (rotating and laminating) steel plates 38 (electromagnetic steel plates) punched in an annular shape in the axial direction, as will be described later. An insertion hole 24 through which the shaft 32 is inserted is formed in the central portion of the rotor core 22 so as to penetrate in the axial direction. The rotor core 22 is fixed to the shaft 32 by a method such as caulking, press-fitting, interference fitting (shrink fitting), welding, and screwing in a state where the shaft 32 is inserted into the insertion hole 24.

  A plurality of magnets 30 are embedded in the circumferential portion of the rotor core 22 at equal intervals in the circumferential direction (see FIG. 2). The magnet 30 is formed in the rotor core 22 and is accommodated in an accommodating portion 26 having substantially the same length as the rotor core 22 and extending along the axial direction.

  The shaft 32 is provided with a flange portion 35 connected to the end portion of the rotor core 22 in the stacking direction. An internal refrigerant passage 34 through which a refrigerant such as cooling oil (others may be water or air) flows is formed inside the shaft 32. A coolant passage 28 for circulating a coolant is formed inside the rotor core 22, and is formed adjacent to the magnet 30. The internal refrigerant passage 34 communicates with the refrigerant passage 28 that opens to the end portion in the stacking direction of the rotor core 22 via the central portion of the shaft 32 and the flange portion 35, so that the refrigerant can be supplied to the refrigerant passage 28. Yes. Details of the refrigerant passage 28 will be described later.

  The direction in which the refrigerant flows is indicated by broken-line arrows in the figure. The refrigerant is introduced into the internal refrigerant passage 34 by a pump (not shown) and supplied to the refrigerant passage 28 via the flange portion 35. The pump circulates the refrigerant in the rotor core 22 by pumping up the refrigerant discharged from the refrigerant passage 28.

  FIG. 2 is a plan view of steel plates 38 stacked as the rotor core 22 constituting the rotating electrical machine 10 according to the first embodiment. FIG. 3 is a plan view in which the same steel plate 38 is rotated 90 degrees and laminated on the steel plate 38 shown in FIG. FIG. 4 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core 22 with a circle indicated by a one-dot chain line in FIG.

  As shown in FIG. 2, the steel plate 38 accommodates the through hole 40 that forms the insertion hole 24 through which the shaft 32 is inserted by laminating the steel plate 38 and the accommodating portion 26 that is laminated by the steel plate 38. Part forming hole 42. Further, the steel plate 38 is formed with slits 44 that form the refrigerant passages 28 by rotating and laminating the steel plates 38.

  The through hole 40 is formed at the center of the steel plate 38. Further, the accommodating portion forming holes 42 are formed in the peripheral edge portion in the radial direction of the steel plate 38 at equal intervals in the circumferential direction around the through hole 40 (the axial center of the shaft 32). Here, in the present embodiment, eight accommodating portion forming holes are formed, and thereby, the rotating portion of the accommodating portion forming hole 42 is rotated by 90 degrees (or 45 degrees is possible) around the through hole 40. It overlaps with the accommodating portion forming hole 42 before rotation.

  In the present embodiment, nine slits 44 are formed at equal intervals in the circumferential direction around the through-hole 40 and adjacent to the accommodating portion forming hole 42. In the drawing, the circumferential length of the slits 44 and the circumferential length of the beams 46 between the slits 44 adjacent to each other in the circumferential direction are equal, but this is not restrictive. The number of the slits 44 can be arbitrarily designed as long as it is different from the number (eight) of the accommodating portion forming holes 42 and its divisor and multiple.

  As shown in FIG. 3, when the same steel plate 38 is laminated on the steel plate 38 while being rotated 90 degrees counterclockwise, the upper slit 44 and the lower slit 44a communicate with each other in the lamination direction. However, the upper slit 44 is shifted in the same direction as the rotation direction of the steel plate 38 in the circumferential direction with respect to the lower slit 44a, and a part of the upper slit 44 and a part of the lower slit 44a. Are communicated in the stacking direction.

  Therefore, when the steel plate 38 is rotated and laminated at a rotation angle of 90 degrees counterclockwise, as shown in FIG. 4, a part of one slit 44 and a part of the other slit 44 that are in contact with each other in the lamination direction are A plurality of slits 44 communicating in the stacking direction and shifted in the stacking direction are shifted so as to advance toward the rotation direction of the steel sheet in the stacking direction, and a helical coolant passage 28 is formed in the rotor core 22.

  In the present embodiment, since the steel plates 38 are rotated and laminated at a rotation angle of 90 degrees, when the four steel plates 38 are rotated and laminated on the steel plates 38, the circumferential direction of the first steel plate 38 and the last steel plate 38 laminated. Will be the same direction. Moreover, as shown in FIG. 4, although the refrigerant path 28 is formed in the mutually different position of the circumferential direction, these do not cross each other. Therefore, in the present embodiment, nine refrigerant passages 28 are formed in a spiral shape in the rotor core 22.

  Here, as in the present embodiment, a condition is considered in which the refrigerant passage 28 is formed by shifting the plurality of slits 44 continuous in the stacking direction so as to move forward in the stacking order toward the rotation direction of the steel plate 38.

  As shown in FIG. 3, the rotation direction is considered to be a counterclockwise rotation direction, and the position that is the end of the rotation direction of any one of the slits 44 is set as the rotation direction origin (zero degree). The angle at the end of the slit 44 adjacent in the rotation direction of the slit 44 with respect to the origin (the angle of the line connecting the end and the center of the through hole 40) is α, and the angle at the start is (1-P) · Let α be the rotation angle of the rotating stack. Here, the angle α is an angle obtained by dividing the total circumferential angle (360 degrees) by the number of slits 44. P represents the ratio (0 <P <1) between the angle α and the central angle at which the center of the through-hole 40 is expected from both ends in the circumferential direction of the slit 44, and the slit 44 is the center of the through-hole 40. The central angle to expect is α · P.

  When the slit 44 is rotated at the rotation angle θ, the slit 44 communicates with the slit 44a before rotation in the stacking direction, but is shifted to the rotational direction side with respect to the communicating slit 44a and rotates the slit 44a. It moves to a position separated from the adjacent slit 44b on the direction side. The end angle of the slit 44 is α + θ, and the start end angle is (1−P) · α + θ. On the other hand, the end angle of the slit 44a is [θ / α] · α + α (α <(θ / 2)), and the start end angle is [θ / α] · α + (1-P) · α. Furthermore, the angle of the starting end of the slit 44b is [θ / α] · α + α + (1−P) · α. [Θ / α] represents the maximum integer that does not exceed θ / α.

  In this embodiment, since it is a condition that the starting end of the slit 44 after rotation is disposed on the slit 44a before rotation, [θ / α] · α + (1-P) · α <(1-P ) · Α + θ <[θ / α] · α + α. To summarize this, 0 <(θ / α) − [θ / α] <P.

  Further, since it is a condition that the end of the slit 44 after the rotation is disposed on the beam 46 between the slit 44a and the slit 44b before the rotation, [θ / α] · α + α <α + θ <[θ / Α] · α + α + (1−P) · α. To summarize this, 0 <(θ / α) − [θ / α] <1-P.

  FIG. 5 is a schematic diagram when a laminated steel plate 38A in which a plurality of steel plates 38 shown in FIG. 2 are laminated in the same direction in the circumferential direction is rotationally laminated. As shown in FIG. 5, the rotor core 22 may be constructed by laminating a plurality of laminated steel plates 38 </ b> A formed by laminating a plurality of steel plates 38 at the same rotation angle at the rotation angle. Here, the steel plates 38 may be constructed by laminating two (or three or more) steel plates 38 in the same direction in the circumferential direction. And you may construct | assemble the rotor core 22 shown in FIG. 5 by laminating | stacking the laminated steel plate 38A with the rotation angle of 90 degree | times. Note that the number of laminated steel plates 38 in the laminated steel plate 38A need not be unified, and the number of laminated plates may be arbitrarily changed for each laminated steel plate 38A to be rotationally laminated. Thus, when the rotor core 22 is constructed, by rotating and laminating the laminated steel plates 38A, it is possible to reduce the number of rotational laminations and reduce the operation cost.

  FIG. 6 is a schematic view of the rotor core 22 formed by laminating the steel plate 38 shown in FIG. 2 by rotating it counterclockwise by 45 degrees. In this embodiment, since the accommodating part formation hole 42 is 8 times symmetrical, even if the steel plate 38 is rotated and laminated at a rotation angle of 45 degrees, the rotor core 22 including the refrigerant passage 28 can be constructed. In this case, by stacking nine steel plates 38, the slit 44 of the lowermost steel plate 38 and the slit of the uppermost steel plate 38 coincide in the circumferential direction.

[Effect of the first embodiment]
The rotor 20 of the rotating electrical machine 10 according to the first embodiment includes a rotor core 22 formed by laminating steel plates 38 and supported by a shaft 32, and a plurality of magnets 30 arranged extending in the axial direction of the rotor core 22. . Here, the rotor core 22 includes a plurality of accommodating portions 26 that accommodate the magnets 30 and are arranged side by side in the circumferential direction. In addition, the steel plate 38 includes a plurality of housing portion forming holes 42 that form the housing portion 26 by stacking the steel plates 38, and a housing portion that is disposed adjacent to the housing portion forming hole 42 and is formed in the steel plate 38. And a plurality of slits 44 formed in the circumferential direction with a number different from the number of the formation holes 42 and their divisors and multiples. Then, the steel plates 38 are rotated and laminated at a rotation angle that forms the accommodating portion 26, so that a part of the slits 44 of one steel plate 38 and a part of the slits 44 of the other steel plate 38 are in contact with each other in the stacking direction. In the rotor core 22, a refrigerant passage 28 through which a refrigerant for cooling the magnet 30 flows is formed.

  Thereby, the rotor 20 provided with the refrigerant passage 28 capable of supplying the refrigerant uniformly in the circumferential direction by the laminated structure of one kind of the steel plates 38 can be constructed, and an increase in cost can be suppressed. In addition, the refrigerant passage 28 has not only the end face portion of the slit 44 of the steel plate 38 but also the portion that becomes the beam 46 between the slits 44, so that the surface area of the wall surface forming the refrigerant passage 28 is increased accordingly. Thus, the cooling efficiency can be increased.

  The rotor core 22 is characterized in that a laminated steel plate 38A formed by laminating a plurality of steel plates 38 oriented in the same direction in the circumferential direction is rotationally laminated at the rotation angle. Thereby, when constructing the rotor core 22, by rotating and laminating the laminated steel plates 38A, it is possible to reduce the number of rotation laminations and reduce the operation cost.

  The rotation angle in the rotation stacking is θ, the total circumferential angle (360 degrees) is divided by the number of slits 44 formed in the steel plate 38, α is an angle obtained from the angle α and both ends of the slit 44 in the circumferential direction of the steel plate 38. When the ratio of the center angle to the center is P, 0 <(θ / α) − [θ / α] <P and 0 <(θ / α) − [θ / α] <1-P ([Θ / α] is a maximum integer not exceeding θ / α). As a result, the plurality of slits 44 connected in the stacking direction are displaced in the stacking order so as to advance toward the rotation direction of the steel plate 38, whereby the plurality of spiral refrigerant passages 28 can be formed.

[Second Embodiment]
FIG. 7 is a plan view of a steel plate 38 constituting the rotating electrical machine 10 (FIG. 1) according to the second embodiment. FIG. 8 is a plan view when the same steel plate 38 is rotated 90 degrees counterclockwise and stacked on the steel plate 38 shown in FIG. FIG. 9 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core 22 with a circle indicated by a one-dot chain line in FIG. In the following embodiment, the same number is attached | subjected to the component which is common in 1st Embodiment, and the description is abbreviate | omitted except the case where it is required.

  As shown in FIG. 7, in the steel plate 38 of the second embodiment, seven slits 44 are adjacent to the accommodating portion forming hole 42 and are formed at equal intervals in the circumferential direction. The circumferential length of the slit 44 is longer than the circumferential length of the beam 46 between the slits 44.

  As shown in FIG. 8, when the same steel plate 38 is laminated on the steel plate 38 while being rotated 90 degrees counterclockwise, the upper slit 44 and the lower slit 44a communicate with each other in the lamination direction. However, the upper slit 44 is shifted from the lower slit 44a in the circumferential direction in a direction opposite to the rotation direction of the steel sheet, and a part of the upper slit 44 and a part of the lower slit 44a are provided. Are communicated in the stacking direction.

  Therefore, when the steel plates 38 are rotated and laminated at a rotation angle of 90 degrees counterclockwise, as shown in FIG. 9, a part of one slit 44 and a part of the other slit 44 are in contact with each other in the lamination direction. A plurality of slits 44 communicating in the stacking direction and shifted in the stacking direction are shifted so as to recede in the direction opposite to the rotation direction of the steel plates in the stacking direction, and a spiral refrigerant passage 28 is formed in the rotor core 22. In the present embodiment, seven refrigerant passages 28 are formed at different positions in the circumferential direction, but they do not cross each other. Therefore, in the present embodiment, seven refrigerant passages 28 are formed in a spiral shape in the rotor core 22.

  As in the present embodiment, the first embodiment is based on the condition that the plurality of slits 44 connected in the stacking direction are displaced in the stacking order so as to move backward in the direction opposite to the rotation direction of the steel plate 33 to form the refrigerant passage 28. Think the same way. When the slit 44 is rotated at the rotation angle θ, the slit 44 communicates with the slit 44a before rotation in the stacking direction, but the slit 44 communicates at a position shifted to the opposite side of the rotation direction with respect to the communicating slit 44. It moves to a position away from the adjacent slit 44c on the opposite side of the rotation direction of 44a. The end angle of the slit 44 is α + θ, and the start end angle is (1−P) · α + θ. On the other hand, the end angle of the slit 44a is [θ / α] · α + 2α (α> (θ / 2)), and the start end angle is [θ / α] · α + α + (1−P) · α. Further, the end angle of the slit 44c is [θ / α] · α + α.

  In the present embodiment, since it is a condition that the starting end of the slit 44 after the rotation is disposed on the beam 46 between the slit 44a and the slit 44c before the rotation, [θ / α] · α + α <( 1−P) · α + θ <[θ / α] · α + α + (1−P) · α holds. To summarize this, P <(θ / α) − [θ / α] <1.

  Further, since it is a condition that the end of the slit 44 after rotation is disposed on the slit 44a before rotation, [θ / α] · α + α + (1−P) · α <α + θ <[θ / α].・ Α + 2α. To summarize this, 1−P <(θ / α) − [θ / α] <1.

  FIG. 10 is a developed sectional view in the circumferential direction showing the boundary of the skew 38B in the rotor core 22 of the second embodiment. A plurality of skews 38B formed by sequentially rotating a plurality of steel plates 38 in the stacking order may be constructed, and the rotor core 22 may be constructed by stacking the skews 38B. At this time, the relationship between the circumferential direction of one steel plate 38 and the circumferential direction of the other steel plate 38 is arbitrary at the boundary of the skew 38B. Therefore, there is a possibility that the slit 44 of the one steel plate 38 and the beam 46 of the other steel plate 38 face each other, and the refrigerant passage 28 is blocked at the boundary of the skew 38B.

  However, in the present embodiment, since the circumferential length of the slit 44 is formed to be longer than the circumferential length of the beam 46, the slit 44 is not completely blocked by the beam 46. Therefore, a part of the slit 44 of the one steel plate 38 and a part of the slit 44 of the other steel plate 38 communicate with each other. Therefore, the coolant passage 28 can be formed in the rotor core 22 even if the circumferential direction of the skew 38B is arbitrary.

  In the present embodiment, in the steel plate 38, the rotation angle is θ, the total circumferential angle is divided by the number of slits 44 formed in the steel plate 38, the angle α is α, and the angle α and the circumferential direction of the slit 44 from both ends of the steel plate 38. P <(θ / α) − [θ / α] <1 and 1−P <(θ / α) − [θ / α] < 1 (where [θ / α] is the maximum integer not exceeding θ / α). As a result, the plurality of slits 44 connected in the stacking direction are displaced in the stacking order so as to recede to the opposite side of the rotation direction of the steel plate 38, whereby the plurality of spiral refrigerant passages 28 can be formed.

  Further, the circumferential length of the slit 44 is longer than the circumferential length of the beam 46 between the slits 44 adjacent to each other in the circumferential direction. Thereby, the refrigerant passage 28 can be constructed in the rotor core 22 even if the rotation angle of the steel plates 38 to be rotationally laminated is arbitrary.

[Third Embodiment]
FIG. 11 is a plan view of a steel plate 38 constituting the rotating electrical machine 10 (FIG. 1) of the third embodiment. FIG. 12 is a plan view when the same steel plate 38 is rotated 90 degrees counterclockwise and stacked on the steel plate 38 shown in FIG. FIG. 13 is a developed cross-sectional view in the circumferential direction of a cut surface obtained by cutting the rotor core 22 with a circle indicated by a one-dot chain line in FIG. 12. In the rotor core 22 of the third embodiment, the refrigerant passage 28 is formed in a mesh shape. As shown in FIG. 11, the slits 44 are formed symmetrically six times, and are formed such that the circumferential length of the slits 44 is longer than the circumferential length of the beam 46.

  As shown in FIG. 12, when the same steel plate 38 is laminated on the steel plate 38 while being rotated 90 degrees counterclockwise, the slit 44 of the upper steel plate 38 faces the beam 46 of the lower steel plate 38, and Two adjacent slits 44 are simultaneously communicated in the stacking direction. Further, when the steel plate 38 is further rotated and laminated on the steel plate 38, the slit 44 of the uppermost steel plate 38 faces the lower beam 46, and the two slits 44 adjacent to each other simultaneously in the stacking direction. Communicate. Therefore, by repeating such rotation lamination, a mesh-like refrigerant passage 28 is formed in the rotor core 22 as shown in FIG.

  Consider a condition in which the mesh-like refrigerant passage 28 is formed by a plurality of slits 44 that are continuous in the stacking direction as in the present embodiment.

  As described above, when the slit 44 is rotated at the rotation angle θ, the end angle of the slit 44 is α + θ, and the start angle is (1−P) · α + θ. On the other hand, the angle at the end of the slit 44b before rotation that communicates with a part of the slit 44 in the rotation direction is [θ / α] · α + 2α (α> (θ / 2)), and the angle at the start end is , [Θ / α] · α + α + (1−P) · α. Further, the angle of the end of the slit 44c before rotation communicating with a part of the slit 44b after rotation in the part opposite to the rotation direction is [θ / α] · α + α, and the angle of the start end is [θ / α] · α + (1−P) · α.

  In the present embodiment, since it is a condition that the starting end of the slit 44 after rotation is disposed on the slit 44c before rotation, [θ / α] · α + (1-P) · α <(1-P ) · Α + θ <[θ / α] · α + α +. To summarize this, 0 <(θ / α) − [θ / α] <P.

  Further, since it is a condition that the end of the slit 44 after rotation is disposed on the slit 44b before rotation, [θ / α] · α + α + (1−P) · α <α + θ <[θ / α].・ Α + 2α. To summarize this, 1−P <(θ / α) − [θ / α] <1.

  In this embodiment, the slits 44 are formed so that 0 <(θ / α) − [θ / α] <P and 1−P <(θ / α) − [θ / α] <1. Thus, since the coolant passage 28 is formed in a mesh shape, the coolant can be supplied uniformly in the rotor core 22.

[Fourth Embodiment]
FIG. 14 is a plan view of a steel plate 38 constituting the rotating electrical machine 10 (FIG. 1) according to the fourth embodiment. FIG. 15 is a plan view when the same steel plate 38 is rotated 90 degrees counterclockwise and stacked on the steel plate 38 shown in FIG.

  Although illustration is omitted, in this embodiment, in order to generate a large reluctance torque, eight pairs of magnets (magnets 30) arranged in a V shape are embedded in the rotor core 22 in the circumferential direction. Correspondingly, the steel plate 38 has eight pairs of V-shaped accommodation portion forming holes 42a. A plurality of slits 44 (19 in FIG. 14 and FIG. 15) are formed in the steel plate 38, but the radial positions thereof are formed so as to periodically change in the order in which the slits 44 are arranged in the circumferential direction. . That is, the slit 44 is formed following the outer shape of the band 48 that circulates in the circumferential direction with amplitude in the radial direction with the rotation angle (45 degrees) related to the symmetry (8-fold symmetry) of the accommodating portion forming hole 42a as a period. ing. And the part which protruded to the outer side of the radial direction of the belt | band | zone 48 has entered between the accommodating part formation holes 42a of V shape arrangement | positioning in the circumferential direction. By forming the slit 44 in this way, the refrigerant passage 28 for cooling the magnet arranged at an arbitrary place such as a V-shaped magnet can be constructed at an arbitrary place.

  As shown in FIG. 15, when the same steel plate 38 is rotated 90 degrees counterclockwise and stacked on the steel plate 38 of this embodiment, the slits 44 of the newly stacked steel plates 38 are stacked on the slits 44 before rotation. Although it communicates in the direction, it is arranged at a position shifted in the rotational direction of the steel plate 38 with respect to the slit 44 before rotation as in FIG. Therefore, when this rotary lamination is repeated to construct the rotor core 22, 19 spiral refrigerant passages 28 (see FIG. 4 and the like) are formed.

[Fifth Embodiment]
FIG. 16 is a cross-sectional view along the axial direction of the rotating electrical machine 10 according to the fifth embodiment. FIG. 17 is a plan view of a steel plate 38a constituting the rotating electrical machine 10 according to the fifth embodiment. FIG. 18 is a plan view when the same steel plate 38a is rotated 90 degrees counterclockwise and stacked on the steel plate 38a shown in FIG. In the fifth embodiment, a refrigerant is supplied to the refrigerant passage 28 from the axial center of the rotor core 22 (from the shaft 32).

  A radial slit 50 that connects the through hole 40 and the slit 44 is formed in the steel plate 38a. As shown in FIG. 17, the radial slit 50 is integral with the through-hole 40 and extends outward in the radial direction, and communicates with one of the plurality of slits 44. Here, the steel plate 38a is obtained by adding a radial slit 50 to the steel plate 38 shown in the first embodiment (FIG. 2), but may be a steel plate 38 of another embodiment.

  On the other hand, in the shaft 32, the flange portion 35 (FIG. 1) is omitted, and the internal refrigerant passage 34 in the shaft 32 is formed to extend to a position reaching the end portion in the longitudinal direction of the shaft 32. A refrigerant supply port 36 communicating with the internal refrigerant passage 34 is formed on the side surface of the shaft 32. The refrigerant supply port 36 is formed at a position facing the radial slit 50. Therefore, the internal refrigerant passage 34 communicates with the radial slit 50 via the refrigerant supply port 36.

  Here, as shown in FIG. 18, when a steel plate 38a obtained by rotating the same steel plate 38a counterclockwise at a rotation angle of 90 degrees is laminated on the steel plate 38a shown in FIG. Two communication passages 56 are formed to communicate the 24 (through hole 40) and the refrigerant passage 28 (slit 44).

  As shown in FIG. 16, by continuing the rotational lamination with the steel plate 38 a at a rotation angle of 90 degrees, the rotor core 22 serving as the communication passages 56 in which the radial slits 50 respectively supply the refrigerant from the shaft 32 to the refrigerant passage 28. Can be built. However, it is preferable to use a steel plate 38 having no radial slit 50 at the portions constituting both ends of the rotor core 22 in the stacking direction.

  Also, nine sheets of steel plates 38a constituting a part of the rotor core 22 (preferably in the central region) are laminated at a rotation angle of 90 degrees, and the rest are laminated with the steel plates 38 (without the radial slits 50). The rotor core 22 that supplies the coolant from the shaft 32 to the passage 28 via the radial slit 50 can be constructed.

  In the present embodiment, the number of the slits 44 is different from the number of the accommodating portion forming holes 42 and their divisors and multiples. Therefore, by rotating and laminating the steel plates 38 a provided with the radial slits 50, the rotor core 22. The refrigerant can be supplied from the central portion to all the refrigerant passages 28 through the communication passages 56 (radial slits 50). In FIG. 16, one radial slit 50 is formed in the steel plate 38a, but two or more radial slits may be formed.

[Sixth Embodiment]
FIG. 19 is a cross-sectional view along the axial direction of the rotating electrical machine 10 according to the sixth embodiment. FIG. 20 is a plan view of a steel plate 38b constituting the rotary electric machine 10 according to the sixth embodiment. FIG. 21 is a plan view when the same steel plate 38b is rotated 90 degrees counterclockwise and stacked on the steel plate 38b shown in FIG. As in the fifth embodiment, the sixth embodiment is configured to supply a refrigerant (from the shaft 32) to the refrigerant passage 28 in the axial center of the rotor core 22.

  The steel plate 38b is provided with an inner slit 52 and an outer slit 54. The inner slit 52 is integral with the through-hole 40 and extends, for example, toward the outer side in the radial direction toward any one of the plurality of slits 44 and is separated from the slit 44. . The outer slit 54 is formed integrally with the slit 44 at a position rotated by the rotation angle (90 degrees) of the steel plate 38b in the circumferential direction from the inner slit 52, and extends radially inward toward the through hole 40 and penetrates, for example. It is formed so as to be separated from the hole 40. Here, the radially outer end of the inner slit 52 is formed to be radially outer than the radially inner end of the outer slit 54.

  On the other hand, a coolant supply port 36 communicating with the internal coolant passage 34 is formed on the side surface of the shaft 32. The refrigerant supply port 36 is formed at a position facing the inner slit 52. Therefore, the internal refrigerant passage 34 communicates with the inner slit 52 via the refrigerant supply port 36.

  Here, as shown in FIG. 21, when the steel plate 38b obtained by rotating the same steel plate 38b counterclockwise at a rotation angle of 90 degrees is laminated on the steel plate 38b shown in FIG. 20, the inner slit 52 and the outer slit 54 are laminated. Are communicated with each other in the stacking direction to form a communication passage 56 that communicates the through hole 40 and the slit 44.

  By continuing the rotation lamination with the steel plate 38b at a rotation angle of 90 degrees, as shown in FIG. 19, the inner slit 52 and the outer slit 54 are refrigerated from the shaft 32 (refrigerant supply port 36) to all the refrigerant passages 28. It is possible to construct the rotor core 22 that serves as the communication passage 56 for supplying the gas. However, it is preferable to use a steel plate 38 having no radial slit 50 at the portions constituting both ends of the rotor core 22 in the stacking direction.

  Further, by laminating 10 steel plates 38b constituting a part of the rotor core 22 (preferably the central region) at a rotation angle of 90 degrees and laminating the rest with the steel plates 38, the inner slits 52 and The rotor core 22 that supplies the coolant from the shaft 32 through the outer slit 54 can be constructed.

  Also in the present embodiment, since the number of the slits 44 is different from the number of the accommodating portion forming holes 42 and the divisor and multiple thereof, the steel plates 38b including the inner slits 52 and the outer slits 54 are rotationally laminated. Thus, the refrigerant can be supplied from the central portion of the rotor core 22 to all the refrigerant passages 28 via the communication passages 56 (the inner slit 52 and the outer slit 54). In FIG. 21, the inner slit 52 and the outer slit 54 may be formed on the opposite side of the through hole 40.

  As mentioned above, although embodiment of this invention was described, the said embodiment showed only a part of application example of this invention, and the meaning which limits the technical scope of this invention to the specific structure of the said embodiment. Absent.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine 20 Rotor 22 Rotor core 28 Refrigerant passage 30 Magnet 32 Shaft 38 Steel plate 44 Slit

Claims (8)

A rotor core formed by laminating steel plates and supported by a shaft;
A plurality of magnets arranged along the axial direction of the rotor core,
The rotor core is
A plurality of accommodating portions arranged to line up in the circumferential direction while accommodating the magnet,
The steel plate
A plurality of housing portion forming holes for forming the housing portion by laminating the steel plates;
A plurality of slits formed adjacent to the housing portion forming hole and arranged in the circumferential direction at a number different from the number of the housing portion forming hole and its divisor and multiple,
By rotating and laminating the steel plates at a rotation angle that forms the housing portion, a part of the slits of one of the steel plates that are in contact with each other and a part of the slits of the other steel plate communicate with each other in the laminating direction. A rotor for a rotating electrical machine, wherein a coolant passage through which a coolant for cooling the magnet flows is formed in the rotor core. The rotor of the rotating electrical machine according to claim 1,
The plurality of slits are
A rotor of a rotating electrical machine, wherein the radial position is formed so as to periodically change in the order of arrangement of the slits in the circumferential direction. In the rotor of the rotating electrical machine according to claim 1 or 2,
The rotor core is
A rotor of a rotating electrical machine, wherein a laminated steel plate formed by laminating a plurality of the steel plates at the same rotation angle is rotated and laminated at the rotation angle. The rotor of the rotary electric machine according to any one of claims 1 to 3,
The rotation angle is θ,
The angle obtained by dividing the total circumferential angle by the number of slits formed in the steel sheet is α,
When the ratio between the angle α and the central angle at which the center of the steel sheet is viewed from both ends in the circumferential direction of the slit is P,
0 <(θ / α) − [θ / α] <P and 0 <(θ / α) − [θ / α] <1-P
Or
P <(θ / α)-[θ / α] <1, and 1-P <(θ / α)-[θ / α] <1 (where [θ / α] exceeds θ / α Not the largest integer)
A rotor of a rotating electrical machine characterized by satisfying the above relationship. The rotor of the rotary electric machine according to any one of claims 1 to 3,
The rotation angle is θ,
The angle obtained by dividing the total circumferential angle by the number of slits formed in the steel sheet is α,
When the ratio between the angle α and the central angle at which the center of the steel sheet is viewed from both ends in the circumferential direction of the slit is P,
0 <(θ / α)-[θ / α] <P and 1-P <(θ / α)-[θ / α] <1 (where [θ / α] exceeds θ / α Not the largest integer)
A rotor of a rotating electrical machine characterized by satisfying the above relationship. The rotor of the rotary electric machine according to any one of claims 1 to 3,
The rotor of a rotating electrical machine, wherein the circumferential length of the slit is longer than the circumferential length of a beam between two slits adjacent to each other in the circumferential direction. The rotor of the rotary electric machine according to any one of claims 1 to 6,
Among the steel plates, the steel plate constituting at least a part of the rotor core,
A through hole through which the shaft passes;
A radial slit communicating with at least one of the through hole and the plurality of slits,
The shaft includes an internal refrigerant passage through which the refrigerant flows, and a refrigerant supply port that is formed at a position facing the radial slit and communicates with the internal refrigerant passage.
A rotor of a rotating electrical machine, wherein the steel sheet is rotationally laminated so that the radial slit serves as a communication passage for supplying the refrigerant from the shaft to the refrigerant passage. The rotor of the rotary electric machine according to any one of claims 1 to 6,
Among the steel plates, the steel plate constituting at least a part of the rotor core,
A through hole through which the shaft passes;
An inner slit formed integrally with the through hole and extending radially outward;
An outer slit formed integrally with the slit at a position rotated by the rotation angle in the circumferential direction from the inner slit and extending radially inward,
The shaft includes an internal refrigerant passage through which the refrigerant flows, and a refrigerant supply port that is formed at a position facing the inner slit and communicates with the internal refrigerant passage.
The rotating electrical machine characterized in that the inner slit and the outer slit communicate with each other in the stacking direction by rotating and laminating the steel plates, and a communication passage for supplying the refrigerant from the shaft to the refrigerant passage is formed. Rotor.

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