JP2013051768A - Rotary electric machine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine rotor that prevents turning of end plates fixed to a rotor shaft.SOLUTION: Inside a casing 12, a rotary electric machine 10 has a stator core 14, a rotary electric machine stator that has winding coils wound around the stator core 14, and a rotary electric machine rotor 20. The rotary electric machine rotor 20 has: a rotor shaft 22; a core portion 24 that is fixedly mounted to the rotor shaft 22; end plates 30 that are arranged at both axial ends of the core portion 24; and fixing members 40 that are arranged at both the axial ends of the end plates 30. The end plates 30 have convex/concave parts 34 in respective surfaces thereof facing the respective fixing members 40. In respective surfaces thereof facing the respective end plates 30, the fixing members 40 have convex/concave parts 44 that mesh with the convex/concave parts 34 of the respective end plates 30.

Description

  The present invention relates to a rotating electrical machine rotor, and more particularly, to a rotating electrical machine rotor having an end plate.

  The rotating electrical machine rotor includes a rotor shaft and a core portion fixedly attached to the rotor shaft. Further, end plates are provided on both ends of the core portion. To fix the core part that has end plates on both ends to the rotor shaft, insert both ends of the core part with the end plate and fix the end plate to the rotor shaft by caulking, or use a keyway and key member The end plate is fixed to the rotor shaft.

  For example, Patent Document 1 uses a non-magnetic austenitic stainless material as a motor end plate so that the magnetic core is not short-circuited between the magnetic poles. It is pointed out that the tightening allowance is loosened by the change and the end plate turns. Here, a plurality of grooves are arranged on the inner peripheral surface of the end plate, a plurality of grooves are also provided on the outer peripheral surface of the ring member for fixing the end plate to the shaft, and a plurality of holes are made to face the plurality of grooves on the end plate. A spring pin is inserted into this hole. This states that the end plate does not rotate even if there is a temperature change.

  Patent Document 2 discloses a configuration of a magnet motor rotor having a convex or concave portion on the electromagnetic steel plate laminate side, and the electric steel plate laminate having a concave or convex portion corresponding to the convex or concave portion of the end plate. ing. The electromagnetic steel sheet laminate and the end plate are connected by caulking at the opposing concave and convex portions.

  As a technique related to the cooling structure using the end plate in the present invention, Patent Document 3 discloses that a magnet cooling passage for cooling a permanent magnet of a rotor of a rotating electrical machine is formed along the axial direction inside the shaft. And a refrigerant passage that communicates with the refrigerant passage in the shaft, is formed inside the end plate, passes through the end of the permanent magnet, and is discharged to the outside.

  Further, as a cooling-related technique, Patent Document 4 discloses a structure in which oil can be scraped up by rotation of the rotor even when there is no oil in the air gap between the rotor outer periphery and the stator inner periphery. Here, a scraping member is used which extends in the axial direction from the end of the rotor beyond the coil end of the stator and extends from there to the radially outer peripheral side.

JP 2007-259583 A JP 2002-112481 A JP 2009-27837 A JP 2011-120417 A

  In the method of fixing the core part to the rotor shaft via the end plate, when the pressing load for pressing the end plate against the core part is lowered, the fixing is loosened and the end plate is rotated in the circumferential direction. As a cause of the reduction of the pressing load, as mentioned in Patent Document 1, the end plate and the core portion may cause thermal creep due to the temperature rise due to the operation of the rotating electrical machine. Further, it can be considered that the minute vibration between the end plate and the caulking member due to the rotation fluctuation and the progress of fretting wear due to the minute vibration between the end plate and the core portion are considered. In addition, when the key groove and the key member are used for fixing, the rotational fluctuation is received by the key member, which eventually causes wear.

  As described above, in the prior art, the holding load may be reduced due to various causes, and the fixing of the core portion to the rotor shaft via the end plate may be loosened.

  An object of the present invention is to provide a rotating electrical machine rotor capable of preventing rotation of an end plate fixed to a rotor shaft. Another object of the present invention is to provide a rotating electrical machine rotor having a cooling effect while preventing rotation of an end plate fixed to a rotor shaft. The following means contribute to at least one of these purposes.

  The rotating electrical machine rotor according to the present invention has a core portion attached to the rotor shaft and a plurality of concave portions or convex portions extending radially in the radial direction on the end surface opposite to the core surface facing the core portion, An end plate arranged at the axial end of the core portion, and a plurality of convex portions radially extending in the radial direction facing the end surface facing the end plate so as to engage with the plurality of concave or convex portions of the end plate Or it has a recessed part, It is arrange | positioned at the axial direction edge part of an end plate, The fixing member fixed to a rotor axis | shaft is provided.

  In the rotating electrical machine rotor according to the present invention, the plurality of recesses or projections of the end plate have an inclined mountain shape or an inclined valley shape having an inclined surface along the circumferential direction, and the plurality of recesses of the fixing member. Or it is preferable that a convex part has an inclined valley shape or an inclined mountain shape which has an inclined surface along the circumferential direction.

  Further, in the rotating electrical machine rotor according to the present invention, a rotor provided with a discharge port for discharging the refrigerant from a refrigerant passage provided inside along the axial direction toward a facing surface where the end plate and the fixing member face each other. A shaft is provided, and at least one of the end plate or the fixing member lacks at least one of a plurality of concave portions or convex portions, so that the refrigerant from the discharge port circulates on the meshing surface between the end plate and the fixing member. It is preferable that a gap is formed.

  With the above configuration, the rotating electrical machine rotor has an end plate having a plurality of concave or convex portions extending radially in the radial direction on the end surface opposite to the core surface facing the core portion, and an end surface facing the end plate And a fixing member having a plurality of convex portions or concave portions that are opposed to engage with the plurality of concave portions or convex portions of the end plate and extend radially in the radial direction. As described above, the fixing member and the end plate are configured by the concave-convex meshing structure. For example, even if the axial pressing load decreases due to thermal creep or fretting wear, the end plate rotates with respect to the fixing member by itself. There is nothing.

  Further, in the rotating electrical machine rotor, the plurality of concave portions or convex portions of the end plate have an inclined mountain shape or an inclined valley shape having an inclined surface along the circumferential direction, and the plurality of concave portions or convex portions of the fixing member are In addition, it has an inclined valley shape or an inclined mountain shape corresponding to this. That is, the concave / convex meshing structure between the fixing member and the end plate meshes with the inclined surface along the circumferential direction. Therefore, for example, even if there is a displacement between the fixing member and the end plate along the circumferential direction due to thermal creep or fretting wear, the circumferential displacement is converted into an axial displacement by the action of the inclined surface. Is done. As a result, the end plate is pressed against the core portion side, and displacement is less likely to occur.

  Further, in the rotating electrical machine rotor, the rotor shaft is provided with a refrigerant passage inside, and a discharge port through which the refrigerant is discharged is provided from the refrigerant passage toward a facing surface where the end plate and the fixing member face each other. And at least one of the end plate or the fixing member lacks at least one of the plurality of concave portions or convex portions, so that a gap through which the refrigerant from the discharge port circulates on the meshing surface between the end plate and the fixing member. Is formed. Accordingly, the rotor can be further cooled while the end plate is prevented from rotating, and the stator disposed on the outer peripheral side of the rotor can be cooled.

It is a figure which shows the structure of the rotary electric machine containing the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which shows the detail of the end plate and fixing member in the rotary electric machine stator of embodiment which concerns on this invention. In the rotary electric machine stator of embodiment which concerns on this invention, it is a figure which shows the effect when the shift | offset | difference along the circumferential direction arises between an end plate and a fixing member. In the rotating electrical machine stator according to the embodiment of the present invention, the uneven structure of the end plate shows an effect of contributing to cooling of the stator. It is a figure which shows the effect | action which can cool a rotor and a stator in the rotary electric machine stator of embodiment which concerns on this invention, performing the rotation prevention of an end plate. It is a figure which shows the cross section of the end plate and fixing member used in the structure of FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, it is described that the magnetic steel sheets are laminated as the core portion and the permanent magnets are embedded therein. However, this is an example, and the permanent magnets may be disposed on the surface of the magnetic steel sheets. It may be a reluctance core that does not use a magnet. A core piece other than the electromagnetic steel sheet may be laminated. In the following, an inclined mountain shape or an inclined valley shape will be described as the shape of the uneven portion, but it is sufficient that the opposing uneven shapes mesh with each other and become a resistance shape when rotating around the axis, and has a linear inclination. You don't have to. The number of the concavo-convex shapes shown in the figure, the inclination angle of the concavo-convex shapes, etc. are examples for explanation, and can be appropriately changed according to the specifications of the rotating electrical machine rotor.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating a configuration of a rotating electrical machine 10 in which the rotating electrical machine rotor 20 is used. The rotating electrical machine 10 includes a stator core 14 inside the case 12, a rotating electrical machine stator that includes a winding coil wound around the stator core 14, and an inner peripheral side of the rotating electrical machine stator. The rotary electric machine rotor 20 arrange | positioned at is comprised.

  The stator core 14 constituting the rotating electrical machine stator is a magnetic steel sheet formed into a predetermined shape having a protruding portion called a tooth and a space for winding a winding coil provided between adjacent teeth and called a slot. A plurality of sheets are laminated. As winding coils wound around the stator core 14, FIG. 1 shows coil ends 16 and 18 protruding from both axial ends of the stator core 14.

  The rotating electrical machine rotor 20 includes a rotor shaft 22, a core portion 24 fixedly attached to the rotor shaft 22, end plates 30 disposed at both ends in the axial direction of the core portion 24, and a shaft of the end plate 30. It is comprised including the fixing member 40 arrange | positioned at the both ends of a direction, respectively.

  The rotor shaft 22 is a shaft member that serves as an output shaft when configured as the rotating electrical machine 10. A refrigerant passage is provided in the rotor shaft 22 along the axial direction, and the content thereof will be described later with reference to FIGS. 5 and 6.

  The core portion 24 is formed by laminating electromagnetic steel sheets, like the stator core 14, but permanent magnets are embedded inside the laminated electromagnetic steel sheets. The permanent magnet is inserted into a magnet insertion hole provided in a predetermined arrangement relationship along the circumferential direction, whereby the magnetic pole of the core portion 24 is formed. The magnet insertion hole is opened along the axial direction, and a rod-like permanent magnet is inserted into the magnet insertion hole.

  The end plates 30 are disk-shaped members that are provided at both ends of the core portion 24 in the axial direction and have a function of sandwiching the core portion 24 from both sides. The core part 24 is sandwiched from both sides so that the magnetic steel sheets on which the core part 24 is laminated are not peeled off from each other, and the permanent magnet embedded in the magnetic steel sheet laminate along the axial direction is popped out by centrifugal force or the like. This is to prevent it from occurring.

  The fixing members 40 are respectively provided at the axial ends of the end plates 30 provided at both ends of the core portion 24 in the axial direction, and the rotor shaft 22 is sandwiched between the end plates 30 via the end plates 30 at both ends. It is a member fixed to. The fixing between the fixing member 40 and the rotor shaft 22 is performed by a well-known fixing structure using a key groove and a key member (not shown). Instead of the fixing structure using the key groove and the key member, a caulking structure in which the fixing member 40 is caulked directly to the rotor shaft 22 may be used.

  Here, the end plate 30 has an uneven portion 34 on the surface facing the fixing member 40, and the fixing member 40 is set to engage with the uneven portion 34 of the end plate 30 on the surface facing the end plate 30. It has an uneven portion 44.

  FIG. 2 is a detailed view showing a pair of end plates 30 and a fixing member 40 facing the end plates 30.

  The end plate 30 is a disc 32 having a center hole 36 through which the rotor shaft 22 passes in the center, and is on the end surface opposite to the core surface facing the core portion, that is, on the surface facing the fixing member 40. A plurality of concave and convex portions 34 extending radially from the central hole 36 in the radial direction are provided. Here, the plurality of concavo-convex portions 34 can be said to be a repetition of a concave portion or a repetition of a convex portion depending on the way of viewing. Therefore, the plurality of concave and convex portions 34 can be referred to as a plurality of concave portions or convex portions. As shown in FIG. 2, the plurality of uneven portions 34 has an inclined mountain shape having an inclined surface along the circumferential direction. Here, since the inclined mountain shape is an inclined valley shape depending on the way of viewing, it can be said that the plurality of uneven portions 34 has an inclined mountain shape or an inclined valley shape.

  The fixing member 40 is a flanged cylindrical member having a center hole 46 through which the rotor shaft 22 passes. The flange 42 has an outer diameter smaller than the outer diameter of the end plate 30, and has a plurality of concave and convex portions 44 that extend radially from the center hole 46 in the radial direction on the surface of the surface facing the end plate 30. The plurality of uneven portions 44 have an inclined mountain shape or an inclined valley shape having an inclined surface along the circumferential direction. When the fixing member 40 and the end plate 30 are opposed to each other, each of the plurality of uneven portions 44 provided on the fixing member 40 has a corresponding shape so as to engage with the plurality of uneven portions 34 provided on the end plate 30. Is set.

  Both the uneven portion 34 of the end plate 30 and the uneven portion 44 of the fixing member 40 have surfaces that extend radially from the center holes 36 and 46 to the outer peripheral side and are inclined along the circumferential direction. With this structure, when the concavo-convex portion 34 and the concavo-convex portion 44 face each other, they can mesh with each other, and resistance acts when attempting to rotate around the central holes 36 and 46 in this state. As described above, the uneven portions 34 and 44 have a structure having a detent function for preventing relative rotation between the end plate 30 and the fixing member 40.

  The operational effects of this configuration will be described in detail below using the drawings as necessary. In the above configuration, the fixing member 40 is fixed to the rotor shaft 22, and by the fixing, the end plate 30 is pressed in the axial direction, and the core portion 24 is sandwiched and fixed from both ends in the axial direction via the end plate 30. The axial pressing load used for fixing may be reduced by thermal creep due to temperature changes, fritting wear, or the like. Even in such a case, as described with reference to FIG. 2, the end plate 30 and the fixing member 40 are engaged with each other by the concavo-convex portions 34 and 44, so that the end plate 30 does not easily rotate around the axis.

  Further, the rotational fluctuation, inertial force, and the like received by the rotating electric machine rotor 20 are not only fixed structures using the key groove and the key member, but also the end plate 30 and the fixing member 40 are formed on the meshing surfaces of the uneven portions 34 and 44. You will receive it in all areas. As a result, rotational fluctuation, inertial force and the like can be sufficiently received, and wear of the keyway and the key member can be suppressed.

  A case where the end plate 30 is displaced relative to the fixing member 40 in the circumferential direction will be described with reference to FIG. FIG. 3 is a diagram showing a state of engagement between the end plate 30 and the fixing member 40 as viewed from the direction A in FIG. When the end plate 30 is displaced with respect to the fixing member 40 in the circumferential direction, the concave and convex portions 34 and 44 are engaged with each other in an inclined mountain shape. Produce power. The force of the axial direction component acts to press the end plate 30 toward the core portion 24 as shown in FIG. As a result, the circumferential displacement of the end plate 30 is less likely to occur.

  4 is a view showing the end plate 30 from the direction B in FIG. FIG. 4 further shows the coil end 16 when the rotating electrical machine rotor 20 constitutes the rotating electrical machine 10. When the rotating electrical machine 10 is configured, if the refrigerant 50 that cools the coil end 16 hangs down from the coil end 16, it will be applied to the end plate 30. In this case, since the end plate 30 rotates integrally with the rotor shaft 22, the refrigerant 50 applied to the end plate 30 is guided to the valleys of the concavo-convex part 34, and the outer periphery of the end plate 30 is rotated by the centrifugal force of rotation. A radial flow 52 is sprayed from the end toward the coil end 16. That is, the refrigerant dripping from the coil end 16 is blown again to the coil end 16. Thereby, the coil end 16 can be cooled efficiently.

  With respect to the cooling of the rotating electrical machine 10, by providing a notch in the uneven portions 34 and 44, effective cooling can be performed while preventing the end plate 30 from rotating. FIG. 5 and FIG. 6 are diagrams for explaining the situation. 3 corresponds to FIG. 1, and FIG. 6 corresponds to FIG.

  A refrigerant passage through which the refrigerant 60 flows is provided along the axial direction inside the rotor shaft 22 of the rotating electrical machine rotor 20. That is, the rotor shaft 22 has a hollow shaft structure. The rotor shaft 22 is provided with a discharge port 26 through which the refrigerant 60 is discharged toward a facing surface where the end plate 30 and the fixing member 40 face each other. Then, as shown in FIG. 6, at the uneven portions 34 and 44 where the end plate 30 and the fixing member 40 are engaged, at least one of the plurality of protruding portions of the fixing member 40 is notched, and the uneven portion of the end plate 30 is A gap 46 is formed between the two and 44. In this example, the convex portion of the fixing member 40 is cut out, but the convex portion of the end plate 30 may be cut out to form a gap with the concave and convex portion 34 of the fixing member 40.

  The gap 46 overlaps with the discharge port 26 of the rotor shaft 22, whereby the refrigerant passing through the rotor shaft 22 blows out from the discharge port 26 toward the coil ends 16 and 18 through the gap 46. In this way, it is possible to effectively cool the rotary electric machine rotor 20 and the coil ends 16 and 18 while realizing the rotation prevention of the end plate 30.

  The rotating electrical machine rotor according to the present invention can be used for a rotating electrical machine mounted on a vehicle.

  10 rotating electrical machines, 12 cases, 14 stator cores, 16, 18 coil ends, 20 rotating electrical machine rotors, 22 rotor shafts, 24 core parts, 26 outlets, 30 end plates, 32 discs, 34, 44 uneven parts, 36, 46 Center hole, 40 Fixing member, 42 Flange, 46 Gap, 50, 60 Refrigerant, 52 Radial flow.

Claims (3)

A core portion attached to the rotor shaft;
An end plate that has a plurality of recesses or projections extending radially in the radial direction on the end surface opposite to the core surface facing the core portion, and is disposed at the axial end of the core portion;
The end surface facing the end plate is opposed to engage with the plurality of recesses or projections of the end plate, and has a plurality of projections or recesses extending radially in the radial direction, arranged at the end of the end plate in the axial direction. A fixing member that is fixed to the rotor shaft,
A rotating electrical machine rotor comprising: In the rotating electrical machine rotor according to claim 1,
The plurality of concave portions or convex portions of the end plate have an inclined mountain shape having an inclined surface along the circumferential direction or an inclined valley shape,
The plurality of concave portions or convex portions of the fixing member has an inclined valley shape having an inclined surface or an inclined mountain shape along the circumferential direction, and the rotating electric machine rotor. The rotating electrical machine rotor according to claim 2,
A rotor shaft provided with a discharge port through which the refrigerant is discharged from a refrigerant passage provided inside along the axial direction toward a facing surface where the end plate and the fixing member face each other,
At least one of the end plate or the fixing member lacks at least one of a plurality of concave portions or convex portions, thereby forming a gap through which the refrigerant from the discharge port circulates on the meshing surface between the end plate and the fixing member. A rotating electric machine rotor characterized by being made.

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