JP2010142080A - Axial gap type rotary electric machine - Google Patents

Abstract

An object of the present invention is to provide an axial gap type rotating electrical machine having a stator that can be held on a frame without reducing the strength of a field part.
An axial gap type rotating electrical machine 3 according to an embodiment of the present invention includes a rotor 30 and a stator 10 disposed opposite to the rotor 30 with a gap in the direction of the rotating shaft 4. With. The rotor 30 is annularly arranged around the rotation axis 4 along the circumferential direction, is spaced apart from each other along the circumferential direction, and rotates with a plurality of field portions 31 that have different polarities in a predetermined direction. The magnetic body 300 provided with the position in the circumferential direction around the shaft avoiding the magnetic pole surface is hooked on one side in the axial direction of the field magnet portion 31 and part on the other side in the axial direction of the magnetic body 300 is hooked. And a plate 38 that sandwiches the field portion 31 together with the frame 35 in the axial direction and is joined to the other portion of the other side of the magnetic body 300.
[Selection] Figure 1

Description

  The present invention relates to an axial gap type rotating electrical machine.

  An axial gap type rotating electrical machine is a rotating electrical machine including a rotor and stators disposed on both sides of the rotor in the rotation axis direction via air gaps. This axial gap type rotating electrical machine is preferable to rotating electrical machines of other structures in that the structure can be reduced in thickness and the torque density can be improved by increasing the magnetic pole area.

  The technologies related to this axial gap type rotating electrical machine are disclosed in Patent Documents 1 to 4.

JP 2007-89270 A JP 2001-136721 A JP 2001-46285 A JP-A-2-262863

  In a rotor, it is necessary to hold | maintain the magnet arrange | positioned cyclically | annularly along the circumferential direction of a rotating shaft, and the magnetic body board provided in the at least one surface of the said magnet. In particular, in the rotor described in Patent Document 2, a step is provided at the ends of the magnet and the magnetic plate arranged annularly along the circumferential direction of the rotation shaft, and the step and the frame separated into two in the axial direction. The magnet and the magnetic plate are sandwiched between the two frames by fitting each of them. Moreover, in patent document 4, it hold | maintains by welding a magnetic body board and a flame | frame.

  However, in the magnet and magnetic plate of Patent Document 2, it is necessary to provide steps at both ends with respect to the rotation axis direction, so the thickness of the magnet and magnetic plate provided with the steps is reduced and the strength is increased. There was a problem of lowering. Moreover, when welding a magnetic body plate and a flame | frame like patent document 4, two welding processes which weld the surface and frame of a magnetic body board of both sides with respect to a rotating shaft direction are needed, and a manufacturing process increases. There is a problem. Furthermore, the magnetic plate laminated on the magnet is deteriorated in magnetic properties by being welded, and the magnet may lose its magnetism due to heat.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an axial gap type rotating electrical machine having a stator that can be held on a frame without reducing the strength of field portions (magnets and magnetic plates).

  In order to solve the above-mentioned problems, an axial gap type rotating electrical machine according to the present invention has a rotor disposed so as to be rotatable about a rotation axis, and a gap in an axial direction corresponding to the direction of the rotation axis, and faces the rotor. And an arranged stator. The rotor is annularly arranged along the circumferential direction around the rotation axis, is spaced apart from each other along the circumferential direction, and rotates with a plurality of field portions having magnetic pole faces that exhibit different polarities in the axial direction. A magnetic body whose position in the circumferential direction about the shaft is provided avoiding the magnetic pole surface, and a frame that hooks one side of the magnetic field portion in the axial direction and hooks a part of the other side in the axial direction of the magnetic body; And a plate that sandwiches the field part together with the frame in the axial direction and is joined to the other part on the other side of the magnetic body.

  The magnetic body and the plate may be joined by laser welding.

  In order to solve the above-mentioned problem, an axial gap type rotating electrical machine according to another invention rotates with a rotor arranged rotatably around a rotation axis and a gap in the axial direction of the rotation axis. And a stator disposed opposite to the child. The rotor is annularly arranged along the circumferential direction around the rotation axis, is separated from each other along the circumferential direction, and each of the field portions has different polarities in the axial direction, and the axis of the field portion A frame having a latching portion that latches one side in the direction, a projection protruding to the other side in the axial direction, and a plate that clamps the field portion together with the frame by joining the projection.

  The plate may have a recess or a through hole into which the protrusion is inserted.

  In order to solve the above-mentioned problem, an axial gap type rotating electrical machine according to another invention rotates with a rotor arranged rotatably around a rotation axis and a gap in the axial direction of the rotation axis. And a stator disposed opposite to the child. The rotor is annularly arranged along the circumferential direction around the rotation axis, is separated from each other along the circumferential direction, and each of the field portions has different polarities in the axial direction, and the axis of the field portion A frame having a latching part for latching one side in the direction, an outer diameter part provided on the outer peripheral side of the field part, a bottom disposed on the other side in the axial direction of the field part, and an outside of the frame A plate having a side surface covering the outer peripheral side of the diameter portion and formed into a cup shape and joined to a frame.

  Moreover, you may join a flame | frame and a board | plate by hooking the edge part of the one side of a board to a part of one side of the outer diameter part of a flame | frame.

  The plate may have conductivity and may have a surface provided with a slit on the other side of the field part.

  The plate may be a soft magnetic material.

  According to this axial gap type rotating electrical machine, the frame is held from one side in the axial direction, and the plate from the other side holds the field part, so a structure that reduces the strength of the field part is adopted for the field part. Can be held in the frame without Further, by further including the magnetic plate, the magnetic plate has a function of increasing the q-axis inductance, and contributes to holding the field portion through the frame.

  Also, by joining the magnetic plate and the plate by laser welding, the welded portion can be made smaller with less heat input, and the joining strength between the magnetic plate and the plate can be increased without protruding the welded portion from the air gap surface. .

  In addition, according to another axial gap type rotating electrical machine, it can be held on the frame without lowering the strength of the field part.

  In addition, the plate and the frame can be joined by a simple operation of crushing the protrusion inserted into the hole provided in the plate or the end of the protrusion exposed through the recess provided in the plate, reducing the production process. can do.

  In addition, according to another axial gap type rotating electrical machine, the cup-shaped plate holds the field portion from both sides in the axial direction via the frame, so that the strength of the field portion is reduced only by processing the plate. The structure can be held on the frame without adopting the field part.

  Also, by joining the end of the cup-shaped plate to a part of the outer peripheral portion of the frame and joining the frame and the plate, it is possible to join by simple work and reduce the production process. .

  Further, by providing the plate with a slit in the surface in the direction of the rotation axis, eddy current loss due to a change in magnetic flux passing through the plate can be reduced.

  Further, it is possible to reduce the difference in thrust force between the stators on both sides when the winding is provided only on one stator.

(Embodiment 1)
FIGS. 1A and 1B respectively show an exploded perspective view and a completed perspective view of a rotor 30 of an axial gap motor according to Embodiment 1 of the present invention. The rotor 30 includes a field portion 31, a non-magnetic metal frame 35, a short-circuit steel plate 38 made of one electromagnetic steel plate, and a magnetic body 300, and can rotate around a rotation shaft (not shown). It is. The magnetic body 300 has a T-shaped cross section viewed from a direction perpendicular to the rotation axis direction (hereinafter also simply referred to as the axial direction). The magnetic body 300 is provided at a position in the circumferential direction with respect to the rotation axis so as to avoid the field portion 31 (especially, a magnetic pole surface described later), and contributes to reluctance torque by increasing so-called q-axis inductance. The frame 35 is provided with six inner diameter portions 35a and outer diameter portions 35b and six spokes 36 connecting the two. The spokes 36 are provided with holes 36a capable of hooking the magnetic body 300 in the radial direction, and apparently there are twelve spokes 36. FIG. 1A shows the rotor 30 shown in FIG. 1B by shifting the constituent elements of the field magnet portion 31, the frame 35, the short-circuit steel plate 38, and the magnetic body 300 along the rotation axis. Yes. The magnetic body 300 is preferably a magnetic steel sheet laminated in the radial direction. This is because welding is possible. If welding is not performed, a dust core may be used.

  Next, FIG. 2 shows a cross-sectional view of an axial gap type motor according to the present embodiment that employs the rotor 30 shown in FIG. An axial gap type motor 3 shown in FIG. 2 includes a rotor 30 fixed to a rotating shaft 4, a first stator 10 opposed to the upper side of the rotor 30 in the axial direction via an air gap, and a lower side of the rotor 30 in the axial direction. And a second stator 21 facing each other through an air gap. That is, the axial gap type motor 3 has a configuration in which the rotor 30 is sandwiched between the first stator 10 and the second stator 21 from both axial sides. In addition, in the center part of the 1st stator 10 and the 2nd stator 21, the rotating shaft 4 has penetrated rotatably. The first stator 10 and the second stator 21 are held by pipes whose outer periphery forms part of the container. In the figure, a part of the pipe is shown.

  The first stator 10 includes a back yoke 11, teeth 12 standing on the rotor 30 side of the back yoke 11, and a coil 13 wound around the teeth 12. The back yoke 11 has a disk shape. The coil 13 is a three-phase coil. The second stator may be provided with a three-phase coil.

  The rotor 30 according to the present embodiment employs a short-circuit steel plate 38. The short-circuit steel plate 38 ensures the function of partially shorting the magnetic flux on the second stator 21 side of the field part and the function of holding the field part 31 described later. When the magnetic attraction force acting between the second stator 21 and the rotor 30 is stronger than the magnetic attraction force acting between the first stator 10 and the rotor 30 due to the former function, the second stator 21 and the rotor 30 Decrease the magnetic attraction that works during the period. Although the latter function will be described later, from this point of view, a non-magnetic material or a non-metallic plate can be adopted instead of the short-circuit steel plate 38.

  Next, the rotor 30 of the axial gap type motor according to the present embodiment will be described in detail. A field portion 31 shown in FIG. 1A includes a magnet 32 and a magnetic plate 33 that is a magnetic core that is laminated on the magnet 32 in the axial direction. The magnet 32 has a first magnetic pole surface and a second magnetic pole surface that have different polarities on both sides in the axial direction. For example, the first magnetic pole surface exhibits an N pole, and the second magnetic pole surface exhibits an S pole.

  It is desirable to employ a sintered rare earth magnet for the magnet 32 in order to increase the magnetic flux density. In this case, rare earth magnets, particularly sintered magnets, have high electrical conductivity, and eddy current loss is likely to occur due to the rotating magnetic field generated from the first stator 10. Therefore, by using a magnetic material having a lower conductivity than the rare earth magnet for the magnetic plate 33 and providing it on the first stator 10 side with respect to the magnet 32, the generation of eddy current loss can be suppressed. In particular, eddy current loss due to a change in magnetic flux of a carrier component in PWM control can be reduced. By adopting a magnetic core that is magnetically isotropic to the magnetic plate 33, eddy current loss can hardly occur in the magnetic plate 33. On the other hand, since most of the field magnetic flux generated by the magnet 32 on the first stator 10 side passes through the magnetic plate 33, the surface on the first stator 10 side of the magnetic plate 33 is substantially the field portion 31. It functions as a magnetic pole surface.

  For example, the magnetic plate 33 may be fixed to the magnet 32 using an adhesive or the like.

  Next, the structure in which the rotor 30 according to the present embodiment holds the field magnet portion 31 will be described. FIG. 3A is a perspective view of the rotor 30 according to the present embodiment as viewed from the short-circuit steel plate 38 side. FIG. 3B is a perspective view showing a cross section of the rotor 30 shown in FIG. FIG. 3C shows a cross-sectional view at position BB in FIG. First, as shown in FIG. 3B, a flange portion 301 is provided on the inner diameter portion 35a and / or the outer diameter portion 35b of the frame 35. The actual brim portion 301 may be thin as long as strength is ensured. The flange portion 301 hooks the end portions on the inner peripheral side and / or outer peripheral side of each field portion 31 on one side in the axial direction (the magnetic plate 33 side: the upper side in the drawing), and the armature magnetic flux. It has the effect of increasing q-axis inductance by being guided to the magnetic body 300. Specifically, the brim portion 301 hooks one side of the magnetic plate 33. In FIG. 3B, no step is provided at the position of the magnetic body plate 33 where the flange portion 301 is hooked. However, the present invention is not limited to this, and a step or inclination is provided at the position of the magnetic body plate 33 only on the side that is hooked with the flange portion 301, and the step or inclination of the flange portion 301 and the magnetic body plate 33 is fitted. It may be configured. In addition, the flange part 301 can prevent leakage magnetic flux by keeping a certain distance from the magnetic body plate 33.

  Furthermore, as shown in FIG. 1A and FIG. 3C, the rotor 30 according to the present embodiment engages the holes 36 a provided in the spokes 36 so that the magnetic body 300 A part of the other side in the axial direction is hooked on the frame 35. Specifically, the other surface 300 a of the magnetic body 300 extending in a direction orthogonal to the axial direction is hooked on the spoke 36. A part of the other side of the magnetic body 300 is joined to the short-circuit steel plate 38. Specifically, the other surface 300 b of the magnetic body 300 in the portion extending in the axial direction is joined to the short-circuit steel plate 38. As a specific joining method, as shown by a laser welding mark 307 in FIG. 3A, a method of laser welding the short-circuit steel plate 38 and the magnetic body 300 (particularly, the surface 300b) can be considered. This is because the number of parts is small and the bonding strength is high. In addition, about the joining method, this invention is not restricted to this, You may utilize methods, such as an adhesive agent and screwing.

  The rotor 30 according to the present embodiment joins the short-circuit steel plate 38 and the magnetic body 300 so that the field portion 31 is the flange portion 301 of the frame 35 from one side in the axial direction and the short-circuit steel plate from the other side. At 38, the field portion 31 can be sandwiched. The field portion 31 is held by the inner diameter portion 35a and the outer diameter portion 35b of the frame 35 in the radial direction and the spoke 36 of the frame 35 in the circumferential direction.

  As described above, the rotor 30 according to the present embodiment joins the magnetic body 300 and the short-circuit steel plate 38 that are hooked in the holes 36 a provided in the spoke 36, so that the boundary between the frame 35 and the short-circuit steel plate 38 is obtained. Since the magnetic part 31 is sandwiched, it is not necessary to provide steps at both ends of the field part 31 in the axial direction, and the magnetic part 31 can be held on the frame 35 without reducing the strength of the field part 31. In the rotor according to the present embodiment, the magnetic body 300 is hooked in the hole 36 a provided in the spoke 36, but the present invention is not limited to this, and the magnetic body 300 is attached to any part of the frame 35. Just hook it up. When the magnetic body 300 is hooked in the hole 36a provided in the spoke 36 as in the rotor according to the present embodiment, there is an effect that the magnetic body 300 can be arranged without reducing the area in which the field portion 31 is provided. ing.

  From the viewpoint of holding such a field portion 31, the short-circuit steel plate 38 does not need to short-circuit the magnetic flux on the second stator 21 side of the field portion 31, and does not need to be a magnetic body. When the second stator 21 functions as an armature similarly to the first stator 10, the short-circuit steel plate 38 is rather a non-magnetic material in order to efficiently link the field magnetic flux to the second stator 21. In order to reduce eddy currents caused by the rotating magnetic field generated by the second stator 21, it is preferable that the second stator 21 be non-metallic. Moreover, the short-circuit steel plate 38 does not need to be connected in the circumferential direction from the viewpoint of fulfilling the function of supporting the field portion 31 from the other side, and is divided into a plurality of parts other than the position where the magnetic body 300 is joined. Also good. Of course, it is desirable that the part expands in the circumferential direction to the extent that the field portion 31 can be supported. However, when using laser welding, a stainless steel plate (non-magnetic) is desirable.

  Further, in the rotor 30 according to the present embodiment, the magnetic body 300 having a T-shaped cross section in the rotation axis direction is adopted, but the present invention is not limited to this, and the shape that can be hooked on the other side with respect to the frame 35 Any shape is acceptable. Further, the magnetic body 300 is joined to the short-circuit steel plate 38 (although it is not necessarily a steel plate as described above), and in view of the function of indirectly holding the field portion 31 via the frame 35, It may be non-magnetic. Of course, in this case, an increase in q-axis inductance is not expected.

(Embodiment 2)
FIG. 4 shows an exploded perspective view of the rotor 30 according to the present embodiment. The rotor 30 shown in FIG. 4 includes a field magnet portion 31, a frame 35, and a short-circuit steel plate 38, and is rotatable about a rotation shaft (not shown). Here, the frame 35 shown in FIG. 4 is provided with an inner diameter portion 35a, an outer diameter portion 35b, and six spokes 36 connecting the two. Note that FIG. 4 shows the components of the field magnet portion 31, the frame 35, and the short-circuit steel plate 38 shifted along the rotation axis. Next, the sectional view of the axial gap type motor according to the present embodiment employing the rotor 30 shown in FIG. 4 is basically the same as FIG.

  Next, the field portion 31 shown in FIG. 4 includes a magnet 32 and a magnetic plate 33 that is a magnetic core that is laminated in the axial direction with respect to the magnet 32. The configurations of the magnet 32 and the magnetic plate 33 are the same as the configurations of the magnet 32 and the magnetic plate 33 described in the first embodiment, and thus detailed description thereof is omitted.

  In the rotor 30 according to the present embodiment, as shown in FIG. 4, the flange portion 301 provided on the inner diameter portion 35a and / or the outer diameter portion 35b of the frame 35 has one side in the axial direction of each field portion 31 (in the drawing, And the field magnet portions 31 are held from one side in the axial direction. On the other hand, the short-circuit steel plate 38 shown in FIG. 4 holds each field part 31 from the other side in the axial direction (lower side in the figure). That is, the rotor 30 shown in FIG. 4 sandwiches the field portion 31 between the flange portion 301 of the frame 35 and the short-circuit steel plate 38. In the present embodiment, the frame 35 and the short-circuit steel plate 38 are joined. As shown in FIG. 4, the frame 35 is provided with a protrusion 308 that protrudes to the other side in the axial direction. Further, the short-circuit steel plate 38 is provided with a hole 309 at a position where it is fitted to the protrusion 308. The joining of the frame 35 and the short-circuit steel plate 38 is realized by fitting the projection 308 and the hole 309 and bending or crushing the projection 308. If the holding strength can be obtained simply by fitting the protrusion 308 provided on the frame 35 and the hole 309 provided in the short-circuit steel plate 38, the protrusion 308 need not be bent or crushed. In addition, the hole 309 is not necessarily provided in the short-circuit steel plate 38 and may be a recess that fits into the protrusion 308. The recess may have a configuration in which the protrusion 308 penetrates to become a hole and the protrusion 308 is exposed by fitting with the protrusion 308.

  Further, a joining method in which the protrusion 308 provided in the frame 35 and the hole 309 provided in the short-circuit steel plate 38 are fitted to each other and the protrusion 308 is crushed will be described in detail. 5A and 5B are cross-sectional views of the rotor 30 shown in FIG. 4 cut along a CC plane. 5A is a cross-sectional view of the rotor 30 before the protrusions 308 are crushed, and FIG. 5B is a cross-sectional view of the rotor 30 after the protrusions 308 are crushed. In the rotor 30 shown in FIG. 5A, the projections 308 provided in the frame 35 and the holes 309 provided in the short-circuit steel plate 38 are fitted, and the field portions 301 and the short-circuit steel plate 38 of the frame 35 are connected to each field. The part 31 is clamped. The field portion 31 is held by the inner diameter portion 35a and the outer diameter portion 35b of the frame 35 in the radial direction and the spoke 36 of the frame 35 in the circumferential direction. Therefore, the radial position of the protrusion 308 is different from that of the field part 31, and the protrusion 308 does not contact the field part 31.

  Next, the protruding portion 308 becomes a protruding portion 308a that is crushed as shown in FIG. 5B and expands in a direction perpendicular to the axial direction. By forming the projections 308a in this way, the frame 35 and the short-circuit steel plate 38 are strongly joined. The protrusion 308a is provided at a position not facing the armature magnetic core.

  As described above, in the rotor 30 according to the present embodiment, the field portion 31 is sandwiched between the frame 35 and the short-circuit steel plate 38 by joining the protrusion 308 provided on the frame 35 and the short-circuit steel plate 38. Therefore, it is not necessary to provide steps at both ends of the field portion 31 in the axial direction, and the field portion 31 can be held on the frame 35 without reducing the strength. In the present embodiment, similarly to the first embodiment, a nonmagnetic and / or nonmetallic plate may be employed instead of the short-circuited steel plate 38.

(Embodiment 3)
FIG. 6 shows an exploded perspective view of the rotor 30 according to the present embodiment. The rotor 30 shown in FIG. 6 includes a field magnet portion 31, a frame 35, and a short-circuit steel plate 38, and is rotatable about a rotation shaft (not shown). Here, the frame 35 shown in FIG. 6 is provided with an inner diameter portion 35a, an outer diameter portion 35b, and six spokes 36 connecting the two. Moreover, the short-circuit steel plate 38 is a cup shape provided with a bottom part (in FIG. 6, the hole for passing a rotating shaft is provided) and a side part. FIG. 6 shows the components of the field magnet portion 31, the frame 35, and the short-circuit steel plate 38 shifted along the rotation axis. Next, the sectional view of the axial gap type motor according to the present embodiment employing the rotor 30 shown in FIG. 6 is basically the same as FIG.

  Next, the field portion 31 shown in FIG. 6 includes a magnet 32 and a magnetic plate 33 that is a magnetic core that is laminated in the axial direction with respect to the magnet 32. The configurations of the magnet 32 and the magnetic plate 33 are the same as the configurations of the magnet 32 and the magnetic plate 33 described in the first embodiment, and thus detailed description thereof is omitted.

  In the rotor 30 according to the present embodiment, as shown in FIG. 6, the flange portion 301 provided on the inner diameter portion 35a and / or the outer diameter portion 35b of the frame 35 has one side in the axial direction of each field portion 31 (in the drawing, And the field portion 31 is held from one side in the axial direction. On the other hand, the short-circuited steel plate 38 shown in FIG. 6 has a bottom 38b disposed on the other side (lower side in the drawing) of the field portion 31 and a side surface 38a covering the outer peripheral side of the outer diameter portion 35b. . That is, in the rotor 30 shown in FIG. 6, the cup-shaped short-circuited steel plate 38 is sandwiched between the flange portion 301 of the frame 35 and the short-circuited steel plate 38 while the cup-shaped short-circuited steel plate 38 is on the other side in the axial direction of the frame 35. It is the structure which covers.

  Further, a method for joining the frame 35 and the short-circuit steel plate 38 will be described in detail. FIG. 7 shows a cross-sectional view of the rotor 30 shown in FIG. 6 cut along a DD plane. In the rotor 30 shown in FIG. 7, each field portion 31 is held from one side in the axial direction by the flange portion 301, and the short-circuit steel plate 38 holds each field portion 31 from the other side in the axial direction, thereby the frame 35. And the short-circuit steel plate 38 sandwich the field portions 31. The field portion 31 is held by the inner diameter portion 35a and the outer diameter portion 35b of the frame 35 in the radial direction and the spoke 36 of the frame 35 in the circumferential direction.

  In the rotor 30 shown in FIG. 7, the side surface 38 b of the short-circuit steel plate 38 covers the outer peripheral side surface of the outer diameter portion 35 b of the frame 35, and the end portion 310 of the short-circuit steel plate 38 is disposed on one side in the axial direction of the frame 35. The frame 35 and the short-circuit steel plate 38 are joined by being hooked on the surface. In the rotor 30 shown in FIG. 7, the end 310 of the short-circuit steel plate 38 is bent to be hooked on one side in the axial direction of the frame 35, but the present invention is not limited to this, and the frame 35 and the cup shape For example, if the holding strength is obtained by the frictional force in the shearing direction between the outer diameter portion 35b and the side surface 38b only by fitting the short-circuit steel plate 38, the end portion 310 of the short-circuit steel plate 38 is bent to the frame 35. There is no need to hang. Further, the hooking position of the end 310 of the short-circuit steel plate 38 is not limited to the upper surface in the axial direction of the frame 35, and may be any position on the side surface of the outer peripheral portion of the frame 35.

  As described above, in the rotor 30 according to the present embodiment, the field portion 31 is sandwiched between the frame 35 and the cup-shaped short-circuited steel plate 38, so that steps are provided at both ends in the axial direction of the field portion 31. This is not necessary and can be held on the frame 35 without reducing the strength of the field portion 31. In the present embodiment, similarly to the first embodiment, a non-magnetic and / or non-metallic cup-shaped plate may be adopted instead of the short-circuited steel plate 38.

(Embodiment 4)
FIG. 8 is an exploded perspective view of the rotor 30 according to the present embodiment. The rotor 30 shown in FIG. 8 includes a field portion 31, a frame 35, a short-circuit steel plate 38, and a pipe portion 311, and is rotatable around a rotation shaft (not shown). Here, the frame 35 shown in FIG. 8 is provided with six inner diameter portions 35a and outer diameter portions 35b, and six spokes 36 connecting these two. The pipe portion 311 covers the outer peripheral side surface of the outer diameter portion 35 b of the frame 35 and the outer peripheral side surface of the short-circuit steel plate 38. FIG. 8 shows the constituent elements of the field magnet portion 31, the frame 35, the short-circuit steel plate 38, and the pipe portion 311 shifted along the rotation axis. Next, the sectional view of the axial gap type motor according to the present embodiment employing the rotor 30 shown in FIG. 8 is basically the same as FIG.

  Next, the field magnet portion 31 shown in FIG. 8 includes a magnet 32 and a magnetic plate 33 that is a magnetic core that is laminated on the magnet 32 in the axial direction. The configurations of the magnet 32 and the magnetic plate 33 are the same as the configurations of the magnet 32 and the magnetic plate 33 described in the first embodiment, and thus detailed description thereof is omitted.

  In the rotor 30 according to the present embodiment, as shown in FIG. 8, the flange portion 301 provided on the inner diameter portion 35 a and / or the outer diameter portion 35 b of the frame 35 is locked to one side in the axial direction of each field portion 31. Each field part 31 is held from one side (the upper side in the drawing). On the other hand, the short-circuit steel plate 38 shown in FIG. 8 holds each field part 31 from the other side (lower side in the drawing) in the axial direction. Further, the frame 35 and the short-circuit steel plate 38 are joined using the pipe portion 311. That is, the rotor 30 shown in FIG. 8 sandwiches the field portion 31 between the frame 35 joined by the pipe portion 311 and the short-circuit steel plate 38. The field portion 31 is held by the inner diameter portion 35a and the outer diameter portion 35b of the frame 35 in the radial direction and the spoke 36 of the frame 35 in the circumferential direction.

  Further, a method for joining the frame 35 and the short-circuit steel plate 38 will be described in detail. FIG. 9 shows a cross-sectional view of the rotor 30 shown in FIG. 8 cut along the EE plane. In the rotor 30 shown in FIG. 9, the pipe portion 311 is fitted so as to cover the outer peripheral side surface of the outer diameter portion 35 b of the frame 35 and the outer peripheral side surface of the short-circuit steel plate 38, and the axial end portion 312 of the pipe portion 31. The frame 35 and the short-circuit steel plate 38 are hooked on the surface on one side (upper side in the drawing) of the frame 35 and the surface on the other side (lower side in the drawing) of the short-circuit steel plate 38. It is joined.

  In the rotor 30 shown in FIG. 9, the end 312 of the pipe portion 31 is bent to be hooked to the frame 35 and the short-circuit steel plate 38, but the present invention is not limited to this, and the frame 35 and the short-circuit steel plate 38 If the holding strength is obtained only by fitting the pipe part 311 by, for example, the frictional force in the shearing direction between the outer diameter part 35b and the pipe 311, the end part 312 of the pipe part 311 is bent and the frame 35 and the short circuit are connected. There is no need to hook the steel plate 38. Further, the latching position of the end portion 312 of the pipe portion 311 is not limited to the axially upper surface of the frame 35 and the axially lower surface of the short-circuit steel plate 38. For example, as shown in FIG. 10, a hook portion 312 a is provided on each of the outer peripheral side surface of the outer diameter portion 35 b of the frame 35 and the outer peripheral side surface of the short-circuit steel plate 38, and the end of the hook portion 312 a and the pipe portion 311 is provided. The part 312 may be latched, and the axial direction of the pipe part 311 may be fixed from both sides by the latching part 312a. 10 is a cross-sectional view of a portion where the end portion 312 of the pipe portion 311 is hooked to the hook portion 312a of the frame 35 and the short-circuit steel plate 38. Furthermore, in this invention, you may join the flame | frame 35 and the short circuit steel plate 38, and the pipe part 311 with an adhesive agent or welding. That is, other joining methods may be used in combination.

  As described above, the rotor 30 according to the present embodiment has the field portion 31 sandwiched between the frame 35 joined by the pipe portion 311 and the short-circuit steel plate 38, so that both ends of the field portion 31 in the axial direction are sandwiched. There is no need to provide a step in the frame 35 and the frame 35 can be held without reducing the strength of the field portion 31. In the present embodiment, a nonmagnetic and / or nonmetallic plate may be adopted instead of the short-circuited steel plate 38 as in the first embodiment.

  Next, a modified example of the short-circuit steel plate 38 described in the first to fourth embodiments will be described. The short-circuit steel plate 38 shown in FIG. 8 has no dents or holes other than providing holes at positions corresponding to the rotation axis. On the other hand, in this modification, a plurality of slits 313 are provided along the circumferential direction as in the short-circuited steel plate 38 shown in FIG. The slit 313 passes through the short-circuit steel plate 38. Since the magnetic flux flows along the circumferential direction of the short-circuited steel plate 38, by providing the slit 313 as shown in FIG. 11, the portion where the magnetic flux flows is reduced, and the amount of magnetic flux leakage is adjusted by changing the flow of the magnetic flux. can do. In order to further change the flow of the magnetic flux, the slit 313 may be provided in the short-circuit steel plate 38 so that the portion 313a between the slits 313 adjacent in the circumferential direction is located at the pole center of the field magnet portion 31. Moreover, the eddy current loss which arises in a short circuit steel plate can also be reduced.

  Further, it is conceivable that the permeance of the short-circuited steel plate 38 is lowered by providing the slit 313 in the short-circuited steel plate 38. Therefore, like the short-circuited steel plate 38 shown in FIG. 12, the magnetic material plate 314 not provided with the slit and the plate provided with the slit 313 are overlapped to form a magnetic flux without reducing the permeance of the short-circuited steel plate 38. The amount of leakage can be reduced. Note that the configuration of the short-circuit steel plate 38 is not limited to a configuration in which a plate having the slit 313 and a plate having no slit 313 are overlapped as shown in FIG. 12, and a single plate penetrates to a position corresponding to the slit 313. The structure which forms the groove | channel which does not perform may be sufficient.

  As another modification, a short-circuit steel plate 38 is shown in FIG. The short-circuit steel plate 38 shown in FIG. 13 is provided with slits 315 not in the circumferential direction but in the radial direction. The slit 315 passes through the short-circuit steel plate 38. The slit 315 is disposed on the short-circuited steel plate 38 so as to be positioned between the poles of the field part 31. By providing the slits 315 between the poles of the field part 31 in this way, the amount of short circuit between the poles can be reduced and the amount of leakage of magnetic flux can be adjusted. The slits 313 shown in FIGS. 11 and 12 are provided to control the flow of magnetic flux, so that the field portion 31 adjacent from the pole center of a certain field portion 31 along the flow of magnetic flux. Between the pole centers. On the other hand, since the slit 315 shown in FIG. 13 is provided to control the amount of short circuit between the poles, it is provided between the poles of the field part 31 in which a short circuit occurs.

  In addition, although the groove | channel 313 shown in FIG. 11 and the slit 315 shown in FIG. 13 were demonstrated separately, in the rotor 30 which the axial gap type motor which concerns on this invention employ | adopts, the slit 313 and the slit 315 are formed on the same short-circuit steel plate 38. May be formed together.

It is the disassembled perspective view and completed perspective view of the rotor used for the axial gap type motor which concerns on Embodiment 1 of this invention. It is sectional drawing of the axial gap type motor which concerns on Embodiment 1 of this invention. It is the perspective view and sectional drawing of a rotor which are used for the axial gap type motor which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the rotor used for the axial gap type motor which concerns on Embodiment 2 of this invention. It is sectional drawing of the rotor used for the axial gap type motor which concerns on Embodiment 2 of this invention. It is a disassembled perspective view of the rotor used for the axial gap type motor which concerns on Embodiment 3 of this invention. It is sectional drawing of the rotor used for the axial gap type motor which concerns on Embodiment 3 of this invention. It is a disassembled perspective view of the rotor used for the axial gap type motor which concerns on Embodiment 4 of this invention. It is sectional drawing of the rotor used for the axial gap type motor which concerns on Embodiment 4 of this invention. It is sectional drawing of a part of rotor used for the axial gap type motor which concerns on Embodiment 4 of this invention. It is a perspective view of the short circuit steel plate of the rotor used for the axial gap type motor which concerns on Embodiment 1 thru | or 4 of this invention. It is a perspective view of the short circuit steel plate of the rotor used for the axial gap type motor which concerns on Embodiment 1 thru | or 4 of this invention. It is a perspective view of the short circuit steel plate of the rotor used for the axial gap type motor which concerns on Embodiment 1 thru | or 4 of this invention.

Explanation of symbols

3 Axial Gap Type Motor 4 Rotating Shaft 10 First Stator 11, 21 Back Yoke 12 Teeth 13 Coil 30 Rotor 31 Field Magnet Section 32 Magnet 33 Magnetic Material Plate 35 Frame 36 Spoke 38 Short-circuit Steel Plate 300 Magnetic Material 301 Head 308 Projection 309 Hole 310 End 311 of short-circuit steel plate Pipe portion 312 End portion 313, 315 of pipe portion Groove 314 Plate

Claims (8)

A rotor (30) arranged rotatably around a rotation axis, and a stator (10, 10) arranged opposite to the rotor (30) with a gap in the axial direction corresponding to the direction of the rotation axis. 20) an axial gap type rotating electrical machine comprising:
The rotor (30)
A plurality of field portions (31) arranged in an annular shape around the rotation axis in a circumferential direction, spaced apart from each other along the circumferential direction, and having magnetic pole faces each having a different polarity in the axial direction; ,
A magnetic body (300) provided so that a position in a circumferential direction about the rotation axis avoids the magnetic pole surface;
A frame (35) that latches one side of the field portion (31) in the axial direction and a part (300a) of the other side of the magnetic body in the axial direction;
An axial gap type rotating electric machine having a plate (38) that is sandwiched in the axial direction together with the frame (35) in the axial direction and joined to the other part (300b) on the other side of the magnetic body. . The axial gap type rotating electrical machine according to claim 1,
The magnetic body (300) and the plate (38) are joined by laser welding (307). A rotor (30) arranged rotatably around a rotation axis, and a stator (10, 10) arranged opposite to the rotor (30) with a gap in the axial direction corresponding to the direction of the rotation axis. 20) an axial gap type rotating electrical machine comprising:
The rotor (30)
A plurality of field portions (31) arranged annularly along the circumferential direction around the rotation axis, spaced apart from each other along the circumferential direction, and all exhibiting different polarities in the axial direction;
A frame (35) having a hooking portion (301) for hooking one side of the axial direction of the field portion (31) and a protrusion (308) protruding to the other side with respect to the axial direction;
An axial gap type rotating electrical machine having a plate (38) that sandwiches the field portion (31) together with the frame (35) by joining to the protrusion (308). An axial gap type rotating electrical machine according to claim 3,
The axial gap type rotating electrical machine, wherein the plate (38) has a recess or a through hole into which the protrusion (308) is inserted. A rotor (30) arranged rotatably around a rotation axis, and a stator (10, 10) arranged opposite to the rotor (30) with a gap in the axial direction corresponding to the direction of the rotation axis. 20) an axial gap type rotating electrical machine comprising:
The rotor (30)
A plurality of field portions (31) arranged annularly along the circumferential direction around the rotation axis, spaced apart from each other along the circumferential direction, and all exhibiting different polarities in the axial direction;
A frame (35) having a hooking portion (301) for hooking one side of the field portion (31) in the axial direction and an outer diameter portion (35b) provided on the outer peripheral side of the field portion; ,
The bottom portion (38b) disposed on the other side in the axial direction of the field portion (31) and the side surface (38a) covering the outer peripheral side of the outer diameter portion of the frame are formed into a cup shape. An axial gap type rotating electrical machine having a plate (38) joined to the frame. An axial gap type rotating electrical machine according to claim 5,
The one end portion (310) of the plate (38) is hooked to a part of the one side of the outer diameter portion (35b) of the frame (35). An axial gap type rotating electrical machine characterized by joining a plate (38). An axial gap type rotating electrical machine according to any one of claims 1 to 6,
The plate (38) is conductive and has an axial gap type rotating electrical machine having a surface provided with slits (309, 311) on the other side of the field portion. An axial gap type rotating electrical machine according to any one of claims 1 to 7,
The said plate (38) consists of a soft magnetic body, The axial gap type rotary electric machine characterized by the above-mentioned.

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