JP2008182786A - Rotor and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor which effectively forms magnetic flux while surely fixing segment magnets to a rotating shaft, and prevents the breakage of the segment magnets, and also to provide a rotating electric machine. <P>SOLUTION: In the rotor 10 in which a plurality of the segment magnets 13 is circumferentially arranged in the external periphery of the rotatably-supported rotating shaft 11 in parallel therewith via a holding member 12, the holding member 12 is constituted of a substantially-cylindrical holding member body 22, and a plurality of protrusions 23 formed in the holding member body 22 toward the outside of the radial direction, an insertion groove 26 into which the segment magnets 13 can be fixedly inserted along the axial direction, is formed of the holding member body 22 and the protrusions 23, and the segment magnets 13 are formed so as to correspond to the insertion groove 26. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotor using segment magnets and a rotating electrical machine having a rotor and a stator.

  In general, a rotating electrical machine is composed of a stator around which a coil is wound, and a rotor that is rotatably provided to the stator. The rotor includes a rotating shaft that is rotatably supported, a substantially cylindrical rotor core that is externally fixed to the outer periphery of the rotating shaft, and a magnet that is attached to the outer periphery of the rotor core. As the magnet, a ring magnet formed in a substantially cylindrical shape and a tile-shaped segment magnet that is long in the axial direction and has a curvature surface substantially equal to the curvature of the outer peripheral surface of the rotor core are known.

By the way, when this segment magnet is fixed to the rotor core, it is generally fixed with an adhesive or fastened with a bolt, but if it is fixed with an adhesive, the segment magnet will drop due to deterioration over time. On the other hand, if it is fastened with bolts, the segment magnet may be damaged.
Therefore, as shown in FIG. 15, there is a technique in which a dovetail groove 82 is formed in a rotor core 81 that is externally fitted and fixed to a rotary shaft 80 and a segment magnet 83 is formed in a substantially trapezoidal cross section so as to correspond to the dovetail groove 82. Proposed. By doing in this way, the segment magnet 83 can be fixed to the rotating shaft 80 via the rotor core 81, without using an adhesive agent and a volt | bolt (for example, refer patent document 1).
JP 2000-152535 A

  However, in the above-described prior art, since the segment magnet 83 is fixed in the dovetail groove 82 of the rotor core 81, a magnetic path is formed between the segment magnets 83 (arrow X in FIG. 15). The magnetic flux flows, and the magnetic flux cannot be effectively formed on the stator side. Further, as shown in FIG. 15, a resin 84 is filled in the gap between the rotor core 81 and the segment magnet 83 in order to securely fix the segment magnet 83 to the rotor core 81. For this reason, it is difficult to form a magnetic path at a required location (arrow Y in FIG. 15). Therefore, there is a problem that it is difficult to effectively form magnetic flux on the stator side.

  Further, since the segment magnet 83 is fixed to the dovetail groove 82, if the machining accuracy varies, or if there is a difference in thermal expansion coefficient between the rotor core 81 and the segment magnet 83, the segment magnet 83 may be damaged during assembly, or during operation. There is a possibility that the segment magnet 83 may be damaged by the temperature rise. For this reason, there is a problem that it is difficult to be an effective means for preventing the segment magnet 83 from being damaged.

  Therefore, the present invention has been made in view of the above-described circumstances, and can effectively form a magnetic flux while securely fixing the segment magnet to the rotating shaft, and can prevent the segment magnet from being damaged. A rotor and a rotating electric machine capable of achieving the above are provided.

In order to solve the above-described problems, the invention described in claim 1 is a rotor in which a plurality of segment magnets are arranged in parallel in the circumferential direction on the outer periphery of a rotating shaft supported rotatably. The holding member is composed of a substantially cylindrical holding member body and a plurality of ridges provided radially outward on the holding member body, and the holding member body and the ridges. The segment magnet is formed so as to be insertable and fixed along the axial direction, and the segment magnet is formed so as to correspond to the insertion groove.
In this case, as in the invention described in claim 2, the insertion groove may be formed in a dovetail shape, and the ridge may be formed in a substantially trapezoidal cross section.
By comprising in this way, a segment magnet can be reliably fixed to the outer periphery of a rotating shaft, without using an adhesive agent and a volt | bolt.

The invention described in claim 3 is characterized in that the holding member is made of metal.
In this case, as in the invention described in claim 4, the holding member may be formed by laminating substantially annular plate materials.
By comprising in this way, the magnetic permeability of a holding member can be raised and it can make it easy to form a magnetic path in the required location.

The invention described in claim 5 is characterized in that a magnetic gap is provided along the axial direction on the ridge of the holding member.
With this configuration, it is possible to make it difficult to form a magnetic path between the segment magnets (to prevent leakage magnetic flux), and to effectively form a magnetic flux on the stator side. Moreover, the rigidity of a protruding item | line can be weakened by providing a magnetic gap.

The invention described in claim 6 is characterized in that the surface on the radially outer side of the ridge is set to be located on the inner side of the surface on the radially outer side of the segment magnet.
By comprising in this way, while being able to set the air gap between a segment magnet and a stator small, the air gap between the protruding item | line of a holding member and a stator can be set large.

The invention described in claim 7 is characterized in that an arc-shaped recess is formed on the radially outer surface of the protrusion.
By comprising in this way, a segment magnet can be reliably fixed to an insertion groove, setting the air gap between the protruding item | line of a holding member and a stator large. Moreover, the rigidity of the ridge can be further weakened.

  The invention described in claim 8 includes a rotor according to any one of claims 1 to 7 and a stator around which a coil is wound.

  According to the first and second aspects of the present invention, the segment magnet can be detached from the rotating shaft because the segment magnet can be securely fixed to the outer periphery of the rotating shaft without using an adhesive or a bolt. This can be prevented and a highly reliable rotor can be provided.

  According to the invention described in claim 3 and claim 4, the magnetic permeability of the holding member can be increased, and a magnetic path can be easily formed at a required location, so that the characteristics of the rotating electrical machine are improved. Can be made.

According to the fifth aspect of the present invention, it is possible to make it difficult to form a magnetic path between the segment magnets and to effectively form a magnetic flux on the stator side, thereby further improving the characteristics of the rotating electrical machine. be able to.
Also, since the rigidity of the ridges can be reduced by providing a magnetic gap, there may be variations in the processing accuracy of the holding members and segment magnets, and there may be a difference in the coefficient of thermal expansion between the holding members and the segment magnets. However, it becomes possible to prevent the segment magnets from being damaged when the rotating electrical machine is assembled or the temperature rises during operation.

  According to the invention described in claim 6, the air gap between the segment magnet and the stator can be set small, and the air gap between the protrusion of the holding member and the stator can be set large. . For this reason, the characteristic of a rotary electric machine can be improved further.

According to the invention described in claim 7, since the segment magnet can be securely fixed to the insertion groove while setting a large air gap between the protrusion of the holding member and the stator, the characteristics of the rotating electrical machine can be improved. The segment magnet can be securely fixed to the holding member while improving.
Further, since the rigidity of the ridge can be further reduced, the segment magnet can be more reliably prevented from being damaged.

Next, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the rotating electrical machine 1 is a so-called inner rotor having a stator 3 fitted and fixed to a casing 2 formed in a substantially cylindrical shape, and a rotor 10 rotatably provided inside the stator 3. Type brushless motor.
At both ends of the casing 2, step portions 8 are provided on the outer peripheral side, and a front bracket 60 and a rear bracket 61 are fitted and fixed so as to close the opening of the casing 2.

  The front bracket 60 is formed in a substantially disk shape, and a step portion 62 is formed on the inner peripheral edge so as to correspond to the step portion 8 of the casing 2. In addition, a convex portion 64 that protrudes outward in the axial direction is formed at the radial center of the front bracket 60. The convex portion 64 is formed in a substantially circular shape in the axial direction plan view. In the center of the convex portion 64, an insertion hole 63 for inserting the rotating shaft 11 of the rotor 10 is formed. A bearing housing 65 is formed inside the insertion hole 63 in the axial direction, and a bearing 66 that rotatably supports one end side of the rotating shaft 11 is provided here.

On the other hand, the rear bracket 61 is formed in a bottomed cylindrical shape, and a stepped portion 67 is formed in the opening so as to correspond to the stepped portion 8 of the casing 2. Further, an insertion hole 68 through which the rotation shaft 11 of the rotor 10 is inserted is formed in the center of the rear bracket 61 in the radial direction. A bearing housing 69 is formed inside the insertion hole 68 in the axial direction, and a bearing 70 that rotatably supports the other end side of the rotating shaft 11 is provided therein. In addition, the rear bracket 61 is provided with a power distribution plate 71 on the inner side in the axial direction.
The power distribution plate 71 is for supplying external power to each coil 7 wound around the stator 3 and is electrically connected to an external power source (not shown).

The stator 3 is formed by laminating plates of magnetic material in the axial direction or pressurizing magnetic metal powder, and has a substantially cylindrical stator core 4.
On the inner peripheral side of the stator core 4, a plurality of tooth portions 5 projecting radially inward are provided at equal intervals in the circumferential direction. An insulator 6 is attached to the teeth part 5 in part or in whole, and a coil 7 is wound around each of the tooth parts 5 via the insulator 6. The winding start end and winding end end of each coil 7 are drawn toward the rear bracket 61 side. Each of the winding start end and winding end end pulled out is electrically connected to a power distribution plate 71 provided on the rear bracket 61 via a terminal 72.

As shown in FIGS. 2 to 4, the rotor 10 includes a rotating shaft 11, a holding member 12 fitted and fixed to the rotating shaft 11, and a plurality of (this) In the embodiment, 10 segment magnets 13 are provided.
The rotating shaft 11 is formed in a stepped shape, and has a large-diameter portion 14 for externally fixing the holding member 12. A flange portion 15 is formed on the rear bracket 61 side (the right side in FIG. 2) of the large diameter portion 14. A first small diameter portion 17 is formed on the rear bracket 61 side of the flange portion 15 via a stepped portion 16. The first small diameter portion 17 is supported by the bearing 70 of the rear bracket 61.

  On the other hand, a reduced diameter portion 19 is formed on the front bracket 60 side (left side in FIG. 2) of the large diameter portion 14 via a stepped portion 18. A second small diameter portion 21 is formed on the front bracket 60 side of the reduced diameter portion 19 via a tapered portion 20. The tapered portion 20 is formed so that the diameter gradually decreases from the reduced diameter portion 19 toward the front bracket 60 side. The second small diameter portion 21 is supported by the bearing 66 of the front bracket 60.

  The holding member 12 is formed of a metal having high permeability (for example, a ferromagnetic material), and has a holding member body 22 formed in a substantially cylindrical shape and a diameter from the outer peripheral surface 22a of the holding member body 22. It comprises a plurality of (in this embodiment, ten) ridges 23 projecting radially outward. An inner diameter E <b> 1 (see FIG. 4) of the holding member main body 22 is set to a size that can be press-fitted into the rotating shaft 11. Each ridge 23 is formed along the axial direction, and is arranged in parallel at equal intervals in the circumferential direction. The length of the ridges 23 in the axial direction is set so as to substantially match the length of the holding member main body 22 in the axial direction.

As shown in FIG. 4, the ridge 23 is formed in a substantially trapezoidal cross section, and extends in the circumferential direction with a pair of inclined walls 24, 24 extending from the holding member main body 22 toward the radially outer side. And a curved surface 25. The inclination angle θ2 of the inclined wall 24 of the ridge 23 is set in a range of 0 ° <θ2 <45 °. A plurality of dovetail-shaped insertion grooves 26 for inserting and fixing the segment magnet 13 are formed by the inclined walls 24, 24 of the ridge 23 and the outer peripheral surface 22 a of the holding member main body 22.
In addition, on the inner peripheral surface 22 b of the holding member main body 22, a narrow groove-like magnetic gap 9 extends in the region corresponding to the ridge 23 to the vicinity of the curved surface 25 of the ridge 23 along the radial direction.

  As shown in FIGS. 4 and 5, the segment magnet 13 is formed in a tile shape with a curvature that is long in the axial direction and substantially equal to the curvature of the outer peripheral surface 22 a of the holding member main body 22. The length of the segment magnet 13 in the axial direction is set so as to substantially match the length of the holding member main body 22 in the axial direction. The segment magnet 13 is formed in a substantially trapezoidal cross section so as to correspond to the insertion groove 26 formed in the holding member 12, and has an outer curved surface 27, an inner curved surface 28, and a circumferential direction opposed to each other in the radial direction. Opposing side walls 29, 29 are provided. The angle θ1 between the side walls 29 of the segment magnet 13 is set in a range of 0 ° <θ1 <90 ° so as to correspond to the inclination angle θ2 of the inclined wall 24 of the ridge 23.

That is, the segment magnet 13 is formed so that it can be inserted into the insertion groove 26 along the axial direction and cannot be inserted into the insertion groove 26 from the outside in the radial direction. Moreover, the circumferential width of the segment magnet 13 (the width between the side walls 29, 29) is set slightly larger than the width between the inclined walls 24, 24 of the adjacent ridges 23, and the tip of the segment magnet 13 Has a tapered portion 49 formed to be tapered. Accordingly, the segment magnet 13 is press-fitted and fixed to the insertion groove 26. However, since the tapered portion 49 serves as a guide when the segment magnet 13 is inserted into the insertion groove 26, the segment magnet 13 is inserted into the insertion groove 26. 26 can be smoothly inserted.
Further, the curvature radius R1 of the curved surface 25 of the ridge 23 is set smaller than the curvature radius R2 of the outer curved surface 27 of the segment magnet 13. That is, the curved surface 25 of the ridge 23 is set so as to be located radially inward of the outer curved surface 27 of the segment magnet 13.

Next, the assembly procedure of the rotor 10 will be described.
As shown in FIG. 2, first, the holding member 12 is inserted from the front bracket 60 side (left side in FIG. 2) of the rotating shaft 11 toward the large diameter portion 14. At this time, it inserts until the holding member 12 contact | abuts to the flange part 15 currently formed in the large diameter part 14. FIG. The holding member 12 is positioned by being brought into contact with the flange portion 15.

Next, the segment magnet 13 is inserted into the insertion groove 26 of the holding member 12 along the axial direction from the front bracket 60 side (left side in FIG. 2) of the rotating shaft 11. The segment magnet 13 is also inserted until it contacts the flange portion 15 of the rotating shaft 11. By doing in this way, the fixed position of the segment magnet 13 can be determined.
Then, the segment magnet 13 is inserted into all the insertion grooves 26 of the holding member 12, and the assembly of the rotor 10 is completed.
The rotor 10 assembled in this manner is driven to rotate by a magnetic attractive force or a repulsive force generated between the magnetic field formed in each tooth portion 5 of the stator 3 and the segment magnet 13.

  Therefore, according to the first embodiment described above, by inserting the segment magnet 13 having a shape corresponding to the insertion groove 26 into the dovetail insertion groove 26 formed in the holding member 12, an adhesive or a bolt can be attached. The segment magnet 13 can be securely fixed to the outer periphery of the rotating shaft 11 without using it. For this reason, it is possible to prevent the segment magnet 13 from falling off the rotating shaft 11 and to provide a highly reliable rotor 10.

  In addition, since the holding member 12 is made of a metal having high permeability (for example, a ferromagnetic material), it is possible to easily form a magnetic path at a necessary place (arrow A in FIG. 4). For this reason, the characteristic of the rotary electric machine 1 can be improved. Moreover, since the thin groove-like magnetic gap 9 is formed in the ridge 23 interposed between the adjacent segment magnets 13, it is difficult to form a magnetic path between the segment magnets 13 (to prevent leakage magnetic flux). be able to. For this reason, a magnetic flux can be effectively formed in the stator 3 side, and the characteristic of the rotary electric machine 1 can be improved more.

  In addition to this, the curved surface 25 of the ridge 23 is set so as to be located on the radially inner side of the outer curved surface 27 of the segment magnet 13. For this reason, while setting the air gap S1 (refer FIG. 1, FIG. 4) between the outer curved surface 27 of the segment magnet 13 and the inner peripheral surface 5a of the teeth part 5 of the stator 3 small, An air gap S2 (see FIG. 4) between the inner peripheral surface 5a of the tooth portion 5 can be set large. Therefore, the inductance of the coil 7 wound around the tooth portion 5 can be reduced, and the characteristics of the rotating electrical machine 1 can be further improved.

  Furthermore, since the magnetic gap 9 is formed in a narrow groove shape, the rigidity of the ridge 23 can be weakened. For this reason, even if there are variations in the processing accuracy of the holding member 12 and the segment magnet 13 and there is a difference in the coefficient of thermal expansion between the holding member 12 and the segment magnet 13, the brushless motor can be assembled or operated. It becomes possible to prevent the segment magnet 13 from being damaged due to the temperature rise.

  Here, the coefficient of thermal expansion refers to the rate at which the length or volume of an object expands as the temperature rises. Normally, if the coefficient of thermal expansion of the holding member 12 and the coefficient of thermal expansion of the segment magnet 13 are different, the size of the cross-sectional area of the insertion groove 26 of the holding member 12 and the size of the segment magnet 13 are increased due to the temperature rise accompanying the operation of the rotating electrical machine 1. The size of the cross-sectional area will be different. For this reason, there is a possibility that the segment magnet 13 may be compressed and damaged. However, in this embodiment, since the thin groove-like magnetic gap 9 is formed on the protrusion 23 of the holding member 12, The rigidity can be made weaker than the rigidity of the segment magnet 13, and as a result, the segment magnet 13 can be prevented from being damaged.

  In addition, since the flange portion 15 is formed on the rear bracket 61 side of the large-diameter portion 14 in the rotary shaft 11, when fixing the holding member 12 and the segment magnet 13, The holding member 12 and the segment magnet 13 can be positioned simply by contacting them. For this reason, the rotor 10 can be easily assembled without using a positioning jig or the like, and work efficiency can be improved.

Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the aspect same as 1st embodiment, and description is abbreviate | omitted.
In this second embodiment, the rotating electrical machine 1 is composed of a stator 3 that is fitted and fixed to a substantially cylindrical casing 2 and a rotor 10 that is rotatably provided to the stator 3. The rotor 10 includes a rotating shaft 11, a holding member 30 that is externally fitted to the rotating shaft 11, and a plurality of segment magnets 13 that are arranged in parallel in the circumferential direction on the outer peripheral surface of the holding member 30. The basic configuration is the same as that of the first embodiment described above (the same applies to the following embodiments).

Here, the holding member 30 has a substantially cylindrical holding member main body 31 formed by laminating a substantially annular ring member 32.
On the outer peripheral surface 31a of the holding member main body 31, a plurality of ridges 33 project radially. The ridge 33 is formed in a substantially trapezoidal cross section, and includes a pair of inclined walls 34 and 34 that extend radially outward from the holding member main body 31 and a curved surface 35 that extends in the circumferential direction. Yes. The curved surface 35 is formed with a recess 50 having a circular arc cross section.
Further, a groove-like magnetic gap 36 is formed on the inner peripheral surface 31 b of the holding member body 31 at a portion corresponding to the ridge 33. The magnetic gap 36 is formed to expand toward the radially outer side so as to correspond to the cross-sectional shape of the ridge 33.

Furthermore, the inner peripheral surface 31b of the holding member main body 31 is provided with a ridge 37 that protrudes radially inward in at least one of the portions corresponding to the ridge 33 (FIGS. 7 and 8). reference). The ridge 37 has a role of preventing the holding member 30 from rotating with respect to the rotating shaft 11 and is provided along the axial direction. Therefore, in the magnetic gap 36 formed on the inner peripheral surface 31 b of the holding member main body 31, a state in which the hole-shaped magnetic gap 36 a is formed in the protrusion 33 in the portion where the protrusion 37 is provided. It has become.
As shown in FIGS. 7 and 9, a groove 38 is formed in a portion corresponding to the ridge 37 of the rotating shaft 11. The grooves 38 are formed so as to correspond to the ridges 37, and the ridges 37 are fitted therein.

Therefore, according to the second embodiment described above, in addition to the effects of the first embodiment, the holding member main body 31 is formed by laminating a plurality of substantially annular ring members 32 in the axial direction, thereby reducing the number of manufacturing steps. Can be made.
Further, a magnetic gap 36 is formed on the ridge 33 interposed between the adjacent segment magnets 13 so as to correspond to the cross-sectional shape of the ridge 33, and a concave portion 50 having an arcuate cross section is formed on the curved surface 35 of the ridge 33. Therefore, the rigidity of the ridge 33 can be further reduced as compared with the first embodiment. Therefore, breakage of the segment magnet 13 can be prevented more reliably.

  Furthermore, the concave portion 50 is formed on the curved surface 35 of the ridge 33, so that the side walls 29, 29 of the segment magnet 13 are securely held by the inclined walls 34, 34 of the ridge 33, and the curved surface 35 of the ridge 33 is The air gap between the teeth part 5 and the inner peripheral surface 5a can be set larger than in the first embodiment. For this reason, the inductance of the coil 7 wound around the tooth portion 5 can be reduced, and the characteristics of the rotating electrical machine 1 can be further improved.

  And while providing the protruding item | line 37 which protrudes toward radial inside on the internal peripheral surface 31b of the holding member main body 31, since the groove | channel 38 is formed in the site | part corresponding to the protruding item | line 37 of the rotating shaft 11, It is possible to prevent the holding member 30 from rotating around the rotation shaft 11. For this reason, the holding member 30 can be more reliably fixed to the rotating shaft 11.

Next, a third embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 10 to 12, the holding member 40 of the third embodiment is also formed by laminating a plurality of ring members 41 made of metal and formed in a substantially annular shape in the axial direction as in the second embodiment. Is.
A plurality of substantially trapezoidal protrusions 42 (six in this embodiment) are provided on the outer peripheral surface 41 a of the ring member 41. The protrusion 42 includes a pair of inclined walls 44, 44 extending from the ring member 41 toward the radially outer side, and a curved surface 45 extending in the circumferential direction. The curved surface 45 is formed with a concave portion 54 having an arc cross section.

  Here, as shown in FIG. 11, the protrusions 42 provided on the outer peripheral surface 41a of the ring member 41 are not provided at equal intervals in the circumferential direction as in the first embodiment and the second embodiment. In other words, the protrusions 42 are provided by a pair of adjacent protrusions 42, 42 being provided by skipping two protrusions 42 in the circumferential direction, and then being provided by skipping one protrusion 42 in the circumferential direction, for a total of six protrusions 42. Is provided.

A magnetic gap 43 is provided at a portion corresponding to the protrusion 42 on the inner peripheral surface 41 b of the ring member 41.
Further, of the protrusions 42, the two protrusions 42 that are present at equal intervals in the circumferential direction, that is, the two protrusions 42 that are present at intervals of 180 ° in the circumferential direction, when the ring member 41 is laminated in the axial direction. A caulking convex portion 46 to be used is provided. Therefore, in the magnetic gap 43 formed on the inner peripheral surface 41 b of the ring member 41, a hole-like magnetic gap 43 a is formed in the protrusion 42 at a portion where the convex portion 46 is provided. ing.

  When forming the holding members 40, the ring members 41 are stacked while rotating in the circumferential direction by 180 ° (see FIG. 12). Then, the protrusions 42 are piled up at intervals of one ring member 41 except for the protrusions 46 for caulking. For this reason, the ridges 47 provided on the outer peripheral surface 48a of the holding member main body 48 formed by laminating the ring members 41 are formed in a state where teeth are missing at equal intervals in the axial direction.

  Therefore, according to the above-described third embodiment, in addition to the effects of the first embodiment and the second embodiment, the ridges 47 provided on the outer peripheral surface 48a of the holding member main body 48 are teeth at regular intervals in the axial direction. Since it is formed in a disconnected state, an air gap between the protrusion 47 and the inner peripheral surface 5a of the tooth portion 5 can be further secured, and the coil 7 wound around the tooth portion 5 can be secured. Inductance can be further reduced. For this reason, the characteristic of the rotary electric machine 1 can be further improved.

Further, since the weight of the ridge 47 can be reduced, the inertia of the rotor 10 can be reduced. For this reason, the characteristic of the rotary electric machine 1 can be improved more.
Furthermore, since the holding member 40 is formed by stacking each ring member 41 while rotating the ring member 41 in the circumferential direction by 180 °, it is possible to stack the ring members 41 without shifting manufacturing errors to one place. Therefore, it is possible to improve the accuracy of the holding member 40 (for example, the cylindricity of the holding member main body 48).

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
Moreover, although the above-mentioned embodiment demonstrated the case where the rotary electric machine 1 was a brushless motor, it is not restricted to this, For example, a generator etc. may be sufficient.
Furthermore, in the above-described embodiment, the case where the tapered portion 49 is formed at the tip of the segment magnet 13 has been described. However, the present invention is not limited to this, and the tip of the segment magnet 13 may not be tapered. Good.

  And in the above-mentioned embodiment, although the flange part 15 was formed in the large diameter part 14 of the rotating shaft 11, and the holding member 12 and the segment magnet 13 were contact | abutted to this flange part 15, and each was positioned, it demonstrated. However, the present invention is not limited to this, and the holding members 12, 30, 40 and the segment magnet 13 may be positioned by using, for example, a positioning jig without providing the flange portion 15.

  In the above-described embodiment, the holding members 12, 30, and 40 are rotated by setting the inner diameter E <b> 1 (see FIG. 4) of the holding member bodies 22, 31, and 48 to a size that can be press-fitted into the rotating shaft 11. Although the case where it adheres to the axis | shaft 11 was demonstrated, it is not restricted to this, The holding member 12,30,40 does not need to be press-fit in the rotating shaft 11. FIG. In this case, the holding members 12, 30, and 40 are fixed to the rotating shaft 11 using an adhesive or the like.

  Furthermore, in the above-described embodiment, a case has been described in which ten protrusions 23, 33, 47 are provided on the holding members 12, 30, 40, and ten segment magnets 13 are arranged in parallel in the circumferential direction. The number of protrusions 23, 33, 47 of the holding members 12, 30, 40 and the number of segment magnets 13 may be two or more.

  In the above-described embodiment, as an assembly procedure of the rotor 10, the case where the holding members 12, 30, and 40 are externally fixed to the rotating shaft 11 and then the segment magnet 13 is set to the holding members 12, 30, and 40 will be described. However, the assembly procedure is not limited to this, and after the segment magnet 13 is set on the holding members 12, 30, 40, the holding members 12, 30, 40 may be externally fixed to the rotary shaft 11. .

  In the above-described embodiment, the case where the assembly of the rotor 10 is completed by attaching the holding members 12, 30, 40 and the segment magnet 13 to the rotating shaft 11 has been described. As shown in FIG. 13, the holding members 12, 30 and 40 and the segment magnet 13 may be sandwiched between the flange portion 15 of the rotating shaft 11 and the stopper 51 by attaching the stopper 51.

Here, the stopper 51 is made of metal formed in a substantially annular shape, and after the holding members 12, 30, and 40 and the segment magnet 13 are attached to the rotating shaft 11, the front bracket 60 of the rotating shaft 11. It is designed to be inserted from the side.
As shown in FIG. 14, the stopper 51 has an insertion hole 52 through which the rotation shaft 11 is inserted in the center in the radial direction. The diameter of the insertion hole 52 is set such that it can be press-fitted and fixed to the stepped portion 18 of the rotating shaft 11. Further, the stopper 51 is formed with a concave portion 53 having a substantially circular shape in a plan view in the axial direction on the holding members 12, 30 and 40 side. The diameter of the concave portion 53 is set to be slightly larger than that of the large-diameter portion 14 of the rotary shaft 11, and the peripheral wall 51 a of the stopper 51 reliably contacts the holding members 12, 30, 40 and the segment magnet 13. It is like that.

  Furthermore, in the above-described third embodiment, a case where the holding member 40 is formed by providing the protrusions 42 provided on the ring member 41 with the convex portions 46 for caulking that allow the ring member 41 to be laminated and fixed in the axial direction will be described. However, the present invention is not limited to this. For example, the ring member 41 may be laminated and fixed using a rivet or the like.

  Furthermore, in the above-described third embodiment, the ring member 41 is formed on two protrusions 42 that are spaced apart by 180 ° in the circumferential direction, out of a total of six protrusions 42 provided at unequal intervals in the circumferential direction. A case has been described in which the caulking convex portions 46 used when laminating in the axial direction are provided, and the ring members 41 are stacked while rotating in the circumferential direction by 180 °. However, the present invention is not limited to this, and the protrusions 47 provided on the outer peripheral surface 48a of the holding member main body 48 may be formed in a state in which teeth are missing at equal intervals in the axial direction. The number of the convex portions 46 for caulking and the circumferential rotation angle at the time of stacking may be changed according to the number of segment magnets to be used.

It is a partial longitudinal cross-sectional view which shows the structure of the rotary electricity in embodiment of this invention. It is a perspective view which shows the structure of the rotor in 1st embodiment of this invention. It is a perspective view of the rotor in 1st embodiment of this invention. It is a cross-sectional view of the rotor in the first embodiment of the present invention. It is a perspective view of the segment magnet in the embodiment of the present invention. It is a perspective view of the rotor in 2nd embodiment of this invention. It is a partial enlarged view of the rotor in 2nd embodiment of this invention. It is a perspective view of the holding member in a second embodiment of the present invention. It is a perspective view of the rotating shaft in 2nd embodiment of this invention. It is a perspective view of the rotor in 3rd embodiment of this invention. It is a perspective view of the ring member in a third embodiment of the present invention. It is a perspective view of the holding member in a third embodiment of the present invention. It is a perspective view of a rotor in an embodiment of the present invention. It is a longitudinal cross-sectional view of the rotor in embodiment of this invention. It is a cross-sectional view of a conventional rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 3 Stator 7 Coil 9,36,36a, 43,43a Magnetic gap 10 Rotor 11 Rotating shaft 12,30,40 Holding member 13 Segment magnet 22,31,48 Holding member main body 23,33,47 Projection 26 Insertion groove 41 Ring member (substantially annular plate)
50, 54 Recess R1, R2 Curvature radius

Claims (8)

A rotor in which a plurality of segment magnets are arranged in parallel in the circumferential direction via a holding member on the outer periphery of a rotating shaft that is rotatably supported,
The holding member is composed of a substantially cylindrical holding member main body and a plurality of ridges provided radially outward on the holding member main body,
The holding member main body and the protrusions form an insertion groove in which the segment magnet can be inserted and fixed along the axial direction, and the segment magnet is formed to correspond to the insertion groove. .   The rotor according to claim 1, wherein the insertion groove is formed in a dovetail shape, and the protrusion is formed in a substantially trapezoidal cross section.   The rotor according to claim 1, wherein the holding member is made of metal.   The rotor according to any one of claims 1 to 3, wherein the holding member is formed by laminating substantially annular plate members.   The rotor according to any one of claims 1 to 4, wherein a magnetic gap is provided along the axial direction on the ridge of the holding member.   The rotor according to any one of claims 1 to 5, wherein a surface on the radially outer side of the ridge is set to be located inside a surface on the radially outer side of the segment magnet. .   The rotor according to any one of claims 1 to 6, wherein an arc-shaped recess is formed on a radially outer surface of the protrusion.   A rotating electrical machine comprising: the rotor according to claim 1; and a stator around which a coil is wound.

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