JP2007209169A - Segment magnet rotor fixing structure and rotary machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a segment magnet rotor fixing structure where a plurality of segment magnets are positioned to be uniformly arranged, and dislocation after fitting is prevented, and also to provide a rotary machine. <P>SOLUTION: In the segment magnet rotor fixing structure, the segment magnets 20 are engaged between adjacent magnet position decision projections 41 and 41 formed in a shaft installation ring 40. Thus, a plurality of the segment magnets 20 are positioned so that they are uniformly arranged. Dislocation of the segment magnets 20 after fitting is thereby prevented. Since the shaft installation ring 40 is vertically divided into two, it is easily fitted to a ring engagement part 31 of a structure where a peripheral face of a rotor shaft 16 is depressed in a groove shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a segment magnet rotor fixing structure and a rotating machine for evenly arranging and fixing a plurality of segment magnets on a rotor shaft provided in the rotating machine.

Conventionally, the segment magnet is fixed to the rotor shaft with, for example, an adhesive (see, for example, Patent Document 1).
JP 2004-328818 A (paragraphs [0029]-[0030], [FIG. 1])

  However, the conventional fixing structure described above has a problem that it is difficult to attach a plurality of segment magnets so as to be evenly arranged, and the segment magnets are likely to be displaced after the attachment.

  The present invention has been made in view of the above circumstances, and provides a segment magnet rotor fixing structure and a rotating machine capable of positioning a plurality of segment magnets so as to be evenly arranged and preventing positional deviation after attachment. With the goal.

  In order to achieve the above object, a segment magnet rotor fixing structure according to the invention of claim 1 includes a plurality of segment magnets (20) on a rotor shaft (16, 16 ', 60) provided in a rotating machine (10). In the segment magnet rotor fixing structure for evenly arranging and fixing, a plurality of magnet positioning protrusions (41, 51, 61) are provided at positions where the rotor shaft (16, 16 ', 60) is equally divided in the circumferential direction. The segment magnet (20) is fitted between the adjacent magnet positioning protrusions (41, 51, 61).

  According to a second aspect of the present invention, in the segment magnet rotor fixing structure according to the first aspect, a plurality of magnet positioning protrusions (41, 51) are integrally provided and cannot be rotated outside the rotor shaft (16, 16 '). It is characterized in that a shaft mounting ring (40, 50) fitted and fixed to is provided.

  According to a third aspect of the present invention, in the segment magnet rotor fixing structure according to the second aspect, the ring fitting portion (31, 31) in which the shaft mounting ring (40, 50) is fitted to the rotor shaft (16, 16 '). 31 ′), a ring adjacent large diameter portion (30, 32) having an outer diameter larger than the ring fitting portion (31, 31 ′) is formed, and the shaft mounting ring (40, 50) is a ring fitting. It is composed of a pair of semicircles (42, 52) that are fitted to the joint portions (31, 31 ') from the side and merged with each other, and the semicircle on the other side of each semicircle (42, 52) Ring fixing projections (43) projecting toward the ring adjacent large diameter portions (30, 32) are formed at both end portions (42A, 52A) to be abutted against the body (42, 52), respectively. On the diameter part (30, 32), there is a ring fixing projection (43) Each inserted ring fixing groove in the axial direction of the rotor shaft (16, 16 ') (33) having characterized in that is formed.

  According to a fourth aspect of the present invention, in the segment magnet rotor fixing structure according to the third aspect, the ring adjacent large-diameter portions (30, 32) are provided in pairs with the ring fitting portion (31) interposed therebetween. The magnet (20) is disposed so as to cover at least one of the ring adjacent large diameter portions (30, 32) and the outer peripheral surface of the ring fitting portion (31), and the width of the ring fitting portion (31) is set to be a ring fixing protrusion. The shaft mounting ring (40) including the portion (43) is made longer than the total axial length, and the shaft mounting ring (40) is closer to one ring adjacent large diameter portion (30, 32) of the ring fitting portion (31). The ring fixing protrusion (43) is inserted into the ring fixing groove (33) formed in one of the ring adjacent large diameter portions (30, 32), and the magnet positioning protrusion (41) is connected to the shaft. Peripheral surface of mounting ring (40) Characterized in was protruded in the radial direction.

  The invention of claim 5 is the segment magnet rotor fixing structure according to claim 4, wherein the outer diameter of the portion sandwiched between adjacent magnet positioning protrusions (41) of the shaft mounting ring (40) is It is characterized by being made smaller than the outer diameter of the ring adjacent large diameter portion (30, 32).

  According to a sixth aspect of the present invention, in the segment magnet rotor fixing structure according to the third aspect, the ring fitting portion (31 ′) is a magnet fixing portion to which the segment magnet (20) of the rotor shaft (16 ′) is mounted. (30 ') is arranged at the end of the magnet fixing portion (30') and has the same diameter as the magnet fixing portion (30 '). The ring adjacent large diameter portion (32) has a magnet fixing portion (30 The magnet positioning protrusion (51) is arranged on the side opposite to '), and is characterized in that it protrudes from the end face of the shaft mounting ring (50) to the side opposite to the ring fixing protrusion (43).

  The invention of claim 7 is the segment magnet rotor fixing structure according to claim 6, wherein the shaft mounting ring (50) is sandwiched between the segment magnet (20) and the ring adjacent large diameter portion (32) and fixed in the axial direction. It has the characteristics in that place.

  According to an eighth aspect of the present invention, in the segment magnet rotor fixing structure according to the first aspect, a plurality of pin holes (62) are formed at positions that equally divide the outer peripheral surface of the rotor shaft (60), and the pin holes (62 ) And a plurality of press-fit pins (63) disposed on the inner side of the pin hole (62) from the outer peripheral surface of the rotor shaft (60), and the magnet positioning protrusion (61) is formed of the press-fit pin (63). One end of the rotor is integrally formed on the same axis and protrudes radially from the outer peripheral surface of the rotor shaft (60).

  A rotating machine (10) according to the invention of claim 9 is characterized in that it has the segment magnet rotor fixing structure according to any one of claims 1 to 8.

[Inventions of Claims 1, 8 and 9]
According to the first and ninth aspects of the present invention, the segment magnets are fixed to the rotor shaft in a state of being fitted between adjacent magnet positioning protrusions, so that the plurality of segment magnets are evenly arranged. Can be positioned. In addition, even after the segment magnet is attached to the rotor shaft, the segment magnet can be prevented from being displaced.

  Here, as in the invention of claim 8, a plurality of pin holes are formed at positions that equally divide the outer peripheral surface of the rotor shaft, and the magnet positioning protrusions are formed integrally with the press-fit pins press-fitted into these pin holes. Then, it may be configured to protrude in the radial direction from the outer peripheral surface of the rotor shaft. The rotor shaft may be circular in cross section or polygonal in cross section (specifically, a cross sectional regular polygon having the same number of planes as the number of segment magnets).

[Invention of claim 2]
According to the second aspect of the present invention, since the magnet positioning protrusion is provided integrally with the shaft mounting ring, it is not necessary to perform additional processing on the rotor shaft in order to form the magnet positioning protrusion.

[Invention of claim 3]
In order to fit and fix the shaft mounting ring to the rotor shaft, the shaft mounting ring is divided into a pair of semicircles, and each semicircle is fitted to the ring fitting portion from the side, and the large diameter portion adjacent to the ring Move to the side. Then, the ring fixing protrusions formed at both ends of each semicircular body are inserted and engaged with the ring fixing grooves formed in the ring adjacent large diameter portion from the axial direction. As a result, the pair of semicircles are combined so as not to be separated, and the shaft mounting ring is fitted and fixed to the ring fitting portion of the rotor shaft so as not to rotate.

[Invention of claim 4]
To fit and fix the shaft mounting ring to the ring fitting part, after fitting a pair of semicircles at a position away from one ring adjacent large diameter part of the ring fitting part, one ring adjacent part Move it closer to the large diameter part. Then, the ring fixing protrusion is inserted into and engaged with the ring fixing groove, and the shaft mounting ring is fitted and fixed to the ring fitting portion in a non-rotatable and non-detachable manner. Next, in order to fix the segment magnet, for example, an adhesive is applied to the inner surface of the segment magnet and / or the outer surface of the ring adjacent large diameter portion, and the segment magnet is bonded to the ring adjacent large diameter portion from the side. At this time, the segment magnet is fitted between the magnet positioning protrusions protruding in the radial direction from the outer peripheral surface of the shaft mounting ring. Thereby, it positions so that a some segment magnet may be arrange | positioned equally, and the position shift after adhesion | attachment is prevented. Here, when the segment magnet is fixed to the large diameter portion adjacent to the ring, the outer peripheral surface of the portion of the shaft mounting ring sandwiched between the adjacent magnet positioning protrusions is covered with the segment magnet. The shaft mounting ring can be prevented from falling off.

[Invention of claim 5]
According to invention of Claim 5, the inner surface of a segment magnet can be closely_contact | adhered to a ring adjacent large diameter part.

[Invention of claim 6]
In order to fit and fix the shaft mounting ring to the ring fitting portion, the pair of semicircles are fitted at positions away from the ring adjacent large diameter portion, and then moved so as to approach the ring adjacent large diameter portion. Then, the ring fixing protrusion is inserted into and engaged with the ring fixing groove, and the shaft mounting ring is fitted and fixed to the ring fitting portion of the rotor shaft so that it cannot rotate and cannot be detached. Next, in order to fix the segment magnet, for example, an adhesive is applied to the inner surface of the segment magnet and / or the outer surface of the magnet fixing portion, and the segment magnet is bonded to the magnet fixing portion from the side. At this time, the segment magnet is fitted between the magnet positioning protrusions formed so as to protrude from the shaft mounting ring in the axial direction of the rotor shaft. Thereby, it positions so that a some segment magnet may be arrange | positioned equally, and the position shift after adhesion | attachment is prevented.

[Invention of Claim 7]
According to the invention of claim 7, when the segment magnet is fixed to the magnet fixing portion, the shaft mounting ring is sandwiched between the segment magnet and the ring adjacent large diameter portion and fixed in the axial direction. It is possible to prevent the shaft mounting ring from falling off.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The motor 10 (corresponding to the “rotor” of the present invention) of the present embodiment is, for example, a brushless motor, and includes a stator 12 inside a cylindrical housing 11, and a rotor 17 can be rotated inside the stator 12. In preparation. The stator 12 includes a stator core 14 and a plurality of coils 25. A plurality of teeth 15 protrudes inward from the inner surface of the stator core 14, and the tips of the teeth 15 spread in a dovetail shape. And the coil 25 is comprised by winding an electric wire around each teeth 15, and a part of each coil 25 is accommodated in the slot 13 between the adjacent teeth 15,15. Note that, for example, twelve teeth 15 and slots 13 are provided in the stator 12 of the present embodiment.

  As shown in FIG. 2, the rotor 17 is formed by uniformly arranging a plurality (specifically, for example, 14) of field segment magnets 20 on the outer peripheral surface of the rotor shaft 16. Specifically, the rotor shaft 16 has a structure in which the shaft 19 is passed through the center of a rotating cylindrical body 18 formed by laminating a plurality of silicon steel plates, for example. And the segment magnet 20 is being fixed with the adhesive agent, for example in the position which distribute | arranged the outer peripheral surface of the rotating cylindrical body 18 equally in the circumferential direction.

  Each segment magnet 20 is a permanent magnet made of a sintered member, and has a tile shape extending in the axial direction of the rotor shaft 16 as shown in FIGS. Specifically, for example, a structure in which a cylindrical body that can be fitted to the outside of the rotating cylindrical body 18 is divided into a plurality of parts is divided. The segment magnet 20 includes concentric arc surfaces centered on the rotor shaft 16 as an inner surface 20A and an outer surface 20B. Further, the side surfaces 20C and 20C of the segment magnet 20 are configured such that the surfaces including the both side surfaces 20C and 20C intersect at the center of the rotor shaft 16. These segment magnets 20 are fixed to the rotor shaft 16 by the “segment magnet rotor fixing structure” of the present invention.

  Hereinafter, the “segment magnet rotor fixing structure” of the present invention will be described. As shown in FIG. 3, the central portion in the axial direction of the rotor shaft 16 (rotating cylindrical body 18) is a magnet fixing portion 30 having a circular cross section to which the segment magnet 20 is fixed. Fitting portions 31, 31 are formed. The ring fitting portions 31, 31 have a structure in which the outer peripheral surface of the rotor shaft 16 is recessed into a groove shape over the entire circumference. That is, the ring fitting portions 31 and 31 are reduced in diameter from the magnet fixing portion 30 in a stepped shape, for example, a circular cross section.

  On the end side of the rotor shaft 16 with respect to the ring fitting portions 31, 31, end large diameter portions 32, 32 whose outer diameters are increased stepwise with respect to the ring fitting portions 31, 31 are formed. ing. The end large-diameter portions 32, 32 are, for example, circular in cross section and have the same outer diameter as the magnet fixing portion 30. Here, the magnet fixing portion 30 and the end large-diameter portions 32 and 32 correspond to the “ring adjacent large-diameter portion” of the present invention, and are paired with the ring fitting portions 31 and 31 interposed therebetween.

  Incidentally, a pair of ring fixing grooves 33 and 33 are formed in the end large diameter portions 32 and 32, respectively. These ring fixing grooves 33, 33 are formed at two positions 180 degrees apart from each other in the circumferential direction of the rotor shaft 16 (Note that only one ring fixing groove 33 in the circumferential direction is shown in FIGS. It is shown). The ring fixing grooves 33 and 33 are open to the ring fitting portions 31 and 31 side and the radially outer side of the rotor shaft 16 (see FIG. 5).

  As shown in FIG. 3, a shaft mounting ring 40 is fitted and fixed to the ring fitting portions 31 and 31 of the rotor shaft 16. As shown in FIG. 4, the shaft mounting ring 40 has a cylindrical structure that is flat in the axial direction, and has a larger width dimension (length in the axial direction) than the thickness. On the outer peripheral surface of the shaft mounting ring 40, a plurality of (for example, 14 in this embodiment) magnet positioning protrusions 41 project from the outer side in the radial direction. The magnet positioning protrusions 41 are provided at equal intervals in the circumferential direction of the shaft mounting ring 40 and have a ridge structure extending in the axial direction on the outer peripheral surface of the shaft mounting ring 40. In addition, the both side surfaces of the magnet positioning protrusion 41 are configured such that the surfaces including the both side surfaces intersect at the center of the shaft mounting ring 40 (in other words, the rotor shaft 16).

  The inner diameter of the shaft mounting ring 40 is substantially the same as the outer diameter of the ring fitting portions 31, 31, and the outer diameter of the portion of the shaft mounting ring 40 where the magnet positioning protrusion 41 is formed is the magnet fixing portion 30. It is larger than the outer diameter. Further, the outer diameter of the portion of the shaft mounting ring 40 sandwiched between the adjacent magnet positioning protrusions 41, 41 is slightly smaller than the outer diameter of the magnet fixing portion 30. That is, in the shaft mounting ring 40, only the magnet positioning protrusion 41 protrudes outward from the outer surface of the magnet fitting portion 30, and the portion sandwiched between the magnet positioning protrusions 41 and 41 is the magnet fitting portion 30. And it is dented with respect to the outer surface of the end part large diameter part 32. The shaft mounting ring 40 is a non-magnetic material, and is manufactured by, for example, press molding or sintering molding depending on the material.

  By the way, the shaft mounting ring 40 is composed of a pair of semicircular bodies 42, 42. The semicircular bodies 42, 42 are planes that include the central axis of the shaft mounting ring 40 and pass through the intermediate portions of the adjacent magnet positioning protrusions 41, 41, and the shaft mounting ring 40 is divided into two vertically. It has become.

  Ring fixing projections 43 and 43 are formed at both end portions 42A and 42A of the semicircular bodies 42 and 42, which are joined to the mating semicircular body 42 when the shaft mounting ring 40 is combined. Has been. The ring fixing protrusions 43, 43 protrude from the end face of the shaft mounting ring 40 toward one side in the axial direction. As shown in FIG. 3, the ring fixing protrusions 43, 43 are inserted into the ring fixing grooves 33, 33 formed on the outer peripheral surface of the rotor shaft 16 from the axial direction of the rotor shaft 16 so as to engage with the unevenness. Yes. Thus, the pair of semicircular bodies 42 and 42 are fitted and fixed to the outer peripheral surface of the rotor shaft 16 as the shaft mounting ring 40, and the shaft mounting ring 40 is prevented from rotating with respect to the rotor shaft 16.

  And the both ends of each segment magnet 20 are fitting between the magnet positioning protrusions 41 and 41 which are formed in the shaft mounting ring 40 and are adjacent to each other (see FIG. 3).

  Here, the width dimension L1 (the total length in the axial direction) of the ring fitting portions 31, 31 is larger than the width dimension L2 (the total length in the axial direction) of the shaft mounting ring 40 including the ring fixing protrusions 43, 43. ing. Thereby, each semicircle 42 and 42 can be assembled | attached to the ring fitting parts 31 and 31 from a side.

  The configuration of the motor 10 according to the present embodiment is as described above. Next, a method for manufacturing the motor 10 will be described. First, the two shaft mounting rings 40 and 40 are respectively assembled to the rotor shaft 16. That is, the shaft mounting rings 40 and 40 are divided into a pair of semicircular bodies 42 and 42, respectively, and these semicircular bodies 42 and 42 are assembled to the ring fitting portions 31 and 31 from the side (see FIG. 5). ).

  Specifically, as shown in FIG. 6A, first, the semicircular body 42 is fitted to the position close to the magnet fixing portion 30 in the ring fitting portion 31, and the ring fixing protrusion 43 of the semicircular body 42 is inserted. , 43 are aligned so as to be coaxial with the ring fixing grooves 33, 33 formed in the end large-diameter portion 32, and then the semicircular body 42 is moved to the end large-diameter portion 32 side (FIG. 6A). ) To the right). The semicircular bodies 42 may be moved one by one, or may be moved after the ends of the pair of semicircular bodies 42 and 42 are brought into contact with each other to form the shaft mounting ring 40.

  Then, as shown in FIG. 6 (B), the ring fixing protrusions 43 and 43 provided in the semicircular bodies 42 and 42 respectively enter the ring fixing grooves 33 and 33 to be engaged with the concave and convex portions. As a result, the pair of semicircular bodies 42 and 42 are combined so as not to be separable outside the ring fitting portions 31 and 31 to form the shaft mounting ring 40, which is non-rotatable and non-detachable with respect to the rotor shaft 16. Fixed.

  At this time, you may fix the shaft mounting ring 40 to the outer surface of the ring fitting parts 31 and 31 with an adhesive agent. Further, a ring-shaped holding member (not shown) is fitted to the ring fitting portion 31, and the shaft mounting rings 40, 40 are connected between the holding member and the magnet fixing portion 30 and between the holding member and the end large-diameter portion. You may make it pinch | interpose between 32. In this way, the shaft mounting rings 40, 40 move in the axial direction, that is, the direction in which the engagement between the ring fixing protrusions 43, 43 and the ring fixing grooves 33, 33 is released (left side in FIG. 3). Is prohibited, and the dropping of the shaft mounting rings 40, 40 can be reliably prevented. Thus, the rotor shaft 16 is completed.

  Next, the segment magnet 20 is attached to the rotor shaft 16. Specifically, for example, a thermosetting adhesive is applied to the outer surface of the magnet fixing portion 30 and / or the inner surface 20A of the segment magnet 20, and the segment magnet 20 is bonded to the outer surface of the magnet fixing portion 30 from the side. To do. At this time, as shown in FIGS. 2 and 3, both end portions of the segment magnet 20 are fitted between the magnet positioning protrusions 41, 41 adjacent to each other formed on the shaft mounting rings 40, 40. Thereby, while positioning so that the some segment magnet 20 may be equally arrange | positioned on the outer peripheral surface of the rotor shaft 16, the position shift of the segment magnet 20 after adhesion | attachment can be prevented.

  Here, when the segment magnet 20 is fixed to the magnet fixing portion 30, the outer peripheral surface of the portion sandwiched between the adjacent magnet positioning protrusions 41, 41 of the shaft mounting rings 40, 40 is caused by the segment magnet 20. Since it is covered (see FIG. 3), the shaft mounting rings 40, 40 can be prevented from falling off. Further, since the portion sandwiched between the adjacent magnet positioning protrusions 41, 41 of the shaft mounting rings 40, 40 is recessed with respect to the outer surface of the magnet fixing portion 30, the inner surface 20A of the segment magnet 20 is fixed to the magnet. Adhering to the outer surface of the portion 30 can be ensured.

  Similarly, when the plurality of segment magnets 20 are sequentially adhered to the outer peripheral surface of the magnet fixing portion 30, the rotor 17 in which the plurality of segment magnets 20 are evenly arranged on the outer peripheral surface of the rotor shaft 16 is completed. The motor 10 is completed by arranging the rotor 17 inside the stator 12 and closing both ends of the cylindrical housing 11.

  Thus, according to this embodiment, since the segment magnet 20 is fitted between the magnet positioning protrusions 41 and 41 adjacent to each other formed on the shaft mounting ring 40, the plurality of segment magnets 20. Can be positioned so that the segment magnets 20 are evenly arranged, and the positional deviation of the segment magnet 20 after attachment can be prevented. Further, since the shaft mounting ring 40 can be divided into two parts in the vertical direction, it can be easily attached to the ring fitting portion 31 having a structure in which the peripheral surface of the rotor shaft 16 is recessed in a groove shape. Further, the ring fixing protrusions 43, 43 formed on the semicircular bodies 42, 42 and the shaft fixing grooves 33, 33 formed on the rotor shaft 16 are engaged with each other, thereby forming a pair of semicircular bodies 42. , 42 can be separated from the outside of the ring fitting portions 31, 31 so as not to be separated, and the shaft mounting ring 40 can be fitted and fixed to the rotor shaft 16 so as not to be rotatable and to be detached. In addition, since the segment magnet 20 is fitted between the magnet positioning protrusions 41 and 41 at two positions in the axial direction (specifically, both ends), the positioning accuracy of the segment magnet 20 is improved, and the position is increased. Misalignment can be prevented more reliably.

[Second Embodiment]
7 to 10 show a second embodiment of the present invention. In the second embodiment, the structure of the shaft mounting ring and the rotor shaft is different from that of the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and duplicate descriptions are omitted.

  As shown in FIG. 7, the rotor shaft 16 ′ of the present embodiment includes a magnet fixing portion 30 ′ having a circular cross section at the axial central portion, and a ring having the same diameter as the magnet fixing portion 30 ′ on both sides thereof. Fitting portions 31 ′ and 31 ′ are provided. Further, on the end side with respect to the ring fitting portions 31 ′ and 31 ′, the end large diameter portions 32 and 32 (in which the outer diameter is increased in a stepped manner with respect to the ring fitting portions 31 ′ and 31 ′) Corresponding to the “ring adjacent large diameter portion” of the present invention). A pair of ring fixing grooves 33 and 33 are formed in the end large diameter portions 32 and 32, respectively. The ring fixing grooves 33, 33 are formed at two positions 180 degrees apart from each other in the circumferential direction of the rotor shaft 16 ', both open to the magnet fixing portion 30' side and the radially outer side of the rotor shaft 16 '. is doing. Note that the inner portions of the ring fixing grooves 33, 33 of the present embodiment are recessed with respect to the outer peripheral surface of the ring fitting portion 31 '.

  As shown in FIG. 8, the shaft mounting ring 50 has a cylindrical structure that is flat in the axial direction, and has a larger width dimension (length in the axial direction) than the wall thickness. The shaft mounting ring 50 can be divided into a pair of semicircular bodies 52, 52. Both end portions 52A, 52A of the semicircular bodies 52, 52 that are joined to each other protrude in one of the axial directions. Ring fixing protrusions 43 and 43 are formed. Further, a plurality (for example, 14 in this embodiment) of magnet positioning protrusions 51 protrude from the end face of the shaft mounting ring 50 on the side opposite to the ring fixing protrusions 43 and 43. These magnet positioning protrusions 51 are provided at equal intervals in the circumferential direction of the shaft mounting ring 50 and extend parallel to each other in the axial direction of the shaft mounting ring 50.

  As shown in FIG. 7, the shaft mounting rings 50, 50 are fitted and fixed to the ring fitting portions 31 ', 31'. Specifically, one end surface of the shaft mounting rings 50 and 50 is abutted against the stepped surface between the end large diameter portions 32 and 32, and the ring fixing protrusions 43 and 43 are connected to the ring fixing grooves 33 and 43. The concave-convex engagement with 33 is performed. Magnet positioning protrusions 51 and 51 formed on the shaft mounting rings 50 and 50 respectively face each other in the axial direction of the rotor shaft 16 ′, and adjacent magnet positioning protrusions 51 of the shaft mounting rings 50 and 50. , 51, the end of the segment magnet 20 is fitted. Here, both end surfaces of the segment magnet 20 are in contact with the end surfaces of the portions sandwiched between the adjacent magnet positioning protrusions 51 and 51 in the shaft mounting rings 50 and 50. That is, the segment magnet 20 is positioned and offset in the axial direction and the circumferential direction of the rotor shaft 16 ′, and the shaft mounting rings 50, 50 are located between the segment magnet 20 and the end large-diameter portions 32, 32. And is fixed in the axial direction.

  The configuration of the motor 10 according to the present embodiment is as described above. Next, a method for manufacturing the motor 10 will be described. First, the two shaft mounting rings 50 and 50 are respectively assembled to the rotor shaft 16 '. That is, the shaft mounting rings 50 and 50 are each divided into two semicircular bodies 52 and 52, and these semicircular bodies 52 and 52 are once fitted into the magnet fixing portion 30 ′ from the side (see FIG. 9). reference).

  Then, after the ring fixing protrusions 43 and 43 are aligned with the ring fixing grooves 33 and 33 at the magnet fixing portion 30 ′ (see FIG. 10A), the semicircular body 52 is aligned. Is moved to the end large diameter portion 32 side (the right side in FIG. 10A). In addition, when moving the semicircle 52 from the magnet fixing | fixed part 30 'to the ring fitting part 31, you may move one by one, but abutting the both ends of a pair of semicircle 52,52 The shaft mounting ring 50 may be moved after the state.

  Then, the ring fixing protrusions 43 and 43 of the shaft mounting ring 50 enter the ring fixing grooves 33 and 33, respectively, and engage with the concave and convex portions (state of FIG. 10B). As a result, the semicircular bodies 52 and 52 are combined so as not to be separated, and the shaft mounting ring 50 is fitted and fixed at the ring fitting portions 31 ′ and 31 ′ so as not to rotate and to be detached. Thus, the rotor shaft 16 'is completed.

  Next, the segment magnet 20 is attached to the rotor shaft 16 '. That is, the segment magnet 20 is bonded to the outer surface of the magnet fixing portion 30 ′ with an adhesive from the side. At this time, both end portions of the segment magnet 20 are fitted between the magnet positioning protrusions 51 and 51 adjacent to each other formed on the shaft mounting rings 50 and 50. Thereby, while positioning so that the some segment magnet 20 may be arrange | positioned equally, the position shift of the segment magnet 20 after adhesion | attachment is prevented. Further, since the shaft mounting rings 50, 50 are sandwiched between the both ends of the segment magnet 20 and the large end portions 32, 32 and fixed in the axial direction (see FIG. 7), the shaft mounting ring 50, 50 is prohibited from moving in the axial direction of the rotor shaft 16 ', that is, in a direction in which the engagement between the ring fixing protrusions 43, 43 and the ring fixing grooves 33, 33 is released, and the shaft mounting ring 50, 50 dropouts can be prevented. Thus, the present embodiment can achieve the same effects as those of the first embodiment.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) The magnet positioning protrusion may be integrally formed on the outer peripheral surface of the rotor shaft 16, 16 '. Here, when forming integrally with the rotor shafts 16 and 16 ′, additional processing such as cutting of the outer peripheral surface of the rotor shafts 16 and 16 ′ is required, but as in the first and second embodiments. If the shaft mounting rings 40 and 50 are integrally formed, there is no need to additionally process the rotor shafts 16 and 16 ', and the magnet positioning protrusions are integrated with the shaft mounting rings 40 and 50 by press molding or sintering molding. Since it can be formed, the magnet positioning protrusion can be provided relatively easily.

  (2) The segment magnet rotor fixing structure may have the following configuration. For example, as shown in FIG. 11, a plurality of pin holes 62 are formed at positions that equally divide the outer peripheral surface of the rotor shaft 60. A press-fit pin 63 is press-fitted into each of the pin holes 62. The press-fit pin 63 is buried inside the pin hole 62 so as not to protrude from the outer surface of the rotor shaft 60. For example, a cylindrical magnet positioning protrusion 61 is integrally formed on the press-fit pin 63. The magnet positioning protrusion 61 is formed coaxially with the press-fit pin 63 and protrudes in the radial direction from the outer peripheral surface of the rotor shaft 60. Then, the segment magnets 20 are fitted between the magnet positioning protrusions 61 and 61 adjacent in the circumferential direction, and the segment magnets 20 are fixed to the outer peripheral surface of the rotor shaft 60 with, for example, an adhesive. . Even in such a configuration, the segment magnet 20 can be positioned and stopped.

  (3) In the first embodiment and the second embodiment, the two shaft mounting rings 40 and 50 having the same structure are mounted on the rotor shafts 16 and 16 '. However, as shown in FIG. Depending on the outer shape, the shaft mounting ring 40 having the configuration described in the first embodiment and the shaft mounting ring 50 having the configuration described in the second embodiment may be combined and mounted. That is, one end of the segment magnet 20 is fitted between the magnet positioning protrusions 41 and 41 formed to protrude from the outer peripheral surface of the shaft mounting ring 40, and the other end is pivoted from the end surface of the shaft mounting ring 50. You may make it fit between the magnet positioning protrusion parts 51 and 51 which protruded in the direction.

  (4) The shaft mounting rings 40 and 50 are not limited to the cylindrical shape as in the first and second embodiments, but according to the outer surface shapes of the ring fitting portions 31 and 31 ′ and the magnet fixing portions 30 and 30 ′. Various changes may be made. For example, when the outer surfaces of the ring fitting portions 31, 31 'are regular polygons, the hole shape of the shaft mounting ring may be the same regular polygon as the cross-sectional shape of the ring fitting portions 31, 31'. In this way, the shaft mounting ring can be prevented from rotating between the inner surface of the shaft mounting ring and the outer surfaces of the ring fitting portions 31, 31 '.

  (5) In the first and second embodiments, the magnet fixing portions 30 and 30 ′ have a circular cross section. However, the magnet fixing portions 30 and 30 ′ have a regular polygonal cross section (for example, the same number as the number of segment magnets 20). A regular polygon having a flat plane).

  (6) The number of shaft mounting rings 40, 50 to be mounted on the rotor shafts 16, 16 'is not limited to two, and may be one or three or more. Further, in the first embodiment, the shaft mounting ring 40 is disposed on both ends of the magnet fixing portion 30 so that both ends of the segment magnet 20 are fitted between the magnet positioning protrusions 41 and 41. However, the shaft mounting ring 40 is attached to, for example, the central portion of the magnet fixing portion 30 so that the central portion of the segment magnet 20 is fitted between the magnet positioning protrusions 41 and 41. It may be.

  (7) If the shaft mounting ring can be inserted from the end of the rotor shaft, the shaft mounting ring may not be divided into two parts.

  (8) In the first and second embodiments, the motor 10 is exemplified as the “rotating machine” of the present invention. However, the present invention may be applied to a generator.

1 is an exploded perspective view of a motor according to a first embodiment of the present invention. Cross section of motor Rotor shaft side view Perspective view of shaft mounting ring Exploded perspective view of rotor shaft Side view of rotor shaft during assembly of shaft mounting ring Side view of rotor shaft according to second embodiment Perspective view of shaft mounting ring Exploded perspective view of rotor shaft Side view of rotor shaft during assembly of shaft mounting ring Partial plane sectional view of a rotor shaft according to another embodiment (2) Side view of rotor shaft according to other embodiment (3)

Explanation of symbols

10 Motor (Rotating machine)
16, 16 ', 60 Rotor shaft 20 Segment magnet 30 Magnet fixing part 31, 31' Ring fitting part 32 End large diameter part (ring adjacent large diameter part)
33 Ring fixing groove 40, 50 Shaft mounting ring 41, 51, 61 Magnet positioning protrusion 42, 52 Semicircular body 43 Ring fixing protrusion 62 Pin hole 63 Press-fit pin

Claims (9)

In the segment magnet rotor fixing structure for evenly arranging and fixing a plurality of segment magnets on the rotor shaft provided in the rotating machine,
A segment magnet rotor fixing, wherein a plurality of magnet positioning protrusions are provided at positions that equally divide the rotor shaft in the circumferential direction, and the segment magnets are fitted between the adjacent magnet positioning protrusions. Construction.   The segment magnet rotor fixing structure according to claim 1, wherein a shaft mounting ring that integrally includes the plurality of magnet positioning protrusions and is fixedly fitted to the outside of the rotor shaft so as not to rotate is provided. The rotor shaft is adjacent to a ring fitting portion where the shaft mounting ring is fitted, and a ring adjacent large diameter portion having a larger outer diameter than the ring fitting portion is formed.
The shaft mounting ring is composed of a pair of semicircles that are fitted to the ring fitting portion from the side and merged with each other,
Ring fixing protrusions protruding toward the ring adjacent large diameter portion are formed at both ends of the semicircles that are abutted against the semicircle on the other side,
3. The segment magnet rotor fixing structure according to claim 2, wherein a ring fixing groove in which the ring fixing protrusion is inserted from an axial direction of the rotor shaft is formed in the ring adjacent large diameter portion. The ring adjacent large diameter portion is provided in pairs with the ring fitting portion interposed therebetween,
The segment magnet is disposed so as to cover at least one of the ring adjacent large diameter part and the outer peripheral surface of the ring fitting part,
The width of the ring fitting portion is larger than the total axial length of the shaft mounting ring including the ring fixing protrusion,
The shaft mounting ring is disposed near one of the ring fitting portions adjacent to the large diameter portion of the ring, and the ring fixing protrusion is inserted into the ring fixing groove formed in the one ring adjacent large diameter portion. ,
The segment magnet rotor fixing structure according to claim 3, wherein the magnet positioning protrusion is formed so as to protrude in a radial direction from an outer peripheral surface of the shaft mounting ring.   The segment according to claim 4, wherein an outer diameter of a portion sandwiched between adjacent magnet positioning protrusions of the shaft mounting ring is smaller than an outer diameter of the large diameter portion adjacent to the ring. Magnet rotor fixed structure. The ring fitting portion is arranged at the end of the magnet fixing portion to which the segment magnet is mounted in the rotor shaft and has the same diameter as the magnet fixing portion.
The ring adjacent large diameter portion is disposed on the opposite side of the magnet fixing portion with the ring fitting portion interposed therebetween,
The segment magnet rotor fixing structure according to claim 3, wherein the magnet positioning protrusion protrudes from the end surface of the shaft mounting ring to the opposite side of the ring fixing protrusion.   The segment magnet rotor fixing structure according to claim 6, wherein the shaft mounting ring is fixed in the axial direction by being sandwiched between the segment magnet and the ring adjacent large diameter portion. A plurality of pin holes are formed at positions that equally divide the outer peripheral surface of the rotor shaft, and a plurality of press-fit pins that are press-fitted into the pin holes and disposed inside the pin holes from the outer peripheral surface of the rotor shaft are provided. ,
2. The segment magnet rotor fixing structure according to claim 1, wherein the magnet positioning protrusion is integrally formed on one end coaxially with the press-fit pin and protrudes in a radial direction from an outer peripheral surface of the rotor shaft.   A rotating machine having the segment magnet rotor fixing structure according to any one of claims 1 to 8.

Images