JP2013009458A - Rotor and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor capable of ensuring the fixing strength of permanent magnets onto a rotary body even if the permanent magnets are moved in the axial direction while the permanent magnets are bonded and fixed to the rotary body.SOLUTION: A rotor comprises: a rotary body made up of a rotary shaft and a laminate core 7; and a plurality of permanent magnets 8 which are fixed to an outer circumferential face of the laminate core 7 so as to be adjacent to one another in a circumferential direction of the rotary body. On the outer circumferential face of the laminate core 7, a plurality of projections 7a and 7b coming into contact with a fixing face 8a of each of the permanent magnets 8 are formed so as to project outward in the radial direction. Recesses 7c formed between the projections 7a and 7b serve as adhesive reservoirs for collecting adhesive provided to fix the permanent magnets 8 onto the outer circumferential face of the laminate core 7.

Description

  The present invention relates to a rotor used in a motor. The invention also relates to a motor comprising such a rotor.

  Conventionally, a permanent magnet type motor including a rotor having a permanent magnet and a stator disposed on the outer peripheral side of the rotor is known (see, for example, Patent Document 1). In the motor described in Patent Document 1, the stator includes a stator core having a plurality of teeth projecting inward in the radial direction, and a driving coil wound around the teeth. The rotor includes a rotation shaft, an iron core fixed to the outer peripheral surface of the rotation shaft, and four permanent magnets fixed to the outer peripheral surface of the iron core. The four permanent magnets are fixed to the outer peripheral surface of the iron core so as to be adjacent to each other in the circumferential direction of the rotor. Each permanent magnet is divided into three in the axial direction of the rotor, and is composed of three magnet pieces.

JP 2005-354899 A

  In the motor and the like described in Patent Document 1, generally, the permanent magnet is fixed to the outer peripheral surface of the iron core by adhesion. Specifically, with the adhesive applied to the outer peripheral surface of the iron core or the inner surface of the permanent magnet, the permanent magnet is brought into contact with the outer peripheral surface of the iron core by bringing the outer peripheral surface of the iron core into contact with the permanent magnet. Fixed. Here, when the permanent magnet is constituted by a plurality of magnet pieces divided in the axial direction as in the motor described in Patent Document 1, when the permanent magnet is bonded and fixed, the outer peripheral surface of the iron core or the magnet When the outer peripheral surface of the iron core and the magnet piece are brought into contact with each other with the adhesive applied to the inner surface of the piece, a repulsive force is generated between the magnet pieces in the axial direction, and the magnet piece is moved from the original mounting position. It may shift in the axial direction. In this case, it is necessary to move the displaced magnet piece back to the original mounting position.

  However, in the motor described in Patent Document 1, when the magnet piece displaced in the axial direction is returned to the original mounting position, the adhesive applied to the outer peripheral surface of the iron core or the inner side surface of the magnet piece is magnetized in the axial direction. There is a case where it is scraped off by the end face of the piece and does not remain on the outer peripheral face of the iron core or the inner face of the magnet piece. In this case, the fixing strength of the permanent magnet cannot be secured, and the permanent magnet may come off the iron core.

  Therefore, an object of the present invention is to provide a rotor capable of securing the fixing strength of the permanent magnet to the rotating body even when the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the rotating body. Is to provide. Moreover, the subject of this invention is providing a motor provided with this rotor.

  In order to solve the above problems, a rotor according to the present invention is a rotor used in a motor, and a plurality of permanent magnets fixed to the outer peripheral surface of the rotating body so as to be adjacent to the rotating body in the circumferential direction A plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the outer peripheral surface of the rotating body so as to protrude outward in the radial direction of the rotating body. It is an adhesive reservoir that stores an adhesive for fixing the permanent magnet to the outer peripheral surface of the rotating body.

  In the rotor of the present invention, the plurality of protrusions that contact the fixed surface of the permanent magnet are formed on the outer peripheral surface of the rotating body so as to protrude outward in the radial direction of the rotating body, and the recess formed between the protrusions is In addition, an adhesive reservoir is provided for storing an adhesive for fixing the permanent magnet to the outer peripheral surface of the rotating body. Therefore, even if the permanent magnet is moved in the axial direction of the rotor after the fixing surface of the permanent magnet is brought into contact with the protruding portion with the adhesive applied to the outer peripheral surface of the rotating body or the fixing surface of the permanent magnet, the concave portion It is possible to prevent the adhesive accumulated in the surface from being scraped off by the end face of the permanent magnet in the axial direction. Therefore, in the present invention, even when the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the outer peripheral surface of the rotating body, the permanent magnet is fixed to the rotating body by the adhesive accumulated in the recess. It becomes possible to ensure strength.

  In the present invention, the width of the recess in the circumferential direction is preferably wider than the width of the protrusion in the circumferential direction. If comprised in this way, it will become possible to increase the quantity of the adhesive agent which accumulates in a recessed part, and to raise the fixed strength of the permanent magnet to a rotary body.

  In this invention, it is preferable that the permanent magnet is comprised by the several magnet piece divided | segmented into the axial direction of a rotary body. If comprised in this way, it will become possible to reduce the eddy current loss which arises in a permanent magnet. On the other hand, when the permanent magnet is constituted by a plurality of magnet pieces, the magnet piece moved in the axial direction is moved by the influence of the repulsive force generated between the magnet pieces when the magnet pieces are bonded and fixed as described above. However, in the present invention, it is possible to prevent the adhesive from being scraped off by the end surface of the magnet piece in the axial direction. .

  In the present invention, a gap is formed between permanent magnets adjacent in the circumferential direction, and a second adhesive is applied to the gap, and the permanent magnet adjacent in the circumferential direction is applied by the second adhesive. Are preferably fixed to each other. If comprised in this way, it will become possible to raise the fixed strength of the permanent magnet to a rotary body with a 2nd adhesive agent.

  In the present invention, on the outer peripheral surface of the rotating body, as a protrusion, an end surface side protrusion that abuts both ends of the fixed surface of the permanent magnet in the circumferential direction and an intermediate portion between the fixed surface of the permanent magnet in the circumferential direction. It is preferable that an intermediate projecting portion with which the position abuts is formed. If comprised in this way, it will become possible to perform positioning of the permanent magnet in a radial direction appropriately by three projection parts.

  In the present invention, the outer peripheral surface of the rotating body is disposed between the permanent magnets adjacent in the circumferential direction, and a contact portion capable of contacting the end surface of the permanent magnet in the circumferential direction extends outward in the radial direction. Preferably, the end surface of the permanent magnet in the circumferential direction is in contact with the contact portion. If comprised in this way, it will become possible to perform positioning of the permanent magnet in the circumferential direction appropriately by the contact part.

  In this invention, it is preferable that the end surface of the one direction side in the circumferential direction of all the permanent magnets is contact | abutting to the contact part. If comprised in this way, if the contact part is formed in the circumferential direction at fixed intervals, it will become possible to suppress the dispersion | variation in the space | interval of the circumferential direction of the permanent magnet adjacent in the circumferential direction. Therefore, it is possible to improve the rotational characteristics of the rotor.

  In the present invention, for example, the fixed surface of the permanent magnet disposed on the radially inner side is formed in a concave curved surface, and the outer surface of the permanent magnet disposed on the radially outer side is formed in a convex curved surface, The permanent magnet is formed to have a substantially crescent shape in which the radius of curvature of the fixed surface of the permanent magnet is larger than the radius of curvature of the outer surface of the permanent magnet when viewed from the axial direction of the rotating body. In this case, it is preferable that the rotor includes a tape that is wound and fixed along the circumscribed circle of the outer surfaces of the plurality of permanent magnets when viewed from the axial direction. If comprised in this way, it will become possible to suppress the windage loss and noise which may be produced by the unevenness | corrugation of the permanent magnet fixed to the outer peripheral surface of a rotary body.

  In the present invention, in the circumferential direction, the winding start end of the tape and the winding end end of the tape are arranged on the outer peripheral side of the same permanent magnet, and the permanent magnet on which the winding start end and the winding end end are arranged is the first permanent magnet. When the magnet is used, the winding start end is disposed on the inner side of the circumscribed circle in the radial direction, and on the upstream side of the contact portion between the outer surface of the first permanent magnet and the circumscribed circle in the winding direction of the tape. It is preferable that the winding end is disposed in the vicinity of the upstream end of the contact portion in the tape winding direction. If comprised in this way, it will become possible to make the thickness of the tape wound so that the circumscribed circle of the outer surface of a some permanent magnet may be followed substantially constant. Therefore, it is possible to effectively suppress windage loss and noise that may be caused by the unevenness of the permanent magnet.

  In the present invention, the rotating body includes a laminated core formed by laminating a plurality of magnetic plates in the axial direction of the rotating body, and the laminated core constitutes an outer peripheral side portion of the rotating body and an outer peripheral surface of the laminated core It is preferable that a plurality of protrusions are formed on the surface. If comprised in this way, it will become possible to reduce the eddy current loss of a rotary body.

  In order to solve the above problems, a rotor according to the present invention is a rotor used in a motor, and the inner surface of the rotating body is adjacent to the rotating body formed in a substantially cylindrical shape in the circumferential direction of the rotating body. A plurality of permanent magnets fixed to the peripheral surface, and a plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the inner peripheral surface of the rotating body so as to protrude inward in the radial direction of the rotating body. The recess formed between the protrusions is an adhesive reservoir for storing an adhesive for fixing the permanent magnet to the inner peripheral surface of the rotating body.

  In the rotor of the present invention, a plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the inner peripheral surface of the rotating body so as to protrude inward in the radial direction of the rotating body, and the recesses formed between the protrusions Is an adhesive reservoir in which an adhesive for fixing the permanent magnet to the inner peripheral surface of the rotating body is accumulated. Therefore, even after moving the permanent magnet in the axial direction of the rotor, after contacting the fixed surface of the permanent magnet with the protrusion in a state where the adhesive is applied to the inner peripheral surface of the rotating body or the fixed surface of the permanent magnet, It is possible to prevent the adhesive accumulated in the recess from being scraped off by the end face of the permanent magnet in the axial direction. Therefore, in the present invention, even when the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the inner peripheral surface of the rotating body, the adhesive accumulated in the concave portion causes the permanent magnet to adhere to the rotating body. It becomes possible to ensure the fixing strength.

  The rotor of the present invention can be used for a motor including a stator. In this motor, even when the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the rotating body, the fixing strength of the permanent magnet to the rotating body can be secured.

  As described above, in the rotor and motor of the present invention, the permanent magnet is secured to the rotating body even when the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the rotating body. It becomes possible.

It is sectional drawing of the motor concerning embodiment of this invention. It is a figure which shows a motor from the EE direction of FIG. FIG. 3 is a plan view of the rotor shown in FIG. 2. FIG. 4 is a plan view of the laminated core shown in FIG. 3. It is an enlarged view of the F section of FIG. (A) is an enlarged view of the G part of FIG. 5, (B) is an enlarged view of the H part of FIG. 5, and (C) is an enlarged view of the J part of FIG. It is a figure for demonstrating the fixing method of the permanent magnet to the laminated core shown in FIG. FIG. 4 is an enlarged view of a portion K in FIG. 3.

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

(General configuration of motor)
FIG. 1 is a cross-sectional view of a motor 1 according to an embodiment of the present invention. FIG. 2 is a diagram illustrating the motor 1 from the EE direction in FIG. 1.

  The motor 1 of this embodiment is an inner rotor type motor, and includes a rotor 2, a stator 3 disposed on the outer peripheral side of the rotor 2, and a motor case 4 as shown in FIG. 1. In the following description, the radial direction of the motor 1 (that is, the radial direction of the rotor 2 and the radial direction of the stator 3) is referred to as “radial direction”, and the circumferential direction of the motor 1 (that is, the circumferential direction of the rotor 2 and the stator). 3 is defined as “circumferential direction”, and the axial direction of the motor 1 (that is, the axial direction of the rotor 2 and the axial direction of the stator 3) is defined as “axial direction”.

  The rotor 2 includes a rotating shaft 6, a laminated core 7 fixed to the outer peripheral surface of the rotating shaft 6, and a plurality of permanent magnets 8 fixed to the outer peripheral surface of the laminated core 7. The rotating shaft 6 is rotatably supported by bearings 9 and 10 fixed to the motor case 4. The detailed configuration of the rotor 2 will be described later.

  The stator 3 includes a stator core 13 having a plurality of salient poles 13a and a driving coil 14 wound around each of the plurality of salient poles 13a. The stator core 13 includes an outer peripheral portion 13b that constitutes an outer peripheral portion of the stator core 13 in addition to the plurality of salient poles 13a. The outer peripheral portion 13b is formed in a substantially cylindrical shape, and the plurality of salient poles 13a are formed so as to protrude radially inward from the outer peripheral portion 13b. The stator core 13 of this embodiment includes 18 salient poles 13a.

  Moreover, the stator core 13 is comprised by the some division | segmentation core 15 which can be divided | segmented for every salient pole 13a in the circumferential direction. The split core 15 is a laminated core formed by laminating a plurality of magnetic plates. The plurality of divided cores 15 are shrink-fitted and integrated on the inner peripheral side of a cylindrical member 21 formed in a cylindrical shape in a state of being combined in the circumferential direction. The surface of the split core 15 is covered with resin except for a predetermined part. The drive coil 14 is wound around a salient pole 13a covered with resin. The cylindrical member 21 of this embodiment constitutes a part of the stator 3 and also constitutes the side surface of the motor case 4.

(Configuration of rotor)
FIG. 3 is a plan view of the rotor 2 shown in FIG. FIG. 4 is a plan view of the laminated core 7 shown in FIG. FIG. 5 is an enlarged view of a portion F in FIG. 6A is an enlarged view of the G portion in FIG. 5, FIG. 6B is an enlarged view of the H portion in FIG. 5, and FIG. 6C is an enlarged view of the J portion in FIG. FIG. 7 is a view for explaining a method of fixing the permanent magnet 8 to the laminated core 7 shown in FIG. FIG. 8 is an enlarged view of a portion K in FIG.

  As described above, the rotor 2 includes the rotating shaft 6, the laminated core 7, and the plurality of permanent magnets 8. The rotor 2 of this embodiment includes 16 permanent magnets 8. The laminated core 7 is formed by laminating a plurality of magnetic plates. The laminated core 7 is formed in a cylindrical shape. The laminated core 7 is fixed to the outer peripheral surface of the rotating shaft 6 by shrink fitting, for example. In this embodiment, a rotating body is constituted by the rotating shaft 6 and the laminated core 7, and the laminated core 7 constitutes an outer peripheral side portion of the rotating body. In the following description, the clockwise direction in FIG. 3 is “clockwise”, and the counterclockwise direction in FIG. 3 is “counterclockwise”.

  The permanent magnet 8 is a magnet having a high magnetic flux density and a very strong magnetic force, such as a neodymium magnet. The permanent magnet 8 includes a concave curved fixed surface 8a disposed inside in the radial direction, a convex curved outer surface 8b disposed outside in the radial direction, and a planar shape disposed at both ends in the circumferential direction. End face 8c (see FIG. 5). Further, as shown in FIG. 3, the permanent magnet 8 is formed so as to have a substantially crescent shape in which the curvature radius of the fixed surface 8a is larger than the curvature radius of the outer surface 8b when viewed from the axial direction. In this embodiment, the permanent magnet 8 is magnetized so that the magnetic poles of the fixed surface 8a and the outer surface 8b are different. Moreover, the permanent magnet 8 is comprised by the three magnet pieces 24 divided | segmented into an axial direction, as shown in FIG.

  The permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7 so as to be adjacent in the circumferential direction. Further, the permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7 at substantially constant intervals in the circumferential direction. A gap is formed between the permanent magnets 8 adjacent in the circumferential direction. Further, the three magnet pieces 24 constituting the permanent magnet 8 are fixed to the outer peripheral surface of the laminated core 7 in a state of being in contact with each other in the axial direction. The outer surface 8 b of the permanent magnet 8 is disposed to face the tip surface of the salient pole 13 a of the stator core 13.

  As shown in FIGS. 5 and 6, a plurality of protrusions 7 a and 7 b with which the fixed surface 8 a of the permanent magnet 8 abuts are formed on the outer peripheral surface of the laminated core 7 so as to protrude outward in the radial direction. . Specifically, a protrusion 7a as an end surface side protrusion that contacts both ends of the fixing surface 8a in the circumferential direction, and a protrusion as an intermediate protrusion that contacts an intermediate position of the fixing surface 8a in the circumferential direction. The part 7b is formed on the outer peripheral surface of the laminated core 7, and the fixed surface 8a of one permanent magnet 8 is in contact with the three protrusions 7a and 7b.

  The protrusions 7a and 7b are formed in a flat, substantially rectangular parallelepiped shape that slightly protrudes outward in the radial direction (for example, approximately 0.1 mm). The width of the protrusion 7a in the circumferential direction is wider than the width of the protrusion 7b in the circumferential direction. Further, the width of the recess 7c formed between the protrusion 7a and the protrusion 7b in the circumferential direction is wider than the width of the protrusions 7a and 7b in the circumferential direction. Specifically, the circumferential width of the recess 7c is at least twice the circumferential width of the protrusion 7a. In this embodiment, the circumferential width of the recess 7c is about four times the circumferential width of the protrusion 7a.

  In addition, the surface (radial outer surface) of the projections 7a and 7b of this embodiment is formed so that the shape when viewed from the axial direction is an arc. The surface of the recess 7c (the bottom surface of the recess 7c in the radial direction) is also formed so that the shape when viewed from the axial direction is an arc. The depth of the concave portion 7c in the radial direction is substantially constant, and the distance between the surface of the concave portion 7c and the fixed surface 8a of the permanent magnet 8 is substantially constant.

  In addition, a contact portion 7 d with which the end face 8 c of the permanent magnet 8 can contact is formed on the outer peripheral surface of the laminated core 7 so as to protrude outward in the radial direction. 7 d of contact parts are formed in the outer peripheral surface of the lamination | stacking core 7 by the substantially constant space | interval in the circumferential direction, and are arrange | positioned between the permanent magnets 8 adjacent in the circumferential direction. The contact portion 7d is formed in a substantially rectangular parallelepiped shape that protrudes outward in the radial direction from the protrusions 7a and 7b. The interval between the contact portions 7d in the circumferential direction is wider than the width of the permanent magnet 8 in the circumferential direction, and one end surface 8c of the permanent magnet 8 is in the circumferential direction as shown in FIG. The abutment portion 7d is in contact with one of the contact portions 7d disposed on both sides of the permanent magnet 8. In this embodiment, the end surfaces 8c on one side in the circumferential direction of all the permanent magnets 8 are in contact with the contact portion 7d. For example, in this embodiment, the end surfaces 8c on the counterclockwise side of all the permanent magnets 8 are in contact with the contact portion 7d.

  The permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7 by adhesion. Specifically, the fixing surface 8a is formed on the protrusion 7a with an adhesive (for example, a thermosetting adhesive having a relatively low viscosity) applied to the outer peripheral surface of the laminated core 7 or the fixing surface 8a of the permanent magnet 8. The permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7 by bringing the adhesive into contact with 7b and curing the adhesive. The concave portion 7 c of the laminated core 7 is an adhesive reservoir in which an adhesive for fixing the permanent magnet 8 to the outer peripheral surface of the laminated core 7 is accumulated. In this embodiment, the magnetized permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7.

  Further, as shown in FIG. 3, an adhesive 25 as a second adhesive is applied to a gap formed between the permanent magnets 8 adjacent in the circumferential direction. Specifically, the adhesive covers the end portion of the outer surface 8b of the permanent magnet 8 adjacent in the circumferential direction and covers the contact portion 7d and the end surface 8c of the permanent magnet 8 from the outer side in the radial direction. The permanent magnets 8 adjacent to each other in the circumferential direction are fixed to each other by the adhesive 25. The adhesive 25 is an adhesive having a relatively high viscosity. As shown in FIG. 5, the height of the end face 8c of the permanent magnet 8 in the radial direction is higher than the height of the contact portion 7d in the radial direction. Therefore, in this embodiment, it is possible to secure the bonding surface of the adhesive 25 and secure the fixing strength between the permanent magnets 8 adjacent in the circumferential direction.

  In addition, the permanent magnet 8 of this form is comprised by the three magnet pieces 24, and when fixing the permanent magnet 8 to the outer peripheral surface of the lamination | stacking core 7, three magnet pieces 24 are fixed together. . When the three magnet pieces 24 are fixed together on the outer peripheral surface of the laminated core 7, a repulsive force is generated between the magnet pieces 24, and the magnet pieces 24 are mutually connected in the axial direction as shown in FIG. Move away. In this case, using a predetermined jig, as shown in FIG. 7B, the magnet pieces 24 are moved in the axial direction to bring the three magnet pieces 24 into contact with each other in the axial direction. Note that an adhesive may be applied to the contact surfaces of the magnet pieces 24 that contact each other in the axial direction.

  As shown in FIG. 3, the outer peripheral side of the permanent magnet 8 is covered with a tape 26. The tape 26 is, for example, a thermosetting glass cloth tape. The tape 26 is wound and fixed so as to follow a circumscribed circle 27 (see FIG. 8) of the outer surface 8b of the plurality of permanent magnets 8. In this embodiment, the tape 26 is wound counterclockwise. In this embodiment, the tape 26 is wound twice so as to follow the circumscribed circle 27.

  As shown in FIG. 8, the winding start end 26 a and the winding end end 26 b of the tape 26 are arranged on the outer peripheral side of the same permanent magnet 8 in the circumferential direction. When the permanent magnet 8 on which the winding start end 26a and the winding end end 26b are arranged is the first permanent magnet 8A, the winding start end 26a is arranged on the inner side of the circumscribed circle 27 in the radial direction, and the first permanent magnet 8A. The magnet 8A and the circumscribed circle 27 are arranged on the clockwise side (that is, on the upstream side in the counterclockwise direction, which is the winding direction of the tape 26), with respect to the contact part 8d. Further, the winding start end 26a side of the tape 26 is in contact with an inner portion of the outer surface 8b with respect to the circumscribed circle 27, and is fixed to this portion. On the other hand, the winding end 26b is disposed in the vicinity of the clockwise end (that is, the upstream end in the counterclockwise direction that is the winding direction of the tape 26) 8e of the contact portion 8d. Specifically, the winding end 26b is disposed slightly on the clockwise side with respect to the clockwise end 8e of the contact portion 8d. Therefore, the winding end 26b is disposed at a position lower than the apex of the outer surface 8b in the radial direction, and the tape 26 has been wound at a position lower than the apex of the outer surface 8b in the radial direction.

(Main effects of this form)
As described above, in this embodiment, a plurality of protrusions 7a and 7b with which the fixed surface 8a of the permanent magnet 8 abuts are formed on the outer peripheral surface of the laminated core 7, and between the protrusions 7a and 7b. The formed recess 7 c is an adhesive reservoir in which an adhesive for fixing the permanent magnet 8 to the outer peripheral surface of the laminated core 7 is accumulated. Therefore, due to the repulsive force generated between the magnet pieces 24 when the permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7, the magnet pieces 24 separated from each other in the axial direction as shown in FIG. As shown in (B), even if the magnet pieces 24 are moved in the axial direction so as to contact each other in the axial direction, the adhesive accumulated in the recesses 7c is scraped off by the end surfaces of the magnet pieces 24 in the axial direction. Can be prevented. Therefore, in this embodiment, even when the magnet piece 24 is moved in the axial direction when the permanent magnet 8 is bonded and fixed to the outer peripheral surface of the laminated core 7, the adhesive accumulated in the concave portion 7 c causes the laminated core 7 to move to the laminated core 7. It becomes possible to ensure the fixing strength of the permanent magnet 8.

  In particular, in this embodiment, the width of the recess 7c in the circumferential direction is wider than the width of the protrusions 7a and 7b in the circumferential direction. Therefore, in this embodiment, it is possible to increase the amount of adhesive that accumulates in the recess 7 c and increase the fixing strength of the permanent magnet 8 to the laminated core 7. Further, in this embodiment, the adhesive 25 is applied to the gaps between the permanent magnets 8 adjacent in the circumferential direction, and the permanent magnets 8 adjacent in the circumferential direction are fixed to each other by the adhesive 25. The adhesive 25 can increase the fixing strength of the permanent magnet 8 to the laminated core 7.

  In this embodiment, protrusions 7 a and 7 b are formed on the outer peripheral surface of the laminated core 7. Therefore, in this embodiment, it becomes possible to appropriately position the permanent magnet 8 in the radial direction by the three protrusions 7a and 7b. In this embodiment, one end face 8c of the permanent magnet 8 in the circumferential direction is in contact with one of the contact portions 7d disposed on both sides of the permanent magnet 8 in the circumferential direction. Therefore, in this embodiment, it becomes possible to appropriately position the permanent magnet 8 in the circumferential direction by the contact portion 7d.

  In this embodiment, the end surfaces 8c on one side in the circumferential direction of all the permanent magnets 8 are in contact with the contact portion 7d. The contact portions 7d are formed at substantially constant intervals in the circumferential direction. Therefore, it is possible to suppress variation in the circumferential interval between the permanent magnets 8 adjacent in the circumferential direction. Therefore, in this embodiment, it is possible to improve the rotation characteristics of the rotor 2.

  In this embodiment, the tape 26 is wound along the circumscribed circle 27 of the outer surface 8 b of the plurality of permanent magnets 8. Therefore, in this embodiment, even if irregularities are formed on the outer peripheral surface of the rotor 2 by the permanent magnet 8 having a substantially crescent shape when viewed from the axial direction, the windage loss that may occur due to the irregularities on the outer peripheral surface of the rotor 2 And noise can be suppressed by the tape 26.

  In this embodiment, in the circumferential direction, the winding start end 26a and the winding end end 26b of the tape 26 are disposed on the outer peripheral side of the same first permanent magnet 8A. In addition, the winding start end 26a is disposed on the inner side of the circumscribed circle 27 in the radial direction, and is disposed on the clockwise side of the contact portion 8d between the first permanent magnet 8A and the circumscribed circle 27, and the winding end end 26b is arranged in the vicinity of the clockwise end 8e of the contact portion 8d. Therefore, it is possible to suppress the generation of a step in the tape 26 wound along the circumscribed circle 27 and to make the thickness of the tape 26 wound along the circumscribed circle 27 substantially constant. Become. Therefore, in this embodiment, the tape 26 can effectively suppress windage loss and noise that may be caused by the unevenness of the outer peripheral surface of the rotor 2.

  In this embodiment, the laminated core 7 is fixed to the outer peripheral surface of the rotating shaft 6. Therefore, in this embodiment, it becomes possible to reduce the eddy current loss of the rotating body constituted by the rotating shaft 6 and the laminated core 7. Further, in the present embodiment, the permanent magnet 8 is constituted by the three magnet pieces 24 divided in the axial direction, so that it is possible to reduce eddy current loss generated in the permanent magnet 8.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the embodiment described above, the permanent magnet 8 is formed so as to have a substantially crescent shape when viewed from the axial direction. However, the permanent magnet 8 has a substantially arcuate curved plate shape or a substantially rectangular flat plate shape. May be formed. Moreover, in the form mentioned above, although the permanent magnet 8 is comprised by the three magnet pieces 24, the permanent magnet 8 may be comprised by the two magnet pieces 24, and four or more magnet pieces. 24 may be comprised. Further, the permanent magnet 8 may be constituted by a single magnet piece 24. Even when the permanent magnet 8 is constituted by a single magnet piece 24, when the permanent magnet 8 is bonded and fixed to the laminated core 7, the position of the permanent magnet 8 in the axial direction is adjusted. 7 may be moved in the axial direction after the fixing surface 8a is brought into contact with the protrusions 7a and 7b in a state where an adhesive is applied to the outer peripheral surface 7 and the fixing surface 8a of the permanent magnet 8.

  In the embodiment described above, the magnetized permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7. In addition, for example, the permanent magnet 8 may be magnetized after the non-magnetized permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7.

  In the embodiment described above, the laminated core 7 is fixed to the outer peripheral surface of the rotating shaft 6, and the permanent magnet 8 is fixed to the outer peripheral surface of the laminated core 7. In addition, for example, the permanent magnet 8 may be directly fixed to the outer peripheral surface of the rotating shaft 6. In this case, a rotating body is constituted by the rotating shaft 6. Further, a sleeve may be fixed to the outer peripheral surface of the rotating shaft 6, and the permanent magnet 8 may be fixed to the outer peripheral surface of the sleeve. In this case, a rotating body is constituted by the rotating shaft 6 and the sleeve. Further, a sleeve may be fixed to the outer peripheral surface of the rotating shaft 6, the laminated core 7 may be fixed to the outer peripheral surface of the sleeve, and the permanent magnet 8 may be fixed to the outer peripheral surface of the laminated core 7. In this case, the rotating shaft 6, the sleeve, and the laminated core 7 constitute a rotating body.

  In the embodiment described above, the plurality of protrusions 7 a and 7 b are formed on the outer peripheral surface of the laminated core 7 so that the three protrusions 7 a and 7 b come into contact with the fixed surface 8 a of the permanent magnet 8. In addition to this, for example, a plurality of protrusions may be formed on the outer peripheral surface of the laminated core 7 so that two protrusions abut each of the fixing surfaces 8 a of the permanent magnet 8. A plurality of protrusions may be formed on the outer peripheral surface of the laminated core 7 so that four or more protrusions abut each of the surfaces 8a.

  In the embodiment described above, the circumferential width of the recess 7c is wider than the circumferential width of the protrusions 7a and 7b. In addition to this, for example, the circumferential width of the concave portion 7c may be equal to the circumferential width of the protruding portion 7a or the protruding portion 7b, or from the circumferential width of the protruding portion 7a or the protruding portion 7b. It may be narrow.

  In the embodiment described above, the end face 8c (end face 8c on the counterclockwise direction) in one circumferential direction of all the permanent magnets 8 is in contact with the contact portion 7d. In addition to this, for example, a permanent magnet 8 whose end surface 8c (counterclockwise end surface 8c) in the circumferential direction is in contact with the contact portion 7d, and an end surface 8c in the other direction in the circumferential direction. There may be a permanent magnet 8 whose (clockwise end surface 8c) is in contact with the contact portion 7d.

  In the embodiment described above, the rotor 2 is used for the inner rotor type motor 1. However, the rotor to which the present invention is applied may be used for an outer rotor type motor. In this case, the rotor includes a rotating body formed in a substantially cylindrical shape and a plurality of permanent magnets fixed to the inner peripheral surface of the rotating body so as to be adjacent in the circumferential direction of the rotating body. In addition, a plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the inner peripheral surface of the rotating body so as to protrude inward in the radial direction of the rotating body. It is an adhesive reservoir in which an adhesive for fixing the magnet to the inner peripheral surface of the rotating body is accumulated. Even in this case, the same effect as that of the above-described embodiment can be obtained. In other words, even if the permanent magnet is moved in the axial direction when the permanent magnet is bonded and fixed to the inner peripheral surface of the rotating body, the fixing strength of the permanent magnet to the rotating body is secured by the adhesive accumulated in the recess. It becomes possible to do.

1 Motor 2 Rotor 3 Stator 6 Rotating shaft (part of rotating body)
7 Laminated core (part of rotating body)
7a Protrusion (end face side protrusion)
7b Projection (intermediate projection)
7c Concave portion 7d Contact portion 8 Permanent magnet 8A First permanent magnet 8a Fixed surface 8b Outer side surface 8c End surface 8d Contact portion 8e Clockwise end (upstream end of contact portion)
24 Magnet piece 25 Adhesive (second adhesive)
26 tape 26a winding start end 26b winding end end 27 circumscribed circle

Claims (13)

In rotors used for motors,
A rotating body, and a plurality of permanent magnets fixed to the outer peripheral surface of the rotating body so as to be adjacent in the circumferential direction of the rotating body,
A plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the outer peripheral surface of the rotating body so as to protrude outward in the radial direction of the rotating body,
The rotor formed by the recessed part formed between the said protrusion parts becomes the adhesive agent pool which the adhesive agent for fixing the said permanent magnet to the said outer peripheral surface of the said rotary body accumulates.   The rotor according to claim 1, wherein a width of the concave portion in the circumferential direction is wider than a width of the protrusion in the circumferential direction.   The rotor according to claim 1, wherein the permanent magnet includes a plurality of magnet pieces that are divided in the axial direction of the rotating body. A gap is formed between the permanent magnets adjacent in the circumferential direction,
A second adhesive is applied to the gap,
The rotor according to claim 1, wherein the permanent magnets adjacent in the circumferential direction are fixed to each other by the second adhesive.   On the outer peripheral surface of the rotating body, as the protrusions, end surface side protrusions with which both end sides of the fixed surface of the permanent magnet in the circumferential direction abut, and the permanent magnets in the circumferential direction of the permanent magnet The rotor according to any one of claims 1 to 4, wherein an intermediate projecting portion with which an intermediate position of the fixed surface abuts is formed. The outer peripheral surface of the rotating body is disposed between the circumferentially adjacent permanent magnets, and a contact portion capable of contacting the end surface of the permanent magnet in the circumferential direction is the radial direction. Is formed so as to protrude outward,
The rotor according to claim 1, wherein the end face of the permanent magnet in the circumferential direction is in contact with the contact portion.   The rotor according to claim 6, wherein the end faces of all the permanent magnets on one side in the circumferential direction are in contact with the contact portion. The fixed surface of the permanent magnet disposed inside the radial direction is formed in a concave curved surface shape,
The outer surface of the permanent magnet arranged on the outer side in the radial direction is formed in a convex curved surface shape,
The permanent magnet is formed to have a substantially crescent shape in which the radius of curvature of the fixed surface of the permanent magnet is larger than the radius of curvature of the outer surface of the permanent magnet when viewed from the axial direction of the rotating body. The rotor according to claim 1, wherein the rotor is provided.   The rotor according to claim 8, further comprising a tape that is wound and fixed along a circumscribed circle of the outer surface of the plurality of permanent magnets when viewed from the axial direction. In the circumferential direction, the winding start end of the tape and the winding end end of the tape are arranged on the outer peripheral side of the same permanent magnet,
When the permanent magnet on which the winding start end and the winding end end are arranged is a first permanent magnet,
The winding start end is disposed on the inner side of the circumscribed circle in the radial direction, and more than the contact portion between the outer surface of the first permanent magnet and the circumscribed circle in the winding direction of the tape. Placed upstream,
The rotor according to claim 9, wherein the winding end is disposed in the vicinity of the upstream end of the contact portion in the winding direction of the tape. The rotating body includes a laminated core formed by laminating a plurality of magnetic plates in the axial direction of the rotating body,
The laminated core constitutes an outer peripheral side portion of the rotating body,
The rotor according to any one of claims 1 to 10, wherein a plurality of the protrusions are formed on an outer peripheral surface of the laminated core. In rotors used for motors,
A rotating body formed in a substantially cylindrical shape, and a plurality of permanent magnets fixed to the inner peripheral surface of the rotating body so as to be adjacent in the circumferential direction of the rotating body,
A plurality of protrusions with which the fixed surface of the permanent magnet abuts are formed on the inner peripheral surface of the rotating body so as to protrude inward in the radial direction of the rotating body,
The rotor formed by the recessed part formed between the said protrusion parts becomes the adhesive agent pool which the adhesive agent for fixing the said permanent magnet to the said internal peripheral surface of the said rotary body accumulates.   A motor comprising the rotor according to any one of claims 1 to 12 and a stator.

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