JP2015100202A - Rotor, motor and method for manufacturing rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor in which a plurality of permanent magnets can be more surely fixed on a rotary shaft by a tape wound around the plurality of permanent magnets and vibration of a portion floating between the permanent magnets in the tape can be suppressed, and to provide a motor including the rotor and a method for manufacturing the rotor.SOLUTION: In a rotor 40, a plurality of permanent magnets 42 are fixed on an outer peripheral surface 45f of a rotor core 45 of a rotary shaft 49 so that outer peripheral surfaces 422 of the permanent magnets 42 are convex curved surfaces. A tape 47 is wound around the radial outside of the permanent magnets 42 and the tape 47 is fixed on the outer peripheral surfaces 422 of the plurality of permanent magnets 42 by adhesive. Between two adjacent permanent magnets 42, a part of the tape 47 enters the inside inner than a virtual straight line P circumscribed on the outer peripheral surfaces 422 of the two permanent magnets 42. Therefore, a portion floating from the permanent magnets 42 in the tape 47 is short between the two permanent magnets 42.

Description

  The present invention relates to a rotor, a motor, and a rotor manufacturing method in which a plurality of permanent magnets are fixed to the outer peripheral surface of a rotating shaft.

  In a rotor used for a motor, a generator, or the like, a plurality of permanent magnets are fixed to the outer peripheral surface of a rotating shaft. In addition, for the purpose of preventing the permanent magnets from being scattered, a technique has been proposed in which a tape is wound in an annular shape so as to surround the permanent magnet around the rotor, and the tape is bonded and fixed to the outer peripheral surface of the permanent magnet. (See Patent Document 1).

JP 2013-9458 A

  In order to wind the tape so that the outer peripheral surface of the permanent magnet and the tape are in close contact with each other as in the configuration of Patent Document 1, the tape is wound with tension applied to the tape. For this reason, between two adjacent permanent magnets, the tape extends along an imaginary straight line circumscribing the outer peripheral surface of the two permanent magnets. The part floating from the permanent magnet is long. Accordingly, there is a problem in that a portion of the tape floating from the permanent magnet vibrates, causing abnormal noise and contact between the tape and the stator.

  In view of the above problems, an object of the present invention is to provide a rotor, a motor, and a rotor that can suppress vibration of a portion floating between permanent magnets in a tape wound around a plurality of permanent magnets. It is to provide a manufacturing method.

  In order to solve the above problems, a rotor according to the present invention includes a rotating shaft, a plurality of permanent magnets arranged in a circumferential direction of the rotating shaft, and fixed to an outer peripheral surface of the rotating shaft, and the plurality of permanent magnets. And a tape fixed to the outer peripheral surface of the plurality of permanent magnets by an adhesive, and between the two permanent magnets among the plurality of permanent magnets, When viewed from the axial direction of the rotating shaft, a part of the tape enters inside a virtual straight line circumscribing the outer peripheral surfaces of the two permanent magnets.

  In the present invention, a tape is wound around the radially outer side of the plurality of permanent magnets, and the tape is fixed to the outer peripheral surface of the plurality of permanent magnets with an adhesive. For this reason, even when the permanent magnet is broken or the permanent magnet is peeled off from the rotating shaft, scattering of the permanent magnet can be suppressed. In addition, between two adjacent permanent magnets, a part of the tape enters inside a virtual straight line circumscribing the outer peripheral surface of the two permanent magnets. The part floating from the magnet is short. Therefore, when the rotor rotates, the portion of the tape that is floating from the permanent magnet is unlikely to vibrate, so that it is possible to suppress the occurrence of abnormal noise or contact between the tape and the stator.

  In the present invention, the tape is wound in a multiple manner along the outer peripheral surfaces of the plurality of permanent magnets, and when viewed from the axial direction of the rotating shaft, the tape has at least the first one from the inside as the virtual. It is preferable to enter inside the straight line. According to such a configuration, the scattering of the permanent magnet can be more reliably suppressed with the tape.

  In the present invention, it is preferable that at least the first and second layers from the inner side enter the inner side of the virtual straight line when viewed from the axial direction of the rotating shaft. According to such a configuration, the scattering of the permanent magnet can be more reliably suppressed with the tape.

  In the present invention, between the two permanent magnets, at least a part of a gap formed in a portion where the base material of the tape is floating from the outer peripheral surface of the permanent magnet is filled with an adhesive layer. preferable. According to such a configuration, since the tape and the permanent magnet are bonded even at a portion where the tape is slightly lifted from the permanent magnet, scattering of the permanent magnet can be more reliably suppressed with the tape.

  In this case, in the gap, the interface of the adhesive layer is preferably a concave curved surface that is recessed toward the back of the gap when viewed from the axial direction of the rotating shaft. According to such a configuration, since the contact area between the base material of the tape and the adhesive layer and the contact area between the permanent magnet and the adhesive layer are large, even if the tape is slightly lifted from the permanent magnet, The magnet is securely bonded. Therefore, scattering of the permanent magnet can be more reliably suppressed with the tape.

  In the present invention, the tape is a tape with an adhesive in which an adhesive is applied to the base material, and the adhesive layer preferably includes a portion of the adhesive that oozes from the base material. . According to this structure, the process of apply | coating an adhesive agent after winding a tape is unnecessary.

  In the present invention, the substrate is preferably made of a glass cloth woven with glass fibers. According to this configuration, the permanent magnet can be fixed with a thin tape. Moreover, if it is a glass cloth, deterioration with time is small.

  In this invention, when it sees from the axial direction of the said rotating shaft, it is preferable that the outer peripheral surface of the said permanent magnet is a convex curve. According to such a configuration, the occurrence of cogging can be suppressed. Further, particularly when the outer peripheral surface of the permanent magnet is a convex curved surface, the portion where the tape is floating from the permanent magnet tends to be long between the two permanent magnets. Even when the outer peripheral surface is a convex curved surface, it is possible to shorten the float of the tape.

  A motor including a rotor to which the present invention is applied has a cylindrical stator facing the outer peripheral surface of the rotor.

  The method for manufacturing a rotor according to the present invention includes a permanent magnet fixing step of fixing a plurality of permanent magnets on the outer peripheral surface of a rotating shaft so as to be arranged in the circumferential direction, and winding a tape around a radially outer side of the plurality of permanent magnets. A tape winding step for bonding and fixing the tape to the outer peripheral surfaces of the plurality of permanent magnets, and in the tape winding step, after winding the tape on the radially outer side of the plurality of permanent magnets, Among the plurality of permanent magnets, the tape is pressed radially inward between two adjacent permanent magnets.

  In the present invention, the tape is wound around the radial direction of the plurality of permanent magnets, and the tape is adhered and fixed to the outer peripheral surfaces of the plurality of permanent magnets, so that the permanent magnets are not damaged or peeled off from the rotating shaft. Even if it occurs, the scattering of the permanent magnet can be suppressed. In addition, after winding the tape, in order to press the tape radially inward between the two adjacent permanent magnets, a part of the tape between the two adjacent permanent magnets It goes inside the virtual straight line that circumscribes the outer peripheral surface. For this reason, between the two permanent magnets, the portion of the tape floating from the permanent magnet is short. Accordingly, when the rotor rotates, the portion of the tape that is floating from the permanent magnet is unlikely to vibrate, so that occurrence of abnormal noise, contact between the tape and the stator, and the like can be suppressed.

  In this invention, it is preferable to wind the said tape in multiple along the outer peripheral surface of these permanent magnets.

  In this invention, it is preferable that the said tape is a tape with an adhesive agent with which the adhesive agent was provided to the base material.

  In the present invention, a tape is wound around the radially outer side of the plurality of permanent magnets, and the tape is fixed to the outer peripheral surface of the plurality of permanent magnets with an adhesive. For this reason, even when the permanent magnet is broken or the permanent magnet is peeled off from the rotating shaft, scattering of the permanent magnet can be suppressed. In addition, between two adjacent permanent magnets, a part of the tape enters inside a virtual straight line circumscribing the outer peripheral surface of the two permanent magnets. The part floating from the magnet is short. Therefore, when the rotor rotates, the portion of the tape that is floating from the permanent magnet is unlikely to vibrate, so that it is possible to suppress the occurrence of abnormal noise or contact between the tape and the stator.

It is explanatory drawing of the motor to which this invention is applied. It is explanatory drawing of the stator etc. of the motor to which this invention is applied. It is explanatory drawing of the rotor of the motor to which this invention is applied. It is a top view of the rotor of the motor to which this invention is applied. It is explanatory drawing which expands and shows a part of rotor of the motor to which this invention is applied. It is explanatory drawing which shows the manufacturing method of the rotor to which this invention is applied. It is explanatory drawing of the rotor which concerns on another embodiment of this invention.

  Hereinafter, a rotor and a motor to which the present invention is applied will be described with reference to the drawings. In the following description, in the direction in which the axis of the rotating shaft (motor axis L) extends, one side on which the rotating shaft protrudes is referred to as an output side L1, and the opposite side to the side on which the rotating shaft protrudes ( The other side will be described as the non-output side L2.

(General configuration of motor)
FIG. 1 is an explanatory view of a motor 1 to which the present invention is applied. FIGS. 1A and 1B are a perspective view of the motor 1 as viewed from the output side L1 and a longitudinal sectional view of the motor 1. FIG.

  A motor 1 shown in FIG. 1 is a permanent magnet type synchronous motor, and includes a rectangular cylindrical core holder 10, a cylindrical stator 30 arranged inside the core holder 10, and a rotor 40 arranged inside the stator 30. And an encoder 60 that detects the rotational speed and angular position of the rotor 40 on the opposite side L2 to the stator 30. A connector holder 101 is fixed to the side surface of the core holder 10, and a connector 102 for supplying power to the stator 30 is fixed to the connector holder 101.

  A plate-like flange 11 is fixed to the output side L 1 of the core holder 10, and a bearing 13 on the output side L 1 made of a ball bearing is fixed by a ring portion 14 of the flange 11. A bearing holder 15 is fixed to the non-output side L <b> 2 of the core holder 10, and an encoder cover 16 that covers the encoder 60 is fixed to the bearing holder 15. A connector 161 for outputting the detection result of the encoder 60 is fixed to the side surface of the encoder cover 16. The bearing holder 15 is fixed with a bearing 17 on the non-output side L2 made of a ball bearing, and the rotor 40 is rotatably supported by the bearings 13 and 17.

  The encoder 60 includes a sensor magnet 62 attached via a magnet holder 61 to a shaft end portion on the counter-output side L2 of the rotary shaft 49, and a sensor substrate 64 disposed on the motor axis L so as to face the sensor magnet 62. The sensor substrate 64 is formed with a magnetosensitive element (not shown). The sensor substrate 64 is fixed to a substrate holder 65 attached to the end surface of the bearing holder 15 on the opposite output side L2.

(Configuration of stator 30)
FIG. 2 is an explanatory diagram of the stator 30 and the like of the motor 1 to which the present invention is applied. FIGS. 2A and 2B are a perspective view of a state in which the rotor 40 is disposed inside the stator 30, and the rotor 40. FIG. 3 is a perspective view of a state in which is removed from the inside of the stator 30. In FIG. 2, the drive coil is not shown.

  As shown in FIG. 2, the stator 30 is wound around each of the salient poles 31 via insulating members 38 and 39 and a plurality of salient poles 31 projecting radially inwardly at equal angular intervals. And a drive coil 33 (see FIG. 1B) for each phase. The stator core 32 is a divided core divided into a plurality in the circumferential direction, and is formed by arranging a plurality of core pieces 320 arranged in the circumferential direction in the circumferential direction. Here, each of the plurality of core pieces 320 includes a salient pole 31, and insulating members 38 and 39 are attached to each of the plurality of core pieces 320.

(Configuration of rotor 40)
FIG. 3 is an explanatory diagram of the rotor 40 of the motor 1 to which the present invention is applied. FIGS. 3A and 3B are a perspective view of the rotor 40 and an exploded perspective view of the rotor 40. FIG. 4 is a plan view of the rotor 40 of the motor 1 to which the present invention is applied. FIGS. 4A and 4B are a plan view before the tape is attached to the rotor 40, and the tape is attached to the rotor 40. FIG. In FIG. 3, the illustration of the tape is omitted. In FIG. 3B, only one of the plurality of permanent magnets 42 is shown.

  As shown in FIGS. 1, 2, 3, and 4, the rotor 40 includes a rotating shaft 49 that extends along the motor axis L and a permanent magnet 42 that is fixed to the outer peripheral surface of the rotating shaft 49. I have. The rotor 40 is arranged in a state where the permanent magnet 42 has a slight gap between the permanent magnet 42 and the salient pole 31 of the stator core 32. Further, the end portion on the output side L1 of the rotating shaft 49 further protrudes from the flange 11 to the output side L1. Further, the rotor 40 is rotatable inside the stator 30 by the rotation shaft 49 being supported by the bearings 13 and 17.

  As shown in FIGS. 2, 3, and 4, the rotation shaft 49 includes a shaft body 41 that extends along the motor axis L and a rotor core 45 that is fixed around the shaft body 41. The shaft body 41 has its outer diameter dimension switched at a plurality of locations in the motor axis L direction, and the large diameter portion 41 a is fitted in the center hole 455 of the rotor core 45. The shaft body 41 has a flange portion 41b having a diameter larger than that of the large-diameter portion 41a at a position adjacent to the large-diameter portion 41a on the output side L1, and the rotor core 45 abuts on the flange portion 41b to contact the output-side L1. The position of is defined.

  The inner circumferential surface 45a of the rotor core 45 is formed with a key groove 450 that is recessed radially outward at one place in the circumferential direction. In addition, a concave portion 410 extending in the motor axis L direction is formed at one circumferential position on the outer peripheral surface of the large-diameter portion 41 a of the shaft body 41. A plate-like key 44 extending in the motor axis L direction is fitted into the recess 410, and a portion of the key 44 that protrudes radially outward from the outer peripheral surface of the large-diameter portion 41 a of the shaft body 41 is the rotor core 45. The key groove 450 is fitted. In this way, the rotor core 45 is restricted from rotating relative to the shaft body 41. In this embodiment, the key groove 450 extends on the entire inner circumferential surface 45a of the rotor core 45 in the motor axis L direction and reaches the end surface 45c on the output side L1 and the end surface 45d on the counter-output side L2 of the rotor core 45. Yes.

  A plurality of the permanent magnets 42 are arranged in the circumferential direction with respect to the outer peripheral surface of the rotating shaft 49 (the outer peripheral surface 45f of the rotor core 45), and are bonded and fixed to the outer peripheral surface of the rotating shaft 49 (the outer peripheral surface 45f of the rotor core 45). Yes. The permanent magnet 42 is made of a magnet piece having the same dimension in the motor axis L direction as that of the rotor core 45 in the motor axis L direction.

  In the permanent magnet 42, an inner surface 421 bonded and fixed to the outer peripheral surface 45f of the rotor core 45 is a flat surface, and an outer peripheral surface 422 positioned radially outward is a convex curved surface. In this embodiment, the outer peripheral surface 422 of the permanent magnet 42 has a symmetrical shape in the circumferential direction around the top 422a of the convex curved surface. On the outer peripheral surface 45f of the rotor core 45, flat portions 451 to which the inner surface 421 of the permanent magnet 42 is bonded and fixed are formed at a plurality of locations in the circumferential direction, and project between the adjacent flat portions 451 radially outward. A protrusion 452 is formed between the adjacent permanent magnets 42. For this reason, both ends in the circumferential direction of the permanent magnet 42 are positioned in contact with the protrusion 452.

(Configuration of tape 47)
FIG. 5 is an enlarged explanatory view showing a part of the rotor 40 of the motor 1 to which the present invention is applied. FIGS. 5 (a) and 5 (b) show a tape 47 wound around the permanent magnet 42. It is a top view which expands and shows a mode that it adhered and fixed, and a top view which expands further between two adjacent permanent magnets.

  As shown in FIG. 2B, FIG. 4B and FIG. 5, in the rotor 40 of this embodiment, a tape 47 is wound on the radially outer side of the plurality of permanent magnets 42. The outer peripheral surfaces 422 of the plurality of permanent magnets 42 are fixed with an adhesive. The tape 47 is a member for preventing the permanent magnet 42 from being scattered even when the permanent magnet 42 is broken or peeled off from the rotating shaft 49 due to the centrifugal force when the rotor 40 rotates. is there.

  In this embodiment, the tape 47 has the same dimension (width dimension) in the motor axis L direction as that of the rotor core 45 and the permanent magnet 42 in the motor axis L direction. In this embodiment, the tape 47 is an adhesive-attached tape in which an adhesive is applied to the base material 470. After the tape 47 is wound around the plurality of permanent magnets 42, the adhesive is cured, whereby the tape 47 Are an adhesive layer (not shown) existing at a position where the base material 470 and the permanent magnet 42 overlap, and an adhesive layer 475 (see FIG. 5) interposed between the base material 470 and the permanent magnet 42. Thus, the outer peripheral surface 422 of the permanent magnet 42 is bonded and fixed.

  More specifically, the tape 47 is a tape in which a base material 470 made of glass cloth woven with glass fibers is impregnated with a prepreg of a thermosetting epoxy adhesive, and the tape 47 is wound around the plurality of permanent magnets 42. After winding 47, the prepreg is thermally cured, whereby the tape 47 is bonded to an adhesive layer (not shown) where the base material 470 and the permanent magnet 42 overlap each other, and the base material 470 and the permanent material are made permanent. It is bonded and fixed to the outer peripheral surface 422 of the permanent magnet 42 by an adhesive layer 475 interposed between the magnet 42.

  Here, when the tape 47 is seen from the axial direction of the rotating shaft 49 (motor axis L direction) between the two adjacent permanent magnets 42 among the plurality of permanent magnets 42, 2. Two permanent magnets 42 enter radially inward from a virtual straight line P (see FIG. 5) circumscribing the outer peripheral surface 422 of the permanent magnet 42.

  For this reason, as shown in FIG. 5B, the tape 47 has a gap between the outer peripheral surface 422 of the permanent magnet 42 and the outer peripheral surface 422 (convex curved surface) of the permanent magnet 42 at the top portion 422a located on the outermost radial direction. A portion of the tape 47 is adhered to the outer peripheral surface 422 of the permanent magnet 42 without any gap even inside the virtual straight line P circumscribing the outer peripheral surface 422 of the two permanent magnets 42. . When viewed from the axial direction of the rotating shaft 49 (motor axis L direction) due to the fact that a part of the tape 47 floats from the outer peripheral surface 422 of the permanent magnet 42 inside the virtual straight line P in the radial direction. In addition, a gap 48 is generated between the base material 470 of the tape 47 and the outer peripheral surface 422 of the permanent magnet 42, and the adhesive that has oozed out of the base material 470 is also cured in at least a part of the gap 48. Embedded with an adhesive layer 475. For this reason, the base material 470 of the tape 47 and the outer peripheral surface 422 of the permanent magnet 42 are fixed by the adhesive layer 475 even in the portion where the gap 48 is formed.

  In addition, since the adhesive has an affinity for both the base material 470 and the permanent magnet 42 before being cured, the interface 475a of the adhesive layer 475 located in the gap 48 is It is a concave curved surface that is recessed toward the back (the top 422a side of the outer peripheral surface 422 of the permanent magnet 42). That is, since the adhesive has sufficient wettability with respect to the base material 470 made of glass cloth and the permanent magnet 42 in a state before being cured, as a result of capillary action in the gap 48, the gap 48 The interface 475a of the adhesive layer 475 that is positioned becomes a concave curved surface that is recessed toward the back of the gap 48 (on the top 422a side of the outer peripheral surface 422 of the permanent magnet 42), and is cured in this state.

(Manufacturing method of the rotor 40)
FIG. 6 is an explanatory view showing a method for manufacturing the rotor 40 to which the present invention is applied. To manufacture the rotor 40 described with reference to FIG. 5 and the like, first, as shown in FIG. 6, in the permanent magnet fixing step, a plurality of planes of the outer peripheral surface of the rotating shaft 49 (the outer peripheral surface 45f of the rotor core 45). A permanent magnet 42 is bonded and fixed to each of the portions 451.

  Next, in the tape winding process, the tape 47 is wound around the radial outer sides of the plurality of permanent magnets 42 and then heated to bond and fix the tape 47 to the outer peripheral surfaces of the plurality of permanent magnets 42. In such a tape winding process, after winding the tape 47 without applying a large tension to the tape 47, as indicated by an arrow R, among a plurality of permanent magnets 42 by a jig (not shown) or the like, The tape 47 is pressed radially inward between two adjacent permanent magnets 42, and then the tape 47 is heated to cure the adhesive. As a result, as described with reference to FIG. 5, between the two adjacent permanent magnets 42 among the plurality of permanent magnets 42, a part of the tape 47 is formed on the outer peripheral surface 422 of the two permanent magnets 42. It has a structure that goes inward in the radial direction from the circumscribed virtual straight line P (see FIG. 5). In this embodiment, the tape 47 is a tape in which a base material 470 made of glass cloth woven with glass fibers is impregnated with a prepreg of a thermosetting epoxy adhesive. 47 is covered with release paper. Such release paper is removed after the adhesive is cured.

(Main effects of this form)
As described above, in this embodiment, the tape 47 is wound around the radial direction outside of the plurality of permanent magnets 42, and the tape 47 is fixed to the outer peripheral surfaces 422 of the plurality of permanent magnets 42 with an adhesive. For this reason, even when the permanent magnet 42 is damaged or the permanent magnet 42 is peeled off from the rotating shaft 49, the scattering of the permanent magnet 42 can be suppressed. Further, between the two adjacent permanent magnets 42, a part of the tape 47 enters inside the virtual straight line P circumscribing the outer peripheral surface 422 of the two permanent magnets 42. The portion of the tape 47 that is floating from the permanent magnet 42 is short.

  In particular, since the outer peripheral surface 422 of the permanent magnet 42 is a convex curved surface for the purpose of suppressing the occurrence of cogging, the portion where the tape 47 floats from the permanent magnet 42 between the two permanent magnets 42 is long. However, according to the present embodiment, even when the outer peripheral surface 422 of the permanent magnet 42 is a convex curved surface, the floating of the tape 47 from the outer peripheral surface 422 of the permanent magnet 42 can be shortened.

  Therefore, the permanent magnet 42 can be more reliably fixed by the tape 47. Therefore, even when the end portion of the permanent magnet 42 is damaged, scattering of the permanent magnet 42 can be suppressed by the tape 47. Further, since the portion of the tape 47 floating from the permanent magnet 42 is short, when the rotor 40 rotates, the portion of the tape 47 floating from the permanent magnet 42 hardly vibrates. Therefore, the occurrence of abnormal noise, contact between the tape 47 and the stator 30 can be suppressed.

  Further, even when the gap 48 is generated in the portion where the base material 470 of the tape 47 is floating from the outer peripheral surface 422 of the permanent magnet 42, at least a part of the gap 48 is filled with the adhesive layer 475. For this reason, even when the base material 470 of the tape 47 is floating from the outer peripheral surface 422 of the permanent magnet 42, the tape 47 and the permanent magnet 42 are adhered to each other. Can be suppressed. Further, in the gap 48, the interface 475a of the adhesive layer 475 is a concave curved surface that is recessed toward the back of the gap 48, so that the contact area between the base material 470 of the tape 47 and the adhesive layer 475 is permanent. The contact area between the magnet 42 and the adhesive layer 475 is wide. For this reason, even if the tape 47 is slightly lifted from the permanent magnet 42, the tape 47 and the permanent magnet 42 are securely bonded. Therefore, scattering of the permanent magnet 42 can be more reliably suppressed with the tape.

  The tape 47 is a tape with an adhesive in which an adhesive is applied to the base material 470, and the adhesive layer 475 is a portion of the adhesive that oozes out from the base material 470. For this reason, after winding the tape 47, the process of apply | coating an adhesive agent is unnecessary.

  Further, since the base material 470 is made of glass cloth woven with glass fibers, the permanent magnet 42 can be fixed with the thin tape 47. Moreover, if it is a glass cloth, deterioration with time is small.

(Other embodiments)
FIG. 7 is an explanatory diagram of a rotor 40 according to another embodiment of the present invention. In the above-described embodiment, the case where the tape 47 is wound in a single layer is illustrated. However, as shown in FIG. 7, the tape 47 is preferably wound in multiple layers, for example, in a double layer. According to such a configuration, the permanent magnet 42 can be more reliably fixed by the tape 47. In this case, at least, in the first heavy tape 47a from the inner side in the radial direction, a part of the tape 47a only needs to enter inside the virtual straight line P circumscribing the outer peripheral surface 422 of the two permanent magnets 42.

In addition, as shown in FIG. 7, in the first tape 47 a and the second tape 47 b from the inside in the radial direction, a part of the tape 47 is assumed to circumscribe the outer peripheral surface 422 of the two permanent magnets 42. It is preferable to enter inside the straight line P. In such a configuration, after the tape 47 is wound twice, the tape 47 is pressed radially inward between two adjacent permanent magnets 42, and then the tape 47 is heated to cure the adhesive.
(Other embodiments)
In the above-described embodiment, a tape with an adhesive is used as the tape 47. However, after the tape 47 is wound, an adhesive is applied to the inside of the tape 47, or an adhesive is applied to the outer peripheral surface 422 of the permanent magnet 42. After coating, a method of winding the tape 47 may be employed.

  In the above embodiment, the tape 47 having a width equal to the dimension of the permanent magnet 42 in the motor axis L direction is used as the tape 47, but the tape 47 having a width narrower than the dimension of the permanent magnet 42 in the motor axis L direction is spiral. The present invention may be applied to a rotor 40 of a type wound around.

  In the above embodiment, the present invention is applied to a permanent magnet type synchronous motor. However, the present invention may be applied to, for example, a stepping motor, other motors, or a generator rotor.

DESCRIPTION OF SYMBOLS 1 ... Motor 30 ... Stator 33 ... Drive coil 40 ... Rotor 41 ... Shaft body 42 ... Permanent magnet 45 ... Rotor core 45f ... Outer peripheral surface of rotor core (outer peripheral surface of rotating shaft)
47 ·· Tape 48 · · Clearance 49 · · · Rotating shaft 422 · · Peripheral magnet outer surface 470 · · Tape base material 475 · · Adhesive layer 475a · · Adhesive layer interface P · · Two permanent magnets Virtual straight line circumscribing the outer peripheral surface

Claims (12)

A rotation axis;
A plurality of permanent magnets arranged in the circumferential direction of the rotating shaft and fixed to the outer peripheral surface of the rotating shaft;
A tape wound around the radial direction of the plurality of permanent magnets, and fixed to the outer peripheral surface of the plurality of permanent magnets by an adhesive;
Have
Among the plurality of permanent magnets, between two adjacent permanent magnets, when viewed from the axial direction of the rotating shaft, a part of the tape is from an imaginary straight line circumscribing the outer peripheral surface of the two permanent magnets. A rotor characterized by entering inside. The tape is wound in multiple along the outer peripheral surface of the plurality of permanent magnets,
2. The rotor according to claim 1, wherein when viewed from the axial direction of the rotating shaft, the first tape from the inside enters the tape inside the virtual line.   3. The rotor according to claim 2, wherein when viewed from the axial direction of the rotation shaft, at least the first and second tapes enter from the inside of the virtual straight line.   At least a part of a gap formed between the two permanent magnets where the base material of the tape floats from the outer peripheral surface of the permanent magnet is filled with an adhesive layer. Item 4. The rotor according to any one of Items 1 to 3.   The rotor according to claim 4, wherein the interface of the adhesive layer in the gap is a concave curved surface that is recessed toward the back of the gap when viewed from the axial direction of the rotation shaft. The tape is a tape with an adhesive in which an adhesive is applied to the base material,
6. The rotor according to claim 4, wherein the adhesive layer includes a portion of the adhesive that has oozed out of the base material.   The rotor according to claim 6, wherein the base material is made of a glass cloth woven with glass fibers.   The rotor according to any one of claims 1 to 7, wherein an outer peripheral surface of the permanent magnet is a convex curved surface when viewed from the axial direction of the rotating shaft. A motor comprising the rotor according to any one of claims 1 to 8,
A motor having a cylindrical stator facing the outer peripheral surface of the rotor. A permanent magnet fixing step of fixing a plurality of permanent magnets to be arranged in the circumferential direction on the outer peripheral surface of the rotating shaft;
A tape winding step of winding a tape around a radial outer side of the plurality of permanent magnets and bonding and fixing the tape to an outer peripheral surface of the plurality of permanent magnets;
Have
In the tape winding step, after the tape is wound on the radially outer side of the plurality of permanent magnets, the tape is placed on the radially inner side between two adjacent permanent magnets among the plurality of permanent magnets. A method for manufacturing a rotor, comprising pressing.   The method of manufacturing a rotor according to claim 10, wherein the tape is wound in a multiple manner along an outer peripheral surface of the plurality of permanent magnets.   The method for manufacturing a rotor according to claim 10, wherein the tape is a tape with an adhesive in which an adhesive is applied to a base material.