JP2005295732A - Rotor and manufacturing method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly locate a magnet at a prescribed position of a rotor. <P>SOLUTION: In a magnet mounting hole of which one of opening portion of each magnet mounting hole of a yoke 12 is blocked by one of end face plate 15, an unmagnetized magnet 14 and a resin holding bag 22 in which a resin 22a is not charged are inserted. The predetermined amount of resin 22a is charged into the resin holding bag 22. The resin holding bag 22 is changed in shape so as to fill in the gap 21 between the magnet 14 and the magnet mounting hole. The magnet 14 is pressed against toward the radial outer peripheral side. An outer peripheral face 14A of the magnet 14 is positioned in contact with an inner surface 13A of an outer peripheral side of the magnet mounting hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotor for a permanent magnet motor and a method for manufacturing the rotor.

Conventionally, for example, when a permanent magnet is mounted and fixed in a magnet mounting hole provided on the outer peripheral portion of the rotor, for example, a rare earth magnet or the like is made of a sintered body, and a brittle permanent magnet is press-fitted. Since it is difficult to mount, there is a method of providing a predetermined clearance so that the size of the magnet mounting hole is larger than the size of the permanent magnet, and filling the adhesive or the like so as to fill the gap for this clearance. Are known.
By the way, the permanent magnet mounted in the magnet mounting hole in the stationary state of the rotor is positioned at a position shifted to the inner peripheral side where the amount of the magnetic material is relatively large with respect to the radial direction of the rotor. However, when the rotor rotates, centrifugal force acts on the permanent magnet, and the permanent magnet tends to be displaced toward the outer peripheral side of the rotor. As a result, when the adhesive is filled in a relatively large gap provided between the outer peripheral surface of the permanent magnet and the outer peripheral surface of the magnet mounting hole when the rotor is stationary, the adhesive is solidified. An excessive pressure accompanying the centrifugal force of the permanent magnet acts on the adhesive layer formed in this manner, and there is a possibility that problems such as crushing of the adhesive layer may occur. For example, if the adhesive layer breaks, the permanent magnet is displaced in the magnet mounting hole with the rotation of the rotor, and vibration and noise increase, and an impact load acts on the rotor body to reduce the fatigue strength. Problems arise.
To solve this problem, for example, rotate the rotor at a timing before the adhesive filled in the magnet mounting hole is cured, and act on the permanent magnet in the magnet mounting hole with the centrifugal force accompanying the rotation. A method of positioning at a predetermined position (for example, see Patent Document 1) is known.
JP 2000-316243 A

However, in the magnet positioning method according to the above prior art, the adhesive leaks out from the magnet mounting hole due to the centrifugal force or the like accompanying rotation acting on the adhesive before curing, or a plurality of laminated steel plates In such a rotor, the adhesive filled in the magnet mounting hole penetrates between the laminated steel plates, and it becomes difficult to fix the permanent magnet in the magnet mounting hole by the adhesive.
In particular, when the adhesive penetrates between laminated steel plates in a rotor made of laminated steel plates, it becomes difficult to properly grasp the filling amount required when filling the adhesive into the magnet mounting holes. In addition to the possibility that a gap will be generated between the magnet mounting hole and the permanent magnet as a change with time from the initial state immediately after completion, for example, when the rotor is disassembled and reused, There is a risk that it will be difficult to resolve and disassemble the state.
The present invention has been made in view of the above circumstances, and while properly grasping the required amount of resin used when fixing the magnet to the rotor, the magnet is easily positioned at a predetermined position of the rotor, and the rotor An object of the present invention is to provide a rotor and a method of manufacturing the rotor that can save labor required for disassembling the rotor.

  In order to solve the above problems and achieve the object, a rotor according to a first aspect of the present invention is a magnet mounting portion (for example, a yoke 12 in an embodiment to be described later) provided in a rotor main body ( For example, a rotor in which a magnet (for example, a magnet 14 in an embodiment described later) is mounted on a magnet mounting portion 13) in an embodiment described later, the inner surface of the magnet mounting portion and the magnet Between the surface, a resin holding back (for example, a resin holding back 22 in an embodiment described later) filled with a resin (for example, a resin 22a in an embodiment described later) is provided, and the resin The back is characterized by pressing the magnet toward the inner surface of the magnet mounting portion.

According to the rotor described above, for example, the resin holding back is disposed between the inner peripheral surface of the magnet and the inner peripheral side inner surface of the magnet mounting portion, so that the magnet is positioned at a predetermined position shifted to the outer peripheral side in the magnet mounting portion. It can be easily positioned and fixed, and it can secure the desired mechanical strength for the magnet that is going to be displaced to the outer circumference during the rotation of the rotor, generating vibration and noise and reducing fatigue strength. Can be suppressed.
Moreover, since the resin that fixes the magnet in the magnet mounting portion is held in the resin holding bag, when filling the resin in the resin holding bag, the gap between the magnet and the magnet mounting portion is filled. It is only necessary to fill the resin holding bag with an appropriate amount of resin as required. For example, when the rotor body is formed by a laminated steel plate in which a plurality of electromagnetic steel plates are laminated, It is possible to prevent problems such as permeation between laminated steel plates, or the occurrence of, for example, uncured resin flowing out of the magnet mounting portion.
Further, for example, when disassembling the rotor and reusing each member constituting the rotor, for fixing the magnet only by a simple process of simply removing the resin holding back from the magnet mounting portion. The resin can be separated from the rotor body, and each member constituting the rotor can be easily reused.

  According to a second aspect of the present invention, there is provided a rotor manufacturing method in which a magnet is mounted on a magnet mounting portion provided in a rotor body, wherein the magnet is placed in the magnet mounting portion. Magnet insertion process (for example, step S02 and step S11 in the embodiment described later) and a resin holding back (for example, described later) that can be filled with resin (for example, resin 22a in the embodiment described later). The resin holding back 22) in the embodiment to be inserted is inserted into the magnet mounting portion (for example, step S02 and step S12 in the embodiment described later), and the resin is filled in the resin holding back. Then, the magnet is positioned at a position shifted to the outer peripheral side in the magnet mounting portion by the pressing force that the resin holding back is deformed and presses the magnet, and before the positioning. Magnet position fixing process of fixing the magnet to the magnet mounting portion (for example, step S03 and step S04 in the embodiment described below, steps S12 and S04) is characterized in that it comprises a.

According to the rotor manufacturing method described above, in the magnet insertion step, for example, an unmagnetized magnet is inserted into the magnet mounting portion, and this magnet is pressed radially outward by the resin holding back that holds the resin inside. Then, it is positioned at a predetermined position shifted to the outer peripheral side in the magnet mounting part, for example, a position where the outer peripheral surface of the magnet contacts the outer peripheral side inner surface of the magnet mounting part. Then, when the resin filled in the resin holding bag is cured, the positioned magnet is fixed in the magnet mounting portion.
As a result, the magnet can be easily positioned and fixed in advance at a predetermined position shifted to the outer peripheral side in the magnet mounting portion, and a desired magnet can be displaced with respect to the magnet to be displaced to the outer peripheral side when the rotor rotates. Mechanical strength can be ensured, generation of vibration and noise, and reduction of fatigue strength can be suppressed.
Moreover, since the resin is held in the resin holding bag, it is only necessary to fill the resin holding bag with an appropriate amount of resin necessary for filling the gap between the magnet and the magnet mounting portion. For example, when the rotor body is formed of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated, the resin before hardening penetrates between the laminated steel plates, or the resin before hardening flows out of the magnet mounting part. It is possible to prevent the occurrence of problems such as
Further, for example, when disassembling the rotor and reusing each member constituting the rotor, for fixing the magnet only by a simple process of simply removing the resin holding back from the magnet mounting portion. The resin can be separated from the rotor body, and each member constituting the rotor can be easily reused.

  Furthermore, in the rotor manufacturing method according to claim 3, in the magnet insertion step and the back insertion step, the resin holding back bonded to the magnet is inserted into the magnet mounting portion together with the magnet. It is characterized by.

  According to the above method for manufacturing a rotor, the resin holding bag can be easily inserted into the magnet mounting portion.

  Furthermore, in the rotor manufacturing method according to the fourth aspect of the present invention, the back insertion step inserts the resin holding bag held by the guide member into the magnet mounting portion together with the guide member. .

  According to the above method for manufacturing a rotor, the resin holding bag can be easily inserted into the magnet mounting portion.

  Furthermore, in the method for manufacturing a rotor according to claim 5, the resin holding back is a space between the surface of the magnet positioned in the magnet position fixing step and the inner surface of the magnet mounting portion. It can be transformed into a shape equivalent to

  According to the method for manufacturing a rotor described above, the resin holding back is, for example, equivalent to a space portion formed between the surface of the magnet previously positioned in the magnet position fixing step and the inner surface of the magnet mounting portion. When it is inserted into the magnet mounting part, it can be deformed into a shape suitable for this back insertion process, or it can be elastically deformed reversibly or irreversibly, for example, and resin is injected inside While being expanded, it is deformed so as to fill a space between the surface of the magnet and the inner surface of the magnet mounting portion. Thereby, the resin holding bag can be mounted so as to fill the space between the surface of the magnet and the inner surface of the magnet mounting portion by a simple process of simply filling the inside with resin.

According to the rotor of the first aspect of the present invention, the magnet can be easily positioned and fixed at a predetermined position shifted to the outer peripheral side in the magnet mounting portion by the resin holding back, and at the time of rotation of the rotor A desired mechanical strength can be ensured for the magnet to be displaced toward the outer peripheral side, and the occurrence of vibration and noise and the decrease in fatigue strength can be suppressed. Moreover, since the resin that fixes the magnet in the magnet mounting portion is held in the resin holding bag, when filling the resin in the resin holding bag, the gap between the magnet and the magnet mounting portion is filled. It is only necessary to fill the resin holding bag with an appropriate amount of resin as required. For example, when the rotor body is formed by a laminated steel plate in which a plurality of electromagnetic steel plates are laminated, It is possible to prevent problems such as permeation between laminated steel plates, or the occurrence of, for example, uncured resin flowing out of the magnet mounting portion.
Further, for example, when disassembling the rotor and reusing each member constituting the rotor, for fixing the magnet only by a simple process of simply removing the resin holding back from the magnet mounting portion. The resin can be separated from the rotor body, and each member constituting the rotor can be easily reused.

According to the rotor manufacturing method of the invention described in claim 2, the magnet can be easily positioned and fixed in advance at a predetermined position shifted to the outer peripheral side in the magnet mounting portion. A desired mechanical strength can be ensured for the magnet that is to be displaced toward the outer periphery during rotation, and the occurrence of vibration and noise and a decrease in fatigue strength can be suppressed. Moreover, since the resin that fixes the magnet in the magnet mounting portion is held in the resin holding bag, when filling the resin in the resin holding bag, the gap between the magnet and the magnet mounting portion is filled. It is only necessary to fill the resin holding bag with an appropriate amount of resin as required. For example, when the rotor body is formed by a laminated steel plate in which a plurality of electromagnetic steel plates are laminated, It is possible to prevent problems such as permeation between laminated steel plates, or the occurrence of, for example, uncured resin flowing out of the magnet mounting portion.
Further, for example, when disassembling the rotor and reusing each member constituting the rotor, for fixing the magnet only by a simple process of simply removing the resin holding back from the magnet mounting portion. The resin can be separated from the rotor body, and each member constituting the rotor can be easily reused.

Furthermore, according to the rotor manufacturing method of the invention described in claim 3 or claim 4, the resin holding bag can be easily inserted into the magnet mounting portion.
Furthermore, according to the rotor manufacturing method of the invention described in claim 5, the space between the surface of the magnet and the inner surface of the magnet mounting portion is filled by a simple process of filling the inside with resin. Thus, the resin holding bag can be mounted.

Hereinafter, an embodiment of a rotor and a method for manufacturing the rotor of the present invention will be described with reference to the accompanying drawings.
The rotor 10 according to the present embodiment is a rotor of a brushless DC motor that forms an electric motor for a hybrid vehicle that is used as a vehicle drive source together with an internal combustion engine, for example. The brushless DC motor rotates the rotor 10. A stator having a plurality of stator windings for generating a rotating magnetic field is provided. For example, in a parallel hybrid vehicle having a structure in which an internal combustion engine, a brushless DC motor, and a transmission are directly connected in series, the driving forces of both the internal combustion engine and the brushless DC motor are transmitted to the drive wheels of the vehicle via the transmission. It has become.

  As shown in FIG. 1, for example, the rotor 10 includes a shaft 11 that is connected to a crankshaft of an internal combustion engine and an input shaft of a transmission and transmits a motor torque, and a plurality of electromagnetic steel plates such as silicon steel plates. The substantially cylindrical yoke 12, the plurality of magnet mounting portions 13,..., 13 mounted on the yoke 12, and the end surface of the yoke 12 in the direction of the rotation axis O. 12A and 12B are provided with a pair of substantially annular plate-shaped end face plates 15 and 15 arranged so as to sandwich the both sides of both sides, and a substantially annular collar 16.

  For example, the shaft 11 formed into a substantially cylindrical shape by forging has a protruding portion that protrudes from the outer peripheral surface 11A along the circumferential direction so as to increase in diameter by one step at one end portion in the direction of the rotation axis O on the outer peripheral surface 11A. 11a, and a plurality of (for example, two) concave grooves 11b and 11b extending in the direction of the rotation axis O are formed at predetermined positions along the circumferential direction on the outer circumferential surface 11A. It is formed so as to open on 11A and on the other end surface 11B of the shaft 11 in the direction of the rotation axis O.

  The substantially cylindrical yoke 12 includes an inner peripheral surface 12C having an inner diameter slightly smaller than the outer diameter of the outer peripheral surface 11A of the shaft 11, and a rotating shaft is provided at a predetermined position along the circumferential direction on the inner peripheral surface 12C. A plurality of (for example, two) convex portions 12a, 12a extending in the O direction are formed, and the yoke 12 is relatively attached to the shaft 11 so that the inner peripheral surface 12C of the yoke 12 contacts the outer peripheral surface 11A of the shaft 11. At this time, the convex portion 12a of the yoke 12 is mounted in the concave groove 11b of the shaft 11, so that the yoke 12 and the shaft 11 are positioned at a predetermined relative position in the circumferential direction.

A plurality of magnet mounting portions 13,..., 13 are provided on the outer peripheral portion of the yoke 12 at predetermined intervals in the circumferential direction, and a rotating shaft is disposed on the outer peripheral surface 12D of the yoke 12 between the adjacent magnet mounting portions 13, 13. A concave groove 12b extending in the O direction is formed.
Each magnet mounting portion 13 formed in a salient pole shape sandwiched by the concave grooves 12b, 12b from both sides in the circumferential direction has, for example, a pair of magnet mounting holes 13a penetrating in the direction of the rotation axis O, as shown in FIG. 13a, and these two magnet mounting holes 13a, 13a are arranged adjacent to each other in the circumferential direction via the center rib 13b. Each magnet mounting hole 13a has a substantially rectangular cross section with respect to the direction of the rotation axis O. The circumferential and radial dimensions of each magnet mounting hole 13a are the width and thickness of the magnet 14 having a substantially rectangular plate shape. Is set larger than the predetermined dimension.

The magnet 14 inserted into each magnet mounting hole 13a is in contact with the outer peripheral surface 14A of the magnet 14 and the outer peripheral side inner surface 13A of the magnet mounting hole 13a, so that the both side surfaces 14B and 14C and the inner peripheral surface of the magnet 14 are in contact with each other. 14D is positioned such that a gap 21 of a predetermined dimension is formed between each circumferential inner surface 13B, 13C and inner circumferential inner surface 13D of the magnet mounting hole 13a. A resin holding back 22 filled with a resin 22a such as an epoxy resin is mounted.
The resin holding back 22 fills the gap 21 between the magnet 14 and the magnet mounting hole 13a as the internal resin 22a is hardened, and presses the magnet 14 toward the outer peripheral side in the radial direction. The surface 14A is pressed and fixed to the outer peripheral side inner surface 13A of the magnet mounting hole 13a.

  Further, the pair of magnets 14 and 14 mounted in the pair of magnet mounting holes 13a and 13a are magnetized in the thickness direction (that is, the radial direction of the rotor 12) so that the magnetization directions are the same. Is set. The pair of magnets 14, 14 and 14, 14 mounted in the pair of magnet mounting holes 13 a, 13 a and 13 a, 13 a are magnetized with respect to the magnet mounting portions 13, 13 adjacent in the circumferential direction. The direction is set to be different. That is, the magnet mounting portion 13 to which the pair of magnets 14 and 14 having the N pole on the outer peripheral side is mounted has the magnet mounting portion 13 to which the pair of magnets 14 and 14 having the S pole on the outer peripheral side are mounted. It is adjacent to the circumferential direction through the concave groove 12b.

The substantially annular plate-like end plate 15 has an outer peripheral surface 15A having an outer diameter slightly smaller than the outer diameter of the yoke 12 and an inner peripheral surface 15B having an inner diameter smaller than the inner peripheral surface of the magnet mounting hole 13a. The pair of end surface plates 15 and 15 sandwiching the end surfaces 12A and 12B of the yoke 12 from both sides abut against both end surfaces of the magnets 14 mounted in the respective magnet mounting holes 13a, and the magnets 14 are displaced in the direction of the rotation axis O. It is supposed to regulate what to do.
The inner peripheral surface 15B of the end face plate 15 is the same as or slightly larger than the outer diameter of the outer peripheral surface 11A of the shaft 11 and is a protrusion provided on the outer peripheral surface 11A of the shaft 11. A plurality of (for example, two) protrusions 15a that are formed to have an inner diameter smaller than the outer diameter of the portion 11a, and extend in the direction of the rotation axis O at predetermined positions along the circumferential direction on the inner peripheral surface 15B. , 15a are formed. That is, when the end face plate 15 is relatively attached to the shaft 11 so that the inner peripheral face 15 B of the end face plate 15 faces the outer peripheral face 11 A of the shaft 11, the protrusion 15 a of the end face plate 15 is recessed in the shaft 11. By mounting in the groove 11b, the end face plate 15 and the shaft 11 are positioned at a predetermined relative position in the circumferential direction. Further, the end face plate 15 abuts against the protruding portion 11a of the shaft 11, so that the end face plate 15 becomes the shaft. 11 is prevented from coming off from one end in the direction of the rotation axis O.

  The substantially annular collar 16 has an inner peripheral surface 16A having an inner diameter slightly smaller than the outer diameter of the outer peripheral surface 11A of the shaft 11 and an outer peripheral surface 16B having an outer diameter larger than the inner diameter of the inner peripheral surface 15B of the end plate 15. The inner peripheral surface 16A of the collar 16 is the outer peripheral surface 11A of the shaft 11 with respect to the shaft 12 on which the yoke 12 and the pair of end face plates 15 and 15 to which the plurality of magnets 14,. When the collar 16 is relatively mounted on the shaft 11 so as to abut against the shaft 11, the collar 16 abuts against the end face plate 15, and the end face plate 15 comes off from the other end of the shaft 11 in the direction of the rotation axis O. To prevent this.

  The rotor 10 according to the present embodiment has the above-described configuration. Next, a method for manufacturing the rotor 10, in particular, a method for fixing the magnet 14 to the rotor 10 will be described with reference to the accompanying drawings.

First, in step S01 shown in FIG. 3, one end face plate 15 is attached to the rotor shaft 11, and the yoke 12 is attached to the rotor shaft 11 so that the rotor shaft 11 is press-fitted into the yoke 12.
Next, in step S02, the unmagnetized magnet 14 and the resin 22a are not injected into the magnet mounting hole 13a in which one opening of each magnet mounting hole 13a of the yoke 12 is closed by one end face plate 15. The resin holding back 22 is inserted. At this time, for example, as shown in FIG. 4A, the resin holding back 22 is disposed at a position shifted to the inner peripheral side from the magnet 14.
Next, in step S <b> 03, a predetermined amount of resin 22 a is injected into the resin holding back 22. As a result, for example, as shown in FIG. 4B, the resin holding back 22 is deformed so as to fill the gap 21 between the magnet 14 and the magnet mounting hole 13a, and the magnet 14 is moved to the outer peripheral side in the radial direction. The outer circumferential surface 14A of the magnet 14 is positioned in contact with the outer circumferential inner surface 13A of the magnet mounting hole 13a.

Next, in step S04, the resin 22a is heated to a predetermined temperature to be cured, and the magnet 14 is magnet-attached hole 13a with the outer peripheral surface 14A of the magnet 14 in contact with the outer peripheral-side inner surface 13A of the magnet-attached hole 13a. Press and fix inside.
Next, in step S05, the excess of the resin holding back 22 and the cured resin 22a protruding outside from the other opening of each magnet mounting hole 13a of the yoke 12 is deleted.
In step S06, for example, as shown in FIG. 4C, the other end face plate 15 is mounted on the rotor shaft 11, and the other opening of each magnet mounting hole 13a of the yoke 12 is connected to the other end face plate 15. It is blocked by.
Next, in step S07, the collar 16 is mounted on the rotor shaft 11 so as to press-fit the rotor shaft 11 into the collar 16.
In step S08, for example, the relative position between the rotor shaft 11, the yoke 12, the pair of end face plates 15, 15 and the collar 16 is inspected and corrected.
In step S09, the rotation balance and the like are adjusted.
Next, in step S10, a predetermined magnetic flux required to ensure desired operating characteristics of the brushless DC motor is formed on the magnets 14 installed in the magnet mounting holes 13a. Thus, the magnetization direction is set to the thickness direction, magnetization is performed by an appropriate magnetizing device (not shown), and a series of processes is completed.

As described above, according to the method of manufacturing a rotor according to the present embodiment, the magnet 14 can be easily positioned and fixed in advance at a predetermined position shifted to the outer peripheral side in each magnet mounting hole 13a. The desired mechanical strength can be ensured for the magnet 14 that is going to be displaced to the outer peripheral side during the rotation of the rotor 10, and the occurrence of vibration and noise and the decrease in the fatigue strength of the rotor 10 can be suppressed. Can do.
Moreover, when the rotor 10 is provided in a vehicular electric motor that is used as a driving source of a vehicle such as a hybrid vehicle or a fuel cell vehicle, for example, depending on the usage environment of the vehicular driving source, the operating state of the vehicular electric motor, or the like. In order to suppress an increase in the thermal deformation of the resin 22a, even when the resin 22a having a relatively low viscosity is adopted, the laminated steel plates formed by laminating a plurality of electromagnetic steel plates constituting the yoke 12 are used. The resin 22a before curing can be prevented from penetrating, and an appropriate amount of the resin 22a necessary for filling the gap between the magnet 14 and the magnet mounting hole 13a can be retained by the resin holding back. The magnet 14 can be appropriately fixed only by filling the inside 22.
Further, for example, when the rotor 10 is disassembled and each member constituting the rotor 10 is reused, the magnet is simply removed by simply removing the resin holding back 22 from the magnet mounting hole 13a. The resin 22a for fixing 14 can be separated from the yoke 12, and each member constituting the rotor 10 can be easily reused.

In the above-described embodiment, in step S02, the non-magnetized magnet 14 and the resin holding back 22 into which the resin 22a has not been injected are inserted into the magnet mounting hole 13a independently of each other. For example, as in the first modification of the present embodiment shown in FIG. 5, the resin holding back 22 is bonded to the inner peripheral surface 14 </ b> D of the magnet 14 in advance, and the integrated resin holding back 22 The magnet 14 may be inserted into the magnet mounting hole 13a.
For example, as in the second modified example of the present embodiment shown in FIG. 6, the resin holding back 22 is bonded to a guide member 31 such as a plate in advance, and the inside of the magnet mounting hole 13 a together with the guide member 31. May be inserted.

In the embodiment described above, the resin holding back 22 may be formed to be extendable and contractible.
In this case, the resin holding back 22 may be inserted into the magnet mounting hole 13a by injecting the resin 22a into the resin holding back 22 and expanding the resin holding back 22, for example.
In the third modification of the present embodiment, for example, as shown in FIG. 7, the process proceeds to step S11 after the execution of step S01 described above.
In step S 11, the unmagnetized magnet 14 is inserted into the magnet mounting hole 13 a in which one opening of each magnet mounting hole 13 a of the yoke 12 is closed by one end face plate 15.
Next, in step S12, the resin holding back 22 is arranged in the other opening of each magnet mounting hole 13a of the yoke 12, and the resin 22a is injected into the resin holding back 22 at a predetermined injection pressure. By inflating 22, the resin holding back 22 is inserted into the gap 21 between the inner peripheral surface 14D of the magnet 14 and the inner peripheral side inner surface 13D of the magnet mounting hole 13a. Then, the process proceeds to step S04 described above.

  In the above-described embodiment, the shape of the resin holding back 22 is preliminarily changed, for example, by attaching the magnet 14 to the magnet mounting hole 13a, and the outer peripheral surface 14A of the magnet 14 and the outer peripheral side inner surface 13A of the magnet mounting hole 13a. 2, the gaps 21 formed in the magnet mounting hole 13a, that is, as shown in FIG. 2, the side surfaces 14B and 14C and the inner peripheral surface 14D of the magnet 14 and the circumferential direction of the magnet mounting hole 13a. You may form equivalent to the shape of the clearance gap 21 formed between inner surface 13B, 13C, and inner peripheral side inner surface 13D.

  Further, in the above-described embodiment, the resin holding back 22 includes the both side surfaces 14B and 14C and the inner peripheral surface 14D of the magnet 14, and the circumferential inner surfaces 13B and 13C and the inner peripheral side inner surface 13D of the magnet mounting hole 13a. However, the present invention is not limited to this, and the relatively thin resin holding back 22 is filled with the resin 22a and the outer peripheral surface 14A of the magnet 14 and the magnet mounting hole 13a. The outer peripheral side inner surface 13A may be mounted. In this case, in the yoke 12 in which a plurality of electromagnetic steel plates are laminated, even if a laminated step is formed on the outer peripheral inner surface 13A of the magnet mounting hole 13a, the magnet 14 is directly applied to the laminated step. It is possible to prevent vibration, noise, and the like from occurring due to the contact of the outer peripheral surface 14A.

  In the above-described embodiment, the resin holding back 22 may be formed of a material that is integrated with the resin 22a after the resin 22a is filled.

  In the above-described embodiment, the magnet 14 is mounted in the magnet mounting hole 13a penetrating the yoke 12. However, the present invention is not limited to this. For example, the magnet 14 is formed in a recess opening on the outer peripheral surface 12D of the yoke 12. And a claw portion that abuts the outer peripheral surface 14A of the magnet 14 and regulates the displacement of the magnet 14 to the outer peripheral side may be provided in the opening of the concave portion.

It is a disassembled perspective view of the rotor which concerns on one Embodiment of this invention. It is a principal part top view of the yoke with which the magnet shown in FIG. 1 was mounted | worn. It is a flowchart shown about each process of the manufacturing method of the rotor which concerns on one Embodiment of this invention. FIGS. 4A to 4C are diagrams schematically showing respective steps of inserting a resin holding bag into the magnet mounting hole, filling the resin holding bag with resin, curing the resin, and fixing the magnet. is there. In the 1st modification of this embodiment, it is a figure which shows typically the process of inserting a resin holding back in a magnet mounting hole. In the 2nd modification of this embodiment, it is a figure which shows typically the process of inserting a resin holding back in a magnet mounting hole. It is a flowchart shown about each process of the manufacturing method of the rotor which concerns on the 3rd modification of this embodiment.

Explanation of symbols

10 Rotor 12 York (rotor body)
13 Magnet mounting portion 14 Magnet 22 Resin holding back 22a Resin step S02 Magnet insertion process, back insertion process step S03 Magnet position fixing process step S04 Magnet position fixing process step S11 Magnet insertion process step S12 Back insertion process, magnet position fixing process

Claims (5)

A rotor in which a magnet is mounted on a magnet mounting portion provided in the rotor body,
Between the inner surface of the magnet mounting part and the surface of the magnet, a resin holding back filled with resin is provided,
The resin bag presses the magnet toward the inner surface of the magnet mounting portion. A method for manufacturing a rotor in which a magnet is mounted on a magnet mounting portion provided in a rotor body,
A magnet insertion step of inserting a magnet into the magnet mounting portion;
A back insertion step of inserting a resin holding back that can be filled with resin into the magnet mounting portion;
The resin is filled in the resin holding bag, and the magnet is positioned at a position shifted to the outer peripheral side in the magnet mounting portion by the pressing force that the resin holding bag is deformed and presses the magnet. And a magnet position fixing step of fixing the magnet in the magnet mounting portion. 3. The method for manufacturing a rotor according to claim 2, wherein in the magnet insertion step and the back insertion step, the resin holding back bonded to the magnet is inserted into the magnet mounting portion together with the magnet. 3. The method of manufacturing a rotor according to claim 2, wherein in the back insertion step, the resin holding back held by the guide member is inserted into the magnet mounting portion together with the guide member. 3. The resin holding bag can be deformed into a shape equivalent to a space portion between a surface of the magnet positioned in the magnet position fixing step and an inner surface of the magnet mounting portion. A method for producing a rotor as described in 1.

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