JP5981363B2 - Rotor and rotor manufacturing method - Google Patents

Description

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

  Conventionally, for example, a rotor is known in which a ring magnet is fixed to the outside of a rotor core using an adhesive (see, for example, Patent Document 1).

JP 2008-220044 A

  By the way, in the rotor as described above, when the rotor core and the ring magnet are fixed by the adhesive, for example, when an air trap occurs, the adhesive is biased. Thereby, for example, the concentricity of the magnet may be reduced, leading to deterioration of cogging torque and increase of magnetic vibration.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotor and a method of manufacturing the rotor that can reduce air accumulation during adhesive fixing.

Rotor, the inner circumferential surface of the ring magnet on the outer circumferential surface of the rotor core a rotor comprising bonded and fixed spirally in the axial direction, the inner peripheral surface of the ring magnet and the outer peripheral surface of the rotor core and to solve the aforementioned problems between, and have a bonded portion where the adhesive is formed by a plurality circumferentially applied so as to be axially separated spirally for bonding and fixing the rotor core and the ring magnet, an outer circumferential surface of the rotor core and On the peripheral surface having the adhesive fixing portion in the inner peripheral surface of the ring magnet, a portion between the adhesive fixing portions in the axial direction becomes a spiral non-adhesive fixing portion that is not adhesively fixed by the adhesive. The non-adhesive fixing portion has a groove portion that is recessed in a radial direction from the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet in a radial direction from the peripheral surface having the adhesive fixing portion. It is formed in a spiral shape along the bonded portion.

  According to this configuration, the rotor core and the ring magnet can be bonded and fixed because the adhesive fixing portion formed by spirally applying the adhesive is provided on at least one of the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet. . At this time, since the adhesive fixing portion (adhesive) is spiraled so as to be spaced apart in the axial direction, the spaced apart part is also spiraled. Accordingly, air can be extracted from the adhesive fixing portion (adhesive) through the spaced apart portions, so that occurrence of air accumulation in the adhesive fixing portion (adhesive) can be reduced.

According to this configuration, it is possible to pull out from the bonded portion of air by utilizing a groove (adhesive). For this reason, generation | occurrence | production of an air pocket can be reduced more reliably in an adhesion fixing part (adhesive).

In the rotor, of the outer peripheral surface or inner peripheral surface of the ring magnet of the rotor core, wherein the circumferential surface of it is not Tei formed groove, the fitting portion which is fitted into the groove is formed Tei It is preferable.

A rotor that solves the above problems is a rotor that is formed by spirally bonding and fixing an inner peripheral surface of a ring magnet in an axial direction to an outer peripheral surface of a rotor core, and includes an outer peripheral surface of the rotor core and an inner peripheral surface of the ring magnet. Between the outer periphery of the rotor core and the outer peripheral surface of the rotor core. On the peripheral surface having the adhesive fixing portion in the inner peripheral surface of the ring magnet, a portion between the adhesive fixing portions in the axial direction becomes a spiral non-adhesive fixing portion that is not adhesively fixed by the adhesive. The non-adhesive fixing portion is formed in the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet without being recessed in the radial direction with respect to the peripheral surface having the adhesive fixing portion. And it has a continuous surface with the surface.
According to this configuration, the rotor core and the ring magnet can be bonded and fixed because the adhesive fixing portion formed by spirally applying the adhesive is provided on at least one of the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet. . At this time, since the adhesive fixing portion (adhesive) is spiraled so as to be spaced apart in the axial direction, the spaced apart part is also spiraled. Accordingly, air can be extracted from the adhesive fixing portion (adhesive) through the spaced apart portions, so that occurrence of air accumulation in the adhesive fixing portion (adhesive) can be reduced.

A rotor manufacturing method that solves the above problem is a rotor manufacturing method in which the inner peripheral surface of a ring magnet is helically bonded and fixed in the axial direction to the outer peripheral surface of the rotor core, the outer peripheral surface of the rotor core and After at least one of the inner circumferential surface of the ring magnet was spirally coated with an adhesive so as to be spaced apart in the axial direction, at least one of the rotor core and the ring magnet was spirally coated. The rotor core is inserted into the ring magnet while being relatively rotated along the adhesive, and the ring magnet and the rotor core are fixed by the adhesive.

  According to this configuration, the rotor core and the ring magnet can be bonded and fixed because the adhesive fixing portion formed by spirally applying the adhesive is provided on at least one of the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet. . At this time, since the adhesive fixing portion (adhesive) is spiraled so as to be spaced apart in the axial direction, the spaced apart part is also spiraled. Accordingly, air can be extracted from the adhesive fixing portion (adhesive) through the spaced apart portions, so that occurrence of air accumulation in the adhesive fixing portion (adhesive) can be reduced.

  According to this configuration, by inserting the rotor core into the ring magnet while relatively rotating at least one of the rotor core and the ring magnet along the spirally applied adhesive, It is possible to more reliably maintain the state where the adhesive is separated from one end to the other end. Moreover, even if the adhesive expands due to heat or the like, the volume expanded due to the presence of the air layer can be released, so that the magnet or the like can be prevented from being damaged by the expansion force of the adhesive.

  In the rotor manufacturing method, a groove portion that is recessed in a radial direction from an application surface on which the adhesive is applied is located between the application surfaces in the axial direction on the outer peripheral surface of the rotor core or the inner peripheral surface of the ring magnet. The outer peripheral surface of the rotor core or the inner peripheral surface of the ring magnet is continuously formed in a spiral shape and is fitted with the groove portion along the groove portion along the groove portion. A fitting portion that is guided in a spiral shape is formed, and at least one of the rotor core and the ring magnet is formed along the adhesive applied in a spiral shape by the fitting portion and the groove portion. The rotor core is preferably inserted into the ring magnet while being relatively rotated.

According to this configuration, since the fitting portion is formed on the outer peripheral surface of the rotor core or the inner peripheral surface of the ring magnet on the peripheral surface where the groove portion is not formed, the fitting portion is moved along the groove portion. Therefore, when the rotor core and the ring magnet are assembled, they can be assembled (inserted) while relatively rotating. Thereby, the state which the groove part which is an air layer between adhesives connected from one end to the other end can be maintained more reliably. Moreover, even if the adhesive expands due to heat or the like, the expanded volume can be released due to the presence of the groove (air layer), so that the magnet or the like can be prevented from being damaged by the expansion force of the adhesive.
In the method for manufacturing a rotor described above, a portion between the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet on which the adhesive is applied is a portion between the application surfaces on which the adhesive is applied in the axial direction. The non-application surface is a spiral non-application surface that is not coated, and the non-application surface is radially recessed with respect to the outer peripheral surface of the rotor core and the outer peripheral surface of the ring magnet to which the adhesive is applied. The surface is continuous with the application surface.

  According to the rotor and the method of manufacturing a rotor of the present invention, it is possible to reduce air accumulation during adhesive fixing.

It is sectional drawing of the motor in one Embodiment. It is sectional drawing of a rotor. It is a front view of a rotor core. It is sectional drawing of a ring magnet. It is a front view of the rotor core in another example.

Hereinafter, an embodiment of the motor will be described.
As shown in FIG. 1, the case 11 of the motor 10 of this embodiment has a case main body 11a having a bottomed cylindrical shape and an end frame 11b that closes an opening of the case main body 11a. A stator 12 is provided on the inner peripheral surface of the case body 11a.

  As shown in FIG. 1, the stator 12 has a substantially cylindrical shape and includes a stator core 13 and a coil 14. The stator core 13 includes a plurality of tooth portions 13a (only two are shown in FIG. 1) disposed along the circumferential direction. Each teeth portion 13a is integrally formed by being connected on the outer peripheral side of the stator core 13. A coil 14 is wound around each tooth portion 13 a via an insulator 15.

  As shown in FIG. 1, a terminal holder 16 is fixed to the stator 12 so as to cover one end surface in the axial direction on the end frame 11b side. The terminal holder 16 is formed in a substantially cylindrical shape with an insulating resin. The terminal holder 16 includes a power supply terminal 16a. The coil 14 is connected to the power supply terminal, and is electrically connected to a control circuit (not shown) and the power supply terminal 16a.

  As shown in FIG. 1, a rotor 17 is provided inside the stator 12. The rotor 17 is disposed with a certain gap between the inner surface of the stator core 13. The rotor 17 includes a rotating shaft 18, a rotor core 19 fixed to the rotating shaft 18, a ring magnet 20 disposed on the outer periphery of the rotor core 19, and a cover 21 that covers the rotor core 19 and the ring magnet 20.

  The rotating shaft 18 is rotatably supported at both ends by a pair of bearings 22 and 23. One bearing 22 is provided at the center in the radial direction of the bottom of the case body 11a, and the other bearing 23 is provided at the center in the radial direction of the end frame 11b. The pair of bearings 22 and 23 are disposed so as to sandwich the stator 12 and the terminal holder 16 in the axial direction.

  As shown in FIGS. 2 and 3, the rotor core 19 includes a rotor core main body 30 and a flange portion 31. The rotor core body 30 has a substantially cylindrical shape, and a spiral groove 32 is formed on the outer peripheral surface 30a. The groove 32 is formed such that the center of mass in the radial direction of the rotor core 19 is on the axis L1. In addition, an adhesive fixing portion 40 is provided between the outer peripheral surface 30 a of the rotor core body 30 and the inner peripheral surface 20 a of the ring magnet 20. The adhesive fixing portion 40 is for adhesively fixing the rotor core 19 and the ring magnet 20. The adhesive fixing portion 40 is formed by applying an adhesive in a plurality of rounds (substantially four rounds in the present embodiment) spirally so as to be spaced apart at substantially equal intervals in the axial direction.

As shown in FIG. 2, an insertion hole 30 b through which the rotary shaft 18 is inserted is formed in the center of the rotor core body 30 in the radial direction of the rotary shaft 18.
Further, as shown in FIG. 1, the rotor core 19 is fixed to the rotating shaft 18 so that the ring magnet 20 fixed to the outer periphery of the rotor core 19 faces the stator 12. Incidentally, since the stator 12 is housed in the case 11 together with the terminal holder 16, it is fixed at a position closer to the bottom of the case body 11a than the center between the bearings 22 and 23. Therefore, the rotor core 19 is fixed at a position shifted from the center between the two bearings 22 and 23 on the rotary shaft 18 along the axis L1 toward the bottom side of the case main body 11a (on the side opposite to the terminal holder 16). The flange 31 extends from the axial end of the rotor core body 30 toward the radially outer side, and has an annular shape. The outer diameter of the collar portion 31 is substantially constant in the axial direction. Further, a taper surface 30c is formed at the end of the rotor core main body 30 on the side of the flange portion 31 such that the diameter becomes smaller toward the end, and the ring magnet 20 is formed from the end side where the taper surface 30c is formed. Can be assembled.

As shown in FIG. 2, a cylindrical ring magnet 20 is disposed on the outer periphery of the rotor core main body 30.
As shown in FIG. 4, the ring magnet 20 is assembled and bonded and fixed to the rotor core 19 in a state where an adhesive is spirally applied to the application surface 20b of the inner peripheral surface 20a in advance. On the inner peripheral surface 20a of the ring magnet 20, a fitting protrusion 20c that protrudes radially inward is formed on one end side in the direction of the axis L1.

  As shown in FIG. 1, the cover 21 is made of a non-magnetic material and includes a cylindrical portion 21a, a bottom portion 21b, and a bent portion 21c. The axial length of the cylindrical portion 21 a is formed to be equal to the axial length of the rotor core 19. Therefore, the outer peripheral surface 31a of the flange portion 31 and the outer peripheral surface 20d on the radially outer side of the ring magnet 20 are covered with the cylindrical portion 21a. The bottom portion 21 b of the cover 21 extends from one end in the axial direction of the cylindrical portion 21 a toward the inside in the radial direction, and comes into contact with the end surface 30 e of the rotor core body 30.

  As shown in FIG. 2, the bent portion 21c extends from the axial end on the opposite side to the bottom portion 21b of the cylindrical portion 21a over the entire circumference, and has a constant width at any location in the circumferential direction. . The ring magnet 20 is disposed on the outer periphery of the rotor core main body 30 and the bent portion 21c is attached to the rotor core 19 after the cover 21 is attached to the end surface 31b of the flange portion 31 on the side opposite to the ring magnet 20. Folded radially inward. When the bent portion 21c is bent in this manner, the inner peripheral surface of the cylindrical portion 21a is brought into contact with the outer peripheral surface 31a of the flange portion 31 and the outer peripheral surface 20d on the radially outer side of the ring magnet 20 in the cover 21. The ring magnet 20 is firmly fixed by the rotor core 19.

  As shown in FIG. 1, the motor 10 of this embodiment has a resolver 35. The resolver 35 includes a resolver rotor 36 and a resolver stator 37. The resolver 35 is for detecting the rotational position of the rotor 17. The resolver rotor 36 is fixed to the rotary shaft 18 of the rotor 17 at a position spaced from the flange 31. The resolver stator 37 is fixed to the end frame 11 b so as to face the resolver rotor 36 on the outer peripheral side of the resolver rotor 36. The control circuit supplies a voltage to the stator 12 according to the rotational position of the rotor 17 detected by the resolver 35.

  In the motor 10 configured as described above, a rotating magnetic field is generated in the stator 12 when a voltage is supplied from the control circuit. Then, the rotor 17 is rotated according to this rotating magnetic field.

Next, a method for assembling the ring magnet 20 and the rotor core 19 of the rotor 17 according to the present embodiment (a method for manufacturing the rotor 17) will be described.
An adhesive is spirally applied in advance to the application surface 30 d of the outer peripheral surface 30 a of the rotor core 19 (rotor core body 30) and the application surface 20 b of the inner peripheral surface 20 a of the ring magnet 20. At this time, the adhesive applied to each of the surfaces 30d and 20b is applied along the groove portion 32 so as to be separated in the axial direction.

  Thereafter, the end of the ring magnet 20 on the side of the fitting protrusion 20c and the end of the rotor core body 30 on the side where the tapered surface 30c is formed (the side opposite to the flange 31) are brought close to each other, and the spiral groove 32 is formed. The fitting protrusion 20c is fitted to one end side of the. At this time, since the tapered surface 30c is formed on the rotor core main body 30, the ring magnet 20 on which the fitting projection 20c is formed is extrapolated to easily fit the groove 32 and the fitting projection 20c. It is possible.

  The fitting projection 20c is guided in a spiral manner along the groove 32, so that the ring magnet 20 is inserted and assembled while being rotated relative to the rotor core body 30. Here, by rotating along the groove portion 32, the rotation is performed along the adhesive applied in a spiral shape.

For example, when the fitting protrusion 20 c comes into contact with the other end of the groove 32, the assembly of the ring magnet 20 and the rotor core 19 is completed.
As described above, the present embodiment has the following effects.

  (1) Since the adhesive core 40 and the ring magnet 20 are provided on the outer peripheral surface 30a of the rotor core 19 (rotor core main body 30) and the inner peripheral surface 20a of the ring magnet 20 with the adhesive fixing portion 40 formed by spirally applying an adhesive. It can be adhesively fixed. At this time, since the adhesive fixing portion 40 (adhesive) is spiraled so as to be spaced apart in the axial direction, the spaced apart part is also spiraled. Accordingly, air can be extracted from the adhesive fixing portion 40 (adhesive) through the spaced apart portions, so that occurrence of air accumulation in the adhesive fixing portion 40 (adhesive) can be reduced. . Thereby, for example, since the degree of coincidence (coaxiality) of the respective radial centers when the ring magnet 20 is assembled to the rotor core 19 can be improved, an increase in cogging torque or an increase in vibration can be suppressed. it can. In addition, by suppressing the occurrence of air accumulation, it is possible to ensure the close contact state between the ring magnet 20 and the rotor core 19, and therefore, cracking of the ring magnet 20 can be suppressed.

  (2) On the outer peripheral surface 30a of the rotor core 19 (rotor core main body 30), a groove portion 32 that is recessed in the radial direction from the application surface 30d for applying the adhesive is spirally positioned so as to be positioned between the application surfaces 30d in the axial direction. In this way, air can be extracted from the adhesive fixing portion 40 (adhesive) using the groove 32. For this reason, generation | occurrence | production of an air pocket can be reduced more reliably in the adhesion fixing | fixed part 40 (adhesive).

  (3) Since the fitting projection 20c fitted to the groove 32 is formed on the inner circumferential surface 20a of the ring magnet 20 (the circumferential surface on which the groove is not formed), the fitting projection along the groove 32 is formed. Since 20c can be moved, when assembling the rotor core 19 and the ring magnet 20, they can be assembled (inserted) while relatively rotating. Thereby, the state which the groove part 32 which comprises the air layer between adhesives was connected from the one end to the other end can be maintained more reliably. Further, even if the adhesive expands due to heat or the like, the expanded volume can be released due to the presence of the groove 32 (air layer), so that it is possible to suppress damage to the ring magnet or the like due to the expansion force of the adhesive. it can.

In addition, you may change the said embodiment as follows.
In the above embodiment, the spiral groove 32 is formed in the rotor core 19, but a configuration in which the groove is omitted as shown in FIG. 5 may be adopted. In this case, the fitting part (fitting protrusion) is also omitted. Even in such a case, the ring magnet 20 is assembled to the rotor core body 30 so as to be the same as the state in which the fitting portion and the groove portion exist. That is, it is preferable that the ring magnet 20 is assembled to the rotor core main body 30 by holding the ring magnet 20 with a jig and moving the axis in accordance with the spiral application state of the adhesive of the rotor core 19 and rotating and rotating. .

Alternatively, the groove 32 may be formed on the ring magnet 20 side, and the fitting protrusion 20c may be formed on the rotor core 19 side.
In the above-described embodiment and each of the above-described configurations, the ring magnet 20 is provided with the fitting protrusion 20c that fits with the groove 32. However, the omitted configuration may be adopted.

  In the above embodiment, the adhesive is applied to both the ring magnet 20 and the rotor core 19. However, the adhesive may be applied to at least one of the adhesives and the adhesive fixing portion 40 may be provided.

  In the above embodiment, the ring magnet 20 and the rotor core 19 are assembled while rotating the ring magnet 20 about the axis L1, but the present invention is not limited to this. For example, the ring magnet 20 and the rotor core 19 may be assembled while the rotor core 19 is rotated about the axis L1, or the rotor core 19 and the ring magnet 20 may be assembled while being rotated in directions opposite to each other about the axis L1. Further, both the ring magnet 20 and the rotor core 19 may be assembled without being rotated.

  DESCRIPTION OF SYMBOLS 17 ... Rotor, 19 ... Rotor core, 20 ... Ring magnet, 20a ... Inner peripheral surface, 20c ... Fitting protrusion part (fitting part), 30d ... Application | coating surface, 20d, 30a, 31a ... Outer peripheral surface, 32 ... Groove part, 40 ... Adhesive fixing part.

Claims (6)

A rotor formed by spirally bonding and fixing an inner peripheral surface of a ring magnet in an axial direction to an outer peripheral surface of a rotor core;
Between the inner peripheral surface of the ring magnet and the outer peripheral surface of the rotor core, adhesion adhesive for bonding and fixing the rotor core and the ring magnet comprising a plurality of circumferentially applied so as to be axially separated spirally and have a fixed portion,
On the peripheral surface having the adhesive fixing portion in the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet, the portion between the adhesive fixing portions in the axial direction is not spirally fixed by the adhesive. The non-adhesive fixing portion includes a groove portion that is recessed in a radial direction from the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet and having a peripheral surface having the adhesive fixing portion. A rotor formed in a spiral shape along a fixed portion . The rotor according to claim 1 , wherein
Of the outer peripheral surface or inner peripheral surface of the ring magnet of the rotor core, wherein the circumferential surface of it is not Tei formed groove, characterized in Tei Rukoto fitting portion which is fitted into the groove is formed Rotor. A rotor formed by spirally bonding and fixing an inner peripheral surface of a ring magnet in an axial direction to an outer peripheral surface of a rotor core;
Adhesive formed by applying a plurality of spirals between the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet in a spiral manner so that an adhesive for bonding and fixing the rotor core and the ring magnet is separated in the axial direction. Has a fixed part,
On the peripheral surface having the adhesive fixing portion in the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet, the portion between the adhesive fixing portions in the axial direction is not spirally fixed by the adhesive. The non-adhesive fixing part is an adhesive fixing part, and the non-adhesive fixing part is not circumferentially recessed relative to the peripheral surface having the adhesive fixing part in the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet. A rotor characterized by being a surface continuous with the surface. A rotor manufacturing method in which an inner peripheral surface of a ring magnet is helically bonded and fixed in an axial direction to an outer peripheral surface of a rotor core,
After at least one of the outer surface of the rotor core and the inner peripheral surface of the ring magnet is spirally applied in a spiral manner so that the adhesive is spaced apart in the axial direction, at least one of the rotor core and the ring magnet is A rotor characterized in that the rotor core is inserted into the ring magnet while being relatively rotated along the adhesive applied spirally, and the ring magnet and the rotor core are fixed by the adhesive. Manufacturing method. In the manufacturing method of the rotor according to claim 4 ,
On the outer peripheral surface of the rotor core or the inner peripheral surface of the ring magnet, a groove portion that is recessed in the radial direction from the application surface to which the adhesive is applied is continuously spirally so as to be positioned between the application surfaces in the axial direction. Formed into
On the outer peripheral surface of the rotor core or the inner peripheral surface of the ring magnet, a fitting portion that is fitted with the groove portion and spirally guides along the groove portion is formed on the peripheral surface on which the groove portion is not formed. Is,
The rotor core is inserted into the ring magnet while the fitting portion and the groove portion relatively rotate at least one of the rotor core and the ring magnet along the adhesive applied spirally. A rotor manufacturing method characterized by the above. In the manufacturing method of the rotor according to claim 4,
On the outer peripheral surface of the rotor core and the inner peripheral surface of the ring magnet, the portion between the application surfaces on which the adhesive is applied in the axial direction is a spiral non-coating region where the adhesive is not applied. The non-application surface is an application surface, and the non-application surface is not hollowed in the radial direction with respect to the outer peripheral surface of the rotor core and the peripheral surface of the ring magnet to which the adhesive is applied. A method of manufacturing a rotor, characterized in that the surfaces are continuous.