WO2012124283A1 - Rotor à aimant lié, procédé de fabrication de celui-ci, et moteur mettant en œuvre celui-ci - Google Patents

Rotor à aimant lié, procédé de fabrication de celui-ci, et moteur mettant en œuvre celui-ci Download PDF

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Publication number
WO2012124283A1
WO2012124283A1 PCT/JP2012/001488 JP2012001488W WO2012124283A1 WO 2012124283 A1 WO2012124283 A1 WO 2012124283A1 JP 2012001488 W JP2012001488 W JP 2012001488W WO 2012124283 A1 WO2012124283 A1 WO 2012124283A1
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WO
WIPO (PCT)
Prior art keywords
bonded magnet
rotor
molded body
rotor core
magnet molded
Prior art date
Application number
PCT/JP2012/001488
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English (en)
Japanese (ja)
Inventor
弘紀 浅井
Original Assignee
パナソニック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2012124283A1 publication Critical patent/WO2012124283A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets

Definitions

  • the present invention relates to a bonded magnet rotor, a manufacturing method thereof, and a motor including the same.
  • Permanent magnets that make up one of the motor parts are used in various forms as shown below, depending on the application and specifications.
  • a rotor formed by fixing a permanent magnet on the surface of a rotor core and a rotor formed by arranging and fixing a permanent magnet of a predetermined shape inside the rotor core.
  • the permanent magnet to be fixed is selected from many types of materials such as sintered magnets and bonded magnets having different magnetic properties according to the required motor performance.
  • shape of the permanent magnet various shapes such as an arc-shaped tile-shaped magnet, a plate-shaped magnet, or a ring magnet are used.
  • permanent magnets are used in a wide range, such as a type of motor in which a permanent magnet is fixed to the bracket side of a motor and a rotor is rotated using a field generated by the permanent magnet.
  • this type of permanent magnet is mainly fixed by an adhesive method in which the rotor core or bracket and the permanent magnet are fixed using an adhesive.
  • FIG. 5A is a plan view for explaining a conventional rotor bonding method.
  • FIG. 5B is a cross-sectional view illustrating a conventional rotor bonding method.
  • an adhesive 22 is filled between the magnet piece 23 and the material to be bonded such as the rotor core 21. Then, the filled adhesive 22 is cured by combining an adhesive method such as curing by heat, anaerobic curing by blocking air, curing by ultraviolet irradiation, or the like, depending on the curing characteristics of the adhesive 22.
  • the rotor core 21 and the magnet piece 23 are bonded and fixed.
  • the following press-fitting method can be applied to an outer rotor type motor.
  • the outer diameter of the bond magnet is formed to be larger than the inner diameter of the rotor frame to be fixed by a predetermined dimension and is press-fitted into the rotor frame.
  • the rotor is configured by being fixed inside the rotor frame by the elastic force of the bond magnet.
  • Patent Document 1 a construction method described in Patent Document 1 is disclosed. That is, the construction method described in Patent Document 1 is a method in which a permanent magnet molded into a ring shape is pressed against the outer peripheral side and is fixed to another ring member. In the case of this method, when the rotor is rotated, a centrifugal force acts on the outside, so that the permanent magnet is pressed against another ring member, and since the permanent magnet is a ring-shaped product, there is no need for high adhesive strength. Conceivable. For this reason, Patent Document 1 does not particularly describe the permanent magnet bonding method.
  • an adhesion method is the mainstream.
  • the partial press-fitting method, the method described in Patent Document 1, and the like are also limitedly selected.
  • the outer diameter of the rotor core is a ring shape because it is a method of fixing to the rotor core by the press-fitting method using the dimensional difference between the rotor core and the bonded magnet described above. It is necessary to design larger than the inner diameter of the bonded magnet. At this time, since the ring-shaped bonded magnet was press-fitted in a direction extending in the radial direction, the fracture strength of the bonded magnet was lowered, which was a practical problem.
  • an adhesive method is essential for the inner rotor type rotor with a tile-shaped magnet piece fixed.
  • problems inherent to the adhesive such as variations in the accuracy of the bonding position of individual tile-shaped magnet pieces, eccentricity due to bonding displacement, variations in outer diameter caused by variations in bonding thickness, and the like.
  • the rotor cannot be formed with high accuracy.
  • high adhesive strength is required so that the magnet pieces do not scatter due to centrifugal force or the like.
  • the method of manufacturing a bonded magnet rotor of the present invention includes a step of forming a bonded magnet molded body, a step of arranging the bonded magnet molded body on the outer peripheral surface of the rotor core, and a step of arranging a crimping jig on the outer peripheral side of the bonded magnet molded body, A step of maintaining the bonded magnet molded body at a thermosetting temperature, and a step of cooling the crimping jig to contract in the inner diameter direction.
  • the magnet piece of the bonded magnet molded body formed by compression molding can be fixed with almost no gap with the rotor core.
  • the magnetic gap between the rotor core and the bonded magnet molded body can be made substantially zero, magnetic loss can be reduced.
  • the bonded magnet rotor of the present invention is formed by the method for manufacturing the bonded magnet rotor. Thereby, a bonded magnet rotor with high dimensional accuracy can be realized.
  • the motor of the present invention includes at least a stator and the bonded magnet rotor. As a result, a motor that can be driven with high efficiency by minimizing the gap with the stator and having a high operating point can be realized.
  • FIG. 1 is a plan view showing an example of a bonded magnet rotor configured using the bonded magnet molded body according to Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart illustrating a method for manufacturing the bonded magnet rotor in the first embodiment of the present invention.
  • FIG. 3A is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 3B is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 3C is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 3A is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 3B is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 3D is a schematic perspective view illustrating the method for manufacturing the bonded magnet rotor in the first embodiment of the present invention.
  • FIG. 4A is a plan view for explaining an arrangement step in the method of manufacturing the bonded magnet rotor shown in FIG. 3C.
  • FIG. 4B is a plan view for explaining a contraction step in the method of manufacturing the bonded magnet rotor shown in FIG. 3D.
  • FIG. 5A is a plan view for explaining a conventional rotor bonding method.
  • FIG. 5B is a cross-sectional view illustrating a conventional rotor bonding method.
  • FIG. 1 is a plan view showing an example of a bonded magnet rotor configured using the bonded magnet molded body according to Embodiment 1 of the present invention.
  • a bonded magnet rotor 10 includes a bonded magnet molded body 12 made of, for example, 8 poles, which is fixed to the outer periphery of a rotor core 11 made of a structure in which, for example, silicon steel plates are laminated.
  • each bonded magnet molded body 12 is composed mainly of NdFeB-based magnetic powder and SmFeN-based magnetic powder that are anisotropically formed so as to have an easy magnetization axis in one axial direction, for example, a bonded magnet having eight poles. It is formed in an arc shape corresponding to one pole of the rotor.
  • the surface of the rotor core 11 to which the bonded magnet molded body 12 is bonded has an unevenness corresponding to the thickness of each silicon steel plate because the cross-sectional direction of the laminated silicon steel plate is the outer peripheral surface of the rotor core 11. Yes. Therefore, when the bonded magnet molded body 12 is fixed to the rotor core by the crimping method described in the following manufacturing method, the unevenness on the outer peripheral surface of the rotor core 11 is useful and preferable. Further, the unevenness of the bonding surface between the bonded magnet molded body 12 and the rotor core 11 is an anchor with a binder component such as a resin in the partially bonded bonded magnet molded body 12 in the thermosetting of the bonded magnet molded body 12 described below. Increase the effect. As a result, the adhesive force between the bonded magnet molded body 12 and the rotor core 11 is improved, and the fixing strength can be increased.
  • a binder component such as a resin in the partially bonded bonded magnet molded body 12 in the thermosetting of
  • a motor that can be driven with high efficiency can be manufactured by combining the above-described bonded magnet rotor and the stator.
  • FIG. 2 is a flowchart for explaining a method for manufacturing a bonded magnet rotor according to the first embodiment of the present invention.
  • 3A to 3D are schematic perspective views for explaining the method for manufacturing the bonded magnet rotor according to the first embodiment of the present invention.
  • FIG. 4A is a plan view for explaining an arrangement step in the method of manufacturing the bonded magnet rotor shown in FIG. 3C.
  • FIG. 4B is a plan view for explaining a contraction step in the method of manufacturing the bonded magnet rotor shown in FIG. 3D.
  • a bonded magnet compound is formed by the following method (step S10).
  • the anisotropic NdFeB magnetic powder and a novolak type epoxy resin which is a thermosetting resin having a softening temperature of 80 ° C., for example, dissolved in acetone are sufficiently mixed with a kneader. Thereafter, acetone is vaporized and evaporated to form an epoxy resin film on the surface of the NdFeB magnetic powder.
  • SmFeN fine powder and a novolac type epoxy resin having a softening temperature of 80 ° C. dissolved in acetone are mixed with a kneader. Thereafter, acetone is vaporized and evaporated to form an epoxy resin film on the surface of the SmFeN fine powder.
  • a mixture is prepared by mixing NdFeB magnetic powder and SmFeN fine powder coated with epoxy resin, polyamide resin for imparting flexibility and adhesiveness, and a lubricant with a mixer or the like.
  • the mixing ratio of the NdFeB magnetic powder and the SmFeN fine particles is, for example, 3: 2.
  • the epoxy resin is 1.1% by weight (wt%)
  • the polyamide resin and the lubricant are 2.3% by weight (wt%).
  • the mixing ratio, the weight ratio, and the like are not limited to the above values and are changed according to required characteristics.
  • the mixture is continuously put into a gap between heated rolls, which is a kneading device, for example, and kneaded to prepare a kneaded product.
  • the polyamide resin is softened and kneaded into a mixture.
  • the temperature of the roll at the time of kneading is heated to 140 ° C., for example.
  • an extruder etc. can be used besides the method by the said roll.
  • the kneaded material obtained by kneading the magnetic powder material and the polyamide resin is cooled to room temperature, and then pulverized or crushed to prepare, for example, a granular powder having a particle size of 350 ⁇ m or less.
  • an imidazole fine powder curing agent having a curing start temperature of 170 ° C. is added to and mixed with the granular powder to produce a bonded magnet compound.
  • the bonded magnet molded body 12 is formed using the bonded magnet compound (step S20).
  • a bond magnet compound is filled in a cavity of an arc-shaped mold.
  • the mold filled with the bond magnet compound is disposed between the magnetic poles of the magnetic field generator having a magnetic pole for generating a magnetic field in order to orient it in an arbitrary direction.
  • a magnetic field is formed between the magnetic poles of the magnetic field generator, and compression molding is performed using double-sided punches in the orientation magnetic field.
  • compression molding is performed, for example, under the conditions of a mold temperature of 160 ° C., a molding pressure of 150 MPa, an orientation magnetic field of 1.3 MA / m, and a molding time of 30 seconds.
  • the magnetic field orientation molding is performed by, for example, orthogonal magnetic field molding.
  • the arc-shaped and tile-shaped bonded magnet molded body 12 in which the orientation directions of the magnetic particles of the bonded magnet compound are aligned in a certain direction is formed in an uncured state. Since the curing start temperature of the curing agent in the bonded magnet compound is 170 ° C., it is molded in an uncured state by molding the bonded magnet molded body 12 at a mold temperature of 160 ° C.
  • the mold is demagnetized in the above state by, for example, a demagnetizing method in which an alternating magnetic field is applied to gradually attenuate the magnetic field strength. This is for preventing adhesion of the magnetic powder to the mold in the subsequent steps.
  • an uncured arc-shaped tile-shaped bonded magnet molded body 12 is disposed on the surface of the rotor core 11 and temporarily fixed.
  • the temporary fixing is generally performed by directly bonding the bonded magnet molded body 12 to a rotor core made of a structure in which silicon steel plates are laminated through an adhesive for temporary fixing.
  • the temporary fixing jig 14 and the temporary fixing jig 14 at high temperatures are caused by the difference in linear expansion coefficient due to the difference in material between the temporary fixing jig 14 and the rotor core 11.
  • a difference occurs in the outer diameter of the rotor core 11.
  • the outer diameter of the temporary fixing jig 14 is set to the rotor core. 11 is set larger than the outer diameter.
  • the uncured bonded magnet molded body 12 is formed in a ring shape for the number of poles necessary for the outer peripheral surface of the temporary fixing jig 14 (in this embodiment, 8 poles). Deploy.
  • the uncured bonded magnet molded body 12 is partially magnetized by magnetization and temporarily fixed to a temporary fixing jig 14 based on, for example, an iron material through a magnetic attractive force (step S30). Since the uncured bonded magnet molded body 12 contains a resin material such as an epoxy resin or a polyamide resin as a constituent, the bonded magnet molded body 12 does not collapse due to magnetization. At this time, if the effects of the present invention described below are not affected, the uncured bonded magnet molded body 12 and the temporary fixing jig 14 may be temporarily fixed using a small amount of temporary fixing adhesive.
  • the linear expansion coefficient that is larger than the linear expansion coefficient of the rotor core 11 for example, 13 ⁇ 10 ⁇ 6 (/ ° C. in the case of silicon steel plate)), for example, 26 ⁇ 10 ⁇ 6 (/ ° C.).
  • the crimping jig 13 and the rotor core 11 are arranged concentrically inside the crimping jig 13 made of an aluminum material having a coefficient.
  • the bonded magnet molded body 12 temporarily fixed to the temporary fixing jig 14 is disposed concentrically so as to overlap the rotor core 11.
  • at least the rotor core 11 and the crimping jig 13 are heated in advance to, for example, 170 ° C.
  • the linear expansion coefficient of the crimping jig 13 is about twice the linear expansion coefficient of the rotor core 11, when the crimping jig 13 and the rotor core 11 are heated to 170 ° C., the crimping jig 13 is interposed between the crimping jig 13 and the rotor core 11. A space 16 is formed.
  • the crimping jig 13 and the rotor core 11 are set to have a predetermined dimension and shape in which the space 16 is formed slightly larger than the radial width (thickness) of the bonded magnet molded body 12 to be inserted.
  • the difference between the outer diameter dimension of the rotor core 11 and the inner diameter dimension of the crimping jig 13 is larger than the radial width of the bonded magnet molded body 12 fixed in a ring shape to the temporary fixing jig 14 at least at room temperature (for example, 20 ° C.).
  • room temperature for example, 20 ° C.
  • a ring-shaped extrusion tool 15 for inserting the bonded magnet molded body 12 into a space 16 formed by the outer peripheral surface of the rotor core 11 and the inner peripheral surface of the crimping jig 13 is inserted from above the temporary fixing jig 14. To do.
  • the bonded magnet molded body 12 is pressed along the temporary fixing jig 14 with the extrusion jig 15, and the gap between the outer peripheral surface of the rotor core 11 and the inner peripheral surface of the crimping jig 13 is reached.
  • the bonded magnet molded body 12 is slid into the space 16 and temporarily fixed (step S40).
  • the magnetized bonded magnet molded body 12 is magnetically applied to the rotor core 11 mainly composed of an iron material such as a silicon steel plate. Temporarily fixed via suction force. Thereby, as shown in FIG.
  • the bonded magnet molded body 12 is disposed between the outer peripheral surface of the rotor core 11 and the inner peripheral surface of the crimping jig 13. At this time, a gap 17 is formed between the inner peripheral surface of the crimping jig 13 and the outer peripheral surface of the bonded magnet molded body 12.
  • the space 16 between the rotor core 11 and the crimping jig 13 into which the bonded magnet molded body 12 is inserted is heated at, for example, 170 ° C., because the rotor core 11 and the crimping jig 13 are heated. It is larger than the radial width of the bonded magnet molded body 12. As a result, the gap 17 is formed even if the bonded magnet molded body 12 is inserted into the space 16.
  • the extruding jig 15 and the temporary fixing jig 14 shown in FIG. 3C are removed, and in the thermostatic chamber in an arrangement state having a gap 17 between the inner peripheral surface of the crimping jig 13 and the outer peripheral surface of the bonded magnet molded body 12.
  • the temperature is maintained at 170 ° C. for about 10 minutes (step S50).
  • a resin component other than the powder of the bonded magnet constituting the bonded magnet molded body 12 for example, an epoxy resin or a polyamide resin is softened, and a part of the resin component is in a molten state and the curing agent starts to be cured.
  • step S60 forcibly cools to room temperature (step S60).
  • the resin component that has oozed out between the bonded magnet molded body 12 and the rotor core 11 is cured.
  • the inner diameter of the crimping jig 13 disposed on the outer peripheral side of the bonded magnet molded body 12 contracts as the temperature of the crimping jig 13 decreases to room temperature.
  • the gap 17 shown in FIG. 4A is eliminated, and the outer periphery of the bonded magnet molded body 12 is compressed to the rotor core 11 side.
  • the rotor core 11 and the bonded magnet molded body 12 are fixed in close contact so as to follow the surface of the rotor core 11 without a gap.
  • the bonded magnet rotor formed by tightly fixing the bonded magnet molded body 12 to the rotor core 11 from the crimping jig 13 is released from the crimping jig 13.
  • the releasability with the resin is good and the adherence with the resin is small.
  • the crimping jig 13 is preferably released at room temperature in order to simplify the manufacturing process and shorten the process cycle. For example, after the temperature of the crimping jig is raised to about 70 ° C., the bonded magnet is released. The rotor may be released. Thereby, since the inner diameter of the crimping jig 13 having a linear expansion coefficient larger than that of the rotor core 11 is expanded in the radial direction from the bonded magnet rotor due to the temperature rise, the release of the crimping jig 13 becomes easier.
  • the bonded magnet rotor 10 of the present embodiment is manufactured by the manufacturing method described above.
  • the bonded magnet rotor of the present embodiment has a rotor core made of a silicon steel plate having an outer diameter of 47 mm, and a bonded magnet molded body to be pressed has a thickness of 1.5 mm.
  • the inner diameter of the crimping jig made of aluminum disposed outside the bonded magnet rotor is about 50 mm.
  • the amount of change in the inner diameter of the crimping jig is about 0.2 mm, which is obtained by multiplying the temperature change by the linear expansion coefficient.
  • the amount of change in the outer diameter of the rotor core is similarly about 0.1 mm.
  • the change amount with respect to the temperature change of the outer diameter of the rotor core arranged on the inner diameter side of the bonded magnet molded body to be bonded and the inner diameter of the crimping jig arranged on the outer diameter side is different.
  • the bonded magnet molded body and the crimping jig fixed to the rotor core at the thermosetting temperature are cooled, and the bonding and crimping of the bonded magnet molded body to the rotor core are simultaneously performed using the difference in deformation. It can be carried out. Thereby, a bonded magnet rotor can be formed efficiently.
  • the internal diameter of the crimping jig increases by about 0.1 mm when the temperature is raised to 70 ° C.
  • the crimping jig can be more easily released from the bonded magnet rotor. It is also effective to coat the surface in contact with the magnet of the jig arranged on the outer diameter side with a material having low adhesion to the resin.
  • the outer periphery of the bonded magnet molded body is always formed in contact with the crimping jig during the cooling from thermosetting to form the bonded magnet rotor. That is, the dimensional accuracy of the bonded magnet rotor is regulated by the size and shape of the crimping jig disposed on the outer diameter side, and is formed reflecting the shape accuracy of the crimping jig.
  • the roundness of the bonded magnet rotor can achieve high roundness depending on the roundness of the inner diameter of the crimping jig. That is, if the roundness of the inner diameter of the crimping jig is high, the roundness of the bonded magnet rotor can be increased.
  • the roundness can be increased to about 1 ⁇ 2 or less from the conventional 100 to 150 ⁇ m to 50 ⁇ m or less.
  • the bonded magnet molded body is cured and fixed by the crimping jig so as to follow the outer peripheral surface of the rotor core at the same time as the bonded magnet molded body is cured, thereby forming the bonded magnet rotor.
  • the magnetic gap of a bond magnet rotor and a stator can be eliminated substantially. As a result, it is possible to reduce the magnetic loss between the bonded magnet rotor and the stator and to improve the performance of the motor.
  • the peak value of the surface magnetic flux waveform is improved by about 5%.
  • a structure in which a silicon steel plate is laminated on the rotor core and fixed by caulking has been described as an example, but the present invention is not limited to this.
  • the rotor core is made of a material mainly composed of iron having good soft magnetic characteristics.
  • the bond magnet rotor having eight poles has been described as an example.
  • the present invention is not limited to this, and the number of poles may be arbitrarily configured.
  • the amount of surface magnetic flux can be improved by fixing the bonded magnet molded body and the rotor core while minimizing the magnetic gap. Therefore, it is useful for a device in which a magnetic circuit such as a motor is formed inside, which requires a high surface magnetic flux.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Le procédé de fabrication de rotor à aimant lié de l'invention comporte : une phase de formation de corps moulé d'aimant lié; une phase de disposition de ce corps moulé d'aimant lié sur la surface périphérique externe d'un noyau de rotor, et de disposition d'un gabarit d'ajustement par pression côté périphérique externe du corps moulé d'aimant lié; une étape de maintien du corps moulé d'aimant lié à une température de thermodurcissement; et une étape de réduction dans la direction radiale interne par refroidissement du gabarit d'ajustement par pression. Ainsi, il est possible de fixer une pièce d'aimant du corps moulé d'aimant lié formée par moulage par compression, dans un état dans lequel il n'y a sensiblement pas d'espace avec le noyau de rotor. Par conséquent, il est possible de réduire les pertes de magnétisme, afin d'éliminer sensiblement l'espace magnétique entre le noyau de rotor et le corps moulé d'aimant lié.
PCT/JP2012/001488 2011-03-14 2012-03-05 Rotor à aimant lié, procédé de fabrication de celui-ci, et moteur mettant en œuvre celui-ci WO2012124283A1 (fr)

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JP2011-055116 2011-03-14
JP2011055116 2011-03-14

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018148694A (ja) * 2017-03-06 2018-09-20 三菱電機株式会社 永久磁石回転子、永久磁石回転子製造用の金型および永久磁石回転子の製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001513315A (ja) * 1997-01-29 2001-08-28 ターボコープ リミテッド 高速ロータシャフトの改善
JP2011015571A (ja) * 2009-07-03 2011-01-20 Panasonic Corp ロータの製造方法、モータおよびそれを備えた電子機器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001513315A (ja) * 1997-01-29 2001-08-28 ターボコープ リミテッド 高速ロータシャフトの改善
JP2011015571A (ja) * 2009-07-03 2011-01-20 Panasonic Corp ロータの製造方法、モータおよびそれを備えた電子機器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018148694A (ja) * 2017-03-06 2018-09-20 三菱電機株式会社 永久磁石回転子、永久磁石回転子製造用の金型および永久磁石回転子の製造方法

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