WO2012119284A1 - Rotor externe de moteur sans balai et son procédé de fabrication - Google Patents

Rotor externe de moteur sans balai et son procédé de fabrication Download PDF

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Publication number
WO2012119284A1
WO2012119284A1 PCT/CN2011/001712 CN2011001712W WO2012119284A1 WO 2012119284 A1 WO2012119284 A1 WO 2012119284A1 CN 2011001712 W CN2011001712 W CN 2011001712W WO 2012119284 A1 WO2012119284 A1 WO 2012119284A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic body
ferromagnetic yoke
shaft
tubular
outer rotor
Prior art date
Application number
PCT/CN2011/001712
Other languages
English (en)
Chinese (zh)
Inventor
刘小波
Original Assignee
上海航天汽车机电股份有限公司
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
Application filed by 上海航天汽车机电股份有限公司 filed Critical 上海航天汽车机电股份有限公司
Publication of WO2012119284A1 publication Critical patent/WO2012119284A1/fr

Links

Classifications

    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • 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
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
    • 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
    • H02K15/16—Centering rotors within the stator; Balancing rotors

Definitions

  • the invention relates to a brushless motor and a manufacturing method thereof, in particular to an outer rotor structure of a brushless motor driven by a DC inverter to a pulsed square wave and a manufacturing method thereof.
  • the structure of the outer rotor of the existing brushless motor comprises a bowl-shaped ferromagnetic yoke, a plurality of magnetic steel fixedly disposed on the inner wall of the ferromagnetic yoke, and a shaft interposed between the ferromagnetic yokes, and the mating coupling is integrated.
  • the ferromagnetic yoke is formed by the extension of the iron plate on the outer rotor casing, and two problems are often caused during the extension process: First, when the casing is extended, the extension of the casing may affect the extension due to the self-material relationship of the casing.
  • an object of the present invention is to provide a brushless motor outer rotor and a manufacturing method thereof, wherein the ferromagnetic yoke adopts a seamless steel pipe, and is molded by using a plastic mold inside and outside, which can effectively improve The processing precision, the technical requirements of the dynamic balance performance of the outer rotor of the brushless motor are ensured, and the processing difficulty and the production efficiency can be greatly reduced.
  • a brushless motor outer rotor which comprises:
  • the inner wall of the plastic body is provided with a plurality of limiting slots corresponding to the notches, and the limiting slots are respectively disposed on the two sides of each of the cutouts;
  • the plurality of magnetic steels are inserted into the limiting slots corresponding to the plastic body, and are bonded and fixed to the tubular ferromagnetic yoke at corresponding notches.
  • the plastic body is generally in the shape of a bowl
  • a lower portion of the plastic body is further formed with a tapered tubular structure having a height h 0 ;
  • the plastic body is formed with a plurality of reinforcing ribs, and the reinforcing ribs are radially arranged from the center of the lower portion of the plastic body.
  • the plastic body is provided with a plurality of heat dissipation holes.
  • the shaft passes through the plastic body
  • a positioning notch is defined in the shaft, and is fixedly connected to the plastic body to limit the rotation and axial movement of the plastic body relative to the shaft.
  • the plastic body is injection molded
  • the injection molding of the injection molded body is performed when the shaft is placed at the center of the tubular ferromagnetic yoke, so that the shaft and the plastic body are integrally connected during injection molding;
  • the shaft is pressed into the plastic body to achieve a mating connection.
  • the invention also provides a method for manufacturing a brushless motor outer rotor, comprising the following steps: Step 1. forming a tubular ferromagnetic yoke by using a seamless steel pipe;
  • Step 2 preparing a shaft, the shaft is axially disposed at a center position of the tubular ferromagnetic yoke; step 3, injection molding to form a plastic body, the plastic body being wrapped around the tubular ferromagnetic yoke, and the inner wall a portion of the inner wall of the tubular ferromagnetic yoke that is not covered by the plastic body, forming a plurality of notches uniformly distributed on the plastic body;
  • the plastic body is integrally molded into a bowl shape, and the lower portion thereof is further formed into a structure having a tapered tube shape or a non-tapered tube shape;
  • the inner wall of the plastic body is further formed with a plurality of limiting slots corresponding to the notches, each The limiting groove is respectively disposed on both side edges of the notch;
  • Step 4 Prepare a number of magnetic steels
  • Step 5 Insert each magnetic steel into the limiting slot of the plastic body, and bond and fix the tubular ferromagnetic yoke in the corresponding notch.
  • the step 2 further includes the step of opening a positioning gap on the shaft
  • the injection molded plastic body is fixedly connected to the positioning notch of the shaft, so that the rotation and axial movement of the plastic body relative to the shaft are restricted by the positioning notch.
  • a plurality of reinforcing ribs 7 are further injection-molded in the plastic body, so that the reinforcing ribs 7 are radially arranged from the center of the lower portion of the plastic body; and a plurality of heat dissipation holes 8 are formed in the plastic body.
  • step 3 after the tubular ferromagnetic yoke is placed in the plastic mold, the shaft is also placed in the plastic mold and disposed through the center of the tubular ferromagnetic yoke, and then the plastic body is injection molded. Connecting the plastic body and the shaft into one piece during injection molding;
  • the plastic body is injection molded, and the shaft corresponding to the center of the tubular ferromagnetic yoke is pressed into the plastic body to realize the cooperation between the plastic body and the shaft. connection.
  • the brushless motor outer rotor of the present invention Compared with the prior art, the brushless motor outer rotor of the present invention and the manufacturing method thereof have the following advantages:
  • the iron yoke of the outer rotor of the brushless motor of the invention adopts a tubular shape and does not need to be extended; and the bowl-shaped plastic body wrapped inside and outside the tubular ferromagnetic yoke is molded by plastic molding, which greatly improves the concentricity of the outer rotor of the brushless motor. Degree and roundness, which effectively improves the dynamic balance performance and ensures the pass rate of the outer rotor of the brushless motor.
  • the manufacturing method of the present invention encloses the plastic body inside and outside the tubular ferromagnetic yoke, and ensures that the injection of the plastic body is in compliance with the relevant technical requirements, and then the processed magnetic steel is bonded to the two.
  • This method can avoid some problems caused by the prior art connecting the magnetic steel and the ferromagnetic yoke before injection molding: for example, if the quick-drying adhesive is used, the magnetic steel is easy to fall off, and the other glue will affect the magnetic steel.
  • the size of the circle; or, the problem of injection molding causes the magnetic steel to be scrapped together to increase the loss; or, because it needs to be put together in the mold, the processing precision of the magnetic steel needs to be improved.
  • the manufacturing of the present invention avoids the difficulty of processing the complicated lock, and the injection molding process is easier to control, saving labor and time; and even if the scrap is formed, the cost is much smaller, and the production cost can be reduced.
  • the invention improves the machining precision and production efficiency of the outer rotor of the brushless motor, and ensures the quality of the outer rotor of the brushless motor.
  • FIG. 1 is a schematic view showing the structure of an outer rotor of a brushless motor according to the present invention.
  • the ferromagnetic yoke of the outer rotor of the brushless motor of the present invention is tubular, and does not need to be extended.
  • a tubular ferromagnetic yoke 4 As shown in Fig. 1, the ferromagnetic yoke of the outer rotor of the brushless motor of the present invention is tubular, and does not need to be extended.
  • tubular ferromagnetic yoke 4 As shown in Fig. 1, the ferromagnetic yoke of the outer rotor of the brushless motor of the present invention is tubular, and does not need to be extended.
  • tubular ferromagnetic yoke 4 As shown in Fig. 1, the ferromagnetic yoke of the outer rotor of the brushless motor of the present invention is tubular, and does not need to be extended.
  • tubular ferromagnetic yoke 4 As shown in Fig. 1, the ferromagnetic yoke of the outer rotor of the brushless
  • a plastic body 5 is formed by injection molding using a plastic mold.
  • the plastic body wrapped around the inner wall portion of the tubular ferromagnetic yoke 4 is evenly distributed with a plurality of notches so that portions of the inner wall of the tubular ferromagnetic yoke 4 which are not covered by the plastic body 5 are exposed from the notches.
  • the plastic body 5 is injection molded with a plurality of limiting grooves corresponding to the number of notches, i.e., the limiting grooves are formed on both side edges of each of the notches.
  • a plurality of magnets 2 are correspondingly inserted into the stopper grooves of the plastic body 5, and the magnet steel 2 and the tubular ferromagnetic yoke 4 are bonded and fixed at the corresponding notches by glue or the like.
  • four of the magnetic steels 2 are provided.
  • the plastic body 5 has a bowl shape as a whole, and the lower portion of the bowl-shaped plastic body 5 can be injection molded into a tapered tube shape or a non-taper tube shape.
  • the shaft 3 is arranged axially through the center of the tubular ferromagnetic yoke 4 and the bowl-shaped plastic body 5.
  • the tubular portion is After the ferromagnetic yoke 4 is placed in the plastic mold, the plastic body 5 may be injection molded when the shaft 3 is placed in the plastic mold and passed through the center of the tubular ferromagnetic yoke 4; or, the injection molding may be performed first. After the plastic body 5, the shaft 3 is pressed into the shaft hole of the plastic body 5 to achieve a mating connection therebetween.
  • a positioning notch 6 can be opened on the shaft 3. Therefore, when the shaft 3 is placed in a plastic mold for injection molding of the plastic body 5, the formed plastic body 5 can be matched with the positioning notch 6 on the shaft 3 at the position of the shaft hole at the lower portion thereof, thereby using the positioning.
  • the notch 6 is restrained to prevent rotation and axial movement of the plastic body 5.
  • a plurality of reinforcing ribs 7 may be injection molded into the bowl-shaped plastic body 5 so that the reinforcing ribs 7 are radially arranged from the center of the lower portion of the plastic body 5.
  • the number of the reinforcing ribs 7 is twenty. root.
  • a plurality of heat dissipation holes 8 may be formed at the bottom end of the bowl-shaped plastic body. In this example, the number of the heat dissipation holes 8 is four.
  • Step 1 A tubular ferromagnetic yoke 4 is formed by using a seamless steel pipe.
  • Step 2 Prepare a shaft 3, preferably with a positioning notch 6 on the shaft 3.
  • the plastic body 5 wrapped around the outer portion of the tubular ferromagnetic crucible 4 and the inner wall of the tubular ferromagnetic yoke 4 may be injection molded by the following two methods; the plastic body 5 wrapped around the inner wall portion of the tubular ferromagnetic yoke 4, A plurality of notches uniformly distributed are formed; and, the plastic body 5 is formed in a bowl shape as a whole, and the lower portion thereof may have a tapered tubular shape or a non-conical tubular shape.
  • the shaft 3 is also placed in the plastic mold and disposed through the center of the tubular ferromagnetic yoke 4, and then the plastic body is placed.
  • the injection molding of 5 causes the plastic body 5 and the shaft 3 to be joined together as one piece during injection molding.
  • the plastic body 5 is injection molded, and the shaft 3 corresponding to the center of the tubular ferromagnetic yoke 4 is pressed into the plastic body 5. , the plastic body 5 and the shaft 3 are connected.
  • the injection molded plastic body 5 is specifically fixedly attached to the positioning notch 6 of the shaft 3, thereby preventing the rotation and axial movement of the plastic body 5 relative to the shaft 3.
  • a plurality of limiting slots corresponding to the number of notches, gP may be formed on the inner wall of the bowl-shaped plastic body 5, and the limiting slots are respectively formed on both side edges of each of the notches.
  • a plurality of reinforcing ribs 7 may be injection molded in the bowl-shaped plastic body 5 such that the reinforcing ribs 7 are radially arranged from the center of the lower portion of the plastic body 5.
  • the number of the reinforcing ribs 7 is twenty.
  • a plurality of heat dissipation holes 8 may be formed in the bottom end of the bowl-shaped plastic body. In this example, the number of the heat dissipation holes 8 is four. Step 4. Prepare a plurality of magnetic steels 2; four magnetic steels 2 are disposed in this embodiment.
  • Step 5 bonding the magnetic steel 2 to the plastic body 5 and the tubular ferromagnetic yoke 4 by glue or the like; specifically, inserting each magnetic steel 2 into a corresponding limiting groove on the plastic body 5, and at the corresponding notch The tubular ferromagnetic yoke 4 is bonded and fixed.
  • Steps 3 and 5 should be completed in the order described, that is, the plastic body 5 needs to be injection molded inside and outside the tubular body yoke 4 to ensure that the concentricity and roundness of the injection molding are consistent with the corresponding ones. After the technical requirements, the corresponding bonding of the magnetic steel 2 to the plastic body 5 and the tubular body yoke 4 is performed.
  • the outer rotor of the brushless motor of the present invention adopts a tubular ferromagnetic yoke 4, and no extension is required; the bowl-shaped plastic body 6 wrapped inside and outside the tubular ferromagnetic yoke 4 is molded by plastic molding, which can greatly improve no The concentricity and roundness of the outer rotor of the brush motor are beneficial to meet the technical requirements of dynamic balance.
  • the plastic body is first formed by injection molding, and the magnetic steel 2 is bonded, which can further ensure the production precision, and can reduce the cost loss caused by the scrapping of the material due to the failure of the injection molding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

L'invention concerne un rotor externe de moteur sans balai et son procédé de fabrication, lequel comprend une culasse ferromagnétique tubulaire. La paroi externe et une partie de la paroi interne de la culasse ferromagnétique tubulaire sont enveloppées par un corps plastique formé par moulage par injection. Plusieurs jours sont répartis sur le corps plastique enveloppé sur la paroi interne de la culasse ferromagnétique tubulaire, le bord de chaque jour comportant une gorge de limitation afin de limiter l'activité de l'aimant. Un arbre est disposé au centre de la culasse ferromagnétique tubulaire et est connecté en permanence au corps plastique. Plusieurs aimants sont disposés de façon correspondante dans les gorges de limitation sur le corps plastique, et sont fixés par adhésif à la culasse ferromagnétique tubulaire au niveau des jours. Selon la présente invention, la culasse ferromagnétique est tubulaire et ne doit pas être formée par extension. En outre, le corps plastique en forme de coupe enroulé sur l'intérieur et l'extérieur de la culasse ferromagnétique tubulaire est réalisé en utilisant une presse de moulage de plastique, ce qui réduit grandement la complexité de traitement et améliore la concentricité et le degré circulaire du rotor externe de moteur sans balai, améliorant ainsi efficacement les performances d'équilibre dynamique, assurant le taux de passe du rotor externe du moteur sans balai et augmentant l'efficacité de la production.
PCT/CN2011/001712 2011-03-09 2011-10-13 Rotor externe de moteur sans balai et son procédé de fabrication WO2012119284A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201120060647.5 2011-03-09
CN2011200606475U CN201966774U (zh) 2011-03-09 2011-03-09 一种无刷电机外转子

Publications (1)

Publication Number Publication Date
WO2012119284A1 true WO2012119284A1 (fr) 2012-09-13

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Application Number Title Priority Date Filing Date
PCT/CN2011/001712 WO2012119284A1 (fr) 2011-03-09 2011-10-13 Rotor externe de moteur sans balai et son procédé de fabrication

Country Status (2)

Country Link
CN (1) CN201966774U (fr)
WO (1) WO2012119284A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3258573A1 (fr) * 2016-06-15 2017-12-20 Johnson Electric S.A. Rotor, moteur et outil électrique les utilisant
CN114285201A (zh) * 2021-12-03 2022-04-05 浙江中力工具制造有限公司 一种无刷电机外转子结构及其表面处理方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201966774U (zh) * 2011-03-09 2011-09-07 上海航天汽车机电股份有限公司舒航电器分公司 一种无刷电机外转子
CN103779984A (zh) * 2012-10-23 2014-05-07 德昌电机(深圳)有限公司 电机
CN105322678A (zh) * 2014-08-01 2016-02-10 广东美芝制冷设备有限公司 压缩机及其驱动电机和驱动电机的加工方法
GB2608165B (en) * 2021-06-24 2024-04-24 Eta Green Power Ltd Rotor for an electric machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0678506A (ja) * 1992-08-25 1994-03-18 Aiwa Co Ltd ラジアル型アウターロータ方式ブラシレスモータ
CN200966013Y (zh) * 2006-10-17 2007-10-24 梁润雄 工业用风扇
CN201699562U (zh) * 2010-05-24 2011-01-05 上海航天汽车机电股份有限公司舒航电器分公司 一种无刷电机外转子
CN201966774U (zh) * 2011-03-09 2011-09-07 上海航天汽车机电股份有限公司舒航电器分公司 一种无刷电机外转子

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0678506A (ja) * 1992-08-25 1994-03-18 Aiwa Co Ltd ラジアル型アウターロータ方式ブラシレスモータ
CN200966013Y (zh) * 2006-10-17 2007-10-24 梁润雄 工业用风扇
CN201699562U (zh) * 2010-05-24 2011-01-05 上海航天汽车机电股份有限公司舒航电器分公司 一种无刷电机外转子
CN201966774U (zh) * 2011-03-09 2011-09-07 上海航天汽车机电股份有限公司舒航电器分公司 一种无刷电机外转子

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3258573A1 (fr) * 2016-06-15 2017-12-20 Johnson Electric S.A. Rotor, moteur et outil électrique les utilisant
US10673295B2 (en) 2016-06-15 2020-06-02 Johnson Electric International AG Rotor, motor and electric tool utilizing the same
CN114285201A (zh) * 2021-12-03 2022-04-05 浙江中力工具制造有限公司 一种无刷电机外转子结构及其表面处理方法
CN114285201B (zh) * 2021-12-03 2023-01-10 浙江中力工具制造有限公司 一种无刷电机外转子结构及其表面处理方法

Also Published As

Publication number Publication date
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