GB2111410A - Yoke assembly manufacturing method - Google Patents

Yoke assembly manufacturing method Download PDF

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Publication number
GB2111410A
GB2111410A GB08235286A GB8235286A GB2111410A GB 2111410 A GB2111410 A GB 2111410A GB 08235286 A GB08235286 A GB 08235286A GB 8235286 A GB8235286 A GB 8235286A GB 2111410 A GB2111410 A GB 2111410A
Authority
GB
United Kingdom
Prior art keywords
yoke
magnetic poles
yoke assembly
assembly
coated film
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB08235286A
Other versions
GB2111410B (en
Inventor
Isao Hamano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of GB2111410A publication Critical patent/GB2111410A/en
Application granted granted Critical
Publication of GB2111410B publication Critical patent/GB2111410B/en
Expired legal-status Critical Current

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Classifications

    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Dc Machiner (AREA)

Abstract

A method of manufacturing a yoke assembly is disclosed in which a yoke 2 is formed by drawing a soft steel plate and permanent magnet poles 3 are bonded to the yoke. The resulting assembly is then coated with a film 6 of coating material to protect the yoke from corrosion and prevent moisture from reaching the bonding adhesive 4. Machining is then carried out to form bearing fitting and fitting surfaces B,A. <IMAGE>

Description

SPECIFICATION Yoke assembly manufacturing method Background of the Invention This invention relates to an improved method of manufacturing a yoke assembly for use in a permanent magnet type DC motor or the like.
A conventional method of manufacturing a yoke assembly of this type will be described with reference to Fig. 1. In Fig. 1, reference numeral 1 designates a yoke assembly; and 2, the cylindrical yoke of the yoke assembly 1. The yoke 2 is formed as follows: After the surface of a soft steel plate which has been subjected to deep drawing is treated by color zinc plating, a fitting part A and a bearing member fitting part B, which are necessary for the field system, are formed by machining. Further in Fig. 1, reference numeral 3 designates magnetic poles made up of ferrite permanent magnets. The magnetic poles 3 are fixedly secured to predetermined portions of the inner wall of the yoke 2 with an adhesive 4, the yoke having been plated and machined as described above.
The conventional yoke assembly of the permanent magnetic type DC motor, manufactured as described above, and especially those in which the magnetic poles 3 made up of ferrite permanent magnets are bonded to the zincplated surface of the yoke 2 with epoxy resin adhesive, suffer from the following drawback: Water permeates into the porous interior of the ferrite permanent magnet, to reach the adhesive surface, and there causes a chemical reaction, whereby the adhesive strength between the yoke 2 and the magnetic poles 3 is extremely diminished.
Summary of the Invention Accordingly, an object of this invention is to provide a yoke assembly manufacturing method in which, after a film coating is formed over the entire surface of a primary product fabricated by bonding magnetic poles to a yoke, a fitting part and a bearing member fitting which are necessary for the yoke assembly are formed by machining, whereby the above-described drawback is eliminated. The manufactured yoke assembly has an excellent anticorrosion characteristic even though the yoke is not plated.
Brief Description of the Drawings Fig. 1 is a sectional side view of a yoke assembly fabricated according to a conventional manufacturing method; Figs. 2 and 3 are sectional side views showing steps of a method of manufacturing a yoke assembly according to one embodiment of this invention; and Fig. 4 is a sectional side view showing a yoke assembly fabricated according to the manufacturing method of the invention.
Detailed Description of the Preferred Embodiments One embodiment of this invention will now be described with reference to Figs. 2, 3 and 4. A cylindrical yoke 2 having the required configuration is fabricated by subjecting a soft steel plate to deep drawing. Magnetic poles 3 made up of ferrite permanent magnets are fixedly secured to predetermined portions of the inner wall of the yoke 2 with epoxy resin adhesive 4, to provide a partially completed yoke assembly 1 a (hereinafter referred to as "the primary product").
Next, a coated film 6 (cf. Fig. 4) is formed over the entire surface, including the inner and outer walls, of the primary products 1 a of Fig. 2 by spraying a coating solution 5 thereonto or by immersing the primary product 1 a in coating solution, as shown in Fig. 3. Thereafter, a fitting part A and a bearing member fitting B, which are necessary for the field system, are formed as shown in Fig. 4, whereby a complete yoke assembly 1 is obtained.
In the yoke assembly manufactured according to the method of this invention, the film 6 prevents water from reaching the adhesive between the yoke 2 and the magnetic poles 3, and accordingly prevents the difficulty of a decayed adhesive allowing the magnetic poles 3 to come off of the yoke 2. As substantially the entire yoke assembly is coated with the film 6, the yoke assembly is thus protected from corrosion.
In the above-described embodiment, magnetic poles made up of ferrite permanent magnets are bonded to a yoke formed of a soft steel plate.
However, according to the invention, the yoke and the magnetic poles may be made of other materials. Furthermore, in the above-described embodiment, the coated film 6 is formed by use of a coating solution; however, the coated film may be formed using painting materials such as coating powders, other than liquid-phase painting material.
As is clear from the above description, the yoke assembly according to the invention is formed according to a method in which a coating film is formed over the entire surface of a primary product produced by bonding magnetic poles of a yoke, and then a fitting part and a bearing member fitting are formed by machining. Therefore, it is unnecessary to plate the yoke, and the yoke assembly according to the invention has an excellent anticorrosion characteristic and can be manufactured at a relatively low cost.
1. A yoke assembly manufacturing method, comprising; bonding magnetic poles to the yoke, forming a coated film over the surface of the yoke, including said bonded magnetic poles, and machining a fitting part and a bearing member fitting necessary for said yoke assembly.
2. A method as claimed in claim 1 , wherein said
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Yoke assembly manufacturing method Background of the Invention This invention relates to an improved method of manufacturing a yoke assembly for use in a permanent magnet type DC motor or the like. A conventional method of manufacturing a yoke assembly of this type will be described with reference to Fig. 1. In Fig. 1, reference numeral 1 designates a yoke assembly; and 2, the cylindrical yoke of the yoke assembly 1. The yoke 2 is formed as follows: After the surface of a soft steel plate which has been subjected to deep drawing is treated by color zinc plating, a fitting part A and a bearing member fitting part B, which are necessary for the field system, are formed by machining. Further in Fig. 1, reference numeral 3 designates magnetic poles made up of ferrite permanent magnets. The magnetic poles 3 are fixedly secured to predetermined portions of the inner wall of the yoke 2 with an adhesive 4, the yoke having been plated and machined as described above. The conventional yoke assembly of the permanent magnetic type DC motor, manufactured as described above, and especially those in which the magnetic poles 3 made up of ferrite permanent magnets are bonded to the zincplated surface of the yoke 2 with epoxy resin adhesive, suffer from the following drawback: Water permeates into the porous interior of the ferrite permanent magnet, to reach the adhesive surface, and there causes a chemical reaction, whereby the adhesive strength between the yoke 2 and the magnetic poles 3 is extremely diminished. Summary of the Invention Accordingly, an object of this invention is to provide a yoke assembly manufacturing method in which, after a film coating is formed over the entire surface of a primary product fabricated by bonding magnetic poles to a yoke, a fitting part and a bearing member fitting which are necessary for the yoke assembly are formed by machining, whereby the above-described drawback is eliminated. The manufactured yoke assembly has an excellent anticorrosion characteristic even though the yoke is not plated. Brief Description of the Drawings Fig. 1 is a sectional side view of a yoke assembly fabricated according to a conventional manufacturing method; Figs. 2 and 3 are sectional side views showing steps of a method of manufacturing a yoke assembly according to one embodiment of this invention; and Fig. 4 is a sectional side view showing a yoke assembly fabricated according to the manufacturing method of the invention. Detailed Description of the Preferred Embodiments One embodiment of this invention will now be described with reference to Figs. 2, 3 and 4. A cylindrical yoke 2 having the required configuration is fabricated by subjecting a soft steel plate to deep drawing. Magnetic poles 3 made up of ferrite permanent magnets are fixedly secured to predetermined portions of the inner wall of the yoke 2 with epoxy resin adhesive 4, to provide a partially completed yoke assembly 1 a (hereinafter referred to as "the primary product"). Next, a coated film 6 (cf. Fig. 4) is formed over the entire surface, including the inner and outer walls, of the primary products 1 a of Fig. 2 by spraying a coating solution 5 thereonto or by immersing the primary product 1 a in coating solution, as shown in Fig. 3. Thereafter, a fitting part A and a bearing member fitting B, which are necessary for the field system, are formed as shown in Fig. 4, whereby a complete yoke assembly 1 is obtained. In the yoke assembly manufactured according to the method of this invention, the film 6 prevents water from reaching the adhesive between the yoke 2 and the magnetic poles 3, and accordingly prevents the difficulty of a decayed adhesive allowing the magnetic poles 3 to come off of the yoke 2. As substantially the entire yoke assembly is coated with the film 6, the yoke assembly is thus protected from corrosion. In the above-described embodiment, magnetic poles made up of ferrite permanent magnets are bonded to a yoke formed of a soft steel plate. However, according to the invention, the yoke and the magnetic poles may be made of other materials. Furthermore, in the above-described embodiment, the coated film 6 is formed by use of a coating solution; however, the coated film may be formed using painting materials such as coating powders, other than liquid-phase painting material. As is clear from the above description, the yoke assembly according to the invention is formed according to a method in which a coating film is formed over the entire surface of a primary product produced by bonding magnetic poles of a yoke, and then a fitting part and a bearing member fitting are formed by machining. Therefore, it is unnecessary to plate the yoke, and the yoke assembly according to the invention has an excellent anticorrosion characteristic and can be manufactured at a relatively low cost. CLAIMS
1. A yoke assembly manufacturing method, comprising; bonding magnetic poles to the yoke, forming a coated film over the surface of the yoke, including said bonded magnetic poles, and machining a fitting part and a bearing member fitting necessary for said yoke assembly.
2. A method as claimed in claim 1 , wherein said magnetic poles are adhesively bonded to said yoke, and said coated film prevents moisture from reachina the adhesive.
3. A method as claimed in claim 1 , wherein said coated film is formed over the entire surface of said yoke by spraying.
4. A method as claimed in claim 1, wherien said coated film is formed over the entire surface of said yoke by dipping.
5. A method as claimed in claim 1, wherein said yoke is formed by deep drawing a soft steel plate, and said coated film is applied directly to said yoke, said coated film forming an anti-corrosive layer over said yoke.
6. Amethod as claimed in claim 1, wherein said machining operation removes said coated film only from surfaces substantially spaced from said magnetic poles.
GB08235286A 1981-12-10 1982-12-10 Yoke assembly manufacturing method Expired GB2111410B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19963481A JPS58103863A (en) 1981-12-10 1981-12-10 Manufacture of field unit

Publications (2)

Publication Number Publication Date
GB2111410A true GB2111410A (en) 1983-07-06
GB2111410B GB2111410B (en) 1985-05-22

Family

ID=16411105

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08235286A Expired GB2111410B (en) 1981-12-10 1982-12-10 Yoke assembly manufacturing method

Country Status (3)

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JP (1) JPS58103863A (en)
FR (1) FR2518327B1 (en)
GB (1) GB2111410B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206742A (en) * 1987-07-08 1989-01-11 Johnson Electric Ind Mfg A permanent magnet electric motor having keeper ring
EP1220420A1 (en) * 2000-12-28 2002-07-03 Valeo Equipements Electriques Moteur Manufacturing method of an exciter of an electric machine
GB2381390A (en) * 2001-09-26 2003-04-30 Visteon Global Tech Inc Pumping motor with skewed rotor laminations
US7211917B2 (en) * 2004-12-17 2007-05-01 Nidec Sankyo Corporation Motor with a magnet fixed on the inner peripheral face of a circumferential wall
WO2009127989A1 (en) * 2008-04-15 2009-10-22 Nxp B.V. Magnet system and method of manufacturing the same
CN112413023A (en) * 2020-11-20 2021-02-26 贵州新安航空机械有限责任公司 Processing method of sheet powder metallurgy brake disc

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769624A (en) * 1986-10-30 1988-09-06 General Motors Corporation Permanent magnet assembly
FR2617344B1 (en) * 1987-06-23 1993-05-21 Valeo ELECTRIC ROTATING MACHINE STATOR WITH PERMANENT MAGNETS
US4935080A (en) * 1988-01-29 1990-06-19 Kollmorgen Corporation Protection and bonding of neodymium-boron-iron magnets used in the formation of magnet assemblies
DE3923974A1 (en) * 1989-07-20 1991-01-31 Swf Auto Electric Gmbh METHOD FOR PRODUCING AN ELECTRIC MOTOR
JP4241209B2 (en) * 2003-05-15 2009-03-18 愛知製鋼株式会社 Motor device and method for manufacturing casing thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646374A (en) * 1970-03-20 1972-02-29 Schenectady Chemical Thermosetting polyester and polyester-imide resin for electrical insulation
US3789250A (en) * 1972-02-04 1974-01-29 Ford Motor Co Permanent magnet dynamoelectric machine
DE2505937A1 (en) * 1975-02-13 1976-08-19 Huebner Johannes Magnet bedding arrangement in electric machine housing - immovably held in exactly predefined position by embedding in synthetic resin
CH621916B (en) * 1979-02-27 Ebauchesfabrik Eta Ag METHOD OF MANUFACTURING STATORS FOR STEP MOTORS OF ELECTRONIC WATCHES, AND MOTOR REALIZED ACCORDING TO THE PROCESS.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2206742A (en) * 1987-07-08 1989-01-11 Johnson Electric Ind Mfg A permanent magnet electric motor having keeper ring
EP1220420A1 (en) * 2000-12-28 2002-07-03 Valeo Equipements Electriques Moteur Manufacturing method of an exciter of an electric machine
FR2819120A1 (en) * 2000-12-28 2002-07-05 Valeo Equip Electr Moteur METHOD FOR MANUFACTURING AN INDUCTOR OF A ROTATING ELECTRIC MACHINE
GB2381390A (en) * 2001-09-26 2003-04-30 Visteon Global Tech Inc Pumping motor with skewed rotor laminations
US7211917B2 (en) * 2004-12-17 2007-05-01 Nidec Sankyo Corporation Motor with a magnet fixed on the inner peripheral face of a circumferential wall
WO2009127989A1 (en) * 2008-04-15 2009-10-22 Nxp B.V. Magnet system and method of manufacturing the same
CN112413023A (en) * 2020-11-20 2021-02-26 贵州新安航空机械有限责任公司 Processing method of sheet powder metallurgy brake disc
CN112413023B (en) * 2020-11-20 2022-11-08 贵州新安航空机械有限责任公司 Processing method of thin sheet powder metallurgy brake disc

Also Published As

Publication number Publication date
JPS58103863A (en) 1983-06-21
FR2518327B1 (en) 1986-05-02
GB2111410B (en) 1985-05-22
FR2518327A1 (en) 1983-06-17

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20011210