WO2001080400B1 - Permanent magnet stator assembly and method of manufacturing - Google Patents

Permanent magnet stator assembly and method of manufacturing

Info

Publication number
WO2001080400B1
WO2001080400B1 PCT/IB2001/000724 IB0100724W WO0180400B1 WO 2001080400 B1 WO2001080400 B1 WO 2001080400B1 IB 0100724 W IB0100724 W IB 0100724W WO 0180400 B1 WO0180400 B1 WO 0180400B1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
stator
housing
magnet
further characterised
Prior art date
Application number
PCT/IB2001/000724
Other languages
French (fr)
Other versions
WO2001080400A2 (en
WO2001080400A3 (en
Inventor
Jennifer M Ambrose
Jonathan D King
Randolph W Callihan
Original Assignee
Crumax Magnetics Inc
Jennifer M Ambrose
Jonathan D King
Randolph W Callihan
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 Crumax Magnetics Inc, Jennifer M Ambrose, Jonathan D King, Randolph W Callihan filed Critical Crumax Magnetics Inc
Priority to AU2001250577A priority Critical patent/AU2001250577A1/en
Publication of WO2001080400A2 publication Critical patent/WO2001080400A2/en
Publication of WO2001080400A3 publication Critical patent/WO2001080400A3/en
Publication of WO2001080400B1 publication Critical patent/WO2001080400B1/en

Links

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

Abstract

A motor stator (12) having increased flux-carrying capacity and a method of increasing the flux-carrying capacity is described; a sleeve (14) of ferro-magnetic material is first inserted into housing (12) of ferro-magnetic material, thereby increasing the thickness, and consequently the flux-carrying capacity, of the housing, a mixture of plastic and magnet powder is then injection moulded into the housing/sleeve and passes through perforations (30) located in the sleeve to adhere to both the sleeve and the housing and form arcuate magnet segments (16, 18); resulting in stronger adhesion between the magnets and the housing/sleeve and increased flux-carrying capacity of the steel behind the magnets.

Claims

9AMENDED CLAIMS[received by the International Bureau on 7 February 2002 (07.02.02); original claims 1-16 replaced by amended claims 1-13 (2 pages)]
1. A stator comprising: a. a housing (12) of ferro- magnetic material; b. at least one magnet (16,18) located within the housing; c. a sleeve (14) is nested between the housing (12) and the magnet (16,18) characterised in that d. the sleeve is a band (14) of ferro-magnetic material having perforations (30); and, e. the at least one magnet (16,18) is a moulding extending through the sleeve perforations (30).
2. A stator as claimed in claim 1 and further characterised in that the sleeve (14) is fixed to the housing (12).
3. A stator as claimed in claim 1 or claim 2 and further characterised in that the housing (12) is steel.
4. A stator as claimed in any of claims 1 to 3 and further characterised in that the sleeve (14) has a protrusion (20) located in a hole (22) in the housing (12).
5. A stator as claimed in any of claims 1 to 4 and further characterised in that the axial heights of the magnet (16,18) and the sleeve (14) are approximately equal.
6. A stator as claimed in any of claims 1 to 5 and further characterised in that two magnets (16,18) are fixed within opposing sides the sleeve (14).
7. A stator as claimed in any of claims 1 to 6 and further characterised in that the magnet longitudinal edges (24,25,26,27) comprise a more coercive material than the centre portions (28,29) thereof. 10
8. A stator as claimed in claim 7 and further characterised in that the magnet centres portions (28,29) comprise a non-magnetic material.
9. A stator as claimed in claim 8 and further characterised in that the nonmagnetic material comprises plastic.
10. A stator as claimed in any of claims 1 to 9 and further characterised in that plastic spacers are located between opposed edges (24,25,26,27) of opposing magnets (16,18).
11. A stator as claimed in any of claims 1 to 10 and further characterised in that magnet material extends through the sleeve perforations (30) to adhere to the housing (12).
12. A method of manufacturing a stator comprising the steps of:- a. locating at least one magnet (16,18) within a housing (12) of ferromagnetic material; b. nesting a sleeve (14) between the housing and the at least one magnet; characterised:- c. in that the sleeve (14) is a band of ferro-magnetic material having perforations (30); and, d) by the step of moulding the at least one magnet (16,18) to extend through the sleeve perforations.
13. The method of claim 11 and further characterised by the step of moulding a mixture comprising plastic powder and magnetic powder within the sleeve
PCT/IB2001/000724 2000-04-19 2001-04-18 Permanent magnet stator assembly and method of manufacturing WO2001080400A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001250577A AU2001250577A1 (en) 2000-04-19 2001-04-18 Permanent magnet stator assembly and method of manufacturing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55237600A 2000-04-19 2000-04-19
US09/552,376 2000-04-19

Publications (3)

Publication Number Publication Date
WO2001080400A2 WO2001080400A2 (en) 2001-10-25
WO2001080400A3 WO2001080400A3 (en) 2002-03-28
WO2001080400B1 true WO2001080400B1 (en) 2002-07-04

Family

ID=24205061

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/000724 WO2001080400A2 (en) 2000-04-19 2001-04-18 Permanent magnet stator assembly and method of manufacturing

Country Status (2)

Country Link
AU (1) AU2001250577A1 (en)
WO (1) WO2001080400A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6903475B2 (en) * 2001-02-23 2005-06-07 Black & Decker Inc. Stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
EP1588469A4 (en) * 2002-12-13 2014-04-30 Black & Decker Inc A stator assembly with an overmolding that secures magnets to a flux ring and the flux ring to a stator housing
WO2007061214A2 (en) * 2005-11-23 2007-05-31 Daewoo Electronics Corporation Motor having stator made of soft magnetic powder material

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2527461C2 (en) * 1975-06-20 1987-01-02 Robert Bosch Gmbh, 7000 Stuttgart Process for the production of anisotropic segment magnets for electrical machines
JPS5765262A (en) * 1980-10-08 1982-04-20 Hitachi Ltd Dc machine
FR2617345B1 (en) * 1987-06-23 1993-04-02 Valeo ELECTRIC ROTATING MACHINE STATOR WITH PERMANENT MAGNETS, AND INDUCER POLE FOR THIS STATOR
US5206556A (en) * 1989-08-29 1993-04-27 Mabuchi Motor Co., Ltd. Field magnet for miniature motors
JPH04248340A (en) * 1991-01-24 1992-09-03 Matsushita Electric Ind Co Ltd Magnet motor
US5268607A (en) * 1992-09-09 1993-12-07 Webster Plastics Molded resin motor housing
JPH0946939A (en) * 1995-07-26 1997-02-14 Daido Steel Co Ltd Case fitted with magnet and its manufacture
DE19808550C1 (en) * 1998-02-28 1999-07-29 Bosch Gmbh Robert Electric motor, esp. a permanent magnet stimulated electric motor

Also Published As

Publication number Publication date
WO2001080400A2 (en) 2001-10-25
WO2001080400A3 (en) 2002-03-28
AU2001250577A1 (en) 2001-10-30

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