GB2346266A - Motor with encapsulated stator - Google Patents

Motor with encapsulated stator Download PDF

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Publication number
GB2346266A
GB2346266A GB9821797A GB9821797A GB2346266A GB 2346266 A GB2346266 A GB 2346266A GB 9821797 A GB9821797 A GB 9821797A GB 9821797 A GB9821797 A GB 9821797A GB 2346266 A GB2346266 A GB 2346266A
Authority
GB
United Kingdom
Prior art keywords
axial airgap
motor
insulating material
airgap motor
moulding compound
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.)
Withdrawn
Application number
GB9821797A
Other versions
GB9821797D0 (en
Inventor
Stephen Paul Hurley
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.)
ELECTRODRIVES Ltd
Original Assignee
ELECTRODRIVES Ltd
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 ELECTRODRIVES Ltd filed Critical ELECTRODRIVES Ltd
Priority to GB9821797A priority Critical patent/GB2346266A/en
Publication of GB9821797D0 publication Critical patent/GB9821797D0/en
Publication of GB2346266A publication Critical patent/GB2346266A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08—Insulating casings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
    • H02K5/225—Terminal boxes or connection arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

An axial airgap motor comprises a stator encapsulated within a hardenable electrically insulating material 3. The connector block 6 is partially embedded and the coil winding is directly connected to the block within the moulding compound which may be a glass polyester dough moulding compound.

Description

MOTOR Disclosed herein are improvements in and relating to motors and more particularly so-called axial airgap (AAG) motors. Also known as"axial flux motors".
It is an object of the present invention to provide a less expensive construction which provides enhanced weatherproofing of the motor.
In accordance with the invention an axial airgap motor has a stator encapsulated by or encased within a hardenable electrically insulating material.
The hardenable material is preferably a glass reinforced polyester dough moulding compound. As well as a requirement to provide electrical insulation (secondary to the usual insulation of the winding wires), the selection of a suitable insulating material can take account of thermal energy transfer requirements, for example to provide a heat conduction path better than that afforded by an airgap.
One embodiment of the invention is shown by way of example only in the attached drawing which shows a longitudinal cross-section of a moulded axial airgap motor.
The disc shaped stator of the axial airgap motor 1 and its winding 2 are encapsulated by or encased within a structure formed by glass reinforced polyester dough moulding compound 3. Such a structure may be formed by a suitable moulding process.
The shaft 4 on to which the rotor 5 will be fitted is moulded into position.
The rotor 5 is finished by a machining process and similarly the moulded stator assembly is machined to ensure that in the resulting assembled motor 1 the axial airgap 7 has parallel sides. The width of the airgap 7 is set during assembly of the motor.
The electrical connections for the motor have to exit the moulding, and one way of doing this is, as shown in the drawings, by use of a special purpose connecting device 6 which is embedded part above and part below the surface of the moulding 3. Thus the wound stator plus the connecting block and shaft preform are inserts to the moulding process and the complete moulding assembly is the"output"which then goes on to subsequent machining and assembly operations.
The provision of the stator structure by moulding in dough moulding compound is overall a less expensive method of manufacture than achieving the same by metal components which typically require casting, fettling, machining, surface treatment and/or assembly. The introduction of the special purpose connecting block with wires from the winding coils connecting directly to it beneath the surface of the dough moulding compound eliminates the need for inter-connecting leads and simplifies the connecting process which is one of the most labour intensive stages of motor manufacture at the present time.
The dough moulding compound structure provides the isolation from conducting parts and protection from ingress normally afforded by a metal enclosure, but to a greater extent. Thus a lower cost of manufacture and enhanced weatherproofing is achieved.

Claims (6)

  1. CLAIMS : 1 An axial airgap motor comprising a stator encapsulated by or encased within a hardenable electrically insulating material.
  2. 2 An axial airgap motor according to Claim 1 wherein the hardenable material is a polyester dough moulding compound.
  3. 3 An axial airgap motor according to Claim 2 wherein the hardenable material is glass reinforced.
  4. 4 An axial airgap motor according to any one of the preceding claims comprising a shaft on which a rotor may be fitted and moulded into the insulating material.
  5. 5 An axial airgap motor according to any one of the preceding claims comprising a connecting device partly embedded within the insulating material and through which electrical connections pass.
  6. 6 An axial airgap motor substantially as described herein with reference to, and as illustrated in, the accompanying drawing.
GB9821797A 1998-10-07 1998-10-07 Motor with encapsulated stator Withdrawn GB2346266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9821797A GB2346266A (en) 1998-10-07 1998-10-07 Motor with encapsulated stator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9821797A GB2346266A (en) 1998-10-07 1998-10-07 Motor with encapsulated stator

Publications (2)

Publication Number Publication Date
GB9821797D0 GB9821797D0 (en) 1998-12-02
GB2346266A true GB2346266A (en) 2000-08-02

Family

ID=10840110

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9821797A Withdrawn GB2346266A (en) 1998-10-07 1998-10-07 Motor with encapsulated stator

Country Status (1)

Country Link
GB (1) GB2346266A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6659737B2 (en) * 2001-02-05 2003-12-09 Engineered Machined Products, Inc. Electronic fluid pump with an encapsulated stator assembly
US6743001B2 (en) * 2001-07-31 2004-06-01 Denso Corporation Fuel pump having rotatably supported pipe member between bearing members and fixed center shaft
US6774530B2 (en) 2002-06-07 2004-08-10 Briggs & Stratton Corporation Winding assemblies for electrical machines

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387311A (en) * 1977-09-09 1983-06-07 Hitachi, Ltd. Uninflammable dynamoelectric machine having coil windings and core encapsulated with unsaturated polyester resin-filler composition
US4568862A (en) * 1983-04-15 1986-02-04 Mavilor Systemes, S.A. Commutatorless d.c. motor with electronic commutation
FR2593432A2 (en) * 1986-01-30 1987-07-31 Jacobiac Claude Process for imperviously encapsulating the stator of an electric motor and electric motor obtained using this method
WO1996031936A1 (en) * 1995-04-03 1996-10-10 E.I. Du Pont De Nemours And Company Injection molded motor assembly and method of fabrication
US5672927A (en) * 1995-06-15 1997-09-30 Quantum Corporation Motor with overmold coil support
EP0807644A1 (en) * 1995-11-30 1997-11-19 Matsushita Electric Industrial Co., Ltd. Molding material and molded motor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387311A (en) * 1977-09-09 1983-06-07 Hitachi, Ltd. Uninflammable dynamoelectric machine having coil windings and core encapsulated with unsaturated polyester resin-filler composition
US4568862A (en) * 1983-04-15 1986-02-04 Mavilor Systemes, S.A. Commutatorless d.c. motor with electronic commutation
FR2593432A2 (en) * 1986-01-30 1987-07-31 Jacobiac Claude Process for imperviously encapsulating the stator of an electric motor and electric motor obtained using this method
WO1996031936A1 (en) * 1995-04-03 1996-10-10 E.I. Du Pont De Nemours And Company Injection molded motor assembly and method of fabrication
US5672927A (en) * 1995-06-15 1997-09-30 Quantum Corporation Motor with overmold coil support
EP0807644A1 (en) * 1995-11-30 1997-11-19 Matsushita Electric Industrial Co., Ltd. Molding material and molded motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPI Abstract & FR002593432A (Jacobiac) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6659737B2 (en) * 2001-02-05 2003-12-09 Engineered Machined Products, Inc. Electronic fluid pump with an encapsulated stator assembly
GB2397442B (en) * 2001-02-05 2005-09-21 Engineered Machined Products I Electronic fluid pump with encapsulated stator assembly
US6743001B2 (en) * 2001-07-31 2004-06-01 Denso Corporation Fuel pump having rotatably supported pipe member between bearing members and fixed center shaft
US6774530B2 (en) 2002-06-07 2004-08-10 Briggs & Stratton Corporation Winding assemblies for electrical machines

Also Published As

Publication number Publication date
GB9821797D0 (en) 1998-12-02

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)