GB2159342A - A rotor for an electrical machine - Google Patents

A rotor for an electrical machine Download PDF

Info

Publication number
GB2159342A
GB2159342A GB08512724A GB8512724A GB2159342A GB 2159342 A GB2159342 A GB 2159342A GB 08512724 A GB08512724 A GB 08512724A GB 8512724 A GB8512724 A GB 8512724A GB 2159342 A GB2159342 A GB 2159342A
Authority
GB
United Kingdom
Prior art keywords
rotor
cotters
shaft
pole terminals
terminals
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
GB08512724A
Other versions
GB2159342B (en
GB8512724D0 (en
Inventor
Entcho Nikolov Popov
Rumen Konstantinov Apostolov
Georgi Atanassov Georgiev
Ivan Georgiev Batchvarov
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.)
DSO ELPROM
Original Assignee
DSO ELPROM
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 DSO ELPROM filed Critical DSO ELPROM
Publication of GB8512724D0 publication Critical patent/GB8512724D0/en
Publication of GB2159342A publication Critical patent/GB2159342A/en
Application granted granted Critical
Publication of GB2159342B publication Critical patent/GB2159342B/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
    • H02K1/22—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
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Hinges (AREA)

Abstract

A rotor for an electrical machine comprises a shaft (4) and radially oriented permanent magnets arranged between pole terminals (1) with grooves in those faces of the pole terminals contacting the magnets, into which grooves cotters (2) have been driven, the cotters being longer than the pole terminals. Like ends of the cotters are connected with one another and with the shaft by means of a non-magnetic connecting element (3). This construction makes it possible to increase the radial dimensions of the magnets, thus increasing the effective magnetic flux and reducing the dissipation of magnetic flux through the machine shaft. <IMAGE>

Description

SPECIFICATION A rotor for an electrical machine The present invention relates to a rotor for an electrical machine.
It is known to provide a rotor with tangentially oriented permanent magnets and pole terminals placed between them. The inside ends of the pole terminals each have the shape of a "swallow tail" and are fastened by means of a non-magnetic sleeve formed by founding. The outer ends of the pole terminals have small rims under which are placed clamps tightened to the pole terminals.
The disadvantage of the known construction is that the "swallow tail" shapes and like forms at the inside ends of the pole terminals, together with the rims on their outer ends, reduce the radial dimensions of the magnets, which fact reduces the effective magnetic flux in the machine. In the above construction there is also a dissipation of magnetix flux through the "swallow tail" and the machine shaft.
According to the present invention there is provided a rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters being longer than the terminals and like ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element.
According to the present invention from another aspect, there is provided a rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters projecting from the pole terminals at a longitudinal end of the latter, the projecting ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element.
An advantage which may be achieved by a rotor according to the present invention is that the radial dimensions of the magnets may be increased, thus increasing the effective magnetic flux in the machine. The inside ends of the pole terminals can be designed with such a shape as to ensure minimum dissipation of magnetic flux through the machine shaft.
The present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a cross-section through the rotor of an electrical machine, and Figure 2 is a longitudinal section through the rotor.
Referring to Fig. 1 cotters 2 (in particular, wedges) are driven into grooves in pole terminals 1, the cotters being longer than the pole terminals. Non-magnetic elements 3 mechanically connect the ends of the cotters 2 with the shaft 4 of the machinesee Fig. 2.
Due to the fact that in the rotor (which also includes tangentially oriented permanent magnets between the terminals) there are cotters driven into grooves in two or more longitudinal surfaces of the terminals, the cotters being longer than the terminals, the ends of these cotters being mechanically connected with one another and with the shaft by means of a non-magnetic material, the radial dimension of each of the magnets is increased. This increases the effective magnetic flux and improves the performance characteristics of the machine.
The above construction also ensures a reduction of the dissipation of magnetic flux through the machine shaft, which increases the effectiveness of the magnets.
1. A rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters being longer than the terminals and like ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element.
2. A rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters projecting from the pole terminals at a longitudinal end of the latter, the projecting ends of the cotters being connected with each other and with said shaft by means of a nonmagnetic connecting element.
3. A rotor for an electrical machine, substantially as hereinbefore described with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A rotor for an electrical machine The present invention relates to a rotor for an electrical machine. It is known to provide a rotor with tangentially oriented permanent magnets and pole terminals placed between them. The inside ends of the pole terminals each have the shape of a "swallow tail" and are fastened by means of a non-magnetic sleeve formed by founding. The outer ends of the pole terminals have small rims under which are placed clamps tightened to the pole terminals. The disadvantage of the known construction is that the "swallow tail" shapes and like forms at the inside ends of the pole terminals, together with the rims on their outer ends, reduce the radial dimensions of the magnets, which fact reduces the effective magnetic flux in the machine. In the above construction there is also a dissipation of magnetix flux through the "swallow tail" and the machine shaft. According to the present invention there is provided a rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters being longer than the terminals and like ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element. According to the present invention from another aspect, there is provided a rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters projecting from the pole terminals at a longitudinal end of the latter, the projecting ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element. An advantage which may be achieved by a rotor according to the present invention is that the radial dimensions of the magnets may be increased, thus increasing the effective magnetic flux in the machine. The inside ends of the pole terminals can be designed with such a shape as to ensure minimum dissipation of magnetic flux through the machine shaft. The present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a cross-section through the rotor of an electrical machine, and Figure 2 is a longitudinal section through the rotor. Referring to Fig. 1 cotters 2 (in particular, wedges) are driven into grooves in pole terminals 1, the cotters being longer than the pole terminals. Non-magnetic elements 3 mechanically connect the ends of the cotters 2 with the shaft 4 of the machinesee Fig. 2. Due to the fact that in the rotor (which also includes tangentially oriented permanent magnets between the terminals) there are cotters driven into grooves in two or more longitudinal surfaces of the terminals, the cotters being longer than the terminals, the ends of these cotters being mechanically connected with one another and with the shaft by means of a non-magnetic material, the radial dimension of each of the magnets is increased. This increases the effective magnetic flux and improves the performance characteristics of the machine. The above construction also ensures a reduction of the dissipation of magnetic flux through the machine shaft, which increases the effectiveness of the magnets. CLAIMS
1. A rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters being longer than the terminals and like ends of the cotters being connected with each other and with said shaft by means of a non-magnetic connecting element.
2. A rotor for an electrical machine, the rotor comprising a shaft and tangentially oriented permanent magnets arranged between pole terminals, in which rotor there are grooves in those surfaces of the pole terminals contacting the permanent magnets, in which grooves cotters are received, the cotters projecting from the pole terminals at a longitudinal end of the latter, the projecting ends of the cotters being connected with each other and with said shaft by means of a nonmagnetic connecting element.
3. A rotor for an electrical machine, substantially as hereinbefore described with reference to the accompanying drawings.
GB08512724A 1984-05-22 1985-05-20 A rotor for an electrical machine Expired GB2159342B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BG6557984A BG39785A1 (en) 1984-05-22 1984-05-22 Rotor for electric machine

Publications (3)

Publication Number Publication Date
GB8512724D0 GB8512724D0 (en) 1985-06-26
GB2159342A true GB2159342A (en) 1985-11-27
GB2159342B GB2159342B (en) 1987-11-11

Family

ID=3913895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08512724A Expired GB2159342B (en) 1984-05-22 1985-05-20 A rotor for an electrical machine

Country Status (7)

Country Link
JP (1) JPS60261345A (en)
BG (1) BG39785A1 (en)
CS (1) CS260042B1 (en)
DD (1) DD259553A3 (en)
DE (1) DE3517883A1 (en)
GB (1) GB2159342B (en)
RO (1) RO95615B (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999010962A1 (en) * 1997-08-27 1999-03-04 Magnet-Motor Gesellschaft Für Magnetmotorische Technik Mbh Electric machine with a rotor constructed of permanent magnets and magnetic flux guides
US7332837B2 (en) 2003-08-11 2008-02-19 General Motors Corporation Cooling and handling of reaction torque for an axial flux motor
US7592766B2 (en) 2003-08-11 2009-09-22 Gm Global Technology Operations, Inc. Gearless wheel motor drive system
US8129880B2 (en) 2007-11-15 2012-03-06 GM Global Technology Operations LLC Concentrated winding machine with magnetic slot wedges
US20140103769A1 (en) * 2012-10-15 2014-04-17 Rbc Manufacturing Corporation Radially embedded permanent magnet rotor and methods thereof
US20140103771A1 (en) * 2012-10-15 2014-04-17 Rbc Manufacturing Corporation Radially embedded permanent magnet rotor and methods thereof
EP2793365A1 (en) * 2013-04-16 2014-10-22 Siemens Aktiengesellschaft Single segment rotor with single segments held by girders and method of manufacturing
US9831727B2 (en) 2012-10-15 2017-11-28 Regal Beloit America, Inc. Permanent magnet rotor and methods thereof
US9923423B2 (en) 2012-10-15 2018-03-20 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
US11527931B2 (en) * 2017-09-24 2022-12-13 Genesis Robotics And Motion Technologies Canada, Ulc Radial multi piece rotor for electric machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10100718A1 (en) * 2001-01-10 2002-07-18 Miele & Cie Permanent magnet rotor with reduced eddy current loss has holding elements in form of bolts joined only to cover plates and ending before cover plates on opposite side from joint
DE10100717C1 (en) * 2001-01-10 2002-07-25 Miele & Cie Permanent magnet rotor with reduced eddy current loss has holding elements in form of bolts joined only to cover plates and ending before cover plates on opposite side from joint

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BG24523A1 (en) * 1977-05-11 1978-03-10 Stanilov Rotor with permanent magnets for electical machine
DD133879B1 (en) * 1977-11-08 1980-08-27 Eckehard Bunzel PERMANENT ROLLED ELECTRIC MACHINE
BG29845A1 (en) * 1978-02-24 1981-02-16 Popov Rotating inductor of electric machine
US4327302A (en) * 1979-09-21 1982-04-27 General Electric Company Electronically commutated motor, stationary and rotatable assemblies therefore, and lamination
GB2075274A (en) * 1980-05-02 1981-11-11 Inst Elektropromishlenost Permanent-magnet rotors for electrical machines
US4393320A (en) * 1981-09-02 1983-07-12 Carrier Corporation Permanent magnet rotor
FR2519483A1 (en) * 1981-12-31 1983-07-08 Auxilec High speed sync. avoiding alternator - uses permanent magnets between magnetic sheets with axially directed support bars and radial bars linking outer ring to hub
US4482831A (en) * 1982-04-05 1984-11-13 Notaras John Arthur Magneto arrangement
DD220182A1 (en) * 1983-10-03 1985-03-20 Elektromasch Forsch Entw PERMANENT MAGNETIC ROLLER FOR ELECTRICAL MACHINES

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999010962A1 (en) * 1997-08-27 1999-03-04 Magnet-Motor Gesellschaft Für Magnetmotorische Technik Mbh Electric machine with a rotor constructed of permanent magnets and magnetic flux guides
US7332837B2 (en) 2003-08-11 2008-02-19 General Motors Corporation Cooling and handling of reaction torque for an axial flux motor
US7592766B2 (en) 2003-08-11 2009-09-22 Gm Global Technology Operations, Inc. Gearless wheel motor drive system
US8129880B2 (en) 2007-11-15 2012-03-06 GM Global Technology Operations LLC Concentrated winding machine with magnetic slot wedges
US9923423B2 (en) 2012-10-15 2018-03-20 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
US10608488B2 (en) 2012-10-15 2020-03-31 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
US11277045B2 (en) 2012-10-15 2022-03-15 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
US20140103771A1 (en) * 2012-10-15 2014-04-17 Rbc Manufacturing Corporation Radially embedded permanent magnet rotor and methods thereof
US20140103769A1 (en) * 2012-10-15 2014-04-17 Rbc Manufacturing Corporation Radially embedded permanent magnet rotor and methods thereof
US9362792B2 (en) * 2012-10-15 2016-06-07 Regal Beloit America, Inc. Radially embedded permanent magnet rotor having magnet retention features and methods thereof
US9831727B2 (en) 2012-10-15 2017-11-28 Regal Beloit America, Inc. Permanent magnet rotor and methods thereof
US9882440B2 (en) 2012-10-15 2018-01-30 Regal Beloit America, Inc. Radially embedded permanent magnet rotor and methods thereof
CN105122596A (en) * 2013-04-16 2015-12-02 西门子公司 Individual-segment rotor having individual segments retained by flexural supports
US9935508B2 (en) 2013-04-16 2018-04-03 Siemens Aktiengesellschaft Individual-segment rotor having individual segments retained by flexural supports and production method
WO2014169972A1 (en) * 2013-04-16 2014-10-23 Siemens Aktiengesellschaft Individual-segment rotor having individual segments retained by flexural supports
EP2793365A1 (en) * 2013-04-16 2014-10-22 Siemens Aktiengesellschaft Single segment rotor with single segments held by girders and method of manufacturing
US11527931B2 (en) * 2017-09-24 2022-12-13 Genesis Robotics And Motion Technologies Canada, Ulc Radial multi piece rotor for electric machine
US11791682B2 (en) 2017-09-24 2023-10-17 Genesis Motion Solutions Ulc Radial multi piece rotor for electric machine

Also Published As

Publication number Publication date
GB2159342B (en) 1987-11-11
RO95615B (en) 1988-10-01
DD259553A3 (en) 1988-08-31
JPS60261345A (en) 1985-12-24
CS339185A1 (en) 1988-02-15
DE3517883A1 (en) 1985-11-28
BG39785A1 (en) 1986-08-15
CS260042B1 (en) 1988-11-15
RO95615A (en) 1988-09-30
GB8512724D0 (en) 1985-06-26

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee