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(11)    Patent No :    AP 2187    (73) Applicant(s)       
(21)    Application No :    AP/P/2007/004060    TRIDENT ENERGY LIMITED, 2 Stone Buildings, Lincoln's       
            Inn, London WC2A 3TH,       
                   
(22)    Filing Date :    11.01.2006    United Kingdom       
(24)    Date of Grant &    13.12.2010           
                   
(45)    Publication :

(30)  Priority Data    (72) Inventors

    (33) Country    (31) Number    (32) Date    KELLY Hugh-Peter Granville, United Kingdom   
    GB        0500507.9    11.01.2005    (74) Representative   
(84)    Designated State           
                   
    BW    GM  GH    KE   MW  MZ    NA   SL   T Z    GALLOWAY & COMPANY   
    UG    ZW            ZIMBABWE       
                           
(51)    International    Classification    H02K 41/03 (2006.01)    H02K 35/00 (2006.01)   

(54)    Title

Improvements to tubular eletrical generators

(57)    Abstract

A tubular linear generator comprises an elongate translator (12), containing a series of permanent magnets (13, 14....) and one or more annular coils (not shown) contained within and affixed to a ferromagnetic sleeve (31). Relative movement between the translator and armature causes the generation of electricity in the coils. The sleeve is contoured in terms of permeability around

its circumference at one or both its ends, as shown at (32), in order to reduce cogging forces between the sleeve and the permanent magnets along the

(56)    Documents Cited :    DE 1912251 A1    US 3828211 A    US 5909066 A    WO 02/13211 A

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