Method of and an apparatus for magnetising a plurality of adjacent portions of magnetisable material

摘要

A method of magnetizing members of magnetizable material ( 210 ) including presenting a magnetizer head to a circular array of the members ( 210 ) mounted on a rotor plate ( 200 ) of an electrical machine. The magnetizer head includes a circular array of coils ( 142 ), each coil ( 142 ) being positioned adjacent a respective one of the members ( 210 ). A current is supplied to selected juxtaposed pairs of the coils ( 142 ) so as to set up a magnetic field. Flux of the field forms a closed loop through the pair of coils ( 142 ) and the adjacent pair of members ( 210 ), such that uncontrolled flux leakage from this loop is minimized and such that the pair of members ( 210 ) are at least partially magnetized.