Patent ID: 6492758
Filing Date: 2002-12-10
Classification: H02K

Abstract:
A polyphase transverse flux dc motor comprising:a rotor having a plurality of permanent magnets circumferentially disposed and separated by magnetically permeable material to provide alternating magnetic pole polarities at the periphery, said magnets being magnetised in the circumferential direction; and a stator mounted co-axially with said rotor so as to provide at least one air gap therebetween, said stator including: a first stator piece having a plurality of circumferentially disposed and spaced apart claw poles projecting in an axial direction, a second stator piece complementary to said first stator piece and mounted co-axially in facing relationship with said first stator piece such that there is an axial spacing therebetween and oriented about the common axis such that the claw poles of the second stator piece circumferentially alternate with the claw poles of the first stator piece, a plurality of magnetically permeable bridging cores disposed about the stator axis proximate to said claw poles and located between said first and second stator pieces to provide magnetic flux paths therebetween, at least one said stator piece being provided with regions of magnetic high reluctance between the sites of said bridging cores, and stator windings disposed about each bridging core each of which when supplied with an exciting current produce flux flow through stator claw poles in the first and second stator pieces which are proximate to the corresponding bridging core thereby producing flux in said at least one air gap adjacent to said proximate claw poles, each winding or a selected set of windings constituting the windings for one of a plurality of motor phases which in use are electronically commutated to produce a flux in said air gap which rotates about the stator axis.