Patent ID: 6765321
Filing Date: 2004-07-20
Classification: H02K

Abstract:
A three-phase toroidal coil type electric rotating machine comprising:a permanent magnet rotor that comprises a cylindrical permanent magnet having M pairs of N-poles and S-poles that are alternatively arranged around a rotor axis; and a stator that comprises three stator units stacked in an axial direction with an air gap with respect to the external wall of said cylindrical permanent magnet, each of said stator units having a pair of stator magnetic poles and a toroidal coil that is sandwiched between said stator magnetic poles, each of said stator magnetic poles being made of magnetic material to have M pieces of claw poles extending in the axial direction, said stator magnetic poles of each stator unit being arranged such that the claw poles of the respective stator magnetic poles are in mesh with each other inside said toroidal coil; wherein terminals of said toroidal coils mounted on said three stator units are connected as a star connection or a delta connection to be three-terminal feeding, wherein the rotor magnet poles are positioned so that flux linkage of each phase is independent flux linkage of only the corresponding phase thereof and the rotor magnet poles are opposite to the stator claw poles of each phase when the flux linkage becomes maximum, and wherein the positional relationship between said claw poles of said stator units and said cylindrical permanent magnet is determined such that the phase differences among speed electromotive forces caused in said toroidal coils of the respective phases due to said independent flux linkage are 120 degrees (electrical angle) between any two of said three terminals.