Patent ID: 6504272
Filing Date: 2003-01-07
Classification: H02K

Abstract:
A multi-phase electric rotating machine having toroidal coils, comprising:a stator including a number P of stator units (P is integer satisfying P&gE;2) each of which is formed of a pair of stator iron cores made from magnetic material and a toroidal coil disposed between said pair of stator iron cores, each of said stator iron cores being provided with a number Ns of stator teeth formed around an inner circumference at equal pitch Ps, said pair of stator iron cores of said each stator unit being arranged such that said stator teeth are shifted to each other by Â½ of the pitch Ps, and said number P of stator units being concentrically connected to be arranged in a direction of a rotating shaft such that said stator teeth of said stator units are shifted to one another by Â½P of the pitch Ps; and a rotor that faces said stator with a predetermined air gap and is rotatable, said rotor consisting of at least one rotor unit that has a permanent magnet and Nr number of rotor teeth made from magnetic material arranged around said permanent magnet in the rotating direction of said rotor, said rotor teeth consisting of k pairs of N (north) polar rotor teeth groups and k pairs of S (south ) polar rotor teeth groups (K is integer satisfying k&gE;1), wherein each of the rotor teeth is extended substantially the entire length of said rotor arranged in said rotating direction, said each N polar rotor teeth group consisting of a number (Nr/2k) of N rotor teeth that are adjacently arranged in the rotating direction, and said each S polar rotor teeth group consisting of the number (Nr/2k) of S rotor teeth that are adjacently arranged in the rotating direction.