Patent ID: 8519592
Filing Date: 2013-08-27
Classification: H02K

Abstract:
1. A synchronous electric motor, comprising: a rotor having a plurality of radially-oriented magnetic dipoles distributed circumferentially along a rotation direction of the rotor at equal intervals; and a stator having a plurality of stator teeth arranged circumferentially along the rotation direction of the rotor, wherein the plurality of stator teeth form stator teeth groups, each of the stator teeth groups including a predetermined number of consecutive stator teeth and the stator teeth groups being arranged at equal intervals, a plurality of sets of the stator teeth groups are formed such that any one stator teeth group in each set is in a same position in terms of electrical angle as one stator teeth group in any other set, so that the sets of consecutive stator teeth groups have rotational symmetry about a rotation axis of the rotor, for each of the stator teeth groups, the predetermined number of stator teeth included therein are arranged at intervals different from the intervals of the magnetic dipoles of the rotor, a main coil is wound around each of the predetermined number of stator teeth and a sub-coil is further wound around each of one or more stator teeth among the predetermined number of stator teeth, coils in a first phase are constituted by, in series, (i) the predetermined number of the main coils included in a given one of the stator teeth groups and (ii) one or more of the sub-coils included in one or more of the other stator teeth groups that are in a different position from the given one of the stator teeth groups in terms of electrical angle, and coils in a second phase are constituted by, in series, (i) one or more of the sub-coils included in the given one of the stator teeth groups and (ii) the predetermined number of the main coils included in one of more of the other stator teeth groups that are in a different position from the given one of the stator teeth groups in terms of electrical angle.