Patent ID: 6969930
Filing Date: 2005-11-29
Classification: H02K

Abstract:
1. A half-stepping motor of the type having a rotor interacting magnetically with poles of a stator wound with stator coils driven by two-phase driver, the winding of the stator coils about the poles of the stator comprising: a first layer of stator coils characterized by a first number N1 of turns per stator pole and a second layer of stator coils characterized by a second number N2 of turns per stator pole, each layer having at least two stator coils wound about distinct groups of interleaved stator poles, a first layer of stator coils wound about a first group of poles being connected to a second layer of stator coils wound about a second group of poles and to a first phase of the driver, a first layer of stator coils wound about a second group of poles being connected to a second layer of stator coils wound about a first group of poles and to a second phase of the driver in quadrature relation to the first phase, with a turn ratio N2/N1, not equal to one, between the number of turns in the two layers of stator coils having been selected to provide a desired angular phase shift in torque profile of arctan (N2/N1).