Patent ID: 7202623

Claim:
A method for starting-up a motor having multiple stator windings and a rotor, comprising: providing a current to a first winding and a second winding to excite a predefined initial excitation phase and allowing a third winding to be floating; masking a time period to reach a state with reduced parasitic detection; from the predefined initial excitation phase being currently excited, commutating to a next first excitation phase, which is adjacent to the predefined initial excitation phase in a predetermined sequence of excitation phases, if a zero-crossing point of BEMF for the third winding occurs in the third winding within a maximum startup time; commutating to a next second excitation phase after commutating to the next first excitation phase when a zero-crossing point of BEMF of the second winding has been detected; commutating to a next third excitation phase, which is functionally shifted by two phase-intervals from the predefined initial excitation phase if no zero crossing point of BEMF of the third winding occurs in the third winding within the maximum startup time; and commutating to a next fourth excitation phase after commutating to the next third excitation phase when a zero-crossing point of BEMF of the first winding has been detected.