Patent ID: 8742715
Filing Date: 2014-06-03
Classification: G01D

Abstract:
1. A sensor system for providing commutation control of an electric motor, comprising: an inductive angle sensor system including: a first inductive coil configured for affixation to a rotor shaft of the electric motor, the first inductive coil including a multi-pole winding, wherein rotation of the rotor shaft causes corresponding rotation of the first inductive coil; a second inductive coil fixedly mounted in spaced relationship to the first inductive coil, the second inductive coil including a multi-phase winding, wherein each of the first and second inductive coils has equal number of phases; an evaluation circuit coupled to the second inductive coil and to the electric motor operative to determine a rotor shaft angle for the rotor shaft of the electric motor through determining an induced voltage in each phase winding of the multi-phase winding in the second inductive coil created by position of the first inductive coil which creates a magnetic field between the first and second inductive coils and further operative to control electrical current distribution to the electric motor in dependence upon the determined rotor shaft angle of the rotor shaft; and an output load detector circuit that is separate from the evaluation circuit and is coupled to an output load of the rotor shaft of the electric motor operative to determine a difference between a current position of an output load coupled to the rotor shaft and a desired position for the output load.