Patent ID: 6982532
Filing Date: 2006-01-03
Classification: H02K

Abstract:
1. An electric machine comprising: a stator assembly having a stator core and a coil supported by the stator core; a rotor assembly having a shaft and a rotor supported by the shaft for rotation with the shaft relative to the stator core, the rotor having a first magnetic pole and a second magnetic pole, the rotor being in magnetic interaction with the stator core; a single sensor configured to detect magnetic polarities of the rotor as the rotor rotates relative to the sensor and to generate a signal representing the detected magnetic polarities of the rotor, the signal being in a first state when the first magnetic pole is detected and a second state when the second magnetic pole is detected, the signal being inverted to form an inverted signal, the signal being utilized to control current through the coil in a first direction when the signal is in the first state and the inverted signal being utilized to control current through the coil in a second direction when the signal is in the second state, the current through the coil resulting in an alternating magnetic field in the stator core; and wherein at least a portion of the rotor and at least a portion of the shaft are encapsulated in an encapsulation material, and wherein the encapsulation material connects the rotor to the shaft.