Patent ID: 9673685
Date: 2017-06-06
CPC Classifications: G01M,H02K,H02P

Claim:
1. An electric machine configured to be operated by a controller, the electric machine comprising: a housing; a stator mounted within the housing and configured to receive a voltage from the controller to control operation of the electric machine; a rotor rotatably mounted within the housing, wherein the rotor rotates as a function of the voltage applied to the stator; a shaft connected to the rotor and extending outside the housing, the shaft having a central axis about which it rotates; a first sensor mounted at a first position proximate to the shaft and configured to generate a signal corresponding to a vibration detected at the first position; and a second sensor mounted at a second position proximate to the shaft and configured to generate a signal corresponding to a vibration detected at the second position, wherein: the first position and the second position are located in a plane orthogonal to the central axis of the shaft, the signals corresponding to the vibration detected at the first and second positions are transmitted to the controller, the controller adjusts operation of the voltage provided to the stator as a function of the signals corresponding to the vibration detected at the first and second positions to reduce a magnitude of the vibration, the vibration detected at the first position by the first sensor is in a first axis, the first axis is oriented either tangentially to a rotation of the shaft or parallel to the central axis of the shaft, the vibration detected at the second position by the second sensor is in a second axis, and the second axis is located on an opposite side of the shaft and is oriented either tangentially to a rotation of the shaft or parallel to the central axis of the shaft.