System and method for detection of motor vibration
First 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, andthe 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.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved system for monitoring vibration of an electric machine is disclosed. According to one embodiment, sensors are positioned in a plane orthogonal to the motor shaft and each sensor detects vibration along at least one axis of the motor. The sensors are oriented such that the polarity of each sensor is reversed. The pairs of sensors may be used to isolate specific vibrations within the motor. According to another embodiment, a sensor may be mounted directly to the motor shaft. The sensor on the motor shaft directly detects vibrations along the motor shaft. Optionally, a second sensor may be mounted to a fixed location within the motor housing, and the combination of the sensor on the motor shaft and the sensor at a fixed location may be used to isolate specific vibrations within the motor. A motor controller may adjust operation of the motor to reduce the isolated vibration.
13 Citations
17 Claims
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1. An electric machine configured to be operated by a controller, the electric machine comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electric machine configured to be operated by a controller, the electric machine comprising:
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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 about a central axis as a function of the voltage applied to the stator; at least two sensors, each sensor mounted at a position proximate to the rotor and each sensor configured to generate a signal corresponding to a vibration detected at the position the sensor is mounted, wherein; each position is located in a plane orthogonal to the central axis, each signal is transmitted to the controller, the controller identifies a first vibration and a second vibration as a function of the signals corresponding to the vibration detected, wherein the first vibration identified is a different vibration than the second vibration identified and each of the first and second vibrations are selected from one of a rotational vibration, a radial unidirectional vibration, an axial directional vibration, a mechanical resonance, and a motor inclination, and the voltage received at the stator from the controller is varied as a function of the type of vibration identified to reduce the identified vibration. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of controlling operation of an electric machine, the method comprising the steps of:
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generating a voltage with a controller, wherein the voltage is provided to a stator of the electric machine, which, in turn, causes rotation of a rotor of the electric machine; generating a signal responsive to a vibration along a first axis present at a first position within the electric machine with a first sensor mounted at the first position wherein the signal generated by the first sensor has a positive magnitude and a negative magnitude and wherein the first axis is oriented either tangentially to a rotation of a shaft connected to the rotor or parallel to the central axis of the shaft; transmitting the signal corresponding to the vibration present at the first position from the first sensor to the controller; generating a signal responsive to a vibration along a second axis present at a second position within the electric machine with a second sensor mounted at the second position wherein; the signal generated by the second sensor has a positive magnitude and a negative magnitude, the positive magnitude of the first sensor is in the same direction as the negative magnitude of the second sensor, the first position and the second position are located in a plane orthogonal to a shaft of the electric machine, and the second axis is oriented either tangentially to a rotation of the shaft or parallel to the central axis of the shaft; transmitting the signal corresponding to the vibration present at the second position from the second sensor to the controller; and adjusting the voltage provided to the stator with the controller as a function of the signals corresponding to the vibration present at the first and second positions to reduce a magnitude of the vibration. - View Dependent Claims (15, 16, 17)
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Specification