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, and the controller adjusts operation of the electric machine as a function of the signals corresponding to the vibration detected at the first and second positions.
1 Assignment
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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.
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Citations
20 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, and the controller adjusts operation of the electric machine as a function of the signals corresponding to the vibration detected at the first and second positions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 one sensor mounted at a position proximate to the rotor, 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, and the controller identifies the vibration as one of a rotational vibration, a radial unidirectional vibration, an axial directional vibration, a mechanical resonance, and a motor inclination as a function of the signals corresponding to the vibration detected. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. 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; detecting a vibration present at a first position within the electric machine with a first sensor mounted at the first position; transmitting a signal corresponding to the vibration present at the first position from the first sensor to the controller; detecting a vibration present at a second position within the electric machine with a second sensor mounted at the second position, wherein the first position and the second position are located in a plane orthogonal to a shaft of the electric machine and wherein the shaft is connected to the rotor; transmitting a signal corresponding to the vibration present at the second position from the second sensor to the controller; and adjusting operation of the electric machine with the controller as a function of the signals corresponding to the vibration present at the first and second positions. - View Dependent Claims (17, 18, 19, 20)
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Specification