Techniques for monitoring gear condition
First Claim
1. A method comprising performing the following steps with respect to a system that comprises an electrical motor and a speed output unit, and the electrical motor is followed by a gear, wherein the following acts are performed by a data processing system operationally coupled to the system:
- monitoring a first set of frequencies from the system over a measurement period when the system is in a known good operating condition;
storing the first set of monitored frequencies or derivatives thereof as reference data in a long-term storage system;
monitoring a second set of frequencies from the system over a measurement period when the system is in an unknown operating condition;
comparing the second set of monitored frequencies with the first set of monitored frequencies in a frequency domain; and
in the frequency domain, detecting changes between corresponding frequencies resulting from the second set of monitored frequencies and the first set of monitored frequencies,wherein the electrical motor is driven by a motor drive, and the electrical motor and the motor drive are in a closed-loop configuration,wherein the motor drive utilizes a closed-loop speed feedback signal for controlling the electrical motor and the motor drive in the closed-loop configuration, and wherein at least some of the monitored frequencies are obtained from the closed-loop speed feedback signal or its derivative, andwherein the closed-loop speed feedback signal or its derivative comprises a rotational speed information of the electric motor, wherein the rotational speed information is sampled at equal intervals.
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Abstract
Method/apparatus for performing the following acts on a system that includes an electrical motor followed by a gear, and a speed output unit: monitoring a first set of frequencies from the system over a measurement period when the system is in a known good operating condition; storing the first set of monitored frequencies or derivatives thereof as reference data in a long-term storage system; monitoring a second set of frequencies from the system over a measurement period when the system is in an unknown operating condition; comparing the second set of monitored frequencies with the first set of monitored frequencies in a frequency domain; in the frequency domain, detecting changes between corresponding frequencies resulting from the second set of monitored frequencies and the first set of monitored frequencies.
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Citations
20 Claims
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1. A method comprising performing the following steps with respect to a system that comprises an electrical motor and a speed output unit, and the electrical motor is followed by a gear, wherein the following acts are performed by a data processing system operationally coupled to the system:
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monitoring a first set of frequencies from the system over a measurement period when the system is in a known good operating condition; storing the first set of monitored frequencies or derivatives thereof as reference data in a long-term storage system; monitoring a second set of frequencies from the system over a measurement period when the system is in an unknown operating condition; comparing the second set of monitored frequencies with the first set of monitored frequencies in a frequency domain; and in the frequency domain, detecting changes between corresponding frequencies resulting from the second set of monitored frequencies and the first set of monitored frequencies, wherein the electrical motor is driven by a motor drive, and the electrical motor and the motor drive are in a closed-loop configuration, wherein the motor drive utilizes a closed-loop speed feedback signal for controlling the electrical motor and the motor drive in the closed-loop configuration, and wherein at least some of the monitored frequencies are obtained from the closed-loop speed feedback signal or its derivative, and wherein the closed-loop speed feedback signal or its derivative comprises a rotational speed information of the electric motor, wherein the rotational speed information is sampled at equal intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A data processing system comprising:
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a memory system for storing program code instructions and data; a processing system including at least one processor, wherein the processing system executes at least a portion of the program code instructions and processes the data; and a connection to a system comprising at least a speed output unit and an electrical motor; wherein the memory system stores program code instructions that, when executed by the at least one processor, instruct the at least one processor to perform the following steps; monitoring a first set of frequencies from the system over a measurement period when the system is in a known good operating condition; storing the first set of monitored frequencies or derivatives thereof as reference data in a long-term storage system; monitoring a second set of frequencies from the system over a measurement period when the system is in an unknown operating condition; comparing the second set of monitored frequencies with the first set of monitored frequencies in a frequency domain; and in the frequency domain, detecting changes between corresponding frequencies resulting from the second set of monitored frequencies and the first set of monitored frequencies, wherein the electrical motor is driven by a motor drive, and the electrical motor and the motor drive are in a closed-loop configuration, wherein the motor drive utilizes a closed-loop speed feedback signal for controlling the electrical motor and the motor drive in the closed-loop configuration, and wherein at least some of the monitored frequencies are obtained from the closed-loop speed feedback signal or its derivative, and wherein the closed-loop speed feedback signal or its derivative comprises a rotational speed information of the electric motor, wherein the rotational speed information is sampled at equal intervals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification