METHOD AND SYSTEM FOR DETECTING ROTOR FAULT
First Claim
1. A method of detecting a rotor fault in an electric machine 110 using a data analysis unit 120, the method comprising:
- a. measuring magnetic field strength along a first axis and a second axis, wherein the first axis is at a first angle to the axis of the rotor of the electric machine and the second axis is at a second angle to the axis of the rotor of the electric machine;
b. determining operating slip frequency of the electric machine 110 using the measured magnetic field strength along the first axis and the second axis, wherein determining operating slip frequency comprisesi. generating a first frequency spectrum from the measured magnetic field strength along the first axis and a second frequency spectrum from the magnetic field strength along the second axis;
ii. identifying a peak within a predetermined range in at least one of the first frequency spectrum and the second frequency spectrum; and
iii. determining a frequency corresponding to the identified peak within the predetermined range, in at least one of the first frequency spectrum and the second frequency spectrum;
c. determining an amplitude of the determined operating slip frequency in the first frequency spectrum and an amplitude of operating slip frequency in the second frequency spectrum; and
d. detecting the rotor fault by comparing the amplitude of the determined operating slip frequency in the first frequency spectrum and the amplitude of operating slip frequency in the second frequency spectrum against a predetermined threshold.
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Accused Products
Abstract
In aspects, the present invention discloses a method of detecting a rotor fault in an electric machine using a data analysis unit. The method comprises measuring magnetic field strength along a first axis and a second axis, determining operating slip frequency of the electric machine using the measured magnetic field strength along the first axis and the second axis, determining an amplitude of the determined operating slip frequency in a first frequency spectrum and an amplitude of operating slip frequency in a second frequency spectrum, and detecting the rotor fault by comparing the amplitude of the determined operating slip frequency in the first frequency spectrum and the amplitude of operating slip frequency in the second frequency spectrum against a predetermined threshold.
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Citations
7 Claims
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1. A method of detecting a rotor fault in an electric machine 110 using a data analysis unit 120, the method comprising:
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a. measuring magnetic field strength along a first axis and a second axis, wherein the first axis is at a first angle to the axis of the rotor of the electric machine and the second axis is at a second angle to the axis of the rotor of the electric machine; b. determining operating slip frequency of the electric machine 110 using the measured magnetic field strength along the first axis and the second axis, wherein determining operating slip frequency comprises i. generating a first frequency spectrum from the measured magnetic field strength along the first axis and a second frequency spectrum from the magnetic field strength along the second axis; ii. identifying a peak within a predetermined range in at least one of the first frequency spectrum and the second frequency spectrum; and iii. determining a frequency corresponding to the identified peak within the predetermined range, in at least one of the first frequency spectrum and the second frequency spectrum; c. determining an amplitude of the determined operating slip frequency in the first frequency spectrum and an amplitude of operating slip frequency in the second frequency spectrum; and d. detecting the rotor fault by comparing the amplitude of the determined operating slip frequency in the first frequency spectrum and the amplitude of operating slip frequency in the second frequency spectrum against a predetermined threshold. - View Dependent Claims (2, 3, 4)
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5. A system for detecting a rotor fault in an electric machine 110, the system comprising:
a. a data analysis unit 120, comprising; i. one or more magnetic field sensors for measuring magnetic field strength along a first axis and a second axis, wherein the first axis is substantially parallel to the axis of the rotor of the electric machine and wherein the second axis is at an angle to the first axis; ii. a network interface configured to communicate with a remote service device 130; iii. one or more processors configured to 1. generate a first frequency spectrum and a second frequency spectrum from the measured magnetic field strength along the first axis and the second axis; 2. identify a peak within a predetermined range in at least one of the first frequency spectrum and the second frequency spectrum; 3. determine operating slip frequency corresponding to the identified peak 4. detect the rotor fault based on an amplitude of the determined operating slip frequency in the first frequency spectrum and an amplitude of operating slip frequency in the second frequency spectrum; and iv. a memory module operatively coupled to the one or more processors. - View Dependent Claims (6, 7)
Specification