Methods and apparatus for vibration detection
First Claim
1. Apparatus for detecting a vibration of an object adapted for rotation, comprising:
- a plurality of magnetic field sensors for generating an RDIFF signal proportional to a magnetic field at a first location relative to the object and an LDIFF signal proportional to a magnetic field at a second location relative to the object;
at least two rotation detectors, wherein a first one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the RDIFF signal for providing a first output signal indicative of rotation of the object and wherein a second one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the LDIFF signal for providing a second output signal indicative of rotation of the object; and
at least one of;
a direction-change processor coupled to at least one of the rotation detectors to detect the vibration of the object in response to a change in the direction of rotation of the object as indicated by the output signal of the at least one rotation detector and to generate a direction-change output signal in response to the vibration;
a phase-overlap processor to identify a first signal region associated with the RDIFF signal and a second signal region associated with the LDIFF signal, and to identify an overlap of the first signal region and the second signal region and to generate a phase-overlap output signal in response to the overlap; and
a direction-agreement processor coupled to the at least two rotation detectors to detect the vibration of the object in response to a disagreement in the direction of rotation of the object as indicated by output signals of the at least two rotation detectors and to generate a direction-agreement output signal in response to the vibration.
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Accused Products
Abstract
Apparatus for detecting vibration of an object adapted to rotate includes one or more vibration processors selected from: a direction-change processor adapted to detect changes in a direction of rotation of the object, a direction-agreement processor adapted to identify a direction of rotation of the object in at least two channels and identify an agreement or disagreement in direction of rotation identified by the at least two channels, and a phase-overlap processor adapted to identify overlapping signal regions in signals associated with the rotation of the object. A method for detecting the vibration of the object includes generating at least one of a direction-change output signal with the direction-change processor, generating a direction-agreement output signal with the direction-agreement processor, and generating a phase-overlap output signal with the phase-overlap processor, each indicative of the vibration of the object.
77 Citations
36 Claims
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1. Apparatus for detecting a vibration of an object adapted for rotation, comprising:
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a plurality of magnetic field sensors for generating an RDIFF signal proportional to a magnetic field at a first location relative to the object and an LDIFF signal proportional to a magnetic field at a second location relative to the object;
at least two rotation detectors, wherein a first one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the RDIFF signal for providing a first output signal indicative of rotation of the object and wherein a second one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the LDIFF signal for providing a second output signal indicative of rotation of the object; and
at least one of;
a direction-change processor coupled to at least one of the rotation detectors to detect the vibration of the object in response to a change in the direction of rotation of the object as indicated by the output signal of the at least one rotation detector and to generate a direction-change output signal in response to the vibration;
a phase-overlap processor to identify a first signal region associated with the RDIFF signal and a second signal region associated with the LDIFF signal, and to identify an overlap of the first signal region and the second signal region and to generate a phase-overlap output signal in response to the overlap; and
a direction-agreement processor coupled to the at least two rotation detectors to detect the vibration of the object in response to a disagreement in the direction of rotation of the object as indicated by output signals of the at least two rotation detectors and to generate a direction-agreement output signal in response to the vibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for detecting a vibration of an object adapted for rotation, comprising:
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a plurality of magnetic field sensors for generating an RDIFF signal proportional to a magnetic field at a first location relative to the object and an LDIFF signal proportional to a magnetic field at a second location relative to the object;
at least two rotation detectors, wherein a first one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the RDIFF signal for providing a first output signal indicative of rotation of the object and wherein a second one of the rotation detectors is coupled to at least one of the magnetic field sensors and is responsive to the LDIFF signal for providing a second output signal indicative of rotation of the object; and
a vibration processor responsive to the first and second output signals from the at least two rotation detectors for detecting the vibration of the object. - View Dependent Claims (10, 11, 12, 13)
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14. A method for detecting a vibration of an object, comprising:
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providing a first output signal indicative of a rotation of the object with a first rotation detector;
providing a second output signal indicative of a rotation of the object with a second rotation detector;
detecting a change in direction of rotation of the object from the first and the second output signals; and
generating a direction-change output signal in response to the change in direction. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of detecting a rotation of an object, comprising:
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providing a first output signal indicative of a rotation of the object with a first rotation detector;
providing a second output signal indicative of a rotation of the object with a second rotation detector;
providing a third output signal indicative of a rotation of the object with a third rotation detector;
providing a fourth output signal indicative of a rotation of the object with a fourth rotation detector;
detecting a first direction of rotation of the object with the first rotation detector and with the second rotation detector;
detecting a second direction of rotation of the object with the third rotation detector and with the fourth rotation detector;
determining whether the first direction of rotation is the same as the second direction of rotation; and
generating a direction-agreement output signal in response to the determination. - View Dependent Claims (27, 28, 29, 30)
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31. A method of detecting a rotation of an object, comprising:
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detecting a magnetic field with a first magnetic field sensor at a first location relative to the object to provide an RDIFF signal;
detecting a magnetic field with a second magnetic field sensor at a second location relative to the object to provide an LDIFF signal;
identifying a first signal region associated with the RDIFF signal and a second signal region associated with the LDIFF signal;
identifying an overlap of the first signal region and the second signal region; and
generating a phase-overlap output signal in response to the overlap. - View Dependent Claims (32)
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33. A peak-referenced detector for detecting rotation of an object adapted to rotate, comprising:
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a DIFF signal generator adapted to generate a DIFF signal proportional to magnetic field generated by the object when rotating;
mean for identifying a positive peak value corresponding to a positive peak of the DIFF signal;
means for identifying a negative peak value corresponding to a negative peak of the DIFF signal;
means for generating a first threshold as a first predetermined percentage below the positive peak value;
means for generating a second threshold as a second predetermined percentage above the negative peak value; and
a comparator for comparing the first and second thresholds to the DIFF signal to generate an output signal indicative of the rotation of the object. - View Dependent Claims (34, 35, 36)
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Specification