Active broadband magnetic flux rate feedback sensing arrangement
First Claim
1. An active broadband magnetic flux rate feedback sensing arrangement, comprising:
- a magnetic circuit including a rotor and a stator, the stator carrying a drive coil and a sensor coil;
the stator and rotor cooperatively arranged so that a signal is induced in the sensor coil and the sensor coil provides a signal proportional to the rate of change of flux in the magnetic circuit;
means connected to the sensor coil for processing the flux rate of change signal therefrom and for providing a processed flux rate of change signal;
means for providing a command signal;
means connected to the processing means and to the command signal means for combining the processed flux rate of change signal and the command signal and for providing a combined signal;
compensating means connected to the combining means for applying broadband compensation to the combined signal and for providing a compensated combined signal;
modulating means connected to the compensating means for modulating the compensated combined signal and for providing a modulated compensated combined signal;
the drive coil connected to the modulating means for being energized by the modulated signal therefrom; and
the modulating means connected to the combining means for applying the modulated compensated combined signal thereto, whereby the modulated compensated combined signal is combined with the command signal and the processed flux rate of change signal for providing the combined signal.
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Accused Products
Abstract
An arrangement using sensing coils for obtaining flux rate of change information in a magnetic circuit. The arrangement can be used for vibration attenuation in a magnetic forcer system. Active (electric powered) circuitry is used to implement closed loop control of flux rate. The control loop is "broadband" since a broad range of vibration frequencies are attenuated. The arrangement can be applied to magnetic forcer/suspension systems in which vibrations due to magnetic mechanical/magnetic runouts, system mechanical resonances, or external vibration sources are present. The arrangement is particularly applicable for systems with a large number of varying vibration frequencies.
94 Citations
10 Claims
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1. An active broadband magnetic flux rate feedback sensing arrangement, comprising:
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a magnetic circuit including a rotor and a stator, the stator carrying a drive coil and a sensor coil; the stator and rotor cooperatively arranged so that a signal is induced in the sensor coil and the sensor coil provides a signal proportional to the rate of change of flux in the magnetic circuit; means connected to the sensor coil for processing the flux rate of change signal therefrom and for providing a processed flux rate of change signal; means for providing a command signal; means connected to the processing means and to the command signal means for combining the processed flux rate of change signal and the command signal and for providing a combined signal; compensating means connected to the combining means for applying broadband compensation to the combined signal and for providing a compensated combined signal; modulating means connected to the compensating means for modulating the compensated combined signal and for providing a modulated compensated combined signal; the drive coil connected to the modulating means for being energized by the modulated signal therefrom; and the modulating means connected to the combining means for applying the modulated compensated combined signal thereto, whereby the modulated compensated combined signal is combined with the command signal and the processed flux rate of change signal for providing the combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for sensing flux rate of change in a magnetic circuit, comprising:
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supporting a drive coil and a sensor coil on a stator; arranging the stator and a rotor in a magnetic circuit for inducing a signal in the sensor coil which is proportional to the rate of change of flux in the magnetic circuit; processing the flux rate of change signal; providing a command signal; combining the processed flux rate of change signal and the command signal; applying broadband compensation to the combined flux rate of change signal and the command signal; modulating the compensated combined signal; using the modulated compensated combined signal for energizing the drive coil; and combining the modulated compensated combined signal with the command signal and the processed flux rate of change signal for providing the combined signal. - View Dependent Claims (10)
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Specification