Adaptive noise cancelling for magnetic bearing auto-balancing

Details Adaptive noise cancelling for magnetic bearing auto-balancing Adaptive noise cancelling for magnetic bearing auto-balancing

1988-12-27

1990-03-27

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Unwanted harmonic or voltage component elimination...

318605, 318661, 318648, 310 905, 358165, 358166, 358167, G05B 1101

Patent

active

049123874

ABSTRACT:
A separate adaptive noise canceller receiving a reference input of a rotor speed synchronization pulse is connected in the X and Y axis positional control loops of a magnetic bearing utilized to position a rotor suspended thereby. The output of the noise canceller is self-adjusting by the inclusion of an adaptive filter implementing a least mean square algorithm to force the gain of the control loop to zero at not only the fundamental of the rotational speed, but all harmonic frequencies thereof, thereby reducing the vibration and control system power dissipation of the magnetic bearing at the rotational fundamental as well as at the rotational harmonics.

REFERENCES:
patent: 4121143 (1978-10-01), Habermann et al.
patent: 4673982 (1987-06-01), Tam et al.
"Adaptive-Noise Cancelling: Principles And Applications", Widrow, et al., Proceedings Of The IEEE, vol. 63, No. 12, Dec., 1975, pp. 1692-1716.

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