Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1996-04-19
1999-08-10
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318439, 318254, 318138, 318560, G05B 106
Patent
active
059363703
ABSTRACT:
An electromagnetic rotating machine driven by an electromagnetic action between a stator and a rotor has drive windings fitted to the stator for generating a rotating magnetic field for rotatably driving the rotor, position control windings fitted to the stator for generating a magnetic field having a different number of poles than that of the drive windings, a magnetic force generation circuit for generating a magnetic force to act on the rotor by supplying the position control windings with an electric current effective to unbalance the magnetic field on the stator side, a circuit for detecting an induced voltage or current generated in the one or more position control windings in response to radial displacement of the rotor and the rotating magnetic field generated by the drive windings, a circuit for detecting radial displacement of the rotor based on the induced voltage or current and the magnitude and speed of the rotating magnetic field, and a position control circuit for controlling the radial position of the rotor by changing the magnetic force generated by the magnetic force generation circuit in accordance with the detected radial displacement of the rotor.
REFERENCES:
patent: 4743815 (1988-05-01), Gee et al.
patent: 5023527 (1991-06-01), Erdman et al.
patent: 5659231 (1997-08-01), Svarovsky et al.
Proceedings of the International Symposium on Magnetic Bearings, Jul. 29, 1992, Y. Okada et al., pp. 176-183, "Sensorless Magnetic Levitation Control by Measuring the PWM Carrier Frequency Component".
IEEE Transactions on Energy Conversion, vol. 9, No. 1, Mar. 1, 1994, pp. 61-68, A. Chiba et al., "An Analysis of Bearingless AC Motors".
Chiba Akira
Fukao Tadashi
Michioka Chikara
Ebara Corporation, Nikkiso Co., Ltd.
Lockett Kim
Seiko Seiki Co., Ltd.
Shoop Jr. William M.
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