Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-11-06
1994-04-26
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
318611, H02K 709
Patent
active
053069757
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for weakening interference forces created during seating of a body on magnetic bearings, the body being movable along at least one translational axis, which device includes a magnetic position control circuit connected between a sensor which provides a signal representing the position of the body relative to the bearings and a control unit having an input and an output for providing a signal to adjust the position of the body relative to the bearings, the control circuit having a unit defining two integrators.
The body on magnetic bearings can in particular be a rotor which generates interfering vibrations by its rotation, which are intended to be kept away from the stator. It can also pertain to a sensitive system, which is intended to be on bearings insulated from a vibrating environment.
A device for compensating synchronous interfering influences, stemming in particular from imbalanced masses, in a rotor on magnetic bearings having at least one radial magnetic bearing provided with coils, is known from German Patent Publication DE 26 58 668 A1. The bearing of the rotor has at least one sensing device for detecting the radial position of the rotor and a regulating circuit connected with the sensing device and the coils, which has a control circuit for supplying the coils. Signals from the sensing device are provided to the control circuit for regulating the position of the rotor in a predetermined radial position. The regulating circuit has a filter device between the sensing device and the control circuit, which constitutes a rejection filter on at least one frequency corresponding to the rotational speed of the rotor for the signals generated by the sensing device.
Furthermore, a magnetic bearing with a device for suppressing imbalance movements of the rotor is known from U.S. Pat. No. 4,841,184. The magnetic bearing contains coils which, together with a sensor device for measuring the rotor position and a control circuit connected therewith, are used for the generation of forces controlling the rotor position. The control device contains integrators for reconstructing signals corresponding to speed and acceleration from the position of the rotor. These signals are used as an additional feedback for the control.
Object
The object of the invention is to provide a device by means of which the vibrations acting on the body on magnetic bearings from the outside or acting on its surroundings and coming from the magnetic body can be suppressed.
The above and other objects are achieved, according to the present invention, in a device for weakening interference forces created during seating of a body on magnetic bearings, the body being movable along at least one translational axis, which device includes a magnetic position control circuit connected between a sensor which provides a signal representing the position of the body relative to the bearings and a control unit having an input and an output for providing a signal to adjust the position of the body relative to the bearings, the control circuit having means defining two integrators, by the improvement wherein:
the means defining two integrators comprise a first integrator and a second integrator each having a signal input and a signal output, the signal output of the first integrator being connected to the signal input of the second integrator so that the first and second integrators constitute a double integration unit, the signal input of the first integrator is connected to receive a signal having a value at least approximately proportional to a force capable of stabilizing the body relative to the bearings along at least one translational axis, and the double integration unit is operative for providing an output signal constituting an actual position value control signal from the control circuit; and
the control circuit further comprises means including a low frequency bandpass filter and attenuation members for applying to the inputs of both of the integrators a signal having a value which is a function
REFERENCES:
patent: 4128795 (1978-12-01), Habermann et al.
patent: 4629262 (1986-12-01), Hamilton
patent: 4691152 (1987-09-01), Ell et al.
patent: 4697128 (1987-09-01), Matsushita et al.
patent: 4839550 (1989-06-01), Mizuno et al.
patent: 4841184 (1989-06-01), Chen et al.
Ip-Abstract 1-83915, In: M-845, vol. 13, No. 289; Jul. 5, 1989.
Ip-Abstract 63-235715, In: M-787, vol. 13, No. 25, Jan. 2, 1989.
ANT Nachrichtentechnik GmbH
Nguyen Matthew
Stephan Steven L.
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