Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1988-08-25
1990-06-19
Paschall, M. H.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
318114, 318460, 318649, 361147, G05B 101
Patent
active
049358383
ABSTRACT:
A structural magnetic vibration controller and a method for actively controlling vibrations through the use of a magnetic coupling between a damper mass and a stationary component of rotary machinery wherein the stiffness and damping characteristics of the magnetic coupling are controlled as a function of the relative movements between a first electromagnet carried by the machinery and a second electromagnet carried by the damping mass. The magnetic fields of the magnetic coupling formed by counterpoised electromagnets are controlled by electronic current control circuitry to achieve dynamic tuning via stiffness and dampening characteristics of the magnetic coupling so as to suppress system resonances which occur during transient machinery operation as well as during steady state operation on the basis of a signal from position transducers that provides a displacement feedback that is utilized to vary the coupling stiffness, and a first derivative which is used to control the dampening characteristic of the coupling as a function of the rate at which the position sensed changes with respect to time.
REFERENCES:
patent: 3742862 (1973-07-01), Gebhardt et al.
patent: 4626754 (1986-12-01), Haberman et al.
patent: 4686404 (1987-08-01), Nakazeki et al.
patent: 4697128 (1987-09-01), Matsushit et al.
patent: 4757980 (1988-07-01), Schubert
patent: 4806835 (1989-02-01), Haberman
Barger Joel J.
Craig Philip J.
Gaffin Jeffrey A.
Paschall M. H.
Westinghouse Electric Corp.
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