By Gerhard Schweitzer (auth.), Eric H. Maslen, Gerhard Schweitzer (eds.)
Compiling the services of 9 pioneers of the sphere, Magnetic Bearings - thought, layout, and alertness to Rotating equipment deals an encyclopedic research of this swiftly rising box with a balanced combination of business and educational views. each component to the know-how is tested intimately, starting on the part point and continuing via a radical exposition of the layout and function of those platforms. The roster of authors boasts a normal of twenty-five years of labor constructing magnetic bearing expertise - a very extraordinary pool of experience.
The booklet is prepared in a logical model, beginning with an outline of the expertise and a survey of the diversity of purposes. A history bankruptcy then explains the imperative options of lively magnetic bearings whereas warding off a morass of technical information. From right here, the reader maintains to a meticulous, state of the art exposition of the part applied sciences and the style within which they're assembled to shape the AMB/rotor process. those approach types and function ambitions are then tied jointly via huge discussions of regulate equipment for either inflexible and versatile rotors, together with attention of the matter of procedure dynamics id. helping this, the problems of method reliability and fault administration are mentioned from numerous helpful and complementary views. on the finish of the publication, various precise suggestions and structures, together with micro-scale bearings, self-bearing automobiles, and self-sensing bearings, are positioned forth as promising instructions for brand new learn and development.
Newcomers to the sphere will locate the cloth hugely available whereas veteran practitioners could be inspired by way of the extent of technical aspect that emerges from a mix of subtle research and insights gleaned from many collective years of functional event. An exhaustive, self-contained textual content on energetic magnetic bearing expertise, this ebook can be a middle reference for someone trying to comprehend or improve platforms utilizing magnetic bearings.
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Compiling the services of 9 pioneers of the sphere, Magnetic Bearings - conception, layout, and alertness to Rotating equipment deals an encyclopedic learn of this quickly rising box with a balanced mixture of business and educational views. each portion of the expertise is tested intimately, starting on the part point and continuing via a radical exposition of the layout and function of those platforms.
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Additional info for Magnetic Bearings: Theory, Design, and Application to Rotating Machinery
E. when ω = 0. This is the case for a damping coeﬃcient d = 2 mk. Practical experience shows that, for a mechanical system with active magnetic bearings, critical or even higher damping can be achieved for the rigid body modes if the system provides low noise position (and velocity) signals. e. for the bending or ﬂexible modes, obtaining high or even critical damping is nearly impossible. Fig. 11. Closed-Loop eigenvalues for “natural” stiﬀness k = |ks | and damping m|ks | d = √ “Natural” damping is achieved for values 0 < d < 2 mk.
177–181, Dresden, Sept. 05. 36. C. Z. Chang. High-speed rotation of magnets on high-Tc superconducting bearings. J. Applied Physics, 56:397–399, 1990. 37. P. Mc Mullen, V. Vuong, and L. Hawkins. Flywheel energy storage system with active magnetic bearings and hybrid backup bearings. In H. Bleuler and G. Genta, editors, Proc. 10th Internat. Symp. on Magnetic Bearings, Martigny, Switzerland, Aug. 2006. 38. L. Nicolajsen. Experimental investigation of an eddy-current bearing. In Magnetic Bearings.
Natural” Stiﬀness Technically easiest to achieve is, of course, an “intermediate” or “natural” stiﬀness value. It is called “natural” since it is based on the design and size of the magnetic bearing itself. Such a net stiﬀness k will always be of the same order of magnitude as the negative bearing stiﬀness ks , typically 1 . . 3 × |ks |. Fig. 10. Closed-Loop eigenvalues for a “natural” stiﬀness k (P ≈ −2ks /ki ) For the special case of k = |ks | (P = −2ks /ki ) the absolute value of −ks /m), the open-loop and closed-loop eigenvalues will be equal (ω0 = according to the “rule of thumb” that the time constants of the open-loop system should be preserved by the control.
Magnetic Bearings: Theory, Design, and Application to Rotating Machinery by Gerhard Schweitzer (auth.), Eric H. Maslen, Gerhard Schweitzer (eds.)