Download Magnetic Bearings and Bearingless Drives by Akira Chiba, Tadashi Fukao, Osamu Ichikawa, Masahide Oshima, PDF
By Akira Chiba, Tadashi Fukao, Osamu Ichikawa, Masahide Oshima, Masatugu Takemoto, David G Dorrell
The applying of bearingless drives is rising as a tremendous strategy within the parts of high-speed equipment and motion-control, and this e-book goals to supply an intensive grounding within the ideas in the back of this state-of-the-art expertise. simple rules are defined intimately with useful examples to assist knowing, and the differing kinds of bearingless drives are brought, besides assurance of try machines and applications.Aimed at practicing electric and mechanical engineers and complicated scholars, Magnetic Bearings and Bearingless Drives offers a vital consultant to a space of engineering formerly in basic terms absolutely coated through huge numbers of educational papers. · distinctive and accomplished insurance of a state of the art topic for electric and mechanical engineers · A reference textual content and survey for designers, brands and clients of high-speed vehicles, turbines and electric force structures · Examines the fundamental rules at the back of magnetic bearings, with key applied sciences and functions illustrated via examples and case experiences
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Additional resources for Magnetic Bearings and Bearingless Drives
Example text
10 shows a permanent magnet motor. On the rotor, a cylindrical-ring permanent magnet is mounted on the shaft. The permanent magnet is premagnetized with two poles. On the stator, there are four salient poles. 10. Motor fluxes are produced by the permanent magnets. Therefore attractive magnetic forces exist between the rotor surface and stator poles. Normally, the sum of these forces is zero if the rotor is centred, and the currents in opposite coils are equal or zero. 6 A machine has a rotor with a diameter of 50 mm with an axial length of 50 mm.
60 × 5 cm = 13 1 cm2 . 360 The magnetic force is F = 4 kgf/cm2 × 0 7 T 2 × 13 1 cm2 = 25 7 kgf. 2 5 The rotor volume is V = × cm × 5 cm = 98 1 cm3 . 750 kg. This means that the magnetic force at one stator pole is about 34 times the force exerted by the rotor weight. Total magnetic force acting on the rotor is zero because radial forces under stator poles 1 and 3 cancel each other out. The forces under poles 2 and 4 also cancel. Substituting F = 0 750 × 9 8 N, S = 13 1 × 10−4 cm2 and B0 = 0 7 T into 2S F= B0 B gives B = 0 005 T.
21) is higher than the actual values under saturated conditions. 8(c) the co-energy based on the flux density equation is shown. , = Li. Since the flux density is proportional to the flux linkage, even in the nonlinear conditions, the operating point is A with flux linkage of 0 . Therefore the shaded area OA B is the co-energy variation. 8(b). Hence the overestimation of magnetic force can be avoided under saturated conditions. 25) is widely used in estimating the achievable magnetic force to avoid overestimation.