Advances in Fluid Mechanics by E. Krause

By E. Krause

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CHAPTER 7 Distortions and Disturbances The real problem of magnetic positioning systems is distortions of the magnetic fields. The following are the three factors that cause distortions: 1. Reflections of the magnetic fields, which generate electromagnetic waves when the transmission is AC. 2. Induced magnetic fields from metallic elements in the system zone when the transmission is AC. 3. Distortions of the magnetic fields by ferromagnetic elements in the system zone when the transmission is AC or DC.

The symmetric pattern reduces it from 13 (4 × 3 + 1) to 2. From the expressions in step 6, we resolve w1 and e1 dependent on the Pn coefficients. Step 7: The geometry constraints: The distances from the new turn to the old turn wires must be greater than the minimum distance (Dmin) as defined by the PCB manufacturers. 6, we see the four distances d1u, d1l, d2u, and d2l in coil 1. The new vertices are (w1n, e1n) and (w2n, e2n). The distances are dependent only on w2n and e2n (we vanished w1n and e1n in Step 6).

Similarly, we choose a second coil, namely 2, to be in the xy-plane, which means H2 = (Hx2, Hy2, 0). Then, from Eq. 2: H122 = ðHx1 + Hx2Þ2 + Hy22 Magnetic Positioning Equations. 00008-8 Copyright © 2012 Elsevier Inc. All rights reserved.

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