Electrical Motor Controls for Integrated Systems
Electrical Motor Controls for Integrated Systems
5th Edition
ISBN: 9780826912268
Author: Gary Rockis;Glen A. Mazur
Publisher: American Technical Publishers
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Chapter 2.2, Problem 4CP
To determine

To explain: The electrical device is used to provide both start and stop includes overload protection to motor.

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Magnetic Field Analysis of a Helical Coil In this lab you will analyse the inductive coil structure shown in Figure 1. It comprises a solid round copper wire of radius a = 0.8mm, wound into a cylindrical spiral having N = 20 turns, major radius R = 10mm and an axial pitch p = 2mm. The coil is excited by a dc current of 1A. R P 1 (a) Analytic Calculations Figure 1: Helical Air-cored Coil Using the expressions developed in the class, estimate the magnetic flux density B at the centre of the coil. Recall from EN1216 that for a long solenoid, the flux density is given by: HONI B l As we saw in the class (see section 4) a modified expression can also be derived that eliminates the need for the 'long' solenoid assumption: R α1 Р â B = HONI 2l (cosa₂-cosα1) 1 Compare the results obtained using equations (1) and (2) and state which solution you would expect to give the best approximation to the real coil behaviour.
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