PhD Thesis - Cranfield University

Chapter 7
Based on the previous design equations, the generalized structural model of the proposed
multi-layered inductor is as shown in Figure 7.8 with the final assembled unit shown in
Figure 7.9.
Air core
2 mm
8 mm
Enameled copper
conductor
d
Figure 7.8 Inductor design using flanged air core former and enameled copper conductors
Parameter Design Value Final Value
N 70 turns
70 turns
(10 turns ,7 layers) (10 turns ,7 layers)
r 63.5 mm 63 mm
l 89 mm 90 mm
b 30.5 mm 30 mm
ue 1 H/m 1 H/m
Total height Not considered 108 mm
Total diameter Not considered 153 mm
DC resistance Not considered 0.03 ohms
(measured)
Inductance 410 µH 392 µH
(measured)
Mass Not considered 4.8 kg
197
l
108 mm
Figure 7.9 Inductor specification and physical ‘as-built’ configuration
r
b
153 mm
The series resistance of the inductor R L(DC) introduces a power loss during operation as,
Loss
2
L
P L = I ⋅ R
(7-67)
L(
DC)
where I L is the DC component or mean value of the inductor current