December 2012
Beginner
528 pages
17h 31m
English
Content preview from Introduction to Electrical Power and Power Electronics
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280 Introduction to Electrical Power and Power Electronics
backward from the machine terminals. The machine now works as the generator,
and the load’s kinetic energy gradually depletes as it gets converted into electrical
power fed back to the source. To extract most of the kinetic energy of the load, we
keep lowering V
T
so that I
a
remains negative as the speed gradually drops to a low
value, when we switch to the mechanical brakes. The power fed back to the source
in this process is given by
PEIKIn
VK
In
R
=⋅=⋅⋅
−⋅⋅
aa f
Tf
a
() . (10.18)
In a simpler explanation, the motor back voltage is always less than the terminal
voltage, making the cur
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