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ECE 321 Homework Set 6
Due Monday. Nov. 8
Must be turned in at beginning of class. Staple this page to front of your solutions. Home
work will be collected at beginning of class. If not submitted in time, it will not be graded.
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View Full Document1. Consider the reluctance machine
(inductances in mH)
Suppose that in steady state,
,
, and
where
and
are constant.
(a) For what value of
is
constant?
(b) For the value of
in (a), establish the value of
that maximizes
. What is the
value of maximum
? For this operating condition, sketch the timezero (
) cross
sectional view of the machine indicating the rotor position and the locations of
and
.
(c) Suppose
is as before but
. Show that the net stator mmf can
be expressed in the form (evaluate
and
)
:
2. Consider the PM synchronous machine in Fig. 7.21.
,
,
Suppose that in steady state,
,
, and
where
and
are constant.
(a) For what value of
is
constant?
(b) For the value of
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 Spring '08
 Staff
 Thermodynamics, Steady State, Cos, Mathematical constant, rotor, Electric Motors

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