Unformatted text preview: s: (2.41*108 J)
d. Determine the total required energy if only 75% of the total energy goes to launching the
plane (the rest is lost in heat and overcoming drag). Ans: (3.21*108 J)
e. Given the restriction on available average power from the ship power system, find the
minimum time required between catapult shots. Ans: (42.8s) Problem 2: You are given a PM DC motor intended for use in an electric car that uses a 72V
battery. You wish to determine the three parameters of the model: ,
, and
. You run the
following two tests:
Test 1: Apply 72VDC and measure
and
with no load
Test 2: Apply 72VDC and measure
and
with a load
a. Determine ,
, and
.
[ra = 0.118Ω, Kv = 0.36Vs, TLoss = 1.51Nm]
b. Determine the efficiency of the motor for the conditions of Test 2. [83.8%]
c. If we set
and
rotor speed (Assume that
[Ia = 25A, ω = 130.7r...
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 Fall '08
 STAFF
 Flux, Electric motor, armature voltage, PM DC motor

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