(a) What happens when the switch is closed? (b) What is the machine's maximum starting current? What is its steady-state angu- lar velocity at no load? r) Suppose a load is attached to the loop, and the resulting load torque is 10 N m. What would the new steady-state speed be? How much power is supplied to the shaft of the machine? How much power is being supplied by the battery? Is this machine a motor or a generator?

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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Example 7-1. Figure 7-6 shows a simple rotating loop between curved pole faces
connected to a battery and a resistor through a switch. The resistor shown models the total
resistance of the battery and the wire in the machine. The physical dimensions and charac-
teristics of this machine are
r = 0.5 m
1 1.0 m
R 0.3 N
B = 0.25 T
%3D
Vs = 120 V
%3D
fa) What happens when the switch is closed?
(b) What is the machine's maximum starting curent? What is its steady-state angu-
lar velocity at no load?
Y) Suppose a load is attached to the loop, and the resulting load torque is 10 N m.
What would the new steady-state speed be? How much power is supplied to the
shaft of the machine? How much power is being supplied by the battery? Is this
machine a motor or a generator?
(d) Suppose the machine is again unloaded, and a torque of 7.5 N • m is applied/to
the shaft in the direction of rotation. What is the new steady-state speed? lythis,
machine now a motor or a generator?
e Suppose the machine is running unloaded. What would the final steady-stale
speed of the rotor be ifNhe flux density were reduced to 0.20 T?
Transcribed Image Text:Example 7-1. Figure 7-6 shows a simple rotating loop between curved pole faces connected to a battery and a resistor through a switch. The resistor shown models the total resistance of the battery and the wire in the machine. The physical dimensions and charac- teristics of this machine are r = 0.5 m 1 1.0 m R 0.3 N B = 0.25 T %3D Vs = 120 V %3D fa) What happens when the switch is closed? (b) What is the machine's maximum starting curent? What is its steady-state angu- lar velocity at no load? Y) Suppose a load is attached to the loop, and the resulting load torque is 10 N m. What would the new steady-state speed be? How much power is supplied to the shaft of the machine? How much power is being supplied by the battery? Is this machine a motor or a generator? (d) Suppose the machine is again unloaded, and a torque of 7.5 N • m is applied/to the shaft in the direction of rotation. What is the new steady-state speed? lythis, machine now a motor or a generator? e Suppose the machine is running unloaded. What would the final steady-stale speed of the rotor be ifNhe flux density were reduced to 0.20 T?
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