Problem 101-1    Source:   Adapted from example 1-10 - page 43 - CHAPMAN, Stephen J. -    Book: Fundamentals of Electric Machines - 5th edition - Ed. McGrawHill - 2013.

The linear machine shown in Figure 101-01.1 is supplied with a voltage V = 120 V and a resistance internal equal to 0.3 Ω. The magnetic flux density is 0.1 T with orientation entering the page. The length of the bar is L = 10 m. Find:

a) The maximum starting current of the machine.

b) The steady state speed without load.

c) The steady state speed if a force of 30 N pointing to the right were applied to the bar.

d) The power that the bar would be producing or consuming.

e) The power that the voltage source would be producing or consuming.

f) Explain the difference between these last two numerical values. Does this machine work as a motor or as a generator?

Problem 101-2    Source:   Adapted from example 1-10 - page 43 - CHAPMAN, Stephen J. -    Book: Fundamentals of Electric Machines - 5th edition - Ed. McGrawHill - 2013.

Considering the previous problem (Problem 101-1), find:

a) The steady-state speed if a force of 30 N pointing to the left were applied to the bar. Would this machine be a motor or a generator?

b) Assume that the bar is unloaded and that it suddenly enters a region where the magnetic field is weakened having the value of 0.08 T. How fast is the bar? will it move?