# a. Referring to fig 22.18a, ca

a. Referring to fig 22.18a, calculate the average current and also the peak current carried by the freewheeling diode.

b. What is the PIV across the diode?

Figure 22.18a

Problem 22-13

In Problem 22-12 (and referring to Fig, 22.9), if the same mass is lowered at a constant speed of 100 ft/min, calculate the following:

a. The armature current and its direction

b. The value of and its polarity

c. The value of and its polarity

d. In which direction doe~ the active power flow in the ac line?

figure 22.9

Problem 22-12

The hoist motor shown in fig 22.9 is lifting a mass of 5000 Ib at a constant speed of 400 ftlmin.

a. Neglecting gear losses, calculate the value of Eo if the armature current Id is 150 A.

b. Knowing that Ra = 0.1 Ω, calculate the value of converter voltage Ed

figure 22.9

Problem 22-14

In Problem 22-12, if the mass is simply held still in midair, calculate the following:

a. The value of Eo

b. The armature current lei

c. The value and polarity of Ed

problem 22-12

The hoist motor shown in fig 22.9 is lifting a mass of 5000 Ib at a constant speed of 400 ftlmin.

a. Neglecting gear losses, calculate the value of Eo if the armature current Id is 150 A.

b. Knowing that Ra = 0.1 Ω, calculate the value of converter voltage Ed

figure 22.9

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