Unformatted text preview: torque, using your expression for current. Although this problem may seem strange at first, it is actually used in practice. This type of machine is commonly referred to as a universal machine (since it can be run from a dc or ac source), and is sometimes used in handheld tools such as corded variable speed electric drills. Problem 32 – PM DC Machine Parameters When spun at a speed of 1000 rad/s, the open circuit armature voltage of a PM DC machine is 100 V. Next, the sped of the machine is reduced to 900 rad/s, and a 100 V source is applied to the machine terminals. The armature current is 20 A. What are the electrical parameters of the machine? Note: this is basically a slight variation of the procedure we considered in class....
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 Spring '08
 Staff
 Alternating Current, 0.2 Ohms, 2 nm, 1000 rad, 4 Ohms, 900 rad

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