11 Introduction to electromechanical energy conversion

11 Introduction to electromechanical energy conversion -...

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Lecture 13 Introduction to electromechanical energy conversion The main idea is to take electrical energy, pass it through an electromechanical converter and produce a force or torque, or vice versa. Consider the following experiment: an iron rod sitting in a piece of wood and a winding around the rod as in Figure 1 . Figure 1 - Experiment When the current flows through the coil and the flux through the rod, the space around the rod changes magnetically. If we place a metal ring into the rod and if the current is zero the ring will fall into the bottom and hit the wooden surface. If we increase the voltage, and hence the current, the ring will levitate due to a magnetic force that will counteract the gravity force. Figure 2 - Forces acting on the ring The metal ring will also increase its temperature due to a current flowing along it. Figure 3 - Cross-section of the ring and current flowing

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The temperature will be proportional to the power lost in the ring given by () 2 RR R P itR = , where R R is the resistance around the ring.
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This note was uploaded on 01/27/2011 for the course ECSE 361 taught by Professor Franciscodgaliana during the Spring '09 term at McGill.

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11 Introduction to electromechanical energy conversion -...

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