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Unformatted text preview: produced and in what direction (clockwise or counterclockwise) Problem 20 Stepper Motor Characterization Your measure the series resistance / inductance of a stepper motor with a series LCR meter. As you rotate the machine the resistance is constant and is equal to 3.3 Ohms. The inductance varies between 10 mH and 140 mH. Also, the inductance has 8 maximum as you rotate the shaft through a revolution. What is the stator resistance, the number of rotor teeth, A ls L L + , and B L ? Note: you will not be able to separate ls L from A L with the given information. Problem 21 Stable Equilibrium Point Consider a variable reluctance stepper motor with 4 rotor teeth. Suppose that B L is 200 mH. The a and cphases are energized with a current of 1 A. Suppose further that the load torque is 0.1 Nm. Find the stable equilibrium point closest to zero....
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 Spring '08
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 Electromagnet, Flux

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