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Automating Manufacturing Systems - Process Control and ...

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continuous actuators - 24.6<br />

ASIDE: A PWM signal can be used to drive a motor with the circuit shown below. The<br />

PWM signal switches the NPN transistor, thus switching power to the motor. In this<br />

case the voltage polarity on the motor will always be the same direction, so the<br />

motor may only turn in one direction.<br />

signal<br />

source<br />

V+<br />

DC motor<br />

V+<br />

V-<br />

power<br />

supply<br />

com<br />

Figure 24.5<br />

PWM Unidirectional Motor <strong>Control</strong> Circuit

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