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Automating Manufacturing Systems - Process Control and ...

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continuous actuators - 24.15<br />

running capacitor<br />

Capacitor Start <strong>and</strong> Capacitor Run Motor<br />

starting capacitor<br />

Vin<br />

running<br />

winding<br />

squirrel cage<br />

rotor<br />

starting winding<br />

Figure 24.13<br />

Single Phase Motor Configurations<br />

24.2.3 Brushless DC Motors<br />

Brushless motors use a permanent magnet on the rotor, <strong>and</strong> use windings on the<br />

stator. Therefore there is no need to use brushes <strong>and</strong> a commutator to switch the polarity of<br />

the voltage on the coil. The lack of brushes means that these motors require less maintenance<br />

than the brushed DC motors.<br />

A typical Brushless DC motor could have three poles, each corresponding to one<br />

power input, as shown in Figure 24.14. Each of coils is separately controlled. The coils are<br />

switched on to attract or repel the permanent magnet rotor.

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