12.05.2014 Views

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

Automating Manufacturing Systems - Process Control and ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

continuous actuators - 24.3<br />

comm<strong>and</strong><br />

generator<br />

(e.g., PLC)<br />

desired position<br />

or velocity<br />

controller<br />

voltage/<br />

current<br />

power<br />

amp<br />

amplified<br />

voltage/<br />

current<br />

motor<br />

encoder<br />

Figure 24.1<br />

A Typical Feedback Motor <strong>Control</strong>ler<br />

24.2.1 Basic Brushed DC Motors<br />

In a DC motor there is normally a set of coils on the rotor that turn inside a stator<br />

populated with permanent magnets. Figure 24.2 shows a simplified model of a motor. The<br />

magnets provide a permanent magnetic field for the rotor to push against. When current is<br />

run through the wire loop it creates a magnetic field.<br />

I<br />

I<br />

magnetic<br />

field<br />

axis of<br />

rotation ω<br />

www.PA<strong>Control</strong>.com

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!