4-7-2011

4-7-2011 - DESIGN OF ENGINEERING SYSTEMS II • Brushed...

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Unformatted text preview: DESIGN OF ENGINEERING SYSTEMS II March 21, 2011 • Brushed permanent magnet DC motors provide continuous motion at some controllable speed • What if we like to control the position ? Brushed or brushless DC motor will work but you may need other components such as encoders to work in closed-loop If our goal is position control with less hardware, we can look into stepper motors • For stepper motor, the position control can be implemented by open ‐ loop (if design within motor specs and constraints). Stepper Motors DESIGN OF ENGINEERING SYSTEMS II March 21, 2011 • Permanent magnet stepper motor structure is very similar to that of brushless DC motors. • The difference is that we want the stepper motor’s rotor to rotate to a given position, stop, and hold that position. How Stepper Motors Work http://www.freescale.com/files/microcontrollers/doc/app_note/ AN2974.pdf http://www.sparkfun.com/products/9238 DESIGN OF ENGINEERING SYSTEMS II March 21, 2011 How Stepper Motors Work http://www.freescale.com/files/microcontrollers/doc/app_note/AN2974.pdf DESIGN OF ENGINEERING SYSTEMS II March 21, 2011 • Sequence of currents • Number of steps per revolution (full step) = 2 ??¡?...
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4-7-2011 - DESIGN OF ENGINEERING SYSTEMS II • Brushed...

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