4-7-2011

4-7-2011 - DESIGN OF ENGINEERING SYSTEMS II March 21, 2011...

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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 motors 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 March 21, 2011...

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