MIT2_007s09_lec03

# MIT2_007s09_lec03 - MIT OpenCourseWare http/ocw.mit.edu...

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Unformatted text preview: MIT OpenCourseWare http://ocw.mit.edu 2.007 Design and Manufacturing I Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . 2.007 –Design and Manufacturing I Actuators: Electric Motors, Servomotors, and Pneumatics Presented by Dan Frey on 10 FEB 2009 Dan Frey V- + E R w + i T, ω- Figure by MIT OpenCourseWare. Concept Question • With this arrangement, I can hold up 1lb of water with less that 1lb of tension in the spring • What will happen if I swap in a smaller diameter of PVC pipe (reduce the OD from 1.5” to 1.25”)? The tension will: 1) drop by much more than 20% 2) drop by about 20% 3) stay nearly the same 4) rise by about 20% 5) rise by much more than 20% Concept Question • With this arrangement, I can hold up 1lb of water with less that 1lb of tension in the spring • What will happen if I swap in a smaller diameter of PVC pipe (reduce the OD from 1.5” to 1.25”)? The tension will: 1) drop by much more than 20% 2) drop by about 20% 3) stay nearly the same 4) rise by about 20% 5) rise by much more than 20% The answer is 3. The capstan equation indicates that the ratio of the two forces is e^(mu*theta). Radius is not a variable in the formula. Some Notes on Capstans from 2.001 Courtesy Carol Livermore. Used with permission. How might I estimate the maximum power available at the output shaft ? The electrical power consumed ? HS-311 Standard Servo spec sheet removed due to copyright restrictions. Please see http://www.hitecrcd.com/product_file/file/45/HS311.pdf How do you think power provided by a servo scales with its linear dimensions? HS-805BB+ Mega ¼ Scale Servo spec sheet removed due to copyright restrictions. Please see http://www.hitecrcd.com/product_file/file/66/hs805.pdf What You May Have Seen Courtesy Gabriella Sciolla and Walter Lewin. Used with permission. DC Permanent Magnet Motor ) ( B v E q F K K K K × + = Image removed due to copyright restrictions. Please see http://static.howstuffworks.com/gif/motor7a.jpghttp://static....
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MIT2_007s09_lec03 - MIT OpenCourseWare http/ocw.mit.edu...

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