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DC Motors Micro Motors

DC Motors Micro Motors

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DC Motors Micro Motors

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  1. DC MotorsMicro Motors Mark Lyon Brent Peterson

  2. Outline • Motor Overview • DC vs. AC • Brushless DC Motors • Design Considerations • Application Considerations • DC Micro Motors

  3. How a DC motor Works lancet.mit.edu/motor/motor3.html

  4. DC vs. AC Motors DC Motor AC Motor http://mot-sps.com/motor/tutorial/blac.html

  5. Advantages Simple Design Low Cost Reliable Operation Easily Found Replacements Many Different Environmental Enclosures Disadvantages Expensive Speed Control Inability to Operate at Slow Speeds Poor Positioning Control AC Advantages/Disadvantages

  6. Advantages Easy to Understand Design Easy to Control Speed Easy to Control Torque Disadvantages Expensive to Produce Can’t Reliably Control at Lower Speeds Physically Larger High Maintenance DC Advantages/Disadvantages

  7. Brushless DC Motor http://mot-sps.com/motor/tutorial/blac.html

  8. DC Motor Torque/Speed http://lancet.mit.edu/motors/motors3.html#torque

  9. DC Motor Power/Speed http://lancet.mit.edu/motors/motors3.html#torque

  10. DC Motor Electrical Power Constant Voltage Constant Current http://www.4p8.com/eric.brasseur/emamem.html

  11. Motor Application ConsiderationsService Life http://www.micromo.com/03application_notes/tutorial4.asp

  12. Motor Application Considerations • Audible Noise • Electrical Noise • Efficiency Emax = (1 - ((Mf/(Mst + Mf)).5)2 where: Emax = maximum motor efficiency Mf = motor friction torque Mst = motor stall torque http://www.micromo.com/03application_notes/tutorial4.asp

  13. DC Micro Motors

  14. DC Micro Motors