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DC Motors Micro Motors. Mark Lyon Brent Peterson. Outline. Motor Overview DC vs. AC Brushless DC Motors Design Considerations Application Considerations DC Micro Motors. How a DC motor Works. lancet.mit.edu/motor/motor3.html. DC vs. AC Motors. DC Motor. AC Motor.
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DC MotorsMicro Motors Mark Lyon Brent Peterson
Outline • Motor Overview • DC vs. AC • Brushless DC Motors • Design Considerations • Application Considerations • DC Micro Motors
How a DC motor Works lancet.mit.edu/motor/motor3.html
DC vs. AC Motors DC Motor AC Motor http://mot-sps.com/motor/tutorial/blac.html
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
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
Brushless DC Motor http://mot-sps.com/motor/tutorial/blac.html
DC Motor Torque/Speed http://lancet.mit.edu/motors/motors3.html#torque
DC Motor Power/Speed http://lancet.mit.edu/motors/motors3.html#torque
DC Motor Electrical Power Constant Voltage Constant Current http://www.4p8.com/eric.brasseur/emamem.html
Motor Application ConsiderationsService Life http://www.micromo.com/03application_notes/tutorial4.asp
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