OutlineOutline
Motor OverviewDC vs. ACBrushless DC MotorsDesign ConsiderationsApplication ConsiderationsDC Micro Motors
AC Advantages/DisadvantagesAC Advantages/Disadvantages
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
DC Advantages/DisadvantagesDC 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 Motor Electrical PowerDC Motor Electrical Power
Constant Voltage Constant Current
http://www.4p8.com/eric.brasseur/emamem.html
Motor Application ConsiderationsMotor Application ConsiderationsService LifeService Life
http://www.micromo.com/03application_notes/tutorial4.asp
Motor Application ConsiderationsMotor 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
DC Micro MotorsDC Micro Motors
0
2
4
6
8
10
12
0 0.2 0.4 0.6 0.8 1 1.2
Weight (oz.)
Max
. P
ow
er (
Wat
ts)