DC Motors Micro Motors

14
DC Motors DC Motors Micro Motors Micro Motors Mark Lyon Brent Peterson

description

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. - PowerPoint PPT Presentation

Transcript of DC Motors Micro Motors

Page 1: DC Motors Micro Motors

DC MotorsDC MotorsMicro MotorsMicro Motors

Mark Lyon

Brent Peterson

Page 2: DC Motors Micro Motors

OutlineOutline

Motor OverviewDC vs. ACBrushless DC MotorsDesign ConsiderationsApplication ConsiderationsDC Micro Motors

Page 3: DC Motors Micro Motors

How a DC motor WorksHow a DC motor Works

lancet.mit.edu/motor/motor3.html

Page 4: DC Motors Micro Motors

DC vs. AC MotorsDC vs. AC Motors

DC Motor AC Motor

http://mot-sps.com/motor/tutorial/blac.html

Page 5: DC Motors 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

Page 6: DC Motors Micro Motors

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

Page 7: DC Motors Micro Motors

Brushless DC MotorBrushless DC Motor

http://mot-sps.com/motor/tutorial/blac.html

Page 8: DC Motors Micro Motors

DC Motor Torque/SpeedDC Motor Torque/Speed

http://lancet.mit.edu/motors/motors3.html#torque

Page 9: DC Motors Micro Motors

DC Motor Power/SpeedDC Motor Power/Speed

http://lancet.mit.edu/motors/motors3.html#torque

Page 10: DC Motors Micro Motors

DC Motor Electrical PowerDC Motor Electrical Power

Constant Voltage Constant Current

http://www.4p8.com/eric.brasseur/emamem.html

Page 11: DC Motors Micro Motors

Motor Application ConsiderationsMotor Application ConsiderationsService LifeService Life

http://www.micromo.com/03application_notes/tutorial4.asp

Page 12: DC Motors Micro Motors

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

Page 13: DC Motors Micro Motors

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)

Page 14: DC Motors Micro Motors

DC Micro MotorsDC Micro Motors

0

0.1

0.2

0.3

0.4

0.50.6

0.7

0.8

0.9

1

0 0.2 0.4 0.6 0.8 1 1.2

Weight (oz.)

Eff

icen

cy (

%)