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Re: Powering and controlling Window Motors
Quote:
Originally Posted by Al Skierkiewicz
Trent,
My guess is that the left hand motors generally will get more use so they are built a little heavier. Economy of using slightly smaller wire in one design adds up when you are producing a few million units.
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Quote:
Originally Posted by kamocat
Doesn't this have to do with the brush angle and phase offset?
Many brushed DC motors are more efficient in one direction than the other.
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kamocat is correct about the effect of brush angle. But Al's explanation is the right one in this case.
I've been an electric motor designer for many years. Two general rules govern sizing of motors: (1) magnetic circuits (the magnets and steel cores) are sized to provide the required maximum torque, and (2) electric circuits (the windings) are sized to provide the required cycle of service without overheating, and without wearing out the insulation too soon. In this case, the service cycle of Left Window motors is indeed more severe than that of Right Window motors.
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Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
 since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)
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