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Re: Solenoid from a car door, any car door: are they legal in 2016?
Quote:
Originally Posted by GeeTwo
Agreed, and further, because the peak power output is usually around half speed, where the back-EMF is half the input voltage, the continuous power draw is even less. My point was that if the resistance was 14.4 ohms or higher, the device could not dissipate/convert a total of more than 10W. The actual resistance of a 10W motor could be much lower.
For example, the static resistance of a CIM is around 0.09 ohm, which tells you that its maximum power is no more than 144/0.09 = 1600W. The rating is about 337W.
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You're right about the impact of back-EMF on output power of electromechanical energy conversion devices. However, the rule governing solenoid actuator ratings is expressed as a limit on continuous duty electrical input power.
The CIM example is interesting to FRC competitors; however, our CIM motors do not have a continuous rating. Their normal load (4 lbf-in, 27A at 12V) is the basis for an intermittent test cycle with 16.7% duty. See the data sheet (excerpt attached).
__________________
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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