Quote:
Originally Posted by Ether
Did you record the CIM RPM under those test conditions?
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Yes, but that data doesn't matter for the question you posed: compare rates of temperature rise. Waste heat dissipated by the CIM and mini-CIM depends almost entirely on torque loading.
My test was intended to check Paul's design goal for the mini-CIM, which he has stated was to share load with a CIM (at 1:1 gearing) while taking about 2/3 of the CIM's torque; i.e., the mini-CIM takes 2/3 N-m for each 1 N-m taken by the CIM, so the motors share the torque loading about 60:40.
My results indicate that Paul actually exceeded his design goal (
) since the mini-CIM's internal temperature is rising more slowly than the CIM's while it delivers 40% of the total load torque.
Conclusion: if your drivetrain needs more power than one CIM can deliver, but not as much as two CIMs, then one CIM and one mini-CIM is an excellent combination. You can run them at the same speed, and mini-CIM internal temperature rise will NOT be a limiting factor.
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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)