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Originally Posted by Stephen.Yanczura
Okay, I’ll chime in with a question.
Looking at the KOP FP motors that my team received the part number on the can is 00968-9003.
**searches through FIRST specs**
Those motors apparently have a free speed of 16,320 RPM at 12.000V. Thats all well and good but when you apply that to the andymark planetary gearset with a reduction of 3.67:1. That yields a free speed of 4446.87 RPM. Okay so what, right? Well being as the andymark planetary gear set fits up in the same mounting dimensions as the CIM motor I think most people (myself included) assume that the speed would match up. The CIM motor free wheels at 5310 RPM; that’s over an 800 RPM difference from the FP/AM. Clearly you cannot just say replace one of the CIMs in the KOP transmission with a FP/AM combo and have it work. Unless maybe the andymark gear set was designed for a different FP motor, perhaps one that spun about 20k RPM. If you run that number through the gearbox you get 5449.59 RPM, much closer to the CIM. I don't remember which of the ten or so different FP motors made 20k RPM (maybe 2004?). Anyway I guess I was just seeking some input on this, because I can see some people (myself included) possibly running into a problem here.
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Mark and I are looking into this. This lower rpm FP motor is definitely a suprise to us. We need to do some tests and report back soon. My initial reaction is that the FP motor will still be a boost of torque, but with a lower efficiency compared to a FP motor with a 20,000 free speed rpm.
Andy