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#16
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Re: CIM Quiz 2
Quote:
Looking back, I think my eyes wandered by a box or two when I read the speed. |
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#17
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Re: CIM Quiz 2
I was making the assumption that one had already combined the two motors into one equation by gearing the FP to match the CIM (with the CIM at 1:1). I should have been more clear.
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#18
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Re: CIM Quiz 2
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http://www.chiefdelphi.com/media/papers/download/2593 Indeed, I try to do my math to confirm that I will get what I need without popping breakers. In addition, I've seen even a fresh battery drop voltage when you are pulling power to the drive train: doing your calculations at 12 volts may result in a performance problem in the field. Just our experience though, perhaps others differ. |
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#19
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Re: CIM Quiz 2
Quote:
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#20
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Re: CIM Quiz 2
Does anyone know the continuous current rating for the FP's? I'm pretty sure the CIM is about 27A, and so that impeller would make sense to work with it, but for the FP? I'd imagine replacing it every match.
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#21
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Re: CIM Quiz 2
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For the FP @ 10.5 volts and 35 amps it says 0.222 Nm, 623.7 rad/sec... = 138 watts, not 180 watts. The spreadsheet is pretty busy. Am I reading it wrong? |
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#22
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Re: CIM Quiz 2
cim w/ 1:12 gearbox, fp w/ 1:6
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#23
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Re: CIM Quiz 2
How did you come up with these numbers?
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#24
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Re: CIM Quiz 2
my head, since the RPm of an Fp motor is roughly double that of a cim, the cim will have to travel twice as fast
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#25
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Re: CIM Quiz 2
CIM max power is 337 watts @ 2655 RPM
FP max power is 184 watts @ 7500 RPM Total max power is 521 watts sqrt(521*81500) = 6516.25 6516.25/2655 = 2.45 6516.25/7500 = 0.869 = 1/1.15 |
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#26
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Re: CIM Quiz 2
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(though it's worth noting that it's closer to 3.5 times.... |
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#27
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Re: CIM Quiz 2
15600/5310 = 2.94
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#28
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Re: CIM Quiz 2
Quote:
The data I have here shows the FP max power 184W at 7800 rpm. The FP would draw slightly less current and run cooler if geared for 7800 instead of 7500. |
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#29
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Re: CIM Quiz 2
Quote:
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#30
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Re: CIM Quiz 2
... Ill advisedly.
Wow. Not sure what happened there. I'll have to check the excel sheet I made, tomorrow. Edit to add: Apparently I mis-clicked in excel, and selected the CIM motor's output power twice. Oops! Last edited by EricVanWyk : 03-12-2010 at 10:57. |
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