Quote:
Originally Posted by Jon Stratis
I've got a question for the brilliant minds here at CD... How much current is too much for a 550 when running it at full speed (not stalling) for 2+ minutes? In other words, any idea what the limit is before you burn out the motor?
On our shooter, each 550 is drawing about 7A when the shooter is at full speed (and 8-9A when it's spinning up the flywheel to get to full speed).
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First, a point of clarification: if it's drawing 7 amps, it's not running at "full speed". I think you meant "full voltage applied". It's running at 93.3% of full speed. That's faster then the max efficiency point and generating less waste heat (watts_in minus watts_out). So at that speed, the motor should be able to run continuously,
assuming it is vented properly!
Read this:
http://www.chiefdelphi.com/forums/sh...72&postcount=5
Code:
Motor Calculator build MCALC32ab 1/19/2012 610pm
M5-RS550-12 (-B) @ 12.00 volts:
@ free (no load):
oz-in Nm rpm rpm% amps watts out watts in eff%
0.0 0.000 19300 100.0 1.4 0.0 16.8 0.0
@ stall:
oz-in Nm rpm rpm% amps watts out watts in eff%
70.5 0.498 0 0.0 85.0 0.0 1020.0 0.0
@ max power:
oz-in Nm rpm rpm% amps watts out watts in eff%
35.3 0.249 9650 50.0 43.2 251.5 518.4 48.5
@ max efficiency:
oz-in Nm rpm rpm% amps watts out watts in eff%
8.0 0.057 17105 88.6 10.9 101.4 130.9 77.5
Select input:
1)oz-in 7)watts_in 3)rpm 5)amps 8)eff%
2)Nm 6)watts_out 4)rpm% 9)volts a)rpm&ozin 5
enter amps: 7
M5-RS550-12 (-B) @ 12.00 volts:
oz-in Nm rpm rpm% amps watts out watts in eff%
4.7 0.033 18007 93.3 7.0 62.9 84.0 74.9