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Old 10-27-2010, 07:16 PM   #1
oletop
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Default RPM vs Max Safe RPM

I am starting to rebuild a 1995 Medalist Electric. Themotor says RPM 2800 and it also says Max Safe RPM 8000. Can someone explaint o me what this means? Also can anyone tell me what the stock gears are in the rear end of this cart. It is a series cart. I would like to use the speed calculator but do not know what gears I have.

Thanks,
David J.
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Old 10-27-2010, 07:47 PM   #2
pggroves
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Default Re: RPM vs Max Safe RPM

RPM at designed voltage = 2800
Max RPM = 8k before you damage it.

12.44:1 on the ratio.
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Old 10-27-2010, 08:04 PM   #3
oletop
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Default Re: RPM vs Max Safe RPM

So the motor will turn up to 2800 rpm from the accelerator pedal being depressed all the way. The 8000 could come from descending a hill I suppose. Does this sound correct?
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Old 10-27-2010, 08:43 PM   #4
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Default Re: RPM vs Max Safe RPM

Yes, down hill or increased voltage.... I believe 48v will spin it at 4200 rpms.
I hear it turns into a hand grenade at 10,000 rpms.

Somebody please correct me if my math is wrong.
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Old 10-27-2010, 09:38 PM   #5
redriderno22
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Default Re: RPM vs Max Safe RPM

yup...boom.... more like throwing a bucket of bolts into a running blender...
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Old 10-27-2010, 10:12 PM   #6
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Default Re: RPM vs Max Safe RPM

Put 72 volts in it and it will do 8000 rpm. Don't try it though.
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Old 10-27-2010, 10:36 PM   #7
FireJCT
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Default Re: RPM vs Max Safe RPM

not trying to hi-jack this...is there any way to install a tach to see what you're turning?
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Old 10-27-2010, 10:44 PM   #8
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Default Re: RPM vs Max Safe RPM

Haven't seen a tach for a sparky, yet.
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Old 10-27-2010, 11:19 PM   #9
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Default Re: RPM vs Max Safe RPM

Isn't that what a speed sensor on a sepex motor is doing?
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Old 10-28-2010, 07:57 AM   #10
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Default Re: RPM vs Max Safe RPM

Quote:
Originally Posted by scottyb View Post
Isn't that what a speed sensor on a sepex motor is doing?
Perhaps, but it could also be reading back-voltage off the motor in some fashion.
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