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Old 01-10-2009, 10:43 PM   #1
Extractor
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Default 72v motor

what motor are you guys using in a 72v cart? I assume my stock motor will not work in my '98 48v series CC. EMP said they couldn't help me. I tried a search but found nothing. Any recommendations?
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Old 01-10-2009, 11:44 PM   #2
roady89
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Default Re: 72v motor

Many people run the stock series motors on 72 volts without much trouble but I wouldn't run anymore than that. EMP won't do motors over 48 volts for some reason. I'll be looking for new motor builder real soon.
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Old 01-11-2009, 12:09 AM   #3
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Default Re: 72v motor

I believe a D-380 can handle the additional volts...even higher than 72. I'll wait for Nate to chime in.
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Old 01-11-2009, 12:42 AM   #4
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Default Re: 72v motor

Its more about the RPMs you get when the extra volts are added. If a motor runs, for sake of simplicity say 4000 RPM on 36 volts......at 72 volts it will run 8000 RPM. I myself don't like to spin a motor over 8K...but thats me. A series wound motor, if left unchecked, will grenade itself. We have had better luck using a stock wound motor on 108 volts than we have with a custom wound motor because of the RPMs. The stocker spins 2800 on 36 volts, 72 volts is 5600 and 108 volts is 8400. (again, no math BS, just for simplicicty sake.) It'll live a bit longer at that level vs over 10K. All the motor problems Muathia and I have experianced have been stemmed from too much RPM......which comes from the added voltage. (96 volts and above)

Use a low rpm torque motor to build torque and use voltage to gain RPM. A beast on 72 volts is a great combo.
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Old 01-11-2009, 12:56 AM   #5
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Default Re: 72v motor

Put a gearbox in there, roady.
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Old 01-11-2009, 01:07 AM   #6
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Default Re: 72v motor

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Originally Posted by Xtreme Cartz View Post
Put a gearbox in there, roady.
The motor will still be spinnin the same rpm!
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Old 01-11-2009, 01:39 AM   #7
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Default Re: 72v motor

Yeah but just think about how much faster you will be going.
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Old 01-11-2009, 02:13 AM   #8
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Default Re: 72v motor

I need to get my motor/cart running again. I had motor rebuilt by EMP, told them I was running up to 72v and they rebuilt motor with a "banding" Hope it holds together when I have time to play.
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Old 01-11-2009, 10:10 PM   #9
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Default Re: 72v motor

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Originally Posted by roady89 View Post
Use a low rpm torque motor to build torque and use voltage to gain RPM. A beast on 72 volts is a great combo.
So what do you think would be the difference between the D395 and the D380 running at 72v? Trying to stay away from grenades!
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Old 01-11-2009, 10:25 PM   #10
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Default Re: 72v motor

D395 on 72 volts with stock tires should be around 30 MPH with an extreme amount of torque. You will need a controller to handle it of coarse. It will stay in the lower RPM range. The peak HP on 48V is a little more than the D380.

D380 will have more top end than the D395 but less torque and HP.
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