10-01-2013, 12:18 PM | #1 |
Gone Wild
Join Date: Jun 2012
Location: mississippi
Posts: 203
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36 or 48
Which would make more torque and speed? A 2 hp 2500 rpm motor that is labeled 36 volt but running on 48 volts or a 3.7 hp 2500 rpm motor labeled 48 volts and running on 48 volts ? I was thinking the 36 volt motor would make more than 2 hp if running it on 48 volts, am I wrong?
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10-01-2013, 12:36 PM | #2 |
Master of All Things
Join Date: May 2013
Location: West Columbia, Texas
Posts: 17,892
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Re: 36 or 48
most likely, the 36v motor running on 48v will run faster (more rpm), but the other will have more torque.....
for if you take a 36v motor and run in on 48v, you will get an increase of roughly 30% of each (torque/speed) but the 48v motor you have will still have the same speed (2500 rpm) and seeing as how its more powerful to begin with, will most likely make more torque. so the bottom line is the 36v motor will make the cart faster...... the 48v motor will make it have more torque |
10-01-2013, 01:31 PM | #3 |
Gone Wild
Join Date: Jun 2012
Location: mississippi
Posts: 203
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Re: 36 or 48
Thanks
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10-01-2013, 05:24 PM | #4 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 36 or 48
Quote:
These are sepex motors, so 2500RPM is about 1/3 of what the motors can spin at with stock height tires and gears. |
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10-01-2013, 05:33 PM | #5 |
Gone Wild
Join Date: Jun 2012
Location: mississippi
Posts: 203
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Re: 36 or 48
Stock gears with a limited slip kit and an Alltrax 400 & big cables. Only running 20" tires and eight 6 volt batteries
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10-01-2013, 05:58 PM | #6 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 36 or 48
Quote:
If the tires are high floatation type (low pressure), it might be a little more. Mathematically, you can get about 36MPH @ 7500RPM, but I'd keep it down to 6500RPM 31MPH). |
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10-01-2013, 06:21 PM | #7 |
Gone Wild
Join Date: Jun 2012
Location: mississippi
Posts: 203
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Re: 36 or 48
It will go about 27 mph now with the 36 volt motor. I do notice the motor getting a little hot after some long runs or hills. I wonder if the extra torque from the 48 volt motor will help it run cooler?
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10-01-2013, 07:11 PM | #8 |
Master of All Things
Join Date: May 2013
Location: West Columbia, Texas
Posts: 17,892
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Re: 36 or 48
well he never said he was talking SEPEX motors........that's a horse of a different color!
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10-01-2013, 07:45 PM | #9 |
Gone Wild
Join Date: Jun 2012
Location: mississippi
Posts: 203
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Re: 36 or 48
Yea, it's a PDS cart. Since I'm not using the speed sensor on the motor do I need to even install it in my new motor? Should I put it in just to keep dirt and water out?
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10-02-2013, 07:46 AM | #10 | ||
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: 36 or 48
Quote:
The case temp for motors with Class H insulation on the windings, should stay below about 115°C (239°F), which is above the boiling point of water and too hot to touch. When Amps pass through a motor, the electrical energy they carry is converted to either motion or heat and if the RPM the motor is spinning at is less than what is dictated by the voltage applied, more of the energy is being converted to heat. More torque means more amps are passing through the motor at a given RPM and more amps means more heat, but more torque also means the motor will spin faster with the same mechanical drag, so it will be more efficient and generate less heat. Without a complete Torque vs Amps vs Volts curve for each motor and the mechanical drag numbers for your cart, it is only a guess, but my guess is that both motors will run at about the same temperatures since there really isn't all that much difference between them. Quote:
I haven't done it yet, but I'm kicking around the idea to use it to feed a tachometer. It puts out 8 pulses every time the motor shaft makes a complete revolution. |
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