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05-17-2010, 11:32 AM | #11 | |
Gone Wild
Join Date: Nov 2008
Location: Montgomery, AL
Posts: 1,463
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Re: i think i know but will ask any way
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05-17-2010, 12:33 PM | #12 |
Getting Wild
Join Date: Mar 2010
Location: bardstown ky
Posts: 116
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Re: i think i know but will ask any way
bought the cart 2nd hand. have no idea how old the batterys are. Do know they are trojan t105 mile makers. wires are stock i assume
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05-17-2010, 01:53 PM | #13 |
Gone Wild
Join Date: Nov 2008
Location: Montgomery, AL
Posts: 1,463
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Re: i think i know but will ask any way
look on negative post. you should see a letter and number. number is year of batts. ex: b5 is feb of 05.
If they are orig to cart meaning they are 05 batts, than you are more than likely due a set. I would replace batts and upgrade to 4 ga wires. that will get you up those hills. Dont change just the battery wires to 4 ga, change all of them, contoller to motor, solenoid to controller, battery to f-n-r switch, etc. |
05-17-2010, 09:10 PM | #14 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: i think i know but will ask any way
D&D gave a rating on one of their series wound golf cart motors of 4.8 HP @ 36 volts and 6.1 HP @ 48 Volt. If there is an increase in HP there has to be an increase in torque. HP is derived from torque. You can't gain 1 without the other.
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05-18-2010, 02:24 PM | #15 | |
Gone Wild
Join Date: Oct 2009
Posts: 486
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Re: i think i know but will ask any way
Quote:
In a series wound DC motor torque is derived from current, which is limited by the controller. Simply going from 36 to 48 volts will not increase torque without changing out at least the controller. To increase torque in a series wound DC motor you have to supply more current, so if you leave say a stock 200 amp controller in the cart, 200 amps of current is all the controller can supply at locked rotor. No amount of voltage you push is gong to change what the controller can supply. It is very basic Series Wound DC Motor physics. In a Series wound DC motor torque is directly proportional to current, and RPM is directly proportional to voltage. So if you look at the power curve of any series wound motor max horse power is at half the rated voltage. At full voltage and RPM torque = 0 and HP = 0. Maximum torque in a series wound motor occurs at 0 RPM, and linearly decreases as RPM and voltage go up until it reaches 0 pounds of torque. 0 pounds of Torque x any RPM = 0 HP See the graph of any series wound motor and it is as plain as day. |
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05-18-2010, 02:59 PM | #16 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: i think i know but will ask any way
As with many of your posts it seems you simply want to start an arguement. You didn't prove anything but that. Theres no need to overcomplicate things when it was a simple question. The FACT is when you add voltage you gain power and speed across the board. When you increase HP you also increase torque. No if, ands or buts.
Hows this chart for ya? When using the conversion chart, place a straight edge along the two known quantities and read the unknown quantity on the third line. As you can PLAINY see when you increase HP torque increases to. Even is you just raise RPM (by adding voltage!) torque increases. (this chart has torque values too...wooo) This chart is specifically for electric motors, not gasoline. Is there any reason to continue this conversation? Unless you have some kind of compelling evidence to change the minds of the indusrty and thousands of carters who have made the conversion I see no reason to......especially since you have never done the conversion. |
05-18-2010, 04:48 PM | #17 |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
Posts: 24,284
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Re: i think i know but will ask any way
Nice chart. WTF is a Green Maxon Motor, what good is a motor that only makes 600 rpm in a golf cart, and how many carts have you built up? Have you ever dyno'd a golf cart, or do you just use your charts?
Roady, I can't see your chart. |
05-18-2010, 04:55 PM | #18 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: i think i know but will ask any way
Fixed. Hit F5 gorno.
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05-18-2010, 05:01 PM | #19 |
nimda
Join Date: Jun 2007
Posts: 13,022
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Re: i think i know but will ask any way
A permanent magnet motor.....which is useless in a golf cart and is irrelevant to this conversation. A permanent magnet motor has a fixed feild. (feild magnets that do not increase in strength with voltage or amperage.....)
It doesn't matter how you look at it, twist it or what chart you throw at it, when you add more volts you produce more power which is why thousands of people do this conversion. Hills you previously couldn't climb now you can as well as many other things. I can't think of one person who has ever done it and wasn't happy with the increase in power. Theres no reason to overcomplicate things. |
05-18-2010, 05:29 PM | #20 |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
Posts: 24,284
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Re: i think i know but will ask any way
My slot cars had permanent magnet motors! LMAO!
How does that turd taste, sunking? |