12-20-2006, 01:03 PM | #11 |
Gone Wild
Join Date: Dec 2006
Posts: 679
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Motors are funny devices; they are more current sensitive than voltage sensitive. The D-380 I have from PQ is basically a 48V motor but I have it on 120V and it performs extremely well. The biggest issue with high voltage on a 48V motor is RPM. I know my max speed based on gear and tire size; this tells me when to stop applying power because the motor is at max RPM.
The exploded PQ motor you saw was a high speed motor running on 72V, no problem other than the owner did not monitor speed and ran the motor above its RPM limit. I am guessing it was well over 8000 RPM before it came apart. EMP is afraid to say they can build a motor for 120V because the over-RPM issue is too great. There are no guide lines to follow for a golf cart on 120V. D&D said the same thing as EMP when I asked them about 120V motor about a year ago. PQ said the motor was good to 8000 RPM, do not exceed and ran it on their dyno which is why I went with their motor, I knew the true limit of that particular motor. I know I sound pro-PQ but they were the only ones who were interested and made recommendations when I told them I was going 120V. I can bore you folks about motor characteristics some more if you like. |
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12-20-2006, 01:31 PM | #12 | |
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You bring up a good point about motor RPM. The boost cart we are playing with I'm thinking the motor is turning 9000 rpm at the speeds we are running.(Just a guess) We are just waiting on it to explode! LOL! |
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12-20-2006, 02:30 PM | #13 | |
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12-20-2006, 03:35 PM | #14 |
Ford
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50 MPH for 4 miles sound REALLY good to me.
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12-20-2006, 04:11 PM | #15 | |
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12-20-2006, 06:58 PM | #16 |
Gone Wild
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That same cart with 120V worth of group 24 batteries and an HT motor also ran 50 MPH and had the capacity to run about 15 miles but the motor would get too hot after 4 miles. 100 degrees C (212F) on the case is my shut off limit.
9000 RPM! Hang on when that puppy lets go! (or the moose wearing a diaper and wig!) I am working on a rev limiter that cuts power by 50% to an electric motor when a certain RPM is reached. It would be for controllers carts so the bypass circuit would bypass the limiter but it could possibly drop out the boost at a certain RPM. |
12-20-2006, 08:02 PM | #17 | |
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12-21-2006, 05:42 PM | #18 |
Gone Wild
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Unless it has been changed or is older than 1980 I would guess 12.44:1.
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12-21-2006, 05:47 PM | #19 | |
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12-21-2006, 05:49 PM | #20 |
Gone Wild
Join Date: Dec 2006
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If you can see the armature count the armature turns to one tire rotation, it should be just shy of 12 1/2 armature turns to one tire rotation. If you open it you can count your teeth...
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