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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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09-28-2018, 06:13 AM | #21 | |
Gone Wild
Join Date: Jul 2017
Location: East Central Missouri
Posts: 1,955
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Re: Active Motor Cooling
Quote:
This is the fan I installed. For $30 you would get 240 cfm. Just one exhausts all the heat from a VC625 engine. GDSTIME 12v 120mm x 38mm High Speed Dc Brushless Cooling Fan https://www.amazon.com/dp/B00N1Y4QOI..._o1GRBbSZA2FAT |
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09-28-2018, 06:25 AM | #22 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Active Motor Cooling
Just another idea, but a bilge inline blower would provide more flexibility in both the mounting and the use of ducts to easily position both air intake and air blower location.
You can get them in different sizes and CFM rating, here is an example: https://www.amazon.com/Marine-Electr.../dp/B00F7ANK7S |
09-28-2018, 07:01 AM | #23 |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Active Motor Cooling
I would have jumped at the EMP motor idea a while ago actually, but they don't make one that's sepex. Only series.
The tires may have to happen. $10 each or 4 for $25, rims and tires, used 'decent' stock tires... It'll look goofy, but I will have to make that part of the design... Hmm. I did remember some CPU coolers I have in the garage. Big copper things with heat pipes. They look a lot like this one except mine are a little larger and all copper: https://www.dhgate.com/product/lga-2...386943276.html This is for the Intel Core I-7 CPU and that CPU family runs from 90 to 210 watts IIRC. 2 or 3 of these may be the ticket! If I have 600 watts of heat waste and 3 of these can handle 300 watts of heat (assuming for added inefficiencies of Golf Cart usage vs computer usage)... I'm thinking of mounting them to the same bolts that ScottyB did for his heat sensor probe. Drill right through the center to make a bolt hole. I need to verify I can do so without hitting a heat pipe, otherwise I need to devise some other method. |
09-28-2018, 09:03 AM | #24 | |
Gone Wild
Join Date: Oct 2014
Posts: 353
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Re: Active Motor Cooling
Quote:
That way you could add a bunch all the way around the motor. I think you will need much larger heat sinks than CPU ones though. Or wrap a copper pipe around the motor with another coil in a cooler full of salted ice water, and pump cold water around the motor. Just place the cooler in the bag well. |
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12-22-2019, 01:09 PM | #25 |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Active Motor Cooling
Well, we had our 2019 parade last night and I figured I'd really need better cooling as they changed the parade route and made it MUCH longer.
I purchased 4 of these 12v fans: https://www.bgmicro.com/fan-axial-40...l-bearing.aspx I wired them in series and mounted them to a thin piece of metal and aimed them at the motor blowing from the top down. I did over-volt them a little but not much. They are 12V rated and at the start of the parade I think I was giving them 14.25 to 14.5v each, no issue. I connected them to the battery pack with a 7.5amp fuse as my safety and my switch. Then I went almost half the parade route before I remembered I needed to turn them on... But I put the fuse in, fans came to life and I finished the parade. When I got home the motor was hot but not hot enough that you had to let go, I could keep my hand on it even though it was uncomfortable. So that's much better than last year. Also, I did initially start with wiring the 75 degree centigrade and 95 degree switches, but the 95 degree switch was sounding my buzzer when the motor was cool to the touch... 95C is 203F, so I knew these switches couldn't be trusted and opted to go simple. |
12-22-2019, 05:09 PM | #26 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Active Motor Cooling
Glad to hear you pretty much got the motor heat vs parade speeds conquered. Next year, start the fans when you start the parade and the motor will be even cooler. That way you'll be dissipating more heat from the onset, so the heat buildup will be slower, which in turn reduces the final motor temperature. The amp draw will be from about 640mA to 960mA for the four of them, so it shouldn't affect the range much. BTE: the voltage range for the fans linked to is 4.5V to 13.2V, so you did over-volt the a little. Here is the spec sheet on the fan linked to. |
12-23-2019, 12:47 PM | #27 |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Active Motor Cooling
Trying to post pics from my phone...
The first pick is from the ground aimed upwards so you can see the motor and the diagonal array of fans. The second pick is from the lithium battery pack aimed backwards and you can just barely make out the fans above the motor, they are probably 10 inches above the motor with a couple inches of space behind them. I did set up the 5 amp charger from the generator to the battery pack at the start of the parade. So, yes, I was running a hybrid gas/electric car. But I figure these fans would draw a miniscule current that would be more than offset by the charger and thanks to Johnnie's math I see they do indeed only pull a collective 1 amp. |
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