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05-05-2014, 02:52 PM | #1 |
Getting Wild
Join Date: Oct 2013
Location: High Point, NC
Posts: 112
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Driving habits
With a modified cart, what's the best (for controller, motor, ect....) way to drive? Wide open? Easy? Normal? What generates the most heat? I guess heat probes on the motor and controller would be the best way to tell. Any thoughts?
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05-05-2014, 02:57 PM | #2 |
Gone Wild
Join Date: Dec 2013
Location: Athens, Alabama
Posts: 758
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Re: Driving habits
I would say just normal driving is best. The worst, at least on mine, is going slow in the campground with 4 people on board. My original controller went into thermal shutdown in that situation. That's what started me on the "upgrade trail"
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05-05-2014, 03:04 PM | #3 |
Happy Carting
Join Date: Dec 2007
Location: Southern California
Posts: 73,358
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Re: Driving habits
True enough. Low speed generates more heat because the load is highest on the motor at constant low speed. Creeping around (driving slower than you can walk) should be avoided.
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05-05-2014, 03:12 PM | #4 |
Getting Wild
Join Date: Oct 2013
Location: High Point, NC
Posts: 112
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Re: Driving habits
What are normal Temps for the motor and controller?
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05-05-2014, 04:36 PM | #5 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Driving habits
Normal temperature rise varies with terrain and other factors, such as tall tires and weight being carried.
The maximum case temperature for a motor with Class-H insulation is 239°F. As previously mentioned, going slow typically generates more motor heat. Other things that heat up the motor are hard acceleration from a standstill and climbing steep hills. Basically, a stalled motor can draw all the amps the batteries can provide and the controller will allow. However as the RPM increase, the motor is no longer capable of drawing as many amps. The higher the RPM, the fewer amps it is able to draw. The heat comes from the fact that all the amps drawn that are not converted into torque, are converted to heat. Since the motor can draw more amps at lower RPM, the potential for generating heat is higher. How hot a controller gets more or less tracks how many amps pass through it. Alltrax does not publish the voltage drop per 100A for SPM controllers, but for both AXE and DCX 500A controllers it is 0.09V per 100A so it is probably about the same for s 500A SPM, and that is where a lot of controller heat rise comes from. ------------ I live in hilly terrain and I have gotten my motors in the 220°F range as measured with a thermocouple attached to the case, but the controllers stay cool enough to touch. |
05-05-2014, 06:48 PM | #6 | |
Getting Wild
Join Date: Oct 2013
Location: High Point, NC
Posts: 112
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Re: Driving habits
Quote:
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05-05-2014, 08:25 PM | #7 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Driving habits
Just pour some beer on the motor and if it sizzles, you getting into the danger zone. Dunno the boiling point of beer, but water is 100°C and the wire insulation is usually good to 180°C. However, the internal temp is usually hotter than the motor case, as it can't dissipate the heat as fast as it's generated, and most buggy motors aren't fan cooled.
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05-05-2014, 08:31 PM | #8 | |
Getting Wild
Join Date: Oct 2013
Location: High Point, NC
Posts: 112
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Re: Driving habits
Quote:
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05-05-2014, 08:36 PM | #9 |
Getting Wild
Join Date: Oct 2013
Location: High Point, NC
Posts: 112
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Re: Driving habits
That makes me wonder if a 12 volt fan running off of the auxiliary battery pointed on the motor would be worth it?
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05-05-2014, 08:50 PM | #10 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Driving habits
I thought about placing a rag around mine and placing an ice holder on top. If you got beer, you prolly got ice.
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