03-22-2022, 06:24 PM | #91 |
Not Yet Wild
Join Date: Mar 2022
Posts: 24
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Re: 2021 icon i40 with Roy pow lithium battery locks up
Reading through this thread has made me a little nervous to drive my cart. In my opinion, even those of us who haven't done a lithium upgrade are at risk (admittedly smaller though) because a BMS event isn't the only thing that could cause power to get cut to the EMB.
- The relay that controls the EMB could fail - Wire insulation could get rubbed through over time and cause a short - The insulation on the coil of magnet wire inside the EMB itself will eventually fail - The factory fuse between the battery and the controller that could blow - A passenger could turn the key to off (intentionally or unintentionally) while the cart is moving I could go on. It think a better approach to mitigating the risk of an unintended lock up is to look at modifying or replacing the EMB itself with one that clamps with less force, so that it has a braking effect but does not lock up solid. Maybe replacing the springs inside with weaker ones, or partially tightening the release screws so that the friction plate cannot move completely against the disc? That way if/when one of the above happens, it's not catastrophic. Locked up rear wheels at high speed are very dangerous because they will always cause the vehicle to rotate. Skidding wheels want to lead. The electric EZGO RXVs also use a motor brake. Does anyone know if similar accidents have happened with them? I wonder if there's something about their design that prevents something like this from happening. |
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05-02-2022, 04:02 PM | #92 | |
Gone Wild
Join Date: Jan 2015
Location: Seminole Country
Posts: 836
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Re: 2021 icon i40 with Roy pow lithium battery locks up
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05-02-2022, 05:27 PM | #93 |
Not Yet Wild
Join Date: May 2021
Posts: 20
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Re: 2021 icon i40 with Roy pow lithium battery locks up
Also curious on the status of this. The thread is very interesting. I have a lithium battery pack and experienced my first BMS power loss trip. I was driving with 4 people in the cart going up a hill around 27mph, battery was around 50%, it was a hot day and cart was baking in sun for hours. I suspect the BMS tripped due to heat, either way it tripped. Once the cart BMS tripped the entire cart lost power obviously, the electric brake instantly engaged and locked up the rear tires as I can screeching to a stop. The magnetic brake held very strong and did not break.
I now am very interested in adding a “UPS” for the EMB. |
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