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[EcoDrift.ru] Gotway MCM5, MSX, Tesla Comparison (Motors & Controllers)

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Thanks for posting this.

The MCM5 is a special wheel. And I know very few people take it up the kind of hills that I have, but I can tell everyone that the MCM5 is the most amazing steep hill climbing wheel ever made.

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I looked to control board for Tesla, it has just one fan, it is safe? I saw that the previous version had two fans on the backside.

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They released in 2018 a version very slightly improved with a new motherboard and adds a fan and increases the surface of the heat sink. In addition, with the new motherboard there are new modes for LEDs. 

https://fr.aliexpress.com/store/product/New-GotWay-Tesla-electric-unicycle-CPU-control-board-replacement-mainboard-84V-67-2V-EUC-mainboard-upgrade/3896031_32879870523.html

 

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On 3/4/2019 at 11:39 AM, ElectriQ User said:

I looked to control board for Tesla, it has just one fan, it is safe? I saw that the previous version had two fans on the backside.

I'd claim that the package-size / amount of power transistors and size / surface area (/ weight / heat capacity) of the heatsink are more important. Ideally, no fans would be needed at all (and many wheels don't have any), as they add a new failure point (mechanical moving parts) vs. plain passive cooling.

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27 minutes ago, KingOsmos said:

Why does the MCM5 board have 4 capacitors and the Tesla has just 2? Any ideas?

My guess would be space issues, board size and how much room is there in the mainboard compartment. The MCM5 board has four 470uF caps in parallel = 1880uF (well, those caps have a tolerance of something like +-20%, but thereabouts ;)), while the Tesla board has two 1000uF caps = 2000uF. More caps in parallel does drop the ESR (resistance) of the caps , so theoretically more smaller caps in parallel could provide higher amperage, but since no-one's complaining that the wheels don't have enough power, it likely isn't that much of an issue either way :P   

AFAIK, the caps are there to provide the high current spikes when the motor coils are being turned on, the momentary (nano/microseconds) amperage can hit very high numbers (100's of A, if not 1000), which couldn't be provided "all the way" from the batteries, because of resistances added by all the wiring and connectors in-between. Also they'll likely take the worst voltage spikes off coming back from the motor(?). Usual symptom of a failed / bad caps in the mainboard is loss of torque (if not outright failure of the board, if they fail in short circuit for example).

Edited by esaj
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