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Controller running hot? What is considered normal temprature

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Pontus:
Thank your for pointing that out Alan, that's much appreciated!

I'm currently using a 3-bladed 14" X 10" which gives a rpm about 1300 for our boat, so somewhere between 1:2,7 to 1:2,5 seems to be a good ratio.

Bikemad:
You might find this pulley/belt calculator useful but it looks like it may be more suitable for "V" belts than toothed belts.

This calculator seems better suited to toothed belts but I suspect your setup will require heavier duty pulleys than a robot uses.

A YouTube video showing most of the different toothed belt attributes can be found here.

Hopefully, some of this will be helpful.

Alan

Pontus:
So, this winter's project is done! I rebuilt the transmission, adding a tooth-belt-drive reduction of  2,78 : 1. I also replaced the VEC-500 for the newer EZ kontrol  (B48-1000). The new controller adds internal coolant channels and a slight increase in rpm for max power.

During my contacts with GM I asked the following about wokring temperatures.


--- Quote ---What's the recommended temperature range for controller and motor?
Booth motor and controller will be cooled with circulating water but to avoid unnecessary noise I would like to start the cooling fan only at a certain temp.
--- End quote ---

And got this in reply


--- Quote ---As for our 10KW BLDC motor,it shouldn't get proper cooling before 120°C. And the EZ Controllers will limit the current around 70°C and shut off around 90°C.
--- End quote ---

I can happily report that the controller now runs really cool, even though neither motor nor controller is connected to the coolant loop yet. I'm still waiting for some pluming parts, all parts are only lukewarm.

The entire build process and testing is documented at the boat's blog at https://grinde-19.se in Swedish, and translated by google to English here.

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