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How do i check my brushless speed controller max Amp?
I have a brushless motor from an old VHS-Player rotating video-head drum, the speed controller attached to it is perfect for me because i only need to turn it on and off. So, i want to rewind the motor but i don't know the max amps the circuit can handle without burning, is there any way of finding this out? (i have no manual)
I don't know if this has anything to do, but just in case:
it is a sensored controller (it's got 3 hall sensors)
You have an interesting problem because the motor will exhibit what is known as "counter EMF" which the controller might take into account as part of it's control function. Easiest way that I know of is to measure the output voltage in a no load, open circuit condition. Next, using 1 or 2 watt resistors, starting at at least 150 ohms, slowly decrease the resistances, while tracking the voltage across the resistance. When you reach a point where the voltage begins to fall, you have reached the current capability of the controller. I would then use the next value resistor up from that point, figure out the current flow based on voltage and resistance, and not put a load on the controller greater than that. To be safe, de-rate the current that you find by at least 10% and do not exceed it.
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