72V 1500W Controller issue

[arsen]

Hey Guys, I have bought 72V 1500W kit for aliexpress
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I drove the bike for around 10 minutes.
I was on a straight road, the controller was cool, i stopped for a second then when i spinned the throttle the controller short circuited, after that the battery fuse blow off.
I tested for continuity issues and i find two problems with the yellow and green phase wires.
few mosfets were blown inside the controller.
I extracted and soldered a new mosfets. after that the short circuit disappear.
I wired the controller i turned on, but at the moment i spin the throttle it short circuits.
a video:

update: the tick sound is from the charger relay.
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I have no idea what is the issue, i hope that you can help me with your experience, thanks in advance.

 

[harryS]

Something is popping your drive transistors. When you had the second short circuit, were the motor phases connected to the controller? Look for the cause of the short circuit before you put in a third MOSFET.

You could have a phase wire melted to another one outside the motor, crating a short circuit. You could have a wiring short circuit inside the motor.

If the motor is good, but the phase wires are melted together, it will not turn easily. In effect, you are doing regenerative braking if two phase wires short circuit.

Otherwise, you probably need a motor tester to check the motor. I doubt that a continuity check on the phases tells much. The resistance is only a few ohms.

 

[arsen]

Something is popping your drive transistors. When you had the second short circuit, were the motor phases connected to the controller? Look for the cause of the short circuit before you put in a third MOSFET.

You could have a phase wire melted to another one outside the motor, crating a short circuit. You could have a wiring short circuit inside the motor.

If the motor is good, but the phase wires are melted together, it will not turn easily. In effect, you are doing regenerative braking if two phase wires short circuit.

Otherwise, you probably need a motor tester to check the motor. I doubt that a continuity check on the phases tells much. The resistance is only a few ohms.

Yes it was connected to the motor, I don't have much of experience i tried to find what causes the short circuit but without a succes.
I don't think there is an issue with the motor it spins freely, I'll have a motor tester probably ill upload a new video soon.

 

[arsen]

Motor test

 

[arsen]

update: the short circuit only occurs at the green phase side now

 

[harryS]

If the motor tester says no shorts, and any extender cable is good, then you must have a short circuit in the printed circuit board, which means you need a new controller

 

[arsen]

If the motor tester says no shorts, and any extender cable is good, then you must have a short circuit in the printed circuit board, which means you need a new controller

this is the whole issue, I am trying to avoid getting new one, because i am almost certain this issue will occur with the new controller too, I am trying to identify the cause.