Chaos 1600w mosfet replacement help needed

[gmal2017]

Here are the test results so far

Main motor wires
Yellow = 9.24K
Blue = 9.23K
Green = 9.19K

Hall wires
Blue = 5.37K
Green = 5.36K
Yellow = 5.37K
Red = Not registering any resistance
Black = -0.00

 

[Deleted member 4366]

Wrong results. We need
Blue phase to red battery resistance
Green phase to red battery
yellow phase to red battery
blue phase to black battery
etc.

 

[Wildswimmer Pete]

No that was not what I said... The IR component is not in the same league as the NCE component. Were you to rip open the plastic packaging.. say crushing it in a vize , the chip for the nce component would probably be 4 times larger in area.
What's happening with the juddering is that current is going to the coils via the MOSFETs, but either one set of MOSFETs is not getting instructions to switch off and on, so the sequence is disturbed... Whether it is a controller or mosfet problem I don't know....

Please don't attempt to break open any power mosfets or similar power transistors. Many of them contain beryllium oxide which is extremely toxic. Speaking as a retired industrial electronics engineer.

 

[Danidl]

Please don't attempt to break open any power mosfets or similar power transistors. Many of them contain beryllium oxide which is extremely toxic. Speaking as a retired industrial electronics engineer.

That is true about beryllium oxide, but I don't think it is used in the TO220 or similar plastic packaging. The die is directly bonded to the rear heatsink and the plastic is moulded to keep everything in place. I think it as more widely used in the full metal can packages like the TO3

 

[Wildswimmer Pete]

That is true about beryllium oxide, but I don't think it is used in the TO220 or similar plastic packaging. The die is directly bonded to the rear heatsink and the plastic is moulded to keep everything in place. I think it as more widely used in the full metal can packages like the TO3

Some TO220 devices do use BeO2, I've come across them when servicing industrial equipment but to be fair that is in kit using high voltage/current transistors. RF devices are notorious for using BeO2. It's best to err on the safe side though.