Waldemar Posted September 8, 2019 Share Posted September 8, 2019 Dear Onewheel-friends, i have somehow a shortcut beetwen battery and machine. I disassemled complete the Z10 to search the fealure. I suspect that the MOS board is broken, because one of the three connections to the motor has a contact to the minus pol. Can one of you tell me if this is absolutely normal or the MOS board is really broken. Maybe one of you can make the same test. Thanks! Waldemar Quote Link to comment Share on other sites More sharing options...
Rotciv Posted September 8, 2019 Share Posted September 8, 2019 Can you check the drain tab on those two low side drivers? They are STH15810, you can try replacing the failed MOSFETs if they failed. Quote Link to comment Share on other sites More sharing options...
Waldemar Posted September 9, 2019 Author Share Posted September 9, 2019 Hello Rotciv. I made a video. Quote Link to comment Share on other sites More sharing options...
Rotciv Posted September 9, 2019 Share Posted September 9, 2019 4 hours ago, Waldemar said: Hello Rotciv. I made a video. Looks like the low side left most phase failed. I would try replacing the MOSFETs, but I would be cautious with the motor. A failure like that is usually the effect of shorted motor or the leads to the motor. If you have a milliohm meter, check each phases of the motor. If you don’t have a meter, you can use a variable power supply and put a known voltage and current and measure the voltage drop. Here’s someone using a power supply to measure the winding resistance on a bldc motor: Quote Link to comment Share on other sites More sharing options...
Waldemar Posted September 10, 2019 Author Share Posted September 10, 2019 unfortunately I dont have a power supply. So i can not measure the voltage drop. I checked the resistance and the drain for each phase. It seems like the engine is ok. What do you think? Quote Link to comment Share on other sites More sharing options...
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