Saturday, 12 March 2016

mosfet - BLDC Current Driver Encountering Current Problems


The attached Schematic uses 6 N Channel Power Mosfets "IRL3303". I have wound my inrunner bldc motor with 180 windings per phase using a 26 Gauge Magnetic Wire. My motor is a 6 pole 2 magnets machine. The encountered problem is defined below.


3 Phase Current Driver Schematic


Q. The mosfet being used has a Vgs Threshold as 1V. Arduino outputs are being used to power the mosfets(state-machine). Even at 15V VCC the drawn current by the motor is around 0.6AMPS. I have checked the winding connections seperately and it draws 2Amps at around 3-4V. My resistance per phase is around 5ohm and inductance 1.5mH. I have no clue how to fix it. Your input would be really appreciated. Thanks




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