Next step was to add a FAN7388 3-phase MOSFET driver chip - very straightforward device, capable of driving up to 600V inverter apparently, 12V didn't seem to stress it. So I got open-loop control working - but of course without closed-loop control the motor would stall at the slightest provocation. I started with a 3-phase bridge made from 6 IRLR3717's (n-channel, 20V, 0.004ohm) and experimented with a RC motor driven at about 1V (so all the MOSFETs could be driven from logic levels). The ultimate aim is to use one Prop to control 4 motors, though the current scheme uses 9 pins to control one motor (and doesn't have over-current detect yet).Īnyway here's a video before I get to the boring details: Partly motivated by wanting to be able to tune the response of the controller for multi-copter use, partly for the challenge. I've been working for a few weeks now on the idea of a homebrew (and open-source) BLDC (brushless motor) controller for sensorless motors (no hall sensors, as used in RC planes/copters).
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