bldc motor control_doubts

[carolineannsam]

I am doing a project on 3 phase bldc motor (24V,1.5 A)control using pic18F4431.Power circuit is implemented using driver IC IR2110 and 3 phase inverter with a total of six MOSFETs (IRFz44N) .BLDC motor works with three hall sensor feedbacks...For a particular sequence (for eg.001) one top switch and one bottom switch should be ON..Then only, a particular winding of the motor(for eg phase ab)will be energised and the rotor will move.The problem is that i m getting only LO output of the driver IC .So the rotor is just shivering...and it is not rotating... can any1 help me?

 

[MikeMl]

Post a schematic

 

[picbits]

Check your high side driver - scope out the input vs output and make sure its trying to trigger the high side MOSFET.

Make sure you're using the recommended boostrap diode (usually a fast Schottky) and Vboot capacitor - if you've not used the right components for these, you'll not get a good enough drive voltage for the high side of the bridge.