1. Can BLDC be controlled with PWM?
I ask this because brushless DC motors are electronically commutated. So in fact I'm messing up allready electronic pulses that drive originally coils.
2. If they can be controlled with PWM, which PIC to use?
PIC 16f628 has only one PWM channel and 16f876 two channels, I need 5 that have diffrent signals on it, in the same time.
3. Well I want to control all 5 motors and since I never used PWM in PIC, does PWM work in background like TMR0?
Because I want to have graphic percentage of speed of all 5 motors on LCD. Also pushbuttons need to be read for control of motors, all in the same time.
visit rcgroups.com and search there for diy bldc controller u will find a thread by a user named kreature.u will find a lot info there.
and i have seen some commercial bldc controllers which uses atmega8 which has 6 pwm channel i think
You can get pic's that are designed for motor control with 6 or 8 pwm outputs and encoder or hall sensor inputs.
Such as the pic18f4431.
and also the dsp pic range.
Check out microchip for schematics and application notes.