need help to drive a bldc

[dawar]

bldc basics+microchip

hello ! every one , can anybody help me in following problems ( pleeease )

how should i drive a bldc motor ( sensorless) ? how to sense its back emf ? how to varry its speed ? ........... ?

i know that ESC is one solution , but i dont know what are inputs to ESC (except those battery connections).

please guide me through these problems , and if possible please send circuit diagrams ( dawar09@yahoo.com ) DESPERATELY WAITING !

 

[alexplace2001]

Hi

I will recomend you these app notes, they cover the basics of BLDC:
https://ww1.microchip.com/downloads/en/AppNotes/00857a.pdf
https://ww1.microchip.com/downloads/en/AppNotes/00885a.pdf

It will also help to know:

what is the motor voltage rating?
what do you want to move (application)?
what do yo want to control (position, speed, torque)?

What is ESC?

Alex

 

[dawar]

thanx alexplace2001!
i have seen those notes , they were quiet informative but couldnt solve my problem.

well! from another forum i came to know that the esc(electronic speed controllers)
needs pwm signals as input. it takes a pwm sgnal of 20ms having a positive pulse of 1ms(min speed) to 2ms(max speed). but still i m facing some problems in implementing this knowledge,

 

[khloud12]

I need the same help
I use Brushless DC motor(2208\20) and jeti advance 18 pro (ESC)
But, I don't know the input signal to this controller

I try to make servo circuits that generate PWM (50HZ +5%:10%)
the motor work but not max speed

Please, help me by the shape of signal input to this controller or how this work?