[General] How does a brushless ESC works??

[Deexith Hasan]

How does a brushless ESC works.... how it detects the position of rotor.....

is it possible to build own ESC by PWM Duty cycle adjustment..for BRUSHLESS motor...

Why Brushless motors have # wires and what are they?

 

[BradtheRad]

A natural role for ESC is in radio controlled airplanes and boats, where the load is a fluid (air, water). The motor has an easier job maintaining unchanging speed.

how it detects the position of rotor.....

You can set a switching speed, without needing to detect the position of the rotor. You can switch energy to coils in succession, and the rotor will follow.

Of course, if the rotor does not go faster as you speed up the switching frequency, then you have discovered the limit at which your brushless motor operates.

 

[D.A.(Tony)Stewart]

https://www.google.ca/search?q=brus...3HsQSIv4HIAg&ved=0CAcQ_AUoAQ&biw=1920&bih=994

Usually, back EMF from the motor is used to detect this rotation, but variations exist that use magnetic (Hall Effect) or optical detectors.

The problem with stepper motors and BLDC motors driven at max speed is it is close to mechanical resonance.

The secret to stepping faster than this is to add rotor disc damper ( e.g. sealed brass disc in oil in plastic disc shell..) to eliminate the deadband of torque at a certain step rate.