Originally Posted by arvidb They call them AC servos in the manual, and write "Control Method: PWM (sine wave driven)".
How do you define cogging?
Just trying to understand cogging, not sure I've got it right.
Arvid |
Although there are a few forms of PWM, a common one is PWM with variable frequency-variable amplitude and although the voltage wave form looks square the resultant current in the winding (inductance) takes on a sine wave appearance.
These are closer to true Sinusoidal than 6 step trapezoidal BLDC.
Cogging may not be the right term to use, but at low speed a BLDC rotates in coarse steps, much like a stepper, but more so. A sinewave driven should not.
Al