Sensorless brushless dc motor control - fly-wheel diode

(1) it requires that the inverter has to work in the power device take turns up and down in the way of PWM chopper, control is 3 phase induction motor difficult (2) it must be removed from the two aspects of hardware and software diode stream invalid signal conduction and the number of misleading communication due to burr interference (3) there are big error, this method also when K e very small or rotational speed is low, V, CE, V F compared wholesalemotor.blogspot.com to counter potential is not negligible, due to ignore the error due and certain phase compensation measures. fan cover Because of the above shortcomings and the insufficiency, this method is not widely used in domestic now.