Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17 Slide 18 Slide 19 Slide 20 Slide 21 Slide 22 Product List
dc-motor-driver-slide7

Operation for the BLDC motor involves creation of a rotating magnetic field by alternately switching the coils on and off. The physical coils located in the stator actually do not rotate. The permanent magnets in the rotor simply follow the rotating magnetic fields. A typical BLDC motor has six angular positions for the rotor that are monitored by the controller. The positions are 60° apart and require different states for each of the three half bridge configurations. In state one, the PWM state is used to control the average voltage applied to the motor. State two is called the low state, where the low-side bridge FET is constantly on. In the high impedance or Hi-Z state, state three, both bridge FETs are off.

PTM Published on: 2015-10-08