Position Tracking Controlling System of Position Sensorless BLDCM by Using SMC

This paper is mainly about position sensorless BLDCM tracking controlling system, which substitutes the traditional position sensorless BLDC controlling system. By the virtue of overcoming the disturbance of hall which causes the wrong actions of the controlling circuit, this method improves the stability of the whole system. In addition, as it is difficult to build the mathematical model of the system for the unbalance distribution of the rotator and magnet field, the effect of slot and parameter uncertainness. Sliding model control has the characteristic of good robustness and self-adapting, which is especially suitable for position sensorless BLDC controlling system. This paper provides a new method to track the back electromotive force of every phase, simulation proves to gain good result and is feasible