Sensorless control of the brushless DC motors based on TMS320F2812
A new sensorless control strategy for the brushless DC(BLDC) motors is proposed in this paper. The technique builds a rotor position related flux function, which is independent of the speed. By observing the flux function, the information of rotor position and commutation can be obtained. Because the function is not speed related, this sensorless control process can be used in a wider range of speed and improve the motor startup performance. Then an experimental test bed that includes a 1.2kw BLDC motor, drivers and a TMS320F2812DSP controller is built. At the starting process of the motor, the controller adopts a strategy that combines pre position method and frequency, voltage boost method. After startup, the G function gives the commutation signal. The experimental result indicates, the proposed control strategy can make the motor achieve a smooth starting up and stable phase commutation.
2013 International Conference on Electrical Machines and Systems (ICEMS)