直流无刷电机光伏水泵系统控制研究

　　直流无刷电机光伏水泵系统控制研究
　　This paper analyses the realization of "neutral simulator", then use circuit tomeasure the "across the zero point". This paper also thinks over how to use the circuit inhigh voltage sensorless Bldc motor, use the circuit to realize the precision changing ofcoil.The Photovoltaic pumps SYstem select the sensorless Bldc motor to drive the pump.We also select the microchip PIC16F877 Cast Alnico Magnet made by MicroChip Co.Ltd as a control chip torealize micro-computer control. This system use three separate channel to find out the"across the zero point" of each back-EMF. The program use digital filter to wipe off thePWM interferences and the commutating interferences. In this paper we discuss how torealize the CVT or MPPT in Photovoltaic pumps system, and program the software.The results of the experiment show that this system,which is made on the base ofthe theory above, can control the sensorless Bldc motor to complete the exactcommutation. The system presents good static http://www.chinamagnets.biz/Alnico/Cast-Alnico-Magnet.php and dynamic performance. The drawbackof the system is show in the end. We also give some advice for improvement.