关键词: 开关逆变, 驱动电路, 太阳能水泵, 直流无刷电机, 无位置传感器

Abstract: A control system of solar water pump based on position sensorless permanent magnet brushless DC motor is designed, which has STM32 as the main control chip. The paper mainly introduces hardware design and software program design. The hardware design includes switch inverter circuit, drive circuit, and voltage detection circuit, etc. In this paper, the three-phase current is sampled by the internal resistance of the MOSFET and the rotor position signal is obtained by the zero-crossing detection method of the back electromotive force (Back-EMF). The reliability of the hardware circuit and the feasibility of the software program architecture are verified by the relevant experimental waveforms and data on the three-phase submersible pump.

Key words: switching inverter, drive circuit, solar water pump, BLDCM, sensorless