Brushless DC motor is a new type of DC motor developed in recent years with the development of microprocessor technology, the application of new power electronic devices with high switching frequency and low power consumption, the optimization of control methods, and the emergence of low-cost, high magnetic energy level permanent magnet materials.

A direct current generator is a machine that converts mechanical energy into direct current electrical energy. It is mainly used as a DC motor for DC motors, electrolysis, electroplating, smelting, charging, and excitation power supply for alternators. Although power rectifier components are also used to convert AC power into DC power in places where DC power is required, in terms of some operating performance, AC rectifier power cannot completely replace DC generators.