220V AC brushless motor and controller,HOPRIO die grinder ,it is a representative of speed,high efficiency and long lifetime,its efficiency is much higher and can save more quick-wear parts,compatible with engine generators,will give you a new experience.no carbon brushes, no commutator,no field coil. When the power supply is accidentally cut off or restores,the motor will not restart,thus minimizing the accident. this grinder is commonly used in metal fabrication, welding preparation, surface grinding, and other industrial applications that require high-performance grinding tools. With its advanced features and reliable performance.