Dc permanent magnet brushless motor drives the pump

Dc motor has been widely used in motion control system because of its good mechanical characteristics, wide speed range, large starting torque, high operating efficiency, simple control, etc., but its brush and commutator also bring low reliability, need frequent maintenance and other weaknesses. In the past 20 years, with the rapid development of high-power switching devices, analog and digital integrated circuits, computer technology, and high-performance magnetic materials, brushless DC motors using electronic commutation principle have also been rapidly developed. It has been rapidly expanded from the initial application of aerospace and military facilities to industrial and civilian fields, and its use is increasingly widespread. Small power brushless DC motor has been widely used in computer peripherals, office automation and audio and video equipment, and in some electric transmission systems, its application is more and more extensive.