Brushless DC motor is the use of semiconductor switching devices to achieve an electronically commutated motor specification, which uses electronic switching devices replace the traditional contact commutator and brushes. It has high reliability, no commutation spark, and low mechanical noise, widely used in high-end tape deck, video recorders, electronic equipment and office automation equipment. Induction motor can be divided into: three-phase asynchronous motors, single-phase asynchronous motors and shaded pole asynchronous motors. AC commutator motor can be divided into: single-phase series motors, AC and DC motors and repulsion motor. Motor Theory, the Swiss mechanical and electrical liter (certified), motor ventilation and air conditioning provided by the liter Swiss mechanical and electrical equipment factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.com) is an industry leader in Shandong Dezhou, fans, ventilation equipment, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In liters Swiss electromechanical leadership with the staff warmly welcome all inquiries negotiations to create liter Swiss electromechanical better future.