The misunderstanding between the brushless motor -

Many people have seen model with brushless motors, batteries, they use so a lot of people there has been such a misunderstanding in the knowledge, thought the brushless motor is a dc motor, actually otherwise, brushless motor is ac motor, is a kind of three-phase ac permanent magnet motor, brushless motor input model 3 wire current is the alternating current (ac), it's just, it is not a 50 hz ac mains sine wave, but from the brushless motor controller ( Commonly known as brushless electric adjustable) Three-phase alternating square wave modulation, frequency is higher than 50 hz, and the changes over the motor speed.