Is the brushless dc motor a synchronous motor or asynchronous machine? Thank you very much!
The principle of brushless dc motor is similar to that of permanent magnet ac synchronous motor, but not synchronous motor. Strictly speaking, synchronous motor refers to ac motor which is kept constant in normal operation and has a strict constant relation between speed and power frequency. Is a brushless dc motor speed or change with the load, the second is ac motor, no power frequency, and the frequency of the internal rotating magnetic field will change with the load. So I can only say that communicate with permanent magnet synchronous motor is the same principle, motor rotor is a permanent magnet, but brushless motor with position sensor to detect the rotor position after the stator winding in turn electricity to produce a rotating magnetic field, and ac synchronous motor made with an alternating current to produce a rotating magnetic field. Its movement principle has nothing to do with a brush dc motor, brushless dc motor has is produced by the magnetic field and rotor dynamics is the electromagnetic force after cutting magnetic induction line, is not between the poles of attraction.
Motor classification: dc motor and ac motor are one level, and ac motor is classified with synchronous motor and asynchronous motor.
No brushless dc motor is dc motor, no asynchronous, synchronous problem. Only ac motor can be divided into synchronous motor and asynchronous motor. The so-called brushless dc, just use the switch instead of brush commutation function, ensure that motor armature always receive appropriate dc power supply to ensure their normal operation.
The principle of brushless dc motor is different from that of ordinary induction motor, which cannot be separated by synchronous or asynchronous. The so-called synchronous and asynchronous means that the rotor and air gap in the rotor and air gap hold the same rotational speed while the motor is running.
