Brushless DC motor working principle
The brushless DC motor is actually a permanent magnet synchronous motor. The source of the force is mainly the distortion of the magnetic field line. Simply put, if the stator magnetic field is in the same direction as the magnetic field line of the rotor magnetic field, then the magnetic field line will be smooth at this time, and everyone is very harmonious. There is no torque generated between them; however, if the rotor magnetic field is inconsistent with the direction of the stator magnetic field, the distribution of magnetic lines of force will be uneven. At this time, the magnetic field will interact with each other to make the direction of the stator magnetic field uniform, thus generating a moment; Brush motor, you only need to make the stator magnetic field rotate in space at a certain speed, the anti-distortion force of the magnetic line will make the rotor magnetic field rotate at the same speed as the stator magnetic field, thus achieving permanent magnet synchronization; you can imagine if the load turns If the moment is 0, then the direction of the stator's magnetic field will inevitably approach coincidence during the rotation, and if there is a constant load torque, the magnetic field between the stator and rotor will have a fixed angle. The magnitude of the load torque is the same.
Brushless DC motor principle
The stator of a brushless DC motor is a coil winding armature, and the rotor is a permanent magnet. If only a fixed DC current is applied to the motor, the motor can only generate a constant magnetic field, and the motor cannot rotate. Only the position of the rotor of the motor is detected in real time, and the corresponding current is communicated to the motor according to the position of the rotor. The stator produces a rotating magnetic field that changes direction uniformly, and the motor can follow the magnetic field.
