Structure of brushless DC motor. Brushless DC motor consists of coaxial external stator armature and internal permanent magnetic rotor. The stator armature is the guiding part of the motor, and the permanent magnetic rotor is the induction part of the motor. The stator armature is a 3-phase (U,V,W)
Simply put, By changing the current wave alternating frequency and waveform input to the brushless motor stator coil, A magnetic field completely around the geometric axis of the motor around the winding coil, This magnetic field drives the permanent magnet on the rotor, The motor was turned around, The performance of motor is related to the number of magnetic steel, flux, input voltage and other factors, More greatly related to the control performance of the brushless motor, Because the input is a DC current, The current requires an electronic governor to turn it into a 3-phase AC current, The control signal also needs to be received from the remote control receiver, Control the rotational speed of the motor, To meet the model usage needs. Overall, The brushless motor is relatively simple, What really determines the performance is the brushless electronic governor, Good electronic governor requires the overall control of MCcontrol programming, circuit design, and complex processing process, So the price is much higher than the brushless motor.
Working principle of DC brushless motor (drawing) DC brushless motor is a synchronous motor, that is, the speed of motor rotor is affected by the speed of motor stator rotation magnetic field and rotor poles (p): n=120.f / p. at the rotor pole
Simply put (the actual control is relatively complicated): to allow the motor to rotate, the control department must determine the current position of the motor rotor (the Hall sensor induction position or calculated position), make the current flow through the motor coil to produce a sequential (or reverse) rotating magnetic field and interact with the magnet of the rotor to turn the motor in time / reverse time. When the motor rotor turns to the position of another set of signals, the control unit turns on the next set of power devices, so that the circulating motor can continue to rotate in the same direction until the control unit decides to stop the motor rotor and close the power device