For the BLDCM with photoelectric position sensor, the stator assembly is equipped with photoelectric sensor according to a certain position, the rotor is equipped with light shield, and the light source is led or small bulb. When the rotor rotates, the photosensitive components on the stator will generate pulse signals intermittently at a certain frequency due to the function of the light shield.
The BLDCM with electromagnetic position sensor is equipped with electromagnetic sensor components (such as coupling transformer, proximity switch, LC resonance circuit, etc.) on the stator assembly. When the permanent magnet rotor position changes, the electromagnetic effect will make the electromagnetic sensor produce high frequency modulation signal (its amplitude changes with the rotor position).
In terms of structure, there are similarities between the brushless motor and the brush motor, and there are also rotors and stators, just opposite to the structure of the brush motor; the rotor of the brush motor is the coil winding, which is connected with the power output shaft, and the stator is the permanent magnet steel; the rotor of the brush motor is the permanent magnet steel, which is connected with the shell and the output shaft, and the stator is the winding coil, which is used to replace the brush motor The reversing brush that transforms the electromagnetic field is called the brush motor. Now there is a problem. Without the transformation of the electromagnetic field, how to make the brush motor rotate?
In short, by changing the alternating frequency and waveform of the current wave input to the stator coil of the BLDCM, a magnetic field is formed around the winding coil that rotates around the geometric axis of the motor. This magnetic field drives the permanent magnet steel on the rotor to rotate, and the motor starts to rotate. The performance of the motor is related to the number of the magnetic steel, the magnetic flux strength of the magnetic steel, the input voltage of the motor, and more importantly The control performance of the BLDCM has a great relationship, because the input is DC, the current needs to be changed into 3-phase current by electronic governor, and the control signal needs to be received from the remote control receiver to control the speed of the motor to meet the needs of the model. Generally speaking, the structure of the BLDCM is relatively simple, which really determines the performance of the BLDCM or the BLDCM. A good electronic governor needs the overall control of the single-chip microcomputer control program design, circuit design, complex processing technology and other processes.
