Before the brushless DC geared motor is used, it is usually set up inside the device, and three Halls are often set inside the motor, so what is the reason for the built-in three Halls? The following are related reasons:
1. The front electromagnet coil is guiding the permanent magnet, and the rear electromagnet coil is pushing the permanent magnet, but we all know that if the magnetic pole of the coil does not change, the magnetic pole will be fixed when it reaches the position of the permanent magnet. Just like two magnets are attracted together, the magnetic poles of the coil are often changed when rotating. Who changes the magnetic poles for the signal coil? It's a Hall sensor. The Hall sensor can sense the position of the permanent magnet of the rotor and can report the position to the stator coil controller in time, and the controller controls the coil current flow inside the stator according to this information. In this way, the brushless DC geared motor starts to rotate.
2. Briefly speaking, in order to be able to rotate, the DC brushless geared motor must always have a certain angle between the magnetic field of the stator coil and the magnetic field of the rotor magnet. The process of rotor rotation is also the process of changing the direction of the rotor magnetic field. In order to make the two magnetic fields have an angle, the magnetic field direction of the stator coil must change to a certain extent. Three Hall sensors are a small number that can maintain the rotation of the brushless motor. The number of Hall sensors can be increased to increase the speed accuracy of the brushless motor. The more the number of sensors, the higher the speed accuracy of the brushless motor.
In the DC brushless geared motor, the reason for setting three Halls is mainly because the magnetic poles will change during the operation of the motor. The built-in three Halls can sense the position with a greater probability and communicate with the controller in time. connect. Improve the efficiency of the motor.