Third, the working principle of brushless DC motor
The stator of a brushless DC motor is a coil winding armature, and the rotor is a permanent magnet. If only a fixed direct 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.
Figure 2 shows the schematic diagram of the rotating principle of the brushless DC motor. For the convenience of description, the coil center tap of the motor stator is connected to the motor power supply POWER. The end of each phase is connected to the power tube. When the position sensor is turned on, the G pole of the power tube is connected. 12V, the power tube is turned on, and the corresponding phase coil is energized. As the three position sensors rotate with the rotation of the rotor, the corresponding phase coils are energized in sequence, so that the direction of the magnetic field generated by the stator also changes continuously, and the rotor of the motor also rotates. This is the brushless DC motor. The basic principle of rotation - detecting the position of the rotor, energizing each phase in turn, so that the direction of the magnetic field generated by the stator changes continuously and uniformly.
In order to facilitate understanding, the following two contents are used as the model introduction in the following contents. Figure A shows that the rotor and stator of the motor are on the same center, and Figure B is on a different center to explain the internal magnetic field of the motor.
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