The DC motor is a magnetic field that does not move, and the conductor moves in the magnetic field; the AC motor is a magnetic field that rotates and prevents the body from moving.
1. The working principle of the general DC motor
The DC motor is divided into stator winding and rotor winding. The stator winding generates a magnetic field. When the DC current is applied, the stator winding generates a magnetic field with a fixed polarity .
2. The working principle of brushless DC motor
When the built-in Hall sensors are powered on, these Hall sensors input signals to the controller, (in fact, these signals indirectly reflect the position of the rotor). After judging these signals, the controller makes corresponding outputs, and When the corresponding coil is energized, the electricity generates a magnetic field. Because of the principle that the same sex repels each other and the opposite sex wants to attract, the rotor and the rotor move relative to each other.
The stator of an ordinary brushless motor is a coil (with ear sensors attached to it), so the rotor (magnet and wheels) is forced to rotate. As soon as the rotor rotates, the output signal of the built-in re-sensor changes, the controller outputs currents in different directions, and the magnetic field generated by the output just repels the fixed magnetic field (magnet) again, and attracts the opposite, and the result is forced again. The rotor rotates, and then the output signal of the Hall sensor changes again.... In this way, the wheel continues to rotate (every time the Hall signal changes, the direction of the current generated by the controller must be consistent with that required by the motor, That is, the phase sequence must be matched, and the wheel will move in one direction).