Working Principle Of Brushless Motor
In brushless motors, the commutation is performed by the control circuit in the controller (generally Hall sensor + controller, more advanced technology is a magnetic encoder).
The brushless motor adopts electronic commutation, the coil does not move, and the magnetic pole rotates. The brushless motor uses a set of electronic equipment to sense the position of the magnetic pole of the permanent magnet through the Hall element. Based on this perception, an electronic circuit is used to switch the direction of the current in the coil in time to ensure that the correct direction of magnetic force is generated to drive the motor . Eliminate the disadvantages of brush motors.
These circuits are the motor controllers. The controller of the brushless motor can also achieve some functions that cannot be achieved by the brushed motor, such as adjusting the power switching angle, braking the motor, reversing the motor, locking the motor, and using the brake signal to stop the power supply to the motor. Now the electronic alarm lock of the battery car makes full use of these functions.
The brushless DC motor is composed of a motor body and a driver, and is a typical mechatronics product. Since the brushless DC motor is operated in a self-controlled manner, it will not add a start winding to the rotor like a synchronous motor that starts under heavy load under variable frequency speed regulation, nor will it oscillate and lose synchronization when the load changes suddenly.