How does a brushless DC motor work? Do you all know

Let’s start with the basic principle of electric motors, we all played with magnets when we were kids, opposite poles attract each other, two magnets close to the “snap” on the collision.

Now suppose your hand is fast enough to hold a magnet in front of a crazy hook, then another magnet has been following you. Your hand is holding a magnet to draw circles, another magnet also follow you to turn circles.

The above is the basic principle of motor rotation, of course, it is very simple to say so, except that the “magnet” used to seduce in front is not a real magnet, but a magnetic field generated by the coil after being energized.

Brushless DC motor, the stator of the motor is a coil, or winding, and the rotor is a permanent magnet, which is a magnet. According to the position of the rotor, the microcontroller is used to control the energization of each coil, so that the magnetic field generated by the coil changes, thus constantly hooking the rotor in front to make the rotor rotate, which is the rotation principle of the brushless DC motor.

A coil can be understood as something that grows like a spring. According to the right-handed spiral rule learned in elementary school, when the current flows from the top to the bottom of the coil, the polarity at the top of the coil is N and the polarity at the bottom is S. Now make another such coil. Then fiddle with the position. This way, if the current passes through, it will be like having two electromagnets. Get another one to make the three-phase winding of the motor. Add a rotor made of permanent magnets, and you have a brushless DC motor.

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