micro brushless motor factory tells you the principle of brush motor
1、 Principle of brush motor
The brush motor adopts mechanical commutation, the magnetic pole does not move, and the coil rotates. When the motor works, the coil and commutator rotate, the magnetic steel and carbon brush do not rotate, and the alternating change of coil current direction is completed by the commutator and brush rotating with the motor.
In a brush motor, the process is to arrange two power input ends of each coil into one ring in turn, separate them with insulating materials, and form a cylinder like thing, which is integrated with the motor shaft. The power supply is made of two carbon elements through a small column (carbon brush). Under the action of spring pressure, from two specific fixed positions, the coil power supply is pressed on top Enter two points on the circular cylinder to energize a set of coils.
With the rotation of the motor, the different poles of different coils or the same coil are energized at different times, so that the N-S pole of the coil generating magnetic field has a suitable angle difference with the N-S pole of the nearest permanent magnet stator, and the magnetic field attracts and repels each other in opposite direction, generating force, and promoting the rotation of the electric machine. The carbon electrode slides on the coil connector like a brush on the surface of an object, so it is called a carbon "brush".
Sliding each other will rub the carbon brush and cause loss, so it is necessary to replace the carbon brush regularly; the on-off alternation between the carbon brush and the coil terminal will cause electric sparks, electromagnetic damage and interference with electronic equipment.
