In order to minimize the eddy current loss, the stator is made of thin insulating metal plates that cancel each other out. Both the inner and outer rotor motor use slot windings, and the winding wire is wound on the iron core, so that the magnetic field lines of the winding can flow out and converge into a certain shape. In the outrunner motor the stator is located inside, and the rotor consists of a bell shaped housing that rotates outside, on which the magnet is mounted. Most brushless DC motors are inrunner motors, whose stator is fixed with coils, and the rotor in the middle rotates under the action of permanent magnets on the rotating shaft. In many applications, Brushless DC motor is a perfect solution to replace a brushed DC motor or a commutator motor. Therefore, BLDC motors are also called EC (electronic commutation) motors to distinguish them from mechanical commutation motors that include brushes. Different from the brushed DC motor, brushless DC motor cooperates with the electronic drive controller to replace the function of the brush and convert the fed DC power into AC power, which achieve the performance equivalent to the brushed DC motor without the brush with limited service life. Usually in the brushed DC motor, after applying DC voltage, the mechanical inverter (brush) in the motor will generate AC power independent of the speed. Three-phase motor has a multiple of 3 slots.The brushless DC motor (BLDC motor) is actually a three-phase synchronous motor: The rotor follows a rotating magnetic field, and its motion synchronizes with the AC voltage applied to the winding. A slot represents the number of coils of fixed stators.Three-phase motor is a motor with three independent coils at 120 degree intervals. The phase represents the number of independent coils for fixed stators.(From the viewpoint of motor control, when the number of poles is doubled, the speed will be halved, and when the number of poles is quadrupled, the speed will be quartered, therefore the control method does not depend on the number of poles.) The number of poles can be 2, 4, 6, 8., etc. The pole represents the number of permanent magnet poles for the rotating rotor, and a motor with one pair of N pole/S poles is called a two-pole motor.When the number of poles and the number of slots increases, a large torque can be obtained and the torque pulsation also decreases. There are various combinations such as 4-pole 3-slot, 4-pole 6-slot, and 16-pole 12-slot.
The most basic 3-phase brushless motor is a 2-pole 3-slot motor. 3-phase motors are a common type of motor.
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