Brushed DC motor working principle
Brushed DC motor works as shown in Figure 2-1. In the fixed part of the brush DC motor with a magnet, here referred to as the main pole; fixed part also brush. The rotating part has an annular core and windings wound on the annular core.
A fixed pair of permanent magnet main poles N and S excited by DC excitation are mounted on the fixed portion (stator) of the two-pole brushless DC motor shown in Fig. 2-1, and an armature core is provided on the rotating portion (rotor). There is an air gap between the stator and the rotor. Armature coil placed on the armature core by A and X two conductors connected to the coil, the first and the end of the coil are connected to the two arc-shaped copper, the copper is called commutator. Reversible pieces of insulation between each other by the commutator composed of the whole called the commutator. The commutator is fixed on the shaft, and the commutator plates and the shaft are mutually insulated. A pair of stationary brushes B1 and B2 are placed on the commutator. When the armature rotates, the armature coils are connected to the external circuit through commutator segments and brushes.