Motor accessories refer to the parts of the motor assembled in the motor manufacturer for the original parts of the motor, due to improper use or damage caused by wear and tear replacement parts called motor accessories. General parts life is not as long as the original life. Motor accessories can be divided into five parts. The classification of motor accessories can probably be classified according to the components of the motor, which can be divided into motor stator, motor rotor, stator winding, Motor Housing, end cover, motor blade, bearings and other parts. It can be manufactured by CNC Machining, Sand Casting, transparent acrylic(PMMA/PC) 3D Printing.

The excitation mode of DC motor refers to the problem of how to supply power to the excitation winding and generate the excitation flux potential to establish the main magnetic field. According to the different excitation mode, DC motors can be divided into the following types.
1. Encourage
There is no connection between the excitation winding and the armature winding, and the DC motor powered by other DC power supplies to the excitation winding is called the separately excited DC motor, and the wiring is shown in Figure 1 (a). In Figure 1, M represents the motor, and if it is a generator, it is represented by G. Permanent magnet DC motor can also be regarded as separately excited DC motor.
2. Encourage
The field winding of a shunt DC motor is in parallel with the armature winding. As a shunt generator, the end voltage emitted by the motor itself supplies power to the excitation winding; As a shunt motor, the field winding and armature share the same power supply, and the performance is the same as that of separately excited DC motor.
3. String together
After the excitation winding of the series DC motor is connected to the armature winding in series, it is connected to the DC power supply. The exciting current of this kind of DC motor is the armature current.
4. Reinforce
The compound DC motor has two exciting windings: shunt and series. If the flux potential generated by the series winding is in the same direction as the flux potential generated by the shunt winding, it is called cumulative compound excitation. If the two flux potentials are in opposite directions, it is called differential 5.
Dc motors with different excitation modes have different characteristics. In general, the main excitation modes of DC motor are shunt excitation, series excitation and compound excitation, and the main excitation modes of DC generator are separate excitation, shunt excitation and compound excitation.

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