The first is structural design, and the most important thing in structural design is waterproof design. The waterproof motor here can only prevent shallow water and can't work in deep water, so it is waterproof to cover the shell, and then fill the shell with oil, which can not only lubricate, but also quickly dissipate heat for the motor.

Then the propeller. Firstly, write the module in MATLAB into the program, modify the corresponding parameters in the program, and finally generate the propeller data. Then import the data into CATIA three-dimensional modeling software to generate three-dimensional propeller model, and then after detailed processing, draw drawings for production and processing.

The underwater special propulsion motor is introduced as follows:

Underwater special propulsion motor is a high-tech electric propulsion device, and its technical contents include fluid design, motor design and material selection. Its structure is novel and unique, with unique and superior characteristics, which is very suitable for the propulsion system of underwater robots and torpedoes.

The selection of underwater special propulsion motor is introduced as follows:

The choice of motor type has great influence on the power system and overall performance of aircraft, so it is necessary to compare and analyze different motors and their control methods. At present, there are four kinds of medium and small power drive motors being applied or developed: DC motor, induction motor, permanent magnet brushless motor and switched reluctance motor.

The DC motor is introduced as follows:

DC motor has the characteristics of simple structure and excellent electromagnetic torque control, so it was still the main research object at home and abroad until the mid-1980s, and DC drive system was still widely used. However, the mechanical commutation structure of ordinary DC motor is easy to produce sparks, which is not suitable for use in dusty, humid, flammable and explosive environments.

Its commutator is difficult to maintain and develop to large capacity and high speed. In addition, the electromagnetic interference caused by electric spark will be fatal to the highly electronic underwater robot. In addition, DC cars are expensive, bulky and bulky. With the development of control theory and power electronics technology, DC drive system is at a disadvantage compared with other drive systems.