Research On The Deep-ocean Pressure-compensated Oil-filled Motor

In our country, as the development of ocean economy and the improvement of the detection, exploration and development capability in ocean, the needs of the deep electrical motor become bigger and bigger. At present, some prototypes of the compensated mini-power DC brushless servo motor which could be used under the circumstance of high pressure designed by some foreign ocean research institutions only with the purpose of self-usage.In China, because there are no products of this kind of motor, all the consumption of this kind of motor relies on imports. To solve this problem, this paper focuses on deep ocean pressure-compensated oil-filled motor, which means when the motor works under the deep sea, the pressure of the interior motor equals the pressure of the sea at the working depth.Deep ocean pressure-compensated oil-filled motor can replace the complicated under sea adapted hydraulic system, and it can drive the implementation of the various components of the working machine directly. This motor simplifies the system of underwater structures and institutions, which doubled reduce the weight of the underwater system, as a result, the system reliability was improved significantly. This paper studies the deep sea pressure compensation for the motor through the spring pressure and a series of key technical issues caused by the pressure compensation. The author has designed a system which can test the efficiency of the motor under the circumstance of the high pressure container, and reaches the target of mastering and monitoring the performance characteristics of the deep sea motor. According to that system, the specifications of the deep sea motor can be expanded, and the system provides a good condition for large scale production.This paper has five chapters. Chapter 1 is the introduction. It concludes the purpose and the meanings of the study, and the development of the study at home and abroad. Chapter 2 concludes the structures of the motor, the optimization methods of the seal of the motor. Brushless DC motor used for the bulk of the permanent magnet rotor diversion design, armature windings of the stator epoxy resin vacuum, which guarantees the loss of the power caused by the structure of the rotor stirred oil reach minimum. Address prototype development stage, to take the oil and electricity distribution integration of the program, reducing the requirements for sealing. Chapter 3 is the study on fluid dynamic modeling. In this chapter, the author establishes a finite element model of a permanent magnet rotor rotation stirred oil. According to the comparison of the theoretical data, simulation data and actual data, the author states that the size of ring slit between the stator and rotor, the dielectric oil viscosity, viscosity-temperature, Pressure-viscosity index are the vital factors which decide whether the efficiency of the operation of the motor in the deep sea is high or low. As a result of the study, the selection of the oil-filled transformer oil as a medium of motor oil is made. Chapter 4 is the study and design on the test of deep sea pressure simulation. The author analyzed the distribution of the various environmental power of the testing system clearly. Based on the tests through various environments, with the comparison of the experimental data, the author has obtained the forms of the loss of the motor power and the factual efficiency under the simulation of the deep sea, and also identified the key point to improving the efficiency of designing the deep sea motor. Chapter 5 is conclusion. The author gives some views of the optimization of the existing motor, and also prospects for the future research.