Underwater Vehicle Propulsion Using The Permanent Magnet Motor Working Status Of Thermal Analysis

The advantage of permanent magnet motor is simple structure, mini volume and higher efficiency, so it is used as a propel motor in electric under-water vehicle. In this paper, a study on steady temperature field of a DC permanent magnet motor used in under-water vehicle is presented, and, the effect of the motor efficiency caused by the increase of temperature is analyzed.First, the heat resource and the limit of the increase of temperature are presented based on normal theory of motor's temperature increase. Then, the boundary condition of motor's heat transfer is analyzed, on the theory about heat transfer. And, the motor's temperature field is calculated by a finite element software, ANSYS, the temperature of motor's parts is confirmed. In the last place, the decrease of motor's efficiency is ascertained, and the author brings some advice. All of this presents a theory foundation on motor design and improve.In addition, based on the finite element analyze of motor composed nearly by fifty parts, a method of finite element analyze in multi-part system is founded, which indicates the function of finite element technology in the study on field.