120kW双复合励磁功率极限利用电机设计

On HighPowerDensity LowElectromagneticInterference REPM DC Propulsion Motor System

１２０ｋＷ双复合励磁功率极限利用电机设计李声晋①陈钢②李钟明③水下航行器推进动力有电、热之分，与热动力相比，电推进具有无航迹、低噪声、大潜深等优点。电动力以电池为能源，电机驱动螺旋浆产生推进动力，因此，电池和推进电机的功率、效率、功率密度是决定水下航...

Limit design (or reliable performance within a limited time and more importantly no more than such a limited time) of such a REPM (rare earth permanent magnet) motor is now needed by P.R. China. REPM was utilized because it could make high power density possible more easily and reduce amount of magnetic material needed. Beside the mechanical limit , the two main considerations of our limit design were: commutation limit and temperature rise limit. Commutation limit was visualized to be achieved by the proposed composite excitation structure shown in Fig.1. The design objective was to implement linear commutation for both the electric excitation part (Fig.1b) and the REPM excitation part (Fig.1c). Proper design concerning temperature rise limit depended, in our view, on correct handling of heat dissipation unavoidable when high electric load, high magnetic load and high speed had to be used in limit design. For correct handling, the variations of properties of functional materials with temperature had to be accurately determined. We adopted the generally used thermal network method to calculate them. The curves for four materials were calculated and shown in Fig.2. Parts of these four curves were experimentally verified to be quite accurate. A factory manufactured such a REPM motor designed along the lines outlined. Various performance indices were experimentally measured as shown in Table 1 and they appeared to be quite satisfactory.