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In order to achieve high thrust density and low thrust ripple simultaneously, a multiobjective optimization design method is applied to ironless permanent magnet linear synchronous motor with non-overlapping windings. On the basis of the magnetic field analysis model, the analytical formulae of key parameters such as No-load back EMF, thrust per copper quality and thrust ripple was deduced. Further, a multiobjective optimization is carried out by genetic algorithm to search for the optimal design variables. The design optimization is verified by 2-D Finite Element analysis and experimental results of the prototype.

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This paper proposes a novel flux-modulated permanent magnet(PM) linear generator with sandwiched armature stator, which can achieve high thrust force density and fast response for free-piston energy converter. First, operating principle of the proposed tubular linear generator is discussed. And then influences of key design parameters of sandwiched armature on electromagnetic performances are analyzed by analytical and time-stepping finite element method (FEM). The FEM calculated results are consistent with those obtained theoretically.

The current situation, domestic supportive policies and problems of photovoltaic generation technology are analyzed. According to the roof resources and solar illumination conditions in Shanghai, feasibility analysis of distributed roof photovoltaic generation technology is presented in angle of economic feasibility. The influence of generation price subsidies on the internal rate of return and payback period is obtained and finally raising advices to improve domestic photovoltaic generation technology.