No abstract

A new rapid casting process based on gelcasting and stereolithography (SL) has been developed to fabricate integral ceramic moulds for complex castings. An overview of the fabrication process is demonstrated. It is shown that preparation for ceramic slurry, design of the process system, pyrolysis of the resin prototype, and integrity of the ceramic mould all play a significant role in the whole process. A hollow turbine blade with complex internal and external structure was taken as the case study to verify the feasibility and effectiveness of the proposed process.

In this paper, a DC voltage pulse injection based method is proposed to detect the initial position and rotor polarity of permanent magnet synchronous motor (PMSM). The rotor angle vibration is expressed analytically as a function of the injected pulse. The nonlinear numerical simulation model of PMSM is employed, in which the saturation saliency is incorporated as well as the structural saliency. The proposed scheme is simulated and verified by using the nonlinear model and a two-dimensional finite element method (FEM) algorithm, respectively. The initial position detection is tested at different starting positions and the results show that the proposed scheme can be used to identify the PMSM initial rotor position.Index Terms-Finite element magnetic field analysis, initial rotor position, nonlinear magnetic model, permanent magnet (PM) machine.

No abstract

No abstract