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In this paper we study the controllability of damped second order neutral impulsive stochastic functional differential system with infinite delay in Hilbert spaces. Sufficient conditions for controllability results are obtained by using the theory of cosine families of bounded linear operators and fixed point technique. An example is provided to illustrate the theory.

The permanent magnet synchronous motor (PMSM) is receiving wide attention for industry application due to their high reliability, high power, high torque density and high efficiency. Recently, for application requiring high dynamic performance, direct torque control (DTC) is employed. Compared to other technique, DTC directly manipulates the final output voltage vector without the need of inner current loop and hence eliminate the inherent time delay. In spite of the merits, it had some disadvantages like large torque ripple and large acoustic noise among others. The mechanical vibration and acoustic noise are directly related to the large torque ripple. In existing, DTC fed PMSM uses the method of effective voltage vector combinations to reduce the torque ripple and thereby reduce the mechanical vibration and acoustic noise. In this proposed work, the analysis of mechanical vibration and acoustic noise is analyzed in both simulation and experimentally for various speeds and load changes. This analysis is done by using the Lab VIEW graphical programming language platform, which provides an efficient and accurate result.