This paper proposes a control strategy for the electronic pole changing (EPC) induction motor drive (IMD) transition between 3-ϕ,12-pole mode to 9-ϕ,4-pole mode. The proposed employs gradual (GEPC) technique which linearly demagnetizes IMD winding from and magnetizes progressively GEPC is also compared with instantaneous EPC its performance. solution eliminates issue of circulating current, exi...

Maps of epithermal- and fast-neutron fluxes measured by Lunar Prospector were used to search for deposits enriched in hydrogen at both lunar poles. Depressions in epithermal fluxes were observed close to permanently shaded areas at both poles. The peak depression at the North Pole is 4.6 percent below the average epithermal flux intensity at lower latitudes, and that at the South Pole is 3.0 pe...

The increased safety (Ex e) motors are designed for safe operation in the zone 1 and 2 hazardous areas. The present paper describes the significant design parameters and successful testing of Ex e high tension (HT) induction motor rated 970KW/6.6KV/18 pole/ 3Phase/ 50Hz as per IS/IEC 60079-7 standard. The comparison of some useful design parameters is also given between safe area motor and haza...

The Permanent Magnet Synchronous Motor (PMSM) is widely used for various applications. It the highly efficient motor as there are no field copper losses. electrical energy supplied to through generator and size depends upon output. efficiency of factor which will affect generator. This paper contributes research work design 35 kW, 440 V, 1000 rpm, 8 pole with Interior mounted Magnets (IPMSM) Hy...

induction motors are the most commonly used in the traction industries and electric vehicles, due to their low primary cost, low maintenance costs, and good performance. speed identification is needed for the induction motor drives. however, using of speed sensors in the induction motor drives is associated with problems such as, extra cost, reduced reliability, added mounting space, etc.. ther...

Based on a study of high-energy epithermal (HEE) neutrons in data from the Lunar Exploration Neutron Detector (LEND) on NASA's Lunar Reconnaissance Orbiter (LRO), the background from HEE neutrons is larger than initially estimated. Claims by Mitrofanov et al. (Reports, 22 October 2010, p. 483) of enhanced hydrogen abundance in sunlit portions of the lunar south pole and quantitative hydrogen co...