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2005 - 200912010 - 20181
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Subject: Electrical Engineering × Author: Rawat, Harendra Singh ×
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    ThesisItemOpen Access
    Performance analysis of axially laminated anisotropic synchronous reluctance motor
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2005-07) Rawat, Harendra Singh; Banerjee, G.K.
    In an effort to obtain better performance of SRM by obtaining a high ratio of direct (d) axis to quadrature (q) axis magnetizing inductances ( d q L L ) an axially laminated anisotropic (ALA) rotor was designed and fabricated. To construct an ALA rotor the axially laminated segments were constructed with multiple C.R.G.O laminations interleaved with milo paper insulation sheets. The thickness of C.R.G.O lamination and milo paper insulation sheet were of .2 and .25 mm respectively. The rotor has been designed for four poles configuration. The objective of this study was to design and fabricate axially laminated anisotropic synchronous reluctance motor for performance analysis. Parameters of SRM determined by A.C stand still test. The saturation effect was studied by synchronous running test. We analyzed the steady state and dynamic state behaviour of the SRM by developing a mathematical model. The presence of third and fifth harmonic at no-load and load condition was also determined. The results reveal that the steady state analysis performance on simulated of SRM as well as experimentally on test motor were in close agreement. The saturation effect was found negligible in motoring mode. The harmonic contents included third and fifth harmonics in very small percentage and increased slightly with loading.
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    ThesisItemOpen Access
    Performance investigation of axially and transversally laminated synchronous reluctance motors
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2018-01) Rawat, Harendra Singh; Srivastava, Ajay
    Electric motors considered as workhorse of the modern industries, consume about 70% of the industrial electrical demand. Hence there is an increasing demand for motors which are highly efficient, economical and provides high power output per unit volume. A few newly adopted machines like permanent magnet and reluctance machines have replaced the conventional dc and induction motors in many applications. But the permanent magnets being made up of costly rare earth materials have now given way for more reliable and satisfactory reluctance machines. The rotor design of a Synchronous Reluctance Motor (SynRM) has a significant effect on its efficiency, torque ripple and maximum torque. In order to achieve a good compromise between these three goals, optimized rotor design is necessary. Due to nonlinear characteristics of magnetic materials, finite element method is considered to be a better approach for rotor optimization of the SynRM. The two most crucial design parameters of a SynRM are position and width of flux-barriers for the torque output and torque ripple. This paper proposes an approach to obtain the optimized values of the above mentioned parameters. So in order to achieve design with a low torque ripples and enhanced torque output for a SynRM with full pitch distributed windings in 24 slots on stator. This method is valid for a wide range of SynRMs. It also provides insight into the behaviour of the machine as a function of position and width of flux barriers. Furthermore, the torque and torque ripple of SynRMs having an axially and transversally laminated rotor are compared.