Study Of Multiphase Induction Motor Applicability In Dc Electrified Conventional Railway

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Power transmission to electric locomotives and railway vehicles can be carried out using DCrnor single-phase AC networks. The utility company supplies the railway company with ACrnvoltage which can be used as either DC voltage or AC voltage depending on the differentrnfactors. Propulsion is provided by induction (AC) motors in both cases. rnConventional three-phase induction motor have been seen as the standard for electricalrnalternating current drives for industry and transport, although they have an inherent setback inrnterms of performance with regards to the loss of phase conditions. In view of this loss of phase,rnthe three-phase induction engine does not provide sufficient operation, such as power outputrnand torque, as required in electrical traction and other applications. Thus, the Multiphasernmachine has several advantages over the conventional three-phase motor such as costeffectiveness,rnrnreduced torque pulsation, reduced harmonic current per rotor phase, highrnreliability and high fault tolerance. rnThe same machine parameters were used to simulate the system in Matlab/Simulink softwarernusing mathematical models to create the Simulink blocks in order to test the output of bothrnthree and six phase induction motors in DC traditional railway traction system. The study ofrnthe economical aspect of multiphase induction motor compared to three phase motor was alsorncarried out. The V/F motor speed control technique was employed, in which the frequency andrnvoltage decrease proportionally (their ratio remaining constant), while peak torque remainsrnconstant, resulting in speed control and an increase in starting torque up to the motor'srnmaximum torque. rnThe distortion was shown to be higher in three phase motors than in six phase motors. Therntorque in six phase IM was seen to be 1.86 times that of three phase induction motor while thernspeed in three phase induction motor is 2.6 times that of six phase induction motor. The overallrnimpact of multi-phase systems yields in a small reduction in price (-11%) according to therneconomic analysis of both motors. rnAs a result, using a multiphase induction motor in a DC railway would improve energyrnefficiency, and cost savings, as well as help to increase traditional railway capacity i.e. thernnumber of trains that can travel over a given section of line during a given period of time.

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Study Of Multiphase Induction Motor Applicability In Dc Electrified Conventional Railway

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