What is difference is of VSD,VFD,VSDS, are they the same as the direct current to control dc using above mention


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hi every body i am master student in control engineering and my project is slip control in trains i assumed a Dc motore as traction motor but i don't have characteristics of this kind of motor that is used in train. i want from every body if he or she has the characteristics or information about Dc motor that is used in train give me those information or technical characteristics .

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Assume a condition such that two motors of rating 6.6kv,415v are connected to blower,so tell me which motor draw large current give appropriate reason?

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ROC converges if poles and zeros lie inside a. Origion b. Z=1

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