Synchronous motors are not often used below forty kW output in the medium velocity range due to their much increased preliminary cost compared to that of induction motors. In addition they need a dc excitation source, and the beginning and control devices which are often costlier. Where low speeds and excessive kW outputs are involved the induction motors aren’t any long cheaper.
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These machines are supplied with a heavy rotor winding so as to have a low slip, which facilitates in pulling it into synchronism. Additionally in order that the induced emf in the sector on the starting is probably not too high, the field turns provided are few in number and the excitation voltage is stored low. As the exciter winding serves the purpose of damper winding, so there is no such thing as a need of providing separate damper winding with synchronous induction motors.
MCA™ overcomes these points with a straightforward-to-use and comprehensible methodology of deenergized motor testing. It presents detailed, subject-confirmed and correct assessments for these three-phase AC motors. Our MCA™ instruments, just like the ALL-Check Professional 7™ and the ALL-Take a look at Professional 34™, are handheld, battery-powered instruments that provide step-by-step directions for performing the tests. Additionally they deliver a right away on-display assessment of the motor site (www.casamariaimmacolata.it) situation.