ACCURATE DEFINITION EQUATION OF MOMENTS OF ROTATING ELECTRICAL MACHINES OF NAVIGATION DEVICES
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2017, Vol 1, Issue 104
Abstract
Purpose. Incorrectness of rotating electric machines torque equation notation and its interpretation, presented in Ukraine standard, theoretical justification and proposing the equations correct notation and interpretation. Methodology. Mathematical apparatus is used to describe the physical processes that cause electrical machines idling losses, operating mode independent, including electric losses in brushes and armature winding, in additional poles compensation winding and in compensation winding (if available), which are determined by idling armature current. Results. The article discusses State Standards of Ukraine, which concern rotating electric machines, requirements series inconsistency. Losses in rotating electric machine are determined using DC machine example. Using theoretical calculations was analyzed and proved that power losses are determined by sum of electrical and magnetic losses in rotating electrical machine. It was established that this sum of losses is greater than mechanical losses. Obtained results are compared on basis of DC machine with asynchronous and synchronous machines. Necessity to take into account electrical and magnetic losses in navigation devices electric micromachines operation analysis is noted. Questions of correct notation of rotating electric machines torque equation are revealed. Correct interpretation of electric machine fleeting move torque justified. Originality. For the first time, attempt was made to solve inconsistency problem of State Standards of Ukraine requirements series, concerning rotating electric machines, by proposing torque equation notation for rotating electric machines using the concept of idling moment, taking into account not only mechanical but also magnetic and electric power losses. Practical value. By way of power losses in DC motor armature detailed consideration , for example 2P series DC motor, in practice was shown difference between mechanical losses and sum of magnetic and elec-tric power losses in electric motor rotor. Ignoring these losses can affect electrical machines models accuracy during their behavior investigation as part of automation schemes. This is especially actual for electromechanical micromachines models due to their features. Сonclusions. Power losses that determine torque in rotating electrical machines torque equation are practically determined not only by mechanical losses, but also by sum of magnetic and electric power losses, which, moreover, is academically expedient to call moment of idling, as was customary in all "Electric Machines" textbooks previously.
Authors and Affiliations
О. Shefer, D. Neliuba
Keywords
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