MATHEMATICAL MODEL OF INDUCTION MOTOR WITH SERIES-CONNECTED STATOR AND ROTOR WINDINGS
DOI:
https://doi.org/10.14529/power170111Keywords:
industrial mechanisms, electric drive, asynchronous motor, phase rotor, impulse-vector control system, sensorless control, mathematical model.Abstract
To provide for the cost-effective use of resources and energy conservation it is vital to enhance unregulated
electric drives of copious working mechanisms. The technical process of these mechanisms requires relatively
longstanding speed reduction under low static loads. Moreover, another relevant issue is choosing control systems
of electric drives in the mentioned systems in accordance with the economic and maintenance aspects. The authors
suggest using the systems of impulse-vector control system with wound rotor induction motor that have one essential drawback – the shaft encoder installation. The replacement of the shaft encoder with sensorless impulse-vector
control system is complicated due to the lack of proper mathematical description of the electromagnetic processes
in schemes with non-traditional windings stator and rotor connection . To solve this problem the authors have developed a mathematical description of impulse-vector control system with wound rotor induction motor supposed
to be multiphase and asymmetrical. Angular dependencies of inductances, flux linkages, voltages of engine windings, circuit current and electromagnetic torque relatively to rotor location are derived. In addition to that, the mathematical modeling and research of induction motor configuration with a series connected windings fed by AC
voltage source are presented. Equating rotor position in impulse-vector control system with wound rotor induction
motor is considered possible through angular dependencies of drop voltages on stator and rotor windings
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