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This paper presents the applications of LabVIEW tools in the field of electrical engineering for student-centric learning such as power factor measurement, AC-to-DC converters, speed control of induction and DC motor drive. LabVIEW is a powerful graphical interface and user-friendly tool designed specifically for test, measurement and control. The power factor of resistive and inductive loads, the performance parameters of fully controlled converters and speed control of induction motor are performed in LabVIEW with DAQ device USB 6009. The speed control of a DC motor is performed with PI-speed controller using LabVIEW control and simulation toolkit and fuzzy logic controller. Measurement results are presented to validate the feasibility of system.

The research on Induction heating aided by power electronic control system is so vivacious in recent past. The selection of switching techniques remains to be the bottleneck for power engineering research as inappropriate selection may result in relentless switching loss, conduction loss, high current ripple, and lower power density. Therefore, modern design emphasizes multi-output resonant inverters, which not only have high efficiency but also facilitate resonant switching. This work proposes a single-stage ac–ac dual half-bridge series resonant inverter, with reduced number of switching devices. The proposed converter is controlled with fuzzy logic-aided digital pulse density modulation technique which aids in power control task. This intelligent power control scheme improves the system efficiency with less time-domain specifications. The simulation of the work is realized in MATLAB/Simulink arena, and hardware circuits are validated using dsPIC30F4011 microcontroller. The results reveal that the proposed schemes are highly viable and effective for the rendered application.

This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. A natural observer with load torque adaptation is employed to estimate the speeds of the same rating induction motors connected in parallel and fed by a single inverter. The speed difference between the two induction motors for unbalanced load conditions is less in natural observer than the conventional adaptive rotor flux observer. Direct field oriented control is used to calculate the rotor angle from the estimated rotor fluxes and the mean rotor flux is kept constant by rotor flux feedback control. The simulation and experimental results of studies are demonstrated for various running conditions to prove the effectiveness of the proposed method. The closed loop speed control operation with inner current control was performed by TMS320F2812 processor.

This paper describes a speed sensorless vector control method of the torque for cost-effective parallel-connected dual induction motor fed by a single inverter. A natural observer with load torque adaptation is employed to estimate the speeds of the same rating induction motors connected in parallel and fed by a single inverter. The speed difference between the two induction motors for unbalanced load conditions is less in natural observer than the conventional adaptive rotor flux observer. Direct field oriented control is used to calculate the rotor angle from the estimated rotor fluxes and the mean rotor flux is kept constant by rotor flux feedback control. The simulation and experimental results of studies are demonstrated for various running conditions to prove the effectiveness of the proposed method. The closed loop speed control operation with inner current control was performed by TMS320F2812 processor., U ovom radu opisano je vektorsko upravljanje momentom bez korištenja senzora brzine za paralelno spojeni dualni asinkroni motor napajan jednim inverterom. Prirodni observer s adaptacijom momenta tereta koristi se za estimaciju brzina jednakih asinkronih motora spojenih u paralelu i napajanih jednim inverterom. Razlika u brzinama između dva asinkrona motora pri asimetričnim teretima je manja kod prirodnog observera, nego kod konvencionalnog adaptivnog observera toka u rotoru. Izravno vektorsko upravljanje koristi se za računanje kuta rotora iz estimiranih tokova rotora, a srednja vrijednost toka rotora održava se konstantnom korištenjem upravljanja u povratnoj vezi. Simulacijski i eksperimentalmni rezultati prikazani su za različite pogonske uvjete kako bi se pokazala učinkovitost predložene metode. Upravljanje brzinom u zatvorenoj petlji s unutanjim krugom za upravljanje strujom izvodi se u TMS320F2812 procesoru.