Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Variable Frequency Drives"”.
-
Use of Variable Frequency Drives for Energy Savings in Curing Tobacco.
North Carolina State University Theses Biological and Agricultural Engineering.
-
Impact of System Impedance on Harmonics Produced by Variable Frequency Drives (VFDs)
Variable Frequency Drives (VFDs) are utilized in commercial and industrial facilities to improve motor efficiency and provide process flexibility. VFDs are nonlinear loads that inject harmonic currents into the power system, and result in harmonic voltages across the system impedance. This harmonic …
-
A Method for Evaluating the Application of Variable Frequency Drives with Coal Mine Ventilation Fans
… band of air pressures and quantities. The use of variable frequency drives (VFDs), which control fan speed, provides a solution to this problem. VFDs are already used in various similar applications such as pumping and building ventilation. New technology now enables efficient VFD operation in …
-
Analytical and Experimental Investigation of Torsional Vibrations in Variable Frequency Drive Controlled Induction Motor Driven Machinery
… for preventing resonance related failures. Variable Frequency Drives (VFDs) are increasingly used to control the speed of induction motors, offering operational flexibility but also introducing undesirable torque harmonics. These harmonics, generated by the interaction of switching and …
-
Analysis and Simulation of Mechanical Trains Driven by Variable Frequency Drive Systems
Induction motors and Variable Frequency Drives (VFDs) are widely used in industry to drive machinery trains. However, some mechanical trains driven by VFD-motor systems have encountered torsional vibration problems. This vibration can induce large stresses on shafts and couplings, and reduce the …
-
Strategic Roadmapping and Technology Portfolio Selection for Heating Decarbonization in Canada
… heat exchangers, and circulation pumps with variable frequency drives. Critical supporting technologies identified encompass building information modeling integration kits, cybersecurity modules, digital permitting platforms, smart thermostats, and thermal energy storage systems, among …
-
Development of new methods for nonintrusive induction motor energy efficiency estimation
… its losses and efficiency while inservice. As Variable Frequency Drives (VFDs) continue to dominate industrial process control, there is a need for stakeholders to quantify the converter-fed motor losses over a wide range of operating frequency and loading conditions. Although there is an …
-
Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
Adjustable speed drives (ASD) are one of the major load components in power systems and with the advent of wide band gap devices, which provide efficiencies greater than 95%, variable frequency drives will continue to grow and integrate into the systems. ASDs serve a varied set of processes …