Understanding the significance of efficiency improvement in an electric vehicle drivetrain system and the prospects of multi-phase electric motors, this paper discusses research findings elicited ...through a comparative performance analysis performed on commercially available in-vehicle conventional three-phase permanent magnet motor and modified dual stator winding permanent magnet motor derived from the conventional three-phase machine. Various electrical losses in both the machines have been estimated and compared through developed mathematical approach using analytical equations. The study performed here is exclusive to estimate the electrical losses in a multi-phase permanent magnet machine and provide decision points on various structural design indices of the machine before venturing into the FEA based machine design and assessment.
Transit agencies are increasingly focused on making bus fleets cleaner, more efficient and cost effective by incorporating new clean propulsion technologies. Increased maintenance cost and lower ...lifetime of battery packs in existing hybrid electric buses have been major bottlenecks in motivating transit bus operators to rapidly switch to this energy efficient technology. Understanding the demerits of the current battery based energy storage technology and merits of the prospective flywheel based energy storage technology for transit bus application, this paper puts an effort to study the permanent magnet synchronous machine based flywheel energy storage system for the aforementioned application. A series transit hybrid bus with peaking vehicle control strategy has been taken into consideration with a macro objective to compare the performance of the battery based and flywheel based hybrid transit bus in terms of fuel consumption and cost of the installed system. However, the focus of this paper remains on the development and study of a 100 kW flywheel energy storage system based on vector control technique which forms the first step towards this macro objective.
Drive initiated active symmetrical short circuit (SSC) of motor phases is used as a protection method in electric vehicle (EV) drives during abnormalities. This paper exclusively investigates the ...effects of wound field synchronous machine (WFSM) stator and field circuit parameters, currents and control methods on its dynamic performance during a forced SSC fault. This paper employs a novel coupled circuit-based control model that represents the stator subsystem in two-axis model and the field exciter and rotor circuit as physical variables to capture the transient response during freewheeling action towards predicting both steady-state and transient responses of a WFSM to 3-phase SSC faults. Stator non-linear inductances, resistances, stator current angle, field current magnitude, and rotor field winding parameters are included in the model, thus making it comprehensive for performance analysis in WFSMs. Behavior of stator and rotor currents during SSC is analyzed at different pre-fault conditions when the WFSM is controlled using total- and rotor-loss minimization control schemes. Results obtained using the developed model are verified and compared with results obtained from numerical simulations based on finite element model and experimental tests conducted on the test machine.
Too much dependence on large, polluting and expensive generation is no longer an option that Canadians would endorse in this era of distributed generation through renewable energy systems. ...Understanding the significance and prospects of self-excited induction generators (SEIGs) in distributed wind power generation, this paper presents an exclusive study of fault and a artificial neural network (ANN) based technique for its detection across the stator terminals of the SEIG. Firstly, two-axis model of a 7.5 hp industrial copper-rotor SEIG is developed to perform numerical investigations under static loading conditions, faulty conditions and hence derive data for designing the ANN based detection scheme. Fault tolerant capability of the machine is experimentally elicited by applying a short-circuit fault across the terminals of the machine and the need for fault detection in the SEIG system is discussed. Lastly, a novel ANN based scheme is developed for fault detection and numerical investigations are performed to illustrate the performance of the developed scheme. This paper aims to provide a good study to understand and develop a ANN based device for fault detection in a SEIG system.
Understanding the significance and prospects of self-excited induction generators (SEIGs) in wind energy application, this paper elucidates the significance of incorporating the proximity effect in ...the conventional model of SEIG. An analytical model to incorporate the proximity effect in the rectangular rotor bars of the SEIG is developed and built into a computer program to elicit the accuracy of the developed SEIG model. The calculated results are experimentally verified in the case of two 7.5 hp aluminum- and copper-rotor SEIGs under static loading conditions, through an exclusive qualitative analysis of real and reactive power profiles and rotor copper losses, as a function of the proximity effect.
The usage of niche copper-rotor induction motor (CRIM) in the Tesla Roadster electric vehicle has bolstered the technology of using copper-rotor induction motor for electrified transportation. ...Understanding the merits, demerits and state of art technology of induction motor and its drive in EV/HEV application, this research manuscript proposes an online stator and rotor resistance estimation scheme using particle swarm optimization (PSO) technique for efficient and accurate control of induction motors in the same application. Firstly, an insight is provided on the state or art CRIM technology in EV/HEV and the need for reliable online rotor and stator resistance estimation scheme. Secondly, a PSO based scheme for resistance estimation is developed through a mathematical model. The developed model is validated and tested on a 10hp CRIM thorough a computer programme. Thereafter, the calculated results obtained from numerical investigations are analyzed.
