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Machines with modular structure significantly simplify the manufacturing process, particularly the stator winding, and highly increase the slot fill factor. The non-overlapping concentrated winding, or single tooth winding, is the most compatible winding layout with segmented structure. This technology is well-established for permanent magnet family machines. However, their incompetence to produce...
This paper presents the synchronous operation of a novel generator termed as the rotating power electronic brushless doubly-fed induction generator (RPE-BDFIG). It is shown that the generator operates well at the synchronous speed of the main machine, delivering the desired power to the grid. Furthermore, it is illustrated that the RPE-BDFIG behaves similar to a synchronous generator in the synchronous...
Stator winding inter-turn fault is a common fault in induction machines. A substantial number of works have been developed for detection of this fault; however, there are only a few works on fault parameter estimation and faulty phase identification. In particular, there have been no works dealing with estimation of fault loop resistance. This paper presents a method for estimating the fraction of...
This paper presents a new three phase single tooth concentrated winding topology. With the new locally asymmetric configuration, each individual harmonic can be addressed, so operations with any number of pairs of poles are possible. Furthermore, the new arrangement of single coils presented here allows variations of winding characteristics such as winding factor, spectrum of the magnetomotive force...
This paper deals with the validation of a simplified first order thermal model in machine operative conditions for the prediction of the winding temperature during overload duty. The machine used for the model validation is a 10 kW automotive starter-generator prototype for mini-hybrid powertrain. The functionalities required to the machine are mainly transitory operative conditions such as engine...
Direct torque control (DTC) is extensively used in conventional three-phase drives as an alternative to field-oriented control methods. The standard DTC technique was originally designed to regulate two independent variables using hysteresis controllers. Recent works have extended the procedure for five-phase drives in healthy operation accounting for the additional degrees of freedom. Although one...
Multiphase variable-speed drives' advantages such as fault tolerance and better power-per-phase splitting make these electromagnetic devices suitable for high reliability applications. However, the applied control techniques require accurate knowledge of the electrical parameters of the machine. Although a large number of modulation and control strategies have been proposed, little work has been focused...
Although Single-Sided Linear Induction Machines (SLIMs) have been analyzed and tested intensively as prime movers for different applications in literature, their application for energy harvesting has not been studied rigorously. This paper investigates the use of SLIMs for watt-range energy harvesting from a moving steel body with smooth surface (solid steel secondary) in order to supply control electronics...
In the wind power application, different asymmetrical types of the grid fault can be categorized after the Y/d transformer, and the positive and negative components of a single-phase fault, phase-to-phase fault, and two-phase fault can be summarized. Due to the newly introduced negative and even the natural component of the Doubly-Fed Induction Generator (DFIG) stator flux during the fault period,...
Among multiphase machines of different phase numbers, six-phase machine is one of the most popular and widely studied multiphase machine. By displacing the two three-phase windings with an angle of 30 degrees, 60 degrees or 0 degree, the machine can be configured as an asymmetrical six-phase, symmetrical six-phase or dual three-phase machine respectively. At the same time, the stator windings can...
Energy production or critical applications need fault tolerant operation. Six-phase induction machine (SC6PIG) increases the reliability by allowing the loss of up to 3 phases. Associated with a relevant novel control able to adapt itself to the new configuration, operation can keep on under fault. A novel strategy of control is here proposed with sensorless control. This strategy nonetheless focus...
Modern variable-speed induction machine drives are widely used in traction applications such as hybrid or fully-electric road vehicles despite their lower efficiency compared to interior permanent magnet synchronous machine drives. The machine terminals are fed by a voltage source inverter that implements a field-oriented current control. The rotor flux and torque producing current component can be...
In the first part of the paper, a complete model to describe the unbalanced operation of five-phase induction machine is presented. To show the application and validity of this model, in this second part, it is applied to study two typical cases: voltage unbalance and loss of one stator phase. The data used here refer to a five-phase prototype machine of 5.5 kW. Special attention is given to those...
This paper proposes a sensorless stator flux observer for the direct torque control (DTC) scheme of interior permanent magnet synchronous motors (IPMSMs) drives in the very low speed region including standstill. The stator flux observer comprises the voltage model augmented by the current model. The position information required by the current model is obtained by a separate rotor position estimator...
Two low-power High-Speed Permanent Magnet Synchronous Machines (HS PMSM) are reviewed. The powers and speeds of the machines are 3.5 kW at 45 000 rpm and 11 kW at 31 200 rpm. Both machines under consideration have 6 slots and 2 poles and they are both using Tooth-Coil (TC) windings also known as non-overlapping concentrated windings. The rotors of the discussed machines consist of the diametrically...
An advanced control strategy of a variable flux vernier reluctance machine is proposed to improve efficiency and load capacity in this paper. Distinguished with traditional vernier machines, this machine has a novel doubly salient structure with DC field-exciting windings in stator slots. Losses of this machine are produced in both three-phase armature windings and DC windings, which occasionally...
Potential benefits of Integrated Motor Drives (IMD) include increase in power density, reliability and efficiency. These benefits are particularly valuable in Aerospace and Automotive applications. However, close physical integration of the drives and the machine may also lead to an increase in component temperature. This requires careful thermal analysis and coupled design of the IMD system. This...
This article is about measurement-based modeling of PMSMs. Typically, these machine designs feature nonlinear characteristics regarding the stator phase currents and show rotor angle dependent behavior. Thus, non-sinusoidal linked fluxes as well as higher torque harmonics occur. As this cannot be represented by classical dq0-based theory, a feasible modeling strategy had do be established and its...
This paper presents a design of a two-pole high voltage induction machine with concentrated coils wound on twelve stator teeth. Using a combined wye-delta winding a magnetomotive force distribution with a low content of space harmonics is created. For suppression of still existing undesirable slot harmonics, a special interconnection of rotor bars is examined. In addition to the design with a finite...
This paper explores a topology of induction machine drive with a novel concept of a wound rotor fed by a converter with a floating DC-link capacitor. The Y-connected stator windings are connected to the grid, while Y-connected rotor windings are connected to a three phase converter with a floating DC-link capacitor. By integrating the converter into the wound rotor, the slip-rings and the brushes...
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