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In order to design and fabricate low profile (slim) LLC resonant converters, it is essential to replace conventional wire-wound magnetic transformers with low profile planar ones. In planar transformers, to decrease high-frequency AC resistance and to get high power efficiency, the primary and secondary PCBs are stacked together using the interleave structure method, which leads to a high amount of...
This paper presents four nine-phase drive systems. A nine-phase machine is connected to four converters in an open-end winding arrangement, with one of the converters being shared by all machine groups. Because of the shared converter, the structures are only applied for machines with α = 0°. A PWM strategy is discussed in order to reduce machine torque ripple. Simulation and experimental results...
This paper presents a new adjustable speed drive (ASD) topology that employs medium frequency (MF) transformer isolation. The proposed system consists of a new 3-phase push-pull based AC to DC rectifier with a MF AC link employing only two active switches. A single 5-limb multi-winding MF transformer is employed for isolation. The secondary side of the transformer is connected in a zig-zag configuration...
Inter-turn short-circuit faults that occur inside stator coils are difficult to cope with compared to terminal short-circuit faults. A general analytical model for inter-turn short-circuit faults is developed that employs a novel T-type equivalent circuit. When this model is used to investigate the impact of inter-turn short-circuit faults in PM machines with fractional-slot concentrated windings...
The increasing load, increasing level of penetration of renewable energy and limited investment in transmission infrastructure have significantly increased the need for a smart, dynamically controllable grid. This paper proposes a power flow control device to maximize asset utilization, improve reliability, and reduce congestion. To ensure low cost of implementation and high reliability, the technology...
The need for a low-cost, high reliability power flow control technology is becoming exceedingly clear in the face of increased renewable penetration and electrification of automobiles. This paper proposes a power routing technology called the compact dynamic phase angle regulator (CD-PAR) for dynamic control of active/reactive power. The proposed device is a hybrid solution realized by pairing a fractionally-rated...
The thermal conductivity between winding and lamination is one of the most critical parameters in electrical machine thermal analysis. Its value depends on the insulation materials and on the manufacturing process of the winding system and for this reason cannot be computed using analytical equations. In this paper a practical investigation on equivalent thermal conductivity of electrical machines...
The concept of Double-Delta Sourced Transformer (DDST) had been proposed to eliminate passive filters in large-scale power conversion systems. For the grid connection, active and reactive powers in DDST must be under control. In this paper, the power modulation method is proposed for DDST through the current regulation. And, it is also considered when one of converters is disconnected from the transformer...
For Electric Vehicles (EV) using on-board charger, the power density and efficiency of its charger are closely related to the technical and economical restriction of the overall system. In this paper, an integrated LLC resonant converter using center-tapped transformer is proposed to improve the power density of the EV charger. The accurate model of integrated LLC resonant converter considering leakage...
A switched reluctance machine (SRM) is applicable to high speed applications due to its simple magnetic structure and mechanical robustness. During the operation of a converter, however, it causes high peak phase current which leads to a rise in the VA rating of an SRM system. Therefore, this paper investigates the reduction of peak phase current and describes the basic design procedure of an SRM...
On-silicon coupled inductors with integrated magnetic material offer improved voltage regulator performance particularly in high power density applications such as microprocessor power delivery. The on-silicon coupled inductor designs reported in literature typically use single layer metal for winding deposition. In this paper we report on design, optimization and fabrication of two on-silicon coupled...
There is a need for microinverters that support non-unity factor operation in response to recently issued regulations. In this paper, a topology is proposed for a low cost and efficient single phase microinverter that can supply reactive power. The microinverter is controlled to ensure smooth current flow to/from the grid where a three-stage operation is used. Despite their low complexity, the proposed...
Aiming to increase vehicle performance, a method for thermal monitoring of critical drive components is presented. Using the example of an integrated starter-generator (ISG), with integrated clutch module and an internal combustion engine (ICE) attached, a finite element method-based thermal model is introduced. Based on this numerical model, which is verified using measurements, the thermal behavior...
This paper proposes a dual-rotor, toroidal-winding, axial-flux vernier permanent magnet (VPM) machine. By the combination of toroidal windings with the rotor-stator-rotor topology, the end winding length of the machine is significantly reduced when compared with the regular VPM machine. Based on the airgap permeance function, the back-EMF and torque expressions are derived, through which the nature...
Brushless Doubly-Fed Induction Generator (BDFIG) is potential for power generation applications for its high reliability and low maintenance-cost. There are two operation modes for BDFIG: grid-tied and stand-alone modes. The grid-tied mode usually uses the power winding (PW) synchronous and orientation frame since PW is connected to the grid; however in stand-alone mode, the PW is connected to the...
In this contribution the concept of a multi-tap transformer topology for SS-compensated Inductive Power Transfer (IPT) systems is proposed. The objective is an improvement in terms of overall efficiency and maximum tolerable misalignment of the secondary transformer coil that is assumed to be mounted underneath an electric vehicle (EV). In a first step mathematical expressions are derived to describe...
In this paper, a five-phase hybrid-excitation flux-switching (HEFS) machine with “E”- core stator cell is proposed and analyzed. The topology and operation principle are investigated. Moreover, the armature winding connection method is analyzed and the analytical sizing equations are derived to determine the main design parameter of HEFS machine. The electromagnetic performance, including the conventional...
A novel three-phase, concentrated winding, axial flux, segmental rotor, flux-switching synchronous motor is presented. The proposed topology has rotor segments made of only iron laminations and operates with flux-switching principle. Compared to existing axial flux permanent magnet (AFPM) topologies, the proposed machine contains reduced amount of permanent magnets located only in its stator. This...
This paper proposes a dual-loop voltage control for optocoupler feedback in capacitive output filter converter to mitigate the detrimental effect of the optocoupler on regulation performance. The dual-loop consists of primary-side regulation (PSR) loop and reference voltage correction loop. PSR loop performs output voltage regulation with indirectly sensed output voltage across tertiary winding of...
The design of power magnetic components for operation at high frequency (HF, 3–30 MHz) has been hindered by a lack of performance data and by the limited design theory in that frequency range. To address these deficiencies, we have measured and present core loss data for a variety of commercially available magnetic materials in the HF range. In addition, we extend the theory of performance factor...
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