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In modern automotive drive applications, Electrically Excited Synchronous Machines (ESM) have become an alternative to PSMs. Until now, ESMs need slip-rings to supply the rotor winding. However, carbon brush slip-ring systems are sensitive to environmental influences and produce conductive carbon dust during operation. This paper discusses the construction of a contactless energy transfer system to...
Permanent magnet synchronous machines with tooth concentrated windings are widely used in today's hybrid electric vehicles (HEV). This is due to several well-known advantages provided by concentrated windings. Nevertheless, excessive heat generation in the rotor, caused by magnet losses, continues to be a major challenge for vehicle manufacturers. Usually magnet segmentation is proposed to meet the...
Nowadays, high power density has become essential in networking, telecommunications and computing applications. Additionally, the electronic equipment used in these applications requires a very-low voltage feeding even when its power supply has a much higher voltage rating. Therefore, high step-down converters with high power density performance are required for these applications. Consequently, a...
Single-phase Field Excitation Flux Switching Machines (FEFSMs) are increasingly considered as suitable candidate for high speed applications due to their variable flux capability and single piece structure of rotor. However, most of existing FEFSMs have overlap windings between armature and field excitation coil (FEC) which lead to increased size of motor, copper losses as well as material costs....
An improved quasi-z-source dual-inverter for open-end winding induction motor drives is presented in the paper. The improved quasi-z-source dual-inverter can not only realize boost/buck function, but also suppress DC-link bus overshoot voltage, which is suitable for medium/high-power level. The topology allows shoot-through state, so that the dead-time effect cannot be existed. The dual-inverter belongs...
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...
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...
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...
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...
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 deals with the performance assessment of different permanent magnet motor drives topologies for Starter/Generator in More Electric Aircraft systems. The comparison is focused on the power electronics part of the system, assuming the possibility to adapt the machine structure to better fit the specific configuration. Simulations performed with Matlab/Simulink and Plexim Plecs will be used...
This paper presents a detailed state-space modeling of a Modular Multilevel Converter (MMC) in combination with line frequency transformer (LFT). The classical MMC topology is compared with the recently proposed Open-End Winding MMC (OEWMMC) topology, which integrates the LFT in the converter arm. The line frequency transformer parameters are added in the model, some of which are often neglected in...
Inductive power transfer (IPT) systems developed rapidly in the last years. Nowadays, IPT systems are widely used in a variety of applications, such as automated guided vehicles, electric vehicles, or buses. Within this broad range of applications, IPT systems vary significantly in capacity, in their range of air gap, and in their maximum lateral displacement. In order to take these requirements of...
This paper designs two six-phase hybrid-excited flux-switching (HEFS) machines with E-core and C-core stator laminations, respectively, for electric vehicles (EVs). The iron bridges are adopted in stators to simplify the manufacturing process. First of all, focused on the flux-regulation capabilities, the steady-state and torque-speed (T-n) characteristics are discussed. Especially, the phenomenon...
In this paper, axial-flux permanent magnet machine is modelled to precisely imitate static eccentricities. From the model, the effect of the non-uniform airgap permeance which arises from static eccentricities on current harmonics and torque is experimentally studied. The influence of two cogging torque minimization techniques on both signatures, in the presence of static eccentricity is also examined...
The Modular Multilevel Converter (M2LC) is a well-known modular multilevel topology. This paper proposes a novel branch inductor coupling and compares it to the center-tapped inductor and the standard non-coupled inductor topology. The proposed coupling has a significant influence on the inductor and converter dimensioning. Its properties make it especially well-suited for use in M2LC single-to-three-phase...
This paper examines the performance benefits of four IPM drive system configurations for HEV/EV applications with the following features for controlling the machine voltage: 1) boosted inverter, 2) Y/Δ, 3) series/parallel (S/P) and 4) tapped reconfigurable windings. The four systems are modeled and their impact on drive system performance is investigated. Additionally, comparisons in terms of flux...
Two new topologies of three-phase segmented rotor switched reluctance machine (SRM) that enables the use of standard voltage source inverters (VSIs) for its operation are presented. The topologies has shorter end-turn length, axial length compared to SRM topologies that use three-phase inverters; compared to the conventional SRM (CSRM), these new topologies has the advantage of shorter flux paths...
This paper presents an analysis of the capacitor voltage stability for a stacked polyphase bridges (SPB) type converter. The SPB converter comprises of several submodules which are connected in series. Therefore, stability of the dc-link voltage is very important to investigate. From the analysis, a corresponding controller and an analytical expression for stability are derived. The proposed controller...
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