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In this paper, we analyze the back electromotive force (BEMF) characteristics according to the magnetization pattern of irreversible demagnetization to determine the fault type for interior permanent-magnet (IPM) type brushless DC (BLDC) motors. We numerically model irreversible demagnetized PMs using space-harmonics analysis. In addition, we analyze the results using the finite element and analytical...
The purpose of this paper is to characterize the performance of a novel dual-stator six slot four pole (6/4) flux switching permanent magnet machine. The proposed dual-stator 6/4 topology eliminates even order harmonics in the flux linkage and back electromotive force, which are present in the conventional single stator topology. The resulting back electromotive forces of the proposed dual-stator...
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...
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...
This paper discusses various transient trajectories for increasing the magnetization state (MS) of variable flux permanent magnet synchronous machines (VF-PMSMs), a class of PMSM where the magnets are demagnetized and remagnetized using the drive inverter during drive cycle operation. To manipulate MS, a magnetizing current pulse can be used, which may drive a large amount of flux linkage in the machine...
The paper describes an improved method to control a Pseudo Direct Drive (PDD) permanent magnet machine with only one sensor on the low-speed rotor (LSR). Due to the magnetic coupling between the two rotors, the PDD machine exhibits low stiffness and non-linear torque transmission characteristics, and hence, the position of the high-speed rotor (HSR) cannot be determined using simple gearing ratio...
The Fractional Slot Concentrated Winding (FSCW) configuration increases spatial harmonics of the magneto motive force (MMF) waveform of an electric machine. Therefore, saturation level in such machines is typically higher than that of the conventional machines with distributed windings. Since the characteristic of Interior Permanent Magnet (IPM) machine principally depends on inductances variation,...
Wireless power transmission (WPT) using magnetic resonance has been attracting increasing attention from power electronics engineers and industry. A number of studies have investigated WPT circuits based on magnetic resonance and have verified the high-efficiency power transmission characteristics of such circuits. However, a 10-MHz-class high-frequency power supply suitable for high-power transmission...
Brushless doubly fed induction generator (BDFIG) eliminates the slip rings and brush gear and thus having the benefit of high reliability and low maintenance costs, which shows commercial promise for either grid-connected or standalone power generation. This paper proposes a new field-oriented control method for a BDFIG in stand-alone application. The proposed control system is oriented with the control...
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...
The demand of high power Continuous Conduction Mode (CCM) Power Factor Correction (PFC) converter installed in charging devices for Electric and Hybrid Vehicles has grown in the recent years. In these converters, the inductor often appears as the largest component, consequently, the CCM boost PFC converter using coupled inductors is well-known as one of the topologies that can achieve miniaturization...
This paper describes mid-range electrical resonance wireless power transfer in kHz range. Wireless power transfer using electrical field is minor since this method is understood only for close-range applications. However, our experimental units, the resonance frequency of which is 85 kHz, achieved 180 mm distance power transmission by vector network analyzer (VNA) measurement while keeping peak efficiency...
A new compound-excited doubly salient brushless dc (DSBLDC) generator with power tracking rectification is proposed, which is constituted by a doubly salient electromagnetic machine (DSEM) with split field windings and a simple switched-mode rectifier. The configuration and operation principle are introduced. The inductance features of the generator are analyzed for the utilization of series field...
As the number of power electronics based systems are increasing, studies about overall stability and harmonic problems are rising. In order to analyze harmonics and stability, most research is using an analysis method, which is based on the Linear Time Invariant (LTI) approach. However, this can be difficult in terms of complex multi-parallel connected systems, especially in the case of renewable...
During the dynamic test of high power switching devices, it can be challenging to measure both high speed and low amplitude signals accurately. This paper uses fast response on-die temperature sensing as an example to investigate the electromagnetic interference control of a typical double pulse test (DPT) setup. Three common noise sources are identified: 1) Conductive common-mode noise caused by...
This paper examines high speed performance of a permanent magnet (PM) machine with a reconfigurable winding (RW). First, the variations of machine parameters due to winding reconfiguration are presented and their impacts on drive system performance are investigated. To further understand system behavior, the reconfigurable ratio is set as a variable, and its effect on saliency ratio, flux weakening...
For energy conversion systems that require bidirectional energy transfer between two DC sources, the generally preferred converter topology is a Dual Active Bridge (DAB), particularly when galvanic source isolation is required. However, for maximum efficiency the two bridges should operate under Zero-Voltage-Switching (ZVS) conditions, and hence it is important to be able to accurately identify this...
Multi-coil links are generally introduced to improve the efficiency and extend the energy transmission distance. However, most of them are relay solutions which are equivalent to reduce the distance. In this paper, two kinds of 3-and three kinds of 4-coil links unchanging the energy transmission distance are proposed respectively. Among these links, by comparing the characteristics, the appropriate...
In this paper a design approach for a sensorless controlled, brushless, interior permanent magnet machine is attained. An initial study based on established electrical machine formulas provides the machine's basic geometrical sizing. The next design stage combines a particle swarm optimisation (PSO) search routine with a magneto-static finite element (FE) solver to provide a more in depth optimisation...
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