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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...
Multiple dipole receiving (Rx) coils, which are applicable to ubiquitous mobile device charging applications, are newly proposed in this paper. By using the proposed Rx coils, any mobile devices equipped with the proposed Rx coil can be freely charged regardless of direction anywhere and at any time in wireless power zone, where a uniformly distributed magnetic flux environment is provided for wireless...
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...
Single phase IMs have been widely used in home appliances such as fans, pumps and so on because they are directly driven by commercial AC power supply. However, the motor efficiency is very low because the rotor winding and auxiliary winding generate large copper loss. Therefore, in this research, a novel single phase switched reluctance motor (SRM) which is directly driven by commercial AC power...
Condition monitoring of permanent magnet synchronous motors (PMSMs) is the process that identifies and averts impending faults and is of critical importance for reliability and robustness of overall system. In this study, magnet defect fault in PMSMs and the consequence effects of such failure on stator back-emf and current wave forms are investigated through modified magnetic equivalent circuit (MEC)...
Crossed dipole coils for the wide-range 3-D omnidirectional inductive power transfer (IPT) are proposed. Free positioning of a plane receiving (Rx) coil is obtained for an arbitrary direction within 1m from a plane transmission (Tx) coil. Both the Tx and Rx coils consist of crossed dipole coils with an orthogonal phase difference; hence, a rotating magnetic field is generated from the Tx, which enables...
Previous work reveals that the magnetically coupled resonant (MCR) wireless power transfer (WPT) technology is efficient and practical for mid-range wireless energy transmission, able to handle nontrivial amount of power. This paper presented an equivalent analytical model for MCR WPT system to incorporate spatial misalignments between the transmitting coils and receiving coils. The mutual inductance...
Solving a short mileage and a long charging time is indispensable to putting electrical vehicles (EVs) on the full-scale market. A moving wireless power transfer (WPT) system is one of the effective solutions, because it can feed electric power to moving EVs. This paper proposes a moving WPT system consisting of several stationary ground-side (primary) coils and a moving vehicle-side (secondary) coil...
This paper puts forward a concept for measuring rotor eccentricity in an wound rotor induction machines. The analysis is fully developed in the theory section then an experimental rig is described and measurements taken. These are compared to the calculated values. Using pole-specific search windings are necessary in a wound rotor machine because standard sideband current measurement techniques are...
This paper presents design studies of an integrated electrical drive employing a wound field flux switching motor (WFFSM) coupled with a Z-source inverter (ZSI). The WFFSM has field excitation coils as dc field mmf sources locate at the stator body. On the other hand, the ZSI works as a three-phase inverter with voltage boost function by adding a switching device and an impedance-network. The impedance-network...
In this paper a highly reliable and compact inverter is proposed. This inverter is capable of both stepping up and stepping down the voltage and can be used for inductive wireless power transfer. The proposed inverter is an extension of the dc-dc Ćuk converter; therefore, a capacitor that forms the link is responsible for transferring the power from the input towards the output. The converter is designed...
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...
In this paper a grid compliant variable-flux PM generator topology for wind turbine applications is proposed. An analytical comparative study of a series-double excited synchronous generator and an electrically excited synchronous generator (SG) is carried out with particular focus on the amount of MMF required to satisfy grid codes. A finite element based design optimization of the proposed generator...
This paper presents results from a design study into a brushless PM starter-generator. The automotive application demands a low-cost solution within a highly constrained mechanical space-envelope. Material costs are reduced through the use of ferrite permanent magnets and aluminium conductors. Design challenges include the selection of an appropriate machine topology to realise a high specific output...
This paper presents a novel prototype of a timesharing frequency doubler principle-based current-fed zero current soft-switching (ZCS) high frequency resonant (HF-R) inverter for inductive power transfer (IPT) systems. The newly-proposed ZCS HF-R inverter is suitable for producing a higher frequency resonant current with switching power loss reduction by using a middle-class switching frequency insulated-gate-bipolar-power...
This paper presents the design procedures of an unity-power-factor AC-DC power converter for wireless power transfer application. This newly proposed AC-DC converter consists of two stages: the PFC front stage uses LC series resonant circuit to perform power factor conditioning and the second stage uses a DC-DC converter to regulate the output voltage. New equations to describe the input impedance...
In this study, analysis of a bi-directional half-bridge inverter for wireless power transfer applications is realized. The presented converter topology is explored to reveal the maximum efficiency points with a variable phase shift function between the dual active bridge (DAB) switches. The examination of the converter is provided in terms of variable load and coupling co-efficient factor at a constant...
Traditional in-motion (dynamic) wireless power transfer (WPT) is based on elongated power transmitting tracks. It suffers from low efficiency, having complex and not fully utilized magnetic structures, among other drawbacks. In the case of lumped transmitter coils commeasurable in size with the receiver coil, which has been recently proposed for the in-motion WPT, the power transfer is intermittent...
Commonly, reconfiguring the winding in order to modify the torque-speed characteristic can be achieved by changing the coils configuration from series to parallel. This may produce an unwanted voltage unbalance between parallel conductors and circulating currents may appear. These currents produce losses that are usually neglected but they become significant the more the motor rotates rapidly. In...
Losses are often a limiting factor for the application of bearingless motors, especially at high rotational speeds. In this paper the loss mechanisms in slotless bearingless disk drives with toroidal windings are identified and analyzed. Although the slotless topology already features comparably low losses, a detailed comprehensive analysis of the loss portion enables a further reduction of these...
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