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The stray magnetic field around inductive-power-transfer coils is influenced by the phases of the transmitter's and receiver's currents. This influence is analyzed with the diagrams of phasors for the currents and magnetic fields. The dual-side-controlled converter is applied for the circuit realization, in which the bridges with MOSFETs are used for the inverter on the transmitter side and rectifier...
This paper proposes a power factor correction method of a non-resonant IPT system using a four-winding transformer. The proposed technique is applied to the IPT system with a dual active bridge converter to reduce conduction loss and winding loss. When two pairs of the primary-side and the secondary-side wires are connected in parallel, the low coupling coefficient between the wires driven by in-phase...
Axial Flux Permanent Magnet (AFPM) motors of two types, coreless and conventional topologies, have been studied in order to identify their merits and drawbacks at different ratings, particularly for in-wheel electric transportation applications. The performance of the coreless with several slotpole combinations and number of disks is evaluated. Design of experiments (DOE) methodology is utilized to...
This paper analyzes the stator windings turn-to-turn fault tolerant capability on inverter-fed permanent magnet (PM) machines. By adding a secondary neutral point (NP) in stator windings, both the fault detection and tolerant capability can be improved considering a small turn-to-turn short at early stage. From the perspective of fault detection, the proposed two NP's windings increase the equipment...
Axial flux permanent magnet (AFPM) synchronous motors are attractive for low speed direct drive systems because of their high specific torque. The present paper proposes a novel axial flux machine topology, called MAGNUS, obtained by combining a yokeless central stator type NS arrangement with two external high polarity spoke-rotors, resulting in very high flux concentration. The stator, which includes...
Wound rotor synchronous machines have gained popularity as an alternative to permanent magnet synchronous machines and methods to improve the efficiency of these machines are continuously sought after. At the same time, non-overlap windings have gathered ground because of its associated lower cost and good torque density. However, non-overlap windings are also characterized by relatively high sub...
This paper proposes a system that can actuate itself with wirelessly received power. The system consists of two coils with different purposes; the power-receiving coil wirelessly receives power from the external sinusoidal magnetic field, and the actuation coil controls the current for 1D self-actuation. The actuation current has a square waveform and is controlled to be in phase with the external...
In a magnetically coupled resonant (MCR) wireless power transfer (WPT) system, adding repeating coils is an effective way to lengthen transmission distance and improve the transferred power in a wide range. This paper investigated a 3-coil MCR WPT system. Based on fundamental harmonic analysis on the equivalent circuit model, the relationship between the transmission characteristics and the spatial...
Simultaneous non-contact energy transmission for multiple loads with separate receiving coils is a remarkable advantage of magnetically coupled resonant (MCR) wireless power transfer (WPT). Nevertheless, diverse energy requirements of different loads and efficiency quota make it considerably difficult to design and optimize the parameters of present single-frequency system. In this paper, a novel...
Omnidirectional wireless power transfer (WPT) system has been studied recently due to its better user experience compared with directional WPT system. And this paper focus on resonant converter topologies study in omnidirectional WPT system. At first, three challenges of resonant converter design are identified: I. moving resonant frequency under variable coupling condition; II. voltage controllability...
This paper proposed a novel multiplexing module based on LCL topology for dynamic wireless charging of electric vehicles. The LCL compensation network is widely used due to its insensitivity of output characteristics to load variation. But the design of an LCL topology requires a compensation inductor with the same value of a transmitter. The proposed multiplexing LCL module (MLM) can make the primary...
This paper presents a new magnetic coupler design that interconnects the plug-in isolated topologies with the Inductive Power Transfer (IPT) technology for onboard Electric Vehicles (EVs) batteries charging systems. The proposed design acts as an isolation transformer during the charge in plug-in mode, and as a conventional magnetic coupler in IPT charging mode. In this way, the system requires only...
In this digest, a coupling coefficient estimation method for wireless charging system is proposed based on its transmitter and receiver current and voltage harmonics analysis. One of the main challenges of wireless charging in vehicular application is the significant variation of magnetic coupling coefficient between transmitter (Tx) and receiver (Rx) coils due to large air-gap and lateral misalignment...
To help mitigate some of the challenges associated with the wide spread adoption of the stochastic wind power, wind turbine with full-scale power converter (Type D) is preferred. Since full power is processed by the power converter in a type D wind turbine, it is important to improve its efficiency and reduce the cost per kW to achieve lower cost of energy. The power produced by the wind turbine varies...
In most loosely coupled inductive wireless power transfer systems, the air-gap magnetic flux density between coils is still far above safety limit, which is a potential threat to human beings and animals. In addition, less attention is paid to the air-gap electric field intensity, which increases significantly as the operating frequency increases. In this paper, a multi-kW inductive wireless power...
Resonant energy link plays a vital role in the performance of inductive wireless power transfer (IPT) system, whereas the effective design method has not been actively investigated from a perspective of power conversion circuit. This paper presents a new graphical design method based on FOM-rd plane which gives convenience as well as insight to circuit designers. The proposed FOM-rd plane can estimate...
This paper proposes a primary side control for series-series compensated wireless power transfer system. By eliminating the need for a communication link for signal feedback, the control method not only reduces volume and cost of the system, but also improves a dynamic response. This controller only requires the information of the primary side voltage and current to identify the load resistance and...
The novel doubly salient slot permanent magnet linear machines (DSSPMLMs) are proposed in this paper. First, the topology and geometric parameters of the DSSPMLMs with 12 slots are introduced, and the corresponding basic operating principle is investigated. Then, feasible slot/pole combinations and winding configurations are further analyzed. To the DSSPMLMs with 12 slots, all structures with 10/11/13/14...
Techniques of long-term in-vivo electrophysiological recording play important roles in brain research and neural rehabilitation. To avoid interruption of experiment and risk of infection, use of wireless power transfer (WPT) technique has recently been suggested to eliminate cumbersome wires and batteries attached to the animals in rodent electrophysiological applications. This paper presents a holistic...
In order to achieve high efficiency, IPT systems must work under resonance conditions. Since, the coupling coefficient is low (k<0.5) compared to a transformer, the compensation is done separately in the primary and the secondary sides. However, depending on the system, both systems can alter each other, creating pole-splitting or bifurcations. This paper presents a design criterion to ensure that...
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