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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
Applying wireless power transfer (WPT) to transportation applications is one of the best solutions to overcome drawbacks of a limited energy souse in electric vehicles (EVs). Although dynamic charging of EVs can extend their driving distance, control techniques have to be further developed to maintain maximum transmitting efficiency because of parameters variation, e.g. distance change and load change...
Provides an abstract for each of the keynote presentations and a brief professional biography of each presenter. The complete presentations were not made available for publication as part of the conference proceedings.
Provides an abstract for each of the tutorial presentations and a brief professional biography of each presenter. The complete presentations were not made available for publication as part of the conference proceedings.
New coreless transmitting (Tx) coils with conductive metal shield for wide-range ubiquitous inductive power transfer (IPT) zone, i.e., U-IPT zone, are proposed in this paper. Because commercialized IPT systems are only available for short distance of several centimeters and one-to-one wireless charging, strong demands for the U-IPT zone having long distance wireless charging with 3-D free-positioning...
Wide-range ubiquitous wireless power environment, called as ubiquitous Wi-power zone, where any electric devices can be charged by 3D-omnidirectional wireless charging, is newly proposed in this paper. By virtue of the proposed Direct-Quadrature (DQ) transmitting (Tx) coils with magnetic shielding, ubiquitous Wi-power zone having transmitting (Tx) coils can be provided over wide-range 3D spaces, which...
Inductive power transfer (IPT) converters are resonant converters that optimize energy efficiencies at some loads. To achieve maximum efficiency, it is common to cascade the IPT converter with front-side and load-side dc-dc converters. The two dc-dc converters are normally controlled cooperatively in order to meet the requirements of output regulation and maximum efficiency tracking using a control...
In this paper, an inductive power transfer (IPT) charger for electric vehicles (EVs) is proposed to improve the entire system efficiency and power density by eliminating the dc-dc converter in the secondary side. In the proposed IPT charger, the dc-link voltage is adjusted according to the coupling coefficient with the help of cascade buck-boost converter in the front-end side and the bridgeless rectifier...
The rotor position estimation and the speed control for drives of the ceiling fan motor (an outer-rotor permanent magnet synchronous motor) are studied in this paper. Then, the implementation of the aforementioned estimator and control algorithm using FPGA (Field Programmable Gate Array) is proposed. In the aspect of the rotor speed control, an I-ƒ start-up strategy is applied when the motor runs...
This paper discusses operating characteristics of a permanent magnet synchronous motor (PMSM) drive system based on direct torque control (DTC). In this system, the whole control system works in a rotating reference frame that is synchronized with the stator flux linkage vector (called M-T frame). The stator flux estimation is also based on a PMSM model in the M-T frame, and thus, this is expected...
This paper proposes a control method for torque response improvement in permanent magnet synchronous motors. In general, the torque response can be improved by using the inverter overmodulation range. However, in the overmodulation range, the performance of the auto current regulator (ACR) deteriorates significantly because disturbance components, which consist of low-order components, are fed back...
A pattern matching method for position sensorless control of IPMSMs having non-sinusoidal inductance spatial distribution in standstill and very low speed region has been proposed. In the proposed method, the rotor position is estimated by comparing the phase current derivatives measured in a real-time with those in advanced. The current derivatives are obtained by measuring the phase currents twice...
The controller design of servo drives for bandwidth improvement will presented in this paper. The delay issues caused by calculation, fdter and PWM generation, etc. are addressed. The controllers of current loop, speed loop and position loop are designed considering the delay and phase margin. Experimental results show the bandwidth for current, speed and position loops of servo drives are significantly...
This paper presents the suppression control of the source current harmonics of the bi-directional isolated AC/DC converter. The proposed circuit consists of three-phase AC to high-frequency single-phase AC matrix converter, high-frequency transformer, and single-phase AC to DC converter. The authors have achieved the soft-switching of all commutations of the both converters. The further downsizing...
In this paper, a novel valley-fill snubber circuit for a three-phase PWM inverter is proposed. One advantage of the valley-fill snubber is that surge voltage suppression is achieved without the power loss that happens in a conventional snubber resister. The second advantage is that ZVS/ZCS operation is realized without using additional active switches. Hence, the proposed snubber circuit is effective...
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