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We designed and built a trial small size and ultra-high speed motor of 2 poles, 5kW and 240,000rpm as the target. And we had described our prototype ultra-high speed drive system and some experimental results in previous papers. But the evaluation of this kind of motor drive system is difficult only by the experiments. Then we also had described the electric and magnetic coupled analysis which was...
Highly compact magnetically levitated pump systems are of growing interest in semiconductor processing applications due to the increasing costs of clean room space. The need of a higher hydraulic pressure in a smaller mounting volume raises the necessity of a complete integration of the power and signal electronics together with the motor and the pump into one compact system. Thereby, the system complexity...
For low speed applications, such as rotating and swing stages, a multi-consequent-pole bearingless motor is proposed. This paper describes basic characteristics of a multi-consequent-pole bearingless motor. Unlike conventional bearingless motors, suspension force generating on consequent-pole type is independent of rotor rotational position. Thus, multi-pole rotors such as 40, 44, and 46 poles are...
It is a little difficult to obtain the lower DC voltage below the one obtained from input AC supply voltage without transformer or switching operations. Those operations can be implemented by passive devices due to fabrication of electrolytic capacitors. The results are confirmed by the theoretical and experimental implementations.
The buck-boost power factor corrected (PFC) converter has wide range of the DC output voltage. In this paper, the application for the V-connected inverter to reduce the cost of the inverter is proposed. First the balance of series connected smoothing capacitor voltage is discussed. Next, double converter configuration to reduce the input current ripple is discussed. Finally, a soft-switching method...
A multi-phase dc-to-dc converter controlled by hysteretic PWM method is presented in this paper. An and-gated logic circuit is employed for the synchronization and its operating principle is described. A 5 V to 1.5 V prototype buck converter of two-phase is implemented for a POL power supply. From the experiments, it is confirmed that the proposed method can be well synchronized, and an excellent...
This paper deals with some technological evaluations based on key designs of application specific power semiconductor switching devices in developing generation stages for consumer power electronic cooking equipments. In addition to these, the historical review of soft-switching inverter circuits and systems using high frequency IGBTs are also summarized and described for IH cooking appliances. In...
In order to maximize the power density of a converter, a systematic procedure for optimizing the cooling system is necessary. Solving the equations of the optimization procedure described in this paper can be performed numerically without much effort, but manufacturing the resulting optimum heat sink is often extremely difficult and expensive, and therefore impractical. Based on the optimization theory,...
In this paper, we have shown the concepts behind designing an inverter power unit for train applications. We have also discussed about low-loss power units by using trench structure low-loss IGBT and compared it with planar structure IGBT. Also by using power unit with low-loss IGBT and performing temperature simulation and data measured from test runs, we were able to confirm on the effect of low-loss...
The accelerator magnet power supply is an important and unique field for the power electronic devices, such as thyristor, GTO, IGBT, IEGT so on. In this report, authors will introduce the power supply system for the synchrotron accelerator magnet, for example, KEK 12 GeV-PS, J-PARC and then pulsed magnet power supply.
It is well known that the frame vibration of the PMSM occurs. The authors have suggested a suppression frame vibration method using Fourier transform and repetitive control. The method requires an acceleration sensor and a position sensor. However, the use of such a sensor is not desired from a cost point of view. Therefore, in this paper, we propose a frame vibration suppression method with no sensor...
This paper discusses applications of a magnetic energy recovery switch (MERS) to induction motor drive. The MERS is a series compensation device, which can control voltage and input power factor. Characteristics and operation principles of voltage control and power factor correction by MERS are described. Some applications of the MERS to induction motor drive are investigated. Series capacitor compensation...
In this paper we present a new approach to computer-aided analysis and design of power electronic systems, which we call simulator based approach. Most common computer aided approach is to utilize a transient simulator which is developed for power electronic systems. We give more advanced role to transient simulators. We discuss a method to develop simulator based analysis and design tools of power...
This paper describes a position sensorless control for switched reluctance motors (SRMs). The SRM is controlled using the de-fluxing period and the difference between the active phase inductance and the phase inductance at the aligned position. The commutation is carried out so that the phase current becomes zero at the aligned position and the negative torque is not produced. During the regenerative...
In the field of a hot strip mill facility of steel industry, there are needs of large power induction-heating equipment for energy saving and improvement of a product quality. We have delivered the 9,000 kW-1,500 Hz frequency converters for induction-heater, the largest in the world. We applied the series connection technology and the parallel connection technology of the thyristor to realize a high-power...
This paper presents a novel phase shifted ZVS-PWM high frequency load resonant inverter for electromagnetic induction fluid heating (IH) appliances. The proposed high frequency inverter can be achieved stable and efficient zero voltage soft commutation over a widely specified power regulation range from full power to low power by using an active auxiliary quasi resonant snubber. The steady state operating...
A comparison between trench IGBT, trench MOSFET and superjunction MOSFET is provided in the context of an automotive full bridge DC to DC converter. The converter is analyzed in both hard switching and phase shifted ZVS operation in 3 different voltage ranges (medium, high and extended ranges). After calculating the device loss models, the results are provided as trade-off curves function of normalized...
The development of single-phase power factor correction (PFC) technologies was traditionally driven by the need for computers, telecommunication, lighting, and other electronic devices and systems to meet harmonic current limits defined by IEC 61000-3-2 and other regulatory standards. Recently, several new applications have emerged as additional drivers for the development of the technologies. One...
In this paper, single-phase shunt active power filter (APF) controlled through hysteresis-current control is studied. A proposition is made to use the limitation on the maximum switching frequency of the power devices. This limitation increases stability to electromagnetic influences and facilitates filtering of the radio interference to the source network. In the paper, there are attached computer...
This paper proposes a new current balancer for single-phase three-wire distribution feeders using a three-leg voltage-source PWM inverter, which is equivalent to a three-phase voltage source inverter. Intelligent power modules (IPMs) can be used for the proposed current balancer. Thus we can provide a cost-effective and small-volume current balancer. A new control method for the proposed current balancer...
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