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Sensorless position estimation based on signal-injection methods always requires a resistance- or inductance-based anisotropy. Therefore, a short-circuited electrical winding can be attached on the rotor. As will be derived in this paper, this method leads to both a resistance- and inductance-based saliency. By an experimental test setup, both saliencies are analyzed and compared towards their accuracy...
Interior permanent magnet synchronous motors (IPMSMs) that employ rare-earth magnets are high-performance motors and are used in many applications. However, it is desirable to reduce the number of rare-earth magnets used in IPMSMs because of the high cost. If a non-rare earth magnet is used in IPMSMs with concentrated windings, the motor generates reluctance torque principally; however, this reluctance...
SRMs, switched reluctance motors, are being expected as an excellent candidate for power sources in harsh environments due to the simple structure. In spite of many methods proposed to eliminate the rotor position sensor, which is needed to commutate the current correctly but not compatible with harsh environments, no successful sensor-less method has been seen so far. The method proposed in this...
Calculating leakage reactance of transformers is a very important factor in designing transformers. In the traditional two-winding transformer, the calculation methods of leakage reactance have been presented using the inductance deduced by the geometry mean length between two windings. However, it is difficult to calculate the leakage reactance in multi-winding transformers, because its structure...
This paper discusses about a multi-port solid state transformer (SST) which can be used as an inter-grid power flow controller. The objective of the converter is to integrate renewable energy sources with the existing grid along with controlled power flow between the grids. As an example, this paper describes a three terminal isolated SST with an integrated battery bank connected to it. The energy...
Winding layouts for the bearingless ac homopolar and consequent pole motors that allow the same coils to be used for both radial force and torque production are investigated. This concept enables a “pure” bearingless motor where the same iron and copper are used for both magnetic bearing operation and torque production. For three phase windings, it is shown that these schemes limit 6-pole machines...
The contactless power transformer systems (CPTs) have recently attracted much attention as it is possible to supply electrical energy to mobile vehicles without cables. 300kW class CPT systems are required for railway vehicles power feeding applications. In this power range, there are some technical problems such as higher reactive power due to longer gap and power control at the misalignment of ground...
This paper describes mathematical modeling of a novel wound-field synchronous motor self-excited by space harmonics. The torque equation on the dq-reference frame is investigated to clarify the self-excitation mechanism of the proposed motor. It has been analytically explicated how the motor parameters give influences on the self-excited electromagnet torque. Furthermore, the current phase vs. torque...
Electrical drives with open-end winding configurations offer certain advantages over drives with star-connected windings such as higher dc-link voltage utilization and lower inverter losses. However, there are a couple of drawbacks like circulating currents, diminishing the performance of the drive. This paper compares the performance of inverter and drive configurations with star-connected windings...
Cooperative Study Group on Standard Model Development for Power Electronics Simulations, created under the Industry Applications Society of the IEEJ (Institute of Electrical Engineers of Japan), is active to develop standard models for simulations related to power electronics. Under the study group, four working groups (WGs) have been created for different fields of simulation. Among them, Smart Grid...
A dc-dc converter with very high voltage gain is proposed in this paper for any medium-power application requiring a high voltage boost with galvanic isolation. The proposed converter topology can be realized using only two switches. With this topology a very high voltage boost can be achieved even with a relatively low duty cycle of the switches, and the gain obtainable is presently not matched by...
DC-DC converters of hybrid vehicles and electric vehicles are required to become smaller and lighter for building roomy and light weight EV. High-frequency switching can be used to miniaturize DC-DC converter. However, the influence of the skin effect and the eddy current become large. Parallel operation of converter is often for current applications using multiple winding transformers in order to...
Reaction wheels (RWs) for small satellites with active magnetic bearings allowing for ultra-high-speed operation show advantages in angular momentum density over ball bearing RWs with limited speed according to scaling laws developed in this paper. A reaction wheel demonstrator design based on a novel dual hetero/homoploar, slotless, self-bearing, permanent-magnet synchronous motor concept with a...
For high speed bearingless disk drives, certain topologies are advantageous. The authors have published works on a bearingless disk drive for high speeds which is characterized by a slotless stator and a toroid winding set. Several different variations of this setup are imaginable. The ones which this work focuses on are the variation of the number of phases, of the number of coils, and of the applied...
This work introduces a novel bearingless slice motor design, the bearingless flux-switching slice motor. In contrast to state-of-the-art bearingless slice motors the rotor in this new design does not possess any permanent magnets. This offers advantages for disposable rotor devices for instance in the medical industry and extends the range of bearingless slice motors towards high temperature applications...
Solid-State Transformers (SSTs) are considered important building blocks of a future Smart Grid, where they will replace conventional transformers and provide enhanced functionality and controllability. To deal with the medium-voltage levels at the input of an SST for distribution applications, commonly cascaded cells converter topologies are proposed. This paper presents a detailed analysis of the...
In this paper, two novel bearingless switched reluctance motors (BLSRMs), 8/10 hybrid type and 12/14 hybrid type, are presented. The two BLSRMs have separate torque and suspending force poles. Due to the independent characteristics between the torque and suspending force, the torque control can be decoupled from the suspending force control. In this paper, suspending force control characteristics...
Electric vehicles (EV) offer promise as an effective solution to environmental problems. One of the keys to their successful diffusion is the provision of adequate battery charging infrastructure. In order to create a charging infrastructure by installing equipment in such as locations as carports in private homes, the wireless battery charging system is very suitable. EVs can be used in smart house...
A new two-phase mathematical model of Linear Induction Motor (LIM) is discussed. This model is simpler than conventional model, but can correctly calculate both asymmetric primary current and thrust ripple performances. In addition, an improved DC testing method is proposed to determine all circuit parameters in the model. This test is completed by only one simple standstill test. Hence, both no-load...
High frequency transformers are widely used in Switched-mode power supplies and now are being proposed to be used with power electronic converters to replace line-frequency transformers. This paper presents a winding design procedure for minimizing the power losses using foils and solid round wires under sinusoidal excitation to limit the temperature rise. This paper derives the range from which the...
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