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We analyzed the local behaviors of both time and space harmonic magnetic fluxes in this research to improve the efficiency of inverter feeding induction motors. As a result, we clarified that: (1) the magnetic flux of time harmonics passes in parallel through rotor bars, and (2) the magnetic flux of space harmonics passes radially through the rotor bars from the delay side in the direction of rotation...
This paper presents an experimental efficiency comparison study between two different AC-AC converter prototypes: the direct matrix converter (DMC) and indirect matrix converter (IMC). The evaluation is performed under different load conditions and using discrete IGBTs at a power level up to 9k[W]. The losses measurement is carried out by means of two power analyzers: one placed at the input and one...
Usually, the insertion loss (IL) of the EMI filter is characterized under 50Q/50Q input and output impedances even if these impedances are different in the real application. In this paper, two approaches are presented to calculate the insertion loss of the filter taking into account the arbitrary input and output impedances. First, a black-box 50Q/50Q model is obtained from S-parameters and then extended...
While high frequency switching of power converters can enable inductor volume reductions, large temperature increases occur in such inductors as their thermal resistance increases. Therefore, the ability to accurately calculate inductor iron losses is necessary when designing high-power-density converters. In the present paper, the authors propose an accurate iron loss calculation method for inductors...
Two methods are proposed for evaluating the iron loss of an AC filter inductor used in a pulse-width modulation (PWM) inverter. The first method uses a loss map and calculates the iron loss without using a real PWM inverter, and the second method uses an iron loss analyzer (ILA), which can measure the iron loss during each switching period of a real PWM inverter. The authors compared the results of...
Transmitting and receiving resonators for 7 kW-class wireless power transfer/transmission (WPT) systems operating at 85 kHz have been developed for contactless Electric Vehicle (EV) / Plugin Hybrid EV (PHEV) charging. The light weight and small volume of the on-board receiving resonator to be mounted on the vehicle are required attributes. A thickness and a shape of the core in the resonance coil...
This paper presents a high-speed 3 kW 80 krpm surface-mounted permanent magnet (SMPM) motor for compressor applications. The design procedure using finite element analysis (FEA) is presented with a particular focus on the efficiency calculation. The paper also aims to give general indications to provide a cost-efficient solution. A prototype is built and experimental results are given and compared...
This paper studies experimentally the benefits of silicon carbide based power semiconductor technology in a low-voltage grid connected three-phase three-wire pulse width modulated rectifier. The power semiconductor module used in the study is a custom-made 1.2-kV 100-A fully silicon carbide based half-bridge type module designed for fast switching speeds and high temperature operation. The experimental...
In this paper, we investigate the impact of mechanical stress on characteristics of interior permanent magnet synchronous motors from both results of measurement and calculation. First, the basic experiments by using stator cores with/without shrink fitting of housing are carried out. The measured iron loss is compared with the calculated results obtained by combined stress and electromagnetic field...
This paper presents an accurate and fast iron loss calculation method with Finite Element Analysis (FEA) for Switched Reluctance (SR) motors. The losses of the SR motors mainly come from the hysteresis loss due to draw the minor hysteresis loops in B-H curve and high frequency eddy current loss. However these losses are difficult to estimate by using the conventional Steinmetz based calculation methods...
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...
This paper presents a practical investigation of the eddy current losses caused by 3D effects in a Motor Integrated Permanent Magnet Gear (MIPMG). Two prototypes of a MIPMG have been designed and build to be used as traction units for an electric vehicle. The measured efficiency of the prototype MIPMGs is superior in urban traffic when compared to state of the art direct drives, even though the measured...
The rapid development of power devices in recent years has led to a proposal of high-power isolated DC-DC converters using medium-frequency (MF) transformers. To realize such converters, it is important to miniaturize magnetic devices such as the transformer and inductor, because the volume of the magnetic devices is larger than that of other components. This paper proposes a procedure for reducing...
The authors have previously reported that the iron loss of an inductor varies according to its premagnetization, and this depends heavily on the core material. In the present paper, the iron loss characteristics for the premagnetization of typical magnetic materials, such as a ferrite core, an iron powder core, and a sendust core are shown. Based on the loss characteristics, the loss calculation of...
The improved 2-D equivalent analytical calculation method to estimate conductive losses in gapped magnetic components in a wide range of frequencies is extended to the calculations of conduction losses in flyback transformers. The i2D method, that is applicable to power inductor, is extended is extended to the winding loss calculation in gapped transformers, such as flyback transformers, by means...
The degrading effect of laser cutting on steel sheet material, and thus on the material's magnetic characteristics, is much less understood than that of mechanical cutting. Furthermore, the estimated degrading influence on magnetic properties is still difficult to determine and not sufficiently known. In this paper, the magnetic characteristics of the degraded and non-degraded zones are computed from...
Detection of lamination faults is key in the prevention of more serious generator core damage. Localized stator core faults occur frequently in rotational flux zones. Therefore, this paper studies the behavior of rotational flux in the presence of shorted laminations. Faults result in a redistribution of the magnetic field across the sample and hence the flux density distribution. Different sizes...
A simple technique to measure the switching and conduction losses in modern semiconductor switching devices of inverters at specified chip temperatures has been developed. The proposed method achieves accurate results even with low-cost measurement equipment and does not require the modification of the inverter circuit by implementation of current and voltage sensing devices or heat flux sensors....
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