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In Adjustable Speed Drives (ASD), high frequency parasitic currents cause several unexpected problems, such as premature deterioration of motor winding insulation and ball bearings. In order to understand and to mitigate electromagnetic disturbance it is necessary to use a precise model of the PWM inverter, the energy cable and the AC motor. In this paper, an equivalent circuit of the three phase...
This paper proposes a method that extracts the phase-to-phase coupling of the three-phase stator winding of an ac motor for high-frequency characterization. Under the assumption of a symmetric structure, the multiport network parameters are obtained by the conversion of two-port mixed-mode network parameters. The proposed method simplifies the calculation to extract the impedance parameters of the...
Conducted emission tests are always performed by the use of LISNs in laboratories in accordance with CISPR22, CISPR11 and other similar standards. However, it is not always possible to use LISNs because of some limitations. If the Equipment Under Test (EUT) has large dimensions or high currents, it is not, for most of the time, possible to send it to an EMC laboratory or to use LISNs during the test...
One of the main challenges in the development of electric car propulsion systems is to ensure their functional stability regarding system control and EMC. Especially since all components are developed independently by several suppliers with minor knowledge about the overall system the component is included later on. Up to now the first system compatibility is not performed before all components are...
Conducted emission tests are always performed by the use of LISNs in laboratories in accordance with CISPR22, CISPR11 and other similar standards. However, it is not always possible to use LISNs because of some limitations. If the EUT (Equipment Under Test) has large dimensions or high currents, it is not, most of the time, possible to send it to an EMC laboratory or to use LISNs during the test....
At present, electric traction systems are introduced into automotive applications. The driving power is transmitted via cables, which are routed close to various communication, sensor or control units. Ensuring the electromagnetic compatibility (EMC) of these miscellaneous systems within the electric vehicle is a new challenge for the developing engineers. Line filters are a very effective EMC measure,...
High frequency (HF) models of electrical motors and converters are of basic importance for Electro Magnetic Compatibility (EMC) characterization of electrical drives and for EMI filters design. In this paper a method for characterizing and tuning HF models (150kHz - 30MHz) for induction motors has been proposed based on experimental measurements of the motor impedance. Impedance measurements have...
The influence that small variations of the network impedance may have on the non-sinusoidal (harmonic) network current at the point of connection of a harmonic distortion measurement system, as well as on flicker measurements has been studied. In this respect, several equivalent circuits were devised and analysed as possible models for the study of the network impedance, trying all the time to provide...
This paper proposes a black box approach which synthesizes lumped circuit model of the Foster type for a frequency-dependent characteristic element by the least squares method systematically. However there are two numerical difficulties to model them. One is the numerical stability problem which comes from limitation of effective numerical digits of data especially for wide frequency band ranges....
Lighting systems are omnipresent and their electrical and electronic components become increasingly complex - thus their interference potential also increases and needs to be carefully assessed. This paper looks at a luminaire from a network point of view, describing the wiring and geometry of the gear tray as an N-port network, and critical components as excitation and load for that network. The...
Models of integrated circuits (ICs) allow printed circuit board (PCB) developers to predict radiated and conducted emissions early in board development and allow IC manufactures insight into how to build their ICs better for electromagnetic compatibility (EMC). A model of the power delivery network, similar to the ICEM or LECCS model, was developed for a microcontroller running a typical program and...
This paper deals with the modelling of the susceptibility to RF aggression of several input buffers structures implemented in a 90 nm test-chip. Measurement results, model construction and simulation flow are detailed.
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