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In this paper, the effects of the stator design parameters on the torque and torque ripple of a Permanent Magnet Assisted Synchronous Reluctance Motor (PMaSynRM) is searched. As the rotor design parameters has very important role in the torque production dramatically, a fixed rotor structure is used as base design and kept constant throughout the paper to observe and compare the effects of stator...
This paper presents Finite Element Method calculation and measurement results of a permanent magnetic excited transverse flux machine designed as shoulder joint motor in an articulated six axis robot arm in service robotics. The transverse flux machine prototype with its claw pole stator and its external rotor with surface mounted permanent magnet, as well as the whole test bench setup is presented...
In this paper, a three phase delta connected self-excited induction generator (SEIG) excited by two capacitors and feeding a single phase load is investigated in both transient and steady state cases. Using symmetrical components analysis, two simple formulas are derived to calculate the required values of the two capacitors that result in balanced stator phase currents under rated conditions, which...
A novel pressure control system based on a centrifugal pump Simulink model is proposed aiming to reduce energy consumption during pump operation. The system developed provides the possibility of power reduction during pressure maintenance with the help of mixed pressure control strategy. To evaluate the system, a series of tests have been conducted that proved that the designed system is more beneficial...
In this paper, a model based fault detecting algorithm for detection of inter-turn short circuits in permanent magnet synchronous motors (PMSMs) is presented. Based on the PMSM model, the algorithm compares predicted values of the current space vector with the measurements to calculate an error vector, which will be used to detect the fault. A significant advantage of the developed algorithm is the...
This publication describes an novel fault tolerant converter for switch reluctance machines. It is proposed to take the advantages of multilevel output converter in the normal operation mode and exploit the switching states that are destructive for the conventional NPC topology and use them for fault tolerance. Moreover, simple and yet effective modulation technique has been found, modified and improved...
Efficiency is one of the most important characteristics of home appliances since there are tremendous amounts of units out in the market. Main factor effecting the efficiency of these home appliances is the efficiencies of the electrical motors used in them. A comparison is made for two particular motors used in washing machine; a Permanent Magnet Synchronous Motor and a Universal Motor. Comparison...
The paper presents a sensorless disturbance detection procedure that was done on a five phase induction motor with third harmonic injection. A test bench was developed where a three phase machine serves as disturbance generator of different frequencies. The control of the machines is based on multi scalar variables that ensures an independent control of the motor EMF and the rotor flux. For disturbance...
In this paper, a sensorless field oriented control system of five-phase induction machine with the 3rd harmonic rotor flux is presented. Two vector models, α1-β1 and α3-β3, were transformed into d1-q1, d3-q3 models oriented in rotating frames, which correspond to the 1st and 3rd harmonic plane respectively. The authors proposed the linearization of the model in d-q coordinate frames by introducing...
The recent activity of the authors, concerning different types of small PM machines, brought to the necessity to measure the respective cogging torques. Normally such a measure (including the hysteresis and bearing torque components), is realized with a prime motor to drag the machine under exam at very low speed and adopting a very good gearbox (classical method). During the activity a new method...
The aim of this work is to develop a robust model for short-term prediction of Photovoltaics (PV) generation. The model is structured with algorithms that belong to the technical field of computational intelligence. This approach provides the potential to form a forecasting system with high flexibility, efficiency and customization. The paper examines various combinations of inputs, in order to fully...
The quasi-Z-source inverter (qZSI) in a photovoltaic (PV) generation system (PGS) has been very popular among researchers due to its ability to boost the PV voltage with its single-stage topology. In comparison to the conventional two-stage inverter, the qZSI comes with lower cost and higher efficiency. So far, research was focused on different qZSI topologies and their control methods. Not much attention...
This paper presents a comparision between two controllers for Proton Exchange Membrane Fuel Cell PEMFC power system. The aim of this work is to keep the PEMFC working at its MPP by acting on the DC/DC converter, and ensure an adequate robustness against load and inputs variations. Conventional controller PI and backstepping technique are applied to the DC/DC boost converter. The stability of the backstepping...
Cascaded H-bridge multilevel converters are usually applied for high-power systems with independent dc sources. It can be used as PV inverter or to operate independent battery stacks. In these cases, as each dc source can be working at different operational points, conventional modulators lead to high distorted output waveforms degrading the converter performance. In this paper, a modulation method...
This paper presents an adaptive proportional resonant (PR) controller for single phase grid connected inverter that adapts its control parameters to grid impedance variations. Forth order band bass filter is designed and then integrated with the adaptive scheme for on-line detection of any variations in the resonance frequency. The estimated frequency is then processed by statistical signal processing...
Solar PV energy systems have become one of the most researched and developed renewable energy alternatives due to the long lifetime and reduced maintenance of its components. However, considering the low efficiency in the conversion from light to electrical energy, the optimization of the power electronics converters which deliver the energy from the panels to the electrical grid has fundamental importance...
The rapid development of rail transit brings a great increment of electricity, in order to reduce the energy consumption and the operating cost, energy storage technology has become a hot focus in the field of rail transit. In this paper, the power loss model of hybrid energy storage system (HESS) is established from the point of efficiency improving, which includes the loss of lithium-ion battery,...
this paper presents the comparative analysis of power converters topologies with impedance source. The analysis consist in the comparison between two power converter topologies: the first topology is a current source inverter (CSI) that incorporates SiC devices with Quasi-Z source impedance; the second topology is CSI power converter built using SiC devices that incorporates Trans-Z source impedance...
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