scholarly journals Modern Hybrid Excited Electric Machines

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5910
Author(s):  
Marcin Wardach ◽  
Ryszard Palka ◽  
Piotr Paplicki ◽  
Pawel Prajzendanc ◽  
Tomasz Zarebski
Keyword(s):  
Thermal Properties ◽  
Permanent Magnets ◽  
Scientific Research ◽  
Electric Machines ◽  
Electrical Machines ◽  
Mechanical And Thermal Properties ◽  
The Subject ◽  
Excitation Circuit

The paper deals with the overview of different designs of hybrid excited electrical machines, i.e., those with conventional permanent magnets excitation and additional DC-powered electromagnetic systems in the excitation circuit. The paper presents the most common topologies for this type of machines found in the literature—they were divided according to their electrical, mechanical and thermal properties. Against this background, the designs of hybrid excited machines that were the subject of scientific research of the authors are presented.

Joining of SiC Ceramic with Ternary Carbide Ti3SiC2

2005 ◽  
Vol 475-479 ◽  
pp. 1255-1258 ◽  
Author(s):  
Hongying Dong ◽  
Wen Bo Han ◽  
Shu Jie Li
Keyword(s):  
Thermal Properties ◽  
Base Material ◽  
External Pressure ◽  
Weld Strength ◽  
Mechanical And Thermal Properties ◽  
Technological Parameters ◽  
Orthogonal Experiments ◽  
Ternary Carbide ◽  
Sic Ceramic ◽  
The Subject

The investigation on joining of SiC to SiC has been conducted for some years. It is essential that the mechanical and thermal properties of the joints should meet the requirements of engineering. In view of the fact that the ternary carbide Ti3SiC2 has shown unique mechanical and thermal properties, it is promising to join SiC to SiC using ternary carbide Ti3SiC2 as filler (welding compound), and this is the subject to deal with in this paper. The joining of SiC to SiC has been successfully realized by hot pressing reaction joining process using Ti3SiC2 powder as filler. The optimized technological parameters have been obtained by orthogonal experiments, under which the achieved weld strength is higher than that of the welding base material SiC ceramic. Ti3SiC2 is stable up to 1200oC in Ar atmosphere with an external pressure. At the joining temperatures of 1300～ 1600oC the main phases of the interface are Ti3SiC2, TiC and TiSi2. The mechanism of bonding at the interface is interdiffusion and chemical reaction.

scholarly journals Method of Limiting Shaft Voltages in AC Electric Machines

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3326
Author(s):  
Sebastian Berhausen ◽  
Tomasz Jarek
Keyword(s):  
Laboratory Tests ◽  
Permanent Magnets ◽  
Load Condition ◽  
Synchronous Machine ◽  
Electric Machines ◽  
Electrical Machines ◽  
Voltage Measurement ◽  
Bearing Defects ◽  
Measurement Results ◽  
External Power

The article presents a new method of counteracting shaft voltages and currents in AC electrical machines. It is based on the use of an auxiliary winding located in the stator of the machine. The design of a test stand adapted to the measurement of shaft voltages of the machine, based on the prototype of a synchronous machine with permanent magnets, has been presented. The model was used to conduct a number of laboratory tests aimed at confirming the functionality of the auxiliary winding in various operating states of the machine (including no-load and load condition during generator operation). The article focuses on demonstrating the beneficial effect of the auxiliary winding on the level of induced shaft voltages in an electric machine. In order to confirm the close dependence of the circular flux in the stator yoke on the shaft voltage, shaft voltage measurement results for various cases of external power supply of auxiliary winding forcing a circular flux are presented. Regardless of the laboratory tests, a simulation model of a synchronous machine with permanent magnets, on which calculations were carried out to analyze the work of the auxiliary winding located in the stator yoke, was developed. The article is supplemented by a review of damage to electrical machines with a detailed description of bearing defects, as well as a brief de-scription of issues related to the mechanism of generating shaft voltages and currents in electrical machines and methods of counteracting them.

scholarly journals The method for calculation and optimization of parameters of synchronous electric machines with permanent magnets as part of the generating and driving complexes

2019 ◽  
Vol 124 ◽  
pp. 05004
Author(s):  
A.R. Safin ◽  
I.V. Ivshin ◽  
T.I. Petrov
Keyword(s):  
Energy Efficient ◽  
Power Plants ◽  
Permanent Magnets ◽  
Electrical Energy ◽  
Electric Machines ◽  
Electrical Machines ◽  
Optimization Of Parameters

New methodical solutions have been developed in the field of creating energy-efficient synchronous electrical machines with permanent magnets, designed to generate electrical energy as part of autonomous power plants and to drive various mechanisms.

Numerical Modeling of Dynamic Processes of the Reciprocating Reversible Electrical Machine

2015 ◽  
Vol 792 ◽  
pp. 134-142
Author(s):  
Igor Vladimirovich Ivshin ◽  
Andrey Michailovich Kopylov ◽  
Alfred Robertovich Safin
Keyword(s):  
Numerical Modeling ◽  
Internal Combustion Engines ◽  
Permanent Magnets ◽  
Electric Machines ◽  
Electrical Machines ◽  
Design Parameters ◽  
Electrical Machine ◽  
Operating Cycle ◽  
Stator Windings ◽  
Linear Electric Machine

Now rotational electrical machines are used mainly for the implementation a reciprocating motion of working mechanisms and also as the electric generators powered by internal combustion engines. It is achieved by means of the kinematic transfers complicating a design and reducing the drive efficiency. The use of linear reciprocating electric machines allows to eliminate these defects. It should be noted that the most effective ones are the cylindrical designs of reciprocating electric machines with permanent magnets, whose efficiency reaches 93 – 95%. However, the rarity and lack of a mass production of this machine type and special recommendations for their design causes the need of research, directed on search of optimum constructive decisions. The article describes the types of linear electrical machines and summarizes the results of numerical modeling of dynamic characteristics for the three versions of the reciprocating cylindrical machine with permanent magnets of 10 kW with the oscillation frequency of the translator 20 Hz and the length of operating cycle of 120 mm. The most effective design parameters of linear electric machine were determined on the basis of its specific characteristics and analysis of the EMF graphics shape, appearing on the stator windings in the generator mode.

Genetic algorithm application for optimization of geometry of synchronous electric motor with permanent magnets by criterion of electromagnetic torque

2019 ◽  
pp. 56-62
Author(s):  
I. N. Belezyakov ◽  
K. G. Arakancev
Keyword(s):  
Genetic Algorithm ◽  
Electric Motor ◽  
Permanent Magnets ◽  
Evolutionary Optimization ◽  
Electric Machines ◽  
Geometric Parameters ◽  
Geometrical Parameters ◽  
Electromagnetic Torque ◽  
Automatic Control Systems ◽  
Optimization Of Geometry

At present time there is a need to develop a methodology for electric motors design which will ensure the optimality of their geometrical parameters according to one or a set of criterias. With the growth of computer calculating power it becomes possible to develop methods based on numerical methods for electric machines computing. The article describes method of a singlecriterion evolutionary optimization of synchronous electric machines with permanent magnets taking into account the given restrictions on the overall dimensions and characteristics of structural materials. The described approach is based on applying of a genetic algorithm for carrying out evolutionary optimization of geometric parameters of a given configuration of electric motor. Optimization criteria may be different, but in automatic control systems high requirements are imposed to electromagnetic torque electric machine produces. During genetic algorithm work it optimizes given geometric parameters of the electric motor according to the criterion of its torque value, which is being calculated using finite element method.

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