Analysis of split-phase electric machines with unequally-loaded stator windings and distorted phase currents

2010 ◽  
Author(s):  
A. Tessarolo
Keyword(s):  
Electric Machines ◽  
Stator Windings ◽  
Distorted Phase

scholarly journals Complex design of multi-machine electromechanical system of wind generators

2020 ◽  
pp. 66-71
Author(s):  
О. Popovych ◽  
L. Listovshchyk ◽  
А. Kribaa
Keyword(s):  
Output Power ◽  
Power Distribution ◽  
Resource Conservation ◽  
Electric Machines ◽  
Wind Power Plant ◽  
Mechanical Parameters ◽  
Stator Windings ◽  
Wind Generators ◽  
Energy Flows ◽  
Complex Design

The direction of modernization of the wind power plant is substantiated, which is aimed at a comprehensive increase in energy efficiency and resource conservation. Taking into account the reasons for the destruction of the teeth of the gear, a constructive scheme of a single-stage gearbox with several output shafts is proposed. This scheme allows you to distribute the output power to several electric machines, which, in turn, reduces the mechanical stress in the area of contact of the teeth of the gears and gears of the output shafts. Due to the division of the output power into several machines, the mass and dimensions of the gearbox are also reduced. The uniformity of power distribution on the shafts can be violated by the discrepancy between the parameters of gears, electromagnetic and mechanical parameters of electric machines. In the proposed design scheme, the uniformity of energy flows along the shafts is ensured by a sequential connection of the phases of the stator windings of electric generators.

scholarly journals THE METHOD OF CONTINUOUS AUTOMATED RESISTANCE CONTROL OF HIGH VOLTAGE MOTOR INSULATION

2020 ◽  
pp. 94-101
Author(s):  
Galina A. Kravchenko ◽  
Elvira L. Lvova ◽  
Alexey M. Makarov ◽  
Sergey V. Stolyarov
Keyword(s):  
High Voltage ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Electric Machines ◽  
Automated System ◽  
Software Modeling ◽  
Automated Control ◽  
Industrial Operation ◽  
Stator Windings ◽  
Diagnostic Complex

Electrical machines are widely used in various branches of the national economy. In particular, electric motors are one of the main elements in electrical power generation systems. The electric machines used at this ensure reliable operation of individual power units and the entire power supply system in general. The reliability of engines’ operation is largely determined by the quality of its insulation, that is why the improvement of methods for controlling the isolation of high voltage asynchronous motors is an actual task. The aim of the research is to develop a method of continuous automated control of electric insulation condition in stator windings of an asynchronous motor basing on the analysis of experimental and industrial operation data making it possible to estimate the dynamics of changes in the main insulation parameters. The main elements showing reliability of high-voltage electric machines, applied electro-insulation structures, methods for controlling insulation resistance in a high-voltage electric motor are considered in the article. The research performed was based on the results of the experimental and industrial operation of the automated system of insulation control under working voltage at the real facility carried out by the group of companies «Energopribor» of the town of Cheboksary. The analysis of existing methods for insulation control is given, the scheme of insulation control by superpositioning test current with the frequency which is different from industrial one. The authors propose the method to estimate the dynamics of resistance changes in insulation of stator windings of the asynchronous motor, to reveal its approximation to the maximum permissible state in the process of operation and in reserve shutdown. Software modeling was carried out, the results of which correspond to the data of experimental and industrial operation. The results obtained during the research allowed to systematize the obtained experimental data, to modernize the hardware part of the diagnostic complex DUKAT-SCAD, to outline the criteria area for its applicability.

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.

scholarly journals Slot Design Optimization for Copper Losses Reduction in Electric Machines for High Speed Applications

2020 ◽  
Vol 10 (21) ◽  
pp. 7425
Author(s):  
Claudio Bianchini ◽  
Mattia Vogni ◽  
Ambra Torreggiani ◽  
Stefano Nuzzo ◽  
Davide Barater ◽  
...  
Keyword(s):  
High Speed ◽  
Hybrid Electric Vehicles ◽  
Electric Machines ◽  
Proximity Effects ◽  
Stator Windings ◽  
Tooth Width ◽  
Slot Opening ◽  
Additional Losses ◽  
Copper Losses ◽  
Wide Operating

The need of a wide operating range and a high power density in electric machines for full- and hybrid electric vehicles in traction applications has led to an increase in the operating frequency of the machine. When the electric frequency increases, the additional losses in stator windings become an issue and they have to be taken into account in the design of the electric machine. This issue is more critical when hairpin windings are employed, due to the the skin and proximity effects which produce increased copper losses. In this paper, the relationships between different stator slot parameters (tooth width, slot opening, etc.) and stator winding copper losses have been analysed in order to identify an optimal design of a single stator slot.

scholarly journals Determination of Parameters of Asynchronous Electric Machines with Asymmetrical Windings of Electric Locomotives

2019 ◽  
Vol 21 (2) ◽  
pp. 24-31
Author(s):  
Sergey Goolak ◽  
Juraj Gerlici ◽  
Viktor Tkachenko ◽  
Svitlana Sapronova ◽  
Tomas Lack ◽  
...  
Keyword(s):  
Magnetic Energy ◽  
Asynchronous Motor ◽  
Electric Machines ◽  
Technical Solution ◽  
Electric Locomotive ◽  
Stator Windings ◽  
Motor Circuits ◽  
Determination Of Parameters ◽  
Geometrical Dimensions

This article is devoted to development of a method for calculating the parameters of an asynchronous motor of an electric locomotive with asymmetrical windings of stator and rotor. A method for determining self and mutual inductances of the stator and rotor phases of an asynchronous motor with asymmetric windings and their relations to mechanical variables is proposed. It is based on comparing two equations of stored magnetic energy, one equation calculated through induction, magnetic field strength and geometrical dimensions and another equation calculated through the parameters of the motor circuits. It is shown that the obtained solutions correspond to the previously existing methods, but they give the additional possibilities in mathematical modeling. The proposed technical solution allows higher accuracy developing of a mathematical model of a drive with an asynchronous motor having asymmetrical stator and rotor windings for studying dynamic processes during the operation of the specified drive, in particular, the drive of auxiliary machines for electric locomotive, where an asynchronous motor with asymmetrical stator windings is used as a phase release.

Preload dependent material properties of lamination stacks for electric machines

2019 ◽  
Vol 61 (12) ◽  
pp. 1192-1196
Author(s):  
Daniel Loos ◽  
Endre Barti ◽  
Rainer Wagener ◽  
Tobias Melz
Keyword(s):  
Material Properties ◽  
Electric Machines

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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