JSC NIPTIEM

Vladimir, Russia

JSC NIPTIEM

Vladimir, Russia
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This article focuses on the use of speed characteristics in issues of the development of variable-speed induction motors. An algorithm for constructing a test electromagnetic calculation, which takes into account the influence of the main regulators of the control system and uses the basic design formulas and procedures of the known methods, is proposed. The algorithm solves the inverse problem concerning test electromagnetic calculation. Ways of using the proposed technique for the solution of practical tasks, which include the creation of speed characteristics, as well as finding the optimum power supply regime, are shown. Results of comparison of the design and experimental data are given. © 2015, Allerton Press, Inc.


Kruglikov O.V.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

The main results of development of directly driven elevator machines carried out in 2008–2014 at JSC NIPTIEM are reported. Reasons are given for preferring to use a squirrel-cage induction motor in the low-speed variable-frequency drive of a gearless elevator machine. Algorithms for designing the active part of the motor and the elevator machine are presented. The importance of using experimental data to improve the calculation techniques and the parameters of the motors, as well as the necessity of mathematical simulation for designing variable-frequency motors, is shown. The basic technical and economic characteristics and the product range of directly driven elevator machines made by the Karacharovskii Mechanical Plant are reported. © 2015, Allerton Press, Inc.


Vinogradov A.B.,JSC NIPTIEM | Gnezdov N.E.,JSC NIPTIEM | Zhuravlev S.V.,JSC NIPTIEM | Sibirtsev A.N.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

Basic results of development of an ac electromechanical transmission for the BelAZ mining dump truck with a load capacity of 240 t carried out at Ruselprom have been considered. The requirements and features have been studied of traction electrical equipment that complicate the solved task, in particular the limited response speed of voltage control channel in a dc link, low capacity of the link, the range of control of variables with a field reduction of more than 15: 1, and required braking regime power twice exceeding the traction regime power. A functional diagram of traction electrical equipment is shown, and the frequency-dependent temperature derating of the extreme output current of the inverter to improve the reliability and maximum use of power keys is considered. The structures of control systems that work via excitation of a synchronous traction generator and by the left and right wheel drives and model of the dump truck have been described. As a result of modeling the dynamic characteristics and operating regimes of an internal combustion engine, generator and traction motors have been brought into coincidence, the most effective version of control algorithms in a slipping of the driving wheels has been selected, and the low sensitivity of electrical drives to the change of parameters of the power channel has been found. The program, the technique, and the results of tests of traction electrical equipment on a full-scale test bench have been presented. The required static indicators have been achieved, as well as the time of processing of the step rise of generator nominal load equal to 0.2 s with a voltage depression of 5% and a transition from the extreme traction torque to 90% of the brake torque of less than 2 s in any working speed. Ground tests of a dump truck with the designed set of equipment are planned for the first half of 2015. © 2015, Allerton Press, Inc.


Kobelev A.S.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

To speed up the process of designing active parts of induction motors, it is proposed to classify the set of basic applications into three basic groups: harmonious, torque, and torque with limited starting current. The significance of particular optimization criteria is determined for each cluster. The universal set of solutions for the subclass of IM are located inside a region delimited by solutions with the greatest significance of basic particular criteria of each of the three groups of applications. Electromagnetic and technological metrics for low-, medium-, and high-capacity induction motors and the most efficient topologies of rotor and stator slots for each of the clusters are proposed. The applicability of copper or iron machines in different areas is discussed. Cluster analysis is noted to be the next step in the transition from automated to almost automatic design of active parts of electric machines. © 2015, Allerton Press, Inc.


Shabaev V.A.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

Features of control by electromechanical energy transformers with “hard” and “hauling” mechanical characteristics are considered. It is shown that the mechanical characteristics of direct-current motors with permanent magnets are “hard” and the speed is determined by not only the input voltage, but also the load moment. The mechanical characteristics of a direct-current commutator motor with series excitation are hauling in nature, and the moment is proportional to the square of current. Noncontact electromechanical energy transformers can have both hard and hauling mechanical characteristics, depending on the control methods. Electromechanical energy transformers in which there are no permanent magnets or exciting windings can operate with a constant flux of excitation with a hard mechanical characteristic or with a hauling mechanical characteristic under a change in excitation flux. In the last case, an energy-saving regime is implemented in the electromechanical energy transformers. It is shown that, to increase the accuracy of control systems with different electromechanical energy transformers, certain methods and control units need to be used. A functional diagram of control by electromechanical energy transformers with hauling electromechanical characteristics and compensation of load moment at a constant equivalent inertia moment is given. © 2015, Allerton Press, Inc.


Dragomirov M.S.,JSC NIPTIEM | Zhuravlev S.A.,JSC NIPTIEM | Zaitsev A.M.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

In this article, a procedure for numerical simulation of the temperature of electrical machine components with a combined cooling system is considered: by means of flowing cooling, part of the external surface of a motor housing is cooled with water and the internal area of the electrical machine is cooled with air. A comparison of results of simulation by the provided calculation procedure with the experimental data is given. © 2015, Allerton Press, Inc.


Afonin V.I.,JSC NIPTIEM | Kruglikov O.V.,JSC NIPTIEM | Rodionov R.V.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

Provision of reliability to coils of electric motors for gearless elevator drives is considered. The results of studying wave processes in electric motors for gearless elevator drives are presented. One of the basic components of electromechanical elevator drives is an electric motor with adjustable frequency of rotation and an automatic speed control unit (frequency converter) of corresponding power. In the last quarter of the 20th century, these drives replaced traditional drive units with a two-speed induction motor (AC2), which was prompted by the wide use of microelectronic innovations. As indicated by the best operating practices and Russian and foreign research literature, the most promising units for use as electromechanical energy converters in elevator electric drives are high-torque induction motors with a square-cage rotor and synchronous motors with permanent magnets (VVVF). A persistent opinion has taken root that using these systems of elevator control will make it possible to save twice as much energy in comparison with traditional drives with a gear unit and a traction sheave. © 2015, Allerton Press, Inc.


Rodionov R.V.,JSC NIPTIEM
Russian Electrical Engineering | Year: 2015

A new edition of IEC 34-2 part 1 laying out methods for determination of losses and electric engine efficiency, as well as demands placed on gauges, was introduced in September 2007. The method for determination of additional losses was published in the last edition of IEC, but missing in GOST (State Standard) 7217. The method is for carrying out tests for asymmetric power supply of asynchronous motors. The essence of the method lies in producing a reversely rotating field, which allows one to avoid experiments with reverse rotation. Supply voltage asymmetry is produced using an additional resistor connected with one of the phase. It is recommended to carry out the experiments with a cold engine to avoid overheating the winding due to asymmetry of phase currents. Linear voltages and currents, as well as power and skidding, are measured during the experiments. Data processing is reduced to determination of current and voltages of the direct and reverse sequence. A functional dependence of additional losses on the reverse sequence current is obtained, and the additional losses under the nominal regime are determined. Application of new test methods and determination of power efficiency will allow one to create prerequisites for increasing the technological level of modern low-voltage asynchronous motors. © 2015, Allerton Press, Inc.


Some properties of fractional single-toothed concentrated windings that contribute to their effective application in electrical machines have been considered. Small end windings allow making an electrical machine more compact in the axial direction, which makes it possible to use it in several applications: in motor-wheel drives, in a wind wheel power generator, in an elevator drive without room for a machine, etc. Fractional windings can significantly reduce the cogging torque of an electrical machine. This reduces the cogging torque, which is very important in wind energy, but at the same time it increases the smoothness and accuracy of positioning, which allows it to be used in special electrical machines. One of the drawbacks of the fractional single-toothed concentrated windings is a worse MMF harmonic content. With this in mind, application of a two-layer winding is to be preferred to that of a single-layer one. An example shows application of a fractional tooth concentrated winding in a synchronous engine with permanent magnets to drive the plunger pump used for oil production. The use of a two-layer winding instead of a single-layer one allowed reducing the eddy-current losses in the rotor by 3.7 times and avoiding unacceptable overheating of magnets. © 2015, Allerton Press, Inc.

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