Electromechanical Transmission Research Articles

Оценка эффективности гидромеханической и электромеханической трансмиссии двухосных карьерных самосвалов по величине КПД

Оценка эффективности гидромеханической и электромеханической трансмиссии двухосных карьерных самосвалов по величине КПД

Mathematical Modeling of Weak and Strong Piezoelectric Interfaces

We study the electromechanical behavior of a thin interphase, constituted by a piezoelectric anisotropic thin layer, embedded between two generic three-dimensional piezoelectric bodies by means of the asymptotic analysis. After defining a small real dimensionless parameter e, which will tend to zero, we characterize two different limit models and their associated limit problems, the so-called weak and strong interface models, respectively. Moreover, we identify the non classical electromechanical transmission conditions at the interface between the two three-dimensional bodies.

Топливная экономичность силовой установки автомобиля с электромеханической трансмиссией

Топливная экономичность силовой установки автомобиля с электромеханической трансмиссией

Results of the development and testing of traction electrical equipment of mining dump truck with load capacity of 240 tons

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.

Hysteresis-free high-temperature precise bimorph actuators produced by direct bonding of lithium niobate wafers

The current paper presents a piezoelectric bimorph actuator produced by direct bonding of lithium niobate wafers with the mirrored Y and Z axes. Direct bonding technology allowed to fabricate bidomain plate with precise positioning of ideally flat domain boundary. By optimizing the cutting angle (128° Y-cut), the piezoelectric constant became as large as 27.3 pC/N. Investigation of voltage dependence of bending displacement confirmed that bimorph actuator has excellent linearity and hysteresis-free. Decrease of the applied voltage down to mV range showed the perfect linearity up to the sub-nm deflection amplitude. The frequency and temperature dependences of electromechanical transmission coefficient in wide temperature range (from 300 to 900 K) were investigated.

A Novel Nonlinear Optimal Control Approach for the Dynamic Process of a Hybrid Electric Vehicle Equipped with Electromechanical Transmission

Coordinatively controlling the engine and several motor/generators (MGs) during a dynamic process is a challenging problem because they are coupled together by the electromechanical transmission (EMT) system and all of them have strong nonlinear characteristics. We develop a novel nonlinear optimal control approach based on the multiobjective dynamic optimization model of the hybrid electric vehicle (HEV), which is equipped with an EMT system. In this approach, the current states of the components are obtained by using the state observation algorithm based on Kalman filtering; the future states of the components and the feasible region of the control variables are estimated by using the dynamic prediction algorithm based on the nonlinear model of the EMT system. Then, the control variables are achieved by using the optimal decision algorithm based on the hierarchical optimization and nonlinear programming, and the influence of the model error and the external disturbance are modified by using the feedback compensation algorithm. The simulation results illustrate the efficiency of the proposed control approach, and the test results verify its real-time performance.

Research on the Dynamic Power Control Strategy of the Two-mode Electro-mechanical Variable Transmission

Research on the Dynamic Power Control Strategy of the Two-mode Electro-mechanical Variable Transmission

Вентильно-индукторный реактивный электропривод средней и большой мощности: зарубежный и отечественный опыт

The information on the introduction of switched reluctance drives (SRD) medium and high power abroad and in Russia in various areas: water and land transportation, mining machinery, pumps and compressors, and others. The world leader in the development and delivery SRD is a Japanese company Nidec Motor Corporation (NMC), which is commercially available under the brand name US Motors line of industrial SRD small and medium power. Mass production SRD average power for electromechanical transmission quarry trucks under a license agreement with NMC also organized Le Tourneau Technologies, Inc., a subsidiary of Joy Global (USA), which produces mining equipment. The pioneer of the establishment and implementation of SRD medium and high power in Russia is the school of electricians SRSTU (NPI), Novocherkassk, which was founded by Professor L.F. Kolomeitsev. Experience in the development and introduction of valve-inductor electric drives medium and high power based on the classic inductor machines with axial excitation have also scientists of the National Research University "MEI". The conclusion of the feasibility of broader deployment, production and marketing of this innovative technology.

Selection of rational parameters of electromechanical transmissions of tracked vehicles

Data obtained from an experimental research of electric drive with molecular energy storage permits to conclude that using of the capacitive storage as a part of electromechanical transmission is appropriate. Proposals concerning organization of automated system of motion control for a tracked vehicle equipped with electromechanical transmission using molecular energy storage are developed.

Innovative solutions from Privodnaya Tekhnika

This article presents the main technical solutions for electrical transmission of a tractor. The tractor electric drive is based on a switched-reluctance electric drive. The structure of electromechanical transmission is reviewed. Modelling of the main operation modes of the electric drive and calculation of its basic parameters were carried out in the MathCad and MATLAB programs. To verify the electric drive parameters taking into account the general and local saturation of the electromechanical transducer magnetic system, the Ansys software package was used. It is shown that the constructed electric drive has weight-size parameters that are 30–50% better than in the case of a traditional induction motor drive. The same parameters can be achieved on the base of the field regulated reluctance machine drive with retention of qualities that are important to consumers.

A Development of the Distributive Law of Points on the Multi-Wheeled Machine Wheels with Electro-Mechanical Transmission, Made Under the Scheme "Motor-Axis"

A Development of the Distributive Law of Points on the Multi-Wheeled Machine Wheels with Electro-Mechanical Transmission, Made Under the Scheme "Motor-Axis"

Повышение устойчивости и управляемости многоосных колесных машин с электромеханической трансмиссией, выполненной по схеме «мотор–ось»

Повышение устойчивости и управляемости многоосных колесных машин с электромеханической трансмиссией, выполненной по схеме «мотор–ось»

Asymptotic analysis of a multimaterial with a thin piezoelectric interphase

We study the electromechanical behavior of a multimaterial constituted by a linear piezoelectric transversely isotropic plate-like body with high rigidity embedded between two generic three-dimensional piezoelectric bodies by means of the asymptotic expansion method. After defining a small real dimensionless parameter \(\varepsilon \), which will tend to zero, we characterize the limit model and the associated limit problem. We give also a mathematical justification of the model by means of a functional convergence argument. Moreover, we identify the non classical electromechanical transmission conditions between the two three-dimensional bodies.

An asymptotic model of a multimaterial with a thin piezoeletric interphase

We study the electromechanical behavior of a multimaterial constituted by a linear piezoelectric transversely isotropic plate-like body with high rigidity embedded between two generic three-dimensional piezoelectric bodies by means of the asymptotic expansion method. After defining a small real dimensionless parameter ε, which will tend to zero, we characterize the limit model and the associated limit problem. Moreover, we identify the non-classical electromechanical transmission conditions between the two three-dimensional bodies.

Electromechanical Hybrid Transmission Control System of Tension Leveler

For tension roller skidding and motor alarm phenomenon often appeared in the process of straightening. This paper take electromechanical hybrid drive system of tension leveler as example, analysis the control system, focusing on the dynamic tension load distribution, points out that the above situation can be avoid effectively by setting the parameter of tension reasonably. And the same time, speed control and torque control are analyzed in this paper, and it provides a reference for the further study of electromechanical hybrid transmission control system.

Закон управления с функцией систем активной безопасности для электромеханических трансмиссий многоосных колесных машин

Закон управления с функцией систем активной безопасности для электромеханических трансмиссий многоосных колесных машин

Duplex electromechanical transmission with automatic control system

Electromechanical transmission with automatic module control system including power and technological channels is suggested. Algorithm for resistance determination during segmentary-finger mover operation taking into account power expenditures for driving moment and angular velocity fluctuations is given. Operating ranges of mobile power module with mover mechanical drive and standard Т-25А tractor with КС-2,1 mover were compared.

Design and Analysis of a Novel Structure Form of Electro-Mechanical Transmission

In order to search after a new way of the propulsion system of tracked vehicle, a novel structure form of electro-mechanical transmission was developed in this paper, through analyzing the advantages and disadvantages of existing projects of electric drive system for tracked vehicle. It could increase the rate of power exertion obviously and synthesize the mechanical and electrical strongpoint. And based on the structure form, an electro-mechanical transmission was designed with double electromotor added planetary mechanism of steering power coupling and gearshift, considering engineering realization. And then straight-line driving and steering performances of the transmission were calculated which proved that the novel electro-mechanical transmission could meet the requirement of tracked vehicle propulsion well.

ВИЗНАЧЕННЯ ГЕОМЕТРИЧНИХ ПАРАМЕТРІВ БЛОКА-МОДУЛЯ ЛІНІЙНОГО ТЯГОВОГО ЕЛЕКТРОДВИГУНА ГУСЕНИЧНОЇ МАШИНИ

The method of preliminary determination of the basic geometric parameters of vehicle tractive linear electromotor block module structural elements is examined in the article. The vehicle is equipped with electromechanical transmission which based on direct linear electric drive of the track. The preliminary determination of the basic parameters of the linear tractive electromotor block-module is considered by the design features of the high-speed vehicle track mover. And the track-link elements of track mover are the moving parts of the magnetic circuit. These are the characteristic features of described method.

Analysis method and principle of dual-mode electro-mechanical variable transmission program

Automotive industry, as an important pillar of the national economy, has been rapidly developing in recent years. But proplems such as energy comsumption and environmental pollution are posed at the same time. Electro-mechanical variable transmission system is considered one of avilable workarounds. It is brought forward a kind of design methods of dual-mode electro-mechanical variable transmission system rotational speed characteristics and dual-mode drive diagrams. With the motor operating behavior of running in four quadrants and the speed characteristics of the simple internal and external meshing single planetary gear train, four kinds of dual-mode electro-mechanical transmission system scheme are designed. And the velocity, torque and power characteristics of one of the programs are analyzed. The magnitude of the electric split-flow power is an important factor which influences the system performance, so in the parameters matching design, it needs to reduce the power needs under the first mode of the motor. The motor, output rotational speed range and the position of the mode switching point have relationships with the characteristics design of the planetary gear set. The analysis method is to provide a reference for hybrid vehicles’ design. As the involved rotational speed and torque relationships are the natural contact of every part of transmission system, a theory basis of system program and performance analysis is provided.