Three-axis adjustable loading structure

A three axis adjustable loading structure for testing the movable surfaces of aircraft by applying pressure, is described. The device has three electric drives where the wall angle, horizontal position, and vertical position of the test device can be rapidly and accurately positioned

Linear electric drives for constructional purposes

The paper discusses designing, modeling and application of electric drives with linear induction motors for constructional purposes: high voltage line fault localizing and shunting system of power supply for site, application of thyristors to shunt phase fault, horizontal transport systems with linear electric drives of constructional equipment for transportation of materials, and vertical transport systems with linear electric drives of constructional materials, review of design methods of special linear induction drives, transient responces of linear induction drive

Электроприводы малой мощности на основе бесконтактных двигателей с постоянными магнитами

The paper is concerned with the developments of low power electric drives on the basis of permanent magnet brushless motors. Parameters of brushless motors are given. Functional schemes of the electric drives on the basis of permanent magnet brushless motors are described

Обзор систем управления и исполнительных устройств электроприводов повышенной точности, построенных по итерационному принципу

Article is devoted to the electric drives accuracy and speed increase structural ways review. Realization of an iterative principle of functional interaction of several independent channels of electric drives control is considered. Historical and technical aspects of iterative multichannel automatic control systems development, and also their modern condition are described

Mathematical model of mechanical parts interconnected electric drives of head and lift in rock digger

The need for development of new approach to modelling lift and head electric drives of quarry digger in the process of digging has been justified. The differences of the mathematical model suggested from the traditional approach are shown. The disadvantages of existing control systems in digger electric drives are revealed, the method of their removing is proposed

Prospects of Hybrid Systems on Agricultural Machinery

“Hybrid system” is an actual catchword and it has entered agricultural engineering. Many projects dealing with electric drives on agricultural machines have been presented in the recent years. Their advantages are exact controllability, speed variability and overload capability. So called agro-hybrid-structures can be derived from automotive-hybrid-systems. The functionality strongly depends on the structure of the system. The use of electric drives appears to be promising in dedicated applications, where infinitely variable hydrostatic drives can be replaced and new functionalities can be realized. This paper considers selected hybrid-structures and -functions on the example of a tractor. Furthermore the potential of electric drives from the view of European manufacturers of agricultural machinery is reported

The comparative analysis of energetic characteristics of variable-frequency electric drives with direct torque control

The simulation models of variable-frequency electric drives with direct torque control were built in MATLAB / Simulink simulation environment. These models are shown and described in the article. А number of energetic characteristics of the electric drives being investigated are considered. The calculations of these characteristics were made on the computer models and the comparative analysis of the values obtained is given

Short and long term vision on improvements in bus transport

In a short term view, any experiment with electric buses results in more knowledge: electric drives, auxiliary equipment, brake energy recovery, city centres, tourist areas. Do we have to retrofit with single motor? But 2 or 4 motors are better. The longer term technical possibilities are discussed: City Bus, Long distance bus-coach, High efficiency and low weight electric drives. All transport means should reduce weight

Real-time model of synchronous reluctance motor drive for laboratory based investigations

The Synchronous Reluctance Motor has received much attention in recent years as a very promising solution for electric drives in the near future. This paper presents a real-time model of the motor to be implemented into a software environment used for DSP control system development including debugging. The model is used in laboratory based investigations in academia in order to analyse the performance of electric drives based on a synchronous reluctance motor