COMPENSATION OF ELASTIC VIBRATIONS OF INDUSTRIAL MECHANISMS

The method of compensation of elastic vibrations of electric drives of industrial positioning mechanisms, as well as methods for assessing the level of these vibrations are shown. It is proposed to choose the parameters of the electric motor and the mechanism optimal according to the criterion of minimum vibrations at the design stage of the displacement mechanisms. Positioning mechanisms of the "actuator" type with screw –nut transmission make it possible to implement this approach

CONSTRUCTION OF ROTOR ANGLE IDENTIFIER IN VECTOR CONTROL SYSTEMS OF DOUBLE FEED MACHINES

In asynchronous electric drives with vector control on the rotor, it is necessary to calculate the value of the sine and cosine of the angle of rotation of the rotor relative to the stator to form control actions. When using angle sensors, complex structural tasks can arise — placement and reliable mounting of the sensor on the shaft and, accordingly, the task of the overall layout of the unit. For high-power machines, the tasks of developing and creating the design of the sensor itself arise. If serial rotor angular position sensors can be used, the task of placing and mounting the sensor is no less difficult. In these cases it is necessary to deduce the second end of a shaft from the case of the engine with contact rings that complicates its design. Therefore, the urgent need to create more reliable electric drives with vector control systems on the rotor is the synthesis of identifiers of the angle of rotation of the rotor. Identifiers are known whose calculation algorithms are based on determining the projections of the flow coupling vectors. In the work with the use of coordinate transducers of projections of stator or rotor current vectors and equations of electromagnetic circuits of an asynchronous machine, the synthesis and subsequent analysis of the properties of the rotor position angle identifier in vector control systems of dual power machines is performed. New equations of the identifier of flux couplings are received, its stability is investigated and on conditions of stability types of electric drives in which it is possible to apply the offered identifier are defined. The stability of the vector control system and sufficient identification accuracy when using the proposed equations and functions are confirmed by the method of mathematical modeling of the recommended electric drive systems in different operating modes.

COMPARATIVE ANALYSIS OF CONTROL SYSTEMS FOR A VOLTAGE SOURCE INVERTERS FOR AC DRIVES

The brief survey of electric drives implicated in both industry and transport are carried out. The results of comparison of control systems of a voltage source inverters included in an electric drive system with an asynchronous or synchronous motor are presented. The results were obtained by means of Matlab.

RESEARCH OF THE SYSTEM OF AUTOMATIC CONTROL OF THE THREAD TENSION SPEED IN THE SPINNING PROCESS

The paper deals with the creation of a mathematical model of the process of stretching the tape, taking into account the tension of the thread. For this purpose, the relationship between the thread tension and the speed of expression of the electric drives is determined. The proposed mathematical model of the process allows one to synthesize highly efficient control systems for spinning equipment.

MATHEMATICAL SIMULATION OF INDUCTION MOTOR SCALAR CONTROL SYSTEM

The simulation results of 4 kW induction motor electric drive with scalar control system and different control topologies are presented. The perspective directions of further investigations on improving energy efficiency of electric drives with scalar control systems are highlighted.

A Multi-Objective Design Optimization for a Permanent Magnet Synchronous Machine with Hairpin Winding Intended for Transport Applications

Nowadays, interest in electric propulsion is increasing due to the need to decarbonize society. Electric drives and their components play a key role in this electrification trend. The electrical machine, in particular, is seeing an ever-increasing development and extensive research is currently being dedicated to the improvement of its efficiency and torque/power density. Among the winding methods, hairpin technologies are gaining extensive attention due to their inherently high slot fill factor, good heat dissipation, strong rigidity, and short end-winding length. These features make hairpin windings a potential candidate for some traction applications which require high power and/or torque densities. However, they also have some drawbacks, such as high losses at high frequency operations due to skin and proximity effects. In this paper, a multi-objective design optimization is proposed aiming to provide a fast and useful tool to enhance the exploitation of the hairpin technology in electrical machines. Efficiency and volume power density are considered as main design objectives. Analytical and finite element evaluations are performed to support the proposed methodology.