Model Based Design of Electric drives

Electric drives are probably the most widelyused electronic devices in the industry. The developmentprocess of the drives is very time-intensive, but there aremany methods to reduce the development time. In thispaper, the development of vector control of inductionmachine using Simulink is presented. Firstly, the creation ofthe simulation model is described; then the same model isused for code generation. We used the dSpace platform;however, any platform supported by Matlab/Simulink canbe used as well. Finally, the comparison of results betweensimulation and real motor is presented

Real-Time Implementation of the Advanced Control of the Three-Phase Induction Machine Based on Power Inverters

The fast growing development of both the numerical equipment and power electronics allows the rapid prototyping of the innovating idea. The objective of this chapter is to put into evidence the teaching aspects through the applicative research in the field of the electric drives. The chapter provides the basic and advanced aspects of the electric drives control based on the most used electrical machine: three-phase induction motor (IM). The research work is presented in didactical way, starting with the conventional vector control, followed by the integration of the model reference adaptive control into the specific IM-based drive. The verified numerical simulation results push the research process through the implementation way. In order to increase the IM drives efficiency, the real-time implementation of the most commonly used modulation techniques is provided. Based on the dSpace platform, interfaced by ControlDesk, the experimental results are obtained. Both the performances of the cascaded control and model reference adaptive control are shown

Investigation of Model Reference Parameter Adaptive SRM Drives

Nowadays switched re luctance motor (SRM) drives have been widely used in the field of controlled electric motor drives. The paper proposes a m odel reference adaptive control method for SRM drives. The main goal of the drive control is to improve dynamical performance by compensating for the motor nonlinearities. The r ipple free operation can be realize only w ith an current waveform depending on the angle, speed and torque. The proposed ripple reduced meth od changes only the turn-on and the turn-off angle in functio n of the speed and current reference. One of the advantages of using the ripple –reduced method that it does not need the real-time calculation or measuring the motor torque. So it can be implemented on a cheap microcontroller. The test of this control method was performed in an experimental d rive system. A SRM of 6/8 pole and 4 kW rated power was used. Simulation and experimental results are presented

Optical fibre sensing: A solution for industry

Optical fibres have been explored widely for their sensing capability to meet increasing industrial needs, building on their success in telecommunications. This paper provides a review of research activities at City University of London in response to industrial challenges through the development of a range of fibre Bragg grating (FBG)-based sensors for transportation structural monitoring. For marine propellers, arrays of FBGs mapped onto the surface of propeller blades allow for capturing vibrational modes, with reference to simulation data. The research funded by EU Cleansky programme enables the development of self-sensing electric motor drives to support 'More Electric Aircraft' concept. The partnership with Faiveley Brecknell Willis in the UK enables the integration of FBG sensors into the railway current-collecting pantographs for real-time condition monitoring when they are operating under 25kV conditions

Electric elevator drive with position control

This thesis is a study on the implementation of an elevator’s position-controlled electric drive. The information contained within this paper serves as a framework to expand the usefulness of electric drives through the addition of digital control systems and switching power supplies. The tangible example of an elevator driven by a permanent-magnet DC motor is used for this paper so that students may relate to the work and apply it to their future projects. The tasks to be accomplished in order to achieve an electric elevator drive with position control are: determining the parameters of the permanent-magnet DC motor, designing a control system to direct the motor as desired, and verifying the performance of the system through use of computer simulations and experimental testing. The tests to derive the motor parameters as well as the theory behind the test are covered in depth before the design procedures for creating a cascaded control system are started. Computer simulations are conducted using the parameters and controllers which will be implemented in real-time before experimental testing in the lab begins. Conclusions are drawn about the performance of the position-controlled electric elevator drive based upon the simulation and experimental results. The implementation of an elevator driven by a permanent-magnet DC motor with position control is successful and provides an illustrative example to those who wish to apply electric drives to various mechanical system

Development of the luenberger observer for the automated electric drive of hermetic compressor

The basic requirements for control systems of automated electric drives of hermetic compressors of small refrigeration units are determined. The analysis of the existing sensorless control systems of three-phase AC drives is carried out. The topology of the adaptive Luenberger observer is proposed, which allows real-time evaluation of the current value of the rotational speed and torque on the shaft of the hermetic compressor motor. Based on the linearized model of a three-phase asynchronous motor, the Luenberger observer is synthesized by the modal method with the distribution of the roots of the characteristic polynomial in the standard linear Bessel form. Expressions are obtained for calculating the coefficients of the Luenberger matrix and the geometric mean root of the characteristic polynomial of the observer. To ensure the necessary accuracy of identifying the coordinates of the state of an automated electric drive of a hermetic compressor, an observer structure is proposed based on a complete mathematical model of a three-phase asynchronous motor made in a fixed coordinate system. Using simulation tools, the work of the designed Luenberger observer is studied on the example of a modernized three-phase asynchronous motor of a hermetic compressor of a domestic refrigerator. For this example, the coefficients of the Luenberger matrix and the geometric mean root of the characteristic polynomial of the observer are calculated. The effectiveness of the proposed method for identifying the rotational speed and moment of resistance of a compressor electric motor by an adaptive observer based on the calculation of the electromagnetic torque of the motor from measured sensors of phase voltages and currents is confirmed. The error of the observer under investigation does not exceed 0.5 % in rotation frequency and 10 % in respect to the moment of resistance. The resulting structure of the adaptive Luenberger observer allows to build closed-loop control systems for automated electric drives of the hermetic compressor of a small refrigeration unit

Research of a bi-directional DC-DC converter integrated in electric car power installation

This article presents the results of the simulation study of the bi-directional DC converter, including the time diagrams of the electric vehicle speed, voltage and current changes in various experiments, Also presented are the results of efficiency change and charge level, when using a bi-directional converter as well as without using it. The HFEDC (Highway Fuel Economy Driving Schedule) model was chosen for the simulation of the electric vehicle drive model using units simulating standardized driving cycles and as an algorithm for changing the vehicle's control signal. Studies of the operating modes of the electrical equipment and the electric vehicle with the DC voltage conversion device in the power circuit of the DC source have been carried out by computer simulation in specialized programs for the study of dynamic systems. The simulation model of the reversible DC converter in the electrical power equipment of an electric vehicle was constructed on the basis of mathematical models of the individual elements reflecting their real physical properties. The present solution is the use of two-way DC voltage converters in the power conversion systems of modern electric drives, including the electric propulsion systems of prospective vehicles improves the efficiency of these systems. © Published under licence by IOP Publishing Ltd