Browsing by Author "Hinkkanen, Marko"

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  • AC/DC-hybridimikroverkkojen nykytila ja haasteet
    (2013-05-30) Laiho, Mika
     Sähkötekniikan korkeakoulu | Bachelor's thesis
  • Adaptation of motor parameters in sensorless PMSM drives
    (2009-01-20) Piippo, Antti; Hinkkanen, Marko; Luomi, Jorma
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This paper proposes an online method for the estimation of the stator resistance and the permanent-magnet (PM) flux in sensorless PM synchronous motor drives. An adaptive observer augmented with a high-frequency signal injection technique is used for sensorless control. The observer contains excess information that is not used for the speed and position estimation. This information is used for the adaptation of the motor parameters: At low speeds, the stator resistance is estimated, whereas at medium and high speeds, the PM flux is estimated. Small-signal analysis is carried out to investigate the proposed method. The convergence of the parameter estimates is shown by simulations and laboratory experiments. The stator resistance adaptation works down to zero speed in sensorless control.
  • Adaptive full-order observer with high-frequency signal injection for synchronous reluctance motor drives
    (2014-04-04) Tuovinen, Toni; Hinkkanen, Marko
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A back electromotive force-based position observer for motion-sensorless synchronous reluctance motor (SyRM) drives is augmented with high-frequency signal-injection method for improved low-speed operation. Previously proposed observer structure is further improved to account for the cross saturation in the motor. The combined observer is experimentally evaluated using a 6.7-kW SyRM drive in low-speed operation and under various load conditions. The resulting position error at low speeds and standstill is small.
  • Adaptive Full-Order Observer With High-Frequency Signal Injection for Synchronous Reluctance Motor Drives
    (2014) Tuovinen, Toni; Hinkkanen, Marko
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A back electromotive force-based position observer for motion-sensorless synchronous reluctance motor (SyRM) drives is augmented with high-frequency signal-injection method for improved low-speed operation. Previously proposed observer structure is further improved to account for the cross saturation in the motor. The combined observer is experimentally evaluated using a 6.7-kW SyRM drive in low-speed operation and under various load conditions. The resulting position error at low speeds and standstill is small.
  • Adaptive Full-Order Observer With High-Frequency Signal Injection for Synchronous Reluctance Motor Drives
    (2014) Tuovinen, Toni; Hinkkanen, Marko
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A back electromotive force-based position observer for motion-sensorless synchronous reluctance motor (SyRM) drives is augmented with high-frequency signal-injection method for improved low-speed operation. Previously proposed observer structure is further improved to account for the cross saturation in the motor. The combined observer is experimentally evaluated using a 6.7-kW SyRM drive in low-speed operation and under various load conditions. The resulting position error at low speeds and standstill is small.
  • Analysis and design of a position observer with resistance adaptation for synchronous reluctance motor drives
    (2011) Tuovinen, Toni; Hinkkanen, Marko; Luomi, Jorma
     School of Electrical Engineering | A4 Artikkeli konferenssijulkaisussa
    A back-EMF-based reduced-order position observer with stator-resistance adaptation is analyzed for motion-sensorless synchronous reluctance motor drives. Analytical equations for steady-state estimation errors and stability conditions are derived (with and without resistance adaptation), taking into account errors in the parameter estimates. The effect of the observer gain on the noise reduction is studied by means of eigenvector analysis. A robust gain selection is proposed, which maximizes the allowed uncertainties in the parameter estimates. The proposed observer design is experimentally evaluated using a 6.7-kW synchronous reluctance motor drive; stable operation is demonstrated at low speeds under various parameter errors.
  • Analysis and design of a position observer with resistance adaptation for synchronous reluctance motor drives
    (2013-01-16) Tuovinen, Toni; Hinkkanen, Marko; Luomi, Jorma
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A back-electromotive-force-based reduced-order position observer with stator-resistance adaptation is analyzed for motion-sensorless synchronous reluctance motor (SyRM) drives. Analytical equations for steady-state estimation errors and stability conditions are derived (with and without resistance adaptation), taking into account errors in the parameter estimates. The effect of the observer gain on the noise reduction is studied by means of eigenvector analysis. A robust gain selection is proposed, which maximizes the allowed uncertainties in the parameter estimates. The proposed observer design is experimentally evaluated using a 6.7-kW SyRM drive; stable operation is demonstrated at low speeds under various parameter errors.
  • Analysis and Design of a Position Observer With Resistance Adaptation for Synchronous Reluctance Motor Drives
    (2013) Tuovinen, Toni; Hinkkanen, Marko; Luomi, Jorma
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    A back-electromotive-force-based reduced-order position observer with stator-resistance adaptation is analyzed for motion-sensorless synchronous reluctance motor (SyRM) drives. Analytical equations for steady-state estimation errors and stability conditions are derived (with and without resistance adaptation), taking into account errors in the parameter estimates. The effect of the observer gain on the noise reduction is studied by means of eigenvector analysis. A robust gain selection is proposed, which maximizes the allowed uncertainties in the parameter estimates. The proposed observer design is experimentally evaluated using a 6.7-kW SyRM drive; stable operation is demonstrated at low speeds under various parameter errors.
  • Analysis and design of a position observer with stator-resistance adaptation for PMSM drives
    (2010) Hinkkanen, Marko; Tuovinen, Toni; Harnefors, Lennart; Luomi, Jorma
     School of Electrical Engineering | A4 Artikkeli konferenssijulkaisussa
    This paper deals with reduced-order observers with stator-resistance adaptation for motion-sensorless permanent-magnet synchronous motor drives. An analytical solution for the stabilizing observer gain and stability conditions for the stator-resistance adaptation are derived. The proposed observer design is experimentally tested using a 2.2-kW motor drive; stable operation at very low speeds under different loading conditions is demonstrated.
  • Analysis and Design of Full-Order Flux Observers for Sensorless Induction Motors
    (2004) Hinkkanen, Marko
     School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This paper deals with the flux estimation for sensorless induction motor drives. The linearized model of the speedadaptive full-order flux observer is applied to help choosing the observer gain and the speed-adaptation gains. It is shown that the linearized model reveals potential instability problems that are difficult to find by other means. An observer gain and a method to vary the speed-adaptation gains in the field-weakening region are proposed. Experimental results show stable operation in a very wide speed range.
  • Analysis and design of full-order flux observers for sensorless induction motors
    (2004-10-04) Hinkkanen, Marko
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This paper deals with the flux estimation for sensorless induction motor drives. The linearized model of the speed-adaptive full-order flux observer is applied to help choosing the observer gain and the speed-adaptation gains. It is shown that the linearized model reveals potential instability problems that are difficult to find by other means. An observer gain and a method to vary the speed-adaptation gains in the field-weakening region are proposed. Experimental results show stable operation in a very wide speed range.
  • Analysis of a multi-axis machinery drive system with a common DC bus and regenerative capabilities
    (2013-05-20) Sapone, Marco
     Sähkötekniikan korkeakoulu | Master's thesis
    This research deals with the study of a multi-axis machinery focusing on the analysis of the drive system. Nowadays in industrial applications the energy management of converters and motors is a major point of concern, therefore it is particularly desirable to evaluate an upgrade of an existing machine with an old fashion drive system. Along this study the focus point is mainly directed on the energy management of the machine motors and frequency converters in order to reduce the energy consumption of an existing multi-axis machine used for mechanical testing of optical fiber. A more efficient electrical structure and motor axis control is presented. Since the multi-axis machinery under study uses axes in motoring and braking mode, it is particularly suitable for a future upgrade using a centralized multi-drive system. The main aim of this research is to understand how different drives interact while connected to a common DC bus, how the DC voltage can be controlled and how the surplus energy can be either used by other motoring loads or fed back to the network. The study will be considered from different points of view: from the economical aspect to reduce energy consumption with a new drive system. From the technical point of view, dealing with the dimensioning of the drive system, with the aim to reduce the required space and simplify the system structure. From the control point of view, the control technology involved with the energy regenerative features and drives control is presented. Simulation of the mechanical and electrical system will be conducted and measurements performed on the running machine in order to verify the simulated results. Finally the results will be used to predict the energy consumption and cost variations using different drive configurations.
  • Analytical method for design and thermal evaluation of a long-term flywheel energy storage system
    (2016-06-22) Sokolov, Maksim A.; Jastrzebski, Rafal P.; Saarakkala, Seppo E.; Hinkkanen, Marko; Mystkowski, Arkadiusz; Pyrhönen, Juha J.; Pyrhönen, Olli
     A4 Artikkeli konferenssijulkaisussa
    This paper presents a novel analytical method for electro-mechanical design of a high speed long-term flywheel energy storage system and thermal evaluation of possible operating modes of the system. Flywheel’s composite shell rotor along with the motor/generator unit are assumed to be placed into a sealed vacuum chamber, which presents a challenge of heat transfer, produced by rotor losses. Developed method takes into account thermal radiation properties of the rotor and is realised using Mathcad software, which allows for quick investigation of any flywheel configuration. The method involves calculations for preliminary rotor sizing and determining achievable operation modes, while keeping the rotor under a specified temperature limit. Results of using this method for studying dependencies of thermal performance on initial system parameters are presented and conclusions are drawn. Based on the conducted study, recommendations on system design considerations are given.
  • Analytical model including rotor eccentricity for bearingless synchronous reluctance motors
    (2018-09-03) Saarakkala, Seppo E.; Mukherjee, Victor; Sokolov, Maksim; Hinkkanen, Marko; Belahcen, Anouar
     A4 Artikkeli konferenssijulkaisussa
    This paper deals with modelling of rotor eccentricity in a dual three-phase winding bearingless synchronous reluctance motors (BSyRMs). The motor includes two separate sets of three-phase windings: one for torque production and the other one for radial force production. For this motor, an improved analytical model with linear magnetic material is presented. The accuracy of the model depends on the accuracy of the inverse-airgap function. Typically, a series expansion is used for approximating the inverse-airgap function. In order to make the main-winding inductances depend on the radial position, at least the first two terms have to be included in the expansion, enabling calculation of the radial forces caused by unbalanced magnetic pull. The improved model is applicable, e.g., for stability analysis, time-domain simulations, or developing real-time control methods.
  • Analytical Modeling of a Six-Phase Bearingless Synchronous Reluctance Machine Using Winding Function Theory
    (2023-12-29) Ahmed, Firdausa; Martin, Floran; Das, Nirangkush; Hinkkanen, Marko
     A4 Artikkeli konferenssijulkaisussa
    This paper presents a modeling framework for bearingless synchronous reluctance machines that are equipped with a six-phase stator winding. The six-phase combined winding can be used to produce both electromagnetic torque and radial forces. Vector-space decomposition (or generalized space-vector transformation) and winding function theory are applied in the presented framework. To exemplify these concepts, a conceptual machine is studied by means of analytical expressions and by finite-element analysis. The presented framework can be used to develop dynamic models for other multiphase bearingless machines as well. Resulting dynamic models can be used in time-domain simulations and in development of real-time control algorithms.
  • Apparatus for Measuring Air Gap and Rotor Position in Linear Motors
    (2017-08-28) Piitulainen, Henry
     Sähkötekniikan korkeakoulu | Master's thesis
    This thesis studies inductive air gap and rotor position sensing in linear motors. The object is to find a sensing apparatus for an industrial application. Therefore, inductive sensing is studied and requirements for the sensing apparatus are defined. Inductive position sensing is further developed to suit the application, a sensing apparatus is designed and a prototype is manufactured. Also, a test arrangement is designed and built and the prototype is tested. Test results verify that the designed sensing apparatus meets the requirements and a further development could be worthwhile.
  • Asset inventory management in cyber security process development in marine vessel projects
    (2023-03-20) Kukkonen, Joona
     Sähkötekniikan korkeakoulu | Master's thesis
    Increased risk of cyber incidents in the maritime industry drives the standardization towards improved requirements in enhanced risk assessment and mitigation activities. Asset inventory management is one of the cyber security processes that should be applied to marine vessel projects to be compliant with prevalent standards. Firstly, this thesis focuses on reviewing standards and requirements that affect computer-based systems (CBSs) on-board marine vessels. After initial review, this information is taken into practise in a case study where cyber security process of a maritime company is developed in an agile project management application. In the study, focus sets on developing an enhanced process based on previous experience and related literature. Once the developed process is evaluated, it is piloted in a real marine vessel project. Results indicate that application of agile methodologies with a comprehensive but precise cyber security process is applicable for maritime companies. Most importantly, the developed process improved collaboration between different parties involved and shifted workload from the end of projects to the whole lifecycle of marine vessel projects. Nevertheless, a novel work environment has its challenges such as reluctance at the initial stages of implementation. With a supportive training material and general guidelines as well as continuous development, the process can be further polished to fit for most of the stakeholders involved. For further development, technologies such as radio frequency identification (RFID) could be utilized to automate data collection from CBSs for cyber security compliance. Together with an agile information security management system and a working cyber security process maritime companies will be prepared for safer shipping in the future.
  • Asymmetric complex-vector models with application to VSC–grid interaction
    (2020-02-06) Harnefors, Lennart; Wang, Xiongfei; Chou, Shih-Feng; Bongiorno, Massimo; Hinkkanen, Marko; Routimo, Mikko
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The properties of complex space-vector models for asymmetric three-phase systems are investigated in this article. Most importantly, three alternative methods for the stability analysis of the asymmetric closed-loop systems are presented. The end results avoid the usage of matrix manipulations. It is shown how the theory can be applied to modeling and stability analysis of a grid-connected voltage-source converter (VSC). The methods are compared using numerical examples.
  • Automated Verification Setup for Current Measurement of AC Drive
    (2023-01-23) Zhegrova, Labinot
     Sähkötekniikan korkeakoulu | Master's thesis
    The objective is to derive an automated pipeline for testing of current measurement in variable frequency drives. The tests that are automated are gain error, non-linearity, and crosstalk tests. Accurate current measurement is important for controlling the electric motor. The test setup includes a variable frequency drive, the contactor controller device, and the power supply. A power supply injects the current into the variable frequency drive output phase, and the current direction is controlled by contactors. Current measurement accuracy can be verified when comparing the values retrieved from the variable frequency drive with the real current values measured from the power supply. To automate the setup, the communication between the devices and the computer must be synchronized. Python-based Robot Framework software is used to automate the tests. Automation is beneficial for providing faster test results to the developer team.
  • Automatic Torque Ripple Reduction in Permanent Magnet Machines
    (2020-08-17) Airaksinen, Joni
     Sähkötekniikan korkeakoulu | Master's thesis
    This thesis investigates the feasibility of Q-learning for torque ripple reduction with industrial permanent magnet (PM) machines. A practical Q-learning based compensator is implemented and the ripple reduction performance is compared against conventional PI speed control and iterative learning control (ILC). Performance of the Q-learning based method is evaluated by rigorous simulations and experiments. The results confirm the applicability of the Q-learning based method. The compensation performance is similar to ILC. In certain operating conditions, the Q-learning based method can outperform the ILC compensator.