In this thesis a sensorless field oriented control of permanent magnet synchronous machine for blower applications opearting in a wide range of speeds is presented. At low speeds of rotation, volume air flow through the blower is very small, therefore, blowers operate predominantly at higher speeds. Consequently, sensorless control issue of this work is focused on higher speeds and on field weakening control of the synchronous machine. Presented sensorless field oriented control is suitable for general industrial use. Due to its relative simplicity, it can also be used in low-cost industrial applications. The blower first starts up to a certain speed of rotation with the open speed control loop. At sufficient speed of rotation, the speed control loop is closed. The machine rotor position and the speed of rotation, is obtained by the PLL observer. One of the central parts of this thesis is the sensitivity analysis, given for two different PLL observer structures. Based on given analysis, the PLL observer structure, which is suitable for the use in a wide range of speeds, is selected. A wide range of speed of rotation is achieved with the new field weakening control structure of the permanent magnet synchronous machine, where all the available dc-bus voltage of inverter is exploited. Further, stability analysis of the new filed weakening control structure is made. Based on the performed analysis guidelines for the proper choice of parameters for the field weakening control structure are given, so that the stable operation of the machine is assured. The results of simulations and experiments are compared for the new and allready existing field weakening control structure. The comparison shows, that when the new field weakening control structure is applied, the transition of the machine between the constant torque and field weakening region of operation is smoother. At the end, the proposed sensorless field oriented control using the PLL observer and the new field weakening control structure is verified experimentally, on the blower, operating in a broad range of speeds.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 265977600The competence centre “CC-SURE - Advanced Systems of Efficient Use of Electrical Energy” as one of the key national linking mechanisms is active since 2011 and includes 16 partners active in the field of efficient use of electrical energy. TECES is the competence center holder and activity coordinator, UM-FERI and DOMEL are partners. The CC-SURE main aim is to establish the Smart Grid concept through a comprehensive approach by including the production, distribution and the usage of electric energy. This will enable the verification of partners’ solutions and confirming the suitability of the newly developed partner products, which are suitable to be employed in smart electric power networks of the future. Several work packages are implemented within the CC-SURE programme, where DOMEL and UM-FERI focus on the activities of Energy efficient electric drive converters. More information is available at the website http://www.sure.si. The in 2012 successfully finished project “CESLA - Cross-border implementation of environmentally friendly ultra-light vehicles in Slovenia and Austria” represented one of the forerunning electric mobility projects in Podravje, Carinthia and Styria. Its achievements and results proved to have high impact on successive activities in the aforementioned regions and the broader environment. The partnership included 4 partners from Slovenia and 2 partners from Austria, of which TECES as the lead partner and UM-FERI as project partner still play the most significant role in Slovenia. The project’s main aim was to encourage the use of more sustainable means of personal transport in daily commuting and recreational use by demonstration of effective use of smaller and lighter zero-emission vehicles, based on electric propulsion. More information is available at the website http://www.cesla.eu .
D.01 Chairing over/coordinating (international and national) projects
During the implementation of activities of the applied-research project, the project team members have acquired and mastered new knowledge in the filed of sensorless control of BLDC drives and the control of electric machines at high rotation speed. The most important scientific-research contribution of the project is the development of a novel control algorithm for electric machines in the field-weakening regime. The algorithm has been tested in the BLDC drive up to the speed of 20.000 rpm. The resulting scientific conclusions and the experience gathered at the practical implementation of the algorithm in a digital signal processor are indispensable in further development of high speed applications of all project partners, and above of all for the project beneficiary DOMEL. Based on the project results, a patent application has been filed as well. The patent will be granted in May 2013, and then it will be visible in the patent database also.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 69091329The newly proposed control approach will be used in a family of converters for blowers of the company DOMEL. These converters are used in the heating, ventilation and air-conditioning industry for drives with motors ranging from 1,6 kW and up to 5,5 kW. Until the implementation of the applied-research project, DOMEL has offered motors for such drives only - without the converter in most segments. The project results enable that the project beneficiary DOMEL offers the integral family of complete blower drives on the market under its own trademark, i.e. the motor with an adequate and competitive converter in all segments.
F.04 Increase of the technological level
The principal investigator and members of the research project group have actively participated in the programme, editorial and organising committee of the professional conference »SPOT 2012 – Innovative Electric Energy Converters«, which was held at the 13th and 14th June, 2012 in Nova Gorica. All partners of the applied research project have been included in the organisation of the conference, TECES as the main organiser, UM-FERI and DOMEL with others as co-organisers. The purpose of the conference was to provide an insight into the Slovenian electrical industry in the field of electric energy converters, to identify development challenges of the Slovenian economy and strengthen mutual development cooperation of companies and research organisations in order to make Slovenian products competitive in the rapidly changing field of electric energy converters. The event attracted 157 participants. More information is available at the website http://spot-2012.teces.si .
F.17 Transfer of existing technologies, know-how, methods and procedures into practice