| EPE 2019 - DS1f: Electrical Machines | ||
| You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2019 ECCE Europe - Conference > EPE 2019 - Topic 04: Electrical Machines and Drive Systems > EPE 2019 - DS1f: Electrical Machines | ||
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 | A comprehensive approach to calculation of permanent magnet losses
By Karel HRUSKA | |
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Abstract: The permanent magnet losses are a problem related to all types of permanent magnet machines - permanent magnet synchronous machines, brushless direct current machines as well as flux-switching permanent magnet machines. These losses arise from time-variable magnetic field acting together with self permanent magnet field. The results are eddy eddy currents flowing through the volume of permanent magnets causing resistive losses and heating the permanent magnets. This paper describes a possibility of analytical calculation of permanent magnet losses arising both from geometry of the machine and from the power supply for the purpose of accurate determination of heat generated in the rotor volume.
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| | A Design for High Performance of a Half-Wave Rectified Variable Field Flux Motor
By Takashi ABE | |
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Abstract: Due to the demands of expanding the high efficiency area and controllable torque / speed area, the new concept variable field flux motors have been researched. We also proposed a variable field flux motor with a half-wave rectified brushless self-excitation method. This motor is possible to construct a brushless self-excited by connecting a diode in series with the field winding on the rotor. And it is possible to excite and control the rotor field flux by the stator winding current. This paper describes the influence of the rotor and stator core design on the torque and efficiency characteristic for proposed motor. And the final designed model is shown with motor parameters. Further, the variable field flux characteristics of the designed motor are confirmed by electromagnetic field analysis.
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| | An explanation of asymmetric mutual inductances in Brushless Doubly Fed Reluctance Machines
By David GAY | |
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Abstract: Standard double fed induction machines (DFIM) have symmetric stator - rotor side parameters when they have the same turns per phase. Additionally, the magnetising inductance looking from either the stator or rotor perspective is identical. This is not so for the Brushless Doubly Fed Reluctance Machine (BDFRM). Coupling of flux between equivalent stator and rotor windings occurs at sideband frequencies due to an air-gap flux modulation process, a consequence of differing stator winding, rotor winding and reluctance rotor pole numbers [1]. This paper examines the modulation to explain the mutual inductance asymmetry found in experimental results.
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| | Analysis of the effects of parameter variations on the start-up characteristics of LSPMSM
By Johann PECHO | |
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Abstract: Based on the numerical solution, this paper describes the analysis of the impact of rotor anisotropy and moment of inertia on the synchronization capability of Line Starting Permanent Magnet Synchronous Machines (LSPMSM). Coming from an induction motor the studies reveal an effect that is not known from the theory of the induction motors. In addition to start-up, synchronization is a key development aspect. This paper examines the synchronization process and reveals its constraints.It also shows the influence of the so-called 'Goerges'-phenomenon on speed and torque during start-up. The aim of the work is to improve the knowledge and prediction of the characteristics and properties of this type of machine.
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| | Comparison between a bearingless PM motor with separated and combined winding for torque and lateral force generation
By Daniel DIETZ | |
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Abstract: This work compares two geometrically identical bearingless permanent magnet synchronous machines in a slotted cylindrical design, one equipped with two separated torque and suspension windings and one equipped with a single combined winding. It is found that the combined winding is superior in terms of thermal utilization and manufacturing effort.
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| | Comparison of MTPA and Minimum Loss Control for Tooth Coil Winding PMSM Considering PM and Inverter Losses
By Alessandro ACQUAVIVA | |
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Abstract: This paper presents a comparison between MTPA and minimum loss control including the PM and inverter losses for a tooth coil winding PMSM. Tooth coil winding machines can have significant iron and PM losses due to space harmonics generated by the stator winding distribution. Both these loss contributions should be taken into account when evaluating the control strategy. Depending on the machine design and in particular the magnetic and electric loading, the advantage of using a minimum loss control can vary. Two case studies for an electric vehicle application are presented and the advantage of using the minimum loss control is quantified and analyzed for different drivecycles showing energy savings up to 6\% on low speed drive-cycles and up to 13\% for high speed drive-cycles.
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| | CURRENTS AND POWER LOSSES OF INDUCTION MACHINE UNDER VOLTAGE INTERHARMONICS
By Piotr GNACINSKI | |
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Abstract: This works deals with the effect of moment of load inertia on currents and power losses of a cageinduction motor supplied with voltage containing voltage interharmonics. The results of fieldcalculations are presented for a machine of rated power 3 kW and interharmonic of variousfrequencies. The applied field model was implemented in ANSYS Maxwell environment andexperimentally verified.
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| | Design and Analysis of an Extended Kalman-Filter for Self-Sensing of a Synchronous Reluctance Motor with Connected Inverter Output Filter
By Philipp KAPPES | |
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Abstract: For self-sensing control of a synchronous reluctance machine connected to the inverter via a LC-_lteran extended Kalman-Filter is designed in this paper. Thereby, only the inverter output current is mea-sured. The parameters of the extended Kalman-Filter (EKF) are chosen by a brute-force optimizationapproach with a multiple quality criteria. For implementation purpose, the discretization of the observeris discussed. The functionality of the optimized parameter set is investigated in simulated closed loopself-sensing control.
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| | DESIGN AND TEST OF A NOVEL DIRECT-ON-LINE SYNCHRONOUS RELUCTANCE MOTOR
By Alessandro CASTAGNINI | |
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Abstract: This paper presents a novel design for direct-on-line (DOL) Synchronous Reluctance motors, using optimal rotor lamination design for both the synchronous structure and the asynchronous part that guarantees the DOL starting capability. Pros and cons of the approach are highlighted and analysis outcome is compared with prototype test results.
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| | Design of Rotors for Synchronous Reluctance Motor: Analytical Treatment and Optimization
By Svetlana ORLOVA | |
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Abstract: Various rotor designs have been investigated for synchronous reluctance motor (SynRM). In the investigation, the rotor geometry parameters are presented in view of the influence exerted on the d-axis and q-axis inductance of SynRMs, and an optimum combination of design parameters has been achieved for improvement the saliency ratio as well as the performance of the machine.
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| | Estimation of Synchronous Motor Air-Gap Torque in DOL Start-Up Operation from Manufacturer Data Sheet Parameters
By Lorenzo BONGINI | |
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Abstract: The direct-on-line start-up of a synchronous motor results in alternating torques which can excite the lowest torsional natural frequency of compressor trains used in the oil & gas industry. Considering a slip-dependent variation of the rotor parameters, an integrated electrical and mechanical simulation model is developed, providing an accurate estimation of the air-gap torque. The proposed approach is validated by an accurate testing campaign carried out during moto-compressor field test activities.
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| | Hydrothermal Performance of Ethylene Glycol and Water Mixture in a Spiral Channel for Electric Motor Cooling
By Ali DERISZADEH | |
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Abstract: This paper investigates the feasibility of a direct liquid cooling technique for the thermal managementsystem of an electrical machine for automotive application. The cooling system is a closed liquid coolantloop employing a mixture of Ethylene Glycol and water as a coolant. General performance of the coolingsystem at different volume fractions of mixture of Ethylene Glycol and water is evaluated. Variousgeometry of the cooling system, and physical characteristics of the coolant fluid are studied. Thermalanalyses of the cooling system are performed using computational fluid dynamics and 3D turbulent fluidmotion analysis. According to analysis, influence of the critical parameters on the performance of thecooling system is studied.
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| | Improved MRAS Control of Permanent Magnet Synchronous Motor Based on A New Voltage Model in High Power Applications
By Shijiong ZHOU | |
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Abstract: This paper presents a speed identification method based on the model reference adaptive system (MRAS) of Permanent Magnet Synchronous Motor (PMSM). A stator flux observer based on a new voltage model is designed, using the compensation algorithm for the orthogonality of stator flux and back EMF. This paper designs an improved MRAS model based on this new voltage model and it takes the flux linkage as the state variable in the aß0 coordinate system. A sensorless vector control system for PMSM is constructed. Simulation results of the drive performance in MATLAB/Simulink are presented. Finally, this method has been applied to the high-power application, combined with a three-level inverter. The experiment has been carried out with DSP28335 as the core of the control circuit of the platform. Results indicate the correctness of the theoretical analysis.
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| | Integrated Motor-Controlled Independently by Multi-Inverters with Pole and Phase Changes
By Kazuto SAKAI | |
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Abstract: A motor operating with high efficiency at variable speed essentially contributes to the energy saving of drive systems. For electric vehicles in particular, motor operation over a wide speed range is achievable through a highly efficient variable-speed drive, for instance, by changing the number of poles. To achieve high performance with pole and phase changes and obtain low-torque ripple, we proposed a motor with two or three winding groups combined with two or three inverters and had them operated under individual current control. The results of this study confirmed that the technique of both the multi inverter and multi winding allows the motor to change the number of poles and phases. In particular, the motor changing operation from 8 poles to 4 would lead to a decrease to half of the iron loss, which indicates that the motor can be expected to operate with high efficiency as it changes a high pole to a low pole at the operational region of high rotational speed.
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| | Measurement Accuracy Requirements for the Efficiency Classification of Converters and Motors
By Lassi AARNIOVUORI | |
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Abstract: Electrical machines play a major role in the electrical energy consumption in the modern world; therefore, the efficiency of electrical machines has been regulated for a long time by different authorities. Recently, the international efficiency classes for converters and converter-fed machine packages were introduced by IEC. The increased efficiency of the devices creates a challenge for accurate loss and efficiency determination of these devices. This paper examines the measurement accuracy of the direct-on-line and converter-fed electrical machines, frequency converters, and converter-fed machine packages from a theoretical basis. The measurement uncertainty is presented as a function of the rated powers of the devices and as a function of the efficiency classes.
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| | Nanofluids for Rotating Electrical Machines Cooling: Perspectives and Challenges
By Silvio VASCHETTO | |
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Abstract: Nanofluids seem to show enhanced properties compared to base fluids in which nanoparticles are dispersed. For this reason, researchers are investigating their application in different engineering fields. However, their use for cooling rotating electrical machines has obtained limited interest so far. This paper presents a survey on the different features of nanofluids, as well as a brief review on some applications in the mechanical and electrical engineering fields. Then, the authors provide some preliminary analyses on using nanofluids for standard water-jacket electrical machines. On the basis of these preliminary evaluations, perspectives and challenges for their fruitful use in rotating electrical machines are drawn.
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| | Simple Sensorless Drive Method for Permanent Magnet Synchronous Motors Using Flux Vector Control
By Junki YOSHIMOTO | |
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Abstract: This paper proposes a simple sensorless drive method for permanent magnetic synchronous motors using flux vector control. Stable, high-efficiency operation and a discretization error compensation method can be achieved by gain design based on the analysis, application of armature flux reaction control and discretization error compensation method.
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