EPE Association: EPE 2018 - DS1g: Electrical Machines

EPE 2018 - DS1g: Electrical Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 04: Electrical Machines and Drive Systems > EPE 2018 - DS1g: Electrical Machines

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   Analytical tool for initial estimation of mechanical stress in high-speed bearingless permanent magnet rotors
By Devika USHAKUMARI [View]
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Abstract: Bearingless drives are a good choice in high-speed applications due to the absence of mechanical friction, vibration control, and smaller machine footprint. However, electromechanical rotor structure optimization is challenging. An analytical tool to predict the initial mechanical stress in high-speed permanent magnet rotors of bearingless drives is proposed in this paper. The tool developed in Matlab is verified with the help of finite element based software Ansys. Two different test cases such as geometry test and speed test were framed to do the testing. Moreover, a correction factor is introduced in the code from the speed test results to improve the accuracy. The reliability of this factor is validated by using the same factor for different geometries in geometry test. The analytical tool developed gave faster and moderately accurate results on testing.

   Determining the Volume Optimal Parameter Values for Multi-Phase Permanent Magnet Synchronous Motors with Switchable Coil Configuration
By Miriam BOXRIKER [View]
[Download]

Abstract: This contribution suggests an approach to determine the optimal parameter values of permanent magnetflux linkage and saliency ratio of Permanent Magnet Synchronous Motors with multi-phase windingsand coil configuration switching. Therein, their influence on volume is calculated analytically for bothmotor and power electronics in a unified manner identifying promising designs. Of the exemplary designparameters, a maximum volume reduction of 27\% can be achieved. An experimental validation supportsthe analytic calculation of the motor torque vs. speed behavior.

   Effect of Torsional Interactions on the Output Impedance of PMSG-Based Wind Turbines
By Aram KHODAMORADI [View]
[Download]

Abstract: This paper investigates the output impedance of a permanent magnet synchronous generator (PMSG) indq reference frame, taking the torsional interactions into account. The dynamic behavior of the PMSGdrive-train is modelled through both one-mass and two-mass mechanical models. The obtained model isincluded in the overall output impedance of a grid-connected wind energy conversion system (WECS).According to the analytical model found in this paper, which is also verified by simulation results inMatlab/Simulink, low frequency resonances may appear in the output impedance of the WECS, due totorsional interactions.

   Equivalent Circuit Analysis of an Ultra-Lightweight Motor Designed with Magnetic Resonance Coupling
By Kenta TAKISHIMA [View]
[Download]

Abstract: Electric aircraft may reduce the environmental impact of next-generation transportation technologies. In order to put electric aircraft into practical use, the weight of electric motors must be reduced dramatically. To produce an ultra-lightweight motor, we propose a novel motor that eschews the magnetic cores typically used in induction-motor designs. This article studies a motor design that exploits magnetic resonance coupling to transmit power from coil to coil across an air gap efficiently. This article describes the design concept for such a novel motor and formalizes its equivalent circuit. Then finite-element analysis is used to validate that the equivalent circuit represents the behavior of a realistic magnetic resonance coupling motor. The results indicate that the proposed motor can efficiently achieve high-power density, and the equivalent circuit formalized in this article can be used for further analysis in the design of such a motor.

   Fast numerical calculation of the back-emf of permanent magnet synchronous machine
By Jan LAKSAR [View]
[Download]

Abstract: In this paper, the calculation of the back electromotive force (emf) is presented. The back-emf waveform is evaluated by own analytical and numerical calculations based on the air-gap flux density distribution described in previous papers. These calculations are improved for the surface-mounted PMSM model by the usage of simple magnetic equivalent circuit. The results of both methods are compared with values obtained by finite element analysis. Two different models of the PMSM are used; 4-pole PMSM1 with fractional-slot concentrated winding placed in 6 semiclosed slots and 10-pole PMSM2 with distributed winding placed in 60 open slots.

   Induction Motor Efficiency Verification Using a Balance-Type Calorimeter Equipped with a Mass Flow Meter
By Hannu KÄRKKÄINEN [View]
[Download]

Abstract: Determination of losses accurately is challenging for today's high-efficiency power electronics and motors. Due to the limitations of the typically used input-output method, other loss measurement methods have been designed. Here, the efficiency of a direct-on-line induction motor prototype is determined using the IEC loss segregation method, the input-output method, and with a balance type calorimeter. The calorimetric results are further analyzed with the help of a mass flow meter that is used to verify the loss results obtained using the balance test.

   Sensorless On-line Rotor Parameter Detection of Induction Machines Based on Inverter Excitation
By Walter FAHRNER [View]
[Download]

Abstract: This study presents a new online rotor resistance/temperature detection technique for utilization inspeed sensorless control. The technique proposed is based on analysis and exploitation of inherentmachine saliencies. For exploitation of the machine saliencies, a transient voltage pulse excitationmethod was accomplished. Influence of temperature on saliency parameters are utilized to adjust rotorparameters in order to establish accurate control performance. Measurement results presented, verifythe accuracy of the proposed method by comparing estimated and sensor-based values of torque andslip.

   Two ways of acquisition of experimental results of an Induction machine
By Rahims GEIDAROVS [View]
[Download]

Abstract: In this current paper is given a consideration of two ways of getting experimental results of an induction machine (IM). The first way are experimental results based on standard IEC 60034-28:2012 [1] and the second way are experimental results gained from direct rotor current and resistivity measurements.

EPE 2018 - DS1g: Electrical Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 04: Electrical Machines and Drive Systems > EPE 2018 - DS1g: Electrical Machines
	[return to parent folder]

	Analytical tool for initial estimation of mechanical stress in high-speed bearingless permanent magnet rotors By Devika USHAKUMARI	[View] [Download]
Abstract: Bearingless drives are a good choice in high-speed applications due to the absence of mechanical friction, vibration control, and smaller machine footprint. However, electromechanical rotor structure optimization is challenging. An analytical tool to predict the initial mechanical stress in high-speed permanent magnet rotors of bearingless drives is proposed in this paper. The tool developed in Matlab is verified with the help of finite element based software Ansys. Two different test cases such as geometry test and speed test were framed to do the testing. Moreover, a correction factor is introduced in the code from the speed test results to improve the accuracy. The reliability of this factor is validated by using the same factor for different geometries in geometry test. The analytical tool developed gave faster and moderately accurate results on testing.

	Determining the Volume Optimal Parameter Values for Multi-Phase Permanent Magnet Synchronous Motors with Switchable Coil Configuration By Miriam BOXRIKER	[View] [Download]
Abstract: This contribution suggests an approach to determine the optimal parameter values of permanent magnetflux linkage and saliency ratio of Permanent Magnet Synchronous Motors with multi-phase windingsand coil configuration switching. Therein, their influence on volume is calculated analytically for bothmotor and power electronics in a unified manner identifying promising designs. Of the exemplary designparameters, a maximum volume reduction of 27\% can be achieved. An experimental validation supportsthe analytic calculation of the motor torque vs. speed behavior.

	Effect of Torsional Interactions on the Output Impedance of PMSG-Based Wind Turbines By Aram KHODAMORADI	[View] [Download]
Abstract: This paper investigates the output impedance of a permanent magnet synchronous generator (PMSG) indq reference frame, taking the torsional interactions into account. The dynamic behavior of the PMSGdrive-train is modelled through both one-mass and two-mass mechanical models. The obtained model isincluded in the overall output impedance of a grid-connected wind energy conversion system (WECS).According to the analytical model found in this paper, which is also verified by simulation results inMatlab/Simulink, low frequency resonances may appear in the output impedance of the WECS, due totorsional interactions.

	Equivalent Circuit Analysis of an Ultra-Lightweight Motor Designed with Magnetic Resonance Coupling By Kenta TAKISHIMA	[View] [Download]
Abstract: Electric aircraft may reduce the environmental impact of next-generation transportation technologies. In order to put electric aircraft into practical use, the weight of electric motors must be reduced dramatically. To produce an ultra-lightweight motor, we propose a novel motor that eschews the magnetic cores typically used in induction-motor designs. This article studies a motor design that exploits magnetic resonance coupling to transmit power from coil to coil across an air gap efficiently. This article describes the design concept for such a novel motor and formalizes its equivalent circuit. Then finite-element analysis is used to validate that the equivalent circuit represents the behavior of a realistic magnetic resonance coupling motor. The results indicate that the proposed motor can efficiently achieve high-power density, and the equivalent circuit formalized in this article can be used for further analysis in the design of such a motor.

	Fast numerical calculation of the back-emf of permanent magnet synchronous machine By Jan LAKSAR	[View] [Download]
Abstract: In this paper, the calculation of the back electromotive force (emf) is presented. The back-emf waveform is evaluated by own analytical and numerical calculations based on the air-gap flux density distribution described in previous papers. These calculations are improved for the surface-mounted PMSM model by the usage of simple magnetic equivalent circuit. The results of both methods are compared with values obtained by finite element analysis. Two different models of the PMSM are used; 4-pole PMSM1 with fractional-slot concentrated winding placed in 6 semiclosed slots and 10-pole PMSM2 with distributed winding placed in 60 open slots.

	Induction Motor Efficiency Verification Using a Balance-Type Calorimeter Equipped with a Mass Flow Meter By Hannu KÄRKKÄINEN	[View] [Download]
Abstract: Determination of losses accurately is challenging for today's high-efficiency power electronics and motors. Due to the limitations of the typically used input-output method, other loss measurement methods have been designed. Here, the efficiency of a direct-on-line induction motor prototype is determined using the IEC loss segregation method, the input-output method, and with a balance type calorimeter. The calorimetric results are further analyzed with the help of a mass flow meter that is used to verify the loss results obtained using the balance test.

	Sensorless On-line Rotor Parameter Detection of Induction Machines Based on Inverter Excitation By Walter FAHRNER	[View] [Download]
Abstract: This study presents a new online rotor resistance/temperature detection technique for utilization inspeed sensorless control. The technique proposed is based on analysis and exploitation of inherentmachine saliencies. For exploitation of the machine saliencies, a transient voltage pulse excitationmethod was accomplished. Influence of temperature on saliency parameters are utilized to adjust rotorparameters in order to establish accurate control performance. Measurement results presented, verifythe accuracy of the proposed method by comparing estimated and sensor-based values of torque andslip.

	Two ways of acquisition of experimental results of an Induction machine By Rahims GEIDAROVS	[View] [Download]
Abstract: In this current paper is given a consideration of two ways of getting experimental results of an induction machine (IM). The first way are experimental results based on standard IEC 60034-28:2012 [1] and the second way are experimental results gained from direct rotor current and resistivity measurements.