The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform
Ibon Elosegui - One of the best experts on this subject based on the ideXlab platform.
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analytical calculation of the slot leakage inductance in fractional slot concentrated Winding Machines
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Borja Prieto, Miguel Martineziturralde, Luis Fontan, Ibon EloseguiAbstract:This paper obtains analytical expressions for the calculation of the slot leakage inductance for fractional-slot concentrated-Winding (FCSW) Machines with one-, two-, or four-layer Windings. The formulas are derived from solving the 2-D Poisson problem associated with the slot region, making them more accurate than classically used expressions that assume a leakage flux path parallel to the placement of the conductors in the slot. Explicit formulas are given in the case of one- and two-layer FSCWs with a number of phases ranging from 3 to 7. The obtained analytical expressions are validated by a finite-element analysis, showing excellent agreement between both calculation methods, even for large slot-opening-to-slot-pitch ratios. A brief comment with regard to the fault-tolerant capability of permanent-magnet FSCW Machines with respect to the number of layers is also given.
Thiago Dutra - One of the best experts on this subject based on the ideXlab platform.
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thermal conductivity evaluation of fractional slot concentrated Winding Machines
IEEE Transactions on Industry Applications, 2017Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:The use of fractional-slot concentrated Windings (FSCW) in electrical Machines allows more compact, efficient, and reliable design with respect to Machines equipped with distributed Windings. However, an electromagnetic design linked to a thermal analysis of the electrical machine is mandatory to achieve the desired performance, and to fulfill the requirements of efficiency and reliability. One of the most critical issues in thermal design of electrical Machines is to assign fair values for the input parameters of the thermal simulation models, particularly those related to the stator Winding insulation system. This paper deals with the assessment of the equivalent thermal conductivity of the insulation system of FSCW Machines. For this purpose, three FSCW electrical Machines for different applications were evaluated via an experimental method based on a dc thermal transient test. Whereas the investigated Machines present different characteristics among themselves, different approaches were required to properly estimate the thermal conductivity.
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thermal parameters evaluation for stator fractional slot concentrated Winding Machines
International Symposium on Industrial Electronics, 2016Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:The aim of this paper is the determination of the thermal parameters and thermal coefficients for a fractional-slot concentrated Winding machine. In previous papers, the authors presented a detailed analysis of the values obtained for Machines equipped with distributed Windings. Since the two Winding topologies have a complete different realization, it has been mandatory to validate the approach proposed for distributed Windings even in the case of concentrated Windings. In this sense, the experimental tests and the model validation have been performed using a reduced-scale prototype of a generator properly designed for aircraft applications. The machine is equipped with single-layer fractional-slot concentrated Windings and the coils are produced using Litz wire. The obtained results indicate that the proposed method to estimate the thermal parameters and coefficients for distributed Winding Machines can be used for this specific fractional-slot concentrated Winding machine as well.
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Thermal parameters evaluation of a fractional-slot concentrated Winding machine for home appliance applications
2016 XXII International Conference on Electrical Machines (ICEM), 2016Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:Efficiency and reliability of electrical Machines are considerably affected by their thermal performance, therefore, thermal simulation models have been developed to support the thermal design of electrical Machines. However, the adoption of reasonable values to represent the input thermal parameters required in such simulations is as important as the modeling strategy itself. This paper deals with the determination of thermal parameters concerning a Fractional-Slot Concentrated Winding “FSCW” electrical machine properly designed for home appliance applications. Equivalent thermal resistance and capacitance of the Winding insulation system composed by Winding, impregnation, and coil support are evaluated. In addition, the equivalent thermal conductivity value has been assessed using a novel approach suitable for FSCW Machines. A critical analysis of the obtained results has been conducted and it has shown that the equivalent thermal conductivity of the FSCW machine is up to two times higher than the values obtainable for conventional distributed Winding Machines.
Mi-chi Tsai - One of the best experts on this subject based on the ideXlab platform.
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Wire tension control of an automatic motor Winding machinean iterative learning sliding mode control approach
Robotics and Computer-Integrated Manufacturing, 2018Co-Authors: Ming-yang Cheng, Mi-chi TsaiAbstract:This paper focuses on active wire tension control of motor Winding Machines.An ILSMC scheme for wire tension control is developed.A disturbance observer is used to implement sensorless wire tension control.The estimated wire speed is exploited in designing the tension control scheme.The stability and convergence proof of the proposed approach is provided. One of the most crucial factors that affects the Winding quality in an automatic motor Winding process is the regulation of wire tension. Most commercial automatic motor Winding Machines use passive devices such as a dancer arm or a hysteresis brake to adjust the wire tension. However, as the Winding speed increases, these passive devices may not be able to react quickly enough to maintain constant wire tension and may cause the enameled wire to tremble. In order to cope with the aforementioned problems, this paper conducts an in-depth study on active wire tension control of automatic motor Winding Machines. In particular, an iterative learning sliding mode control scheme for wire tension control is developed in this paper, while a disturbance observer is employed to estimate the wire tension for the implementation of sensorless wire tension control. Moreover, due to the fact that the motion of the unwind roll is affected by the motion of the enameled wire, the estimated wire speed information is exploited in the design of the tension control scheme to lessen the lag phenomenon. Results of the Winding experiments verify the effectiveness of the proposed wire tension control scheme.
Borja Prieto - One of the best experts on this subject based on the ideXlab platform.
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analytical calculation of the slot leakage inductance in fractional slot concentrated Winding Machines
IEEE Transactions on Industrial Electronics, 2015Co-Authors: Borja Prieto, Miguel Martineziturralde, Luis Fontan, Ibon EloseguiAbstract:This paper obtains analytical expressions for the calculation of the slot leakage inductance for fractional-slot concentrated-Winding (FCSW) Machines with one-, two-, or four-layer Windings. The formulas are derived from solving the 2-D Poisson problem associated with the slot region, making them more accurate than classically used expressions that assume a leakage flux path parallel to the placement of the conductors in the slot. Explicit formulas are given in the case of one- and two-layer FSCWs with a number of phases ranging from 3 to 7. The obtained analytical expressions are validated by a finite-element analysis, showing excellent agreement between both calculation methods, even for large slot-opening-to-slot-pitch ratios. A brief comment with regard to the fault-tolerant capability of permanent-magnet FSCW Machines with respect to the number of layers is also given.
Aldo Boglietti - One of the best experts on this subject based on the ideXlab platform.
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thermal conductivity evaluation of fractional slot concentrated Winding Machines
IEEE Transactions on Industry Applications, 2017Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:The use of fractional-slot concentrated Windings (FSCW) in electrical Machines allows more compact, efficient, and reliable design with respect to Machines equipped with distributed Windings. However, an electromagnetic design linked to a thermal analysis of the electrical machine is mandatory to achieve the desired performance, and to fulfill the requirements of efficiency and reliability. One of the most critical issues in thermal design of electrical Machines is to assign fair values for the input parameters of the thermal simulation models, particularly those related to the stator Winding insulation system. This paper deals with the assessment of the equivalent thermal conductivity of the insulation system of FSCW Machines. For this purpose, three FSCW electrical Machines for different applications were evaluated via an experimental method based on a dc thermal transient test. Whereas the investigated Machines present different characteristics among themselves, different approaches were required to properly estimate the thermal conductivity.
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thermal parameters evaluation for stator fractional slot concentrated Winding Machines
International Symposium on Industrial Electronics, 2016Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:The aim of this paper is the determination of the thermal parameters and thermal coefficients for a fractional-slot concentrated Winding machine. In previous papers, the authors presented a detailed analysis of the values obtained for Machines equipped with distributed Windings. Since the two Winding topologies have a complete different realization, it has been mandatory to validate the approach proposed for distributed Windings even in the case of concentrated Windings. In this sense, the experimental tests and the model validation have been performed using a reduced-scale prototype of a generator properly designed for aircraft applications. The machine is equipped with single-layer fractional-slot concentrated Windings and the coils are produced using Litz wire. The obtained results indicate that the proposed method to estimate the thermal parameters and coefficients for distributed Winding Machines can be used for this specific fractional-slot concentrated Winding machine as well.
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Thermal parameters evaluation of a fractional-slot concentrated Winding machine for home appliance applications
2016 XXII International Conference on Electrical Machines (ICEM), 2016Co-Authors: Aldo Boglietti, Marco Cossale, Silvio Vaschetto, Thiago DutraAbstract:Efficiency and reliability of electrical Machines are considerably affected by their thermal performance, therefore, thermal simulation models have been developed to support the thermal design of electrical Machines. However, the adoption of reasonable values to represent the input thermal parameters required in such simulations is as important as the modeling strategy itself. This paper deals with the determination of thermal parameters concerning a Fractional-Slot Concentrated Winding “FSCW” electrical machine properly designed for home appliance applications. Equivalent thermal resistance and capacitance of the Winding insulation system composed by Winding, impregnation, and coil support are evaluated. In addition, the equivalent thermal conductivity value has been assessed using a novel approach suitable for FSCW Machines. A critical analysis of the obtained results has been conducted and it has shown that the equivalent thermal conductivity of the FSCW machine is up to two times higher than the values obtainable for conventional distributed Winding Machines.
