Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation
This paper undertakes the thermal and electrical characterization of three commercial unsaturated polyester imide resins (UPIR) to identify which among them could better perform the insulation function of electric motors (high-power induction motors fed by pulse-wide modulation (PWM) inverters). The...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/6/1374 |
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| author | Elisa Calabrese Marialuigia Raimondo Michelina Catauro Luigi Vertuccio Patrizia Lamberti Raffaele Raimo Vincenzo Tucci Liberata Guadagno |
| author_facet | Elisa Calabrese Marialuigia Raimondo Michelina Catauro Luigi Vertuccio Patrizia Lamberti Raffaele Raimo Vincenzo Tucci Liberata Guadagno |
| author_sort | Elisa Calabrese |
| collection | DOAJ |
| description | This paper undertakes the thermal and electrical characterization of three commercial unsaturated polyester imide resins (UPIR) to identify which among them could better perform the insulation function of electric motors (high-power induction motors fed by pulse-wide modulation (PWM) inverters). The process foreseen for the motor insulation using these resins is Vacuum Pressure Impregnation (VPI). The resin formulations were specially selected because they are one-component systems; hence, before the VPI process, they do not require mixing steps with external hardeners to activate the curing process. Furthermore, they are characterized by low viscosity and a thermal class higher than 180 °C and are Volatile Organic Compound (VOC)-free. Thermal investigations using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) techniques prove their excellent thermal resistance up to 320 °C. Moreover, impedance spectroscopy in the frequency range of 100 Hz–1 MHz was analyzed to compare the electromagnetic performance of the considered formulations. They manifest an electrical conductivity starting from 10<sup>−10</sup> S/m, a relative permittivity around 3, and a loss tangent value lower than 0.02, which appears almost stable in the analyzed frequency range. These values confirm their usefulness as impregnating resins in secondary insulation material applications. |
| first_indexed | 2024-03-11T06:00:05Z |
| format | Article |
| id | doaj.art-4bc139cdd1af4d58836c103da1ff9b85 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-11T06:00:05Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-4bc139cdd1af4d58836c103da1ff9b852023-11-17T13:24:39ZengMDPI AGPolymers2073-43602023-03-01156137410.3390/polym15061374Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor InsulationElisa Calabrese0Marialuigia Raimondo1Michelina Catauro2Luigi Vertuccio3Patrizia Lamberti4Raffaele Raimo5Vincenzo Tucci6Liberata Guadagno7Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma 29, 81031 Aversa, ItalyDepartment of Engineering, University of Campania “Luigi Vanvitelli”, Via Roma 29, 81031 Aversa, ItalyDepartment of Information and Electrical Engineering and Applied Mathematics, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Information and Electrical Engineering and Applied Mathematics, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Information and Electrical Engineering and Applied Mathematics, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyDepartment of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, ItalyThis paper undertakes the thermal and electrical characterization of three commercial unsaturated polyester imide resins (UPIR) to identify which among them could better perform the insulation function of electric motors (high-power induction motors fed by pulse-wide modulation (PWM) inverters). The process foreseen for the motor insulation using these resins is Vacuum Pressure Impregnation (VPI). The resin formulations were specially selected because they are one-component systems; hence, before the VPI process, they do not require mixing steps with external hardeners to activate the curing process. Furthermore, they are characterized by low viscosity and a thermal class higher than 180 °C and are Volatile Organic Compound (VOC)-free. Thermal investigations using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) techniques prove their excellent thermal resistance up to 320 °C. Moreover, impedance spectroscopy in the frequency range of 100 Hz–1 MHz was analyzed to compare the electromagnetic performance of the considered formulations. They manifest an electrical conductivity starting from 10<sup>−10</sup> S/m, a relative permittivity around 3, and a loss tangent value lower than 0.02, which appears almost stable in the analyzed frequency range. These values confirm their usefulness as impregnating resins in secondary insulation material applications.https://www.mdpi.com/2073-4360/15/6/1374insulating materialspolyester resinsthermal analysesVacuum Pressure Impregnation (VPI)PWM-fed motors |
| spellingShingle | Elisa Calabrese Marialuigia Raimondo Michelina Catauro Luigi Vertuccio Patrizia Lamberti Raffaele Raimo Vincenzo Tucci Liberata Guadagno Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation Polymers insulating materials polyester resins thermal analyses Vacuum Pressure Impregnation (VPI) PWM-fed motors |
| title | Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation |
| title_full | Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation |
| title_fullStr | Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation |
| title_full_unstemmed | Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation |
| title_short | Thermal and Electrical Characterization of Polyester Resins Suitable for Electric Motor Insulation |
| title_sort | thermal and electrical characterization of polyester resins suitable for electric motor insulation |
| topic | insulating materials polyester resins thermal analyses Vacuum Pressure Impregnation (VPI) PWM-fed motors |
| url | https://www.mdpi.com/2073-4360/15/6/1374 |
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