https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Mon, 15 Jun 2026 23:32:38 GMT 2026-06-15T23:32:38Z http://hdl.handle.net/10985/23007 Temperature-dependent modelling of magnetic ageing of FeSi electrical steels HELBLING, H.; TOTO JAMIL, Meryeme; DUMONT, Myriam; BENABOU, Abdelkader; CLENET, Stephane This paper deals with the temperature-dependent modelling of iron losses in the context of magnetic ageing of electricals steel used in high power electrical machines. First, two electrical steel sheet grades were heat treated at three temperatures in order to study the ageing effect evolution as a function of temperature. Results show a significant increase in iron losses for both steel grades. Then, considering the link between the macroscopic magnetic properties evolution (effect) and the microscopic precipitation (cause), the Johnson – Mehl – Avrami – Kolmogorov (JMAK) law describing the kinetics of precipitation was applied to model the time evolution of magnetic ageing. By coupling this model with the Arrhenius’ law, a model is developed to be able to predict the ageing for several temperature levels. Thu, 01 Dec 2022 00:00:00 GMT http://hdl.handle.net/10985/23007 2022-12-01T00:00:00Z HELBLING, H. TOTO JAMIL, Meryeme DUMONT, Myriam BENABOU, Abdelkader CLENET, Stephane This paper deals with the temperature-dependent modelling of iron losses in the context of magnetic ageing of electricals steel used in high power electrical machines. First, two electrical steel sheet grades were heat treated at three temperatures in order to study the ageing effect evolution as a function of temperature. Results show a significant increase in iron losses for both steel grades. Then, considering the link between the macroscopic magnetic properties evolution (effect) and the microscopic precipitation (cause), the Johnson – Mehl – Avrami – Kolmogorov (JMAK) law describing the kinetics of precipitation was applied to model the time evolution of magnetic ageing. By coupling this model with the Arrhenius’ law, a model is developed to be able to predict the ageing for several temperature levels. http://hdl.handle.net/10985/20123 Development and validation of an electrical and magnetic characterization device for massive parallelepiped specimens TOTO JAMIL, Meryeme; BENABOU, Abdelkader; CLENET, Stephane; ARBENZ, Laure; MIPO, Jean-Claude Claw pole (CP) machine performances are strongly related to the electromagnetic properties of ferromagnetic materials. These properties are impacted by the manufacturing processes, in a heterogeneous way, as well as by the thermal behavior of the machine and mechanical constraints. Due to the complexity of CP geometry, extracted samples cannot respect the dimensions prescribed in international standards of electric and magnetic measurements. This paper proposes a specific methodology to characterize the electrical conductivity and the magnetic behavior of massive parallelepiped specimens extracted from different locations of a CP rotor. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/20123 2019-01-01T00:00:00Z TOTO JAMIL, Meryeme BENABOU, Abdelkader CLENET, Stephane ARBENZ, Laure MIPO, Jean-Claude Claw pole (CP) machine performances are strongly related to the electromagnetic properties of ferromagnetic materials. These properties are impacted by the manufacturing processes, in a heterogeneous way, as well as by the thermal behavior of the machine and mechanical constraints. Due to the complexity of CP geometry, extracted samples cannot respect the dimensions prescribed in international standards of electric and magnetic measurements. This paper proposes a specific methodology to characterize the electrical conductivity and the magnetic behavior of massive parallelepiped specimens extracted from different locations of a CP rotor. http://hdl.handle.net/10985/20121 Magneto-thermal characterization of bulk forged magnetic steel used in claw pole machine TOTO JAMIL, Meryeme; BENABOU, Abdelkader; CLENET, Stephane; SHIHAB, Sylvain; LE BELLU ARBENZ, Laure; MIPO, Jean-Claude During the operation of Claw Pole (CP) machines, and for some operating loads, the magnetic core temperature can reach 180°C in some hot spots. As a consequence, the core electromagnetic properties may considerably change, impacting the machine performances. In such a case, a deep knowledge of the electromagnetic behavior as a function of the temperature is required. In this paper, we present a dedicated study of the CP rotor made from a forged magnetic steel. In fact, the CP magnetic properties heterogeneity and the claw shape made it necessary to extract specific samples that are characterized with a miniaturized Single Sheet Tester (SST). To that end, this work proposes a specific methodology to characterize the electromagnetic properties of the CP rotor material as a function of the temperature in order to better predict the machine electrical performances, especially regarding the iron losses. Wed, 01 Jan 2020 00:00:00 GMT http://hdl.handle.net/10985/20121 2020-01-01T00:00:00Z TOTO JAMIL, Meryeme BENABOU, Abdelkader CLENET, Stephane SHIHAB, Sylvain LE BELLU ARBENZ, Laure MIPO, Jean-Claude During the operation of Claw Pole (CP) machines, and for some operating loads, the magnetic core temperature can reach 180°C in some hot spots. As a consequence, the core electromagnetic properties may considerably change, impacting the machine performances. In such a case, a deep knowledge of the electromagnetic behavior as a function of the temperature is required. In this paper, we present a dedicated study of the CP rotor made from a forged magnetic steel. In fact, the CP magnetic properties heterogeneity and the claw shape made it necessary to extract specific samples that are characterized with a miniaturized Single Sheet Tester (SST). To that end, this work proposes a specific methodology to characterize the electromagnetic properties of the CP rotor material as a function of the temperature in order to better predict the machine electrical performances, especially regarding the iron losses. http://hdl.handle.net/10985/20122 Magnetic ageing investigation of bulk low-carbon silicon steel TOTO JAMIL, Meryeme; BENABOU, Abdelkader; CLENET, Stephane; SHIHAB, Sylvain; LE BELLU ARBENZ, Laure; MIPO, Jean-Claude In this paper, the magnetic ageing of a bulk forged non-annealed magnetic core, used in claw pole synchronous machine, is investigated. The study is carried out by characterizing the material properties of two groups of samples subjected to a thermal ageing at 180 °C that corresponds to the maximum operating temperature of the claw pole rotor. The investigated characteristics are the electrical conductivity, the magnetic properties, the material microstructure and the Vickers hardness. They were characterized along with the ageing time. The results show that, during the thermal ageing, the hysteresis losses and the Vickers hardness have been affected by the magnetic ageing, whereas the electric conductivity and the normal B-H curve have not been modified. The microstructure analyses showed that carbides precipitates were the main cause behind the magnetic ageing. Moreover, the comparison between the results of two groups of samples revealed the possibility that the magnetic ageing of the material could have started during the manufacturing process of the magnetic core. Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/10985/20122 2021-01-01T00:00:00Z TOTO JAMIL, Meryeme BENABOU, Abdelkader CLENET, Stephane SHIHAB, Sylvain LE BELLU ARBENZ, Laure MIPO, Jean-Claude In this paper, the magnetic ageing of a bulk forged non-annealed magnetic core, used in claw pole synchronous machine, is investigated. The study is carried out by characterizing the material properties of two groups of samples subjected to a thermal ageing at 180 °C that corresponds to the maximum operating temperature of the claw pole rotor. The investigated characteristics are the electrical conductivity, the magnetic properties, the material microstructure and the Vickers hardness. They were characterized along with the ageing time. The results show that, during the thermal ageing, the hysteresis losses and the Vickers hardness have been affected by the magnetic ageing, whereas the electric conductivity and the normal B-H curve have not been modified. The microstructure analyses showed that carbides precipitates were the main cause behind the magnetic ageing. Moreover, the comparison between the results of two groups of samples revealed the possibility that the magnetic ageing of the material could have started during the manufacturing process of the magnetic core.