Influence of Insulation Thermal Aging on the Temperature Assessment in Electrical Machines

Madonna, Vincenzo; Giangrande, Paolo; Galea, Michael

doi:10.1109/tec.2020.3001053

Cited by 16 publications

(7 citation statements)

References 43 publications

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“…Fast analysis of the thermal behaviour of the machine becomes possible with this method. The impact of insulation aging on the thermal performance of electrical machines has been investigated in [6], where an extended version of LPTNs with the ability to incorporate thermal variations related to insulation aging has been proposed.…”

Section: Lumped Parameter Thermal Networkmentioning

confidence: 99%

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An overview of thermal modelling techniques for permanent magnet machines

Khalesidoost

Faiz

Mazaheri‐Tehrani

2022

IET Science Measure & Tech

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Permanent magnet (PM) machines have gained increasing attention from the industry because of their potential merits over conventional electrical machines. High‐temperature level in electrical machines is a major factor that can adversely impact the performance and health conditions of these machines. These effects need to be minimized to make them competitive with currently operational machines in the industry. It can be done by performing a thorough thermal analysis of the prototype during the design process and proper online thermal monitoring of the machine during the operation stage. Thermal modelling is a powerful tool for achieving such goals in both cases. This paper aims to review the state‐of‐the‐art of thermal modelling techniques and provide a detailed comparison of them in PM machines. The fundamental concepts of heat transfer and sources of heat in PM machines are first discussed. Then, different thermal modelling techniques, including thermal subdomain models (TSMs), lumped parameter thermal networks (LPTNs), finite element models (FEMs), computational fluid dynamics (CFD), reduced order models (ROMs), and hybrid thermal models (HTMs) are introduced and compared. Finally, the utilization of these models in the thermal design, control, and monitoring of PM machines is studied.

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Section: Lumped Parameter Thermal Networkmentioning

confidence: 99%

“…There are different models to estimate the life‐span of electrical machine according to the temperature of operation like the models presented in [3] and [4, 5]. When an insulation is subjected to over‐temperature, some chemical reactions occur in material and generally the dielectric material will be weakened [6].…”

Section: Introductionmentioning

confidence: 99%

An overview of thermal modelling techniques for permanent magnet machines

Khalesidoost

Faiz

Mazaheri‐Tehrani

2022

IET Science Measure & Tech

View full text Add to dashboard Cite

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“…The primary source of thermal stress on the stator coils is due to copper losses caused by I 2 R (i.e., DC resistive loss and AC proximity loss). This accelerates chemical reactions within the insulation, gradually causing the deterioration of the dielectric properties of the insulating material [12]. The thermal index of the wire insulation typically represents the maximum operating temperature that an electrical machine can withstand.…”

Section: Introductionmentioning

confidence: 99%

Life Characterization of PEEK and Nanofilled Enamel Insulated Wires Under Thermal Ageing

Khowja,

Vakil,

Ahmad

et al. 2024

IEEE Access

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This paper characterizes and develops life models for two different wire insulating materials: Poly-ether-ketone and nanofilled enamel (Allotherm wire). The article focuses on predicting the lifespan of PEEK and Allotherm wire insulation materials, targeting low voltage electrical machines. The study investigates the effects of thermal ageing on factors such as dissipation factor, insulation capacitance, and partial discharge inception voltage (PDIV). Delamination of the insulation coating is observed in both wires during the ageing process, resulting in an increase in the differential dissipation factor and insulation capacitance. With respect to its unaged condition, Allotherm wire exhibits faster degradation, showing 2.4and 4.5-times higher changes in the differential dissipation factor and insulation capacitance respectively compared to PEEK wire after the 16 th ageing cycle. In addition, Allotherm wire experiences faster deterioration of the PDIV, with a 42% reduction compared to 32% in PEEK after the same ageing cycle. Using a single-stress Arrhenius life model, the study estimates the relative thermal index (RTI) for both materials as 245°C for PEEK and 226.25°C for Allotherm wire. These results indicate a 72.1% decrease in the lifetime of PEEK and a 25.5% decrease in the lifetime of Allotherm wire when compared to the manufacturer's RTI specification.INDEX TERMS Dissipation factor, insulation capacitance, low voltage electrical machines, partial discharge inception voltage, thermal life, thermal index, thermal ageing, Time-to-Breakdown

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“…During the actual operation of the motor, there will be intermittent sudden changes in the load. At this time, the motor needs to have a high torque overload capacity under the condition of constant speed [2]. However, the increase of the electromagnetic torque requires the drive motor to increase the electrical load.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Test of Impact-Resistant Overload Capability of Companion-Type Direct Cooling Motor

Hou

et al. 2023

IEEE Access

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In the actual working process of the motor, there will be short-term overload conditions, which puts forward higher requirements for maintaining the overload capacity of the motor. Due to the limitation of the thermal limit on the overload capacity of the motor, taking a 250kW permanent magnet synchronous motor (PMSM) as an example, this paper proposes a thermal management scheme of companion-type direct cooling, and establishes a three-dimensional thermal network model considering the secondary circulation factor. At the same time, in order to explore the influence of the thermal management scheme on the overload capacity of the motor when there is an impact load, on the premise that there is a safety margin for the hottest spot temperature of the winding under the rated state of the motor, the impact load is simulated by setting the overload torque, the thermal network model is used to compare and analyze the temperature field of the motor based on the companion-type direct cooling and the indirect casing cooling, and combining with the insulation limit to quantitatively compare the overload capacity of the motor after impact load. Through the simulation test, it is verified that the motor based on the companiontype direct cooling has efficient heat dissipation and stronger impact-resistance overload capability. The proposal of the companion-type direct cooling scheme has important practical significance for excavating the load potential of the motor under actual operating conditions.INDEX TERMS companion-type direct cooling, secondary circulation, high-precision three-dimensional thermal network, impact load, evaluation of overload capacity, simulation test.

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Influence of Insulation Thermal Aging on the Temperature Assessment in Electrical Machines

Cited by 16 publications

References 43 publications

An overview of thermal modelling techniques for permanent magnet machines

An overview of thermal modelling techniques for permanent magnet machines

Life Characterization of PEEK and Nanofilled Enamel Insulated Wires Under Thermal Ageing

Evaluation and Test of Impact-Resistant Overload Capability of Companion-Type Direct Cooling Motor

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