Thermal 3D Modeling and Analysis of PMSMs with Inter-Turn Faults

Hoffmann, Felix; Foitzik, Simon; Doppelbauer, Martin

doi:10.1109/iemdc47953.2021.9449573

Cited by 3 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value primarily depends on the machine geometry and the fault location. The thermal 3D lumped‐parameter model presented in [18] is used to calculated

β_{F}

. The model consists of 720 bodies and can take the generated heat of an inter‐turn fault at any location within the stator winding into account.…”

Section: Machine Analysismentioning

confidence: 99%

Fault tolerant control of a three‐phase PMSM by limiting the heat of an inter‐turn fault

Foitzik

Doppelbauer

2021

IET Electric Power Appl

Self Cite

View full text Add to dashboard Cite

Inter-turn faults are most commonly the initial stator winding fault in power trains with Voltage Source Inverters. Without counteractions, these faults can propagate and cause catastrophic failures in safety critical applications like all-electric aircraft. The propagation of an inter-turn fault can be reduced, by limiting the local temperature at the fault. In this article, a fault tolerant control scheme is designed and validated, which reduces the heat of an inter-turn fault by a controlled adaption of the operating point. The control strategy utilizes the hyperbolas of constant torque and the controller design is based on a linear time-invariant system description. A machine learning regression is used for the online heat estimation and a 3D lumped-parameter model to evaluate the thermal effectiveness. To test the control scheme, an inter-turn fault is actively switched, which generates the local heat equal to 13% of the overall stator copper losses. The control scheme adopts the operating point within 30 electric periods, which reduces the generated heat of the interturn fault by 70%. This causes a temperature reduction at the fault locally from 367°C to 175°C, which extends the approximated insulation life from 30 s to 5000 h.

show abstract

“…This value primarily depends on the machine geometry and the fault location. The thermal 3D lumped‐parameter model presented in [18] is used to calculated

β_{F}

. The model consists of 720 bodies and can take the generated heat of an inter‐turn fault at any location within the stator winding into account.…”

Section: Machine Analysismentioning

confidence: 99%

Fault tolerant control of a three‐phase PMSM by limiting the heat of an inter‐turn fault

Foitzik

Doppelbauer

2021

IET Electric Power Appl

Self Cite

View full text Add to dashboard Cite

show abstract

“…New modeling approaches for specific components were developed, e.g., to characterize ball bearings utilized for electric machines [11]. Some authors further consider the thermal characteristics of electric machines in the presence of particular faults, like winding specific flaws [12], [13]. The winding generally is the focus of the work of many authors.…”

Section: Introductionmentioning

confidence: 99%

Measurement-Based Identification of Lumped Parameter Thermal Networks for sub-Kw Outer Rotor PM Machines

Wöckinger

Bramerdorfer

Drexler

et al. 2023

IEEE Trans. on Ind. Applicat.

View full text Add to dashboard Cite

This work is on deriving precise lumped parameter thermal networks for modeling the transient thermal characteristics of electric machines under variable load conditions. The goal is to facilitate an accurate estimation of the temperatures of critical machines' components and to allow for running the derived model in real time to adapt the motor control based on the load history and maximum permissible temperatures. Consequently, the machine's capabilities can be exhausted at best considering a highly-utilized drive. The model shall be as simple as possible without sacrificing the exactness of the predicted temperatures. Accordingly, a specific lumped parameter thermal network topology was selected and its characteristics are explained in detail. The measurement data based optimization of its critical parameters through an evolutionary optimization strategy, and the therefore utilized experimental setup will be described in detail here. Measurement cycles were recorded for modeling and verification purposes including both static and dynamic test cycles with changing load torque and speed requirements. Applying the proposed hybrid approach for determining the model's parameters through involving physics-based equations as well as numerical optimization followed a significant improvement of the preciseness of the predicted motor temperatures compared to solely determining the networks's coefficients based on expert knowledge. Thereby, the validation included both the original measurement data as well as extra measurement runs. The proposed and applied strategy provides an excellent basis for future thermal modeling of electric machines.

show abstract

Lumped-Parameters Thermal Network of PM Synchronous Machines for Automotive Brake-by-Wire Systems

Graffeo

Vaschetto

Miotto³

et al. 2021

Energies

View full text Add to dashboard Cite

Thermal analysis represents a key factor in electrical machine design due to the impact of temperature increase on insulation lifetime. In this context, there has been a wide investigation on thermal modeling, particularly for machines used in harsh working conditions. In this perspective, brake-by-wire (BBW) systems represent one of the most challenging applications for electrical machines used for automotive smart actuators. Indeed, electro-actuated braking systems are required to repeatedly operate the electric machine in high overload conditions in order to limit the actuator response time, as well as to enhance gravimetric and volumetric specific performance indexes. Moreover, BBW systems often impose unconventional supply conditions to the electric machine, consisting of dc currents in three-phase windings to keep the rotor fixed during the braking intervals. However, a dc supply leads to uneven temperature distributions in the machine, and simplified thermal models may not accurately represent the temperature variations for the different machine parts. Considering such unconventional supply conditions, this paper initially investigates the applicability of a conventional lumped-parameters thermal network (LPTN) based on symmetry assumptions for the heat paths and suitable for surface-mounted PM synchronous machines used in BBW systems. An extensive test campaign consisting of pulses and load cycle tests representative of the real machine operations was conducted on a prototype equipped with several temperature sensors. The comparison between measurements and predicted average temperatures, together with insights on the unbalanced heat distribution under the dc supply obtained by means of finite element analyses (FEA), paved the way for the proposal of a phase-split LPTN with optimized parameters. The paper also includes a critical analysis of the optimized parameters, proposing a simplified, phase-split lumped-parameters thermal model suitable to predict the temperature variations in the different machine parts for PM synchronous electric machines used in BBW systems.

show abstract

Thermal 3D Modeling and Analysis of PMSMs with Inter-Turn Faults

Cited by 3 publications

References 14 publications

Fault tolerant control of a three‐phase PMSM by limiting the heat of an inter‐turn fault

Fault tolerant control of a three‐phase PMSM by limiting the heat of an inter‐turn fault

Measurement-Based Identification of Lumped Parameter Thermal Networks for sub-Kw Outer Rotor PM Machines

Lumped-Parameters Thermal Network of PM Synchronous Machines for Automotive Brake-by-Wire Systems

Contact Info

Product

Resources

About