Loss Calculation and Thermal Analysis for High-Speed Permanent Magnet Synchronous Machines

Zhang, Chao; Chen, Lixiang; Wang, Xiao Yu; Tang, Renyuan

doi:10.1109/access.2020.2994754

Cited by 32 publications

(21 citation statements)

References 23 publications

(24 reference statements)

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“…However, in the stator core of the PMSM, the trajectories of the flux density are not only alternating, but also rotational, and with high-order harmonics. Considering the rotational core loss, many researchers decomposed the flux density into its radial and tangential components B r and B t [36][37][38], and modified the core loss calculation models based on the equation below:…”

Section: Core Loss Calculation Methodsmentioning

confidence: 99%

Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss

Gong

Guo

et al. 2022

Energies

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Permanent magnet synchronous motor (PMSM) possesses the advantages of low power loss, high power density and high torque density and, hence, has achieved broad applications in both industrial drives and home appliances. With the increasing demands for high power density, the PMSM often operates at high speed and high frequency, leading to high power loss and temperature rise. Consequently, proper consideration of power loss, including the core loss, has attracted much attention for the modelling, designing, controlling and optimizing of PMSMs. However, the widely used equivalent circuit model, capable of providing good analysis results with fast calculation, often ignores the core loss, which may lead to unsatisfactory motor performance. This paper aims to investigate the development of equivalent circuit models, with predictable core loss for PMSMs, and proposes novel equivalent circuit models, which improve the core loss prediction accuracy in the load conditions. Some thoughts about the further improvement of the models are proposed and discussed.

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Section: Core Loss Calculation Methodsmentioning

confidence: 99%

Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss

Gong

Guo

et al. 2022

Energies

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“…These losses can be calculated for a cylindrical rotor spinning in a coaxial stator using the following equation [31]:

\begin{equation}{P_{air}} = {C_f}\;\pi {\rho _a}{\omega ^3}{r^4}{L_a}\end{equation}

where friction coefficient C f depends on rotor and stator structure. It is noted that (12) is an empirical equation, and therefore, its accuracy is not comparable with numerical methods [32]. Couette Reynolds and Taylor numbers are two dimensionless numbers which affect (12).…”

Section: Heat Transfer Theorymentioning

confidence: 99%

“…where friction coefficient C f depends on rotor and stator structure. It is noted that ( 12) is an empirical equation, and therefore, its accuracy is not comparable with numerical methods [32]. Couette Reynolds and Taylor numbers are two dimensionless numbers which affect (12).…”

Section: Heat Transfer Theorymentioning

confidence: 99%

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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“…However, several challenges occur in the manufacturing of high-speed PM machines due to the replacement of field winding by PM. In advanced high-speed PM machines, a parasitic loss is considered rotor eddy loss, as it only contributes to a small amount of the machine's overall power [5], [6]. Precise calculation of eddy current loss is essential in PM machines for high performance and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Investigation of 3-Slot/2-Pole High Speed Permanent Magnet Machine

Khan

et al. 2021

IEEE Access

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High-speed rotating mechanical machinery is a developed, mature and reliable technology for many engineering applications. In high-speed permanent magnet machines, the rotor's permanent magnet PM is not strong enough to withstand the centrifugal force resulting from excessive rotational speed; thus, the PM material must be protected by a non-magnetic alloy sleeve. This paper presents a novel high-speed PM machine with solid rotor PM covered by a titanium retaining sleeve. The rotor stress condition is simplified as a plane stress problem according to the strength measurement of solid PM rotors in the high-speed PM motors. The analytical formulas for rotor stress are presented based on the polar coordinate displacement method. The proposed model is compared with a conventional model having auxiliary slots in stator teeth. Using a finite element analysis environment, the performance analysis shows that the proposed design has reduced magnet eddy current loss, cogging torque, and iron losses. The initial design is also optimized using a deterministic optimization algorithm that increases output torque by 26% compared to the initial design. INDEX TERMS Airgap flux density, finite element method, high-speed permanent magnet machine, magnet eddy current loss, retaining sleeve, rotor design, stress analysis.

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Loss Calculation and Thermal Analysis for High-Speed Permanent Magnet Synchronous Machines

Cited by 32 publications

References 23 publications

Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss

Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss

An overview of thermal modelling techniques for permanent magnet machines

Design and Performance Investigation of 3-Slot/2-Pole High Speed Permanent Magnet Machine

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