High-Speed Electrical Machine with Active Magnetic Bearing System Optimization

Смирнов, А. В.; Uzhegov, Nikita; Sillanpää, Teemu; Pyrhönen, Juha; Pyrhönen, Olli

doi:10.1109/tie.2017.2716875

Cited by 80 publications

(22 citation statements)

References 25 publications

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“…From the design point of view, HSPMMs have various challenges that need to be addressed, including power loss, temperature field, rotor thermal stress, and rotor dynamics, which are also the key factors in the design of HSPMMs [3]. Because of the low tensile strength and operating temperature of permanent magnets (PMs), the ultimate output power of HSPMMs is mostly subject to the mechanical and thermal constraints of the PMs [4], [5]. To ensure the reliability of high-speed rotor operation, the high strength, low density carbon fiber sleeve (CFS) is usually adopted to protect the PMs.…”

Section: Introductionmentioning

confidence: 99%

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

2020

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For high-speed permanent magnet machines (HSPMMs), the precise analysis of rotor stress and rotor dynamics is essential to ensure the stable operation of rotor under high-speed conditions. This work conducts an in-depth research on the rotor of an HSPMM for a micro gas turbine with predetermined geometrical sizes. Firstly, the mechanical and electromagnetic losses are investigated by both, empirical methods and finite element method (FEM) respectively, and then the 3D steady-state temperature distribution of the HSPMM is evaluated on this basis. Then, considering the non-isothermal temperature field of the rotor, the 3D thermal-structural coupling method is adopted to analyze the influence of the carbon fiber wrapping direction and the epoxy resin adhesive between permanent magnets (PMs) and rotor core on the rotor thermal stress. Furthermore, in the steady-state thermal field, considering the change in elastic modulus and the generation of thermal stress caused by temperature rise, the results of the modal analysis are compared with those of room temperature to analyze the effect of temperature on the natural frequency of the rotor. Finally, two prototypes of 80 kW, 60000 rpm HSPMMs are fabricated to test the capability of the HSPMM. The experimental results of back-to-back drag test and modal test verify the accuracy of the temperature characteristics and modal analysis, respectively.INDEX TERMS Coupling analysis, high-speed permanent magnet machines, rotor dynamics, thermal stress.

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Section: Introductionmentioning

confidence: 99%

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

2020

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“…The multiobjective genetic algorithm (GA) was synthesized for the AMB design method by Smirnov et al to reduce the magnetic influence on the high-speed electrical machine performance. (4) A hybrid magnetic bearing (HMB) design to decrease the AMB power consumption in which PMs were used to increase the radial stability of the rotor, was reported. (5) Since the AMB operation is highly nonlinear and time varying with external interference, a nonlinear adaptive sliding-mode controller was designed to control the position of the rotor.…”

Section: Introductionmentioning

confidence: 99%

Multi-hybrid Active Magnetic Bearing Design for Milling Spindle Applications

Lee¹,

Wu²,

Wang³

et al. 2020

Sensors and Materials

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Active magnetic bearings (AMBs) have been gradually developed and used in industrial applications. For a milling spindle system with full magnetic support, at least one axial AMB and two radial AMBs should be included. As a result, the milling spindle dimensions will probably be too large for the application of machine tools. A multi-hybrid AMB design, in which one axial AMB, one radial AMB, and a permanent magnet (PM) are combined, is reported in this work. The PM is embedded for axial suspension for the rotor weight so that the force requirement and the dimensions of the axial AMB can be reduced. On the other hand, magnetic channels were specially designed to couple the three magnetic loops generated by the AMBs and PM instead of isolating these magnetic fluxes individually. The proposed design is also suitable for applications of robot arm joints, such as waist and shoulder joints, to improve the bearing lifetime under heavy loads and to actively regulate the joint position deviation. The proposed multi-hybrid AMB design was practically manufactured after intensive analyses and verified by practical tests.

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“…High-speed induction machines (IMs) equipped with a solid steel rotor have the advantage of running at a much higher rotational speed than other types of electrical machines, which are also frequently used in high-speed applications, such as permanent magnet synchronous machines (PMSMs) and switched reluctance machines (SRMs) [1]- [4]. It has been reported in [5] that the maximum rotor peripheral speeds that have been achieved in recent years for IMs (a solid rotor coated with a copper layer), PMSMs (rotor surface-mounted permanent magnets with a titanium sleeve), and SRMs…”

Section: Introductionmentioning

confidence: 99%

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Petrov

Pyrhönen

2019

IEEE Access

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High-speed induction machines equipped with a solid steel rotor are capable of achieving a high-rotating speed than other types of machines, because of their simpler and more robust rotor structure. At the same time, however, the eddy-current losses in the solid rotor may be critical, because of the high conductivity of the rotor material, which makes it easy for axial eddy currents to travel in the solid rotor. To efficiently mitigate the rotor eddy-current losses, it is important to accurately determine the rotor eddycurrent losses induced by a particular harmonic in advance. In this paper, an improved virtual permanent magnet harmonic machine (VPMHM) model equipped with a sinusoidally magnetized virtual magnet based on the finite element method (FEM) is proposed for determination of the rotor eddy-current harmonic losses. The 2-D fast Fourier transform was used to accurately analyze the time-spatial air-gap flux density harmonics. The VPMHM model was enhanced to ensure that it was able to exactly produce the required flux density harmonics in the air gap. Two algorithms for the improved VPMHM models with different hybrid excitations were proposed to determine the harmonic losses together with the other important harmonic behavior. The model was further investigated to separate the electromagnetic transients from different harmonics. Finally, the simulation time for the harmonic losses required by the enhanced VPMHM model was significantly reduced by separating the harmonic transients. All the results and conclusions presented in this paper are based on the FEM analysis. INDEX TERMS Solid-rotor high-speed induction machine (IM), finite element method (FEM), 2-D fast Fourier transform, eddy-current losses, improved virtual permanent magnet harmonic machine (VPMHM).

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High-Speed Electrical Machine with Active Magnetic Bearing System Optimization

Cited by 80 publications

References 25 publications

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

Rotor Stress and Dynamics Analysis of a High-Speed Permanent Magnet Machine for a Micro Gas Turbine Considering Multiphysics Factors

Multi-hybrid Active Magnetic Bearing Design for Milling Spindle Applications

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

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