Investigation of rotor strength and rotor dynamics for high‐speed high‐power switched reluctance machines

Gan, Chun; Chen, Yu; Cui, Xianjin; Sun, Jianbo; Ni, Kai; Qu, Ronghai

doi:10.1049/iet-epa.2019.1019

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…An improved torque hysteresis control method is adopted to enhance the efficiency of the SRM. In order to investigate the rotor dynamic characteristics and the mechanical strength of the SRM rotor in high-speed and high-power condition, an investigation scheme has been presented in [25]. The strength of the rotor is verified at 1.2 times the rated speed and the von-Mises yield criterion is used.…”

Section: One-stack Structure Conventional Srmmentioning

confidence: 99%

Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends

et al. 2021

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This paper presents a detailed literature review on switched reluctance motor (SRM) and drive systems in electric vehicle (EV) powertrains. SRMs have received increasing attention for EV applications owing to their reliable structure, fault tolerance ability and magnet free design. The main drawbacks of the SRM are torque ripple, low power density, low power factor and small extended speed range. Recent research shows that multi-stack conventional switched reluctance motors (MSCSRM) and multi-stack switched reluctance motors with a segmental rotor (MSSRM-SR) are promising alternative solutions to reduce torque ripples, increase torque density and increase power factor. Different winding configurations such as single-layer concentrated winding (SLC), single layer mutually coupled winding (SLMC), double layer concentrated winding (DLC), double layer mutually coupled winding (DLMC) and fully-pitched winding (FP) are introduced in the literature in recent years to increase average torque and to decrease torque ripples. This research analyzes winding methods and structure of the SRMs, including conventional and segmental rotors. They have been compared and assessed in detail evaluation of torque ripple reduction, torque/power density increase, noise/vibration characteristics and mechanical structure. In addition, various drive systems are fully addressed for the SRMs, including conventional drives, soft-switching drives, drives with standard inverters and drives with an integrated battery charger. In this paper, the SRM control methods are also reviewed and classified. These control methods include strategies of torque ripple reduction, fault-diagnosis, fault-tolerance techniques and sensorless control. The key contributions of this paper provide a useful basis for detailed analysis of modeling and electromechanical design, drive systems, and control techniques of the SRMs for EV applications.

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Section: One-stack Structure Conventional Srmmentioning

confidence: 99%

Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends

et al. 2021

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“…Gan et al [15] analyzed the critical speed, unbalance response, and stability of the shaft system in detail, and they proposed an investigation scheme of the rotor strength and rotor dynamic characteristics for high-speed and high power switched reluctance machines (SRMs). On the basis of rotor strength constraint, Xu et al [16] presented the composite sheath of a high-speed permanent magnet generator to make the stress distribution reasonable and reduce eddy current loss.…”

Section: Introductionmentioning

confidence: 99%

Influence of Interference Fit and Temperature on High-Speed Permanent Magnet Motor

Zeng,

Yang,

Yang

et al. 2023

Applied Sciences

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A high-speed permanent magnet motor is the core driving component of a centrifugal air compressor. The power of the centrifugal air compressor is output by the motor. Its safety and reliability are embodied in the stability of the rotor structure, which greatly affects the stability and working efficiency of the centrifugal air compressor. Much research has focused on the material strength, structural characteristics, and fit clearance of a high-speed rotor, whereas few research articles have focused on the influence of interference fit of high-speed and ultra-high-speed permanent magnet motors, and there is also little research on the thermal failure caused by temperature in high-speed motors. In this paper, the influence of the interference fit and temperature of the high-speed permanent magnet motor is studied. Using finite element analysis conducted by Ansys to obtain simulation data, the influencing factors of the strength of the interference are analyzed comprehensively in the centrifugal compressor rotor system. The interference value and rotational speed range are determined via numerical calculation. Under the condition of minimum interference, when the calculated speed reaches 137,628.82 rpm, the structure of the rotor is loose and fails, which is a mechanical failure caused by the relative sliding of the magnet and the sheath. The calculated speed value differs from the simulation result by about 1.2%. The simulation results show that the maximum stress of the structure can be reduced from 1186.1 MPa to 308.42 MPa by adding chamfer to the end covers in interference fit structure. The effects of interference value, rotational speed, temperature, and sheath thickness on the structure are also analyzed. From the perspective of temperature on structural reliability, the failure temperature of the structure decreases when the interference value increases. The lowest failure temperature is 182.3 °C when the interference value is 70 μm. After that, the interference value increases and the failure temperature increases. The reason for this is the interaction between radial stress and contact stress. These results are caused by the interaction between interference fit and temperature, which should be paid attention to when the structure of a high-speed permanent magnet motor is designed.

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“…Switched reluctance motor (SRM) has superior performance under special environments such as the starter/generator in all electric/multi-electric aeroengine, vacuum pump, and flywheel energy storage systems, because of its simple structure, low cost, robustness, and suitability for operation in high temperatures [1][2][3]. The SRM generally has a short air gap length in order to effectively produce the rotational reluctance torque, and a considerable magnetic attraction force is also simultaneously generated in radial directions.…”

Section: Introductionmentioning

confidence: 99%

A Full-Period Mathematical Model for a Hybrid-Rotor Bearingless Switched Reluctance Motor

et al. 2021

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A bearingless switched reluctance motor (BSRM) has the combined characteristics of a switched reluctance motor (SRM) and a magnetic bearing. The hybrid-rotor BSRM (HBSRM) discussed in the paper has a twelve-pole stator and an eight-pole hybrid rotor, which is composed of a cylindrical rotor and a salient-pole rotor. Although the asymmetry of the hybrid rotor makes the structure and magnetic field of the HBSRM more complex, it can always produce a significant amount of magnetic pulling force to levitate a rotor shaft at all the rotor angular positions of each phase, which is not available in a traditional BSRM. The classical mathematical model for a conventional BSRM is valid only when its rotor rotates from the start of the overlap position to the aligned position, and the radial force and torque derived from this model are discontinuous at the aligned positon, which is harmful to the motor’s stable operation. In this paper, a full-period mathematical model on the assumption that the gap permeance is cut apart by straight lines or improved elliptical lines for a 12/8-pole HBSRM is provided. On the basis of this mathematical model, the continuity of the radial force and torque at all the rotor angular positions can be guaranteed, and the fine characteristics of this mathematical model have been verified by simulations.

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Investigation of rotor strength and rotor dynamics for high‐speed high‐power switched reluctance machines

Cited by 5 publications

References 33 publications

Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends

Switched Reluctance Motors and Drive Systems for Electric Vehicle Powertrains: State of the Art Analysis and Future Trends

Influence of Interference Fit and Temperature on High-Speed Permanent Magnet Motor

A Full-Period Mathematical Model for a Hybrid-Rotor Bearingless Switched Reluctance Motor

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