Relationship between the induced voltage of a rotor bar and the rotation characteristics of a high-temperature superconducting induction motor

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-09-03 DOI:10.1063/5.0219918
T. Nakamura, Y. Ogama
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Abstract

Although high-temperature superconducting induction motors have a simple structure, they are distinguished by their high efficiency and high power density. However, an accurate theoretical model that defines the primary electrical characteristics controlling the motor has not been established because of the nonlinear characteristics of high-temperature superconducting squirrel-cage rotor winding. As part of establishing such a model, an experiment was conducted to analyze the relationship between the induced voltage of the rotor bar in a high-temperature superconducting squirrel-cage rotor winding and stator-side quantities (voltage and transport current), as well as its rotation characteristics. A subject was a 1.5 kW class induction motor using Bi–Sr–Ca–Cu–O high-temperature superconducting rotor bars and the experiment was performed at a temperature and a frequency of 77 K and 60 Hz, respectively. The induced voltages of the rotor bars were measured by applying a rotating magnetic field and exhibited a distorted waveform characterized by a third-order harmonic in a magnetic flux flow state. Despite the distorted voltage waveform of the rotor bar, the stator transport current responsible for driving the induction motor remained unaffected and the motor initiated rotation in a slip rotation mode. From the above results, it was experimentally clarified that a stator voltage exceeding the critical current of the rotor bar must be applied when starting the induction motor. It was also shown that the rotor bar can be regarded as a constant resistance for a constant effective value of the stator current when transitioning the motor into a slip rotation state.
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转子棒感应电压与高温超导感应电动机旋转特性之间的关系
高温超导感应电机虽然结构简单,但却具有高效率和高功率密度的特点。然而,由于高温超导鼠笼式转子绕组的非线性特性,目前还没有建立一个精确的理论模型来定义控制电机的主要电气特性。为了建立这样一个模型,我们进行了一项实验,分析高温超导鼠笼式转子绕组中转子杆的感应电压与定子侧数量(电压和传输电流)之间的关系,以及其旋转特性。实验对象是一台使用 Bi-Sr-Ca-Cu-O 高温超导转子棒的 1.5 千瓦级感应电机,实验温度和频率分别为 77 K 和 60 Hz。转子棒的感应电压是通过施加旋转磁场测量的,在磁通流状态下呈现出以三阶谐波为特征的畸变波形。尽管转子磁栅的电压波形发生了畸变,但负责驱动感应电机的定子传输电流仍未受到影响,电机以滑移旋转模式启动旋转。根据上述结果,实验证明,在启动感应电机时,必须施加超过转子线棒临界电流的定子电压。实验还表明,当电机过渡到滑差旋转状态时,转子杆可被视为定子电流有效值恒定的恒定电阻。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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