Proceedings ArticleDOI
Comparative Evaluation of Overload Capability and Rated Power Efficiency of 200V Si/GaN 7-Level FC 3-Φ Variable Speed Drive Inverter Systems
Gwendolin Rohner,Spasoje Miric,Dominik Bortis,Johann W. Kolar,Mario Schweizer +4 more
- pp 2177-2186
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TLDR
In this paper, a transient thermal model of optimized cooling approaches for 200V GaN and Si packages is empirically deduced and the model is then used to design a 7-Level Flying Capacitor inverter (7L FCi) aiming for 99% efficiency at nominal load for facilitated motor integration and 3 times overload capability.Abstract:
Variable speed drive systems in e.g. robotics applications are challenged with discontinuous operation cycles and short-time overload current requirements of 2-3 times nominal load. As the motor itself constitutes a large thermal time constant compared to the semiconductor devices in the inverter, latter create a bottleneck for the increased losses during overload operation. Hence, special focus has to be laid on the inverter overload capability, preferably without overdimensioning the system. In this paper a transient thermal model of optimized cooling approaches for 200V GaN and Si packages is empirically deduced. The model is then used to design a 7-Level Flying Capacitor inverter (7L FCi) aiming for 99% efficiency at nominal load for facilitated motor integration and 3 times overload capability. Consequently, the number of parallel switches, switching frequencies and the volume of passive components such as the flying capacitors and the output filter inductor is considered. In order to omit oversizing the inverter and the output inductor for overload operation, an unorthodox way of increasing the switching frequency during overload is proposed. It is concluded, that the small chip size of the 200V GaN devices compared the 200V Si devices poses additional challenges when dealing with overload operation.read more
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Journal ArticleDOI
Novel Motor-Kinetic-Energy-Based Power Pulsation Buffer Concept for Single-Phase-Input Electrolytic-Capacitor-Less Motor-Integrated Inverter System
TL;DR: In this paper , the motor integration of singe-phase-supplied variable speed drive (VSDs) is prevented by the significant volume, short lifetime, and operating temperature limit of the electrolytic capacitors required to buffer the power grid.
References
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Journal ArticleDOI
Effect of PWM inverters on AC motor bearing currents and shaft voltages
TL;DR: In this article, the authors investigated AC induction motor shaft voltage problems, current flow through motor bearings and electric discharge current problems within bearings when operated under both pure sinewave and pulse width modulated (PWM) inverter sources.
Journal ArticleDOI
EMI emissions of modern PWM AC drives
TL;DR: In this paper, the authors provide a common understanding of the EMI issues and provide simple pre-installation and post installation guidelines useful for all interested parries involved in the industry application of adjustable speed PWM invertor-fed AC motor drives.
Journal ArticleDOI
Electrical stress and failure mechanism of the winding insulation in PWM-inverter-fed low-voltage induction motors
TL;DR: The winding insulation of low-voltage induction motors in adjustable-speed drive systems with voltage-fed inverters is substantially more stressed than in line-powered motors.
Journal ArticleDOI
Bearing currents and their relationship to PWM drives
TL;DR: In this article, the authors examined AC motor shaft voltages and the resulting bearing currents when operated under pulse width modulation (PWM) voltage source inverters under the theory of electric discharge machining (EDM), including component calculations of the system elements.
Journal ArticleDOI
A 2-kW Single-Phase Seven-Level Flying Capacitor Multilevel Inverter With an Active Energy Buffer
Yutian Lei,Christopher Barth,Shibin Qin,Wen-Chuen Liu,Intae Moon,Andrew Stillwell,Derek Chou,Thomas Foulkes,Zichao Ye,Zitao Liao,Robert C. N. Pilawa-Podgurski +10 more
TL;DR: In this article, the authors present a 2-kW, 60-Hz, 450-V -to-240-V power inverter, designed and tested subject to the specifications of the Google/IEEE Little Box Challenge, which achieves a high power density of 216 W/in $3$ and a peak overall efficiency of 97.6%, while meeting the constraints including input current ripple, load transient, thermal, and FCC Class B EMC specifications.
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