flux weakening
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Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7464
Author(s):  
Hyun-Jae Lee ◽  
Jin-Geun Shon

This paper presents an improved voltage flux-weakening strategy of a permanent magnet synchronous motor (PMSM) in a high-speed operation. The speed control performance using voltage flux-weakening control is not affected by the motor parameters, so it is used in various motors for high-speed operations. In general, the voltage flux-weakening control uses voltage references to generate a flux axis current reference. However, there may be errors between the voltage reference and the actual voltage flowing into the motor. This causes an error in the current reference generation and reduces the efficiency of the inverter and motor due to the use of more current. In this paper, the problems that can occur due to voltage errors were analyzed through theoretical approaches and simulations, and improved voltage flux-weakening control to resolve these problems was presented. This method’s advantage is that the error between the voltage reference and the voltage applied to the motor can be minimized, and the target speed can be reached with minimum current. As a result, it was possible to increase the energy efficiency by reducing the amount of current flowing through the motor. The effect of the improved voltage-based flux-weakening control method was verified through simulations and experiments. As a result, the voltage errors were reduced by approximately 2.16% compared to the general method. Moreover, the current used in the field-weakening control region was reduced by up to 27.17% under the same torque condition.


Author(s):  
Zhaoyuan Zhang ◽  
Chaohui Zhao ◽  
Lisi Tan ◽  
Yao Chen
Keyword(s):  

Author(s):  
Huiseong Lim ◽  
Wooram Lee ◽  
Kwanyoung Lee ◽  
Dongyoung Shin ◽  
Hoyoung Kim ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6849
Author(s):  
Tayfun Gundogdu ◽  
Zi-Qiang Zhu ◽  
Jean-Claude Mipo

This paper presents a detailed analysis and design guidelines for advanced nonoverlapping winding induction machines (AIMs) with coil-pitch of two slot-pitches by considering some vital empirical rules and flux-weakening characteristics. The aim of the study is to develop a type of new winding and stator topology for induction machines (IMs) that will lead to a decrease in total axial length without sacrificing torque, power, and efficiency. The key performance characteristics of the improved AIMs are investigated by 2D time-stepping finite element analysis (FEA) and compared with those of IMs having fractional and conventional overlapping and nonoverlapping windings. Compared with the conventional overlapping winding counterpart of the AIM, a ~25% shorter axial length without sacrificing torque, output power, and efficiency is achieved. In addition, the influences of major design parameters, such as stator slot, rotor slot and pole numbers, stack length, number of turns per phase, machine geometric parameters, etc., on the flux-weakening characteristics are investigated. It has been concluded that the major design parameters have a considerable effect on the electromagnetic performance. However, among those parameters, the influences of pole number and stack length together with the number of turns on flux-weakening characteristics are significant.


2021 ◽  
Author(s):  
Wesam Taha ◽  
Diego F. Valencia ◽  
Zisui Zhang ◽  
Babak Nahid-Mobarakeh ◽  
Ali Emadi

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