Comparison of Electromagnetic Performance of 10-MW HTS Double-Stator Flux Modulation Wind Generators With Different Topologies

Purpose – In this paper, the partitioned stator flux reversal permanent magnet (PM) (PS-FRPM) machines with Halbach array PMs are investigated to compare with the machine having the conventional parallel magnetized PMs, and conventional FRPM machine. This paper aims to discuss these issues. Design/methodology/approach – The Halbach array PM machines with 2-, 3-, and 4-segment and ideal Halbach array PMs have similar topology and designed based on the PS-FRPM with parallel magnetized PMs. The open circuit analysis and electromagnetic performance has been calculated and compares with the aid of finite element (FE) method, and validated by experiments. Findings – The PS-FRPMs with Halbach array PMs have higher back-EMF and torque performance, as well as lower cogging torque and torque ripple, all having significantly higher torque density than the FRPM machine with single stator. The experimental results and FE predicted results of the 2-segment Halbach PM prototype machine are compared and good agreement is achieved. Originality/value – This paper introduces the new concept and design of PS-FRPMs having Halbach array PMs with different PM segments and idea PM array. The comparison with conventional FRPM and PS-FRPM with parallel magnetized PMs shows the benefits with PS-FRPMs with Halbach array PMs.

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Design and analysis of a new partitioned stator flux-modulation motor for direct drive applications

IET Electric Power Applications ◽

10.1049/iet-epa.2019.0593 ◽

2020 ◽

Vol 14 (2) ◽

pp. 184-191

Author(s):

Xuhui Zhu ◽

Wenxiang Zhao ◽

Liang Xu ◽

Jinghua Ji

Keyword(s):

Direct Drive ◽

Flux Modulation ◽

Stator Flux

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Comparative study of partitioned stator flux-modulation motors with different permanent magnet arrays

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-201563 ◽

2021 ◽

pp. 1-19

Author(s):

Chen Jia ◽

Liang Xu ◽

Jinghua Ji ◽

Wenxiang Zhao

Keyword(s):

Performance Comparison ◽

Electromagnetic Torque ◽

Array Type ◽

Halbach Array ◽

Modulation Techniques ◽

Flux Modulation ◽

Different Types ◽

Pole Type ◽

Stator Flux ◽

Consequent Pole

By incorporating the merits of partitioned stator and flux modulation techniques, the partitioned stator flux modulation motors featuring high torque, have attracted much attention. This paper investigates four partitioned stator flux modulation motors with different types of PM arrays, including surface-mounted type, consequent-pole type, Halbach-array type, and half-Halbach type. The influences of key parameters on the average electromagnetic torque is conducted and compared. Then, based on the optimal designs, four motors are compared in terms of magnetic field distribution, back-electromotive force, torque characteristics, loss and overload ability. The result reveals that the half-Halbach motor is capable of utilizing more PM to improve electromagnetic torque. Also, the consequent-pole motor achieves the highest torque per PM usage. In addition, performance comparison under the same PM usage is carried out. The result shows that the half-Halbach motor not only exhibits the highest average torque but also achieves the highest PM utilization. Last, the prototype of half-Halbach motor is built for experimental verification.

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Design optimization and comparative analysis of dual-stator flux modulation machines

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society ◽

10.1109/iecon.2017.8216632 ◽

2017 ◽

Author(s):

Qingsong Wang ◽

Shuangxia Niu

Keyword(s):

Comparative Analysis ◽

Design Optimization ◽

Flux Modulation ◽

Stator Flux

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Improved Rotor Braking Protection Circuit and Self-Adaptive Control for DFIG during Grid Fault

Energies ◽

10.3390/en12101994 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1994 ◽

Cited By ~ 2

Author(s):

Jiming Chen ◽

Yuanhao Wang ◽

Mingxiao Zhu ◽

Qianyu Yu ◽

Jiacai Li

Keyword(s):

Adaptive Control ◽

Control Strategy ◽

Low Voltage ◽

Wind Generators ◽

Protection Circuit ◽

Adaptive Control Strategy ◽

Stator Flux ◽

Doubly Fed ◽

Rotor Side Converter ◽

Self Adaptive

This paper introduces an improved rotor braking protection circuit configuration and the corresponding self-adaptive control strategy to enhance the low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG). The proposed protection circuit consists of a crowbar circuit and a series rotor braking resistor array, which guarantees the safe operation of wind generators under the LVRT. Moreover, to adapt the proposed protection and further enhance the performance of the improved configuration, a corresponding self-adaptive control strategy is presented, which regulates the rotor braking resistor and protection exiting time automatically through calculating the rotor current in the fault period. The LVRT capability and transient performance of the DFIG by using the proposed method is tested with simulation. Compared with the conventional crowbar protection or the fixed rotor braking protection, the proposed protection and the control strategy present several advantages, such as retaining the control of the rotor side converter, avoiding repeated operation of the protection and accelerating the damping of stator flux linkage during a grid fault.

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