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492 results on '"Fu, W. N."'

6. Quantitive Harmonic Analysis and Force Ripple Suppression of a Parallel Complementary Modular Linear Reluctance Machine

Author

Li, Zhenghao, Niu, Shuangxia, Zhao, Xing, and Fu, W. N.

Abstract

Considering the fluctuating price of permanent magnet, magnetless machine is a new trend in development. Variable reluctance linear machines (VRLM) with simple structure, good robustness, and high dynamic performance, is one of the potential candidates for linear direct-drive wave energy conversion (WEC) application replacing PM-excited linear machine. To ameliorate the fault-tolerance performance of VRLM, the researchers have come up with modular or segmented design, denoted as modular variable reluctance linear machines (MVRLM) However, suffering from large thrust ripple, the design of MVRLM still needs to be improved. To relieve the force ripple of MVRLM, a novel H-shaped modular variable-flux linear reluctance machine (HMVF-LRM) is proposed in this paper. The principle of force ripple suppression by using parallel-complementary structure is analyzed deeply. In this paper, the analytical calculation of induced voltage is developed quantitively with equivalent magnetic circuit method (EMC) and harmonics analysis. Then the design mechanism of HMVF-LRM is illustrated. Further, the performance and fault-tolerant capability of the proposed machine are simulated and evaluated by finite element analysis (FEA), and the prototype is tested to verify the effectiveness of the machine design.

Published
2023
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21. A feasibility study on a new brushless and gearless contra-rotating permanent magnet wind power generator.

Author

Shuangxia Niu, Ho, S. L., Fu, W. N., Chau, K. T., and Lin, F.

Subjects
WIND power plants, ELECTRIC generators, MAGNETIC fields, RENEWABLE energy sources, FINITE element method
Abstract

In this paper, a novel fully integrated contra-rotating permanent magnet (PM) generator is proposed. In order to efficiently capture wind energy, two contra-rotating rotors are integrated, based on magnetic field modulating principle, into a single PM machine. A relatively high angular velocity is created and the torque density is improved. The steady-state and transient performance of the machine is simulated using time-stepping finite-element method. The computation results are used to showcase the validity of the proposed machine design. [ABSTRACT FROM AUTHOR]

Published
2014
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22. Analysis of Indirect Temperature-Rise Tests of Induction Machines Using Time Stepping Finite Element Method

Author

Ho, S. L. and Fu, W. N.

Subjects
Loaders (Machines) -- Evaluation, Induction electric motors -- Evaluation, Finite element method -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

To be able to test the temperature-rise of induction motors with indirect loading is very useful for the motor industry. In this paper different indirect loading schemes including two-frequency methods, phantom loading methods and inverter driven methods, are surveyed. Their merits and demerits are highlighted. A universal method for analyzing all these indirect temperature-rise methods is presented. The analysis is based on the time stepping finite element model of skewed rotor bar induction machines and the solution can include the effects of saturation, eddy-current and the highorder harmonic fields directly. The computed losses can also include the stray losses due to the high-order harmonic fields. An 11 kW induction motor, when operating with normal full-load and on phantom loading, has been used to verify the computed results. Index Terms--Finite element method, induction machine, losses, temperature-rise test.

Published
2001

23. Inclusion of Interbar Currents in a Network-Field Coupled Time-Stepping Finite-Element Model of Skewed-Rotor Induction Motors

Author

Ho, S. L., Li, H. L., and Fu, W. N.

Subjects
Inductors -- Design and construction, Motors -- Design and construction, Rotors -- Dynamics, Business, Electronics, Electronics and electrical industries
Abstract

In order to include the interbar currents of skewed-rotor inductor motors in finite-element analysis, a three-dimensional (3-D) model is usually necessary. In this paper a two-dimensional multislice time-stepping finite element method of skewed-rotor induction motors is presented to solve such complicated 3-D problems. It is shown that the network of the rotor cage is coupled to finite-element equations so that the interbar currents in the rotor can be taken into account. By arranging the unknowns and mesh-current equations ingeniously, the resultant coefficient matrix of the global system equations are made symmetrical. Compared with 3-D finite-element methods, the computation time for solving field equations with the proposed method is significantly shorter. The model can be used to estimate the high-order harmonic stray losses in induction motors. A comparison between computed and tested results is also given. Index Terms--Finite element methods, induction motors.

Published
1999

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