Journal ArticleDOI
Computation of load performance and other parameters of extra high speed modified Lundell alternators from 3D-FE magnetic field solutions
R. Wang,Nabeel A. O. Demerdash +1 more
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TLDR
A combined magnetic vector potential, magnetic scalar potential method of computation of 3D magnetic fields by finite elements, in combination with state modeling in the abc frame of reference, is used for global 3-D magnetic field analysis and machine performance computation under rated load and overload condition in an example 14.3 kVA modified Lundell alternator as discussed by the authors.Abstract:
A combined magnetic vector potential, magnetic scalar potential method of computation of 3-D magnetic fields by finite elements, in combination with state modeling in the abc frame of reference, is used for global 3-D magnetic field analysis and machine performance computation under rated load and overload condition in an example 14.3 kVA modified Lundell alternator. The results vividly demonstrate the 3-D nature of the magnetic field in such machines and show how this model can be used as an excellent tool for computation of flux density distributions, armature current and voltage waveform profiles, and harmonic contents, as well as for computation of torque profiles and ripples. Use of the model in gaining insight into locations of regions in the magnetic circuit with heavy degrees of saturation is demonstrated. Experimental results which correlate well with the simulations of the load case are given. >read more
Citations
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Modeling and Parametric Design of Permanent-Magnet AC Machines Using Computationally Efficient Finite-Element Analysis
TL;DR: The CE-FEA method is presented and applied to a parametric design study for an interior-permanent-magnet machine and significant reduction of simulation times is achieved, permitting a comprehensive search of large design spaces for optimization purposes.
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Diagnosis and characterization of effects of broken bars and connectors in squirrel-cage induction motors by a time-stepping coupled finite element-state space modeling approach
TL;DR: In this paper, a time-stepping coupled finite element-state space (FESSA) model was used to diagnose and characterize the effects of rotor (cage) broken bars and connectors in squirrel-cage induction motors.
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A magnetic equivalent circuit based performance computation of a Lundell alternator
TL;DR: In this paper, the magnetic equivalent circuit method (MEC) was used to predict the performance of a claw pole synchronous generator with a very high accuracy and a minimum of computational time.
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Different Faults and Their Diagnosis Techniques in Three-Phase Squirrel-Cage Induction Motors—A Review
TL;DR: A combination of FEM and other methods (such as state-space, which can compensate the above-mentioned drawbacks) can be used as a precise, flexible and widely applicable technique for fault diagnosis of faulty induction motors.
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Calculation of synchronous reactances of small permanent-magnet alternating-current motors: comparison of analytical approach and finite element method with measurements
TL;DR: In this article, the synchronous reactance of permanent magnet (PM) motors has been determined using an analytical method, i.e., form factors of the stator field (armature reaction factors), and experimental tests on a special machine set.
References
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Journal ArticleDOI
Determination of Saturated Values of Rotating Machinery Incremental and Apparent Inductances by an Energy Perturbation Method
TL;DR: In this paper, a method for calculating the apparent and incremental inductance of rotating machinery is presented. But the method is totally general and utilizes numerical field calculation techniques in obtaining stored energy in the magnetic circuits of such machines.
Journal ArticleDOI
Computation of winding inductances of permanent magnet brushless DC motors with damper windings by energy perturbation
TL;DR: In this article, a method for the calculation of motor winding inductances is presented in which damping effects due to metallic retainment sleeves and intentionally introduced damper bar windings are included.
Journal ArticleDOI
A new approach to determine transient generator winding and damper currents in case of internal and external faults and abnormal operation. III. Results
TL;DR: In this paper, a method for analyzing the steady-state and transient currents in the stator, rotor, and damper windings of a large generator is discussed, and the application of the method to five classes of practical importance is described.
Journal ArticleDOI
Extra high speed modified Lundell alternator parameters and open/short-circuit characteristics from global 3-D-FE magnetic field solutions
R. Wang,Nabeel A. O. Demerdash +1 more
TL;DR: A combined magnetic vector potential, magnetic scalar potential method of computation of 3D magnetic fields by finite elements is used for global 3D field analysis and machine performance computations under open-circuit and shortcircuit conditions for an example 14.3 kVA modified Lundell alternator as discussed by the authors.
Journal ArticleDOI
Three dimensional magnetic fields in extra high speed modified Lundell alternators computed by a combined vector-scalar magnetic potential finite element method
TL;DR: In this paper, a 3D finite element (FE) approach was developed and implemented for computation of global magnetic fields in a 14.3 kVA modified Lundell alternator, which makes it practical, using state-of-the-art supercomputer resources, to globally analyze magnetic fields and operating performances of rotating machines which have 3D magnetic flux patterns.
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Determination of Saturated Values of Rotating Machinery Incremental and Apparent Inductances by an Energy Perturbation Method
Extra high speed modified Lundell alternator parameters and open/short-circuit characteristics from global 3-D-FE magnetic field solutions
R. Wang,Nabeel A. O. Demerdash +1 more