Accurate Magnetic Shell Approximations with Magnetostatic Finite Element Formulations by a Subdomain Approach

Hai

Anh

et al. 2021

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This paper presents the harmonic torque reduction by the different rotor pole angles of a three-phase 12/8 switched reluctance motor via an analytical model and simulation method. Improving torque performance by stator and rotor angles was applied for three-phase switched reluctance motor at stator pole/rotor pole ratios of 6/4, 8/12, 18/12, and 24/18. The average torque and the torque ripple effect by stator and rotor pole embrace have been recently studied in many projects. Due to the fact that leakage flux, flux density, and inductance are affected by the stator and rotor pole angles non-linear and linear leakage flux curves occur. Many stator and rotor pole angle combinations for the three-phase switched reluctance motor have already been done via a finite element method. In this paper, turn-on and turn-off angles will be figured based on stator and rotor pole embraces.

Section: Dynamic Simulation and Experimental Resultsmentioning

confidence: 99%

Electromagnetic Torque Analysis of SRM 12/8 by Rotor/Stator Pole Angle

Hai

Anh

et al. 2021

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“…Hence, the displacement current density is negligible. The problem is described by Maxwell's equations [11][12][13][14][15][16]:…”

Section: A Canonical Magnetodynamic Problemmentioning

confidence: 99%

“…Based on the Maxell's equations along with the constitutive relations in (22), the weak form of Ampere' law (22b) is written [5,11,13] as: In order to satisfy strongly the lower part of the Tonti's diagram [14], the constitutive laws (23 a-b) have to be introduced in (12), i.e. :…”

Section: B Magnetic Vector Potential Formulationsmentioning

confidence: 99%

Finite Element Modeling of Shunt Reactors Used in High Voltage Power Systems

Duc

Hoai

et al. 2021

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Shunt reactors are important components for high-voltage and extra high voltage transmission systems with large line lengths. They are used to absorb excess reactive power generated by capacitive power on the lines when no-load or under-load occurs. In addition, they play an important role in balancing the reactive power on the system, avoiding overvoltage at the end of the lines, and maintaining voltage stability at the specified level. In this paper, an analytical method based on the theory of magnetic circuit model is used to compute the electromagnetic fields of shunt reactors and then a finite element method is applied to simulate magnetic field distributions, joule power losses, and copper losses in the magnetic circuit. In order to reduce magnetic flux and avoid magnetic circuit saturation, it is necessary to increase the reluctance of the magnetic circuit by adding air gaps in the iron core. The air gaps are arranged along the iron core to decrease the influence of flux fringing around the air gap on shunt reactors' total loss. Non-magnetic materials are often used at the air gaps to separate the iron cores. The ANSYS Electronics Desktop V19.R1 is used as a computation and simulation tool in this paper.

Efficiency Improvement of Permanent Magnet BLDC Motors for Electric Vehicles

Quốc

Huy

2021

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A permanent magnet Brushless DC (BLDC) motor has been designed with different rotor configurations based on the arrangement of the permanent magnets. Rotor configurations strongly affect the torque and efficiency performance of permanent magnet electric motors. In this paper, different rotor configurations of the permanent magnet BLDC motor with parallel the Halbach array permanent magnet were compared and evaluated. Many applications of electric drives or air-crafts have recently preferred the surface-mounted permanent magnet design due to its ease of construction and maintenance. The finite element technique has been used for the analysis and comparison of different geometry parameters and rotor magnet configurations to improve efficiency and torque performance. A comprehensive design of a three-phase permanent magnet BLDC 35kW motor is presented and simulations were conducted to evaluate its design. The skewing rotor and Halbach magnet array are applied to the permanent surface-mounted magnet on the BLDC motor for eliminating torque ripples. In order to observe the skewing rotor effect, the rotor lamination layers were skewed with different angles and Halbach sinusoidal arrays. The determined skewing angle, the eliminated theoretically cogging torque, and the back electromotive force harmonics were also analyzed.