Electromagnetic Performance due to Tooth-tip Design in Fractional-slot PM Brushless Machines

Jamil, Mohd Luqman Mohd; Zolkapli, Z. Z.; Jidin, Auzani; Othman, Raja Nor Firdaus Kashfi Raja; Sutikno, Tole

doi:10.11591/ijpeds.v6.i4.pp860-868

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…The saw-shaped moment of the motor is due to the uneven distribution of the magnetic induction of the motor in the air gap because of the different magnetic permeability of the tooth and the groove of the stator. This is based on the results of calculations reported in [6,11], as well as a stepped form of distribution of the magneto-driving force of the stator winding [12].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the effect of stator groove geometry in a traction synchronous reluctance motor with permanent magnets on the saw-shaped electromagnetic moment level

Liubarskyi

Riabov

Iakunin

et al. 2021

EEJET

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This paper reports the model of a magnetic field of the synchronous reluctance motor with permanent magnets that was developed on the basis of a finite-element method. The model was implemented in the FEMM finite-element analysis programming environment involving the application of the Lua-based script. The model makes it possible to determine the dependence of the engine's electromagnetic moment on the rotor rotation angle. Determining the level of a saw-shaped moment is important for assessing its harmful effect on the structural elements of the traction motor and the drive in general. The results of digital modeling have established the dependences of the electromagnetic moment on the rotor rotation angle. The moment has a variable component – the saw-shaped moment, whose amplitude for open grooves under a rated load mode is 182 Nm, and for semi-open grooves ‒ 90 Nm. The use of semi-open grooves exerts a positive effect on eliminating the saw-shaped moment in a synchronous reluctance motor with permanent magnets and may be recommended for further application on engines of this type. Semi-open grooves reduce the opening of the stator groove by 2 times and lead to a smoother flux distribution under the gear division. That reduces the oscillations of the main magnetic flux. The proposed application of semi-open stator grooves makes it possible to reduce by more than 2 times the level of a saw-shaped moment of the synchronous reluctance motor with permanent magnets under a rated mode. It has been determined that a rather positive factor is an increase of 4.8 % in the average motor moment value under a rated mode when using semi-open grooves. This is due to a decrease in the average value of magnetic resistance to the main magnetic flux. Therefore, with a simultaneous decrease in the moment's fluctuations, the transition to semi-open grooves makes it possible to improve the mass-dimensional indicators of the motor in general.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the effect of stator groove geometry in a traction synchronous reluctance motor with permanent magnets on the saw-shaped electromagnetic moment level

Liubarskyi

Riabov

Iakunin

et al. 2021

EEJET

View full text Add to dashboard Cite

show abstract

“…According to the results of the analysis reported in [11], it is noted that determining the size and parameters of electric motors can be carried out through numerical field calculations in combination with multicriteria optimization, as shown in [15]. The design methodology, considered in work [7], provides an opportunity to determine only the main parameters of the engine stator, the thickness and width of permanent magnets.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Procedure for selecting optimal geometric parameters of the rotor for a traction non-partitioned permanent magnet-assisted synchronous reluctance motor

Liubarskyi

Iakunin

Nikonov

et al. 2021

EEJET

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This paper reports the construction of a mathematical model for determining the electromagnetic momentum of a synchronous reluctance motor with non-partitioned permanent magnets. Underlying it is the calculation of the engine magnetic field using the finite-element method in the flat-parallel problem statement. The model has been implemented in the FEMM finite-element analysis environment. The model makes it possible to determine the engine's electromagnetic momentum for various rotor geometries. The problem of conditional optimization of the synchronous reluctance motor rotor was stated on the basis of the rotor geometric criteria. As an analysis problem, it is proposed to use a mathematical model of the engine's magnetic field. Constraints for geometric and strength indicators have been defined. The Nelder-Mead method was chosen as the optimization technique. The synthesis of geometrical parameters of the synchronous reluctance motor rotor with non-partitioned permanent magnets has been proposed on the basis of solving the problem of conditional optimization. The restrictions that are imposed on optimization parameters have been defined. Based on the study results, the dependence of limiting the angle of rotation of the magnet was established on the basis of strength calculations. According to the calculation results based on the proposed procedure, it is determined that the optimal distance from the interpole axis and the angle of rotation of magnets is at a limit established by the strength of the rotor structure. Based on the calculations, the value of the objective function decreased by 24.4 % (from −847 Nm to −1054 Nm), which makes it possible to significantly increase the electromagnetic momentum only with the help of the optimal arrangement of magnets on the engine rotor. The results of solving the problem of synthesizing the rotor parameters for a trolleybus traction motor helped determine the optimal geometrical parameters for arranging permanent magnets.

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“…Several techniques have been proposed to reduce radial forces in the airgap, torque ripple and cogging torque which are some of the major contributors to vibrations and thus noise. A common solution is to modify the machine design where solutions like skewing [2–4], selecting a suitable pole and slot number combination [4–9], selecting an adequate winding type [2, 10], magnet shaping [3], magnet positioning [2, 9, 11–13], adding dummy slots and teeth [2, 9, 11, 14] or reducing the slot opening [9, 15, 16], have been proven to be the most effective techniques for this purpose. These modifications on the design can also be applied combined to produce larger improvements on the acoustic performance.…”

Section: Introductionmentioning

confidence: 99%

Effect of tooth tips on the electromagnetic performance of PM fractional‐slot modular machines using grain‐oriented electrical steel

Maravi-Nieto¹,

Azar

Thomas

et al. 2019

J. eng.

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Electromagnetic Performance due to Tooth-tip Design in Fractional-slot PM Brushless Machines

Cited by 4 publications

References 21 publications

Determining the effect of stator groove geometry in a traction synchronous reluctance motor with permanent magnets on the saw-shaped electromagnetic moment level

Determining the effect of stator groove geometry in a traction synchronous reluctance motor with permanent magnets on the saw-shaped electromagnetic moment level

Procedure for selecting optimal geometric parameters of the rotor for a traction non-partitioned permanent magnet-assisted synchronous reluctance motor

Effect of tooth tips on the electromagnetic performance of PM fractional‐slot modular machines using grain‐oriented electrical steel

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