Optimal rotor shape design of 3-step skew spoke type BLAC motor to reducing cogging torque

Kim, Sung An; Choi, Gui Dong; Lee, Ju; Cho, Yun Hyun

doi:10.3233/jae-2005

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…In APMMs, choosing a suitable skew angle can significantly reduce the components of a particular time harmonic [22]. The skew rotor technique mitigates the cogging torque and torque ripples in the motor, suppressing the vibro-acoustic behavior due to the reduction in specific time harmonic components [23]. Most of the harmonic components can be suppressed by adopting an optimal skew angle in step-skew rotor configuration.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Axial Flux Permanent Magnet Machine with Phase Group Concentrated Coil Winding

et al. 2022

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This paper suggests a method to improve the performances of the Dual Stator Axial Flux Spoke-type Permanent Magnet (DSAFSPM) machines with phase group concentrated coil (PGCC) windings, by incorporating continuous and discrete step-skewing along with a special winding connection. The purpose of the study is to mitigate the cogging torque and torque ripples while increasing the output torque so it ameliorates the machine performance at minimum cost for various applications such as wind power plants and electric vehicles (EVs). Cogging torque produces noise and vibrations which degrade the machine’s performance and reduces its life span. The proposed winding sequence enhances the output torque by improving its distribution factor along with the use of continuous skew and step-skew magnets. This research work improved the cogging torque and torque ripples with the help of skew techniques while output torque is increased by the proposed winding sequence. Further harmonics and ripples are also mitigated by the proposed winding sequence. The overall machine volume is kept constant along with the magnet size and the design parameters for fair performance analysis. Comparative analysis of these machines is performed using three-dimensional (3-D) time-stepped finite element analysis (FEA). Proposed model I and proposed model II reduce the harmonics by 42% and 23%, respectively. By using continuous skew and discrete step-skew magnets, cogging torque is reduced up to 81.5% and 75%, respectively. This reduction in cogging torque reduces the noise and vibration in machines which assists the machines to perform a smooth operation. The reduction in output torque ripples in proposed model I is 60.8% while that of proposed model II is 59.3%.

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Section: Introductionmentioning

confidence: 99%

Performance Improvement of Axial Flux Permanent Magnet Machine with Phase Group Concentrated Coil Winding

et al. 2022

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“…Permanent magnet synchronous machines (PMSM) are used in many industrial application and household appliances because they offer a highly efficient, high power-density, low size alternative to other machines such as induction machine (IM) and switched reluctance motor (SRM) [1]. However, PMSM has torque ripple which referring to a periodic increase or decrease in output torque as the motor shaft rotates.…”

Section: Introductionmentioning

confidence: 99%

An Improved Dynamic Modeling of Permanent Magnet Synchronous Machine with Torque Ripple Characteristics

Kim¹,

Song²,

Han³

et al. 2018

JOCET

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A mechanical vibration and acoustic noise of permanent magnet synchronous machines (PMSM) are caused by the torque ripple due to the non-sinusoidal back electromotive force (BEMF). The accurate modeling with a torque ripple is essential to improve the torque characteristics of PMSM. The torque ripple that appears because of the interaction between the flux of the PM and the stator teeth. A general dynamic modeling of PMSM has only a magnetic torque and a reluctance torque. Therefore, the dynamic modeling of the PMSM is a need to apply the influence of the harmonics. This paper proposes an improved modeling of the PMSM considering the torque ripple characteristics. The theoretical basis of the torque ripple and individual definition of the model block is explained. The effectiveness of this proposed modeling is verified by the simulation and experiment according to the comparison of the output characteristics between the traditional and proposed modeling. Index Terms-Back electromotive force harmonics, fast fourier transform, permanent magnet synchronous machine, torque ripple, modeling.

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“…The square-wave current is always used to drive the trapezoidal back-EMF motor, which is called as PM BLDCM in general [11][12][13][14][15][16]. And the sinusoidal-wave current is always used to drive the sinusoidal back-EMF motor, which is called as PM BLACM in general [17][18][19][20]. These two current waveforms and their improvements have been used for several different motors [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

Yang

Zhu

2018

IET Electric Power Applications

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The permanent magnet brushless motors (PMBLM) are utilised extensively in many high-performance applications where smoothness of output torque is necessary. When driven with conventional square-wave current, the PMBLM is hard to make full use of inverter capacity because of short current supply time. Besides, it is hard to produce smooth output torque because the phase inductances slow down the desired step response of the phase current seriously. Although the sinusoidalwave current changes continuously, there exists a fixed-frequency torque ripple for trapezoid back-electromotive force motor. To solve the problems, two novel current supply methods, called as staircase waveform and parabola-trapezoid waveform, are proposed in this study. With the same phase current magnitude as square waveform, the staircase waveform can output two times torque with low-resolution position sensors. The parabola-trapezoid supply method can further improve the smoothness of doubled output torque by unique parabolic rising and falling edge waveform design, while a high-resolution position sensor is needed. Simulation and experimental tests of four different current supply methods are given to corroborate the effectiveness of the proposed method in inverter utility and torque ripple reduction.

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Optimal rotor shape design of 3-step skew spoke type BLAC motor to reducing cogging torque

Cited by 7 publications

References 14 publications

Performance Improvement of Axial Flux Permanent Magnet Machine with Phase Group Concentrated Coil Winding

Performance Improvement of Axial Flux Permanent Magnet Machine with Phase Group Concentrated Coil Winding

An Improved Dynamic Modeling of Permanent Magnet Synchronous Machine with Torque Ripple Characteristics

Parabola‐trapezoid and staircase current supply methods for PMBLM with full inverter utility and reduced torque ripple

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