Using and enhancing the cogging torque of PM machines in valve positioning applications

Boroujeni, Samad Taghipour; Takorabet, Noureddine; Mezani, Smaïl; Lubin, Thierry; Haghgooie, Peyman

doi:10.1049/iet-epa.2020.0221

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…The reason that (32) cannot reduce the torque pulsation more, is that the effect of higher harmonic components in the torque pulsation is neglected in (32) (e.g., T r (1,4) and T r (2,6) ). In addition, the effect of magnetic saliency is neglected in (32).…”

Section: B Approach Efficacymentioning

confidence: 99%

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Torque ripple minimization in Consequent-Pole PM Machines using harmonic current injection

Boroujeni

Emami

Takorabet³

et al. 2022

Scientia Iranica

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In this paper, the torque ripple of consequent-pole PM machines (CPPMMs) is reduced by injecting 2 nd order harmonic of the armature current. In the proposed method, based on the machine back-emf spectrum and the current main harmonic, appropriate 2 nd order harmonic of the armature current is obtained. An analytical model is developed to obtain back-emf of CPPMMs. In addition, the obtained analytical model is used to compute the developed electromagnetic torque as a function of the armature currents. Validity of the analytical model is verified using finite-element analysis. To investigate the efficacy of the proposed 2 nd order current harmonic in torque ripple minimization, the optimum one is obtained separately by a direct search algorithm and the related electromagnetic torque waveforms for two different obtained 2 nd order current harmonics are compared together. The developed analytical model is used in the direct search algorithm for the torque waveform computation. Although the proposed method is not as exact as the direct search method, it is precise enough considering its negligible computation burden over the direct search method.

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Section: B Approach Efficacymentioning

confidence: 99%

“…In addition, there is zero tangential flux density at the lateral borders of the rotor slots (ϕ =±α r π/2p) as well as the odd symmetry in the circumferential flux density distribution the rotor slot region. Therefore, the general solution of the magnetic potential vector inside the rotor slot is expressed as given in (6).…”

mentioning

confidence: 99%

Torque ripple minimization in Consequent-Pole PM Machines using harmonic current injection

Boroujeni

Emami

Takorabet³

et al. 2022

Scientia Iranica

View full text Add to dashboard Cite

show abstract

“…Then, using a method that includes a high-pass digital filter, a low-pass digital filter, and a sample-and-hold function, the values of the dc components are obtained, and then the stator resistance is estimated. However, extracting the DC components is not easy since the magnitudes of the DC components are much smaller than the fundamental components and the frequency of the fundamental component depends on the rotor speed and hence on the operating point [29]. On the other hand, due to the current limitations of semiconductor devices, DC-signal injection methods cannot be directly applied to motors larger than 100 hp (75 kW) [23].…”

Section: Introductionmentioning

confidence: 99%

A Parameter-Free Method for Estimating the Stator Resistance of a Wound Rotor Synchronous Machine

Haghgooei

Jamshidpour

Corne

et al. 2023

WEVJ

Self Cite

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This paper presents a new online method based on low frequency signal injection to estimate the stator resistance of a Wound Rotor Synchronous Machine (WRSM). The proposed estimator provides a parameter-free method for estimating the stator resistance, in which there is no need to know the values of the parameters of the machine model, such as the stator and rotor inductances or the rotor flux linkage. In this method, a low frequency sinusoidal current is injected in the d axis of the stator current to produce a sinusoidal flux in the stator. In this paper, it is shown that the phase difference between the generated sinusoidal flux and the injected sinusoidal current is related to the stator resistance mismatch. Using this phase difference, the stator resistance is estimated. To validate the proposed model-free estimator, simulations were performed with Matlab Simulink and the results were compared with the extended Kalman filter observer. Finally, experimental tests, under different conditions, were performed to estimate the stator resistance of a WRSM.

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Analysis and reduction of cogging torque in direct‐drive external‐rotor permanent magnet synchronous motor for belt conveyor application

Song

Zhang

et al. 2021

IET Electric Power Appl

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Permanent magnet synchronous motor (PMSM) shows the great potential for use in direct drive system because of its excellent low‐speed direct‐drive capability. However, it suffers from the adverse effect of the cogging torque in comparison with the asynchronous motor. Therefore, reducing the cogging torque, especially the external‐rotor PMSM (ERPMSM) for belt conveyor application, is necessary for enhancing the stable operation and precise positioning performances of the belt conveyor.Herein, a novel tangential magnetization low‐speed high‐torque ERPMSM is proposed and analysed. Furthermore, the expression of the cogging torque of the proposed ERPMSM is derived by energy method. Based on the special structure of the ERPMSM, a new method for cogging torque reduction is introduced. The comparative FEA results for four ERPMSM models are presented to verify the accuracy and effectiveness of this method. The accuracy of the cogging torque FEA results is confirmed by a prototype. Finally, the influence of this method on ERPMSM performance is also analysed carefully in this paper.

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Using and enhancing the cogging torque of PM machines in valve positioning applications

Cited by 7 publications

References 22 publications

Torque ripple minimization in Consequent-Pole PM Machines using harmonic current injection

Torque ripple minimization in Consequent-Pole PM Machines using harmonic current injection

A Parameter-Free Method for Estimating the Stator Resistance of a Wound Rotor Synchronous Machine

Analysis and reduction of cogging torque in direct‐drive external‐rotor permanent magnet synchronous motor for belt conveyor application

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