Suppressing Pulsating Torques: Torque Ripple Control for Synchronous Motors

Nakao, Noriya; Akatsu, Kan

doi:10.1109/mias.2013.2288383

Cited by 123 publications

(49 citation statements)

References 12 publications

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“…6 , 1 , and 6 are harmonic parameters of back-EMF in frame. Due to the harmonics in (4), the torque expression cannot be formed as a constant torque coefficient multiplied by the [21].Therefore, the formula (2) is given on account of nonideal back-EMF by the mechanism of torque production in PMSM.…”

Section: Dynamic Model and Problem Formulationmentioning

confidence: 99%

Torque Ripple Minimization in PMSM Based on an Indirect Adaptive Robust Controller

Tao

Zhao

2017

Mathematical Problems in Engineering

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This paper addresses the problem of torque ripple minimization in permanent magnet synchronous motor (PMSM), which plays an important role in modern aerospace industry. Accurate motion control and disturbance compensation are challenging issues of PMSM systems, where the nonlinear disturbances are quite complicated and various uncertainties exist. To overcome these control problems, based on the adaptive robust control (ARC) algorithm, an indirect adaptive robust controller (IARC) with a robust recursive least square (RRLS) adaption law is proposed as a solution. A modified PMSM model which indicates the torque ripple generation is first derived. The IARC in current loop is then described, holding the good tracking performance of ARC algorithm and minimizing the torque ripples while speed tracking. The RRLS adaption law in IARC is synthesized based on modified model and then a correction factor is added to enhance the robustness of this adaptation law. This can enable the better parametric estimation and adaptive compensation to minimize the torque ripples. The stability of the system with the proposed controller is proved. Finally, the effectiveness of the proposed method is demonstrated by the simulation results.

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Section: Dynamic Model and Problem Formulationmentioning

confidence: 99%

Torque Ripple Minimization in PMSM Based on an Indirect Adaptive Robust Controller

Tao

Zhao

2017

Mathematical Problems in Engineering

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“…In practice, cogging torque is reduced at the design stage, but it does not necessarily minimize torque ripple [2], [11]. In this paper, the focus is on cogging torque mitigation, but some torque ripple minimization techniques are proposed in [2], [3], [12] and [13].…”

Section: Ieee Transactions On Industrial Electronicsmentioning

confidence: 99%

Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Wanjiku

Khan

Barendse

et al. 2015

IEEE Trans. Ind. Electron.

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Slotted axial-flux machines have excellent power and torque densities. However, it is difficult to reduce their cogging torque due to the complexity associated with implementing classical techniques. In this paper, slot-opening widths and tooth-profiles will be shown to be significant in mitigating cogging torque in these machines. In particular, varying the slot-opening reduced it by 52 %, whereas a paralleltooth (rectangular) profile lowered it by 24 %, when compared to a conventional trapezoidal-tooth profile. An analytical quasi 3-D analysis was formulated and used to analyse and determine cogging torque. It was validated numerically and experimentally. Its versatility is in its ability to analyse different shapes of poles and slot-openings, which can be extended to model airgap nonuniformities. The paper also presents cogging torque minimization techniques that maintain the ease of manufacture of the parallelteeth stator. Experimental results showed a 73 % and 48 % reduction in cogging torque; achieved by the use of alternating pole-arcs and skewed poles. NOMENCLATURE aSlot-opening depth 0278-0046 (c)

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“…The existing torque ripple minimization approaches can be mainly categorized into two classes. One is the design based approaches, which focus on optimizing the geometric structure of the machine stator and rotor to minimize the toque ripples [9]- [11]. The other is the control based approaches, which focus on optimizing the stator current to smooth the PMSM's output torque [12]- [17].…”

mentioning

confidence: 99%

“…The key to the control based approach is the design of stator current to generate an extra torque ripple to cancel the original torque ripple produced by the imperfection of machine design and manufacturing [11], [18]. In the control based approach, at first, a torque ripple model makes a torque ripple prediction, and then an optimization algorithm optimizes the stator current to minimize the predicted torque ripple.…”

mentioning

confidence: 99%

“…Therefore, the torque ripple models developed for SPMSMs are not applicable to the IPMSMs because they neglect the torque ripples in the reluctance torque. Based on the magnetic coenergy model, the torque ripple from the reluctance torque is considered in [11], [19], [20], to extend the torque ripple model for IPMSMs. It is found that the torque ripple model involves the inductance terms that are varying with the load conditions/stator currents due to magnetic saturation [21]- [23].…”

mentioning

confidence: 99%

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Torque Ripple Modeling and Minimization for Interior PMSM Considering Magnetic Saturation

Lai

Guo

Mukherjee

et al. 2018

IEEE Trans. Power Electron.

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Torque ripple modelling and minimization for interior permanent magnet synchronous machines (IPMSMs) requires accurate information of the inductances which vary nonlinearly due to magnetic saturation. However, existing approaches fail to consider the magnetic saturation and thus their performance is limited under different load conditions. Therefore, this paper improves the torque ripple model by considering magnetic saturation, and employs this model for optimal current design to improve the performance of torque ripple minimization for IPMSMs under different load conditions. At first, numerical studies are performed to analyze and understand how magnetic saturation affects the torque ripples in IPMSMs. Then, a novel torque ripple model for IPMSMs is developed, in which the inductance term is replaced by exploring the machine electrical model. This improved torque ripple model is computation-efficient and it can provide fast and accurate torque ripple prediction. Based on this model, a genetic algorithm (GA) based optimal stator current design approach is proposed to minimize the torque ripple in IPMSMs. The proposed GA-based approach can adaptively optimize the stator current under different load conditions, which can guarantee the robust performance of torque ripple minimization under different saturation levels. The proposed approach is validated through experimental test on a laboratory IPMSM drive system. Index Terms--Geneticalgorithm, magnetic saturation, optimal stator current design, torque ripple modeling and minimization I. NOMENCLATURE t total Total torque T 0 Average torque t h Harmonic torque t cog Cogging torque t ecc Torque induced by cross-coupling effect L d , L q dq-axis inductances L dq , L qd dq-axis mutual inductances . Her research areas include modelling, control and testing of permanent magnet machines and switched reluctance machines. Guodong Feng (M'15) received the B.S. and Ph.D degrees in Engineering

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Suppressing Pulsating Torques: Torque Ripple Control for Synchronous Motors

Cited by 123 publications

References 12 publications

Torque Ripple Minimization in PMSM Based on an Indirect Adaptive Robust Controller

Torque Ripple Minimization in PMSM Based on an Indirect Adaptive Robust Controller

Influence of Slot Openings and Tooth Profile on Cogging Torque in Axial-Flux PM Machines

Torque Ripple Modeling and Minimization for Interior PMSM Considering Magnetic Saturation

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