Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions

Akay, Ali; Lefley, Paul

doi:10.3390/en14092615

Cited by 10 publications

(14 citation statements)

References 39 publications

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“…Torque ripple is caused by a change in the magnetic energy between the permanent magnets of the rotor and slots of the stator of a PMSM [19]. When the magnetic energy changes depending on the relative position of the magnetic pole and slot in a rotating motor, a reluctance torque is generated by the slot structure; this results in a torque ripple, which causes noise and vibrations in traction motors.…”

Section: Torque Ripplementioning

confidence: 99%

Optimization of a Permanent Magnet Synchronous Motor for e-Mobility Using Metamodels

Kim

You

2022

Applied Sciences

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Permanent magnet synchronous motors (PMSMs) with rectangular coils in hairpin windings exhibit improved fill factor and reduced end turn of the coils, which in turn improve the efficiency and power density of PMSMs, making them ideal for e-mobility applications. Herein, the shape of a PMSM was optimized for torque ripple reduction using metamodels to improve the noise and vibrational performance of the motor. The objective function of the optimal design aimed to minimize the torque ripple, and the average torque and efficiency were set as constraints. The notch width and depth and barrier length were selected as the design variables to satisfy the objective function and constraints. Using the optimal Latin hypercube design technique, 27 experimental points were selected, and a finite element analysis (FEA) was performed for each point. Furthermore, a function approximation was performed using six metamodels, and the best metamodel was selected using the root mean square error test. Moreover, the optimization was performed by combining the best metamodels for each variable with a sequential two-point diagonal quadratic approximation optimization algorithm. The torque ripple was improved by approximately 1.63% compared with the initial model, whereas the constraint values remained constant. Finally, an FEA was performed on the optimal point, and the FEA results matched with those of the optimal method.

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Section: Torque Ripplementioning

confidence: 99%

Optimization of a Permanent Magnet Synchronous Motor for e-Mobility Using Metamodels

Kim

You

2022

Applied Sciences

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“…Multiphase machines have a higher winding distribution factor than three-phase machines with the same number of slots per pole and phase in addition to the same relative coil pitch The publications that deal with additional degrees of freedom usually focus on the increase in power density due to harmonic injection and the calculation of the ideal ratio between time harmonics [7,9,10] or design of the specific electric machine that uses the additional degrees of freedom [11][12][13][14][15]. Papers dealing with the calculation of the equivalent circuit parameters are mostly focused on the fundamental harmonic component and they describe changes that occur with a higher number of phases [8,16,17].…”

Section: Winding Distribution Factormentioning

confidence: 99%

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

2021

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The usage of multiphase electrical drives expands the operation possibilities of electrical machines and opens new directions of research on inverter-fed electrical machines. With an increasing number of phases, the standard approach of the electromagnetic design of machines has to be generalized to m-phase systems, which is not usually respected in the literature focused on electric machine design, and it is rarely published. This paper summarizes the specific problems linked with the design of machines with different numbers of phases, focusing on the winding design and the calculation of equivalent circuit parameters. In addition to the direct effect of different numbers of phases, the impact of injecting higher order time harmonic components on the electromagnetic design of electric machines is analyzed. The obtained analytical results are verified by the measurement of a nine-phase experimental induction motor.

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“…However, torque ripples caused by multi-harmonics in NS-EMFs cannot be eliminated. Especially, study [15] proposes I-power approach for NS-EMF five-phase machines in which additional currents are added to phase currents to compensate torque ripples. However, only finite element simulations are considered without the impact of varying reference currents on control quality.…”

Section: Introductionmentioning

confidence: 99%

“…Adaline, the simplest type of ANN, requiring low computational demand with advantages such as fast response, self-learning, and easy-to-implement, can be found in [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. An Adaline in [18] is used to estimate the q-axis current of a three-phase PMSM in real time.…”

Section: Introductionmentioning

confidence: 99%

“…As MTPA in [10,11], all reference d-q currents in [20] have high-frequency oscillations, challenging PI controllers at high speed. Other Adalines can be found in [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] to eliminate harmonic components in d-q currents which are caused by multi-harmonics in NS-EMFs or nonlinearity of power converters. However, although constant d-q currents are obtained, smooth torque cannot be guaranteed because NS-EMFs with multi-harmonics in d-q frames are time-variant.…”

Section: Introductionmentioning

confidence: 99%

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Adaline-Based Control Schemes for Non-Sinusoidal Multiphase Drives–Part I: Torque Optimization for Healthy Mode

Nguyen

Semail

et al. 2021

Energies

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More degrees of freedom not only enable multiphase drives to be fault-tolerant but also allow non-sinusoidal electromotive forces (NS-EMFs) in high-quality vector control. NS-EMFs lead to lower costs of design and manufacturing of electrical machines. However, the presence of multi-harmonics in NS-EMFs possibly generates pulsating torque in both healthy and faulty conditions of multiphase drives. To facilitate the use of NS-EMFs, this two-part study proposes control schemes to adaptively improve torque quality of multiphase drives in dealing with multi-harmonics of NS-EMFs. The proposed schemes are based on a simple but effective type of artificial intelligence, Adaptive Linear Neuron (Adaline). The knowledge of multiphase drives including the harmonic ranks of NS-EMFs and the rotor position is exploited to design the online-trained optimal Adalines. The first part of this study is to propose a control scheme using an Adaline for healthy mode with high-quality torque regardless of numerous harmonics in NS-EMFs. The second part of this study introduces a control scheme using another Adaline for open-circuit faults. The proposed schemes are numerically and experimentally validated on a seven-phase permanent magnet synchronous machine (PMSM) possessing a high total harmonic distortion (THD = 38%) of NS-EMFs.

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Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions

Cited by 10 publications

References 39 publications

Optimization of a Permanent Magnet Synchronous Motor for e-Mobility Using Metamodels

Optimization of a Permanent Magnet Synchronous Motor for e-Mobility Using Metamodels

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

Adaline-Based Control Schemes for Non-Sinusoidal Multiphase Drives–Part I: Torque Optimization for Healthy Mode

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