Design of synchronous reluctance motors with improved power factor

Mohanarajah, T.; Rizk, Jamal; Nagrial, M.; Hellany, A.

doi:10.1109/cpe.2017.7915194

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…On the other hand, SynRM (Figure 2(f)) exhibits high saliency due to its grain-oriented anisotropy and hybrid flux guides. The saliency of SynRM must be as high as practically possible to attain a high-performance machine [8]. Although PMSynRM is not included in Figure 2, its saliency ratio is higher than that of SynRM.…”

Section: Analysis Of Synrmmentioning

confidence: 99%

“…(10). As the impact of ribs is already known, it is selected as constant for the entire optimization [8,27]. The optimizer is given higher freedom in searching optimum design by assigning individual variables for each barrier thickness (B n 1 , B n 2 , B n 3 and B n 4 ).…”

Section: Pm Optimizationmentioning

confidence: 99%

“…SynRM is known for its high torque density in a compact size. On the other hand, it is also renowned for poor power factor (pf) and torque ripples [8,9]. The PMSynRM has a combination of reluctance (dominant) and magnetic torque components with improved pf and torque ripples in a compact size compared with its counterparts [1,[10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Method to Optimize Permanent Magnet Assisted Synchronous Reluctance Machines

Mohanarajah

Nagrial

Rizk

et al. 2020

Electric Power Components and Systems

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CONTENTS 1. Introduction 2. Analysis of SynRM 3. Conclusion References Abstract-This paper presents the characteristics of permanent magnets in a synchronous reluctance machine by employing analytical and finite element methods. Four possible designs are studied and their characteristics are compared against a base synchronous reluctance machine with linear barriers to reveal machine characteristics. Then, the paper proposes a novel optimization topology to optimize permanent magnet synchronous reluctance machine as a single object for better machine performance. An explicit investigation is conducted to reveal the operational behavior of the machine such as torque, power factor and torque ripples with various machine parameters and compares them with the base design. The study reveals that permanent magnet synchronous reluctance machine can be optimized to have significantly high-power factor and torque with acceptable torque ripples.

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Section: Analysis Of Synrmmentioning

confidence: 99%

Section: Pm Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Method to Optimize Permanent Magnet Assisted Synchronous Reluctance Machines

Mohanarajah

Nagrial

Rizk

et al. 2020

Electric Power Components and Systems

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“…LSSRelM has high torque density, no rotor current losses, low rotor inertia and is costeffective [3,4]. In spite of a few favourable things, low power factor and high contents of torque ripple are the notable drawbacks [5]. The torque ripple developed by the machine is due to the interaction between the stator slots, and the rotor slots and its magnetic reaction to the stator magneto-motive force (MMF), that is the leakage flux, which is not synchronous, make the rotor to oscillate [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of rotor cage resistance in torque ripple reduction for line start synchronous machines

Ganesan

Lenin

2019

IET Electric Power Applications

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The interaction of spatial harmonics of electrical loading and the rotor anisotropy causes torque ripple in line start synchronous reluctance motor (a type of synchronous motor). A novel design technique for torque ripple reduction is presented in this study. Initially, synchronous reluctance motor filled with conducting material inside the flux barrier (called cage barrier) is optimised using a genetic algorithm (GA) technique. The optimised design is further verified using finite element analysis (FEA) and tested. To reduce the ripple content, the rotor has been introduced with an additional d-axis cage. Six rotor structures with an additional cage have been designed and optimised using FEA. The numerical analysis results are compared for all rotor structures. The optimised rotor structures with and without d-axis cage are fabricated and tested. Experimental results reveal that the fabricated rotor with an additional cage has reduced torque ripple and high efficiency. Finally, the acoustics test is carried out for both the fabricated structures and results are compared.

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“…Scientific research of RSM is oriented towards improving some performances of IM [4,5] with an ability to withstand higher temperature [6] or to produce a higher torque in the same rotor volume [7][8][9][10] which means the torque per unit (volume or mass) is higher than in the case of IM. Other research can be focused on RSM design optimization by means of various methods such as by using multi-objective optimization with an altered bee colony optimization and Taguchi method [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Saturation on Field Oriented Control of the New Designed Reluctance Synchronous Motor

Rafajdus¹,

Hrabovcová²,

Lehocký³

et al. 2018

Energies

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In this paper the effect of saturation on torque production of a reluctance synchronous motor (RSM), which was originally built as an induction motor (IM), is investigated. The rotor was replaced with new one, designed as synchronous reluctance cageless rotor with barriers, the shape and number of which were optimized to maximize the reluctance ratio. The torque measurement was done while the RSM was fed by frequency converter controlled by a microcontroller with closed loop field oriented control strategy to find out how saturation effects the developed torque at various values of the currents and speeds. It is shown how the load angle at which the maximum torque was achieved is changed. It was found out that the load angle was shifted to higher values depending on the speed of operation.

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Design of synchronous reluctance motors with improved power factor

Cited by 10 publications

References 14 publications

A Novel Method to Optimize Permanent Magnet Assisted Synchronous Reluctance Machines

A Novel Method to Optimize Permanent Magnet Assisted Synchronous Reluctance Machines

Influence of rotor cage resistance in torque ripple reduction for line start synchronous machines

Effect of Saturation on Field Oriented Control of the New Designed Reluctance Synchronous Motor

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