Improvement of Starting Performance for Line-Start Permanent Magnet Motors by Winding Reconfiguration

Lin, Mengxuan; Li, Dawei; Zhao, Yu; Ren, Xiang; Qu, Ronghai

doi:10.1109/tia.2020.2968277

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…Many articles have dealt with approaches other than optimization to improve the properties of LSPMSMs. In [20], the authors studied the possibilities of starting performance improvement by changing the stator winding configurations. Further, the method based on pole changing of LSPMSM was studied in [21].…”

Section: Introductionmentioning

confidence: 99%

Topology Optimization of Rotor Bars Geometry and Arrangement for a Line-Start Permanent Magnet Synchronous Machine

et al. 2021

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An optimally designed line-start permanent magnet synchronous machine may require a different squirrel-cage design than traditional induction machines. The objective of this paper is to apply topology optimization based on the normalized Gaussian network in order to find the optimal shape of the rotor bars for a line-start permanent magnet synchronous machine. This approach facilitates optimizing the shape of the bar, without the limitation of a predefined bar geometry and arrangement, as is usually considered for classic induction machine design. For this study, a previously designed four-pole line-start permanent magnet synchronous machine with a rated power of 1.5 kW is used as an initial design. To verify the accuracy of performance evaluation by utilizing finite-element methods, a prototype of this machine was built and tested. Then, verified model of line-start permanent magnet machine is used for topology optimization of its rotor cage area. The outcome of the optimization is the Pareto front, from which three optimized designs are selected. Finally, these designs are analyzed and proved to have better steady-state performance than the initial machine. The results provide new insights for the design of squirrel-cage bars for line-start permanent magnet synchronous machines.INDEX TERMS AC machines, line-start permanent magnet machine, optimization, permanent magnet machines.

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Section: Introductionmentioning

confidence: 99%

Topology Optimization of Rotor Bars Geometry and Arrangement for a Line-Start Permanent Magnet Synchronous Machine

et al. 2021

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“…Consequently, the demand for measures to reduce energy consumption has also increased. Owing to these economic and environmental problems, significant research efforts have been devoted toward developing highly efficient electrical machines as an alternative to conventional machines with high energy consumption [1]- [3]. This is a result of increased customer awareness regarding…”

Section: Introductionmentioning

confidence: 99%

“…low life-cycle costs, high efficiency, and compatibility as well as increased sensitivity toward environmental challenges. For instance, in industrial applications and academia, line-operated induction motors (IMs) are being replaced with line-start permanent magnet motor, owing to their high power factor (PF) and efficiency regardless of the variations in load [1], [2], [4]. LSPM motors offer a highly energy-efficient alternative to IMs, which are extensively used in industries for various applications such as low-cost electric drives, pumping systems, and compressors [1]- [3], [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…The LSPM motor operates as a synchronous motor in the steady operating condition due to the presence of magnets under the rotor bars. The LSPM motor runs at a constant speed, and the PM buried in the squirrel-cage rotor generates a reluctance torque component as a result of rotor saliency [1], [6], [8]. Therefore, this motor incorporates the benefits of the conventional interior permanent magnet (IPM) synchronous motor (high efficiency, high PF, and high torque density) and the IM (a robust construction and line-start capability).…”

Section: Introductionmentioning

confidence: 99%

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Analytical Modeling for Optimal Rotor Shape to Design Highly Efficient Line-Start Permanent Magnet Synchronous Motor

Waheed

2020

IEEE Access

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In this study, an analytical technique for the rotor geometry optimization based on lumped magnetic parametric approach is used to design a two-pole, three-phase, 7.5-kW line-start permanent magnet (LSPM) synchronous motor. The permanent magnet shape substantially affects the air-gap flux density distribution, back electromotive force (EMF) as well as the copper loss, which have a great impact on the performance characteristics of the permanent magnet synchronous motors. Principal advantages involve in adjusting the rotor shape are to achieve the effective air-gap flux density and optimize the fundamental component of the back EMF with low harmonic content for minimum ripple torque. Therefore, to enhance the efficiency (η) and power factor, an optimized slot shape considering various design parameters is selected for the permanent magnet of the rotor in the prototype LSPM machine. A linear saturated lumped magnetic parametric model is developed to exhibit magnetic characteristics, and analytical equations are acquired under the open-circuit condition without considering the slotting effect for design simplicity. The influence of design variables on the air-gap flux density distribution and the flux leakage is investigated precisely using an analytical circuit model. A parametric study of the prototype model demonstrates that the steady-state performance of the LSPM motor are significantly influenced by the design variables. The inductance saliency ratio and electromagnetic torque components are carefully analyzed in terms of their effects on the load characteristics of the LSPM motor in order to determine the optimal shape of the PM slots and the magnetic flux barriers. The validity of the proposed method has been checked by evaluating the numerical solution of the analytical model using a two-dimensional finite element method.INDEX TERMS Analytical method, air-gap flux density, FEM, lumped parametric model, parametric study, rotor design.

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“…One is a structure in which a secondary conductor bar is embedded on the outer diameter side of the rotor based on the structure of a PMSM. These motors are named line-start type PMSMs (LS-PMSMs) [2][3][4][5][6][7][8][9][10][11][12]. It consists of a combination of an IM and an embedded PMSM.…”

Section: Introductionmentioning

confidence: 99%

Verification of effect of secondary conductor bar on starting characteristics in line‐start type self‐excited wound‐field synchronous motor

Aoyama

Mizuta

Ito

2020

IET Electric Power Applications

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This study clarifies experimentally the effect of the secondary conductor bar on line-start characteristics in a line-start type self-excited wound-field synchronous motor. This motor is based on a brushless wound-field synchronous motor having a rotor winding connected to a diode rectifier circuit. And it has a secondary conductor bar that is independently connected at a pitch of one pole, without end-ring. First, the operation principle of the proposed motor and its magnetic circuit design are described, and then the details of the prototype for principle verification are clarified. Next, when the combination of the connecting of the secondary conductor bar is changed, an experiment of line-starting characteristics and measured rotor field current is demonstrated. Consequently, it was clarified that the influence on the synchronous pull-in, speed ripple, and rotor field current.

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Improvement of Starting Performance for Line-Start Permanent Magnet Motors by Winding Reconfiguration

Cited by 15 publications

References 19 publications

Topology Optimization of Rotor Bars Geometry and Arrangement for a Line-Start Permanent Magnet Synchronous Machine

Topology Optimization of Rotor Bars Geometry and Arrangement for a Line-Start Permanent Magnet Synchronous Machine

Analytical Modeling for Optimal Rotor Shape to Design Highly Efficient Line-Start Permanent Magnet Synchronous Motor

Verification of effect of secondary conductor bar on starting characteristics in line‐start type self‐excited wound‐field synchronous motor

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