Line-Start Permanent-Magnet Motors: Significant Improvements in Starting Torque, Synchronization, and Steady-State Performance

Aliabad, Aliakbar Damaki; Mirsalim, Mojtaba; Ershad, Nima Farrokhzad

doi:10.1109/tmag.2010.2070876

Cited by 91 publications

(22 citation statements)

References 10 publications

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“…The permanent magnet synchronous motors with ability to startup by the direct connection to the grid (Line Start Permanent Magnet Synchronous Motors -LSPMSM) have become the point of interest to many research teams all over the world [1][2][3]. The key reasons are: the higher efficiency and power factor of LSPMSM in relation to the classical asynchronous motors together with no need to use the power electronics drives that are necessary to operate the classical permanent magnet synchronous motors [4,5].…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of the asynchronous torque in LSPMSM with non-symmetrical squirrel cage winding

Jędryczka

Wojciechowski

Demenko

2014

International Journal of Applied Electromagnetics and Mechanics

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The paper focuses on the analysis of the asynchronous torque of the line start permanent magnet synchronous motor (LSPMSM) with the asymmetrical squirrel cage winding. In order to calculate the asynchronous torque the parametrical fieldcircuit models of LSPMSM have been elaborated on. Further, the models have been applied to investigate the impact of squirrel cage asymmetry on the asynchronous torque. The evaluated asynchronous torque vs. rotor speed characteristic of proposed motor with asymmetrical cage has been compared with the characteristics of reference asynchronous motor and LSPMSM with symmetrical cage winding. It has been found that deepening of chosen bars of the cage improves the starting properties of the LSPMSM.

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Section: Introductionmentioning

confidence: 99%

Finite element analysis of the asynchronous torque in LSPMSM with non-symmetrical squirrel cage winding

Jędryczka

Wojciechowski

Demenko

2014

International Journal of Applied Electromagnetics and Mechanics

View full text Add to dashboard Cite

show abstract

“…Line-start permanent magnet synchronous motors (LSPMSMs) have the advantage of a high power factor, high efficiency, wide economic operation range, and high power density by using a permanent magnet (PM) to generate a strong magnetic field [1][2][3][4][5]. At the time, brake torque occurs and causes a major drawback for the starting period by decreasing the start torque [6][7][8]. In addition, the LSPMSM keeps synchronous speed in a steady state, and the ability of the rotor to pull in synchronization is also a key point for LSPMSMs [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Stator Winding Turns on the Steady-State Performances of Line-Start Permanent Magnet Synchronous Motors

Qiu

Zhang

et al. 2019

Energies

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The variation of stator winding turns will directly affect the key parameters of a motor, such as winding resistance and winding reactance, which further affect the steady-state performance of the motor. In order to get excellent steady-state performance from line-start permanent magnet synchronous motors (LSPMSMs) under different load powers, taking an 11 kW LSPMSM as an example, the finite element method (FEM), combined with the steady-state phasor diagram and torque angle characteristic, are used in this paper for the optimal design of the stator winding turns of the prototype. The correctness of the model is verified by comparing the experimental data with the calculated data. First, the influences of different stator winding turns on the no-load, back-induced electromotive force (EMF), as well as on inductance and overload ability are studied, and the variation mechanism is obtained. In addition, from the perspective of the torque angle characteristic, the influence of the change in synchronous inductance caused by the number of turns on the steady-state power angle is studied. Second, the variation of the current and power factors with turn number is obtained by studying the steady-state power angle and end voltage. Based on the coupling relationship between the no-load back EMF and the power angle, the mechanism of non-linear variation of current and power factor is revealed. Finally, the variation of the number of turns on the core loss and eddy current loss is analyzed under various operating conditions, and the variation mechanism is revealed, based on the armature reaction theory.

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“…Voltage unbalance is one of the most common power quality problems. By installing permanent magnets (PMs) in the squirrel‐cage rotor, the line start permanent magnet synchronous motor (LSPMSM) has excellent steady‐state performance of high efficiency, high power factor and high torque density . It can also start up directly from the grid and is easily affected by voltage unbalance.…”

Section: Introductionmentioning

confidence: 99%

Influence of voltage unbalance on the steady‐state performance of line start permanent magnet synchronous motors

Qiu

et al. 2019

IEEJ Transactions Elec Engng

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The line start permanent magnet synchronous motor (LSPMSM) can be used for direct-on-line (DOL) starting, so it is easily affected by voltage unbalance. Based on the finite element method (FEM) and analytical method, the influence of voltage unbalance on the steady-state performance of LSPMSM is studied in this paper. A two-dimensional finite element model is built, and the armature current, losses and torque ripple as a function of the phase voltage unbalance rate (PVUR) are obtained. The influence mechanism of voltage unbalance on the steady-state performance of a motor is demonstrated. Finally, a prototype of LSPMSM is manufactured and tested. By comparing the experimental data with the simulation data, the accuracy of the calculation model is verified, and the correctness of the research is proved. Hongbo Qiu(Non-member) received his graduation degree from the Harbin University of Science and Technology, Harbin, China, and a Ph.D. in electrical engineering from the same university in 2014. He has been with the Zhengzhou University of Light Industry, Zhengzhou, China, since 2014. His research interests include electromagnetic and thermal analysis on electrical machines, especially in permanent magnetic machines.

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Line-Start Permanent-Magnet Motors: Significant Improvements in Starting Torque, Synchronization, and Steady-State Performance

Cited by 91 publications

References 10 publications

Finite element analysis of the asynchronous torque in LSPMSM with non-symmetrical squirrel cage winding

Finite element analysis of the asynchronous torque in LSPMSM with non-symmetrical squirrel cage winding

The Influence of Stator Winding Turns on the Steady-State Performances of Line-Start Permanent Magnet Synchronous Motors

Influence of voltage unbalance on the steady‐state performance of line start permanent magnet synchronous motors

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