AC Machine Systems

Gao, Jingjing; Xiangheng, Wang; Zhang, Linzheng

doi:10.1007/978-3-642-01153-5

Cited by 30 publications

(14 citation statements)

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“…Therefore, the j 2 th space MMF generated by the j 1 th harmonic currents of the A-phase three parallel branch is the sum of Formulas (19), (20), and (21)…”

Section: Analysis Of Typical Examplesmentioning

confidence: 99%

“…The sum of all torques generated by the harmonic magnetic field is considered, so as to draw a comprehensive conclusion. In the second section, we use the multiloop analysis method of an ac motor [20] to build the EMT calculation model for the generator with ISCFW. This method can be used to analyze the relationship between the voltage and flux of each loop based on the actual connection conditions of the generator rotor and stator windings.…”

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confidence: 99%

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Theoretical Analysis and Calculation Model of the Electromagnetic Torque of Nonsalient-Pole Synchronous Machines With Interturn Short Circuit in Field Windings

Zhou

2015

IEEE Trans. Energy Convers.

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This paper studies the electromagnetic torque (EMT) of a nonsalient-pole synchronous generator with the interturn short circuit of field windings (ISCFW). First, the virtual displacement method serves as a basis for analyzing the postfault steady-state harmonic characteristic of EMT. The interactions among various space magnetic fields with different orders, speeds, and rotation directions generated by the stator and rotor are considered. A general conclusion on the EMT characteristics under the fault is then derived. Second, based on the connection conditions of the rotor and stator windings under the fault, the voltage and flux relationships among each circuit are analyzed and the calculation model of the EMT under the fault is built. Through comparisons among the simulations, experiments, and theoretical analyses, the correctness of the calculation model is verified. In addition, a three-polepair nonsalient-pole synchronous generator after transformation is used for the case study. The calculation and analysis results indicate that ISCFW generates ac pulsation components with their harmonics closely linked to the stator winding configuration. This paper deepens the fault mechanism of ISCFW and lays a foundation for fault monitoring based on mechanical characteristics.Index Terms-Electromagnetic torque (EMT), fault monitoring, field winding, harmonic characteristic, interturn short circuit. . His research interests include power system analysis and automation, smart grid, electric machine and its system, traction power supply system of highspeed railway, and the reliability and risk assessment of electrical equipment.Yanzhen Zhou received the B.S. degree from the

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“…Therefore, the j 2 th space MMF generated by the j 1 th harmonic currents of the A-phase three parallel branch is the sum of Formulas (19), (20), and (21)…”

Section: Analysis Of Typical Examplesmentioning

confidence: 99%

mentioning

confidence: 99%

Theoretical Analysis and Calculation Model of the Electromagnetic Torque of Nonsalient-Pole Synchronous Machines With Interturn Short Circuit in Field Windings

Zhou

2015

IEEE Trans. Energy Convers.

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“…The motor can either decelerate down to complete stop or oscillate around a non-zero speed. Rearranging (9) and integrating results in the following expression,…”

Section: -6mentioning

confidence: 99%

“…[7][8][9] In addition, trade-o®s between parameters a®ecting the starting process have hardly ever been discussed or determined quantitatively and the pull-into-step mechanism has been analyzed mainly from the moment the SM reached the sub-synchronous speed. Therefore, the manuscript clari¯es the process of SM asynchronous starting via well-known equation of Newton's second law of motion by revealing the similarity between the unloaded SM pull-into-step mechanism and phase locked loop (PLL) synchronization procedure.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Motor Pull-in Process Analysis

Vainer

Epshtein

Tapuchi

et al. 2015

J CIRCUIT SYST COMP

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In this paper, simple approach to analyzing the starting procedure of synchronous motors (SMs) is presented with an emphasis on the pull-in process. Instead of the classical, mostly intuitive pulling-repelling torque approach, an analytical method based on the motor mechanical part swing equation is employed. Factors a®ecting starting and pull-in processes are clearly indicated and torque impulse balance leading to a pull into step is revealed. It is shown that if the motor fails to pull into step within a single oscillation, it can still be synchronized during one of the succeeding acceleration periods. The crucial role of the excitation winding energizing instant is demonstrated as well. Moreover, the revealed similarity between the SM and phase locked loop (PLL) operations, leads to the conclusion that the algorithms use for analyzing the operation of one may be employed for investigating the other. Experimental results are given to demonstrate the di®erent scenarios, mentioned in the manuscript.

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“…Since flux density B PM equals the product of the PM magnetomotive force and permeance coefficient [15],…”

Section: Flux Densitymentioning

confidence: 99%

Design and Analysis of Permanent Magnet Motor With Movable Stators

Lai¹,

Liu²,

Peng³

2014

PIER B

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Abstract-Permanent-magnet motors are widely used in-wheel motors of electric vehicles and hybrid vehicles. Based on a movable stator design, this paper presents a new type permanent-magnet motor, whose torque can be adjusted in order to meet different driving requirements. The stator geometry is varied by means of changing movable stator positions. Accordingly, the air-gap length in permanentmagnet motors is changed so that torque can be adjusted. To derive an analytical model, Fourier series expansions are employed to formulate air-gap geometry variation. The analytical model is validated by finite element numerical results. Concerning motor torque variation capability achieved in this study, the ratio of the largest vs. the smallest torque is 2.3.

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AC Machine Systems

Cited by 30 publications

References 0 publications

Theoretical Analysis and Calculation Model of the Electromagnetic Torque of Nonsalient-Pole Synchronous Machines With Interturn Short Circuit in Field Windings

Theoretical Analysis and Calculation Model of the Electromagnetic Torque of Nonsalient-Pole Synchronous Machines With Interturn Short Circuit in Field Windings

Synchronous Motor Pull-in Process Analysis

Design and Analysis of Permanent Magnet Motor With Movable Stators

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