Comparison between the salient-pole synchronous machine and the double-fed induction machine with regards to electromagnetic parasitic forces and stator vibrations

Lugand, Thomas; Schwery, A.

doi:10.1109/icelmach.2016.7732826

Cited by 7 publications

(9 citation statements)

References 14 publications

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“…Second, that in cases where low order radial forces cause vibration problems, the problem can be significantly reduced by rearranging the winding configuration. Again, this reinforces the conclusions made in [8] and [6] about the usefulness of winding-reconfiguration when the goal is to reduce low order radial forces.…”

Section: Original Configuration Rrr -T-t-t Sss -R-r Ttt -S-s-s Rr -T-supporting

confidence: 78%

“…It was claimed in [6] that the reduction in airgap gave a proportional increase in the main flux density component that interacted to produce most of the lowest order radial force component. Similar studies, where the airgap length is reduced, has not been found for large, salient pole synchronous hydrogenerators.…”

Section: Introductionmentioning

confidence: 99%

“…Another option is to retrofit the machine into a doubly-fed induction generator (DFIG) by replacing the salient pole rotor with a new, round rotor. This was done for a 12 MVA, 102-slot/10-pole generator in [6]. The airgap length was reduced from 20 mm to 6 mm, resulting in a severe vibration problem.…”

Section: Introductionmentioning

confidence: 99%

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Influence of winding layout and airgap length on radial forces in large synchronous hydrogenerators

Engevik

Valavi

Nysveen

2017

2017 20th International Conference on Electrical Machines and Systems (ICEMS)

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Abstract-This paper investigates the flux density and radial force spatial harmonics in large salient pole synchronous hydrogenerators. Vibration due to magnetic forces are mainly caused by low order harmonics in the airgap flux density distribution. The influence of winding layout and airgap length on the lowest order radial force component are analysed. Airgap flux density and radial force density distributions of three different generators are computed using finite element calculations. The flux density components that contributes to the lowest order force component, and the source for these harmonic components, are investigated. It is found that reducing the airgap length leads to a less than proportional increase in the lowest order radial force component. A rearrangement of the winding layout is found to be an effective method for reducing the lowest order radial force component.

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Section: Original Configuration Rrr -T-t-t Sss -R-r Ttt -S-s-s Rr -T-supporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Influence of winding layout and airgap length on radial forces in large synchronous hydrogenerators

Engevik

Valavi

Nysveen

2017

2017 20th International Conference on Electrical Machines and Systems (ICEMS)

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“…They describe the energy conversion in an electric machine and are represented by a system of differential equations, consisting of equations of voltages, and the equations of motion of the movable element of motor at general assumptions for ACD, working in special operation modes [4,5,[14][15][16][17][18]. DFM was implemented on the example of electric machine type 4АК160S8U3 with synchronous rotation frequency n 0 =750 [rpm], power P 2 =5.5 [kW], nominal stator current I n =18.35 [A], η=80 [%], cosφ n =0.76 [4].…”

Section: Resultsmentioning

confidence: 99%

“…Formation algorithm of ACD polyharmonic operation mode has been developed; it allows changing the oscillation frequency, phase shift and oscillation amplitude. This method allows to withstand requirements to self-balancing grizzley at the stage of necessary vibrations formation [14][15][16][17][18].…”

Section: Methodsmentioning

confidence: 99%

Special Modes of AC Drives Operation in the Mining Industry

et al. 2017

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Abstract. This paper presents research of special modes of AC drives operation. The possibility of obtaining of vibrational and vibrationalrotational modes of the AC drives on the basis of multipurpose polyharmonic mode of actuating motor operation is shown. Multipurpose electric motor with improved power characteristics (double-fed machine) has been proposed as the actuating motor of the electroactivator of the coal grizzley. The formation algorithm of polyharmonic operation mode of the double-fed machine is developed. This algorithm allows studying different types of special modes of actuating motor. Research results of dynamic parameters of a universal electric motor of the electroactivator of the coal grizzley are presented. The practical significance of the study of using of double-fed machine in the primary coal processing is shown.

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Design and performance analysis of magnetic slot wedge application in double‐fed asynchronous motor‐generator by finite‐element method

Xiao

Zhou

Wang

et al. 2018

IET Electric Power Applications

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In this study, an improvement method for double-fed asynchronous motor-generators (DFAMG) design with open slots is proposed to reduce the capacity demand of rotor converter for the first time. The proposed method is achieved by decreasing the air-gap length (AGL) and applying conductive and magnetic rotor slot wedges. The design method of magnetic slot wedges and AGL in large DFAMG is presented. The mechanical analysis of a large DFAMG prototype reveals the necessity of using metal rotor wedges. To precisely investigate the influence of magnetic wedges in DFAMG, a two-dimensional fieldcircuit coupled model is proposed to consider the effects of rotor converter. Several wedge configurations of commercially available products are designed and analysed. The relationships between the electromagnetic properties of rotor wedges and prototype performance are investigated. The feasibility and advantage of the proposed method in DFAMG design are verified. A guidance for applying the proposed method in design improvement of large DFAMG is developed.

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Comparison between the salient-pole synchronous machine and the double-fed induction machine with regards to electromagnetic parasitic forces and stator vibrations

Cited by 7 publications

References 14 publications

Influence of winding layout and airgap length on radial forces in large synchronous hydrogenerators

Influence of winding layout and airgap length on radial forces in large synchronous hydrogenerators

Special Modes of AC Drives Operation in the Mining Industry

Design and performance analysis of magnetic slot wedge application in double‐fed asynchronous motor‐generator by finite‐element method

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