Damper windings phenomena of synchronous machines during system oscillations

Matsuki, Junya; Katagi, Takeshi; Okada, Takao

doi:10.1109/60.300134

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…The related remarkable studies about the effect of damper winding in SG design are as follows: Matsuki et al [4] investigated the effect of slot ripples on damper windings of SG. Two years later, they considered the oscillatory conditions of the power system and investigated the damper winding performance of a SG [5]. Vetter and Reichert [6] presented a study on damper winding currents of a SG with a solid iron rotor.…”

Section: Introductionmentioning

confidence: 99%

Rotor design optimization of a synchronous generator by considering the damper winding effect to minimize THD using grasshopper optimization algorithm

Karaoğlan

Perin²

2022

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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The aim of this study is to calculate the optimum factor levels for the design parameters namely slot pitch, center slot pitch, and damper width to keep the magnetic flux density distribution in a desired range while minimizing the total harmonic distortion (THD). For this purpose, the numerical simulations are performed in the Maxwell environment. Then by the aid of regression modeling over this simulation results; the mathematical equations between the responses (THD and magnetic flux density distribution) and the factors are calculated. After the modeling phase, grasshopper optimization algorithm (GOA) is run through these regression equations to determine the optimum values of the rotor design parameters (factors). The confirmations are also performed in the Maxwell environment and the result indicated that the THD is minimized and the magnetic flux density distribution on the teeth is kept in a desired range.

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Section: Introductionmentioning

confidence: 99%

Rotor design optimization of a synchronous generator by considering the damper winding effect to minimize THD using grasshopper optimization algorithm

Karaoğlan

Perin²

2022

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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“…The previously stated ''hunting'' and ''pull-out'' conditions also occur in synchronous machine including Permanent Magnet Synchronous Machine (PMSM). Occasionally, these machines are equipped with conductor bars called damper bars which act as squirrel-cage winding in induction machine [24]- [28]. These damper bars perform not only for line starting of synchronous machine but also for improving dynamic motion by damping of torque oscillations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of Surface-Mounted Permanent Magnet Type Coaxial Magnetic Gear With Damper Bar Considering Magnetic Field Modulation Effect

Shin

Chang

2022

IEEE Access

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Coaxial Magnetic Gear (CMG) has unstable dynamic characteristics by hunting or pull-out action of the output rotor when the load or speed are changed, unlike traditional mechanical gears. These dynamic characteristics need to be improved in order to secure the reliability of mechanical power transmission system by fast and accurate response. In this paper, the damper bar used in synchronous machines is considered as a method to improve the dynamic characteristics of CMG. The Surface-mounted Permanent Magnet (SPM) type CMG is selected as the analysis model. The space harmonics of the magnetic flux density of stationary and rotary members of CMG namely, modulating pieces, inner and outer rotor, are analyzed and characterized the influence of them on the improvement of dynamic characteristics as well as torque reduction. Also, the magnetic flux density characteristics and the damping effect are compared according to the position of the damper bars on two rotors and the modulating pieces. In conclusion, the considerations about the perspective for design and application are presented when using the damper bar for SPM type CMG.INDEX TERMS Coaxial magnetic gear, damper bar, dynamic analysis, magnetic field modulation effect, space harmonics.

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