Experimental analysis of noise and vibration for large brushless doubly fed machines

Abdi, Salman; Llano, Danilo X.; Abdi, Ehsan; Malliband, P.D.; McMahon, R.A.

doi:10.1049/joe.2017.0425

Cited by 9 publications

(7 citation statements)

References 16 publications

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“…− " ± ( , similar to what was found at 440 rpm. The time and space harmonic contents in the BDFM torque, PW and CW currents, and active powers and their contribution in the machine vibration were studied in [29], [30]. Fig.…”

Section: B Measured Vibration Spectramentioning

confidence: 99%

Vibration Analysis of Brushless Doubly Fed Machines in the Presence of Rotor Eccentricity

Abdi

Toshani

et al. 2020

IEEE Trans. Energy Convers.

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In this work, an analytical study has been performed on the Brushless Doubly Fed Machine's (BDFM) vibration due to the interaction of its fundamental magnetic fields, exerting bending forces in the back iron. The effects of rotor eccentricity on exacerbating the machine's vibration have been considered by assessing the stator back iron displacement function in the presence of rotor eccentricity. Finite element analysis is carried out for a 250 kW BDFM built in frame size D400 to validate the analytical methods. The stator back iron displacement is determined for an ideally-constructed machine as well as when the rotor has static and dynamic eccentricity. In addition, the prototype BDFM was tested at different operating conditions in order to examine its noise and vibration levels. A set of measurements was conducted to assess the main vibration component frequencies developed by the machine at different rotor speeds. It is shown that the main vibration components are created by bending setup in the back iron, rotor eccentricity, and the components with time and space harmonic natures. The results obtained from finite element analysis and experimentally agree with the analytical theory of BDFM vibration.

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Section: B Measured Vibration Spectramentioning

confidence: 99%

Vibration Analysis of Brushless Doubly Fed Machines in the Presence of Rotor Eccentricity

Abdi

Toshani

et al. 2020

IEEE Trans. Energy Convers.

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“…Fig .9. Unbalance rotation of the shaft inside the bearing Table 7 Typical evaluation criteria zone vibration magnitude (mm/s) [12]…”

Section: Recommendation For the Future Workmentioning

confidence: 99%

Measurements of Vibration and Noise Level at Different Cement Companies

Ali

Alwan²

2020

Tikrit j. eng. sci.

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The aim of this article is to compare Vibration and Noise measurements caused by different types of Machines at cement factories with the standard evaluation criteria of Vibration ISO 2631 – 4 EVS – EN 5349 – 2 and Noise following the standard ISO 9612 – 2009. Two cement companies were chosen, the first is located at Baddish district, 30km west of Mosul city (Iraq), which is called Baddish general cement company, while the other is located south of Mosul, and is called Hammam Al-Alil general cement company. Three stations were chosen for each company (raw materials grinding mills, cement grinding mills, and exhaust fan stations) having different electrical motor capacities. Noise level meter and vibration level meter manufactured by B & K (DENEMARK) were used for measurement. The location of bearing was chosen for vibration measurement, while the location of the operator’s ears for noise measurement, where chosen. It was found that most of the readings in vibration levels were unacceptable according to the evaluation criterion of vibration magnitude and noise level higher than 85dBA due to rotating unbalance misalignment and faulty gear matching (ISO 1940/1, 1990).

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“…Therefore, the stator construction has to be conventional with uniformly distributed teeth and slots. However, the analysis of saturation behaviour is notably more complex than in a conventional machine as has been found in practice [16]. The hysteresis component of the core losses cannot be predicted using Steinmetz's equation [17] as the field distribution is non-sinusoidal or has a DC-offset so the value must be computed directly from the area of the hysteresis loop, which may be predicted using a hysteresis model [18].…”

Section: A Stator Reference Frame Field Distribution Characteristicsmentioning

confidence: 99%

“…The above characteristics have been confirmed experimentally by comparing the positive and negative peak flux density values in the rotor teeth and core back sections of two BDFIMs computed using finite element analysis with measured values. Both the frame size D180 and the 250 kW BDFIMs considered have 4-pole and 8-pole stator windings and a nested loop type of rotor whose details are given in Table I, using the approach in [16]. The flux density values were measured using a single turn flux coil wound around the tooth and core back sections.…”

Section: B Rotor Field Distribution Characteristics and Implicationsmentioning

confidence: 99%

Brushless Doubly Fed Machine Magnetic Field Distribution Characteristics and Their Impact on the Analysis and Design

Mathekga

Ademi

McMahon

2019

IEEE Trans. Energy Convers.

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This paper contributes to the characterisation of the brushless doubly fed induction machine (BDFIM), which is attractive as a variable speed generator in applications (offshore wind turbine) with minimum maintenance requirements. The BDFIM has two three-phase stator windings of different pole numbers housed within the same stator slots and a shortcircuited rotor winding capable of coupling fields of different pole numbers. The stator windings and rotor winding create a magnetic field distribution with a range of characteristics different to those of conventional induction machines. This paper presents an analysis to identify the field characteristics and discusses their impact on the analysis and design of the BDFIM. The characteristics are determined from an analysis of the sum of two rotating sinusoidal field waveforms and confirmed by comparison with time-stepping finite element results and measured magnetic flux density data.Index Terms-Brushless doubly fed machine (BDFM), flux density, field distribution, rotor design, core loss, standing wave.

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Experimental analysis of noise and vibration for large brushless doubly fed machines

Cited by 9 publications

References 16 publications

Vibration Analysis of Brushless Doubly Fed Machines in the Presence of Rotor Eccentricity

Vibration Analysis of Brushless Doubly Fed Machines in the Presence of Rotor Eccentricity

Measurements of Vibration and Noise Level at Different Cement Companies

Brushless Doubly Fed Machine Magnetic Field Distribution Characteristics and Their Impact on the Analysis and Design

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