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Reduction of Audible Noise of a Traction Motor at PWM Operation
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0003-0355-7456
2018 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

A dominating source for the radiated acoustic noise from a train at low speeds is the traction motor. This noise originates from electromagnetic forces acting on the structure resulting in vibrations on the surface and thus radiated noise. It is often perceived as annoying due to its tonal nature. To achieve a desirable acoustic behavior, and also to meet legal requirements, it is of great importance to thoroughly understand the generation of noise of electromagnetic origin in the motor and also to be able to control it to a low level.

In this work, experimental tests have been performed on a traction motor operated from pulse width modulated (PWM) converter. A PWM converter outputs a quasi-sinusoidal voltage created from switched voltage pulses of different widths. The resulting main vibrations at PWM operation and their causes have been analyzed. It is concluded that an appropriate selection of the PWM switching frequency, that is the rate at which the voltage is switched, is a powerful tool to influence the noise of electromagnetic origin. Changing the switching frequency shifts the frequencies of the exciting electromagnetic forces. Further experimental investigations show that the trend is that the resulting sound power level decreases with increasing switching frequency and eventually the sound power level reaches an almost constant level. The underlying physical phenomena for the reduced sound power level is different for different frequency ranges. It is proposed that the traction motor, similar to a thin walled cylindrical structure, shows a constant vibration over force response above a certain frequency. This is investigated using numerical simulations of simplified models. Above this certain frequency, where the area of high modal density is dominating, the noise reducing effect of further increasing the switching frequency is limited.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2018. , s. 28
Serie
TRITA-AVE, ISSN 1651-7660 ; 2017:93
Nyckelord [en]
electromagnetic noise, pulse width modulation (PWM), switching frequency, traction motor
Nationell ämneskategori
Farkostteknik Strömningsmekanik och akustik
Forskningsämne
Farkostteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-220885ISBN: 978-91-7729-649-2 (tryckt)OAI: oai:DiVA.org:kth-220885DiVA, id: diva2:1171972
Presentation
2018-02-06, E2, Lindstedtsvägen 3, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20180109

Tillgänglig från: 2018-01-09 Skapad: 2018-01-08 Senast uppdaterad: 2018-01-09Bibliografiskt granskad
Delarbeten
1. Operational deflection shapes of a PWM-fed traction motor
Öppna denna publikation i ny flik eller fönster >>Operational deflection shapes of a PWM-fed traction motor
2016 (Engelska)Ingår i: Conference Proceedings of the Society for Experimental Mechanics Series, Springer, 2016, s. 209-217Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Operational deflection shapes of an asynchronous traction motor for railway applications are investigated. The radiated noise from the tractionmotor on a train is, especially at low speeds, dominated by noise generated by electromagnetic forces. The tested motor is fed by a pulse-width-modulated (PWM) frequency converter for which the voltage is modulated as a series of pulses that are switched with a certain frequency. In this case, PWM force lines can be expected to influence the radiated noise. Therefore, detailed knowledge about the frequencies and deflection shapes of vibrations generated by PWM forces is of great importance for understanding and controlling the radiated noise and its spectral content. Vibration levels are measured on the stator shield and the operational deflection shapes are studied for several PWM switching frequencies and motor speeds. The deflection shapes with the largest vibration levels are determined. These are then compared to the expected excitation resulting from the pure PWM force lines. Changing the switching frequency, will shift the frequencies of the exciting forces. An appropriate selection of the PWM switching frequency is therefore important for the resulting acoustic radiation from the motor. © The Society for Experimental Mechanics, Inc. 2016.

Ort, förlag, år, upplaga, sidor
Springer, 2016
Nyckelord
Electromagnetic noise, Operational deflection shapes (ODS), Pulse-width-modulation (PWM), Traction motor, Vibrations, Acoustic noise, Acoustic noise measurement, Acoustic wave propagation, Counting circuits, Damage detection, Deflection (structures), Gears, Machinery, Pulse width modulation, Rotating machinery, Structural dynamics, Switching frequency, Testing, Vibration measurement, Voltage control, Acoustic radiation, Electromagnetic forces, Operational deflection shapes, Pulse-width-modulated, Railway applications, Spectral content, Traction motors
Nationell ämneskategori
Maskinteknik
Identifikatorer
urn:nbn:se:kth:diva-194590 (URN)10.1007/978-3-319-30084-9_20 (DOI)000387431500020 ()2-s2.0-84978656521 (Scopus ID)9783319300832 (ISBN)
Konferens
34th IMAC, A Conference and Exposition on Structural Dynamics, 2016, 25 January 2016 through 28 January 2016
Anmärkning

Correspondence Address: Amlinger, H.; KTH Royal Institute of Technology, The Marcus Wallenberg Laboratory for Sound and Vibration Research (MWL), KTH Railway GroupSweden; email: amlinger@kth.se. QC 20161102

Tillgänglig från: 2016-11-02 Skapad: 2016-10-31 Senast uppdaterad: 2018-01-09Bibliografiskt granskad
2. Reduction of radiated acoustic noise of a traction motor at PWM converter operation
Öppna denna publikation i ny flik eller fönster >>Reduction of radiated acoustic noise of a traction motor at PWM converter operation
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord
acoustic noise, pulse width modulation (PWM), switching frequency, traction motor
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
urn:nbn:se:kth:diva-220882 (URN)
Anmärkning

QC 20180109

Tillgänglig från: 2018-01-08 Skapad: 2018-01-08 Senast uppdaterad: 2018-01-09Bibliografiskt granskad

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