Research into the Causes of Undesired Synchronisation Between the Motor Speed and the PWM Modulation Frequency in a PM BLDC Drive

• Autorzy: Tutaj Andrzej , Drabek Tomasz , Piatek Pawel , Kocwa Pawel , Baranowski Jerzy

Identyfikatory

DOI

10.17274/AEZ.2023.54.02

Warianty tytułu

PL

Badania przyczyn niepożądanej synchronizacji prędkości obrotowej silnika z częstotliwością modulacji PWM w układzie napędowym PM BLDC

• Języki publikacji: EN

Abstrakty

EN

In a drive system comprising a high- speed PM BLDC motor and an inverter implementing motor phases commutation and phase voltages PWM modulation, a spontaneous synchronisation between the PWM modulation frequency and the motor rotational speed may occur. The drive behaves like an unintended phase locked loop. The effect distorts mechanical characteristic of the drive by introducing flat segments where the rotational speed remains constant despite changing load torque. It makes the speed - torque relationship discontinuous, nonlinear, and non unique. The phenomenon is closely related to the problem of phase current and motor torque ripples. The paper presents experimental results recorded with a laboratory test bench for drives for electric power tools where the phenomenon of the parasitic speed locking has been observed. A root cause of this effect is discussed, and the mechanism of unwanted synchronisation is investigated. Several mitigation techniques are proposed and verified with computer simulations.

PL

W układzie napędowym składającym się z wysokoobrotowego silnika PM BLDC i falownika realizującego komutację faz silnika i modulację napięcia fazowego PWM może wystąpić spontaniczna synchronizacja częstotliwości modulacji PWM z prędkością obrotową silnika. Efekt ten zniekształca charakterystykę mechaniczną napędu poprzez wprowadzenie płaskich segmentów, w których prędkość obrotowa pozostaje stała pomimo zmieniającego się momentu obciążenia. W pracy przedstawiono wyniki doświadczeń zarejestrowane na laboratoryjnym stanowisku badawczym dla napędów elektronarzędzi, na którym zaobserwowano zjawisko pasożytniczej synchronizacji prędkości. Przeanalizowano i omówiono przyczyny tego zjawiska. Zaproponowano kilka technik łagodzenia jego skutków i zweryfikowano je za pomocą symulacji komputerowych.

Słowa kluczowe

EN

PM BLDC; parasitic phase locked loop; speed-frequency synchronisation

PL

PM BLDC; pasożytnicza pętla synchronizacji; synchronizacja prędkość

• Wydawca: INFOTECH
• Czasopismo: Automatyka, Elektryka, Zakłócenia
• Rocznik: 2023
• Tom: Vol. 14, nr 4(54)
• Strony: 34--52
• Opis fizyczny: Bibliogr. 26 poz., fot., rys., tab., wykr.

Twórcy

autor

Tutaj Andrzej

• AGH University of Krakov

• https://orcid.org/0000-0003-2845-3135

autor

Drabek Tomasz

• AGH University of Krakov

• https://orcid.org/0000-0002-9426-9398

autor

Piatek Pawel

• AGH University of Krakov

• https://orcid.org/0000-0001-9950-0547

autor

Kocwa Pawel

• AGH University of Krakov

• https://orcid.org/0009-0006-7261-5831

autor

Baranowski Jerzy

• AGH University of Krakov

• https://orcid.org/0000-0003-3313-581X

Bibliografia

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Uwagi

1. Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).

2. This work was partially funded by the National Centre for Research and Development (Narodowe Centrum Badań i Rozwoju- NCBiR) Polish state agency as part of Bezszczotkowa wysokomomentowa zakrętka elektromechaniczna - Brushless electric torque tool (BETT) project within the Applied Research Programme, agreemment number PBS3/B4/13/2015 and partially from AGH University of Krakov subvention for scientific activity no 16.16.120.773.

3. The work of the last author was in the scope of a project titled "Process Fault Prediction and Dedection" witch was finansed by The National Science Centre on the base of desision no. UMO-2021/41/B/ST7/03851.