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Lecturer(s)
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Course content
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1) Course introduction; terminology; entry assumptions/demands on student. 2) Noise and vibrations in electrical machines: quantities, basic relations and equations; natural modes and frequencies; noise and vibration sources, standards. 3) Magnetic forces in electrical machines I: Maxwell Stress Tensor and Lorentz force; magnetostriction; radial, tangential and axial forces; force wavenumber, rotating and pulsating forces. 4) Magnetic forces in electrical machines II: stator and rotor magnetomotive force harmonics; permeance harmonics; air gap flux density spectrum. 5) Magnetic forces in electrical machines III: magnetic force spectrum under standard operation of the machine - effect of winding, slotting, saturation and PWM; magnetic force spectrum of the machine under non-standard operational states. 6) Reduction of noise and vibrations in electric machines: electromagnetic design; drive control; structural design. 7) Calculation and modeling methods of noise and vibrations excited by magnetic forces. 8) Faults in electrical machines and fault detection methods. 9) Experimental analysis of noise and vibrations: noise and vibration measurements; types of analysis; operational deflection shapes. 10) Experimental modal analysis and operational modal analysis. 11) Dimensioning of electric machines structural parts: machine frame; pole fixing; permanent magnet bandage; shaft. 12) Shaft stresses in steady state and transient states: shaft stresses; deflection, torsional and bending oscillations; critical speed and shaft natural frequencies; effect of unbalanced magnetic pull. 13) Lecture conducted by the selected expert from industry.
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Learning activities and teaching methods
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Laboratory work, Lecture
- Contact hours
- 52 hours per semester
- Preparation for an examination (30-60)
- 45 hours per semester
- Presentation preparation (report) (1-10)
- 6 hours per semester
- Preparation for laboratory testing; outcome analysis (1-8)
- 6 hours per semester
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| prerequisite |
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| Knowledge |
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| to describe operational principle and construction of different kinds of electrical machines |
| to differentiate among different types of winding in electrical machines |
| to desribe principle of electric drive control using frequency converter |
| to explain basic relations among electromagnetic field quantities |
| Skills |
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| to apply fundamentals of electrical machine measurements |
| to design induction and synchronous machine with both electrical excitation and permanent magnets |
| to utilize selected software for scientific and technical computing |
| to utilize selected software for finite element analysis of magnetic field |
| Competences |
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| N/A |
| N/A |
| learning outcomes |
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| Knowledge |
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| to explain the origin of magnetic forces in electrical machines, to describe the force spectrum, effect and impact of machine structural design on the forces |
| to describe sources of noise and vibrations in electrical machines, methods for their measurement, analysis and reduction |
| to describe possible faults in electrical machines and fault detection methods |
| to explain the rules and relations for dimensioning of electrical machines structural parts |
| to describe shaft stresses and vibrations in electrical machines and related problems |
| Skills |
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| to analyze magnetic forces in electrical machines |
| to apply vibrodiagnostic fundamentals on electrical machines |
| to design correct dimensioning of selected electrical machine structural parts |
| to calculate shaft stress in electric machine due to different types of loading |
| Competences |
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| N/A |
| teaching methods |
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| Knowledge |
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| Lecture |
| Interactive lecture |
| Multimedia supported teaching |
| Skills |
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| Laboratory work |
| Practicum |
| Skills demonstration |
| Competences |
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| Individual study |
| assessment methods |
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| Knowledge |
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| Combined exam |
| Skills |
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| Skills demonstration during practicum |
| Individual presentation at a seminar |
| Competences |
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| Individual presentation at a seminar |
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Recommended literature
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Bartoš, Václav. Teorie elektrických strojů. 1. vyd. Plzeň : Západočeská univerzita, 2006. ISBN 80-7043-509-7.
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Beran, Vlastimil. Chvění a hluk. 1. vyd. Plzeň : Západočeská univerzita, 2010. ISBN 978-80-7043-916-6.
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Brandt, Anders. Noise and vibration analysis : signal analysis and experimental procedures. Chichester : John Wiley & Sons, 2011. ISBN 978-0-470-74644-8.
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Gieras, Jacek Franciszek; Lai, Joseph Cho; Wang, Chong. Noise of polyphase electric motors. Boca Raton : CRC/Taylor & Francis, 2006. ISBN 978-1-4200-2773-0.
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Juha Pyrhonen, Tapani Jokinen, Valeria Hrabovcova. Design of Rotating Electrical Machines, 2nd Edition. Wiley, 2013. ISBN 978-1-118-58157-5.
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Kopylov, Igor Petrovič; Voženílek, Petr. Stavba elektrických strojů. 1. vyd. Praha : Státní nakladatelství technické literatury, 1988.
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Tavner, Peter. Condition monitoring of rotating electrical machines. 1st pub. London : Institution of Engineering and Technology, 2008. ISBN 978-0-86341-739-9.
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Wiedemann, E.; Kellenberger, W. Konstrukce elektrických strojů. 1. vyd. Praha : SNTL, 1973.
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