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Predicting Electromagnetic Noise in Induction Motors
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Numerical Analysis, NA.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Prediktering av elektromagnetiskt ljud iinduktionsmotorer (Swedish)
Abstract [en]

Induction motors are used in many applications, especially in our daily modes of transportation such as trains, cars, buses, trucks, etc. As a consequence, they contribute a significant amount of noise in the environment, which can cause serious problems on the human well-being. This thesis aims to simulate induction motors in order to predict the noise produced by the electromagnetic forces generated in the motors. Simulations can help the engineers with a noise-efficient design. In this work, COMSOL1 Multiphysics ®r 4.4 software is used for the modeling. The two squirrel-cage induction motors are studied. Motor1 is a benchmark design while Motor3 models a device manufactured at ABB2. Under no load condition, both motors show results in accordance with the theory of induction motors. The results of Motor3 obtained with COMSOL Multiphysics are compared with Adept (an in-house software of ABB for modeling motors). Acoustics modeling was done for Motor1. As expected, noise in Motor1 is contributed by the electromagnetic force and resonance with natural frequencies of the motor.

Abstract [sv]

Induktionsmotorer används för många tillämpningar, till exempel, i transportmedel såsom bilar, bussar, lastbilar, etc. Som en följd bidrar de till en betydande mängd buller som kan påverka människornas välbefinnande och även hälsa. Denna avhandling syftar till att simulera motorer för att förutsäga den ljudnivå som genereras på grund av de elektromagnetiska krafterna i motorer. Simuleringar kan hjälpa ingenjörerna med en effektivare design av motorer med avseende på ljud. I detta arbete är COMSOL Multiphysics ® 4.4 den mjukvara som används för modellering av två asynkronmotorer. Motor1 är ett riktmärke konstruktion och Motor3 modeller en anordning tillverkats i ABB. Utan last visar båda motorerna resultaten i enlighet med teorin om asynkronmotorer. Resultaten som beräknades på Motor3 med hjälp av COMSOL Multiphysics jämförs med Adept (en programvara utvecklad av ABB för modellering motorer). Akustiska beräkningar gjordes på Motor1. Som väntat bullernivåer bidragit av storleken av den elektromagnetiska kraften och den resonans med egenfrekvenser av motorns.

Place, publisher, year, edition, pages
2014.
Series
TRITA-MAT-E, 2014:48
National Category
Computational Mathematics
Identifiers
URN: urn:nbn:se:kth:diva-150353OAI: oai:DiVA.org:kth-150353DiVA: diva2:742541
External cooperation
ABB
Subject / course
Scientific Computing
Educational program
Master of Science - Computer Simulation for Science and Engineering
Supervisors
Examiners
Available from: 2014-09-02 Created: 2014-09-02 Last updated: 2014-09-02Bibliographically approved

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