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Magnetic flux leakage9/18/2023 ![]() Moottorin pyöriessä hajavuon indusoima signaali muistuttaa siniaaltoa. Tässä työssä tutkitaan, voisiko hissimoottorin pyörimisnopeuden laskea hyödyntämällä moottoriin asennettujen kestomagneettien tuottamaa magneettista hajavuota. Hissivalmistajat toimivat tiukasti kilpaillussa ympäristössä, jossa tuotteiden laadulle ja turvallisuudelle on tarkat vaatimukset, mutta myös kova hintapaine. Nykyaikaiset nopeussäätöjärjestelmät mahdollistavat korkean tarkkuuden, mutta ovat usein kalliita. Hissin tarkalla nopeussäädöllä on olennainen vaikutus matkustajien turvallisuuteen ja ajomukavuuteen. Using suitable error correction, the speed information is calculated with sufficient accuracy. The most significant error sources are identified and possible correction methods are discussed. A leakage flux–based speed estimation method is evaluated both with simulated and measured leakage flux data. Using a suitable post-processing method and an analog-to-digital converter, the speed of the machine can be calculated without the need for an expensive angle sensor. As the machine rotates, a signal created by the magnetic flux resembles a sine wave. In this work, it is investigated whether it is possible to determine the rotation speed of an elevator motor by just using the magnetic stray flux created by the permanent magnets embedded in the machine. Elevator manufacturers operate in a highly competitive industry which has strict requirements for product quality and safety, but also a high cost pressure. Modern speed control solutions for electric machines enable a high degree of accuracy and precision, but they often come with substantial costs. A precise speed control of an elevator is essential for passenger safety and ride comfort.
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