Thesis defense of Sergio Zarate

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Thesis defense of Sergio Zarate

THESIS

Thesis defense of Sergio Zarate

Title of the Thesis: Accionamiento de Alto Confort para Aplicaciones de Elevación. Obtained the SOBRESALIENTE rating.

2018·12·21

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  • Title of the thesis: Accionamiento de Alto Confort para Aplicaciones de Elevación
  • PhD programme: DOCTORATE PROGRAMME IN MECHANICAL ENGINEERING AND ELECTRICAL ENERGY
  • Directors of the thesis: Fco. Javier Poza Lobo y Gaizka Almandoz Larralde
  • Court:
    • President: Daniel Moríñigo Sotelo (Universidad de Valladolid)
    • Vocal: David Díaz Reigosa (Universidad de Oviedo)
    • Vocal: Ana Julia Escalada Aguado (ORONA)
    • Vocal: Irma Villar Iturbe (IKERLAN)
    • Secretary: Gaizka Ugalde Rosillo (Mondragon Unibertsitatea)

Abstract

Nowadays elevator manufacturers are trying to develop products with high comfort performance in order to fulfil current standards and to offer a high-quality product. Among the factors which decrease the travel quality are the vertical vibrations of the car. The source of these vibrations could be due to mechanical issues or due to the perturbations of the electrical machine. In this thesis, only the perturbations of the electrical machine are considered. 
 
On the other hand, the human body is very sensitive to vibrations of 2-20 Hz. Therefore, the main objective of the thesis is to eliminate the vertical vibrations of the car within this frequency range. 
Due to high uncertainties when comfort problems happen, in this thesis a procedure to identify the main perturbance sources regarding comfort problems for any low/medium speed installation (v<4m/s) is proposed. 
 
On the other hand, to achieve the main objective a detailed study about the effects of different aspects on the comfort is done: 
  • Manufacturing tolerances 
  • Eccentricity 
  • Different faults, like a partial demagnetization 
Once the study is done, a low perturbance machine design guide is proposed. However, it is impossible to completely reduce the machine perturbance only by design actions due to the high cost of employing materials and manufacturing processes with low tolerances. Hence, in some problematic installations, control actions for the elimination of the vertical vibrations of the car are necessary. Since having a competitive cost is a requirement, in this thesis two control solutions are presented without employing additional sensors.
 
The design aspects as well as the control solutions are checked experimentally in the laboratory. Additionally, the control actions are successfully validated in different elevator installations.