Axial transient vibration of polygonal mirror scanner motor supported by thrust magnetic bearing and radial air bearing

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    4 Citations (Scopus)

    Abstract

    This article describes an axial transient vibration of a polygonal mirror scanner rotor driven by a flat-type brushless DC motor and supported by a passive thrust magnetic bearing and a radial air bearing. From results of theoretical and experimental investigations, the following characteristics of the vibration, countermeasures to suppress a static displacement, and the transient vibration have been deduced: (1) Repulsive magnetic force is induced between the stator coils and rotor magnet under current passage. The force is proportional to the motor current. The force causes axial static displacement and axial transient vibration. (2) Parametric investigation deduced that: (a) higher stiffness of the magnetic bearing and lower acceleration current linearly reduce both the static displacement and the transient vibration; however, the former may reduce lifetime of the air bearing due to a dry contact with start and stop operation, and the latter prolongs the startup time; (b) soft start-stop scheme of the motor current is effective to reduce the vibration.

    Original languageEnglish
    Pages (from-to)484-491
    Number of pages8
    JournalJournal of Imaging Science and Technology
    Volume43
    Issue number5
    Publication statusPublished - 1999 Sep

    Fingerprint

    Bearings (structural)
    thrust bearings
    magnetic bearings
    Thrust bearings
    gas bearings
    Magnetic bearings
    scanners
    Mirrors
    mirrors
    vibration
    Air
    Rotors
    Brushless DC motors
    rotors
    Contacts (fluid mechanics)
    Stators
    Magnets
    countermeasures
    stators
    Stiffness

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Computer Vision and Pattern Recognition

    Cite this

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    title = "Axial transient vibration of polygonal mirror scanner motor supported by thrust magnetic bearing and radial air bearing",
    abstract = "This article describes an axial transient vibration of a polygonal mirror scanner rotor driven by a flat-type brushless DC motor and supported by a passive thrust magnetic bearing and a radial air bearing. From results of theoretical and experimental investigations, the following characteristics of the vibration, countermeasures to suppress a static displacement, and the transient vibration have been deduced: (1) Repulsive magnetic force is induced between the stator coils and rotor magnet under current passage. The force is proportional to the motor current. The force causes axial static displacement and axial transient vibration. (2) Parametric investigation deduced that: (a) higher stiffness of the magnetic bearing and lower acceleration current linearly reduce both the static displacement and the transient vibration; however, the former may reduce lifetime of the air bearing due to a dry contact with start and stop operation, and the latter prolongs the startup time; (b) soft start-stop scheme of the motor current is effective to reduce the vibration.",
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    N2 - This article describes an axial transient vibration of a polygonal mirror scanner rotor driven by a flat-type brushless DC motor and supported by a passive thrust magnetic bearing and a radial air bearing. From results of theoretical and experimental investigations, the following characteristics of the vibration, countermeasures to suppress a static displacement, and the transient vibration have been deduced: (1) Repulsive magnetic force is induced between the stator coils and rotor magnet under current passage. The force is proportional to the motor current. The force causes axial static displacement and axial transient vibration. (2) Parametric investigation deduced that: (a) higher stiffness of the magnetic bearing and lower acceleration current linearly reduce both the static displacement and the transient vibration; however, the former may reduce lifetime of the air bearing due to a dry contact with start and stop operation, and the latter prolongs the startup time; (b) soft start-stop scheme of the motor current is effective to reduce the vibration.

    AB - This article describes an axial transient vibration of a polygonal mirror scanner rotor driven by a flat-type brushless DC motor and supported by a passive thrust magnetic bearing and a radial air bearing. From results of theoretical and experimental investigations, the following characteristics of the vibration, countermeasures to suppress a static displacement, and the transient vibration have been deduced: (1) Repulsive magnetic force is induced between the stator coils and rotor magnet under current passage. The force is proportional to the motor current. The force causes axial static displacement and axial transient vibration. (2) Parametric investigation deduced that: (a) higher stiffness of the magnetic bearing and lower acceleration current linearly reduce both the static displacement and the transient vibration; however, the former may reduce lifetime of the air bearing due to a dry contact with start and stop operation, and the latter prolongs the startup time; (b) soft start-stop scheme of the motor current is effective to reduce the vibration.

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