Manipulation of Thin Objects Using Levitation Techniques, Tilt Control, and Haptics
Identifieur interne : 000E50 ( PascalFrancis/Curation ); précédent : 000E49; suivant : 000E51Manipulation of Thin Objects Using Levitation Techniques, Tilt Control, and Haptics
Auteurs : Ewoud Van West [Japon] ; Akio Yamamoto [Japon] ; Toshiro Higuchi [Japon]Source :
- IEEE transactions on automation science and engineering [ 1545-5955 ] ; 2010.
Descripteurs français
- Pascal (Inist)
- Manipulation, Lévitation électrostatique, Inclinaison, Dispositif magnétique, Commande accélération, Boucle anticipation, Synthèse commande, Angle inclinaison, Sensibilité tactile, Force électrostatique, Lévitation magnétique, Suspension magnétique, Entrefer, Système n degrés liberté, Moteur électrique, Système actif, Commande mouvement, Champ électrique, Admittance, Silicium, ..
English descriptors
- KwdEn :
- Acceleration control, Active system, Admittance, Air gap, Control synthesis, Electric field, Electric motor, Electrostatic force, Electrostatical levitation, Feedforward, Magnetic device, Magnetic levitation, Magnetic suspension, Manipulation, Motion control, Silicon, System with n degrees of freedom, Tactile sensitivity, Tilt, Tilt angle.
Abstract
Levitation techniques allow delicate objects, such as silicon wafers, to be manipulated without contact. In case of electrostatic and magnetic levitation, the object can be levitated by actively controlling the electric/magnetic field based on the measured air gap between the object and the levitator. Multiple degrees of freedom are controlled by several electric/magnetic actuators. For thin flat objects, the surface area is large enough for suspending the object in vertical direction, but the side surface is too small to realize active control for lateral motions. For stability, the levitation system relies on a passive lateral restoring force that will keep the object aligned with the levitator. The drawback of this passive force is that it is far weaker than the controlled suspension force. As a result, allowable accelerations in the horizontal plane have to be limited in a manipulation task to prevent loosing the object during motion. In this paper, a solution is proposed based on compensating the acceleration by Tilt Control. For both an electrostatic and a magnetic levitation system, the significant improvement of tolerance to lateral acceleration due to feedforward tilt control is presented. It is shown that not only for automated motion but also for human operated motion, the tilt control strategy is applicable. In the human operated motion, haptic technology such as the admittance control scheme, are used to realize satisfactory manipulation. Note to Practitioners-When levitation systems are used for transporting objects without contact, there is a practical problem that objects may be lost (dropped) if planar accelerations are too high, because the lateral holding force in these systems is very weak. This paper proposes a solution in which the object and its levitator are tilted so that a part of the stronger levitation force is also used to compensate for these planar accelerations. Tilting angles are realized directly based on the acceleration of the moving actuator, so that measurement of the relative lateral position with a feedback tilt control is not necessary. While it increases the complexity of the levitator since a tilting mechanism is needed, fast noncontact manipulation can be realized.
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<front><div type="abstract" xml:lang="en">Levitation techniques allow delicate objects, such as silicon wafers, to be manipulated without contact. In case of electrostatic and magnetic levitation, the object can be levitated by actively controlling the electric/magnetic field based on the measured air gap between the object and the levitator. Multiple degrees of freedom are controlled by several electric/magnetic actuators. For thin flat objects, the surface area is large enough for suspending the object in vertical direction, but the side surface is too small to realize active control for lateral motions. For stability, the levitation system relies on a passive lateral restoring force that will keep the object aligned with the levitator. The drawback of this passive force is that it is far weaker than the controlled suspension force. As a result, allowable accelerations in the horizontal plane have to be limited in a manipulation task to prevent loosing the object during motion. In this paper, a solution is proposed based on compensating the acceleration by Tilt Control. For both an electrostatic and a magnetic levitation system, the significant improvement of tolerance to lateral acceleration due to feedforward tilt control is presented. It is shown that not only for automated motion but also for human operated motion, the tilt control strategy is applicable. In the human operated motion, haptic technology such as the admittance control scheme, are used to realize satisfactory manipulation. Note to Practitioners-When levitation systems are used for transporting objects without contact, there is a practical problem that objects may be lost (dropped) if planar accelerations are too high, because the lateral holding force in these systems is very weak. This paper proposes a solution in which the object and its levitator are tilted so that a part of the stronger levitation force is also used to compensate for these planar accelerations. Tilting angles are realized directly based on the acceleration of the moving actuator, so that measurement of the relative lateral position with a feedback tilt control is not necessary. While it increases the complexity of the levitator since a tilting mechanism is needed, fast noncontact manipulation can be realized.</div>
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{{Explor lien |wiki= Ticri/CIDE |area= HapticV1 |flux= PascalFrancis |étape= Curation |type= RBID |clé= Pascal:11-0092833 |texte= Manipulation of Thin Objects Using Levitation Techniques, Tilt Control, and Haptics }}
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