Analysis and compensation control of passive rotation on a 6-DOF electrically driven Stewart platform
<p>With the development of motor control technology, the electrically driven Stewart platform (EDSP), equipped with a ball screw or lead screw, is being widely used as a motion simulator, end effector, and vibration isolator. The motor drives the lead screw on each driven branch chain to reali...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/8ff7cafe16c84ca48362bdbd0036ab16 |
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| Sumario: | <p>With the development of motor control technology, the
electrically driven Stewart platform (EDSP), equipped with a ball screw
or lead screw, is being widely used as a motion simulator, end effector, and
vibration isolator. The motor drives the lead screw on each driven branch
chain to realize 6-DOF motion of the moving platform. The control loop of
the EDSP adopts the rotor position as a feedback signal from the encoder or
resolver on the motor. When the moving platform of the EDSP performs
translational or rotational motion, the lead screw on each driven branch
chain passively generates a relative rotation between its screw and nut in
addition to its original sliding motion. This type of passive rotation (PR)
of the lead screw does not disturb the motor; hence, it cannot be
detected by the position sensor attached to the corresponding motor. Thus,
the driven branch chains cause unexpected length changes because of PR. As a
result, the PR generates posture errors on the moving platform during
operation. In our research, the PR on the EDSP was modeled and analyzed
according to the geometry configuration of EDSP. Then, a control method to
compensate for the posture errors caused by the PR was proposed. Finally,
the effectiveness of the analysis process and compensation control method
were validated; the improvement in pose accuracy was confirmed both by
simulation and experiments.</p> |
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