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On the Development of an SMA Based Rear Mirror Folding Actuator

[+] Author Affiliations
Alexander Czechowicz, Fabian Hoffmann, Sven Langbein, Peter Dültgen

Research Community for Materials and Tools r. assoc. (FGW e.V.), Remscheid, Germany

Romeo Wieczorek

SMR Automotive Mirrors Stuttgart GmbH, Stuttgart, Germany

Paper No. SMASIS2016-9119, pp. V001T04A005; 5 pages
doi:10.1115/SMASIS2016-9119
From:
  • ASME 2016 Conference on Smart Materials, Adaptive Structures and Intelligent Systems
  • Volume 1: Multifunctional Materials; Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Structural Health Monitoring
  • Stowe, Vermont, USA, September 28–30, 2016
  • Conference Sponsors: Aerospace Division
  • ISBN: 978-0-7918-5048-0
  • Copyright © 2016 by ASME

abstract

Nowadays electric motors are used for various applications in the automotive industry which affects the automobiles’ mass significantly. Small and medium sized electromotors are mainly used for comfort applications like locking systems or mirror folding drives. On the other hand, electromotor drives use often a reduction of a high speed rotation to a slow and powerful movement by the usage of gears. Due to the multistage gear ratio principle, such drives emit a noise level up which can be an inferiority attribute of an automotive system. Nevertheless, comfort applications are mainly driven by electromotor actuators in automobiles. Figure 1 shows a cut through a schematic side mirror of a car with two major electromotor drives comparable to the state of the art. The motor for mirror folding consists mainly of the complex gear box which has to fulfill a mirror movement of more than 65° in less than 5 seconds. To move the mirror with the motor has to have enough mechanical power to overcome this force and to move the mirror with a torque of more than 5 Nm.

Copyright © 2016 by ASME
Topics: Actuators , Mirrors

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