Title:
形状記憶合金作動構造の制御
Document Type and Number:
Japanese Patent JP5221672
Kind Code:
B2
Abstract:
An SMA actuation arrangement comprises: an SMA actuator arranged on contraction caused by heating to drive movement of a movable element relative to a support structure; a current source operative to supply drive current through the SMA actuator to heat the SMA actuator; and a detector circuit operative to detect a measure of the resistance of the SMA actuator. While detecting a measure of the resistance of the SMA actuator and controlling the drive current on the basis of the measure of the resistance of the SMA actuator; there is derived a measure of an electrical characteristic of the SMA actuator that is representative of the ambient temperature. While applying closed-loop control an offset is added to the control signal which reduces the steady-state value of an error between the measure of the resistance of the SMA actuator and a target value. While applying open-loop control, the control signal is generated taking into account the electrical characteristics of the SMA actuator measured during a calibration stage.
Inventors:
Top squirrel, richard
Reedham, Robert, John
Richard, David, Charles, William
Gregory, Thomas, Mash
Reedham, Robert, John
Richard, David, Charles, William
Gregory, Thomas, Mash
Application Number:
JP2010536526A
Publication Date:
June 26, 2013
Filing Date:
December 03, 2008
Export Citation:
Assignee:
Cambridge Mechatronics Limited
International Classes:
F03G7/06; G02B7/04; G02B7/08
Domestic Patent References:
| JP2006009795A | ||||
| JP2672110B2 | ||||
| JP2006329146A | ||||
| JP6230457A | ||||
| JP2007512597A |
Attorney, Agent or Firm:
Hiroshi Kobayashi
Eiji Katayama
Norio Omori
Yasuhito Suzuki
Eiji Katayama
Norio Omori
Yasuhito Suzuki