The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2016
Filed:
Feb. 26, 2015
GM Global Technology Operations Llc, Detroit, MI (US);
The Regents of the University of Michigan, Ann Arbor, MI (US);
Paul W. Alexander, Ypsilanti, MI (US);
Nancy L. Johnson, Northville, MI (US);
Jonathan E. Luntz, Ann Arbor, MI (US);
Diann Brei, Milford, MI (US);
Clover Thebolt, Ann Arbor, MI (US);
Brent Utter, Ann Arbor, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
The Regents of the University of Michigan, Ann Arbor, MI (US);
Abstract
A system for controlling motion of a shape memory alloy (SMA) actuator includes a damper operatively connectable to the SMA actuator and having a movable portion that moves with the SMA actuator when the SMA actuator contracts during electrical activation. An electronic switch is operatively connectable to the SMA actuator and to the damper. The electronic switch has an open position preventing electrical power flow to the SMA actuator, and a closed position permitting electrical power flow to the SMA actuator. A biasing element applies a biasing force that urges the electronic switch to the closed position. The damper overcomes the biasing element to move the switch to the open position only when velocity of the movable portion equals or exceeds a predetermined threshold velocity, and to return to the closed position when the velocity of the movable portion falls below the predetermined threshold velocity.