초록 ▼

A shape memory alloy (SMA) actuator for engaging and actuating a device. The actuator includes an engagement mechanism, a bias element, and a SMA object(s). The SMA actuator may automatically and passively transfer to a backup or redundant feature that resets or extends the actuator's operational li

A shape memory alloy (SMA) actuator for engaging and actuating a device. The actuator includes an engagement mechanism, a bias element, and a SMA object(s). The SMA actuator may automatically and passively transfer to a backup or redundant feature that resets or extends the actuator's operational life. In one embodiment, the SMA actuator includes an additional SMA object(s) that replaces the primary SMA object(s) in the event the primary SMA object(s) breaks. The SMA actuator may also be configured to apply a dynamic stress to the SMA object during transition of the object to modify the transition temperatures of the object. The SMA actuator may be part of a fluid distribution system, such as a heating, ventilation, and air conditioning (HVAC) system and used to control the flow of fluid, such as air, from the distribution system.

대표청구항 ▼

The invention claimed is: 1. A shape memory alloy actuator, comprising:a first shape memory alloy object and a second shape memory alloy object;a movable member to which the first shape memory alloy object and a second shape memory alloy object attach;the movable member being movable between a first

The invention claimed is: 1. A shape memory alloy actuator, comprising:a first shape memory alloy object and a second shape memory alloy object;a movable member to which the first shape memory alloy object and a second shape memory alloy object attach;the movable member being movable between a first position and a second position;a bias element attached to the movable member, wherein the bias element applies a stress to the first shape memory alloy object when the movable member is in the first position and applies a stress to the second shape memory alloy object when the movable member is in the second position, wherein in the first position the second shape memory alloy object is not subject to stress from the bias element and in the second position the first shape memory alloy object is not subject to stress from the bias element; andthe bias element is generally coaxial with the first shape memory alloy object when the movable member is in the first position and generally coaxially with the second shape memory alloy object when the movable member is in the second position.