'Smart fluid' & technology enables motion control

Cary, N.C.—Pneumatic motion control has received a boost from a novel development by Lord Corp. which it calls Rheonetic technology. The design consists of braking devices, containing magnetorheological (MR) fluids, placed functionally in parallel with standard pneumatic actuators. Closed-loop feedback from a position sensor makes possible the accurate, robust motion control.

06/01/1999


Cary, N.C.—Pneumatic motion control has received a boost from a novel development by Lord Corp. which it calls Rheonetic technology. The design consists of braking devices, containing magnetorheological (MR) fluids, placed functionally in parallel with standard pneumatic actuators. Closed-loop feedback from a position sensor makes possible the accurate, robust motion control. MR fluids have the ability to rapidly change consistency from fluid to near solid when exposed to a magnetic field. Variable force/control can be obtained by changing the fluid's apparent viscosity under a varying magnetic field. Magnetorheological fluid technology answers limitations of compliance, complexity, and sensitivity to friction and air quality of standard pneumatic motion systems.

In one product version, linear controllable MR fluid brakes are clamped in parallel with an air cylinder. A controller commands a directional solenoid valve and the MR fluid brakes to allow tracking of complex position and velocity profiles, says Lord. Features of this light-duty actuator include strokes up to 24 in. and thrust range of 16-32 lb (at 20-40 psi operating pressure).

A second implementation couples a rotary MR fluid brake to the linear output of an air cylinder via a rack-and-pinion device. This higher capacity actuator offers strokes up to 16 in. and 85 lb maximum thrust (at 120 psi). For an 11-lb payload and 80 psi operation, typical positioning accuracy of 0.020 in. is available at 10 in./sec average speed. Accuracies increase with lower positioning speeds.

Lord Corp., Materials Div.





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Make Big Data and Industrial Internet of Things work for you, 2017 Engineers' Choice Finalists, Avoid control design pitfalls, Managing IIoT processes
Engineering Leaders Under 40; System integration improving packaging operation; Process sensing; PID velocity; Cybersecurity and functional safety
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
click me