Introducing the New FTP High Force Electric Actuator

GILBERT, AZ.February 1, 2018 – Curtiss-Wright’s Sensors & Controls Division today announced the release of its newest Exlar® brand electric actuator, the FTP215. This high-force electric rod-style press actuator is designed exclusively for press applications as it offers forces up to 36 tf, making it an ideal replacement for hydraulic cylinders.

The Exlar FTP Series actuator allows machine builders to meet ever-increasing performance demands, while minimizing maintenance and downtime.  Based on planetary roller screw technology, the FTP Series offers very high force in a very small package. With continuous force ratings to 36 tf (metric), 40 tf (short), speeds to 351 mm/sec (13.8 in/sec), and stroke lengths from 150 mm (6 inches) to 600 mm (24 inches), the FTP Series can be applied across a wide range of pressing applications.

The FTP215 features include: 

  • High capacity planetary roller screws offering up to 15X the life and significantly higher shock load resistance than a comparably sized ball screw
  • IP65S (min.) environmental protection
  • Idler pulley design greatly simplifies motor installation and belt tensioning / maintenance
  • Rigid circular front mounting flange simplifies installation

For more information on Curtiss-Wright’s Exlar brand of actuators, please visit http://www.cw-sensorsandcontrols.com or www.exlar.com.

About Curtiss-Wright Corporation

Curtiss-Wright Corporation (NYSE:CW) is a global innovative company that delivers highly engineered, critical function products and services to the commercial, industrial, defense and energy markets. Building on the heritage of Glenn Curtiss and the Wright brothers, Curtiss-Wright has a long tradition of providing reliable solutions through trusted customer relationships. The company employs approximately 8,000 people worldwide. For more information, visit www.curtisswright.com

Introducing the New GTX Integrated Motor / Actuator

GILBERT, AZ.February 15, 2018 – Curtiss-Wright’s Sensors & Controls Division today announced the release of the highly anticipated Exlar® GTX080 next-generation integrated motor/actuator. The GTX080’s latest design offers substantial performance improvements over its predecessor. Incorporating Curtiss-Wright’s patented inverted roller screw technology, the GTX080’s high power density and compact form factor make it an ideal replacement for hydraulic cylinders.

The GTX Series actuators offer the power, precision, and programmability of a servo system while minimizing the maintenance headaches and mess of hydraulics.  With continuous force ratings up to 5680 N (1277 lbf), speeds up to 4200 rpm, and stroke lengths from 100 mm (4 inches) to 450 mm (18 inches), the GTX080 can be applied across a wide range of factory automation applications.

The GTX Series features include: 

  • High capacity planetary roller screws offering up to 15X the life and significantly higher shock load resistance than a comparably sized ball screw
  • IP65S (min.) environmental protection
  • Seamless integration into most leading motion control architectures
  • Removable front seal bushing greatly simplifies maintenance and re-greasing of nut assembly to maximize actuator life
  • Modular design with bolt-on mounting hardware allows mounting style reconfiguration or replacement in the field using commonly available tools
  • Smoother, quieter operation compared to previous generation designs

For more information on Curtiss-Wright Sensors & Controls, please visit http://www.cw-sensorsandcontrols.com or https://exlar.com/.
About Curtiss-Wright Corporation

Curtiss-Wright Corporation (NYSE:CW) is a global innovative company that delivers highly engineered, critical function products and services to the commercial, industrial, defense and energy markets. Building on the heritage of Glenn Curtiss and the Wright brothers, Curtiss-Wright has a long tradition of providing reliable solutions through trusted customer relationships. The company employs approximately 8,600 people worldwide. For more information, visit www.curtisswright.com.

Introducing our Newest Fully Integrated Drive/Motor/Actuator, the TTX Series

GILBERT, AZ. – February 15, 2018 – Curtiss-Wright’s Sensors & Controls Division today announced the release of the Exlar® TTX080, our newly designed fully integrated drive/motor/actuator. Utilizing the all-new GTX Series base actuator as a foundation, the TTX080 adds the control and drive electronics necessary to allow stand-alone operation, making it an ideal retrofit for hydraulic cylinders on existing machinery.

The TTX Series actuators offer the power, precision, and programmability of a servo system while minimizing the maintenance headaches and mess of hydraulics. With continuous force ratings up to 11.9 kN (2,687 lbf), speeds up to 953 mm/sec (37.5 in/sec), and stroke lengths from 100 mm (4 inches) to 450 mm (18 inches), the TTX080 can be applied across a wide range of factory automation applications.

The TTX Series features include:

• Servo control, drive, and motor integrated with a compact, power-dense actuator
• High capacity planetary roller screws offering up to 15X the life and significantly higher shock load resistance than a comparably sized ball screw
• IP65S (min.) environmental protection
• Removable front seal bushing greatly simplifies maintenance and re-greasing of nut assembly to maximize actuator life
• Modular design with bolt-on mounting hardware allows mounting style reconfiguration or replacement in the field using commonly available tools
• Smoother, quieter operation compared to previous generation designs

For more information on Curtiss-Wright Sensors & Controls, please visit
http://www.cw-sensorsandcontrols.com or https://exlar.com/.

About Curtiss-Wright Corporation
Curtiss-Wright Corporation (NYSE:CW) is a global innovative company that delivers highly engineered, critical function products and services to the commercial, industrial, defense and energy markets. Building on the heritage of Glenn Curtiss and the Wright brothers, Curtiss-Wright has a long tradition of providing reliable solutions through trusted customer relationships. The company employs approximately 8,600 people worldwide. For more information, visit
www.curtisswright.com.

Actuator De-rating for Elevated Ambient Temperatures

It is important to consider the environment temperature when sizing your actuator if it is hotter than standard room temperature (25°C or 77°F). A motor (or integrated linear actuator) has two ratings – continuous force and peak force. The continuous force rating is the force at which the actuator could push 100% of the time without its motor overheating. The peak force is the absolute max force either the stator can produce or the screw can handle (whichever limits first). If your temperature is hotter than 25°C however, the actuator would overheat faster – meaning it would need to be limited to less force in order to run 100% of the time without its motor overheating. So how do we determine the new force rating if the environment is really hot? With this equation:

The answer is in terms of a percentage of the catalog rated continuous force.

Example:

Let’s say your environment is at 150°F and you’re using a GSX50-1010, 2-stack. The actuator has a continuous force rating of 1005 lbf, meaning at room temperature it could push 1005 lbf continuously without overheating. But you’re not operating at room temperature. You’re operating at 150°F.So first, let’s convert to Celsius:

150°F = 65.56°C

Then let’s plug it into the equation:

This means you’re now limited to 78.3% of the original 1005 lbf rating. So 78.3% of 1005 lbf is 787 lbf. Your drive must now be programmed to limit to the current that is equivalent to this force if it were to be run continuously.

*You could still run at more current/force than this for a percentage of the time, just not 100%. For help calculating your allowed percentage based on run time, see our Duty Cycle Tech Tip of the Month or check out our frequently asked questions section of our website.

**Remember, this applies to actuators with motors in them, not stand-alone actuators. The calculation above still needs to be run for the motors controlling these actuators, and those motors still need to be limited if necessary, but the stand-alone (universal) actuators ratings are their rating regardless of temperature. i.e.: An FTX095 could push 5000 lbf at 25° C or 85° C as long as the motor could handle it.

How to lengthen the life of your actuator

Because roller screws have numerous contact points versus ball screws, the life of the actuators lengthen substantially. However, many things will affect the length of life for a roller screw. Here are some tips to increase roller screw life:

  • Eliminate/mitigate side load/misalignment
  • Reduce (or ideally, eliminate) hard impacts/shock loads
  • No end crashing or hard stops. Bumpers are there for accidents only (use nice and controlled deceleration)
  • Switch up the portion of the screw being used for press applications (evenly distribute the wear)
  • Make sure wear parts are replaced as necessary (Front seal bushings and other seals/o-rings etc)

Electrical Systems Special Report (2015)

This four-page article touches on the good, the bad, and the ugly of legacy vs modern electrical systems. Included topics are:

  • Electric actuators and valve control
  • Motor technology breakdown
  • Mechanical powertrain options
  • Ideal ball and roller screw applications

What is the best approach for your electrical system?

For more details, check it out here!

Tech Tip – Force Tube Parallel Motor Mount Assembly

The Exlar® FT Series actuators combined with a parallel motor mounting configuration use a polymer reinforced belt drive system. The drive train does not require any lubrication and any oil or dirt contamination within the belt drive system will decrease belt effectiveness and life. The belt and pulley system should be inspected periodically for excessive wear and proper tensioning.

Do not remove the belt cover while the actuator is operating. Always remove power from the attached motor before removing the belt cover to service any component of the drive train (i.e. belts, pulleys, bushings, inline couplings, gears, etc). Failure to do so can result in damage to the actuator or cause serious injury to the operator.

The following picture is only an example of a typical belt and pulley drive train in an FT Series actuator.

Proper-Belt-Tension Belt-Tension-Diagram

These belt drives do not require as much tension as other belt drives that depend on friction to transmit the load. The installation procedure should begin by installing the belt with a snug fit, neither too tight nor too loose. Now, measure the belt span, (t), as shown in the picture above. With one pulley free to rotate, use a spring scale to apply a perpendicular force to the center of the belt width at the mid-point of the belt span. For belts wider than 2”, it is suggested that a strip of keystock, or something similar be placed across the belt under the point of force to prevent distortion. Measure the deflection of the belt at the mid-point. While applying the correct force, there should be 1/64” of deflection for each inch of belt span. For example, the total deflection for a 32” belt span is 32”*1/64” = ½”. The appropriate amount of force for each belt is shown on the customer approval drawing, or you may contact our application engineer team for assistance.