Electric linear actuators incorporate force measurement

Inmocovisit website


Inmoco is extending the capabilities of its high-torque, long-life Exlar GSX and I ranges of electric linear actuators with the introduction of an integral force measuring capability in the form of a load cell embedded within the actuator. This option offers a direct method for obtaining electronic data relating to the force being applied by the actuator. Moreover, the packaging of the load cell delivers a compact, protected robust design, with the strain gauge load sensors embedded within the actuator housing.

The integrated load cell option is available on Exlar’s GSX30, 40 and 50 models, and the I series 30 and 40 model actuators. The load cell offers stable and accurate load sensing (+/-1 per cent linearity, +/-0.5 per cent repeatability and hysteresis, 1 per cent nominal) in both directions and for static or dynamic loads.

Supplied as a package, the force measuring option has a separate fitting for connecting the internal load sensor to an external strain conditioner/amplifier required to excite the strain gauge sensor. In addition, Exlar offers a rugged strain gauge conditioner to provide a high-level signal, either 0-10V or 4-20mA output, for monitoring the output signal - which, importantly, is compatible with standard gauge monitors and PLC strain gauge input cards. Alternatively, any of numerous conditioners/amplifiers on the market can be used.

Reliable alternative to hydraulics

The GSX and I series actuators on which the force measuring option is available both employ Exlar’s roller screw technology. For the last 15 years this has been the integral component in creating reliable, long-lasting electromechanical actuators, providing a long-life, all-electric replacement for hydraulic cylinders in thousands of applications.

GSX actuators also benefit from Exlar’s T-LAM technology, a new, segmented lamination stator design that is claimed to enable 35 per cent more continuous motor torque to be provided from the same frame sizes as competitive actuators, with no cost premium. The brushless servo design of the GSX series linear actuators enables them to be used in state-of-the-art closed-loop servo systems where electronic control of positioning and velocity is required.

The robustness, precision and reliability of the GSX and I series actuators mean that they are suitable for many demanding applications including fastening and joining, riveting, bag sealing, thermoforming, injection moulding, precision pressing, clamping, tension control, welding, tube bending, wire winding, dispensing, testing, filling – and many more.

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