Kyntronics SHA system offers precise servo control

Motion control/actuation specialist Kyntronics, Cleveland, OH, has developed its patent-pending SMART Hydraulic Actuator (SHA) which it says is a major development in “power-on-demand”, servo-controlled, variable-speed actuation. The technology combines the best advantages of hydraulics and electromechanical servo technology, minus their disadvantages, engineered in an all-in-one, scaleable, modular assembly.

Kyntronics says the SHA represents the world’s only standard, all-in-one (variable-speed motor, drive, cylinder) actuation system that precisely controls position, force and speed in applications requiring from 500 lb (2225N) to over 100,000 lb (445kN) of force capacity. With high force and quick cycle times in a compact package, the all-inclusive system produces strokes up to 120 in. (3048mm).

The company says that while traditional actuators have distinct advantages, each has inherent core disadvantages, such as: low reliability for electromechanical actuators, the energy inefficiency of hydraulic cylinder actuators and the infrastructure of leakprone pipes, fittings and valves in pneumatic systems.

The Kyntronics SHA is fully engineered as a standard modular product rendering it inherently more cost-effective as it uses standard, off-the-shelf components. This all-in-one system combines the key benefits of an electronic servo system with the power density of hydraulics. The flexible system can be oriented in any position and features a compact footprint, combining the power-to-weight ratio advantage of hydraulic technology with the versatility, ease of installation and control of electric servo technology.

A servo motor drives a hydraulic pump which generates pressure to act on a cylinder to provide optimal mechanical actuation force. A servo drive controller, actuator, manifold and builtin transducers provide essential closedloop precision force and position control. Fieldbus capabilities include Ethernet, CAN and Serial.

A benefit of the system is the way the differential volume is accounted for between a cylinder’s cap and rod ends. To compensate for this differential, the hydraulic cylinder includes an outer lowpressure cylinder with a second inner high-pressure cylinder, creating a chamber between the two.

Kyntronics says advantages of SHA systems include modularity, reliability and energy efficiency; no hydraulic infrastructure is required. As well, the small footprint/all-in-one drop-in package simply connects to power and input/output (or a network).

There are also a rod-volume compensation mechanism and a pre-engineered controller to reduce set-up time on site.

Amongst the applications possible for SHA systems are: actuators to control valves (pressure or position); lifting as needed; process roll positioning; roll presses (controlling pressure/force); slicing/cutting; material processing; opening/closing; clamping/gripping.


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