No valves or variable-displacement pumps need control this electro-hydraulic actuator. Instead, a servomotor driving a fixed-displacement pump regulates the cylinder's flow, and therefore its speed.
Transistors, which switch 100,000 times faster than hydraulic valves, control the servomotor. They also exhibit linear characteristics that do not drift in time or temperature.
Finally, both servomotor and pump operate submerged in oil. Result: smaller motor/inertia requirements, no seals on rotating parts, less noise.
Rolf Truninger, Truninger AG, Industriestrasse 9, CH-4513 Langendorf, Switzerland; Tel: +41 32 617 3700, FAX: +41 32 617 3798, Visit: www.truninger.com.
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