Injection system combines electric and hydraulic technologies

March 20, 2003
Hydraulically powered injection units are known for power, speed, and accuracy. Electric units cannot match the higher forces of their hydraulic counterparts but are recognized for their modular designs, which are easier to maintain, cleaner, and offer greater energy efficiency.

The new Powershot injection system from Moog Inc., East Aurora, N.Y. (www.moog.com), combines hydraulic and electric technologies to get the best of each. It is a sealed, closed-loop hydraulic actuator that requires no external power unit. A servoproportional valve and accumulator provide closed-loop control of injection and decompression. A servomotor, or frequency drive, controls rotation of the plasticizing screw. The radial piston pump handles closed-loop control of backpressure and recharges the accumulator for the next cycle. Unlike pure hydraulic systems, the main servomotor and radial pump are only turned on when needed during recovery, which reduces energy consumption.

The Moog Servo Controller System works with the customers' controller through a fieldbus. The compact unit can be installed with just a few connections, offering plug-and-play convenience.

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