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Electric-cylinder advances

Time:2021-5-13 16:48:05    Views:

More machine builders are moving away from hydraulics and pneumatics in favor of more versatile electromechanical solutions. This has encouraged manufacturers to further improve the load-handling capability and accuracy of their products, while making them smaller and easier to size and install. Manufacturers generally offer several basic models to cover a wide range of thrusts with options such as rod ends, mounting supports, linear potentiometers, and environmentaloriented options. The options let machine designers choose the cylinder that fits in their machine, rather than designing the machine around the cylinder.

Electric cylinders generate the highest thrust among the various types of electromechanical linear actuators. This is because the thrust tube is directly in line with the screw and nut. Some cylinders can handle high loads which rival the capabilities of hydraulic actuators. Although at high thrust ranges, hydraulics tend to be more cost effective.

The most common applications for electric cylinders are in the range of 6,000 lb or less. Electric cylinders also combine high speed with high accuracy, repeatability, and reliability. Maximum speeds can be as high as 50 in./sec and controlled accurately.

Cylinders are usually driven by stepper motors, servomotors, and dc motors. Each has benefits. Selecting one depends on the load, duty cycle, repeatability, and flexibility requirements. The cylinders' accuracy and repeatability depend on the mechanics and motor. Repeatability can be as low as ±0.0005 in. Controls for electric cylinders range from simple pushbuttons to more complex programmable multiaxis motion controllers. These can interface easily to a variety of operator and machine interfaces such as simple manual thumbwheel switches or more sophisticated programmable-logic controllers and personal computers. This control flexibility gives designers a wide choice, allowing them to weigh the cost and benefits of each solution.


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