MOTION SYSTEM APPLICATIONS
Applications for Electric actuators
ELECTRIC
actuators come in versions as small as syringes for medical applications to those big enough to drive industrial presses. These muscles of precision motion usually incorporate an electric motor and rotary-to-linear device for conversion of torque to linear force. No matter the application, electric actuators deliver repeatability that’s indispensable for moving loads to a given positions. Often they’re also more controllable than fluid-power actuators,
6
DESIGN WORLD — MOTION
giving engineers a way to shape speed, force and acceleration of machine-axis moves. Another benefit for applications that need multiple outputs over time is that most electric actuators are programmable so adapt to changing conditions. Applications with similar dynamics often make use of the same actuator types — those that pair motors with ballscrews or leadscrews; incorporate brushless dc motors and beltand-pulley setups; take a rod-style morphology; use motors with planetary roller screws; or integrate built-in guides. Electric actuators running closed-loop or with a micro-stepping motor can match force and speed output commands best with feedback to overcome most of the mechanical limitations of rotary-to-linear devices. Some application tips: Establish the design’s power draw and determine whether the machine will draw power continuously or intermittently or both, as that ultimately
11 • 2020
motioncontroltips.com
|
designworldonline.com
