Selection guidance of electrical actuation with different gearheads for power-off load latching

Abstract

The actuator serves as a motion converter, helps transform the speed and direction of motion, and is a motion controller for precise positioning. The actuator facilitates automated movement and is pivotal in determining the machine's performance. Engineers must consider three factors when choosing an actuator: the motor capacity, the reduction ratio of the gearbox, and an encoder. Electro-mechanical actuators fulfill various functions, including precise component positioning, maintaining desired positions, providing ample force or torque for securing closure mechanisms, and enabling controlled acceleration and deceleration at specified speeds. While on power, they excel at holding the desired position, but under off-power conditions, they also securely hold the load in place with less energy consumption. The main objective is to choose an ideal motor and gearhead combination for effectively holding the load when the power is off. This selection process considers crucial factors like output torque, speed, peak power, mass, and size. The research involves a comparative analysis between power-on load holding and power-off load holding in terms of consumed power, control circuitry, stability, and cost. Analytical calculations for finding the optimal motor torque and gearhead (gearbox) are conducted, and a Simscape Multibody simulation of a pendulum system is performed for validation purposes. This study helps select a suitable motor gearhead combination for power-off load holding by comparing the calculated values with simulation results. The method presented here is universally applicable to different types of loads, providing a valuable tool for selecting the most appropriate motor gearhead combination.