Design of a Single-DoF Prosthetic Hand With Practical Maximum Grip Force and Grasp Speed for ADLs Using Dual-Motor Actuator

Abstract

Sufficient grip force and appropriate grasp speed provided by a prosthetic hand are essential for daily use. However, due to limitations in size and weight, it is very challenging to select motors that can generate enough power to provide sufficient grip force and high grasp speed. Accordingly, this research proposes a new prosthetic hand design using a dual-motor actuator as an actuation strategy, which consists of two motors separated by a differential mechanism to operate at the load (high force) and no-load (high speed) conditions individually. One motor is used for creating a high torque and the other for creating a high speed, so the prosthetic hand can operate at the loads without using a high-power motor with excessive size and weight. The developed prosthetic hand can perform grasping motions with the following achievements: It can provide a maximum grip force of 80.2 N and maintain a maximum of 62 N with non-backdrivable mechanisms, and provide an average closing time of 1.2 s. Furthermore, the design can provide more grip force than research prosthetic hands using a single motor.

Design of a Multi-Mode Mechanical Finger Based on Linkage and Tendon Fusion Transmission

“…The grasping force is required to be higher during operation; the proper grasping force is the key to ensuring stability and reliability when grasping objects [ 21 , 22 ]. Therefore, based on the kinematics and statics analysis, we take the grasping force as the optimization target and use the genetic algorithm to optimize the finger mechanism parameters [ 23 , 24 , 25 , 26 ].…”

Symmetric Nonlinear Feedback Control and Machine Learning for Sustainable Spherical Motor Operation

“…Multiple-degree actuators are important components that are widely used in different industries and serve a wide range of applications, from robotic weapons to aerospace systems. Traditional actuators are usually used to connect pairs of a single degree of freedom motors using series or parallel configuration gears and connections [1][2][3][4]. However, these conventional actuators have several limitations, such as large size, high mass, a reduced positioning accuracy and workspace specificity.…”