Super lightweight actuator


One of the problems faced by companies is the shortage of manpower to meet the diversifying needs of their customers. As a solution, there are growing expectations for collaborative robots that can operate without safety fences. Collaborative robots are easy to introduce and install, and can respond flexibly to various types and quantities. However, the current high payload collaborative robots are too heavy to be easily transported. There is a need for a high payload and lighteweight collaborative robot.

Research Objective

This study aims to reduce the weight of the embedded magnet synchronous motor (IPMSM), which is one of the components of the collaborative robot. Previous research on lightweight motors has not attempted to reduce weight by focusing on the structure of the IPMSM. The objective of this study is to design the rotor structure of a lightweight IPMSM.


To design a lightweight rotor structure using optimization. The optimization is performed using a model based on the D model of IEE. A lightweight structure of the rotor electromagnetic steel plate is obtained by optimization.


Compared to the D model, a structure with the same average torque but reduced mass was obtained.