Performance analysis of the 2DoF direct drive induction motor applying composite multilayer method

Jikai Si*, Lujia Xie, Wenping Cao, Yihua Hu, Haichao Feng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study presents a composite multilayer method (CMM) to evaluate the performance of a two-degree-offreedom (2DoF) direct drive induction motor (2DoFDDIM) whose solid rotor is coated with a copper layer. It includes a rotary part and a linear part. Based on the traditional multilayer theory, a complete 2DoFDDIM CMM computer program importing propagation constants is built. Due to the complex magnetic field in a 2DoFDDIM, this study mainly analyses it from the perspective of a single DOF motor. An equivalent circuit for the rotary part of the 2DoFDDIM is then derived applying CMM and the 2D magnetic field distribution is obtained by solving Maxwell's equations in motor layers. The developed torques, power factors and stator currents of the rotary part with different slips and the latter two of the linear part at zero speed are calculated by CMM, which are then compared with results from the finite element method (FEM) and experimental results. The computation time of the CMM is far less than that of the FEM. The acceptable accuracy confirms the effectiveness of the CMM for analysis and performance calculations of the 2DoFDDIM.

Original languageEnglish
Pages (from-to)524-531
Number of pages8
JournalIET Electric Power Applications
Issue number4
Publication statusPublished - 1 Apr 2017

Bibliographical note

This paper is a postprint of a paper submitted to and accepted by IET Electric Power Applications and it is subject to Institution of Engineering and Technology Copyright.The copy of record is available at the IET Digital Library.


Dive into the research topics of 'Performance analysis of the 2DoF direct drive induction motor applying composite multilayer method'. Together they form a unique fingerprint.

Cite this