Paper Info
Title
Speed Ripple Reduction of Direct-Drive PMSM Servo System at Low-Speed Operation Using Virtual Cogging Torque Control Method
Abstract
In this article, a virtual cogging torque (VCT) control method to reduce the speed ripple of direct-drive permanent magnet synchronous machine servo system under low-speed conditions is proposed. Compared with other factors, at low speeds, the cogging torque is the main factor that deteriorates the drive performance, even induces speed oscillations. Especially in this article, due to volume limitation, the cogging torque is designed larger than normal one in order to remove the need of brake. Based on the model of permanent magnet synchronous motor, the cause and effect of the cogging torque are analyzed. Inspired by the characteristic of cogging torque, the VCT control method is proposed and investigated to significantly reduce the speed ripple at low speeds. The main idea of this proposed control method is to produce a proper VCT and continuously move the corresponding virtual stable equilibrium point to drive the rotor smoothly. In addition to the principle of this control method, its analysis and implementation are studied as well. Simulation and experimental results from the prototype demonstrate that the proposed control method is correct and valid, and it is simple and effective to smooth the speed at low-speed operations.
Year
DOI
Venue
2021
10.1109/TIE.2019.2962400
IEEE Transactions on Industrial Electronics
Keywords
DocType
Volume
Direct-drive servo system,low speed,permanent magnet synchronous machine,speed ripple,virtual cogging torque (VCT)
Journal
68
Issue
ISSN
Citations 
1
0278-0046
0
PageRank 
References 
Authors
0.34
0
7
Name
Order
Citations
PageRank
Feifei Bu183.71
Zhida Yang200.34
Yu Gao300.34
Zihao Pan400.34
Tianyu Pu500.34
Michele Degano6116.81
Chris Gerada714839.69