Influence of the PWM frequency on dynamic and position stability of servo drives

Julia Hollthaler, Rainer Hagl, Ralph Kennel

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The dynamic behavior and position stability of servo drives are influenced by many parameters. One major influencing parameter is the pulse width modulation (PWM) frequency. With inverters based on wide bandgap semiconductors, the PWM frequency can be increased. This enables a substantial increase in the current control bandwidth. The paper focuses on the influence of the PWM frequency on the dynamics of control loops and position stability, which are derived from theoretical correlations. The theory is verified using a test bench for high dynamic and position stability. The test bench is equipped with a voice coil motor and power electronic with gallium nitride (GaN) power semiconductors for switching frequencies of 100 kHz and over. The achieved position stability, measured with a laser-based comparator at the tool center point, is lower than ±1 nm with a standard deviation of 0.16 nm at a PWM frequency of fPWM100 kHz.

Original languageEnglish
Title of host publication2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages23-29
Number of pages7
ISBN (Electronic)9781728170190
DOIs
StatePublished - Jun 2020
Event2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020 - Sorrento, Italy
Duration: 24 Jun 202026 Jun 2020

Publication series

Name2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020

Conference

Conference2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM 2020
Country/TerritoryItaly
CitySorrento
Period24/06/2026/06/20

Keywords

  • Bandwidth
  • FPGA
  • GaN power semiconductors
  • Position control
  • Position stability

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