A Novel Flux-Weakening Control Strategy for Permanent-Magnet Actuator of Vacuum Circuit Breaker

Shuhua Fang, Qingdong Liu, Heyun Lin, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)


Traditional vacuum circuit breaker (CB) equipped with a bistable permanent-magnet (PM) actuator suffers from the disadvantages of having long start-up time and large current peak, and these shortcomings are limiting its applications on synchronization operation and high-voltage switchgear. In this paper, a new drive circuit which can significantly weaken the flux of the holding force with the usage of an auxiliary capacitor is proposed. In the proposed circuit, a negative current is circulated in the respective coil when the PM actuator is ready to switch on or off. Cosimulation which integrates the PM actuator and the circuit is carried out with the Maxwell and Simplorer software. The prototype is tested on the platform in conjunction with a 10-kV PM vacuum CB (VCB) to showcase the success of the proposed flux-weakening control strategy.
Original languageEnglish
Article number7328269
Pages (from-to)2275-2283
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - 1 Apr 2016


  • auxiliary capacitor
  • flux weakening control strategy
  • Permanent magnet actuator

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this