Influence of Stator Slot and Rotor Pole Number Combination on Field Winding Induced Voltage Ripple in Hybrid Excitation Switched Flux Machine

Xiaoyong Sun, Ziqiang Zhu, Shun Cai, Lu Wang, Fangrui Wei, Bo Shao

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The induced voltage ripple in DC field windings can cause many problems in hybrid excitation machines (HEMs). It can generate ripple current in field winding, thus causing unsteady magnetic field excitation and hence additional torque ripple and losses. Besides, the torque and power density of hybrid excitation machines may be deteriorated as a result of the influence of the induced voltage ripple on field winding's excitation circuit, particularly under high-speed conditions. Based on a hybrid excitation switched flux machine (HESFM), the influence of stator slot and rotor pole number combination on no-load and on-load field winding induced voltage ripples are studied and compared by the finite element method (FEM). It reveals that the harmonic content and thus the peak-to-peak value of the field winding induced voltage ripple are closely related to the stator slot and rotor pole number combination at both no-load and on-load operating conditions. The FEM calculations are verified by experiments on a prototype HESFM.
Original languageEnglish
Article number9246687
Pages (from-to)1245-1261
Number of pages17
JournalIEEE Transactions on Energy Conversion
Volume36
Issue number2
Early online date2 Nov 2020
DOIs
Publication statusPublished - Jun 2021
Externally publishedYes

Keywords

  • field winding
  • hybrid excitation machine
  • induced voltage ripple
  • permanent magnet
  • slot and pole number combination
  • switched flux

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