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Field-weakening regime for brushless DC motors based on instantaneous power theory

Field-weakening regime for brushless DC motors based on instantaneous power theory

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  • Author(s): G.K. Miti 1 ; A.C. Renfrew 2 ; B.J. Chalmers 2
    • View affiliations
    • Affiliations: 1: Electrical Engineering Division, Wolfson Centre for Magnetics Technology, Cardiff University, Cardiff, United Kingdom
      2: Department of Electrical Engineering and Electronics, University of Manchester Institute of Science and Technology, Manchester, United Kingdom
  • Source: Volume 148, Issue 3, May 2001, p. 265 – 271
    DOI:  10.1049/ip-epa:20010264 , Print ISSN 1350-2352, Online ISSN 1359-7043
© IEE
Published

Permanent magnet excitation is beneficial in AC machines in which the flux is required to remain substantially constant. However in inverter-fed drives, where it is necessary to reduce the flux in order to operate above base speed with limited supply voltage, constant rotor excitation becomes a serious drawback. The conventional method used to achieve flux-weakening in permanent magnet motors involves phase advancing the stator currents with respect to the back EMF. The paper reviews the instantaneous power theory and investigates the use of the imaginary power component as an alternative means of providing field weakening in brushless DC motors. Apart from better performance at base speed, this regime is also shown to provide a wider speed range than the conventional method, without any significant current distortion.

Inspec keywords: stators; torque control; machine control; optimal control; brushless DC motors; magnetic flux; control system analysis; control system synthesis; permanent magnet machines; machine theory; rotors

Other keywords: imaginary power component; constant rotor excitation; permanent magnet excitation; stator currents; brushless DC motors; back EMF; speed range; inverter-fed drives; instantaneous power theory; base speed performance; field-weakening regime

Subjects: Control system analysis and synthesis methods; Control of electric power systems; Electric and magnetic fields; d.c. machines; Optimal control; Mechanical variables control

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