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Sensorless control of PMSM drives

Sensorless control of PMSM drives

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When compared to induction motors, permanent magnet synchronous motors (PMSMs) feature higher torque density, improved efficiency and increased constant power speed range. These distinct advantages have resulted in PMSMs being employed in a myriad of industrial applications. Traditionally, the open -loop V/f control scheme has been the preferred method for PMSM drives owing to its inherent simplicity. Nevertheless, as this method is derived from the steady-state model of the machine and does not rely on any motor feedback information, it offers very poor dynamic performance and is susceptible to external disturbances. Thus, its adoption is limited to applications whose transients are relatively unimportant or occur over long intervals. If high torque and speed dynamic performance is required, the vector control method becomes a necessity.

Chapter Contents:

  • 14.1 Introduction
  • 14.2 Mathematical model of the PMSM
  • 14.3 Open-loop back EMF estimator
  • 14.4 Closed-loop speed-adaptive observer
  • 14.5 Closed-loop speed non-adaptive observer
  • 14.6 HF signal injection
  • 14.7 Current slope measurement method
  • 14.8 Summary
  • List of symbols
  • Glossary of terms
  • References

Inspec keywords: permanent magnet motors; synchronous motors; voltage control; open loop systems; machine vector control; sensorless machine control; frequency control

Other keywords: vector control method; steady-state model; motor feedback information; permanent magnet synchronous motors; industrial applications; induction motors; PMSM drives; open-loop V-f control scheme; sensorless control

Subjects: Voltage control; Control of electric power systems; Synchronous machines; Frequency control

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