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PM synchronous machine drives

PM synchronous machine drives

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The purpose of this chapter is to discuss techniques for analyzing and controlling the electrical performance characteristics of permanent magnet (PM) synchronous machines (PMSMs) based on electrical equivalent circuit models for the machine derived in the synchronously rotating reference frame. Representation of the d- and q -axes components of the key machine variables as complex vectors provides a powerful means of graphically illustrating the amplitudes and spatial orientations of these key variables in the machine. This complex-plane representation of the machine-phase currents will be used to investigate the performance limits of the machine at high speeds when operating from a source that is restricted by maximum voltage and current limits.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 PM machine equivalent circuit models
  • 6.3 IPM machine torque production characteristics
  • 6.3.1 Basics of torque production in IPM machines
  • 6.3.2 PMSM torque production characteristics in dq current plane
  • 6.3.3 Current limit circle
  • 6.3.4 Impact of magnetic saturation on maximum torque-per-Amp trajectories
  • 6.4 Vector control of PM machine
  • 6.4.1 Review of basic vector control principles
  • 6.4.2 Application of vector control to SPM and IPM machines
  • 6.4.3 Introduction to self-sensing techniques for vector control drives
  • 6.5 IPM machine capability curves
  • 6.5.1 Basic principles
  • 6.5.2 PMSM circle diagrams and capability curves
  • 6.5.3 Three cases of PM machine capability curves
  • 6.5.3.1 Case 1: Ich>Imax
  • 6.5.3.2 Case 2: Ich = Imax
  • 6.5.3.3 Case 3: Ich<Imax
  • 6.5.3.4 High-speed capability curves for surface PM machines
  • 6.6 PM machine design space
  • 6.7 Flux-weakening control of PM machines
  • 6.7.1 Introduction to basic principles of flux-weakening control
  • 6.7.2 Feedforward vs. closed-loop flux-weakening control algorithms
  • 6.7.2.1 Feedforward flux-weakening control
  • 6.7.2.2 Closed-loop flux-weakening control
  • 6.7.3 Six-step voltage operation for flux-weakening algorithms
  • 6.8 Summary
  • List of symbols
  • Glossary of terms
  • References

Inspec keywords: permanent magnet motors; synchronous motor drives; machine control

Other keywords: permanent magnet synchronous machines; machine-phase currents; complex vectors; current limits; electrical equivalent circuit models; electrical performance characteristics; maximum voltage; complex-plane representation; synchronously rotating reference frame; PM synchronous machine drives; performance limits

Subjects: Synchronous machines; Control of electric power systems; Drives

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