High-power synchronous machine drives

High-power synchronous machine drives

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In this chapter, high power synchronous motor drives will be addressed. First of all, an overview will be provided of the main technologies and design features which characterize large synchronous machines and the relevant supplying converters, also taking into due account their field of application. Subsequently, the attention will be placed on the major strategies intended to improve high-power synchronous machine drives fault tolerance, acting on the system-level drive architecture as well as on the design and operation of the individual components (electric motor, converter, control system). Finally, the main diagnostics and condition monitoring techniques for high-power synchronous motor drives will be covered, describing the main methods to detect possible malfunctioning, anomalies and faults in drive operation before they result in serious damages or hazards.

Chapter Contents:

  • 4.1 High-power synchronous motors
  • 4.1.1 Permanent magnet motors
  • Rotor design
  • Stator design
  • Bearings
  • 4.1.2 Wound-field synchronous motors
  • Rotor design
  • Stator design
  • Rotor excitation system
  • Bearings
  • 4.2 High-power converters
  • 4.2.1 Voltage source inverters
  • Front-end or AC/DC rectifier stage
  • Multi-level voltage output
  • Inverter topologies
  • Control features
  • 4.2.2 Current source inverters
  • Self-commutated CSI
  • Load-commutated inverter
  • 4.2.3 Cycloconverters
  • 4.3 System-level fault-tolerant drive architectures
  • 4.3.1 Redundant drive architectures
  • Multi-motor redundant configurations
  • Single-motor design configurations
  • 4.3.2 Multi-phase drive architectures
  • Symmetrical multi-phase architectures
  • Asymmetrical multi-phase architectures
  • Multi-three-phase architectures with in-phase three-phase sections
  • 4.4 Fault-tolerant electric motor design
  • 4.4.1 Fault-tolerant solutions in the stator design
  • Distributed vs concentrated stator windings
  • Design for improving machine resilience to eccentricity faults
  • 4.4.2 Fault-tolerant solutions for the rotor design
  • Wound-field synchronous motors
  • Permanent magnet motors
  • 4.5 Fault-tolerant power converter design
  • 4.5.1 Fault-tolerant VSIs
  • NPC VSIs
  • FC VSIs
  • 4.5.2 Fault-tolerant CSIs
  • SCR short-circuit fault
  • SCR open-circuit fault in a line-side converter
  • SCR open-circuit fault in a motor-side converter
  • 4.6 Diagnostics
  • 4.6.1 Diagnostics in medium-voltage converters
  • Fault detection in VSI-based converters
  • Fault detection in CSI-based converters
  • 4.6.2 Diagnostics in large synchronous motors
  • Journal bearings fault detection
  • Rotating rectifier fault detection
  • Field winding fault detection
  • Rotor eccentricity detection
  • Stator winding insulation condition monitoring
  • Acknowledgment
  • References

Inspec keywords: fault diagnosis; synchronous motor drives; power convertors; condition monitoring; fault tolerance

Other keywords: diagnostics techniques; large synchronous machines; condition monitoring techniques; fault tolerance; motor drives; control system; anomalies detection; malfunctioning detection; electric motor; faults detection; high-power synchronous machine drives; converters

Subjects: Drives; Power convertors and power supplies to apparatus; Synchronous machines

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