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Switched reluctance machine drives

Switched reluctance machine drives

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Switched reluctance machine drives present a unique ability for fault-tolerant applications due to a high level of electric and magnetic independence between motor phases. This feature allows the machine to keep running with a high degree of safety and low-performance degradation, when a fault occurs in one or more phases. A fault in one of the system phases, either a motor winding fault or a power converter switch fault, can be detected and isolated without causing harmful effects in the other phases. Performance degradation is, of course, proportional to the number of faulty phases. Therefore, fault diagnosis is essential to isolate the fault and promote control and/or hardware reconfigurations to achieve a better performance. In this chapter, the following issues will be addressed: Overall characteristics of switched reluctance motor (SRM) drives; Comprehensive SRM drives fault analysis; Description of suitable diagnostic techniques oriented to machine faults and/or power converter faults; Analysis of diagnostic techniques for open- and/or short-circuit fault detection in power switches that provide faulty element identification;Post-fault reconfiguration strategies based on control reconfiguration and/or hardware reconfiguration.

Chapter Contents:

  • 3.1 The switched reluctance motor
  • 3.1.1 Performance analysis
  • 3.2 Switched reluctance motor operation
  • 3.2.1 Single pulse operation
  • 3.2.2 Voltage chopping
  • 3.2.2.1 Soft chopping
  • 3.2.2.2 Hard chopping
  • 3.3 Control of switched reluctance machine drives
  • 3.4 Fault analysis in switched reluctance machine drives
  • 3.4.1 Disconnected phase
  • 3.4.2 Disconnected phase branch
  • 3.4.3 Short-circuited pole
  • 3.4.4 Short-circuit to ground
  • 3.4.5 Phase-to-phase short-circuit
  • 3.4.6 Inter-turn short-circuit
  • 3.4.7 Power converter faults
  • 3.4.8 Rotor-related faults
  • 3.5 Fault diagnostic techniques applied to switched reluctance machine drives
  • 3.5.1 Fault detection devices
  • 3.5.1.1 Overcurrent detector
  • 3.5.1.2 Differential current detector
  • 3.5.1.3 Rate-of-rise detector
  • 3.5.1.4 Differential flux detector
  • 3.5.2 Methods based on a single electric current
  • 3.5.3 Methods based in all electric phase currents
  • 3.5.4 Other methods
  • 3.6 Fault-tolerant strategies
  • 3.6.1 Fault-tolerant control
  • 3.6.1.1 Change the commutation angle of the phase that precedes the missing phase
  • 3.6.1.2 Advance the ignition angle of the phase that proceeds the missing phase
  • 3.6.1.3 Appropriately adjust the reference control parameter during the time interval where the missing phase should be in operation
  • 3.6.2 Fault-tolerant converters
  • Acknowledgement
  • References

Inspec keywords: power system faults; switching convertors; fault tolerance; reluctance motor drives; fault diagnosis; machine windings; short-circuit currents

Other keywords: open-circuit fault detection; fault isolation; fault analysis; motor phases; low-performance degradation; fault detection; diagnostic techniques; switched reluctance motor; switched reluctance machine drives; fault diagnosis; post-fault reconfiguration strategies; SRM drives; short-circuit fault detection; faulty phases; fault-tolerant applications; machine faults; faulty element identification; power converter switch fault; motor winding fault

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

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