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WP3 High Availability Drives

WP3 High Availability Drives. Electrical Machines and Drives Research Group University of Sheffield Dr. Georges El Murr g.elmurr@sheffield.ac.uk. Introduction. Electrical drives benefits over Mechanical, Hydraulic and Pneumatic systems: More economical Environmental friendly

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WP3 High Availability Drives

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  1. WP3 High Availability Drives Electrical Machines and Drives Research Group University of Sheffield Dr. Georges El Murr g.elmurr@sheffield.ac.uk

  2. Introduction • Electrical drives benefits over Mechanical, Hydraulic and Pneumatic systems: • More economical • Environmental friendly • Higher efficiency • Less maintenance • More flexible in compact places • Electrical drives system should be fault tolerant and reliable to be applied in safety critical applications: • Appropriate fault tolerant drive design (power module) • Appropriate Fault tolerant machine design (motor) • Health monitoring of machine and drive to detect early stage defects allowing maintenance with minimal downtime

  3. Power Module Faults • Potential faults in the power module may lead to: • Instability of the drive • Loss of power complete drive shut down • Power reduction performance can be dramatically reduced • Excessive power input (voltage/current) leading to catastrophic deterioration of the drive

  4. How Does a Machine Fail ? Groundwall – winding fault Bearing current discharge pits Leakage current flutes Phase – phase fault Focus on Electrical Phenomena

  5. Fault Tolerant Inverter Designs • Appropriate inverter topologies can be designed to tolerate open-circuit and short-circuit faults • Faults should be detected • Remedial strategies should be used to control the inverter Multiple independent phases topology Inverter with Redundancy Leg and Triacs Open winding converter topology

  6. Fault Tolerant Machine Designs • Avoid complete damage of the machine • Keep producing the appropriate level of performance when fault occurs • Reduce the possible damaging effects of the faults ( torque ripple, demagnetization, thermal, etc.) Switched Flux PM Machine PM AssistedSyncReluctance Machine Fractional Slot Concentrated Winding PM Machine

  7. Health Monitoring • Zero Sequence Model of Machine and Drive • Indicator of insulation impedance • Detecting bearing current • Potential for cable/drive leakage monitoring • Difficult to measure to required accuracy • Temperature • Model based prediction of lifetime • Real-Time thermal model • How does load variation affect life? • Cancelling temperature dependence in monitored parameter variation • Partial Discharge • Standard online indicator for high voltage • Potential for increased problems with fast switching drives Leakage Paths in a Machine Equivalent circuit for leakage

  8. Healthy and Faulty conditions • Life time estimation under healthy and faulty conditions • Overall all cost of the drive • Amount of additional components • Overload capability of components

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