WP3 High Availability Drives
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Transcript of WP3 High Availability Drives
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WP3 High Availability Drives
Electrical Machines and Drives Research Group
University of Sheffield
Dr. Georges El Murr
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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
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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
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How Does a Machine Fail ?Groundwall – winding
fault
Phase – phase fault Leakage current flutes
Bearing current discharge pits
Focus on Electrical
Phenomena
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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
Open winding converter topology
Multiple independent phases topology
Inverter with Redundancy Leg and Triacs
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Fault Tolerant Machine Designs
Switched Flux PM Machine
PM Assisted Sync Reluctance Machine
Fractional Slot Concentrated Winding PM Machine
• 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.)
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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
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High Availability
Drives
• Healthy and Faulty conditions
• Overall all cost of the drive
• Amount of additional components• Overload capability of
components
• Life time estimation under healthy and faulty
conditions