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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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Presentation on theme: "WP3 High Availability Drives Electrical Machines and Drives Research Group University of Sheffield Dr. Georges El Murr"— Presentation transcript:

1 WP3 High Availability Drives Electrical Machines and Drives Research Group University of Sheffield Dr. Georges El Murr

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 Phase – phase fault Leakage current flutes Bearing current discharge pits 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 Open winding converter topology Multiple independent phases topology Inverter with Redundancy Leg and Triacs

6 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.)

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 High Availability Drives PerformanceCost Redundancy Factor Overrating Reliability 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


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