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shaft voltages
Reduction of capacitive and induced shaft voltages in an induction motor drive using dual-bridge inverter approach
      
The approach reduces the capacitive and induced shaft voltages by more than 80% in the examined 1.4MW induction motor drive.
      
Medium frequency shaft voltages in large frequency converter driven electrical machines
      
The operation of large electrical machines like turbo-generators with ratings of several hundred MVAs by static frequency converters can cause shaft voltages of several hundred volts.
      
The shaft voltages consist of peaks with a time constant of some μs.
      
Experimental results similar to these confirm excessive neutral and shaft voltages are possible with long cable lengths.
      
However, the use of frequency converters can introduce additional mechanisms of inducing shaft voltages, discussed in later sections.
      
It discusses shaft voltages as a failure indicator and proposes current magnitudes as an additional indicator for PWM voltage source inverters.
      
It induces rotor shaft voltages through stray capacitances between the stator and rotor.
      
Induced shaft voltages may cause currents capable of damaging the bearings.
      
Machines contain magnetic dissymmetries inducing end to end sine wave axial rotor shaft voltages that result in bearing current.
      
Shaft voltages and the resulting bearing currents were measured and their components identified.
      
This report principally considers the effects of shaft voltages developed by the voltage source PWM inverter.
      
The path of the impedance of the bearing circuit is so low that small shaft voltages may cause substantial bearing currents.
      
The result is shaft voltages and current flow across the motor bearing to ground causing motor bearing damage and failures.
      
The shaft voltages then exceed the breakdown strength of the lubrication oil film, leading to flashover between the bearing races.
      
Under this condition, the impedance of the bearing circuit is so low that small shaft voltages may cause substantial bearing currents.
      
 

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