Bearings & Drives-Rockwell
68
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Transcript of Bearings & Drives-Rockwell
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Ron Brook - Rockwell Automationpresented at
Vibration InstituteDelaware Valley Chapter
January 27, 2000
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Problem caused by Electric AsymmetriesProblem caused by Electric Asymmetries
Circulating Current - Insulate ODE BearingCirculating Current - Insulate ODE Bearing
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Stator neutral voltageBVR =
BVR - “Bearing Voltage Ratio”
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• Load• Speed• Temperature• Lubricant
• Viscosity• Additives• Oil Film Thickness• Dielectric Properties
Non Linearity Variables
• Asperity Contact Area• Randomness
• Mechanical• ElectricalCb
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Motor Frame
Stator Laminations
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OuterRace
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Voltage Path
Oscilloscope
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Rotor Shaft Voltage Spikes
Inverter Drive Carrier Frequency set to 2 KHz
Motor Operating at 100 Hertz
Rotor Shaft Voltage Spikes
Inverter Drive Carrier Frequency set to 14 KHz
Motor Operating at 25 Hz
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