What causes shaft current?
Shaft circulating currents are caused from “dissymmetries” in the magnetic paths through the stator and rotor iron. As the rotor rotates within the stator and as the stators magnetic field rotates, small differences in the magnetic “reluctance” of the core parts generate small voltages between the ends of the shaft.
How do you measure bearing current?
You can indirectly measure bearing current by looking for sudden collapses in shaft voltage. These indicate a discharge (arc) through the bearings. You can measure shaft voltage with an oscilloscope like the AEGIS Shaft Voltage Tester, or any scope with bandwidth greater than 100 MHz.
What is the function of shaft in electric motor?
The shaft in a motor is a cylindrical component that extrudes out from the motor and its housing. The purpose of the shaft is to convert energy from the motor into the end use application. Precision pins and shafts operate as a function of speed vs torque.
What is electric shaft?
The purpose of an electrical shaft system is to synchronize the operating levers of all control units connected, mostly on the main bridge and bridge wings. It enhances the ease of use and increases safety in emergency situations, since control can be taken directly from any of the operating positions connected.
Where are shafts used?
The term shaft usually refers to a component of circular cross-section that rotates and transmits power from a driving device, such as a motor or engine, through a machine. Shafts can carry gears, pulleys, and sprockets to transmit rotary motion and power via mating gears, belts, and chains.
What is the purpose of shaft monitoring?
The purpose of shaft monitoring is to indicate the presence of high levels of voltage or current on the motor or generator shaft in order to detect poor grounding shaft performance prior to bearing failures. Poor performance of a shaft grounding brush is one of the most frequent reasons for the build-up of shaft voltage and current.
What are the methods for shaft voltage and current monitoring?
Methods For Shaft Voltage and Current Monitoring. On-line shaft monitoring using the Guard II requires the permanent installation or modification of 1 or 2 voltage brushes. Shaft current and voltage signals are continuously measured by the monitor to trend and alert when grounding maintenance is required.
What sensors are used in shaft voltage monitoring?
The sensors utilized to provide signals for Shaft Voltage Monitoring consist of insulated shaft riding brushes for shaft voltage sensing and shunts installed on the shaft grounding brushes, for shaft current sensing.
How does shaft monitoring work with the Guard II?
On-line shaft monitoring using the Guard II requires the permanent installation or modification of 1 or 2 voltage brushes. Shaft current and voltage signals are continuously measured by the monitor to trend and alert when grounding maintenance is required.