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the article citations: time:2017-04-03 20:56:24
has developed a virtually foolproof process for protecting vertical hollow-shaft motors from the electrical bearing damage caused by stray .
although destructive currents can occur in any motor, most bearing damage in motors controlled by (vfds), also known as inverters or simply as drives. vfds can save 30% or more in energy costs, but whether used to control a motor’s speed or torque, they often induce shaft voltages that discharge through the bearings, leaving fusion craters — pits in the bearing balls and race walls. concentrated pitting at regular intervals along a race wall can form washboard-like ridges called fluting, which causes excessive noise and vibration. by this point, bearing failure is often imminent.
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although destructive currents can occur in any motor, most bearing damage in motors controlled by (vfds), also known as inverters or simply as drives. vfds can save 30% or more in energy costs, but whether used to control a motor’s speed or torque, they often induce shaft voltages that discharge through the bearings, leaving fusion craters — pits in the bearing balls and race walls. concentrated pitting at regular intervals along a race wall can form washboard-like ridges called fluting, which causes excessive noise and vibration. by this point, bearing failure is often imminent.
(, and )
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