What is Aegis ring?

What is Aegis ring?

AEGIS® SGR Bearing Protection Rings are designed to divert bearing currents to ground by providing a highly reliable shaft grounding path. The AEGIS® shaft grounding technology prevents bearing “fluting” damage when motors are controlled by variable frequency drives (VFD).

What does a shaft grounding ring do?

The shaft grounding ring protects motor bearings by offering an alternate path to ground for shaft voltage—directly from the motor shaft through the ring to the motor’s housing (ground), avoiding the bearings altogether.

Can a VFD damage a motor?

VFDs can wreck motor windings. VFDs control motors with a simulated sine\ wave known as pulse width modulation (PWM). The problem is that peak voltages created by the VFD can often get high enough to break through motor insulation and short out motor windings.

What causes bearing fluting?

Fluting is the result of shaft currents in an electrical motor going to ground through the motor bearings. This problem is most often found with drive systems, however, welding operations in the area can cause this if the motor shaft becomes part of the ground path.

What is bearing fluting?

What is Fluting? Fluting is a form of electrical damage suffered by electric motor bearings when alternating (AC) or direct (DC) current actually passes through the metal bearing. As the currents pass through the bearings, they can leave behind surface damage that results in premature bearing failure.

How long do aegis rings last?

Designed with specific mechanical and electrical characteristics that minimize wear and maintain conductivity, AEGIS® microfibers will last for the life of the motor. Based on wear of less than 0.001” [0.025mm] during 10,000 hours of testing, proven to withstand over 200,000 hours of continuous operation.

Can any AC motor be used with a VFD?

While we’ve solved the single-speed problem of AC induction motors by introducing the variable frequency drive, not all motors are VFD compatible. Some motors are specifically designed to run on VFD power, while others need a few components added to the system to be compatible.

Can any 3 phase motor be used with a VFD?

It is not necessary to have 3 phase electrical input in order to operate a 3 phase motor with a VFD. A 3 phase motor simply attaches to the appropriate output connectors on the VFD. Corresponding input voltage is not a factor in the output voltage.

What causes false Brinelling?

False brinelling is caused by vibrations acting on the bearing while in a non-rotating state and may occur on new equipment which has been carelessly transported. The signs of this type of brinelling, as seen in the image to the right, are depressions and wear marks in the bearing raceway along the axial direction.

What is one way to correct or mitigate electrical pitting or electrical fluting in a bearing?

There are several ways to prevent fluting. One is to degauss electric motors after they have been repaired to prevent shaft circulating currents from forming as a result of magnetization during repair.

What is an Aegis ring?

AEGIS ® SGR Bearing Protection Rings are designed to divert bearing currents to ground by providing a highly reliable shaft grounding path. The AEGIS ® shaft grounding technology prevents bearing “fluting” damage when motors are controlled by variable frequency drives (VFD).

What is a Sgr bearing protection ring?

AEGIS ® SGR Bearing Protection Rings are designed to divert bearing currents to ground by providing a highly reliable shaft grounding path. The AEGIS ® shaft grounding technology prevents bearing “fluting” damage when motors are controlled by variable frequency drives (VFD). Various mounting options are listed below.

What is aegis® shaft grounding?

The AEGIS ® shaft grounding technology prevents bearing “fluting” damage when motors are controlled by variable frequency drives (VFD). Various mounting options are listed below. Shaft diameters: 0.311″ to 6.02″ [7.9mm to 152.9mm]

What tools do I get with the aegis shaft voltage tester?

For the first time you can get all of the tools you need in one kit. The AEGIS Shaft Voltage Tester Digital Oscilloscope bundle includes the AEGIS-OSC-9100 100 MHz digital oscilloscope, shaft voltage probe tips, and a shaft grounding simulator.