Learning Center

Electric Motor Buying Guide (Video)

By Yin on 21st Sep 2014

Video TranscriptHow many of you would walk into a car dealership and say, “I’m here to buy a car and I want your very cheapest car”? Well, nobody would do that, right? Because what kind of a car would you get? And yet at the …

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Shaft Grounding Rings - The Necessary Accessory for Your Motor and VFD

By Dan Hansen on 14th Jul 2014

Why do you need a shaft grounding ring (SGR)? Motors that are operated with a variable frequency drive (VFD) are more susceptible to bearing failure. In standard generated sine waves, the voltage is balanced; this means that the a …

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How to Read a Motor Nameplate

By Paul Rossiter on 20th Mar 2014

Below is a sample nameplate. You can click on the links in the nameplate to learn more. CT:VT: MODEL NO./SERIAL NO. HZ LOW VOLTAGE …

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Bearing Currents

By Craig Hartman on 20th Mar 2014

Courtesy AegisMotor bearings have a higher failure rate when the motor is run with a VFD. This is due to currents in the motor bearings. The classic solution to this problem is insulated bearings. Insulated bearings insulate the b …

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High Voltage Spike (dV/dt) and Motor Protection Methods

By Craig Hartman on 20th Mar 2014

There are two different phenomena that can create high dV/dt and high peak voltages. Reflective Wave Phenomenon Voltage wave reflection is a function of the voltage rise time (dV/dt) and the length of the motor c …

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