Design World – August 2019

Product World

126 August 2019 http://www.designworldonline.com DESIGN WORLD

Ground fault

sensor

NK Technologies

nktechnologies.com

The AG-LC Series is a new ground fault

sensor that makes it easy to monitor larger

circuits. The 2011 NEC requires ground fault

protection of the main over-current device

feeding marinas and boatyards, where these

services often carry up to 800 amps. Most

sensor designs do not allow the conductors

to pass through a single sensing ring,

requiring a separate sensing device such as

a zero-sequence current transformer. The

AG-LC Series resolves this issue with a large

solid-core housing design that provides ample

space for multiple conductors to pass easily

through one sensing window.

Key applications include:

• Monitoring large machines: Early detection
  of leakage to earth


• Water treatment and delivery: Keeping
  pumping systems safe and in operation


• Generators: Shut down equipment when
  leakage current exceeds hazardous levels

Rolling bearings for motors

and generators

NKE

nke.at

Specifically designed for motors and

generators, these bearings are noted for their

low running noise, efficient seals, high load ratings,

and long service life.

Electric motors are the driving force behind most industries. In close cooperation

with the customers, these bearing solutions were designed for many types of electric

machines, such as electric motors of various sizes and for various applications, e.g.

vibrator motors, traction motors for rail vehicles, as well as generators for hydro and

wind turbines and UPS (uninterruptible power supply) systems. The most commonly

used bearing types in these applications are cylindrical roller bearings, deep groove

ball bearings, and angular contact ball bearings. Besides offering cost-effectiveness,

all bearings must operate with low noise, be durable enough to perform to the highest

standards in long term operation and, for certain bearing types, have efficient seals.

Deep groove ball bearings are suitable for locating and non-locating bearing

positions on small and medium-sized electric motors and generators, and for locating

bearing positions on larger motors. They are suitable for high rotating speeds and

moderate radial and axial loads. The bearings are quiet-running and economical. Besides

the open configuration, they can also be supplied pre-lubricated with shields or seals.

Rigid shaft couplings

Stafford

staffordmfg.com

These rigid shaft couplings offer numerous design options for

attaching unsupported shafts in a range of new and retrofit

power transmission applications. Featuring inch, metric, and

combinations of both and step bores to mate dissimilar shafts,

they can incorporate axial keyways and annular keyways for

higher loads and accurate and repeatable shaft location.

Available off-the-shelf as 1-piece, 2-piece, and 3-piece styles, Stafford Rigid Shaft Couplings

are offered in bore sizes from 1/4 to 3-in. I.D. machined from steel, stainless steel, and aluminum.

Heavy-duty styles, many material choices, shaft adapters with round, square, hex, D, threaded,

keyed, tapered, and machinable shaft ends, and specials are also available.

Product World 8-19 Vs4.LL.indd 126 8/5/19 2:23 PM