Motors and Drives
include metallic soaps that can be composed of calcium, lithium, sodium, aluminium or barium, and complex metallic soaps such as lithium-complex. A thickener increasingly
employed to protect electric motor bearings is polyurea and this is a key part of the make-up of Mobil Polyrex EM Series – a range of greases engineered specifically for use in electric motor bearings and able to withstand degradation under high temperatures and speed. ExxonMobil’s proprietary
polyurea thickener may provide outstanding ability to lubricate bearings at very high temperatures. The Mobil Polyrex EM range can operate at temperatures from as low as -20°C up to highs of 160°C. It also helps increase equipment protection, extend re-lubrication intervals and reduce maintenance costs.
Reducing downtime
One case that demonstrates the potential value of using an advanced grease such as Mobil Polyrex EM is from a steel manufacturer in Russia where the use of this high- performance grease significantly improved the service life of bearings. The company used a 185kW blower electric motor for hot aluminising aggregate, reaching speeds of 2900-
* This proof of performance is based on the experience of a
single customer. Actual results can vary depending upon the type of equipment used and its maintenance, operating conditions and environment, and any prior lubricant used.
Umut Urkun is with EAME ExxonMobil Lubricants & Petroleum Specialties.
www.mobilindustrial.com
energy efficiency of pump systems. NORD DRIVESYSTEMS supplies complete pre- assembled distributed drive units for a wide performance range to 22kW. In addition to energy savings of up to
60 per cent, users benefit from reduced noise emissions, low wear, and increased plant service life as well as the ecological advantages. The SK 200E series comprises reliable
and economical frequency inverters especially tailored to pump applications that precisely adjust power output as required. They are compatible with mains voltages worldwide. NORD configures complete drive
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Distributed pump drive solutions S
peed control balanced to actual requirements greatly enhances the
systems for various application areas (IP55/ IP66, ATEX zone 22/3D). Integrated process and PI controller
functions enable the fully automated control of process variables and compensation of disturbances – in stand-alone and mobile applications as well as in complex setups with several drives. Thanks to two analogue inputs, the
inverters can directly process sensor data such as pressure or flow rate. Optional signal and power plug
connectors facilitate handling and ensure compatibility. A programmable energy-saving
function automatically reacts to partial load operation – increasing efficiency and significantly reducing running costs.
4500 rpm. The combination of these speeds with working temperatures up to 120°C resulted in bearings beginning to fail after a short life span. On closer inspection by an ExxonMobil field engineer, a recommendation was made to use Mobil Polyrex EM. The previous grease used lasted only one and a half months before the bearing failed but Mobil Polyrex EM successfully performed for nine months, demonstrating a six times longer service life* compared to the previous grease. Using the right grease is not
only important to ensure the smooth running of equipment but it can also have a positive effect on the wider business. By using the right grease and ensuring electric motors are cared for
and well maintained, companies using Mobil-branded greases to protect their electric motors can reduce downtime, cut repair costs and increase productivity. ●
Operation is straightforward and flexible via control terminals, bus, or via an optional potentiometer that enables adjustments directly at the inverter. Up to four operation modes can be
stored, saving setup time; for instance during cleaning cycles or media changes. The customised parameters can be
quickly exported to other units via a pluggable storage module, the system bus, or Ethernet interfaces. With control cabinets no longer required,
the decentralised option minimises cabling effort for users, and since the inverter is supplied pre-assembled the electrotechnical effort during installation is minimal. ●
For more information, visit
www.nord.com
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