DRIVES & MOTORS APPLIED TECHNOLOGY FLOOR PREPARATION SOLUTIONS
An Australian supplier of concrete surface preparation equipment was having problems with the reliability of one of its floor grinding machines, designed to create low maintenance polished concrete floors in warehouses, retail stores, offices and even private homes. Although the drive being used on the machine was enclosed and ventilated, dust was still getting through the unit and damaging the machine’s fans and components. To overcome the problems, a variable frequency drive using 230VAC, configured for one phase support, was tried. This, however, had to use dry type capacitors which meant derating had to be massive. This caused issues with keeping the DC link stable, leading to unpredictable operation of the grinding machine and very poor torque being experienced. The company then
turned to Invertek, which recommended the Optidrive E3 with 240 VAC because it offered good stability, even when overloaded. Of additional benefit, it is also IP66 rated, meaning it is dust-tight. Brett Masters, Invertek’s sales partner in Brisbane, Australia, takes up the story: “After installing the Optidrive E3, the machine was transformed in terms
of stability while torque performance could be raised from 50Hz to 60Hz without causing any issues. “Both the motor and Optidrive E3 were tested extensively under hours of continuous, very demanding loading. Despite this onerous testing regime, motor and load temperatures were kept low and there were no problems with tripping. Even when there was poor power available, the grinding machine remained acceptably powerful and could carry out its function without any problems.”
Invertek Drives
www.invertekdrives.com
DRIVING JACKUP OPERATIONS
Used in the oil & gas industry, a jackup rig is a self-elevating mobile platform consisting of a number of movable legs, which are designed to raise the hull over the surface of the sea. A buoyant hull transports the rig and all attached machinery to a desired location, where the legs are lowered and anchored to the sea bed and the hull is raised to the required elevation. Putting a jackup rig into place is an
extremely delicate operation, so the motors responsible for driving the rig’s legs need to be highly reliable and able to withstand significant loads without any variations in current. To add to the problems, offshore operators are moving towards new fields which are often in deeper waters and under higher temperatures and pressures. When it came to replacing the motors driving the three 110m long jackup legs of its B391 rig – which is designed to reach drilling depths of 6000m, Paragon decided to partner with WEG. Ensuring that all 58 motors had the same characteristics, in terms of torque and performance, was one of the key challenges the company was faced with. Ademar Welter Júnior, sales & project engineer, WEG Netherlands, said: “We were
able to supply Paragon with 58 identical W22 NEMA motors – 18 for each leg and four spare – with the exact same torque and performance characteristics. These motors have been designed to offer enhanced reliability and withstand the rig’s load with no variations in current, thus ensuring a smooth jackup process.” The compact W22 has a stainless steel tubular cooling system which provides
optimal air flow and delivers maximum cooling capacity in the stator, rotor and critical components such as bearings, ensuring enhanced reliability and energy efficiency up to IE4 levels. Hot spots are also avoided by ensuring uniform temperature distribution in the entire frame, therefore offering highly reliable performance over a long service life. Of additional benefit, WEG adapted its W22 motors to include special features for use in marine applications.
WEG
www.weg.net/uk
IT INFRASTRUCTURE
SOFTWARE & SERVICES
www.rittal.co.uk
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