Products & applications Drives & motors Servo drive
family enhanced The ORMEC XD-Series indexing
servo drive family from Inmoco has been expanded with 400V models of 1.4, 2.4 and 4.8kW ratings. The new compact high- performance single-axis models support 3x peaking and offer 50% higher power density.
The XD Series offers 32 programmable motion profiles, which can be mapped to I/O points – one or two functions per point. These are initiated via Modbus/TCP, and can be chained or looped together. The adaptable I/O, with 14-inputs and 8-outputs,
Drives enable an advanced concept turbine design
Doncaster-based electrical engineering company, HS Harbon & Sons, in partnership with local businessman Richard Crowe, set up Harbon Wind Turbines with the aim of designing an advanced high performance concept turbine.
Research carried out by the company showed that the efficiency of the turbine is significantly improved by the ability to change the rotor speed. So, the resulting 60kW HWT60 variable speed wind turbine is designed to optimise the blade power output by changing rotor speed to reflect changing wind conditions.
During development, the company decided to use a variable speed drive in regeneration mode to return the generated power to the mains
offers the flexibility to be mapped to change from position, velocity or torque modes during program execution. In addition, motion can be synchronised with any supported machine I/O. The series also offers powerful inter- face capabilities. Inmoco
www.inmoco.co.uk T: 01327 307600
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grid. As a result, each turbine is fitted with four AC drives from Control Techniques. Two small 0.5kW Unidrive SP AC drives are fitted at the top of the tower, one controlling yaw (to turn the turbine into the wind) and the other controlling the hydraulics for the braking system and also acting as an interface to transmit inputs on wind speed, temperature, rotor shaft rpm and vibration to the main drive. Two 75kW Unidrive SP drives at the base of the tower, working in regenerative mode, feed AC power back to the grid. All the AC drives are fitted with plug-in SM Application modules which give fast CTNet communications and I/O modules to give extra inputs/outputs. The base modules also have Ethernet modules for feedback to the local control screen and for remote access via smart phone. The HWT60 is nominally rated at 60kW but it can exceed this for short periods. Furthermore, it is ‘Class 1 rated’ so is approved for use in locations anywhere in the UK and can withstand gales in excess of 150mph. The chassis for the turbine has been designed and built specifically for the blades, motor/generator and gearbox. The rotor shaft has two bearings, one either side of the gearbox for strength and durability. The blades are a glass fibre composite construction with a carbon fibre brace throughout the length. Any fault initiates a controlled shut-down of the system. “A further benefit of this type of turbine is that it is considerably
quieter,” says Dave Harbon, technical director. “At the optimum revs, the turbine is very quiet indeed. What’s more, the high efficiency drives are very frugal on start up – using about the same power consumption as an electric kettle!”
The HWT60 wind turbine is eligible for the Feed-in Tariff via the ROO-FIT process with each energy supplier. Control Techniques Harbon Wind Turbines
www.controltechniques.com www.harbonwindturbines.co.uk
Recycling an energy saving solution
Regain Polymers of West Yorkshire recycles around 50,000 tonnes a year, turning waste plastic materials such as polypropylene, high density polyethylene and polystyrene into pellets that are used to produce products such as water pipes and wheelie bins. During a programme to cut energy use and carbon emissions, the company identified one of its seven extruder lines as a prime candidate for improvement – this was based on a 400kW DC motor and the company wanted to convert it to AC operation. As well as the expected energy savings, the conversion to AC would elimi- nate the need to replace the DC brushes every three months, saving £2,500 a year.
ABB Drives Alliance member Quantum Controls installed a data logger which showed the daytime electricity costs for the DC motor were £424. It then fitted a 400kW ABB AC four-pole squirrel cage motor and variable-speed drive, together with new mains cable.
Following installation of the AC motor and drive, energy costs dropped to £260 a day, a saving of around £163 based on 24 hour a day production. With 300 days total production a year, this would give a total annual saving of £49,000 – an energy
reduction of nearly 870,000 kWh per year, as well as saving over 488 tonnes of CO2. The AC motor runs at the same speed as the previous DC motor, with savings coming from the improved torque ratio and efficiency of the AC drive and motor. ABB Enter 242 T: 01925 741111
www.abb.co.uk/energy 50
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Safety equipped decentralised drives Safety-equipped versions of
Metronix’s DIS-2 decentralised drive solution have been launched. These can be used as a smart drive or mounted on a servo to create a standalone smart motor. The new Safe Torque Off function- ality – PLe category 3 according to ISO 13849-1 – is said by the company to provide machine builders with an affordable means of delivering advanced machine safety features to their customers. DIS-2 drives can be used for speed, torque and positioning con- trol in common processing and packaging requirements, and can be easily integrated in automation solutions by digital and analog interfaces as well as by using the integrated fieldbus communica- tion interface. To realise multi-axis systems for higher performance and more complex movements such as interpolated motion, CANopen, PROFIBUS and EtherCAT fieldbus networking interfaces are available.
As standard, the robust and com- pact DIS-2 modules are available
OCTOBER 2012 Design Solutions
with two choices of output ratings: 2A continuous/6A peak with a 230/115 VAC power supply, or 15A continuous/40A peak with a 48 VDC power supply, and come with built-in digital and analogue I/O, Safe Torque Off capability, an RS232 port, plus a universal encoder interfacing capability that allows connection to Hall sensors, resolvers, analog/digital incremen- tal encoders, or single/multiturn absolute encoders with HIPER- FACE. A powerful Windows-based programming, configuration and diagnostic software tool enables users to create embedded drive and machine control software for Metronix DIS-2 systems. Metronix Messgeräte und Elektronik
www.metronix.de
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