Solution for slow-running AC induction motors
A
WEG Electric Motors product story
Edited by the Engineeringtalk editorial team
Oct 1, 2008
A solution to specification problems for AC induction motors running at slow speeds under frequency converter/variable speed drive control has been developed by WEG Electric Motors.
Ideal for variable and slow-speed driving of positive displacement pumps, WEG's patented Optimal Flux Technology (OFT) solution eliminates the cost and size penalties of some manufacturers.
With these benefits, the WEG NEMA High, Premium or EFF1 AC induction motor and the Optimal FluxTM option with the CFW-09 Variable Frequency Converter combination costs around 10 per cent less than competing inverter-class drive solutions.
Another advantage of the Optimal FluxTM CFW-09 or CFW-11 Variable Frequency Converter is the self-calibration setup for the most efficient operation when starting to drive the electric motor.
In addition, WEG can offer a three-year extended warranty, with less maintenance costs and down time.
As well as pumps, typical applications include industrial fans and air-conditioning systems, and motors range from 3kW and 110kW in power.
Andy Glover, product manager LV Machines at WEG, said: 'The Optimal Flux Technology is the result of WEG's developments in frequency converter programming architecture which ensures the drive adjusts the flux of the motor to ensure minimum losses at every speed.
'The specific advantages of the Optimal FluxTM solution are also demonstrated in the new WEG CFW-11 drive.
'As result, a WEG 20HP NEMA Premium runs 22 per cent cooler using the Optimal FluxTM solution when compared to constant flux, for example.
'This contrasts with conventional drives where the flux is kept constant, resulting in temperature rises at low running speeds with constant toque that can significantly reduce the life of the coil insulation, halving the motor lifetime for a 10C rise.
'To reduce this effect, conventional solutions include extra external fans for cooling or oversize the motor so as to minimise the extra heat load, but always resulting in more expensive package units.
Conventional solutions can therefore take up extra space, are overpriced and are not energy efficient, or else run the risk of early breakdown, high maintenance costs and unexpected downtime.
With Optimal FluxTM CFW-09 or 11 drives combined with WEG Energy Efficient motors, the occurrence of such problems is minimised and the improved environmental efficiency and reduced operating costs are able to benefit every business.
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