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Electric motors for arduous duty

Home Engineering Mechanical – Gears & Gearboxes Electric motors for arduous duty

BMG’s team of electric motor designers and engineers has worked closely with global electric motor specialists to develop its high efficiency Synergy electric motors for arduous duty.

That’s according to Graeme Neilson, Business Unit Manager, Electric Motors, BMG, who said their flagship Synergy range of asynchronous cast iron motors complies with the efficiency requirements as stipulated in SANS 60034-30:2009 and has SABS certification, which translates into production efficiency advantages for the local market.

Standard Synergy 3-phase asynchronous cast iron motors encompass the latest technology in electric motor design and are used in many industries, including mining and metallurgy, pumps and water treatment, petroleum, chemical, cement and sugar and paper milling.

BMG supplies a full range of Synergy IE3 motors ex stock and can also supply IE4 and IE5 units from the factory, to meet exact requirements on each mine.

“Almost two thirds of the power consumed by the mining sector is associated with electric motors, particularly those used for pumps, fans and conveyors. The majority of motors on the mines are not optimised for maximum efficiency,” said Neilson. “Apart from energy saving – a critical issue facing Southern Africa – Synergy motors have important advantages over other electric motors.”

These benefits, he added, include longer service life, suitability for voltage variation applications, reduced temperature rise and minimal maintenance requirements. “Synergy motors also offer reduced noise and vibration levels, higher reliability, greater flexibility and lower cost of operation.”

Synergy IE3 motors incorporate high level specifications and features, including an IP66 rating for protection against the ingress of dust and water and an oversized terminal box with a removable gland plate, for easy replacement of the cables.

Class H insulation, with a Class B (80°C) temperature rise, means the insulation can safely withstand heat that is higher than the motor’s operating temperature at full load. Motors from frame size 80 to 132, have sealed bearings and all motors 160 frame and above have re-greaseable bearings. The standard lubrication nipples are manufactured from brass or stainless steel material and are suitable for all environments.

These motors have a rated voltage of 400 V and 525 V and rated frequency of 50 Hz. The efficiency and power factor values of this range ensure cost efficiency, with a return on the investment of between three and five years.

An important performance feature is that Synergy motors are most efficient when running between 75% and 100% of full load.

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