ACHEMA 2012 - Flameproof ATEX motors

Leroy-Somer has developed a range of FLSD flameproof motors with IE2 efficiency level as standard (from 11kW) in order to anticipate what this market requires. These motors benefit from the development of IE2 cast iron reference ranges in the LS2 FLSES series, which has led to a reduction in losses of at least 10%.

The manufacturer has selected low-loss magnetic laminations. The end shields are ribbed to ensure maximum heat dissipation. The profile of the housing cooling fins has been optimised, thus reducing the power absorbed by the cooling fans. The considerable reduction in temperature rise increases the life of the windings (more than 10,000 hrs on average) and reinforces the capacity to accept brief overloads. The cover and fan design also reduce the noise level:- 5 dBA for example on a 30kW motor running at 3000rpm.

A variety of complementary equipment is available: PTC or Pt100 sensors, heaters, cable gland, incremental encoder and/or forced ventilation unit, Corrobloc finish for harsh atmospheres, etc. The greasing intervals have been significantly extended, resulting in a reduction in maintenance costs: a 30kW motor running at 1500rpm, operated at an ambient temperature of 25°C, can therefore run for more than 20,000 hrs without intervention.

The IE2 LS2 FLSD range of motors rated 11 to 90 kW is available. Flameproof motors with higher power ratings will be available at the end of June 2012. In zone 2 (minimal danger), the use of Ex n non-sparking motors is mandatory. All LS2 LSN/FLSN high-efficiency motor ranges are now available as an option. All motor ranges for potentially explosive dust atmospheres (LSPX/FLSPX and LSES/FLSES zone 22) can also be supplied in an IE2 version.