J series Ex nA
J series from Loher have a modular cooling design featuring double-flow inner cooling for a high power density and a homogeneous temperature distribution.2 versions are available: Mounted air-water heat exchanger (JNWK–… type for roller bearings / JNXK-… for sleeve bearings): Optimum cooling is guaranteed specifically for these series due to the harmonized and coordinated heat exchanger. The motor power loss is dissipated through the cooling water and is therefore de-coupled from the ambient temperature. The heat exchangers are available in a wide variety of versions with single and double pipe types. The high quality heat exchanger materials used are adapted to the specific requirements. Mounted air-air heat exchanger (type JNRK–… for roller bearings / JNQK-… for sleeve bearings): The motors are equipped with air-air heat exchangers. The cooling pipes are manufactured out of galvanized steel; stainless steel versions are available for especially aggressive atmospheres.
Features
- Also available for exceptional requirements – such as dust explosion protection.
- Corrosion protection using special paint finishes according to the manufacturer’s standard or customer’s specification.
- The motors are available as special version for polar regions down to -40 °C (without pre-heating of the motor) or desert regions up to +60 °C.
- Wide range of connection systems for large cable cross-sections, high short-circuit strength or phase-segregated version.
- Optimized starting and operating parameters and high efficiency by using copper bar rotors as standard.
- All motors have a double flow inner cooling for a high power density and a homogeneous temperature distribution.
- Complies with almost all of the user requirements and specifications (no deviation philosophy)
- High level of acceptance in the various sectors. For instance, Shell and DOW recommend these motors
- Complete project documentation guarantees minimum planning costs
- High degree of cost effectiveness and low operating costs as a result of the optimum electrical and mechanical values
- High degree of variability and versatility using a welded steel enclosure (to adapt the dimensions, mounted components)
Customer benefits
- Complies with almost all of the user requirements and specifications (no deviation philosophy)
- High level of acceptance in the various sectors. For instance, Shell and DOW recommend these motors
- Complete project documentation guarantees minimum planning costs
- High degree of cost effectiveness and low operating costs as a result of the optimum electrical and mechanical values
- High degree of variability and versatility using a welded steel enclosure (to adapt the dimensions, mounted components)
Typical areas of application
Used in Ex-Zone 2 for:
- Pumps
- Compressors
- Fans
- Centrifuges