Motors with modular cooling from 3 to 10 MW with welded steel enclosure, for maximum safety and availability in demanding applications, predestined for test stands, oil, gas and petrochemical plants. The inner cooling using two shaft-mounted fans ensures a high power density and homogeneous temperature distribution.
Safe operation in hazardous areas Zone 1 and 2
Compact, reliable and long service life
Outstanding suitability for deserts and arctic regions
Highly modifiable for individual customer demands and retrofit applications
Increased reliability due to availability of redundant cooler and forced ventilation designs
630, 710 mm
3 – 10 MW
No. of poles:
2 – 16 poles (higher on request)
3 – 11 kV (higher on request)
Degree of protection:
IP23, IP55, IP56
IC 611, IC 616, IC 666, IC 81 W, IC 86 W, IC 01
Non sparking, Zone 2, II 3 G Ex nA IIC T3 GcPressurized, Zone 1, II 2 G Ex px IIC T3 Gb(Ex tc, Ex e, and Ex pz possible on request)
Available in most Ex-protection types including Ex nA and Ex px (Ex tc, Ex e and Ex pz available on request)
All motors feature double-flow inner cooling for a high power density and a homogeneous temperature distribution
Available in high and low temperature designs
Highest degree of flexibility regarding both the electrical and mechanical features e.g.- starting characteristics- noise requirements - vibrvibration limits- efficiency requirements
Special design for subcritical variable speed operation available
Slip ring design available on request
Engineered based on international standards (ATEX, NEPSI, EAC (Gost), CCOE certified)
Tailored to the requirements of pumps and compressors in the oil & gas industry, LOHER VARIO PLUS motors are available with explosion protection of Ex nA, Ex e or Ex p specifically to support applications in Zones 1 and 2. Double certification (e.g. with Ex pz and simultaneously Ex nA) can also be implemented on request. The LOHER VARIO PLUS is also available with special coating systems to protect against very humid, salty marine or chemically aggressive environments, plus they also comply with Norsok specifications. Special designs are offered for oil and gas fields in arctic or desert regions, as well as for compliance with API standards and the associated high requirements regarding vibration quality frequently specified in the oil and gas Industry.
Tailored to the requirements of agitators and extruders in the petrochemical industry, LOHER VARIO PLUS motors are available with explosion protection of Ex nA, Ex e or Ex p specifically to support applications in Zones 1 and 2. Double certification (e.g. with Ex pz and simultaneously Ex nA) can also be implemented on request. The LOHER VARIO PLUS is also available with special coating systems to protect against chemically aggressive ambient atmospheres. Special designs are offered for compliance with API standards and the associated high requirements regarding vibration quality frequently specified in the petrochemical industry.
For rolling mill drives in the metals industries LOHER VARIO PLUS motors are – also in the lower shaft heights from 355 up to 560 mm – available in shockproof, welded steel housing, with high overload capability, forced ventilation and torque rates up to 70 kNm.
For shipbuilding applications such as on board main pumps, thruster or propulsion drives, LOHER VARIO PLUS motors are available with lightweight, space-saving designs, great high vibration quality and low noise level. The motor is also available with special coating systems to protect against aggressive, salty marine environments and fully complies with the specifications of the leading marine classification societies.
The LOHER VARIO PLUS is also utilized in numerous complex and technically sophisticated test stands, such as pump or compressor test beds.
Cell-based MV drive featuring a separate transformer
4 – 30 MVA; up to 7.2 kV
Motor friendly & cell bypass
Cell-based MV drive featuring an integrated transformer
0.18 – 24.4 MVA; up to 11 kV
Air- and water-cooled
Over 12,000 drives sold
Customized MV drive system for special requirements
6.3 – 13.7 MVA; up to 7.2 kV
Line and motor side customization
Motor friendly and 4 quadrant operation
Single motor MV drive with 3-level voltage source
IGBT: 1 – 13 MVA; up to 4.16 kV
IGCT: 10 – 30 MVA; up to 3.3 kV
Compact and rugged design
Single/multi motor MV drive with 3-level voltage source
IGCT: 10.5 – 40 MVA; up to 3.3 kV
IGBT: 3.4 – 7.2 MVA; up to 4.16 kV
2 or 4 quadrant operation