motors-loher-xs LOHER Motors

LOHER Motors Ex d(e)

(Note: LOHER Motors has been acquired by Siemens. For more information on our available motors services for Siemens motors, please refer to our Siemens motors page. For more information on our services for existing LOHER motors, please continue reading.)

Motors with this type of protection against explosion are designed so that a possible explosion remains restricted to the inside of the motor. This means that the enclosure must be able to withstand the pressure from an explosion. In order to define the hazard as a result of an explosive gas (in comparison to other degrees of protection), in addition to the ignition temperature, it is also necessary to specify the capability of an igniting flame to be transmitted through a narrow gap in the motor enclosure. This is realized by classifying them in explosion groups IIA, IIB, IIC.


Motors with type of protection “flameproof enclosure d” are located in an explosive atmosphere, whereby this atmosphere may occur in a potentially hazardous quantity. These motors are assigned to equipment group II – Category 2G (this corresponds to Zone 1). They guarantee a high degree of safety. LOHER Ex d(e) motors are certified and optimally adapted for use in hazardous Zone 1 according to EN 50014, EN 50018, EN 50019 or EN 60079-0, EN 60079-1 and EN 60079-7. They are stamped with III 2 G Ex d IIB, II 2 G Ex d IIC according to the EC Directive (94/9/EC). (When the terminal box is designed and constructed to comply with increased safety with II 2 G Ex de IIB, II 2 G Ex de IIC.) An EC type test certificate always guarantees that the regulations are maintained and complied with.

Ex d(e) motors also fulfill – if required – the regulations relating to dust explosion protection according to EN 50281-1-1 // EN 50281-1-2 and are then correspondingly additionally type tested and documented with an EC type test certificate if the motor is to operated in an environment with conductive dust.

LOHER Motors in Ex nA

Regarding explosion protection, for Ex nA II motors, the risk of arcing and sparking or hot surfaces during normal operation is prevented with an appropriate motor design therefore guaranteeing the required degree of safety. Motors with type of protection “non sparking nA” are used in explosive atmospheres, whereby, this atmosphere may occur in a potentially hazardous quantity. These motors are assigned to equipment group II – Category 3G (this corresponds to Zone 2). LOHER Ex nA II Motors are certified and optimally adapted for use in hazardous Zone 2 according to EN 50014 and EN 50021 or EN 60079-0 and EN 60079-15. They are stamped with II 3 G Ex nA II according to EC Directive (94/9/EC). The EC Declaration of Conformity documents that these regulations have been complied with.What is worth noting: According to EN 60079-15:2005, a risk assessment must be made for all motors with rated voltages above 1 kV. Loher has successfully completed the type test for the stator and rotor according to EN 60079-15:2005. As a consequence, normally no additional measures are required up to 11 kV.

With LOHER Motors, the complex purging process before the motor started can be eliminated. When required, Ex nA motors also fulfill regulations relating to dust explosion protection according to EN 50281-1-1 // EN 50281-1-2. They are then additionally designated and documented with an EC type test certificate if the motors are operated in an environment with conductive dust. For variable-speed drives (converter operation), a type test must be performed with the actual converter intended for the application.

Technical data overview

loher-1
Motors AH.K / MLFB: 1PS1
Shaft heights 355, 400, 450, 500, 560
Power range 80 kW – 2800 kW
Number of Poles 2 – 16 poles, higher pole numbers on request
Voltage range 3000 V – 11000 V
Rated voltage 3.3 kV / 4.16 kV / 6 kV / 6.6 kV / 10 kV / 11 kV
Frequency converter Line and converter operation
Degree of protection IP55, IP56, IP65, IP67
Cooling type IC 411, IC 416, IC 71W
Type of construction IM B3, IM B35, IM V1
Enclosure Welded steel
Bearings Roller bearings, sleeve bearings
Standards IEC, EN, DIN, VDE
Explosion protection I3G Ex nA II T3
Type of protection w/o N.A.
explosion protection Noise level max. 85 dB(A) (Load, 50 Hz), lower noise versions are available

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.
  • When required, vertical motors can also be equipped with thrust bearings for high axial and radial loads.
  • 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.
  • With water jacket cooling IC71W up to 60 % higher power density – compact and low noise. Admirably suited for converter operation with constant load torque.

LOHER CHEMSTAR

In our LOHER CHEMSTAR product segment (frame sizes 071 – 355), 50 % of all of the motors we produce have a flameproof enclosure Ex d, certified acc. to ATEX.

Ex d motors for this area have type of protection II 2G Ex de IIC T4 Standard. They are optimally suited for use in hazardous Zone 1.

Also Ex d motors are always designed and constructed to address particular applications, i.e. they can be precisely adapted to the specific project with the highest degree of flexibility – exactly as the customer specifies or the project demands.

This means that individual drives are created that are tailored to the particular plant, application or project specification.

All gray cast iron motors have optimized parameters, i.e. the winding and rotor are optimally adapted to the environmental conditions (electrically and mechanically). Only then can the optimum values for efficiency and power factor be achieved (without derating) for extremely low starting currents. The result is reflected in the energy saving with the lowest load on the line supply and highest efficiency.

These motors are available either surface cooled (t.e.f.c.), water cooled and as braking motor. In addition to the usual types of construction (where the shaft and flange is also in conformance with NEMA), non-standard numbers of poles, pole-changing versions, high-speed designs as well as special cooling types are available.

Our strengths also include special voltages / special frequencies / special insulation / converter operation.

Noteworthy: Heavy-duty starting design (e.g. separators, centrifuges)
Ships’ motors according to ABS, BV, CCS, DNV, GL, LRoS, RINA, RS Classification Societies

In our LOHER CHEMSTAR product segment (frame sizes 071 – 355), 50 % of all of the motors we produce have a flameproof enclosure Ex d, certified acc. to ATEX. x d motors for this area have type of protection II 2G Ex de IIC T4 Standard. They are optimally suited for use in hazardous Zone 1.

Also Ex d motors are always designed and constructed to address particular applications, i.e. they can be precisely adapted to the specific project with the highest degree of flexibility – exactly as the customer specifies or the project demands.This means that individual drives are created that are tailored to the particular plant, application or project specification.

All gray cast iron motors have optimized parameters, i.e. the winding and rotor are optimally adapted to the environmental conditions (electrically and mechanically). Only then can the optimum values for efficiency and power factor be achieved (without derating) for extremely low starting currents. The result is reflected in the energy saving with the lowest load on the line supply and highest efficiency.

These motors are available either surface cooled (t.e.f.c.), water cooled and as braking motor. In addition to the usual types of construction (where the shaft and flange is also in conformance with NEMA), non-standard numbers of poles, pole-changing versions, high-speed designs as well as special cooling types are available. Our strengths also include special voltages / special frequencies / special insulation / converter operation.

Noteworthy: Heavy-duty starting design (e.g. separators, centrifuges)
Ships’ motors according to ABS, BV, CCS, DNV, GL, LRoS, RINA, RS Classification Societies

Technical data overview

  Surface cooled
(t.e.f.c.)
Water cooled Braking motors
Motors PS5 (LOHER CHEMSTAR) Loher name: DN.. 1PS5 (LOHER CHEMSTAR) Loher name: DNWW 1PS5 (LOHER CHEMSTAR) Loher name: DB..
Shaft heights Frame sizes 071 - 355 mm Frame sizes 160 - 315 mm Frame sizes 080 - 200 mm
Power range
(50 Hz type)
Up to 460 kW (thermally utilized to temperature class B at TU = 40 °C) Up to 500 kW (thermally utilized according to temperature class B TU= 40 °C) Up to 30 kW for braking torques from 10 to 270 Nm
Number of poles 2 - 8 pole; also higher pole numbers for special versions 2 - 8 pole 4 - 8 pole
Pole changing 2 speeds, e.g. 4/2, 6/2, 8/4, 8/63 speeds, e.g. 8/6/4 possible on request possible on request
Voltage range Low voltage up to 1000 V
Rated voltages All of the usual low voltages and voltage ranges acc. to IEC 60038. However, also: Non-standard voltages and / or frequencies according to customer specifications
Operating mode S1 and various
Degree of protection IP55, IP56, to IP66 P55, IP56, IP66 (higher degrees of protection on request) up to IP66
Cooling type C 411, IC 416, however, also special cooling types such as e.g. non-ventilated IC IC 71 W IC 411, IC 416
Type of construction IM B3, IM B6, IM B7, IM V6IM B5, IM V3, IM V1, IM V5, IM B35, IM V15, IM B14, IM B34, IM V18, IM V19 M B3, IM V5, IM V6, IM B5, IM V1, IM V3 Special types of construction possible on request M B3, IM V5, IM V6, IM B5, IM V1, IM V3, IM B35, IM V15, IM V36 Special types of construction possible on request
Enclosure Gray cast iron
Bearings Ball bearings (standard) and special bearings for high axial (thrust) and radial forces
Regulations IEC, EN, DIN, VDE
Types of protection "d" as well as dust explosion protection according to EN 50281-1-1 / EN 50281-1-2 "d" "d" as well as dust explosion protection according to EN 50281-1-1 / EN 50281-1-2
Noise Level All motors are noise-optimized (noise limit values according to EN 60034-9), low-noise version possible for 2-pole motors (GG3) All motors are noise-optimized (noise limit values according to EN 60034-9)

Features / Options

  • Regreasing system from FS 160 – SPM nipple from FS 132 – stainless steel screws / bolts – larger connection system
  • Additional terminal box in either Ex e or Ex d
  • PTC thermistor or PT100 (TMS)
  • Can also be supplied for 60 Hz (adapted winding – increased power rating)
  • All motors with insulating material class H
  • All motors are available with an electrical design according to “NEMA Standards Publication No MG1”
  • Flange and shaft end can be designed and implemented in accordance with NEMA

Special versions e.g. for

  • Forced ventilation (for converter operation), mounted speed encoder, non-standard shaft end, backstop, special paint finishes
  • Low temperatures down to -55 °C (type DN..)
  • Higher power ratings and braking torques also possible on request (type DB..)
  • Special mechanical design on request

LOHER VARIO

The LOHER VARIO Ex d(e) series has a welded steel enclosure for the highest degree of variability and versatility. Flange rings at the ends of the enclosure increase the torsional stiffness and ensure a vibration-proof mechanical design. The steel version allows various bearing concepts, dimensions can be adapted and a wide range of instruments can be mounted.

The surface cooling using flat ribs combined with a defined inner cooling circuit with shaft-mounted fan inside the motor ensure optimum motor utilization. The copper bar rotors used as standard allow starting and operating parameters to be optimized for each and every application.

With power ratings up to 3150 kW, these motors are mainly used for conveying, transporting and compressing. The rugged version allows safe, reliable and straightforward operation in Zone 1 both for line and converter operation.

Technical data overview

Motors DH.. / MLFB: 1PS4, 1PS5
Shaft heights 355, 400, 450, 500, 560
Power range 80 kW – 3150 kW
Number of Poles 2 – 16 poles, higher pole numbers on request
Voltage range 3000 V – 11000 V
Rated voltage 3.3 kV / 4.16 kV / 6 kV / 6.6 kV / 10 kV / 11 kV
Frequency converter Line and converter operation
Degree of protection IP55, IP56, IP65, IP67, IP68
Cooling type IC 411, IC 416
Type of construction IM B3, IM B35, IM V1
Enclosure Welded steel
Bearings Roller bearings, sleeve bearings (only for gas group IIB)
Standards IEC, EN, DIN, VDE
Explosion protection II2G Ex d(e) IIB T4, II2G Ex d(e) IIC T4
Type of protection w/o N.A.
explosion protection Noise level max. 86 dB(A) (Load, 50 Hz), lower noise versions are available

Features

  • Also available for exceptional requirements such as dust explosion protection or double protection Ex e and Ex d.
  • 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.
  • When required, vertical motors can also be equipped with thrust bearings for high axial and radial loads.
  • Operation with frequency converters is possible without any complex system test.
  • 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.

For more information on our motors services for LOHER motors, please contact our team or request a quote.

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