Special Environments

Motor operating in vacuum environment Motor working in nuclear environment Motor working in cryogenic environment

Our motors, controllers, test equipment and marine products can all be adapted for special environment and safety requirements. Our task is to work at developments which adapt well to a new era, more concerned about the environments and safety.

We are committed to assisting development of products that can be constructed using biodegradable materials and substances that have minimum effect on the environment.

Standards for electric motor enclosure protection
(in accordance with IEC34-5-1981)

Enclosure protection
(in accordance with IEC34-5-1981)
Example: IP44

First number Protection against contact
and foreign bodies
0No protection
1Protection against large foreign bodies
(diametre larger than 50 mm)
2Protection against middle sized foreign bodies
(diametre larger than 12 mm)
3Protection against small foreign bodies
(diametre larger than 2,5 mm)
4Protection against grain sized foreign bodies
(diametre larger than 1 mm)
5Protection against dust deposits
6Protection against dust entry
Second number Water protection
0No protection
1Dripping water protection
(from above)
2Sprayed water protection
(from up to 15° from vertical)
3Sprayed water protection
(from up to 60° from vertical)
4Splashed water protection
(from all directions)
5Jet water protection
(from all directions)
6Flood protection
7Protection when immersed
8Protection when submerged

Standards required for flame proofing electric motors
(Extract from the DIN standard EN50014/VDE0170/171 part 1/5.78)

Normal   Operation with possible danger.
With constant danger, special consideration of the gas in question is necessary.
Ignition protection E Exp Excess pressure enclosure
(earlier exf = force - ventilation
with non-explosive gas or fresh air)
E Exe Increased safety
(only for motors which are unable to produce sparks while operating 3-phase squirrel cage rotor)
E Exd Explosion proof enclosure
(a possible explosion must be contained)
Gas groups I Flame proof
II Other ex protections
II A.B.C. Subdivided according to special specifications, especially with E Exd: permissible air gaps
in designs decrease from A to B to C.
Temperature classification T1 to T6 Depending on permissible surface temperature:

Example of motor coding: E ExdIIBT3

For some typical examples of flame-proof IEC motors, 50 Hz, click here.

Cooling of electric motors
(Extract from BS 4999 pact 21.1972)

The common codes for motor cooling are:
IC00Free convection and circulation – No fan
IC01Self ventilating
IC06Independently driven fan

These codes can be further detailed to:
IC0041Self cooled from motor surfaces
IC0141Self driven internal and external fan cooling
IC0641Independently driven external fan, self driven internal cooling

Heating of electric machines
(Extract from BS 5850 1981)

11.1Machines and their surroundings shall not attain excessive temperatures in normal use.
11.6The value of the temperature rise of a copper winding is calculated from the formula:
Calculation formula for temperature rise of copper winding
where  Δt is the temperature rise
R1 is the resistance at the beginning of the test
R2 is the resistance at the end of the test
t1 is the room temperature at the beginning of the test
t2 is the room temperature at the end of the test

Our motors & drive solutions can be adapted to special environment conditions.
We have already adapted many of our motors, controllers, gear drives and test equipment for harsh and difficult environments. Some of the following applications require careful design detail to ensure that our products function well under tough conditions.

  • Heat environments
    • Large ovens/industrial
    • Convection ovens
    • Pizza ovens
    • Spit drives
    • Forge equipment
    • Industrial heat process
  • Water environments
    • Washdown process
    • Swimming pool pumps/robots
    • Pool cleaners
    • Pool covers
    • Spa systems
    • Jet pumps
    • Tub systems
    • Hot water pumps
    • Submersible — tanks and containers
    • Sprinkler systems
  • Explosion proof
    • Industry standard
      Class I (gases, vapours)
      A —Acetylene.
      B —Butadiene, ethylene oxide, hydrogen, propylene oxide.
      C — Acetone, acrylonitrile, ammonia, benzene, butane, ethylene, dichloride, gasoline, hexane, methane, methanol, naphtha, propane, propylene, styrene, toluene, vinyl acetate, vinyl chloride, xylene.
      Class II (combustible dusts)
      E —Aluminium, magnesium, metal dusts with similar characteristics.
      F —Carbon black, coke or coal dust.
      G —Flour, starch or grain dust.

Designing for special environment conditions

Special environment conditions drawing

As detailed above, we would be prepared to work with you to design the most suitable solution for your special environment applications.

Important note:

For special purpose components, electronics, motors and drives, we require complete specifications and standards classifications.
Typical applications in chemical plants, oil refineries and other similar industrial environments will be certified to conformity.