Special Environments
Standards for electric motor enclosure protection
(in accordance with IEC34-5-1981)
|
Enclosure protection (in accordance with IEC34-5-1981) | |||
|---|---|---|---|
| Example: | IP44 | ||
| IP | 4 | 4 | |
| Designation letter |
First number |
Second number | |
| First number | Protection against contact and foreign bodies |
|---|---|
| 0 | No protection |
| 1 | Protection against large foreign bodies (diametre larger than 50 mm) |
| 2 | Protection against middle sized foreign bodies (diametre larger than 12 mm) |
| 3 | Protection against small foreign bodies (diametre larger than 2,5 mm) |
| 4 | Protection against grain sized foreign bodies (diametre larger than 1 mm) |
| 5 | Protection against dust deposits |
| 6 | Protection against dust entry |
| Second number | Water protection |
|---|---|
| 0 | No protection |
| 1 | Dripping water protection (from above) |
| 2 | Sprayed water protection (from up to 15° from vertical) |
| 3 | Sprayed water protection (from up to 60° from vertical) |
| 4 | Splashed water protection (from all directions) |
| 5 | Jet water protection (from all directions) |
| 6 | Flood protection |
| 7 | Protection when immersed |
| 8 | Protection 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: | |
| IC00 | Free convection and circulation – No fan |
|---|---|
| IC01 | Self ventilating |
| IC06 | Independently driven fan |
These codes can be further detailed to: | |
| IC0041 | Self cooled from motor surfaces |
| IC0141 | Self driven internal and external fan cooling |
| IC0641 | Independently driven external fan, self driven internal cooling |
Heating of electric machines
(Extract from BS 5850 1981)
| 11.1 | Machines and their surroundings shall not attain excessive temperatures in normal use. |
|---|---|
| 11.6 | The value of the temperature rise of a copper winding is calculated from the formula: |
 | |
| 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.
- Industry standard
Designing for special environment conditions
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.