Supplementary installation, operating and maintenance instructions English
Explosion-proof three-phase asynchronous motors with squirrel-cage rotor for high voltage
815001 Edition 09.2020
14
Protection against dust ingress according to Table 1, IEC/EN 60079-31
Group
Level of protec-
tion
Enclosure - level of protec-
tion
III A (fluff, fibres)
ta
IP6X
tb
IP5X
tc
IP5X
III B (non-conductive
dust)
ta
IP6X
tb
IP6X
tc
IP5X
III C
(conductive dust)
ta
IP6X
tb
IP6X
tc
IP6X
5. Product description
5.1 Structural design
Three-phase asynchronous motors with squirrel-cage rotor of the W52. series are surface-cooled motors
(finned cooling) and are manufactured with shaft heights of 355, 400 and 450 mm. The basic version of the
motors is designed with cooling type IC 411 and protection class IP 55.
Other cooling types, e.g. IC 416 (forced ventilation), IC 410 (non-ventilated) and IC 31W (water-jacket
cooled), and protection classes (e.g. IP 56 or IP 65) are available as special versions. The horizontal types
IM 1001 (IM B3) IM 2001 (IM B35) and the vertical type IM 3011 (IM V1) are standard. Special designs are
available on request. Please refer to the rating plate or the data sheets in the electronic catalogue for the
data applicable to your motor.
The motors have the following main assemblies:
•
Stator housing with laminated core and winding
•
Bearing plates with bearings
•
Rotor with die-cast winding
•
Fan with fan guard (sheet steel version)
•
Terminal box /optional star point box
The stator housing with feet is made of grey cast iron, the bearing plates and terminal box are made of grey
cast iron. For high-voltage motors, a welded steel construction is used for the terminal box. The hood for cov-
ering the fan on the N side is made of sheet steel or glass-fibre-reinforced plastic. The terminal box can be
designed as standard with the arrangement top/straight, top/slant right and top/slant left. Subsequent reloca-
tion is not possible with these terminal boxes. Marked earthing points are located in the terminal box and on
the stator housing.
5.2 Storage
The motors are of horizontal design and the basic “light bearing” version is fitted with deep groove ball bear-
ings at the D and N ends, while the “heavy bearing” version is fitted with cylindrical roller bearings at the D
end. For other designs, a different bearing arrangement may be used. All bearings are dust-tight and
equipped with a relubrication device and grease quantity regulator. The detailed data for the motor is given
on the rating plate.
5.3 Cooling system
The motors are surface-ventilated (cooling method IC 411 according to IEC 60034). The heat exchange
takes place via the laminated stator core through to the finned housing and from size 355MX also upwards
via an internal air circuit, which transfers part of the heat loss to hollow fins, which are designed as cooling
channels. The motors have external and internal fans. With forced ventilation (cooling type IC 416), the ex-
ternal fan is not required. The air for surface cooling is drawn in by the forced ventilation fan installed in the
sheet steel hood.
