C3M C4M C5M - C3W C4W C5W - C3MH C4MH C5MH - C4WH C5WH

Housing
Rigid frame, rugged welded steel fabrication (EN 10025 - S235 JR).
Frame is provided with side ribs to increase the strength.
Marelli Motori motors for continuous duty operation are designed to meet vibration levels per IEC 60034-14, ISO 10816-1 and BS 5000-3.

Shield
Made of grey cast-iron (EN 1561 – GJL 200) up to 500 frame size motors. Made of hot-rolled structural steel (EN 10025 – S235 JR) from size 560 and above.

Shaft
General data
Made in carbon steel (EN 10083 – 2 C40 – TN) up to 450 frame and hot-rolled structural steel from 500 frame (EN 10025 – S355 JR).
Shaft design
Cylindrical shaft with key.

Main terminal box
Mounted on top.
Made of cold-rolled formable steels EN 10025 – S235JR.

Fan
Made of aluminum alloy up to 400 frame. 
Made of hot-rolled structural steel above (EN 10025 – S235 JR).

Enclosure
ODP – Open Drip Proof Motors.

Cooling System
IC 01 as per IEC60034-6 
Free circulation. 
Internal air is flowing by a fan mounted on the shaft of the motor at the driven side. 
The cooling air is taken on the ND-end, the air outlet is on the D-end. 
On request for variable speed application an external ventilation unit can be supplied to get the IC 06 cooling type.

Degree of protection
IP 23 as per IEC60034-5.
The series can be supplied with air inlet filters to achieve the IP 44 rating.
The motor series name will be C3W - C4W.

Mounting
IM B3, V1 and V10 as per IEC60034-7.

Certificate
Marine Survey Certificate supplied with the machine.
Shaft, housing (propulsion) and exchanger are certified by the Marine Classification Society.

Stator/Rotor core
Laminated and enamel-insulated on both sides to minimise eddy-current losses. The stator winding is made of flat copper or round copper wire depending on the machine size. The completely wound stator pack with housing is thereby impregnated in an epoxy-resin VPI. The subsequent heat treatment hardens the resin.

Rotor
Short circuit rotor type.
Depending on machine size, the rotor construction is either a solid shaft or welded ribbed shaft.
The rotor winding can be either a pressure die cast aluminum or a copper bar construction.

Bearing
Antifriction bearings grease lubricated (ball or roller type) or oil lubricated sleeve bearing.
The theoretical lifetime of bearings, L10h according to ISO 281/1 standard, of standard horizontal construction generators, without external forces (radial and / or axial) is in excess of 50.000 hours. On request, the lifetime of bearings, L10h can be in excess of 100.000 hours.
Locating bearings are on the D end side and floating bearings on the ND end side.
Both bearings are fitted with a regreasing system.The used grease is removed through a valve locked in the outer bearing cover. Sleeve bearings available as an option.
On request special bearings are designed where high radial and axial forces are applied. All configurations are designed to withstand the following marine inclination.

Static
List 15°
Trim 5°

Dynamic
Rolling ±22.5°
Pitch ±7.5°

Dedicated constructions available for different values.

Impregnation system
Stator and rotor are VPI treated with an unsaturated polyester amide resin which is polymerised in an oven.

Insulation system
Low voltage. 
Stator: F class insulated with a synthetic enamel. 
(H class insulation available on request)

Protective treatments
Marine dedicated protective enamel is applied on the winding.

Optional features

• Dual/multiple winding configuration
• flanged shaft or special shaft end on both sides
• increase protection degree up to IP 56
• encoder
• vibration sensors
• special frame design to suite the application
• special bearings (sleeve or angular contact bearings)
• reinforced winding for VFD operation
• insulated bearings design for VFD application
• shaft earth brush for VFD application
• other options available on request.