A6C A5C-B6C B5C B5H

Housing
Motors from size 71 to 132 are made in cast iron.
Motors from size 160 to 280 are made either in aluminum or in cast iron (optional).
Starting from frame 315 and up to 500 the frame is in cast iron only.
(EN 1561-GJL – 200)

Shield
Made of grey cast-iron (EN 1561 – GJL 200) up to 560 frame size motors.

Shaft

General data: Made in carbon steel (EN 10083 – 2 C40 – TN) up to 500 frame
Shaft design: Cylindrical shaft with key.

Material

The table below, show the materials used on the mechanical components for standard motors. 
Terminal box casted with frame for 71 and 80 sizes

Main terminal box
Mounted on top and made of cold-rolled formable steels EN 10025 – S235JR or cast iron depending from size. Degree of protection of standard terminal box is IP 55.

Cooling System
IC 411 as per IEC60034-6
Totally enclosed standard motor, frame surface cooled with fan
4: Frame surface cooled
1: Self circulation of primary coolant
1: Self circulation of secondary coolant
On request for variable speed application an external ventilation unit can be supplied to get the IC 416 cooling type.

Degree of protection
Motors are supplied in IP 55 as per IEC60034-5 (IP 56 or IP 65 available on request)

Mounting
Mounting and positions are defined according to IEC 60034 - 7
See complete list at page 20 of Industrial motors catalogue.

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 from 355 frame size. 
The subsequent heat treatment hardens the resin.
Up to 315 frame size the wound stator pack is impregnated by rolling deep technology.

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
General data
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 motors, 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.
Sleeve bearings available as an option from 355 frame and above.
On request special bearings are designed where high radial and axial forces are applied.

The motors from 160 to 250 frame size have single screen prelubricated ball bearings (without grease nipples).
The correspondent grease life under normal operating conditions for a motor with horizontal shaft, at 50Hz and maximum ambient temperature of 40°C is

• 10 000 hours in continuous duty for 2-pole motors
• 20 000 hours in continuous duty for 24-pole motors

The motors from 280 frame size and above have regreasable bearings (with grease nipples Tecalemit UNI type) and the relative exhausted grease drainage. 
 

Impregnation system
Up to 315 frame size: stator is impregnated with rolling deep technology.
Starting from 355 frame size: stator is VPI treated with an unsaturated polyester amide resin which is polymerised in an oven.
(For other size is available on request)

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

Protective treatments
Dedicated protective enamel is applied on the winding.

Grounding
Two terminals exist for grounding, one inside the terminal box and one outside.

Condensation drainage
When installed outdoors or used for intermittent work in environments with high humidity levels, motors must be provided with holes for condensation drainage.
Motors with frame sizes from 280 to 500 have holes for condensation drainage as standard. Motors can be supplied with drainage holes on request.

Anticondensation heaters
Motors subject to atmospheric condensation, either through standing idle in damp environments or because of wide ambient temperature variations, may be fitted with anticondensation heaters. 
Anticondensation heaters are normally switched on automatically when the supply to the motor is interrupted, heating the motor to avoid water condensation. 
They are normally mounted on D-end winding heads.
Normal feeding voltage is 220//230/240V.
Motors can be supplied with anticondensation heaters with terminals in main terminal box (Opt. 108) or, with terminals in a separate terminal box (Opt. 109).
The power values normally used are shown in the table below:

Thermal protections

Standard magnetothermal circuit brakers are sufficient to suitably protect the motor from overloading. 
Anyway the motors can be supplied with additional thermal protections with the characteristics described in the following table.

Motors from 315 frame size are supplied with N. 3 PTC with terminals in main terminal box, in standard execution. 
Frame size from 355 are supplied with terminals in separate terminal box, in standard execution.
Motors from 160 frame size can be supplied with PT100 thermal detectors on the bearings on request.

Optional features

• Dual/multiple winding configuration
• flanged shaft or special shaft end on both sides
• increase protection degree up to IP56 and IP65
• 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