Cooling of Brake Systems, Generators and Transformers

With the RAILWAY LINE, punker supplies fan wheels specially developed for cooling traction motors, brake systems and transformers in rail vehicles. Made of aluminum and acoustically optimized, the punker Railway Line fan wheels achieve weight savings of up to 72% and signifi cantly lower noise emissions compared with commercially available steel fan wheels. This makes it easier to comply with statutory weight and noise emission requirements. A particularly high degree of efficiency enables energy efficient cooling of the components used in rail vehicles and compliance with energy efficiency specifications. A long service life is ensured by the aluminum material, which is corrosion-resistant in many environments, and the additional powder coating.

Traceability of all production steps - including test certificates for the materials used - and compliance with the high strength requirements is ensured by the punker Railway process initiated specifi cally for this type of application. The fan wheels are tested for their operational strength even under high dynamic loads caused by vibrations and oscillations and validated by means of a cycle test. This is done using punker‘s own test procedures and standardized test steps.

Other technical features of the punker Railway process:

• Conformity to the technical requirements (TSP) of the end customers.
• Welding according to DIN EN 15085-2 (certification level CL2);
• Coating to meet DIN EN 45545-2* (fire protection in rail vehicles)
• Batch traceability of the material with 3.1 certificate
• Temperature range from -40°C up to +80°C
• Balance quality according to ISO 21940-1

_{*The fire protection requirements of the overall system must be evaluated separately.}

Can be used in noise-sensitive environments
thanks to low noise emission from airfoil fan impeller blades.

Reduced service requirements
due to fan wheels made of aluminum, which is highly resistant to demanding environmental conditions such as saline air, humidity or low temperatures.

Reduced failure probability
due to high dynamic load capacity of fan wheels in case of vibrations and oscillations, which is validated by dynamic life test of wheel structure.

Longer service life of the fan motor
as motor bearings are subjected to less stress thanks to the up to 72% lighter aluminum fan wheels*.
_{*compared to steel design commonly used in applications}

Reduction of initial and operating costs
possible, as smaller motor classes can be used thanks to the lower power consumption required due to the high efficiency of the fan impeller.

Favors more compact system design
by requiring less installation space due to the high power density of the fan impeller.

Optimized risk management
due to a fully traceable manufacturing process thanks to material traceability through manufacturer's test certificate 3.1 and implementation of the normative welding standards according to DIN EN 15085-2.

Cooling of components of the drive and braking system such as

• Braking systems, braking resistors
• Transformers 
• Traction motors