Within the Backer group we master several technologies for production of resistors.
Resistors - heating elements
All types of tubular heating elements can be used as resistors. The use of large diameter resistance wires, gives low resistance elements that withstand high loads. Large element diameter withstands high voltage.
The elements are 100% tested for insulation and dielectric rigidity. Also, the elements are often built into protection cages to prevent contact with heated parts. Computerized pulse load simulation is done to optimize each resistor application.
Terminal boxes with different IP classes can be used.
link to Backer terminal boxes >> (opens in new window)
Often numerous of elements are connected together, series and/or parallell, to achieve intended properties.
Example of applications
>> Further example
- Trams
- Hybrid vehicles
- Frequency converters
- Sine-wave filter resistors
Technical specification resistors - heating elements
| Material |
Steel - Grade D
Stainless Steel- EN 1.4301, EN 1.4404, UNS S31254, UNS N08904, Incoloy 800, Incoloy 825
Aluminum AA6060, AA6063 |
| Types of cooling |
Air: convection or forced convection
Liquid: water, oil etc. |
| Dimensions |
Tubular element: Ø 8,5, 14, 21 mm
Alu-profile: I- or X-shaped, with or without cooling fins. |
| Fastening of elements |
Flanges: welded or brazed
Nipples: pressed or brazed |
| Electric connections |
Cables
Threaded pins M4/M6 |
Min. resistance/
element |
0.12 ohm/m |
0.06 ohm/m |
1.6 ohm/m |
1.5 ohm/m |
| Resistance tolerance |
± 5% |
± 5% |
± 5% |
± 5% |
| Dielectric strength |
1.5 kV DC
1 min |
4 kV DC
1 min |
7 kV DC
1 min |
9 kV DC
1 min |
| Length |
300-6000 mm |
300-6000 mm |
300-1500 mm |
300-1500 mm |
| Min bending radius |
12.5 mm |
25 mm |
40 mm |
60 mm |
| Inductance |
0.5-1 µH/element |
Other electrical resistors
Danotherm, a company in the Backer groupe is known worldwide for it's qualified design and quality production of power resistors for the electronic-, the windpower-, and telecommunication industry.
Examples of products from Danotherm:
- Aluminium housed resistors
- Ceramic Wirewound resistors
- Open wirewound resistors
- Rheostats
- Steel grid resistors
New product from Danotherm: CBW, a wather cooled brake resistor. It combines the advantage of water cooling with the high pulse load ability of the traditional aluminium housed Alpha resistors.
Read more about other resistors at www.danotherm.dk