Product category: Resistors
News Release from: TT Electronics Welwyn Components | Subject: WDBR series
Edited by the Electronicstalk Editorial Team on 16 January 2007
Dynamic braking resistors
keep low profile
Welwyn Components has enhanced its WDBR series with the addition of a new range of ultra-low-profile dynamic braking resistors
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The WDBR series is a range of braking resistors used to limit the voltage rise that naturally occurs during the motor speed reduction phase. During motor speed reduction the motor supplies electrical power back to the source power electronics, causing the DC voltage supply to increase. The WDBR intervenes by providing a fast thermal response, dissipating heat and reducing the risk of damage to the inverter electronics.
The new addition to the series offers high pulse withstand capability up to 7kW and inductance values up to 6uH.
In addition, the WDBR's insulated stainless steal substrate behaves as a heatsink, providing mechanical strength and robustness, along with the ability to withstand temperature recycling of up to 400 degrees.
With a continuous power rating of up to 1490W and a minimum dielectric withstand voltage of 2500V, the RoHS-compliant WDBR series offers a high performance, cost competitive solution to dynamic breaking.
Further reading
Funds to boost thick- and thin-film development
Welwyn Components will invest Eur 1.2 million in thick- and thin-film research and development over the next three years
Thick-film resistors aid product miniaturisation
The VRW series has been developed to provide design engineers with a compact high voltage resistor with working voltage ratings of 1.6 and 3.5kV, and high pulse withstand capability of 10kV
Its compact footprint and low profile will enable designers working on demanding applications such as industrial welding to reduce overall product sise and lower design cost.
Having been subjected to extensive high power pulse laboratory testing, the WDBR series has demonstrated good stability and reliability and is regarded by Welwyn as a significant improvement to existing resistor configuration offerings.
John Graham, Marketing and Sales director said: 'The WDBR series provides design engineers with a compact product with high voltage capabilities and low inductance, which offers a failsafe and cost-effective solution to dynamic braking'. Request a free brochure from TT Electronics Welwyn Components....
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