Wire Wound Resistors

100 Watt Power Resistor Example

100 Watt Resistor Application And Specification
We had a recent enquiry for a power resistor that was to be used in the mining industry for a braking resistor for a conveyor belt system used in a coal loading terminal in Newcastle. The motor requiring the braking resistor was slightly unusual in that it was a d.c. (direct current) motor. The resistor required had the following requirements in its specification:

3.9 ohm resistance
Maximum current rating 4.5 amps (d.c.)

Using basic resistor theory we determined that the most appropriate power rating for the resistor would be found by using the formula Power (dissipated in the resistor) = […]

September 8th, 2014|Applications, Power Resistor, Resistor Applications, Wire Wound Resistors|

200 Watt Power Resistor

200 watt rated power resistors  are commonly used in industry in a wide range of applications including:

resistor load banks
dropping resistors in large power supplies
power conversion circuits
braking applications

Tubular power wire wound resistors are often considered to be the ‘standard’ in high power resistors as they offer a ‘tried and tested’ solution and offer high reliability and low cost. The HO Series power resistor is often used when a 200 watt rated resistor is required. This resistor specification includes:

200 watt rating
267 mm ceramic former length
29 mm ceramic former diameter or 33 mm when coated
Mounting feet centres are 292 mm
For the standard fixed power […]

Wirewound Resistors – Basic Resistor Principles

Understanding Critical Parameters In Resistor Selection – Ohms Law
Going back to college fundamental physics is helpful in understanding the most commonly used parameters used in specifying wirewound and power resistors. Good engineering practice will generally mean that a certain degree of ‘over specifying’ will result in long term reliability and performance of the final product – be it a motor control circuit, power supply, resistor bank, heating or cooling appliances or printed circuit board control circuitry.

Resistance – Ohms Law

Ohms law is possibly the most fundamental equation taught in electrical engineering. It is the foundation principle used to determine the relationship […]

Wire Wound Resistors – Manufacturing In Australia

The Australian manufacturing industry has gone through significant changes over the last 25 years and the electronics manufacturing sector is no different. In an increasingly competitive, price driven manufacturing world, the Australian electronics industry has followed many other industries looking to reduce costs, to move part or all of their electronic manufacturing overseas, notably to China.

This trend to Chinese based manufacturing started in the mid 1980’s and China was seen as a way of slashing manufacturing costs for some Australian companies. Whilst this trend continued for the next 20 years or so, recently we have witnessed a move back to […]

January 19th, 2014|Wire Wound Resistors|

Wire Wound Resistors Used In Heavy Industry

Wire wound resistors have been used for many years in heavy industry in a huge array of applications where the need to dissipate a large amount of power in a resistive assembly is required. A recent application that required a 200 watt power resistor was in the mining industry where large electric motors used in the drive chain of coal conveyor belts, employed large capacitors that needed to be discharged safely and efficiently and required a suitable wire wound resistor capable of handling significant amounts of electrical energy during their discharge.

Mounting Considerations

The client had advised us that due to the […]

November 1st, 2013|Wire Wound Resistors|