Novel Method to Ensure the Reliability of the DC Motors Controlled by an IGBT / PWM Converter

For decades, the DC electric motor has been an indispensable element in the transformation of paper, resulting in an important installed base, and therefore a significant fixed asset that is not negligible. Recent advances in drive systems allow the use of PWM IGBT converters for DC motors, that typically had been used in AC motor control. However, IGBT / PWM inverters introduces effects such as voltage spikes caused by sudden changes and common mode voltages. These effects can cause accelerated deterioration of the insulation and bearings of the existing motor. This article presents a novel filter design that achieves optimal performance by mitigating these effects, presenting advantages, such as size, economy, efficiency, versatility, modularity and scalability versus traditional RLC filters.