Technical Articles

Harmonic Mitigation in Variable Frequency Drives: 6-Pulse Drive with Matrix AP Harmonic Filter vs. AFE Drive

Todd Shudarek, Principal Engineer – The proliferation of variable frequency drives (VFDs) has brought increased attention to harmonic effects created by drives. A standard 6-pulse drive with no harmonic mitigation technology may interfere with neighboring equipment, reduce equipment life, and negatively impact the utility power quality. Under some circumstances the total harmonic current distortion (THID)… Read more »

Harmonic Mitigation in Variable Frequency Drives: 6-Pulse Drive with MTE Matrix AP Harmonic Filter vs. 18-Pulse Drive

Todd Shudarek, Principle Engineer – The proliferation of variable frequency drives (VFDs) has brought increased attention to harmonic effects created by drives. A standard 6-pulse drive with no harmonic mitigation technology may interfere with neighboring equipment, reduce equipment life, and negatively impact the utility power quality. Under some circumstances the total harmonic current distortion (THID)… Read more »

For Most – Huge Savings Through Reducing Harmonic Distortion

As Variable Speed Drives (VFD’s) continue to proliferate throughout industry and institutional buildings, as well as many diverse applications such as pumps, factory automation, and process equipment, the problem of Harmonic Distortion increases directly with the number of VFD’s being used. While there are many ways to deal with harmonic distortion, there is often one… Read more »

Economical Solutions to Meet Harmonic Distortion Limits

The widespread adoption of variable frequency drive technology is allowing electricity to be utilized more efficiently throughout most of the world. Following right behind the adoption of drives is the establishment of harmonic distortion limits. This can cause confusion and may instill needless fear in people involved in the decision to apply variable frequency drives…. Read more »

Solving SCR Line Voltage Notching

When Silicon Controlled Rectifiers (SCR’s) are used in electrical controls, we frequently experience line voltage distortion in the form of “notches” in the waveform. The types of equipment that frequently utilize SCR control schemes and thus experience notching include DC motor speed controls and induction heating equipment.

Low Cost Motor Protection for PWM Drive Applications Stops Motor Damage

Karl M. Hink, Executive Vice President – Motor protection filters are proven economical devices to improve inverter-fed motor reliability, increase motor life, and solve long lead over voltage problems. This paper demonstrates the benefits and applications of a number of different types of motor protection filters, including sine wave and single element low-pass filters. Output… Read more »

Load Reactors – Increase VFD System Performance & Reliability

Reactors have been used for many years to solve problems in variable speed drive installations. About ten years ago the use of line reactors started to become more common as they helped to solve typical problems on the input (line side) of variable frequency drives (VFD) and SCR controllers. They often have been used as… Read more »