How Pulse Width Modulation is Used in Variable Frequency Drives

In this article, learn how variable frequency drives make use of the principle of pulse width modulation to create analog-type signals from a digital source, such as with motor drives. Pulse Width Modulation, or PWM, is a commonly used strategy for creating analog types of signals from a digital source. This is a common method … Read more

DC Motors – Why Are We Still Using Them?

AC motors are common throughout industry – easily controlled by VFDs and without the maintenance that comes with DC brushes. So then, why are DC motors still used in certain applications? Direct Current (DC) Motors All motors work on the principle of switching magnet forces to rotate a shaft. A DC motor uses direct current … Read more

Understanding the Basics of Pulse Width Modulation (PWM)

Power delivered to devices can be changed by raising or lowering the voltage and current. But this method does not always produce intended results. Pulse width modulation (or PWM) can be used to better control variable loads. What is Pulse Width Modulation? Load devices are designed to run efficiently and perform their respective tasks when … Read more