White Papers

How to Cost-Effectively Transition to Brushless DC Motors for Your Applications

Adriano De Rosa, IC Architect • Micronas GmbH

Integration are opening up an ever-growing array of applications for distributed intelligent small drive solutions based on synchronous motors. These include brushless DC motors (BLDC), permanent magnet synchronous motors (PMSM) and stepper motors. Because of their technical advantages and increased efficiency, these types of motors are replacing brush-type motors in many existing applications. Automobiles are a great example. Continue reading

Group Motor Protection


The usual way of preventing a small motor from drawing too much current is to install
overcurrent protection in the form of a circuit breaker or some other kind of limiter. But
installations that employ more than one motor might not want to use this approach.
Dedicating one overcurrent device for every motor can drive up costs and take up a lot
of space on the control panel. Continue reading

AC or DC Drive – Which is Best for Small Motors?

Dart Controls

Variable speed motor controls (‘drives’) have been around for many decades. In the early years, application and budget were the primary decision criteria for choosing between a DC motor/drive package and AC equivalent. While this practice continues, the advances in AC drive technology have made the decision more complex to where either AC or DC meet application requirements. Continue reading

Harmonics in Power Systems


This document has been created to give general awareness of power system harmonics,
their causes, effects and methods to control them especially when these harmonics are
related to variable frequency (or adjustable speed) drives. Some of the topics covered are:
definitions, harmonic generation, effects of harmonics and control of harmonics.

Continue reading