Over the years, electricity has become a basic necessity, without which life as we know would simply become dysfunctional. In such conditions, the need for energy efficiency has become a top requirement across the industrial spectrum. When rising energy costs are coupled with uncertainty of available electricity, the result is increased relevance for the part of the business responsible for boosting efficiencies.
Encoders are a necessary component of the industrial world, and can be found supporting a range of tasks, from positioning a patient in an MRI machine to bottling beverages at high speed. An absolute encoder, as the name suggest keeps the record of its position following some absolute coordinate system. An absolute encoder produces digital words in order to identify its location, and is often used in mission-critical applications that require greater speed and accuracy.
The widespread adoption of Variable Frequency Drives (VFDs) has brought in the adverse effects of non-sinusoidal voltage sources. The benefits reaped by this technology may outweigh the cons, but still motors have to be designed to withstand these effects and perform over a long service life.
Rising utility costs on one side and higher initial investment costs on the other are becoming problems for businesses with every passing day. Getting higher Return on Investment (RoI) is vital for a business to sustain its operations, and engineers and managers have been working hard to keep the balance sheet in their favor.
AC Motors have always been in competition with their DC counterparts since the widespread use of electrical technology within industries. While both these motors have their own sets of pros and cons, AC Motors are slowly taking over the DC motor-dominated industrial sector thanks to Adjustable Speed Drives.
What may seem like just another NEMA/IEC compliant motor, is actually much more. Techtop Motors designs top-grade squirrel-cage induction motors that have been fabricated according to industrial standards, for reliability, efficiency and security.
Utilizing new drive technology has enabled more applications for AC machines where DC machines have typically been used. In the past, DC machines have been implemented for their good torque characteristics throughout a variable speed range. However, some of these older DC drive systems are becoming obsolete and availability of replacement parts is becoming a concern. This sort of scenario will often be accompanied by a consideration for a drive retrofit project. This article covers some key points and comparisons between the two different technologies that may help make that decision a bit easier.
There's a common belief that two servos with the same power range from different manufacturers are roughly equivalent, and that the only other significant comparison point is price. This just isn't true, and the information provided below will debunk that belief. There are several important features you cannot afford to ignore when comparing servo motors, including:
What else can a servo motor do?
In Servo Motors: An In-Depth Introduction, Part 1, we reviewed how servo motor construction and operating characteristics create this technology's advantages. But there's more to understanding how servo motors can play an important role in automation solutions. Shaft sensors and holding brakes provide 4 different kinds of feedback and can extend the life of the equipment for maximum efficiency.
What is a servo motor, and what are they used for?
A servo drive system breaks down into two main components: the servo motor and a servo drive. The servo drive converts electrical power from the connected line supply in a controlled manner into power for the motor. The servo drive consists of power electronics and control electronics for regulation, set point generation, and component monitoring.
The servo motor converts the electrical power into movement. It consists of torque generating components, the sensor for angle and feedback and, in some cases, a holding brake to maintain position at zero current. Generally, the operation of servo motors is characterized by frequent changes in speed and torque, operation at standstill to hold positions, and short-term operation with high overloads.
To understand the advantages of a servo motor, let's consider the inner workings: construction, operating characteristics, sensors, and brakes.