Blog: General Motion Control

Linear Systems: Lead screws, Ball screws and Linear Slides

With this posting, we’ll begin a discussion about leadscrew/ball screw/linear slide systems. Picture a screw with a nut on it. No, no not a Walnut.  Sighhhh. OK then, picture a right-hand threaded 1/4-20 screw with a 1/4-20 nut threaded on to the screw. A 1/4-20 screw has an outside diameter or major diameter of 0.25” and the thread of the screw has 20 turns per inch. Thus, the name is a 1/4-20 screw. The valleys of the threads are cut into the screw’s shank and are referred to as the root diameter or the minor diameter.

Fundamentals of Motion Control

Recently I came across a simple infographic from Power Jack Motion that did a nice job of visualizing the difference between alternating current (ac) and direct current (dc) motors. This article will follow and present the information contained therein. What is Motion Control, Anyway? Motion Control is a sub-field of automation encompassing the systems or …

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Motor Stalls in Stepper Systems

In our last posting we established a number of good things about stepper motors and their controls: Small changes in the winding current can be controlled by using bipolar chopper drive. Torque is in a fairly linear relationship with the winding current

Electric Motors whitepaper

Electric motors, whether designed to operate on ac, dc, or both types of current, come in numerous shapes and sizes. All electric motors have one goal in common: to convert electrical energy into mechanical motion. Whether the application uses a general-purpose standardized electric motor or a motor intended for a specific task, the selection process must satisfy the dynamic …

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Bipolar chopper drive circuit

In today’s blog we’re going to examine a bipolar chopper drive, a common method for precision current control in stepper motors. The simplest way to take a look at its operation is by using a basic schematic of it.