open loop

Articles About open loop


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1 Step vs. Servo - Selecting the Best (October 2018)

Over the many years, there have been many technical papers and articles about which motor is the best. The short and sweet answer is - let's talk about the application. More recently a number of papers and articles have appeared that compared each motor's advantages and disadvantages in generic or specific terms. Many times, the methods used to drive and control these motors are not completely described due to the many control schemes available for use. A few articles focus on just the open loop step motor and the closed loop servo motor advantages and disadvantages in a laundry list format. This article is attempting to "drill down" into the reasons why and to describe how it is done.

2 Transverse Magnet Flux AKA Hybrid Step Motor Driver Techniques (June 2020)

The transverse flux permanent magnet motor -- also known as a hybrid step motor or hybrid servo motor -- has a wide range of performances, depending upon how you drive these motors, and whether you operate them in open loop or one of the many variants of closed loop methods you use. In this third installment we will cover some of the many ways to drive these motors, as well as how these choices affect the performance of these motors.

3 The Hyperloop is Here - Sort of (September 2017)

It is unlikely the hyperloop will inspire Hollywood to start making films emulating the tried-but-true terror-on-a-train genre - a genre that includes many classics. But somehow titles like - Lady on a Hyperloop, Strangers on a Hyperloop, Murder on the Hyperloop Express, Throw Momma from the Hyperloop, The Great Hyperloop Robbery - just don't work. And you can forget about another venerable train travel tradition - the club car - given that you will probably reach your destination sooner than you can say "Jack on the rocks."

4 Closing the Loop around a Transverse Flux Hybrid Step Motor (August 2020)

Transverse magnetic flux motors -- also known as step motors -- become Hybrid Servos when you operate them closed loop. This is the same transformation that happens between running a 3-phase synchronous motor from line voltage as opposed to running it closed loop as a brushless servo. In the case of hybrid motors, there are many degrees of what is advertised as "closed loop," and thus significant differences in the performance improvements seen.

5 Ready for Some Hyper Loop de Loop (October 2013)

High-speed transit system the dreamwork of ideators or idiots?

6 Applying Open Gear Lubricants (February 2012)

When selecting an open gear lubricant for use in a particular application, the method of application used must be considered.

7 An Open-And-Shut Case: Greases for Gear Applications (September 2016)

For the lubrication of open gear drives used in different industrial applications such as cement and coal mills, rotary furnaces, or where the sealing conditions are difficult, semi-fluid greases are often used in preference to fluid oils. For girth gear applications the greases are used with a splash or spray lubrication system. The selection of such greases influences pitting lifetime and the load-carrying capacity of the gears, as well as wear behavior