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Motion Control Tips

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FAQs + basics

What are breakpoints and how are they used in motion control?

May 12, 2021 By Danielle Collins Leave a Comment

breakpoint

In computer programs, breakpoints are functions within the code that help with monitoring and debugging the program. The programmer can mark, or flag, a line of code as a breakpoint, and when the program encounters the breakpoint marker, it pauses before executing that line of code. This allows the programmer to inspect variables, I/O status, […]

Filed Under: Controls, FAQs + basics, Featured

What’s the difference between NEMA and IEC motor starters?

May 7, 2021 By Danielle Collins Leave a Comment

difference between NEMA and IEC motor starter

A motor starter is a device that controls power to a motor for starting, stopping, reversing, and in some cases, protecting the motor from overload current. Although sometimes referred to as contactors, motor starters actually consist of a contactor and a thermal overload relay. The contactor is an electromechanical device based on a coil and […]

Filed Under: AC Motors, FAQs + basics, Featured

What are eddy currents and how do they affect motor performance?

April 29, 2021 By Danielle Collins Leave a Comment

eddy currents

One of the electromagnetic principles that governs the operation of an electric motor is Faraday’s law, which states that when the magnetic environment of a coil of wire is changed — whether by moving the magnet and coil relative to each other or by changing the magnetic field — a voltage, or electromotive force (EMF), will […]

Filed Under: AC Motors, Brushless Motors, DC Motors, FAQs + basics, Featured, Motors, Servo Motors, Stepper Motors

What are inductive encoders and how do they differ from resolvers and LVDTs?

April 20, 2021 By Danielle Collins Leave a Comment

inductive encoders

Position measuring devices that rely on the principle of mutual induction include resolvers, linear variable differential transformers (LVDTs), and inductive encoders. Two of these technologies — resolvers and LVDTs — are based on the construction and operation of a transformer. In the case of an LVDT, voltage is applied to a primary winding and induced in […]

Filed Under: Encoders, FAQs + basics, Featured

What are double- and triple-stack hybrid stepper motors ?

April 13, 2021 By Danielle Collins Leave a Comment

Of the three primary stepper motor designs — permanent magnet, variable reluctance, and hybrid — hybrid stepper motors are arguably the most popular in industrial applications, combining the best performance characteristics of permanent magnet and variable reluctance types. Hybrid stepper motors are constructed with a rotor made of two sections, or cups, with a permanent […]

Filed Under: FAQs + basics, Featured, Industry News, Stepper Motors

What are different ways to express a gear ratio?

April 9, 2021 By Danielle Collins Leave a Comment

gear ratio

In motion control systems, gears are used to change the torque and speed delivered by a motor to a driven component. Depending on how the gears are arranged, they can either increase the delivered torque and decrease the output speed (the most common arrangement in motion control applications) or decrease the delivered torque and increase […]

Filed Under: FAQs + basics, Featured, Gears + Gearing

Absolute encoder interfaces: Differences between SSI, BiSS, Hiperface, and EnDat

April 2, 2021 By Danielle Collins Leave a Comment

absolute encoder interfaces

Absolute encoders can communicate with controllers through parallel or serial wiring, over a fieldbus, or via an Ethernet-based protocol such as EtherCAT. Of these options, serial communication is a simpler solution than parallel wiring (which requires a twisted pair of wires for each bit of output) and is well-suited for applications that aren’t complex enough […]

Filed Under: Absolute Encoders, Encoders, FAQs + basics, Featured

What are multi-stage gearboxes and when are they used?

March 29, 2021 By Danielle Collins Leave a Comment

multi-stage gearboxes

Gearboxes are commonly used in motion control applications to change the output speed and torque from a motor to a driven component. By using a smaller gear with fewer teeth (commonly referred to as a pinion) to drive a larger gear with a higher number of teeth, the torque delivered to the load is increased while […]

Filed Under: FAQs + basics, Featured, Gears + Gearing

What is a tachogenerator and when is it used?

March 15, 2021 By Danielle Collins Leave a Comment

DC tachogenerator

There are several ways to measure the position of a rotary axis, and some position measuring devices, such as incremental and absolute encoders, can also derive the speed of the axis by evaluating a combination of distance, time, and pulses. But for applications that require only speed measurement — without position information — a tachogenerator may […]

Filed Under: Encoders, FAQs + basics, Featured

What are radial and axial runout and how do they affect rotary tables and stages?

March 8, 2021 By Danielle Collins Leave a Comment

rotary actuator sizing

Runout is a dimensional specification that defines error in the motion of a surface as it moves relative to a datum. The official geometric dimensioning and tolerancing (GD&T) definition of runout applies to the variation of a circular feature — such as a shaft or spindle — as it rotates over 360 degrees, although the term […]

Filed Under: FAQs + basics, Featured, Rotary Tables

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