Accuracy and repeatability are standard specifications that describe how a linear motion system behaves along its travel and how closely it reaches the intended position. Resolution, on the other hand, is less often included in performance data for linear motion systems, but it can be equally important as accuracy and repeatability in some applications. In […]
New wireless RF remote control for actuators from Accu Tech USA
Accu Tech USA has released a new wireless key fob controller for their linear actuator product line. The plug-and-play radio frequency (RF) remote control kit includes a 2-button remote control and a remote receiver to efficiently convert a standard rod-style actuator to an actuator automated by remote control. This system is small in size and […]
What is microstepping?
What is microstepping? It is a method of controlling stepper motors, typically used to achieve higher resolution or smoother motion at low speeds. Stepper motors move in discreet steps, or fractions of a revolution. For example, a stepper motor with a 1.8 degree step angle will make 200 steps for every full revolution of the […]
PID design using frequency-domain methods
With motion control applications, a PID or proportional + integral + derivative controller is often implemented using tuning or by a trial-and-error process on the shop floor. But modeling of the motion control system allows analytical derivation of the PID controller terms. By Tom Radigan | Advanced Motion Concepts Inc. Modeling a motion control system […]
PI intros compact 6-axis motion controller for high-precision positioning
PI (Physik Instrumente) has released a new 6-axis servo motor controller, the C-884 DC. Most modern precision motion systems are driven by servo motors, because they provide high torque, fast acceleration, smooth motion with a wide dynamic speed range, and fast start stop performance. PI’s compact C-884 DC motion controller can run brushless servo motors […]
Defining the compliance of electromechanical linear actuators
Modern motion controllers with built-in frequency analyzers allow direct identification of electromechanical actuators … under load … subject to real-word conditions. That in turn may help designers improve stiffness and actuator performance — even to the point of getting higher servo bandwidth. By Leonid Gannel, Ph.D. • Servo engineer • Jabil Shemer Motion Frequency analyzers […]
What is a chopper drive for a stepper motor?
There are two primary types of drivers for stepper motors, constant voltage drives (also referred to as L/R drives), and constant current drives (also referred to as chopper drives). One difficulty with stepper motor operation is that the time constant (L/R) of the motor windings prevents current from increasing rapidly during pulses. This means that […]
Intelligrated automated palletizing for citrus packer a Top Supply Chain Project for 2017
Intelligrated — a North American-based automated material-handling provider — was recently listed on Supply & Demand Chain Executive’s 100 great supply chain projects for its Bee Sweet Citrus design work. Bee Sweet Citrus is an independent packer and shipper of California citrus to serve a market that stretches from Europe to Australia. Faced with rising […]
How to reduce jerk in linear motion systems
The most common move profiles for linear motion systems are trapezoidal and triangular. In a trapezoidal move profile, the system accelerates from zero to its maximum speed, travels at that speed for a specified time (or distance), and then decelerates to zero. Conversely, the triangular move profile accelerates from zero to maximum speed and then […]
Motion controller for linear and rotary air-bearing stages from PI
Air bearings provide advantages over mechanical bearings when frictionless vibration-free motion is required, highly constant velocity control is crucial, and when angular repeatability and geometric performance must be optimal. Nanopositioning industry leader PI (Physik Instrumente) L.P. has released a new high-performance motion control controller designed to handle 1, 2 or 4-axis of PIglide air bearing […]
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