Motion Control

Driving Auto Performance Through Lubricant Selection

Underhood temperatures are gradually rising as aerodynamics dictate tighter packaging and large engines are being replaced by smaller turbocharged and supercharged engines for improved fuel efficiency. With ambient temperatures under the hood exceeding 120 °C (248 °F), finding a lubricant that can withstand the high temperatures for an extended period of time is key.

Posted in: White Papers, Coatings & Adhesives

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DryLin® E7 plastic linear plain bearings versus PTFE-lined plain bearings

Linear plain bearings are becoming commonplace in today’s manufacturing industry. As technologies and material sciences have advanced, so have the capabilities of linear plain bearings, particularly those made of plastic, such as the DryLin® series of self-lubricating linear bearings from igus®. This whitepaper will compare how they outperform a competitive linear plain bearing technology, which uses a PTFE-based, bonded liner, in both wear and friction testing.

Posted in: White Papers

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Choosing the Right Potentiometer for Reliable Sensing

In today’s market, there are a variety of available types of position sensing systems. It is important to compare unique features to application needs in order to find the best fit. A potentiometer sensor is an electromechanical component that consists of a resistor where the voltage divider value can be measured at any position by means of sliding contacts between the applied voltage values. Physically, a potentiometer consists, at a minimum, of a resistance track, a collector track, and a sliding contact that can be moved along the resistance track by means of mechanics (Figure 1). The movement of the sliding contact can be rotatory (angle) or translational (path).

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Sense Element Pump Ripple Fatigue

Aerospace sensor technology is plagued by the balance between sensitivity and durability. As devices become more fragile in the pursuit of achieving higher accuracy they find themselves torn apart in the process. Hydra-Electric solves this using a special sense element of stainless steel construction capable of withstanding the harshest pressure spike environments without the use of a snubber. Using finite element analysis, it was revealed that near infinite fatigue life is achieved even in high pressure applications. This demonstrates the superiority of a stainless steel flexure sense element over conventional piezoresistive silicon (PRT).

Posted in: White Papers, Data Acquisition, Sensors

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Nonlinear Model Predictive Control

This whitepaper presents an automatic workflow for implementing Model Predictive Control (MPC) controllers. The process uses MapleSim to generate a model of the system, whose dynamic equations are then extracted using Maple. Next, Maple is used to formulate the MPC problem, and generate the solver, which it automatically converts into the C code of the MPC controller. The advantage of using Maple is that the required procedures and their corresponding derivatives are computed and optimized whenever there is a change in the dynamic equations. The use of Maple saves time, removes human error, and produces highly optimized controller code.

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Imitative Robotic Control: The Puppet Master

Automated systems can have a hard time completing complex tasks in a timely manner. When controlling a robot outside autonomous mode, a good control device needs to give the user full control of the system while enabling the mission to be completed in a quick, accurate, and efficient manner.

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Choosing the Right Drive Technology

Coming up with the right drive technology for an application often depends on the options available. Here are five of the most common drive configurations being used today, along with their benefits and drawbacks. Although there are a number of variations of drive technologies for motion applications, there are a few that are used for the majority of systems being built today. These most common drives do take a bit of understanding before applying.

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