The QTL-A motor series

Lunedì, 18 Novembre 2019

www.tecnotion.com

The QTL-A motor series

Tecnotion introduces a new series of torque motors at the SPS Smart Production Solutions fair. The QTL-A motor series is Tecnotion’s largest torque motor series up to date, yet very compact and thus a high torque density for the generated torque. The motor is now available for applications that have high torque and thermal management requirements.

The QTL-A motor series comes in four diameters (210-230-290-310 mm) and three heights (65-85-105 mm). They are available with or without a cooling ring. The motor features enhanced thermal management due to the cooling channels which allow it to run at a high continuous torque of up to 329 Nm even in combination with high duty cycles and dynamic movement profiles. The low stack height in combination with the diameter results in a high torque density.

The brushless QTL has a large inner diameter suitable to route multiple cables through, allowing flexibility in the application. It therefore suits a wide variety of markets including rotary indexing tables, printing, material handling, packaging and laser cutting.The largest motor in the 310 series can reach an ultimate torque of up 779 Nm. The maximum speed for the smallest motor in the 210 series is 779 rpm at 680 Volt DC.

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Reckon improves the reliability of its gearboxes with Romax Enduro

Martedì, 24 Settembre 2019

http://www.reckondrives.com/

Reckon improves the reliability of its gearboxes with Romax Enduro

Planetary gearboxes are called for in 2 different situations: as a one-to-one replacement for a competitor product or in a system newly developed by the customer. Recommending an alternative product for an existing application is an easy task, as our engineers know that their design can be depended on. Reckon gearboxes can replace competitor gearboxes of similar size and with a compatible interface without any risk. In the second case, when customers are designing new systems, it is our job to recommend a viable solution that will match all of the specifications. Customers expect manufacturers to submit a recommendation based on solid, reliable data.

Sizing from catalog data

From the customer’s point of view, sizing a gearbox using standard catalog ratings is often seen as imprecise and risky, and a growing number of engineers are questioning the validity of datasheet values. We personally believe that the recent improvements in some suppliers’ published product performance is intriguing and cannot be explained simply by better designs, materials, treatments or lubricants.

Explaining to our customer the reasons for the difference between our torque ratings and those of the competition is not easy: 10 different gear designers may give 10 different torque ratings for the same gearbox, as it depends on which norm (or which version of the norm) they are taking as a basis, the safety margin they choose to apply and the calculation scenario they decide to follow (speed, heat, value and location of the shaft loads). To answer the question, we would need to know how the data was calculated, which is not usually something explained in the catalogs. The gearbox with the highest torque rating is not necessarily the best. In fact, it might even mean that safety margins were ignored to generate more appealing data, a practice we see as misleading.

Even honest datasheet ratings in our industry might be based on norms that only consider the perfect conditions: where every part is ideally situated and manufactured, where the life of each individual component is not impacted by the functioning of other components inside and outside the gearbox and where radial loads on the shaft only damage the output bearings of the gearbox or the shaft itself. Real-life is a lot different, however.

Sizing based on real-life conditions

Sophisticated enough to take all of these parameters into account, Romax Enduro assesses real-life conditions more accurately than any other software we have ever used before. We can show how our products will behave in any application. Along with integrating most calculation norms, including the latest updates of ISO 6336-2:2006 for gear calculation and TS 16281:2008 for bearing calculation, English company Romax has gone one step further, working together with the most respected experts around the world to develop its own additional algorithms. Functions now available in Romax Enduro allow for increasing design reliability and make it possible to calculate the life of a complete gearbox with a great deal of precision, factoring in all aspects of real-life conditions. Using Romax, we can now estimate the life of each gearbox in our customer’s application, component by component, taking into account how one component affects another (Fig. 1) and, more importantly, counting the customer’s output element as a part of the system.

The following scenario is typical: In a rack and pinion transmission, the combined loads generated by the helical pinion are applied to the output shaft, bending it and tilting it around the output bearings, twisting the planet carrier – which compresses the ring gear onto the gears, the needles against the planets and the planets against the sun gear – and finally applying a radial load on the customer’s motor shaft! (Fig. 2 and 3) As a result, the sun gear is subjected to more than what the basic norms estimate (basic algorithms only give L10h results) and becomes the weak element in the system. Romax Enduro can determine the damage to each of these elements for us!

riduttori

The result of these calculations is clearly conservative when compared with standard datasheet ratings, since it also takes additional variables into account. In different applications and working conditions, the same gearbox can be rated at a certain torque value or only half of it. It is a fact, however, that shafts, bearings, planet carriers, gears, needles, axles, etc. all have their own levels of stiffness. Why would anyone want to trust catalog values that do not consider all of these variables?

Using Romax Enduro makes our recommendations more dependable and professional: We can now determine the difference in the lifetime of any internal element if a 25-tooth pinion is used instead of one with 20 teeth, as the resulting additional shaft torsion, flexion and tilt will reduce the size of the zone where force is transferred to the planets from the sun gear – or to the ring gear (the variable, designated as Khβ, is clearly shown in the results). Our engineers can demonstrate that a 160 Nm gearbox only functions like a 120 Nm gearbox if a spiral bevel gear is installed on its output shaft, as the radial and axial load generated by the bevel gear set will compress and deform the output bearings and tilt all of the internal components above this torque. We can also explain that adding 2 teeth to the pinion and increasing the ratio slightly will sometimes increase and sometimes decrease the overall life, depending on the initial ratio.

Since even the greatest products cannot perform well if poorly sized, we are eager to give our customers the right recommendations so that their applications will last as long and perform as well as they possibly can.

Martin Mijno - CEO di Reckon

Martin Mijno CEO and founder of RECKON DRIVES INTERNATIONAL SAS



More information at reckondrives.com

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SVTS A Series - Slip Ring with Optic Fibre

Merocledì, 20 Marzo 2019

www.servotecnica.com

Slip Ring con fibra ottica per applicazioni outdoor

Slip rings are used to transfer signals or electrical power from a fixed structure to a mobile one while allowing continuous rotation and thus preventing electrical cables being subjected to mechanical torsion. The standout feature of Servotecnica miniaturised slip rings is that they are lightweight and small, but without compromising their reliability, service life, or the quality of transmission. They have an outer diameter of as little as 5 mm, and can transmit up to 10 different electrical signals using teflon cables with silver alloy plated wires to increase their signal transmission power. The rings and brushes are in a gold alloy for low wear, as well as making them able to transmit even high frequency signals (up to 1 GHz) with complete stability.

To ensure that such a small component is mechanically robust enough for the application, the housing is made in stainless steel. They are also equipped with dual ball bearings to ensure that the brushes and rings are perfectly aligned and minimise resistant torque at speeds up to 100 rpm for smooth operation.

Our slip rings guarantee signal transmission even in very small footprint applications. They are particularly suited to use on robot arms, electric locks and micro cable winders, and offer excellent value for money.

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