![]() The cookie is used to store the user consent for the cookies in the category "Analytics". This cookie is set by GDPR Cookie Consent plugin. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. The AGVs at the Martorell factory follow 40 guide paths set out with magnetic tracks embedded in the floor.Įach route lasts between 1 and 7 minutes.ĭuring this time, the robots follow the steering circuits and automatically reduce their speed in curves so they do not lose stability when carrying heavy loads and are able to maintain a safety distance.įive employees configure, and if necessary, remotely modify the path settings of all the AGVs from a control room.Ī centralised server gathers information from the software installed in each robot, and their exact position is displayed with a numerical symbol on the screens in the room.Ĭonnectivity technologies of the so-called fourth industrial revolution – often referred to as Industry 4.0 – enables workers to control processes to optimise decision-making and let these collaborative robots perform the most physical and repetitive tasks, says Seat. When following their pre-set paths they know when to stop at a red light or when a worker crosses their path thanks to their 360° perimeter vision. The AGVs travel more than 436,000 km every year, the same distance as from Earth to the moonĮvery year, the AGVs travel over 436,000 km, which is more than the distance between Earth and the Moon. The automatic robots transport engines, gearboxes, shock absorbers or door windows, and their individual payload is up to 1,500 kg in weight. This is how some of the 125 AGVs begin their day, routinely crossing paths with each other and with the 7,000 factory workers in what appears to be a fully synchronised dance performance. They scan a barcode to make sure they transport the right part, and a sensor then opens the warehouse door so they can follow their circuit. Seat explains how these mobile robots work. It belongs to one of the 125 robots that begins its route in one of the workshops at the Seat factory in Martorell, where it makes up to 2,800 rounds every day. They’re not much good at conversation, but sometimes you just want a bit of peace and quiet anyway.Ī blue light goes on at 5 o’clock in the morning in the engines warehouse. The company describes a typical working day with the robots as colleagues. The work performed by AGVs in the SEAT factory reduces production time by 25 per cent Most often just testing the motor for a couple hours in a real environment is the best indicator of success.The robot-based transportation system eases and optimises factory workers’ jobs and reduces production time by 25 per cent, says Seat. ![]() In fact, even a 50% duty might work, but that is getting closer to the thermal edge.įor applications that do not have a lot of margin, a proper thermal simulation is necessary that considers the ambient temperature, the cooling situation, the motor's thermal time constant, etc. Now with 35% above rated current for the "on" times and 50% below rated current for the "off" times, the short 12mm motor will not have a problem in this application running a 25% duty cycle (given standard ambient temperatures). A stepper (unlike a BLDC) consumes power even when it is not active, so count on the "off" parts of the duty cycle burning 50% of the rated current. However, we can't rely on this number alone to determine the allowable duty cycle. A 16% higher current here will lead to 35% higher heat generation. The heat lost is current squared times resistance. Let's take a look at a rough way to estimate this. In this case, the application has a 25% duty cycle (spends three quarters of the time off), so maybe this will work after all. The problem with boosting the current is overheating. But if we boost the current 50%, then the short motor works. The short 12mm version of that same motor is just shy of that performance point. In the example below, the 20mm long motor's torque/speed curve (red) can easily meet the application requirement (purple triangle). ![]() ![]() Sizing a stepper motor based only on the standard torque/speed curve may mean you are leaving some performance (and cost) on the table.
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