rdlc data matrix

rdlc data matrix

rdlc data matrix

rdlc data matrix

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Heat can destroy a motor in several ways Most lower-cost PMDC motors use ferrite magnets, which can become permanently demagnetized if they are overheated They can also be demagnetized by the magnetic fields produced when the motor is running at a voltage higher than that at which it is rated The flexible braided copper leads that feed current to the brushes (called shunts) can melt after just a few seconds of severe over-current demands The insulation on the heavy copper windings can fail, or the windings can even melt Depending on the motor brush mounting technique used, the springs used to keep the brushes on the commutator can heat up and lose their strength, thus causing the brushes to press less tightly against the commutator When this happens, the brushes can arc more, heat up, and finally disintegrate You don t want to use that expensive motor as a fuse, so make sure it can handle the heat 2 Motor heating is proportional to the current resistance Our 18-volt motor example has a resistance of 0174 ohms If you were to stall it, it would draw 103 amps If you stalled the same motor at 36 volts, it would draw 207 amps 2 Since heating is a function of current , the motor would get four times as hot Pushing 207 amps through a resistance of 174 ohms will generate 7,455 watts of heat, which is five times more than the heating output of a typical home electric space heater Now imagine all the power of your portable heater multiplied by five and concentrated into a lump of metal that weighs just a few pounds You can see why survival time is limited The physical size of the motor that would best fit your robotic needs is in large part determined by the amount of heat that will be generated Some people find it surprising that a 12-ounce motor can produce exactly the same amount of power as a 5-pound motor The same formula for motor power is just as true for small motors as it is for large motors The difference is in how long that power can be produced The larger motor has a larger thermal mass, and can therefore absorb a lot more heat energy for a given temperature rise.

21: Global Services Mobile Communications (GSM)

Remember that the tool used throughout this chapter is the Dashboard Designer, not the Scorecard Designer The reason for this is that scorecards are one of several possible elements that can be placed on a dashboard, and it is the dashboard that is ultimately viewable by end users The reason the dashboard is the element visible to end users is because a single dashboard might contain multiple scorecards, reports, strategy maps, or any combination of these elements Additionally, a dashboard might host a variety of scorecards and reports but have a single set of parameters that the user can change to modify all of the elements on the dashboard at once Take as an example the Product dimension If all scorecards and reports are created without any filtering, they are actually using all products and are thus showing totals for all products combined However, a product manager in charge of the Bikes line might want to filter out everything but bikes, while the product manager for Clothing and Accessories wants to examine those product lines Therefore, a drop-down could be added to the dashboard that would allow users to filter the data in all the scorecards, reports, and strategy maps on the dashboard at once

Okay, so you would like to use a greater-than-recommended voltage on your motor to get more power out of it, but you are worried about damaging it What should you do First, you must realize that you always run the risk of destroying your motor if you choose to boost its performance past the manufacturer s specifications Following are some things you can do to minimize the risk Limit the duty cycle If you run your motor for, say, 1 minute on and 5 minutes off, it should survive Cooling is critical for an overdriven motor One Robot Wars heavyweight (La Machine) cooled its over-volted motors by directing the output of a ducted fan into them This ducted fan was originally created for use in propulsion in model airplanes because they put out a lot of air An easier way to accomplish this same effect is to use batteries that are limited in the amount of current that they can produce The problem here, though, is that you will often be pushing your battery to output levels that will shorten its useful life Even the sealed lead-acid batteries can sometimes boil and leak under heavy loads

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