Neodymium magnets are a permanent magnet made from an alloy of neodymium, iron and boron (Nd2Fe14B). The tetragonal crystalline structure gives the magnet a high resistance to being demagnetized. They were developed in 1982, by GM and Sumitomo Special Metals. Sumitomo developed the sintered neodymium magnet and eventually became part of Hitachi family of companies. There are several grades of Neodymium magnets. The grade is two numbers followed by letters. The numbers represent the magnetic strength and the letters represent the maximum operating temperatures. Most of my neodymium magnets are grade 40 and have a maximum operating temperature of 80 degrees Celsius or 176 degrees Fahrenheit. Because sintered neodymium alloy is highly susceptible to corrosion they are generally plated in nickel-copper-nickel coating for a shiny corrosion resistant finish. I know this is all great right but whats the big deal? Well the world would not be the same with out neodymium magnets. They are heavily used in the computer industry in hard disk drives.
Advances in smaller drives that eventually went into laptops were largely made possible by neodymium magnets. Neodymium magnets are also used in Guitar pickups, magnetic door locks, MRI’s (Magnetic resonance imaging), Cordless drill’s, wind turbines, and Motors of all sorts, even the prius has neodymium magnets in its drive motors. They come in all shapes and sizes. Everything from small button magnets to keep cabinet doors closed to cubes, and large rods. This small neodymium magnet has about 3 pounds of pull force. This half inch by half inch neodymium cube has the pull force of around 24 pounds. This larger grade N40 neodymium rod has about 28 pounds of pull force. These magnets are certainly very interesting and have a lot of uses in experiments and also in practical applications but they can also be very powerful and certainly can be dangerous. They can attract each other from several inches away and even shatter upon impact. Extreme caution should be observed.
Beyond the danger that they can pose to you they can also cause damage to your electronic devices. So again caution should be observed. For some fun drop a neodymium magnet down through a section of copper pipe. neodymium magnets will produce eddy currents when dropped down a section of pipe that will cause the magnet to tumble and slow its fall down the pipe. The best results will be if you use thick walled pipe like schedule L and a magnet that is cube shaped that has enough room to tumble. When a the neodymium magnet falls down the length of pipe, the changing magnetic field created by the falling magnet pushes electrons in the metal tube around in a circular movement. These eddy currents have their own magnetic field which is then perpendicular to that of the magnet which therefore opposes the fall of the magnet. The magnet falls dramatically slower than it does in ordinary free fall If you want to read more on this phenomenon you can look up Lenz’s Law New (7) from $6.21
Ships from and sold by Summer Online-HK. Specifications for this item 0837L DC 12V 8W Open Frame Type Solenoid for Electric Door Lock uxcell DC 12V Open Frame Type Solenoid for Electric Door Lock FREE Shipping on orders over . DetailsDocooler RFID Proximity Door Entry Access Control System + 10 Key Fobs (Style 1) FREE Shipping on orders over . Product Name : Door Solenoid;Material : Metal, Electronic Parts;Color : Silver Tone Rated Voltage : DC 12V;Rated Stroke & Force : 10mm, 50gMounting Hole Size : 6.8 x 3mm/0.26" x 0.12"(L*W) Total Size : 6.6 x 4 x 2.7cm/2.6'' x 1.5'' x 1''(L*W*H);Cable Length : 24cm/9.4'' Net Weight : 147g;Package Content : 1 x Door Solenoid Electromagnet Designed with the open frame type and mount board, high power. Easy to install for the electric door lock or other automatic door lock systems with the mounting board. Shipping Weight: 5.6 ounces (View shipping rates and policies) Amazon Best Sellers Rank: #35,937 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
in Industrial & Scientific > Industrial Electrical > Controls & Indicators > Solenoids See questions and answers 5 star41%4 star29%3 star18%2 star6%1 star6%See all verified purchase reviewsTop Customer ReviewsPerfect for my project(s)lower your expectationsNo rotating in housing possible, Well madeGood quality but annoying design...Works wellGood lock, bought for the wrong purposeGreat product for price. Most Recent Customer ReviewsSearch Customer ReviewsIf you’re looking for inspiration for your first Raspberry Pi project, look no further than the several dozen projects entered in the first ever Raspberry Pi Design Contest, sponsored by MCM Electronics. All the projects were entered into one of four categories – Artistic, Educational, Enclosure, and Utility – and are now competing for five prize packs, including a Printrbot Jr. 3D printer to be awarded to the grand prize winner. It’s been just over one year since the initial release of this single-board computer, and already makers have made some incredible projects with it.
The Pi is the brain behind multiple home security systems; it is responsible for collecting and displaying data; the Pi has been used as an educational tool for music, mathematics, and geography, among other subjects; artists are building interactive and crowd-sourced installations; enclosures for the Pi range from simple to complex, with all-in-ones emerging as a sub-genre all their own; the Pi can control and automate various systems around the home or office. Judges are now reviewing these projects based on their documentation, project success, and unique application. The winners will be announced on or before April 25th. Good luck to all participating makers, and click the button below to view all the projects and their descriptions. Links to each entry can be found after their description if you want to read up more on a specific project. UPDATE: The Winners have been announced – click here to see the winners! Send this to friendYour emailRecipient email…remote door (garage gate) upon your departure.