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<\/a>Bridge Rectifier<\/p><\/div>\n
Our assignment was to apply a reversed dc permanent magnet motor generator to something, so to create something you can manually power.<\/p>\n
I decided to use a roll up shade. In our classroom there are very large shades that are open and closed by pulling on a circular chain. Therefore the power is transferred from the spinning rod to the vertical chain going up and down, which means that by a simple pull of the chain the rod will spin very quickly.<\/p>\n
I used a tape player, because in the play position it is always on. It is really easy to make a tape player play and stop by adding and removing power. With the curtain I was able to produce just the right amount of power, so that while the curtain was being taken up or lowered, Let it Be would play.<\/p>\n
Probably the most interesting thing I learned in this class is that a motor is a generator in reverse. For example, a DC permanent magnet motor turns as a result of permanent magnets repelling and attracting the router coil – an electromagnet created by winding a powered coil around a piece of metal and infusing it with the energy of the battery. If you reverse the poles of the battery the motor will spin in the opposite direction.<\/p>\n
If you were to take the motor and spin the part that is generally spinning, the reaction happens in reverse, and power is released through the wires usually going to a battery. Reversing the direction of the spin switches the poles (negative\/positive). If you are powering something and you want it to work when the motor spins in either direction, as was the case in my project, you would want to include a bridge rectifier, also used to convert ac to dc power, to redirect the current and keeps it flowing in one direction.<\/p>\n