Welcome to Eton's motor control 101. The first topic we'll be discussing is what controls a motor. Now, way back in the day when people were just learning how to harness the power of electricity, the three-phase AC motor was invented by this guy. With this new motor, they needed a way to turn it on and off, so they created this thing called a knife switch. When an operator grabbed the handle, he would move it from one side to the other, connecting the motor to power. However, this wasn't particularly safe for the operator, as arcs formed at the contacts when the switch was almost closed, which could injure the operator. Ouch! They realized that this solution was flawed, so they decided to put the switch inside an enclosure to protect the operator. They put a handle on the outside so they could turn on and off the motor, and the arcs were contained inside the enclosure. So, what's the problem with this? Well, you need someone to physically operate the switch. If you have 40 motors spread around your plant, you'll need an operator with great endurance to run all over the plant to operate those motors. Clearly, that isn't feasible for many applications. That's why they invented something called a contactor. Inside the contactor, there is a coil of wire wrapped around a piece of metal. Above that piece of metal, there's another piece of metal attached to an electrical bridge, which connects contacts on one side to the other side. This top portion, the metal attached to the electrical bridge, is called an armature. When an electric current is applied through the coil of wire, the bottom piece of metal becomes a magnet (an electromagnet, to be precise). This electromagnet attracts the top piece of metal,...
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