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10. Advanced Techniques > All About Motors

All About Motors

Next, let’s discuss motors. You’ll find yourselves using motors all the time if you dabble in robotics, so you might as well learn all you can about them!

There are a variety of motors you may encounter working with hobbyist electronics. The three main motor types you’ll find are DC brushed motors, stepper motors, and hobby servo motors. With the exception of many servo motors, you can’t just hook a motor up to an Arduino. The other motors take more current than an Arduino can source from a pin.

DC Brushed Motors

DC brushed motors (Figure 10-9) are great for providing motion without precision. These motors come in all shapes and sizes. They have two terminals. When you put a voltage across the two terminals, the shaft spins. A higher voltage speeds it up and a lower voltage slows it down—with limits. Giving it more voltage than it’s rated for can damage it, and there’s a minimum voltage where it won’t spin as well. Make sure to check the motor’s datasheet to find these numbers. You can usually find a datasheet on the same website you bought the motor from.


  

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