OTHER SUPERIOR PRODUCTS

SIMILAR PRODUCTS

In past chapters we’ve looked at powering robots using everyday continuous DC motors. DC motors are cheap, deliver a lot of torque for their size, and are easily adaptable to a variety of robot designs. By their nature, however, the common DC motor is rather imprecise.
Without a servo feedback mechanism or tachometer, there’s no telling how fast a DC motor is turning. Furthermore, it’s difficult to command the motor to turn a specific number of revolutions, let alone a fraction of a revolution. Yet this is exactly the kind of precision
robotics work, particularly arm designs, often requires.

Enter the stepper motor. Stepper motors are, in effect, DC motors with a twist. Instead of being powered by a continuous flow of current, as with regular DC motors, they are driven by pulses of electricity. Each pulse drives the shaft of the motor a little bit. The more pulses that are fed to the motor, the more the shaft turns. As such, stepper motors are inherently “digital” devices, a fact that will come in handy when you want to control your robot by computer. By the way, there are AC stepper motors as well, but they aren’t really suitable
for robotics work and so won’t be discussed here.

Stepper motors aren’t as easy to use as standard DC motors, however, and they’re both harder to get and more expensive. But for the applications that require them, stepper motors can solve a lot of problems with a minimum of fuss. Let’s take a closer look at steppers and learn how to apply them to your robot designs.

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