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Introduction To Motor Control
There are many types of motors that are in used these days. The common ones are DC types, AC types, stepper motors and brushless DC motors.
In the electronics hobbyiest projects, most designer will likely to encounter the use of stepper motor as this is the most widely used in many applications. There are basically 2 types of stepper motor namely unipolar type and bipolar type.
Bipolar motors have two coils and are controlled by changing the direction of the current flow through the coils in the proper sequence. These motors have only four wires.
Unipolar motors have two center-tapped coils which are treated as four coils. These motors can have five, six or eight wires. Unipolar motors may be connect as bipolar ones by not using the ‘+’ wires.
There are also servo motors which are frequently used in remote control aeroplanes, remote control toys and in automation processes. They are controlled using pulse coded modulation.
