The DC motor is a rotating electric machine designed to operate from source of direct voltage
, and the basic type is a permanent magnet DC motor. Two other types of DC motors are series wound and shunt wound DC motors. These motors also use a similar rotor with brushes and a commutator. However, the stator uses windings instead of permanent magnets.
A series wound DC motor has the stator windings in series with the rotor. A shunt wound DC motor has the stator windings in parallel with the rotor winding. A series wound motor is also called a universal motor, and it is universal in the sense that it will run equally well using either an AC or a DC voltage source. DC motors are controlled by an H-bridge consisting of four power switches which enables you to adjust the motor voltage and polarity using the Pulse Width Modulation (PWM) technique to control speed and direction.
For many engineers, the process of tuning a servomotor is a mysterious black art. But the procedure needn't be painful. Just a modest amount of knowledge can bring familiarity with some of the standard techniques and add consistency to what can otherwise be a hit-or-miss process.
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