In cars, they are often used for retracting, extending, and positioning electrically-powered side windows. Below, we look briefly at the features and uses of each type.īrushed DC motors, featuring simple design and easy control, are widely used to open and close disk trays. Motors differ according to their power type (AC or DC) and their method for generating rotation (Figure 2). Figure 1 illustrates the general principle of the brushed motor. The commutator and brushes are the key components distinguishing the brushed DC motor from other motor types. Power to the coils is supplied through fixed conductive brushes that make contact with a rotating commutator it is the rotation of the commutator that causes the reversal of the current through the coils. To maintain rotation, it is necessary to continually reverse the current-so that coil polarities will continually flip, causing the coils to continue “chasing” the unlike fixed poles. The current generates magnetic fields in the coils this causes the coil assembly to rotate, as each coil is pushed away from the like pole and pulled toward the unlike pole of the fixed field. In this type of motor, electrical current is passed through coils that are arranged within a fixed magnetic field. The simplest type of motor is the brushed DC motor. Motors exchange electrical energy to mechanical energy. So actuators and motors are among the devices that convert electrical signals into motion.
When engineers are faced with the challenge of designing electrical equipment to perform mechanical tasks, they might think about how electrical signals get converted to energy.
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