MOTORS

Types of motors AC motors DC motors DC geared motors Stepper motors Servo motors

AC motor These are the motors which convert alternating signal into rotational motion. Examples are the motor in water pumps, table fan, ceiling fan.

DC motor These are the motors which convert DC signals into rotational motion. In robotics applications they are preferred over AC motors as the motor and the complete circuit require same kind of supply i.e. DC supply.

DC geared motors These are the DC geared motors having external gear arrangement attached with motor. These are the motors that are most commonly used in robotics as they are having considerable torque.

Stepper motor A type of motor which takes DC pulse input and gives rotating motion in steps. They are of two types : Unipolar : which moves in one direction only. Bipolar : which moves in both directions.

Contd.... Stepper motor can be run using …. Single coil excitation (for clockwise motion) 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1

Contd.... Double coil excitation (for clockwise motion) 1 1 0 0 0 1 1 0 0 0 1 1 1 0 0 1

CONTROLLER CIRCUITS

For both way motion ( clockwise and anticlockwise ) of one DC motor, an “H-Bridge” can be employed. For both way motion of two DC motors “dual H-Bridge IC L293D” can be employed.

ONLY POSSIBLE SWITCHES SETTING FOR ROTATION S1-S4 ON, S2-S3 OFF (for one direction). S2-S3 ON and S1-S4 OFF (for other direction).

L293D motor driver IC

Circuit for controlling an AC or other high current devices using relays

Thank you