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AC motors
DC motors
DC geared motors
Stepper motors
Servo motors
• These are the motors which convert
alternating signal into rotational motion.
• Examples are the motor in water pumps,
table fan, ceiling fan.
• 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.
• 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.
• 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)
1000
0100
0010
0001
Contd....
Double coil excitation (for clockwise
motion)
1100
0110
0011
1001
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.
S1-S4 ON, S2-S3
OFF (for one
direction).
S2-S3 ON and
S1-S4 OFF
(for other direction).