Actuator is the component of the bot that is converting our signals into motion Form of instruction to botsElectrical signals Actuator converts these signals to motion of the bot Actuator Examples ID: 724696
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Slide1
DC Motors Slide2
What is an Actuator??
Actuator is the component of the bot that is converting our signals into motion.
Form of instruction to bots:Electrical signals.
Actuator converts these signals to motion of the bot.Slide3
Actuator
Examples:
Electrical
motor, actuators,
hydraulic
pistons,
relays, comb drives, piezoelectric actuators, thermal bimorphs, digital micromirror
devices and
electroactive
polymers etc.
Efficiency defines the usefulness of any actuating mechanism.Slide4
MotorsSlide5
DC Motors
DC motors are low torque and high speed devices
The movement of shaft is smooth
Easiest to Operate
Gears can be used to increase the torque at the cost of speed.Slide6
DC Motors: Construction & Characteristics
Run on DC Power Supply
Can Rotate in both directions
To handle one has to control the speedSlide7
DC Motor : Advantages Disadvantages
Advantages:
Easy to Operate.
Cheaper and easily available
Disadvantages:
Precise
control of this motor
is difficult
Has a low life-span
.Slide8
Stepper Motor
More precise than DC Motor
Measured rotation and can be held at a particular position- U can rotate the stepper motor with an accuracy of 0.9 degree .
Alignment is much better.Slide9
Stepper MotorSlide10
Operating Conditions For a Motor
Voltage:
Thumb Rule:
Higher
the voltage,
higher the
torque!!
Always apply
closer to
the rated voltage.
If very
less,it
won’t work.
If very high ,coils will melt .Slide11
Operating Conditions For a Motor
Current:
Two types of current to be considered:
Operating
Current:Average
amount of current drawn by motor under normal torque conditions.
Stall Current : Maximum amount of current the motor will drew under abnormal torque conditions Slide12
Operating Conditions For a Motor
Current(contd..)
Your motor should be operated at the operating current and circuit should be designed to withstand the stall current.
In Constantly running
systems,it
is
advised
to use the heat sink.Slide13
Operating Conditions For a Motor
Power Rating:
Power(Watts)=Voltage*Current
Power generated is the reason of melting of coils at high voltage and high current operating conditions.
Other:
Torque,Velocity
and other factors must be considered which varies with requirement.