DC Motors - PowerPoint PPT Presentation

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DC Motors

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  1. DC Motors

  2. 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. What is an Actuator??

  3. 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. Actuator

  4. Motors

  5. 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. DC Motors

  6. Run on DC Power Supply • Can Rotate in both directions • To handle one has to control the speed DC Motors: Construction & Characteristics

  7. Advantages: • Easy to Operate. • Cheaper and easily available Disadvantages: • Precise control of this motor is difficult • Has a low life-span. DC Motor : Advantages Disadvantages

  8. 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. Stepper Motor

  9. Stepper Motor

  10. 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 . Operating Conditions For a Motor

  11. 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 Operating Conditions For a Motor

  12. 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. Operating Conditions For a Motor

  13. 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. Operating Conditions For a Motor