Electric motors
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Electric motors

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Electric motors Electric motors Presentation Transcript

  • ELECTRIC MOTORS An Introduction to DC and Stepper Motors
  • Electric Motors
    • Electric motors are everywhere!
    • In your house, almost every mechanical movement that you see around you is caused by an AC or DC electric motor.
  • Direct Current Motors
    • overall plan of a simple 2-pole DC electric motor
    • A simple motor has 6 parts, as shown in the diagram
  • Direct Current Motors
  • Direct Current Motors
  • Brushed DC Motor
    • The brushed DC motor is one of the earliest electric motor designs
    • Easy to understand design
    • Easy to control speed
  • DC STEPPER MOTORS
    • Stepping motors are electric motors without commutators
    • Commutation is handled externally by the motor controller
    • Controller charges opposite coils attracting the center rotor magnets
  • DC STEPPER MOTORS
  • DC STEPPER MOTORS
    • Voltage Rating
      • provides desired torque
    • Resistance-per-winding determines
      • the current draw of the motor
      • Maximum operating speed
    • Degrees per Step
      • Sets the number of degrees the shaft will rotate for each full step
  • UNIPOLAR STEPPER MOTOR
    • Relatively easy to control
    • simple 1-of-'n' counter circuit can generate the proper stepping sequence
    • 1 transistor per winding
  • UNIPOLAR STEPPER MOTOR
    • two center-tapped coils
    • represents the connection of a 4 -phase unipolar stepper motor
    1 2 1a 1b 2a 2b 2a 1b
  • UNIPOLAR STEPPER MOTOR
    • 6 wires with a center tap on each of two coils
  • IDENTIFYING WIRES
    • Check make and model to see if wire colour code is available
    • Observe the wires to see if you can identify groups of 3 wires
    • Measure resistance between wires
    • Wire with lowest resistance is power wire
  • IDENTIFYING WIRES
    • 6 wire motors
      • Groups of 3 wires
      • 1 power & 2 signal
    • 5 wire motors
      • 1 power & 4 signal wires
    • power wire has lowest resistance to the others
  • CONTROL PROGRAM
    • Once wires identified and connected to the circuit: a program is needed to run the motor
    • Example Turing Program:
        • loop
        • parallelput (1)
        • delay (500)
        • parallelput (2)
        • delay (500)
        • parallelput (4)
        • delay (500)
        • parallelput (8)
        • delay (500)
        • end loop
  • STEPPER MOTOR CONTROL
    • 4 signal wires fired in the correct sequence will turn the motor