What is Electromechanical Chopper?:

Electromechanical Chopper – An ac amplifier must see ac in order to perform useful work. A fair number of chopping and modulation techniques are available to change direct current, or to change very slowly varying signals into square waves (or pulses). Associated circuitry, inserted at the amplification system common output, may then be used to rectifier or demodulate the carrier wave and thereby produce a common dc product.

Electromechanical Chopper

Small dc increments are converted to pulses, suitable for amplification in high gain ac stages, in an electromechanical chopper shown in Fig. 14.29. The device is basically identical to the well known dc (vibrator) chopper.

The chopper is usually driven by a medium frequency oscillator, with drive frequencies for the coil between 50-400 Hz or more. High quality choppers handle voltages as high as 100 V, and voltages in the microvolt range. Most contacts are composed of similar metals and carry a maximum current of 2 mA. The approximate life is about 5000 hours.

Related posts:

  1. Principle of Electromechanical Energy Conversion
  2. Electromechanical Energy Conversion via Electric Field Energy
  3. Dynamical Equations of Electromechanical Systems
  4. Electromechanical AD Converter
  5. Electromechanical Breakdown
  6. Chopper type DC Amplifier Voltmeter (Microvoltmeter)
  7. Chopper Type DC Amplifier
  8. Self Oscillating Converter (Transistorized Chopper Circuit)
  9. Transistor Chopper Circuit
  10. Synchronous Vibrator and Synchronous Chopper
  11. DC Chopper
  12. Chopper Circuit with Input Inductance
  13. Performance of Chopper in Steady State Condition
  14. Methods of Controlling Chopper Circuit
  15. Two Quadrant Chopper
  16. Chopper Resistance in the Rotor Circuit
  17. Chopper Fed DC Drives
  18. Chopper Control of Separately Excited DC Motor
  19. Load Commutated Chopper Circuit
  20. Difference between Converter Fed and Chopper Fed DC Drives