Damping Systems

The damping torque should be of such a  magnitude that the pointer quickly comes to its final steady position, without overshooting. If the instrument is underdamped, the moving system will oscillate about the final steady position with a decreasing amplitude and will take some time before it comes to rest. When the moving system moves rapidly but smoothly to its dinal steady position, the instrument is said to be critically damped or dead beat. If the damping torque is more than what is required for critical damping, the instrument is said to be overdamped. In an overdamped instrument, the moving system moves slowly to its final steady position in a lethargic fashion. The readings are very tedious to take in this case.

the methods for producing damping torque are

(i) air friction damping

(ii) Fluid friction damping

(iii) Eddy current damping

(iv) Electromagnetic damping

1. Air friction damping:

2. Fluid friction damping:

3. Eddy current damping:

4. Electromagnetic damping:

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