What is meant by damping torque?
Damping torque or damping forces is the speed deviation of an electromechanical torque deviations of a machine while the angle deviation is called synchronizing torque [1]. If the damping force is too large, then the pointer will come to rest slowly and this is called as over damping.
What is damping torque & how it is classified?
The damping torque is proportional to the speed of rotation of the moving system, that is Tv = kv d dt θ Damping Torque. We have already seen that the moving system of the instrument will tend to move under the action of the deflecting torque.
How is damping torque achieved?
A damping torque is produced by a damping or stopping force which acts on the moving system only when it is moving and always opposes its motion. Such a torque is necessary to bring the pointer to rest quickly.
What is the purpose of damping torque in Pmmc meter?
Damping – The damping torque is used for keeping the movement of the coil in rest. This damping torque is induced because of the movement of the aluminium core which is moving between the poles of the permanent magnet.
What are the three types of damping?
Damping & types
- Damping Ashlin T V.
- Damping It is the dissipation of energy from a vibrating structure.
- Types of Damping 1) Viscous damping 2) Coulomb or dry friction damping 3) Material or solid or hysteretic damping 4) Magnetic damping.
Why is damping important?
Damping is a way to limit vibrations and is essential for protecting the system in which it operates. This is what happens with door or drawer springs, where damping prevents blows when opened/closed, preserving them and protecting the system.
Which damping is most efficient?
Eddy current damping is the most efficient form of damping.
When damping torque is more than the optimum the instrument will become?
15. When the damping force is more than the optimum, the instrument will become. (d) fast and sensitive.
What is controlling and damping torque?
Damping force or Damping Torque: This force is necessary to bring the pointer to rest in its final deflected position quickly. Without such damping, the combination of deflecting torque and controlling torque makes the pointer to oscillate about its final deflected position for some time.
Why is damping necessary?
What are the 4 types of damping?
What is the purpose of damping the torque?
Damping torque is a physical process of controlling a system’s movement through producing motion that opposes the natural oscillation of a system. Similar to friction, it only acts when a system is in motion, and is not present if the system is at rest. Its primary purpose is to enable fast and accurate readings for an oscillating system.
What does it mean when an instrument has too much damping?
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.
How does eddy current damping torque work on a pointer?
As the pointer moves, the disc cuts across the magnetic field and eddy currents are induced in the disc. These eddy currents react with the field of the magnet to produce a force which opposes the motion according to Lenz’s Law. In this way, eddy current damping torque reduces the oscillations of the pointer.
What is the damping ratio of an underdamped system?
Underdamped systems have a value of less than one. Critically damped systems have a damping ratio of exactly 1, or at least very close to it. The damping ratio provides a mathematical means of expressing the level of damping in a system relative to critical damping.