## Monday, June 9, 2014

### Tachometer; Tachometer types; Tachometer applications

A tachometer is a device which can be used to quantify the revolution rate of any rotating object for example motor or a rotating shaft. It's whether they may be rotating in the ahead or astern way and can be used to estimate rate on board boats and it uses in the marine engineering discipline at the same time. In this post you'll understand the working principle.

Tachometers are used in all vehicles to measure speed of vehicle also tachometers are used in industry for synchronizing of the machines. There are following types of  tachometers are described as below:-

Mechanical Tachometers
Magnetic Tachometers
A.C. Tachometers
D.C. Tachometers

Mechanical Tachometer
As you are able to see below such a tachometer in the diagram is just a linkage of rotating shafts, rotating weights and equipment.

Mechanical tachometers use how the centrifugal force is determined by the speed of spinning and may be used to stretch or compress a spring that is mechanical. Vibrating reed, or a resonance, tachometer uses engine speed to be determined by a chain of tuned reeds by suggesting the machine's oscillation frequency.

These types of Tachometers are as Shown Above

Two primary drawbacks with this are that the weights that are mechanical have inertia and therefore not quite precise and second it doesn't give an indicator of the way of turning.

D.C. Tachometer
This is seen in the diagram and the essential magnetic flux is given by the permanent magnets for the functioning while the whirling movement is supplied by the input signal in the rotating shaft or motor whose rate must be quantified. DC Tachometer is equivalent to DC generator which generates DC signals which are used and processed for displaying the speed. DC Tachometers are also used in Industries for synchronization of machines i.e. for controlling the speed of whole machine.

Thus we see this device could be used as bridge as well on the control panel to tell responsibility officer or the duty engineer about direction and the rate of rotation.