No, This is beyond what I expected.I don't know if all your questions can be answered in a single forum post. There is a strong analogy between mechanical systems called "spring-mass-damper" and electronic systems consisting of resistors, inductors, and capacitors. Both systems are governed by a 2nd order differential equation that has solutions which are identical in form. These solutions are characterized according to whether the transient response includes damped oscillations or not. In this context a time constant it the amount of time required for an exponential solution to go from a value \(e^0 = 1\) to a value of \(e^{-1}= 0.367\). Does that help?
Thank you.Mechanical time constants will involve mass or moment of inertia, the spring constant, and the dashpot constant. Electrical time constants will involve resistance in Ohms, inductance in Henrys, and capacitance in Farads.
The basic principle of a tachometer is to measure the rotational speed of a shaft. In the case of a vehicle this would be the crankshaft. A megnetic pickup or hall effect sensor can detect the presence or absence of a magnet and count revolutions. It is not much more complicated than that.
There are a few types, DC which is a simple DC brushed generator, AC which truly AC would be on the lines of a Resolver, which does not posses a permanent magnet, there is also a Pulse generator, this can be magnetic or optical, which is some times referred to as AC, all are used as feedback devices.Thank you.
What is the different between AC and DC Tachometers( permanent magnet and inductive ) ?
by Duane Benson
by Jake Hertz
by Jake Hertz