AC tachogenerator DC tachogenerator The AC tachogenerator is use to measure speed only in one direction only. The DC tachogenerator is. A.C. Tachogenerator • 2. D.C. Tachogenerator; 6. CONSTRUCTION • An Armature is rotating type & this magnet is fixed type. • Armature is. The DC tachometer works on the principle that when the closed conductor moves in the The drag cup Tachogenerator generates the ripple free output voltage.

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These variations are usually amply documented in the manufacturer data sheets and do not present a problem.


The magnitude of the induced emf is proportional to the shaft speed. Although a voltage divider could theoretically be used with a tachogenerator to extend the measurable speed range in the volt scale, it is not theoory to significantly overspeed a precision instrument like this, or its life will be shortened.

C tachogenerator is shown in below figure. In the tachogenerator case the magnetic flux density B and the loop length l are constants, so the output voltage V o is proportional to the shaft thepry velocity W, as required and a shown previously in eqn 1.

Figure 1 Typical transfer characteristic of tachogenerator. I have prepared a list of instrumentation and control engineering based companies in India, which you should must know.

Depends on the natures of the induced voltage the electrical tachometer is categorized into two types.


The polarity of the induces voltage determines the direction of motion of the shaft. The rotation induces the emf in the coil. The polarity of output voltage indicates the direction of rotation. The commutator collects current from armature conductors and converts internally induced a.


The AC tachometer generator designs for reducing the problems. The resistance is connected in series with the voltmeter for controlling the heavy current tachogejerator the armature.

Tachogenerators are frequently used to measure the speeds of electric motors, engines, and the equipment they power: The DC tachometer works on the principle that when the closed conductor moves in the magnetic field, EMF induces in the conductor.

One of the more common voltage signal ranges used with tachogenerators is 0 to 10 volts.

What is Electrical Tachometer? – DC & AC Tachometer Generator – Circuit Globe

Circuit Globe All about Electrical and Electronics. The machine whose speed is to be measured is coupled with the shaft of the DC tachometer generator.

Advertise with Ads Link x Thelry under the terms and conditions of the Design Science License. Figure 2 Tachogenerator equivalent circuit. Hot Wire Anemometer Thermal Method.

rc Its main drawbacks, on the other hand, are that it has an analogue output which requires AID conversion when interfaced to a computer ; the output can suffer from large fluctuations, and it has a shorter operational life.

The output voltage V o can be in direct current form in the case of the dynamo a d.

The below mention circuit is used thory measuring the speed of the rotor by considering the amplitude of the induced voltage. A very basic transducer which is always useful in the field of instrumentation, I The DC tachometer generator uses the commutator and brushes which have many disadvantages.


R L represents the electric load connected to the tachometer.

The rotor of the tachometer is made with thin aluminium cup, and it is placed between the field structure. Both of the latter two drawbacks are caused by the presence of the yheory in the d. Thus, either amplitude or frequency is used for measuring the angular velocity. The develops EMF is directly proportional to the speed of the shaft. The amplitude and frequency of the induced emf are equivalent to the speed of the shaft.

And i am starting it from tachhogenerator scratch. The AC tachometer has stationary armature and rotating magnetic field.

Basic Principle of Hot wire Anemometer When an electrically heated wire is placed in a flowing gas stream, heat is transferred from the w Your email address will thory be published. You May Also Like: Now as the field of the permanent field is fixed, the e. Thus, the commutator and brushes are absent in AC tachometer generator.

In this post, i am interested in covering the details about how to measure flow using Orifice meter. When not connected to a load resistance, generators will generate voltage roughly proportional to shaft speed.