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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The rotor of the tachometer is made with thin aluminium cup, and it is placed between the field structure. Now as the field of the permanent field is fixed, the e. Circuit Globe All about Electrical and Electronics.

Tachogenerators can also indicate the direction of rotation by the polarity of the output voltage. This phenomena is therefore the same which gives rise to the back electromotive force b. The AC tachometer generator designs for reducing the problems.

The below mention circuit is used for measuring the speed of the rotor by considering the amplitude of the induced voltage. The rotation of rotor between the tachogeneartor field induces the voltage in the sensing winding.

The magnitude of the induces emf depends on theoy flux link with the conductor and the speed of the shaft.


When not connected to a load resistance, generators will generate voltage roughly proportional to shaft speed. Thus, the commutator and brushes are absent in AC tachometer generator. Tachogenerators Chapter dcc – Electrical Instrumentation Signals.

The polarity of the induces voltage determines the direction of motion of the shaft. The nonlinear relationship obtains between the output voltage and input speed when the rotor rotates at high speed.

Depends on the natures of the induced voltage the electrical tachometer is categorized into two types. Advertise with Ads Link x In this post, i am interested in covering the details about how to measure flow using Orifice meter.

Thus it is mostly used for measuring the tachpgenerator speed of the shaft.

Tachogenerator Principle Of Operation And Characteristic

Figure tachgenerator Tachogenerator equivalent circuit. A very basic transducer which is always useful in the field of instrumentation, I These variations are usually amply documented in the manufacturer data sheets and do not present a problem.

The machine whose speed is to be tachogeenrator is coupled with the shaft of the DC tachometer generator. The armature of the DC generator revolves between the constant field of the permanent magnet. The input is provided to the reference winding, and the output is obtained from the quadrature winding.


The induces voltages are rectified and then passes to the capacitor filter for smoothening the ripples of rectified voltages. The equivalent circuit of a tachogenerator is also the dual of an electric motor and is shown in Figure The armature of the tachogenerator is coupled to the machine whose speed is to be measured.


The armature of the D. C tachogenerator is shown in tachogeneragor figure. Thus, either amplitude or frequency is used for measuring the angular velocity. I have prepared a list of instrumentation and control engineering based companies in India, which you should must know.

Difference between AC tachogenerator and DC tachogenerator – Polytechnic Hub

A generator specially designed and constructed for this use is called a tachometer or tachogenerator. One of the more common voltage signal ranges used with tachogenerators is 0 to 10 volts. Basic Principle of Hot wire Anemometer When an electrically heated wire is placed in a flowing gas stream, heat is transferred from the w 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.

Design challenges and improvement techniques for SAR driver circuit Design challenges and improvement techniques for SAR driver circuit. Leave a Reply Cancel reply Your email address will not be published.

The moving coil voltmeter measures the induced emf.