Posted on February 21, 2019


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 relative motion induces the EMF in the coil which is placed between the constant magnetic field of the permanent magnet. The output voltage V o can be in direct current form in the case of the dynamo a d. C Tachogenerator is kept in the permanent magnetic field. The DC tachometer works on the principle that when the closed conductor moves in the magnetic field, EMF induces in the conductor. Tachogneerator and electrical are the two types of the tachometer.


The rotor tachogenertaor made of the highly inductive material which has low inertia. The resistance is connected in series with the voltmeter for controlling the heavy current of the armature. The armature of the DC generator revolves between the constant field of the permanent magnet. Tachogenerators can also indicate the direction of rotation by the polarity of the output voltage. Tachogenerators are frequently used to measure the speeds of electric motors, engines, and the equipment they power: The below mention circuit is used for measuring the speed of the rotor by considering the theoyr of the induced voltage.


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

The constant of d K t is generally linear within a large dynamic range but does vary in relation to: The moving coil voltmeter measures the induced emf. The polarity of output voltage indicates the direction of rotation.

The magnitude of the thekry emf is proportional to the shaft speed. A generator specially designed and constructed for this use is called a tachometer or tachogenerator. Basic Principle of Hot wire Anemometer When an electrically heated wire is placed in a flowing gas stream, heat is transferred from the w The develops EMF is directly proportional to the speed of the shaft.

Figure 2 Tachogenerator equivalent circuit. The rotation of rotor between the magnetic field induces the voltage in the sensing winding.

The armature of the tachogenerator is coupled to the machine whose speed is to be measured. R Tzchogenerator represents the electric load connected to the tachometer.

It works on the principle of relative motion between the magnetic field and shaft of the coupled device. Leave a Reply Cancel reply Your email address will not be published.

Follow Us likes followers subscribers. Circuit Globe All about Electrical and Electronics. This phenomena is therefore the same which gives rise to the back electromotive force b.

Hot Wire Anemometer Thermal Method.


The commutator converts the alternating current of the armature coil to the direct current with the help of the brushes. 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 angular velocity W, as required and a shown previously in eqn tacchogenerator.


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 tachogenerqtor suffer from large fluctuations, and it has a shorter operational life.

The mechanical tachometer measures the speed of shaft regarding revolution per minutes. I have prepared a list of instrumentation and control engineering based companies in India, which you should must know. One of the more common voltage signal ranges used with tachogenerators is 0 to 10 volts. The AC tachometer generator designs for reducing the problems.

The stator of the generator consists two windings, i. The rotor of the tachometer is made with thin aluminium cup, and it is placed between the field structure.

Figure 1 Typical transfer characteristic of tachogenerator. The electrical tachometer converts the angular velocity into an electrical voltage. When not connected to a load resistance, generators will generate voltage roughly proportional to shaft speed. The induces voltage is proportional to the speed of the rotation. Your email address will not be published. The tachogenerator is a direct-type velocity transducer. The machine whose speed is to be measured is coupled with the shaft of thsory DC tachometer generator.

The induces voltages are rectified and then passes to the capacitor filter for smoothening the ripples of rectified voltages. The input is provided to the reference winding, and the tachogemerator is obtained from the quadrature winding.