Wednesday, March 30, D. C Tachogenerators The D. The D. C tachogenerator is shown in below figure. The armature of the D. C Tachogenerator is kept in the permanent magnetic field.
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Common D. C Tachogenerator Principle The D. The D. C tachogenerator is shown in below figure. The armature of the D. C Tachogenerator is kept in the permanent magnetic field. The armature of the tachogenerator is coupled to the machine whose speed is to be measured. When the shaft of the machine revolves, the armature of the tachogenerator revolves in the magnetic field producing e.
Now as the field of the permanent field is fixed, the e. The e. The series resistance is used to limit the current under output short circuit condition. The polarity of output voltage indicates the direction of rotation. The commutator collects current from armature conductors and converts internally induced a.
Advantages The advantages of d. The output voltage is small enough to measure it with conventional d. The polarity of output voltage directly indicates the direction of rotation. Disadvantages The Disadvantages of d. Because of variations in contact resistance, considerable error is introduced in the output voltage.
Hence periodic maintenance of the commutator and brushes is required. Non-linearity in the output of the d. Hence input resistance of meter should be very high as compared to the output resistance of the generator. Share With Your Friends.
Construction and working of DC tachogenerator
PDF Version Question 1 Generators used in battery-charging systems must be regulated so as to not overcharge the battery ies they are connected to. The fundamental principle upon which their operation is based is called negative feedback: where a system takes action to oppose any change in a certain variable. In this case, the variable is generator output voltage. Explain how the relay works to prevent the generator from overcharging the battery with excessive voltage.
D.C Tachogenerator Principle
Nikodal The commutator converts the alternating current of the armature coil to the direct current with the help of the brushes. The magnitude of the induces emf depends on the flux link with the conductor and the speed of the shaft. Published under the terms and tachogenetator of the Design Science License. The equivalent circuit of a tachogenerator is also the dual of an electric motor and is shown in Figure Permanent magnet, armature, commutator, brushes, variable resistor, and the moving coil voltmeter are the main parts of the DC tachometer generator. Quote of the day. These variations are usually amply documented in the manufacturer data sheets and do not present a problem.
DC Generator Theory
Common D. C Tachogenerator Principle The D. The D. C tachogenerator is shown in below figure. The armature of the D. C Tachogenerator is kept in the permanent magnetic field. The armature of the tachogenerator is coupled to the machine whose speed is to be measured.
DC TACHOGENERATOR THEORY PDF
Togal The AC tachometer has stationary armature and rotating magnetic field. When the shaft of the machine revolves, the armature of the tachogenerator revolves in the magnetic field producing e. One of the more common voltage signal ranges used with tachogenerators is 0 to 10 volts. When not connected to a load resistance, generators will generate voltage roughly proportional to shaft speed. The input is provided to the tachogenwrator winding, and the output is obtained from the quadrature winding. Difference between AC tachogenerator and DC tachogenerator The below yachogenerator circuit is used for measuring the speed of the rotor by considering the amplitude of the induced voltage.