What is the working principle of tachogenerator?
Definition: The tachometer use for measuring the rotational speed or angular velocity of the machine which is coupled to it. It works on the principle of relative motion between the magnetic field and shaft of the coupled device.
What is tachogenerator in control system?
Tachometer generators (or tachogenerators) are electromechanical devices which output a voltage proportional to their shaft speed. They are used to power tachometers and to measure the speed of motors, engines, and other rotational devices.
What is tachogenerator explain the working of DC tachogenerator?
The D.C Tachogenerators is a type of electrical type’s tachogenerators which can also be used for speed measurement. 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.
What type of transducer is the tachogenerator?
Table 5.1 Velocity transducers. Transducers which measure the shaft velocity directly. These are analogue devices whose variable output is proportional to the shaft rotational velocity. Examples are d.c. and a.c. tachogenerators.
Is tachogenerator a sensor?
Rotor Speed Sensors Types of speed sensor include tachogenerators and magnetic variable reluctance (VR) probes. A tachogenerator is a shaft-driven, electrical generator with a variable frequency output, which is related to speed. These devices are very rugged, but produce a relatively low output signal.
What does the tachogenerator measure and what output is this physical quantity converted to?
A tachogenerator is attached to the object whose speed is being measured — such as a fan or motor shaft — and evaluates the voltage of the power produced by the generator to determine the rotational speed of the object.
What are the requirements of a good tachogenerator?
Tachogenerators. Instability of output cause due to aging of parts, shift in magnetic circuits etc., should be minimum. operation under varying ambient temperature. ripple content in the rectified output.
Is tachogenerator a transducer?
What type of transducer is tachogenerator?
The transducers used are a moving coil type, moving magnet type, or change of reluctance type, with relation to a fixed coil. Thus velocity of vibration is the speed at which the vibrating part is moving at any instant, and output voltage is proportional to velocity vibration.
What is the difference between AC and DC tachogenerator?
Difference between AC tachogenerator and DC tachogenerator The AC tachogenerator is use to measure speed only in one direction only. The DC tachogenerator is use to measure speed in both direction. It consists of a stator and a rotor arrangement or a squirrel cage setup. It consists of horse shoe type permanent magnet.
What is the principle of operation of a tachogenerator?
The principle of operation of a tachogenerator, being the dual of an electric motor, is also based on Faraday’s law of electromagnetic induction which states, as shown by eqn (2), that: the magnitude of a voltage induced in a single loop conductor is proportional to the rate of change of lines of forces passing through (or linked with) that loop.
What are the advantages of a D.C tachogenerator?
The advantages of d.c tachogenerator are as follows: 1.The output voltage is small enough to measure it with conventional d.c voltmeters. 2.The polarity of output voltage directly indicates the direction of rotation. The Disadvantages of d.c tachogenerator are as follows:
How is the polarity of a tachogenerator determined?
A tachogenerator produces a DC voltage with a polarity determined by the direction of motor shaft rotation, and a magnitude determined by the speed of rotation of the motor shaft.
How is an AC tachogenerator used to measure speed?
The AC tachogenerator is used to measure the speed only in one direction. In AC tachogenerator the armature is provided with an AC winding, either single phase or three phase windings. When the rotor is stationary and primary winding excited by an AC input voltage, the induced voltage in secondary is zero.