Table of Contents
What do you mean by tachogenerator?
A tachogenerator, or tachometer generator, is an electromechanical device used to accurately measure the speed of engines and motors. In other words, a tachogenerator can convert mechanical energy into electrical energy.
What is the difference between tachogenerator and tachometer?
A tachogenerator can be a part of control loop, while tachometer is just a display for human readings. Tachogenerator is usually referred as permanent magnet DC brush generator. It has many slots and very fine brush collector.
What is the use of a tachogenerator?
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 and what is its input range?
One of the more common voltage signal ranges used with tachogenerators is 0 to 10 volts. Tachogenerators can also indicate the direction of rotation by the polarity of the output voltage. When a permanent-magnet style DC generator’s rotational direction is reversed, the polarity of its output voltage will switch.
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 is the principle of DC tachogenerator?
PRINCIPLE OF OPERATION : The DC Tachogenerator is a speed transducer, which develops DC voltage proportional to speed of the motor connected to it. Permanent Magnetic field eliminates the need of external excitation and offers extremely reliable and stable outputs.
What is a DC tachometer?
DC tachometer generators provide a convenient means of converting rotational speed into an isolated analog voltage signal suitable for remote monitoring and velocity control applications.
Is Tachogenerator a sensor?
How does a Tachogenerator work?
A DC tachogenerator uses an armature that is attached to the object being measured. The armature rotates within a stationary magnetic field, and the induced voltage is proportional to shaft speed. An AC tachogenerator does away with brushes and instead uses a stationary, wound stator and a rotor with permanent magnets.
What is the working principle of tachogenerator?
Can be measured using tachogenerator?
2 Velocity. Many applications require the measurement of angular velocity. The commonest method is the tachogenerator which is a simple d.c. generator whose output voltage is proportional to speed. Speeds up to 10 000 rpm can be measured, the upper limit being centrifugal force on the tacho commutator.
How does AC and DC tachometer work?
It works on the principle of relative motion between the magnetic field and shaft of the coupled device. The relative motion induces the EMF in the coil which is placed between the constant magnetic field of the permanent magnet. The mechanical tachometer measures the speed of shaft regarding revolution per minutes.
What is the purpose of a tachogenerator generator?
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.
How is the speed of a tachogenerator measured?
The commonest method is the tachogenerator which is a simple d.c. generator whose output voltage is proportional to speed. A common standard is 10 volts per 1000 rpm. Speeds up to 10 000 rpm can be measured, the upper limit being centrifugal force on the tacho commutator. Pulse tachometers are also becoming common.
Can a voltage divider be used as a tachogenerator?
Although a voltage divider could theoretically be used with a tachogenerator to extend the measurable speed range in the 0-10 volt scale, it is not advisable to significantly overspeed a precision instrument like this, or its life will be shortened. Tachogenerators can also indicate the direction of rotation by the polarity of the output voltage.
What is the armature of a tachogenerator made of?
The armature consists of a cylindrical, hollow rotor, composed of wires held together by fibreglass and a polymer resin and has a low moment of inertia which ensures that the system performance is not compromised, similar to that of the ironless-rotor d.c. machine, discussed in Chapter 5, Brushed direct-current motors.