File Name: ac generator working principle and construction .zip
An induction generator or asynchronous generator is a type of alternating current AC electrical generator that uses the principles of induction motors to produce power. Induction generators operate by mechanically turning their rotors faster than synchronous speed.
Generators are useful appliances that supply electrical power during a power outage and prevent discontinuity of daily activities or disruption of business operations. Generators are available in different electrical and physical configurations for use in different applications. In the following sections, we will look at how a generator functions, the main components of a generator, and how a generator operates as a secondary source of electrical power in residential and industrial applications. An electric generator is a device that converts mechanical energy obtained from an external source into electrical energy as the output. Instead, it uses the mechanical energy supplied to it to force the movement of electric charges present in the wire of its windings through an external electric circuit.
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 develops EMF is directly proportional to the speed of the shaft. Mechanical and electrical are the two types of the tachometer. The mechanical tachometer measures the speed of shaft regarding revolution per minutes.
The electrical tachometer converts the angular velocity into an electrical voltage. The electrical tachometer has more advantages over the mechanical tachometer. Thus it is mostly used for measuring the rotational speed of the shaft. Depends on the natures of the induced voltage the electrical tachometer is categorized into two types. Permanent magnet, armature, commutator, brushes, variable resistor, and the moving coil voltmeter are the main parts of the DC tachometer generator.
The machine whose speed is to be measured is coupled with the shaft of the DC tachometer generator. The DC tachometer works on the principle that when the closed conductor moves in the magnetic field, EMF induces in the conductor. The magnitude of the induces emf depends on the flux link with the conductor and the speed of the shaft.
The armature of the DC generator revolves between the constant field of the permanent magnet. The rotation induces the emf in the coil. The magnitude of the induced emf is proportional to the shaft speed. The commutator converts the alternating current of the armature coil to the direct current with the help of the brushes.
The moving coil voltmeter measures the induced emf. The polarity of the induces voltage determines the direction of motion of the shaft. The resistance is connected in series with the voltmeter for controlling the heavy current of the armature.
The DC tachometer generator uses the commutator and brushes which have many disadvantages. The AC tachometer generator designs for reducing the problems. The AC tachometer has stationary armature and rotating magnetic field. Thus, the commutator and brushes are absent in AC tachometer generator. The amplitude and frequency of the induced emf are equivalent to the speed of the shaft. Thus, either amplitude or frequency is used for measuring the angular velocity. The below mention circuit is used for measuring the speed of the rotor by considering the amplitude of the induced voltage.
The induces voltages are rectified and then passes to the capacitor filter for smoothening the ripples of rectified voltages. 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. The rotor is made of the highly inductive material which has low inertia.
The input is provided to the reference winding, and the output is obtained from the quadrature winding. The rotation of rotor between the magnetic field induces the voltage in the sensing winding.
The induces voltage is proportional to the speed of the rotation. The nonlinear relationship obtains between the output voltage and input speed when the rotor rotates at high speed. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Leave a Comment Cancel Reply Your email address will not be published.
An Electrical Generator is a machine that converts mechanical energy into electrical energy. This machine is further classified into two other kinds based on the power supply i,e ac and dc. The basic difference name a generator as an ac or dc is its input power supply. If the supply to the machine is single directional then it is Dc and it is vice-versa if it is alternating. The internal operation differs with this input supply. Let us discuss in detail considering all the aspects that make this machine function.
AC generator working principle is, these are commonly referred to as alternators which work on the principle of Faraday's Law of Electromagnetic Induction. The.
General Information: Emergency Contact: Email: contactus powerplus. Is your business in need of an AC generator or a DC backup generator? Can you tell the difference between the types of generators available on the market and which one best fits your needs? Here is what you need to know so you can invest in the right generator for your business.
AC Generator is an electrical machine which converts mechanical energy into electrical energy. In this post we will discuss AC Generator working and construction. Stator is the stationary part of machine whereas rotor is rotating part. A prime mover is coupled to this rotor to supply mechanical energy. Stator is stationary component on which armature winding is wound.
A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf. This article outlines basic construction and working of a DC generator. Note: Theoretically, a DC generator can be used as a DC motor without any constructional changes and vice versa is also possible. These basic constructional details are also valid for the construction of a DC motor.
Basically, an AC generator is an electrical machine that converts mechanical energy into electrical energy in the form of Alternating Current AC. Basic principle behind the working of an AC synchronous generator is also Faraday's law of electrical induction , somewhat similar to working of a DC generator. If a closed path is provided to the conductor, induced emf causes current to flow in the circuit.
Youtube - Hindi. The generation of alternating currents ac is based on the phenomenon of electromagnetic induction. Whenever the magnetic flux changes an emf will be induced in the coil. AC generator is a device that converts mechanical energy into electrical energy alternating currents.