Generator And Motor Principles Pdf
File Name: generator and motor principles .zip
- Induction Generator working theory
- Basic construction and working of a DC Generator.
- Basic construction and working of a DC Generator.
- Emf Equation of a DC Generator
The initial electromagnetic generator Faraday disk was invented by British scientist namely Michael Faraday in the year A DC generator is an electrical device used for generating electrical energy. The main function of this device is to change mechanical energy into electrical energy.
Facebook Twitter. Synchronous Generator or Alternator:. It is known that the electric supply used now-a-days for commercial, as well as domestic purposes, is of alternating type. Similar to d. Machines generating ac EMF are called alternators or synchronous generators.
Induction Generator working theory
Even though annealed at the mill, fully processed material may require further stress relief anneal after stamping. The stresses introduced during punching degrade the material properties around the edges of the lamination, and must be removed to obtain maximum performance.
Because of its lower electrical conductivity, aluminum wire requires a 1. Insulation Modern magnet wire typically uses one to four layers of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer.
It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models that explicitly describes nominal geometry and its allowable variation. It tells the manufacturing staff and machines what degree of accuracy and precision is needed on each controlled feature of the part.
Hipot and surge test the stator after varnish at VAC, max current leakage 5mA Before and after varnish, perform corona test partial discharge with pulse up to but not exceeding V. Resistance The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor. Electrical resistance shares some conceptual parallels with the mechanical notion of friction.
Thus the turn insulation is critical to the life of a motor. Low voltage tests on form-wound stators, such as inductance or inductive impedance tests, can detect if the turn insulation is shorted, but not if it is weakened. Only the surge voltage test is able to directly find stator windings with deteriorated turn insulation.
By applying a high voltage surge between the turns, this test is an overvoltage test for the turn insulation, and may fail the insulation, requiring bypassing of the failed coil, replacement or rewind.
Electric Machine Parameter and Testing — Part 5 Partial Discharge Test IEC TS For many years, the measurement of partial discharges PD has been employed as a sensitive means of assessing the quality of new insulation as well as a means of detecting localized sources of PD in used electrical winding insulation arising from operational stresses in service.
Compared with other dielectric tests i. The PD testing of rotating machines is also used when inspecting the quality of new assembled and finished stator windings, new winding components and fully impregnated stators. The measurement of partial discharges can also provide information on: points of weakness in the insulation system; ageing processes; further measures and intervals between overhauls.
Although the PD testing of rotating machines has gained widespread acceptance, it has emerged from several studies that not only are there many different methods of measurement in existence but also the criteria and methods of analyzing and finally assessing the measured data are often very different and not really comparable. Consequently, there is an urgent need to give some guidance to those users who are considering the use of PD measurements to assess the condition of their insulation systems.
Electric Machine Electric machine — transducer for converting electrical energy to mechanical energy or mechanical energy to electrical energy Types of Electric machines Motors Generators Sensors Electromagnets Electromagnetic Amplifiers, etc. Easy to predict motor performance Simple, inexpensive control electronics Use of a feedback device is optional Difficult to design brush system Limited availability of the brush system components Very difficult to predict brush life Not a motor of choice for high-performance application Manufacturing cost very low for mass production, when fully tooled.
Dielectric Materials Paper Epoxy Plastic. Magnet Wire Copper Aluminum Litz. Deterioration of Magnetic Properties due to Punching Fully processed material is simply material which has been annealed to optimum properties at the steel mill. This is particularly true for parts with narrow sections, or where very high flux density is required. Conductor The most suitable materials for magnet wire applications are unalloyed pure metals, particularly copper High-purity oxygen-free copper grades are used for high-temperature applications Aluminum magnet wire is sometimes used as an alternative for transformers and motors.
Grain-Oriented Silcon Steel. Br — 5, — 13, Hc — — 1, MGOe 1. Br — 6, — 10, Hc — — 1, MGOe 1. Br — 3, — 4, Hci — 3, — 4, MGOe 2. Simple Shapes: Arcs, Rect. Br — 8, — 11, Hci — 11, — 21, MGOe — 18 — Br — 10, — 14, Hci — — 14, MGOe 27 — Br — 9, — 13, Hc — 50 — MGOe — 4. Bonded Flexible Callenered or Extruded. Br — 6, — 8, Hci — 4, — 18, MGOe — 7. Simple Geometry, Close Tolerancing W.
Molded With Lower Tooling Cost. Spray and fluid bed drip applications in high-temperature cut-through resistance. Spray and fluid bed drip applications for high-temperature cut-through and bridging gaps. Cold electrostatic fluid bed, hot venturi spray, or hot fluid be dip for fractional horsepower motor stators and armatures. Electrostatic fluid bed process, superior cut-through resistance and well heat, chemical and moisture resistance. Find contaminations and defects in phase-to-ground insulation.
Detects deterioration of the phase-to-ground and turn-to turn insulation. Detects deterioration of the phase-to-ground and phase-to phase insulation.
Basic construction and working of a DC Generator.
Facebook Twitter. Similar to a d. If a three phase supply is given to the stator of a three-phase alternator, it can work as a motor. As it is driven at synchronous speed , it is called Synchronous generator. So if alternator is run as a motor, it will rotate at a synchronous speed. Such a device which converts an electrical energy into a mechanical energy running at synchronous speed is called synchronous motor.
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. Hence, let's call this point as construction of a DC machine instead of just 'construction of a dc generator'. The above figure shows constructional details of a simple 4-pole DC machine.
A dynamo is an electrical generator that creates direct current using a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor , the alternating-current alternator , and the rotary converter. Today, the simpler alternator dominates large scale power generation , for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator. Also, converting alternating to direct current using rectifiers such as vacuum tubes or more recently via solid state technology is effective and usually economical.
The basic principle of a dc motor is the creation of a rotating magnet inside the mobile part of the motor, the rotor. This is accomplished by a device called the.
Basic construction and working of a DC Generator.
An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. In principle, any AC electrical generator can be called an alternator, but usually the term refers to small rotating machines driven by automotive and other internal combustion engines. An alternator that uses a permanent magnet for its magnetic field is called a magneto. Alternators in power stations driven by steam turbines are called turbo-alternators.
Induction motor works on the principle of electromagnetic induction.
Emf Equation of a DC Generator
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. This flow of electric charges constitutes the output electric current supplied by the generator. The modern-day generator works on the principle of electromagnetic induction discovered by Michael Faraday in
Recieve free updates Via Email! Home Electrical machines Power system Ask a question Contact electricaleasy. Share: Facebook Twitter Linkedin. Just like a DC Machine , a same induction machine can be used as an induction motor as well as an induction generator , without any internal modifications. Before starting to explain how an induction asynchronous generator works , I assume that you know the working principle of an induction motor. In an induction motor, the rotor rotates because of slip i. Rotor tries to catch up the synchronously rotating field of the stator but never succeeds.
The electric generator was invented before the correlation between electricity as well as magnetism was discovered. These generators use electrostatic principles to operate with the help of plates, moving belts which are charged electrically as well as disks to carry charge toward an electrode with high potential. Generators use two mechanisms to generate the charge like the triboelectric effect otherwise electrostatic induction. So, it generates low current as well as very high voltage due to the complexity of insulating machines as well as their inefficiency. The power ratings of Electrostatic generators are low so they never utilized for electrical power generation.
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Even though annealed at the mill, fully processed material may require further stress relief anneal after stamping. The stresses introduced during punching degrade the material properties around the edges of the lamination, and must be removed to obtain maximum performance. Because of its lower electrical conductivity, aluminum wire requires a 1. Insulation Modern magnet wire typically uses one to four layers of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer. It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models that explicitly describes nominal geometry and its allowable variation. It tells the manufacturing staff and machines what degree of accuracy and precision is needed on each controlled feature of the part.
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