- •V.S. Martynjuk, I.I. Popovska
- •Study of the electromechanics energy converters design Aim of work
- •Theoretical positions
- •Design of direct current electromechanics converters
- •Design of synchronous electromechanic converters
- •Designs of asynchronous electromechanics converters
- •Order of work performance
- •Contents of a report
- •Control questions
- •Research of single-phase transformer Aim of work
- •Order of work implementation
- •Table of report contents
- •Control questions
- •Research of dc generator of parallel excitation Aim of work
- •Order of work implementation
- •Control questions
- •Research of direct current мотоrs Aim of work
- •Report content
- •Control questions
- •Research of three-phase asynchronous motor with squirrel-cage rotor Aim of work
- •Order of work performance
- •Table of report contents
- •Control questions
- •Calculation of electromagnets of direct-current а. Preliminary calculation of electromagnet. Calculation of key size of core
- •1.1. Electromagnets with external turning armature
- •B) Recursive short-time mode
- •C) Short-time duty
- •1.2. Electromagnets with external forward armature travel
- •B) Recursive short-time mode
- •C) Short-time duty
- •Design of asynchronous machines
- •Features of asynchronous generators operation
- •2. Determination of main sizes and calculation of asynchronous machine
- •Choice of number of stator and rotor slots
- •4. Active and inductive resistances of stator and rotor winding
- •5. Choice of excitation capacitor
- •6. A calculation of magnetic circuit and determination of o.C. Current of asynchronous machine in traction mode
- •7. Calculation and plotting of magnetic characteristic (b-h curve) of asynchronous machine
- •8. Plotting of operating characteristics of asynchronous motor
- •9. Losses of energy and efficiency of asynchronous machine
- •Home work (by discipline “Aviation electric machines and devices”)
MINISTRY OF EDUCATION AND SCIENCE, YOUTH AND SPORT OF UKRAINE
National Aviation University
V.S. Martynjuk, I.I. Popovska
AVIATION ELECTRIC MACHINES AND DEVICES
The methodical indicatings to fulfilment of Practical classes, Laboratory works 1− 4, Term paper for the students of the Institute of Aerospace Science
Kyiv 2011
MINISTRY OF EDUCATION AND SCIENCE, YOUTH AND SPORT OF UKRAINE
National Aviation University
V.S. Martynjuk, I.I. Popovska
AVIATION ELECTRIC MACHINES AND DEVICES
The methodical indicatings to fulfilment of Practical classes, Laboratory works 1− 4, Term paper for the students of the Institute of Aerospace Science
Kyiv 2011
UDC 621.313:629.73 (075.8)
ББК О562 0я7
M35
V.M. Sineglazov − Doctor of Technical Sciences, Professor (Head of a chair of Computer-integrated Technologies Department);
L.G. Agamov – Candidate of Technical Sciences, Associate Professor (Leading Scientist of Aviation Research Institute)
Approved by the Methodical and Editorial Board of the National Aviation University (Minutes____ of ___________2011)
Розглянуті будова трансформаторів і електричних машин, загальні питання їх теорії; запропонована методика досліджень характеристик трансформаторів, генераторів і моторів постійного струму, авіаційних асинхронних машин. Розглянута також методика розрахунку електричних машин і апаратів.
Для студентів спеціальності 6.100107а «Авіаційні електричні машини та апарати».
M35 Martynjuk V.S.
Aviation Electric Machines and devices: The methodical indicatings to fulfilment of Practical classes, Laboratory works 1− 4, Term paper for the students of the Institute of Aerospace Science / V.S. Martynjuk, I.I. Popovska – K.: National Aviation University «NAU−DRUK» Publishing House, 2011. – 84.
ISBN 978-966-598-631-7
Considered design of transformers and electric machines, general questions of their theory; offered methodology of characteristics researches of transformers, generators and motors of direct-current, aviation asynchronous machines. Methodology of calculation of electric machines and devices is considered also.
For the students of speciality 6.100107а "Aviation electric machines and devices".
UDC 621.313:629.73 (075.8)
ББК О562.0я7
ISBN 978-966-598-631-7 © Martynjuk V.S., Popovska І.І., 2011
Study of the electromechanics energy converters design Aim of work
Acquaintance with design of electromechanics energy converters (EEC).
Theoretical positions
Operation of any EEC is based on the use of fundamental physical laws of electromagnetic interaction: electromagnetic induction law and Ampere’s law.
For realization of these laws any EEC must consist of two basic elements: inductor - element, intended for creation of magnetic field and armature — element which electromechanics convertion of energy is in.
In direct current EEC and in the synchronous machines there can be an inductor a permanent magnet, but more frequent the electromagnets are used. In the last case the winding of electromagnet is called „excitation winding"(EW).
For providing of electromechanics convertion of energy an inductor and armature must be in a position of the mutual moving, therefore they are separated from each other by air-gap. It is considered in the theory of electric machines, that energy of magnetic field is concentrated in air-gap.
As is generally known, magnetic flux is continuous and it passes not only through air-gap, but also through parts of design of inductor and armature. With the aim of reduction of magnetic resistance of these parts of EEC design, they are made of the alloy steel which have (unlike air) small magnetic resistance. However the magnetic resistance of steel parts does not remain constant: it is multiplied with the increase of induction of magnetic field. This phenomenon is conditioned by the magnetic saturation of steel materials.
The inductors of electric machines can create in air-gap magnetic flux (direct current EEC and synchronous machines) constant in time, and also pulsating in time flux or such, that is revolved in the air-gape. The electromechanics converters of the first type have a common name „conduction", and the second type − „induction".
EEC part, that is revolved, has a name „rotor", and immobile part − „stator". Sometimes meet EEC, which both parts are revolved in (double rotated machines).
EEC can work in two basic modes: generator, that is converter of mechanical energy in electric one and electric motor, that is reverse convertion of energy.
All EEC are inverted without exception.