What is Electrical Machine II EEC 233?
It may be necessary to define what we mean by the term electrical machines. A machine is a device that does useful work in a predictable way according to some physical laws. It acts as a transducer, or convertors, accepting an input of energy in one physical from and transforming it, more or less effectively, into another.
An electromagnetic machine, in the essential conversion process, uses energy in an
intermediate magnetic form. As a motor the machine takes in electrical energy and converts it into mechanical work, such as driving a machine tool or a lift, or operating a loudspeaker.
An electro-magnetic machine is usually reversible and cab, as a generator, producer
electrical energy form some other kind, such as the mechanical energy of prime- movers or the a caustic energy of microphones and gramophone pickups.
Electrical energy is versatile and controllable. Its special lie in that can be transfer
continuously and economically from to place (Transmission), made widely available as a
services (distribution), used in conveying intelligence (Telecommunication and data
processing), and applied to indicate an supervise production systems (control,
instrumentation and computation). It is readily converted into sound, light, heat and useful forms of energy. In particular it is easily converted to or from mechanical energy in the electromagnetic machines
Lecture Note
The theory of EEC 233 has the following topics treated;
Chapter 1: Basic Principles of electric machines:
1.1 Introduction
1.2 Electro- mechanical energy conversion
1.3 Alignment devices
1.4 Interaction devices
1.5 Induction devices
1.6 Work Examples
1.7Electromagnets
1.8 Faraday's Law
1.9Lenz's Law
1.10 Rotating magnetic field
1.11 Synchronous speed
Chapter 2 Three phase induction motor
2.1 Introduction
2.2 Construction of Induction Motor
2.2 The principle of operation of the induction Motor
2.3 The slip
2.4 Name Plate
Chapter 3: Synchronous Machine Introduction
3.2 Stator construction
3.3 Rotor construction
3.4 Principle of operation of the synchronous generator
3.5 Principle of operation of the synchronous motor
3.6 Excitation Methods
Chapter4:
Control & protection of electric motors
4.1 Need for Circuit Protection
4.2 Types of Overcurrent Protective Devices
4.2.0 Protection and control devices
4.2.1 Fuses
4.2.2 Circuit Breakers
4.3 Control devices
4.3.1 Relay
4.3.2 Contactors
4.3.3Pushbuttons
4.3.4 Selector Switches
4.3.5 Indicator Lights
Chapter 5: Energy conversion
5.1 Electro-mechanical energy conversion
5.1.1Major energy conversion principle
5.2 Energy conversion
5.3 Linked energy system
5.4 Energy storage
5.5 Energy ballance
5..5.1 Block diagram of energy balance equation
5.6 Magnetic field energy and force
5.6.1 Magnetic field
5.6.2 Magnetic circuit
5.7 Magnetic field energy
5.8 Maxwell stress
5.9 Energy density
5.10 Faraday's Lenz Law
5.11 Energy Conversion
5.11.1 Constant current
5.11.2 Constant flux
5.11.3 General Condition
5.11.4 Diffirencial foam
5.12 Alignment force and torque; single excitation
5.11 Work examples
5.11.3 General Condition
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Practical Manual
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