Unconventional machining
Uconventional machining
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الأحد، 19 مارس 2017
الثلاثاء، 24 يناير 2017
Engine parts
ENGINE PARTESMany of us have heard the names of the pieces and parts of the vehicle maintenance technicians
when
it is in auto maintenance center or at the mechanical, as well as when he meets with a number of
obsessed with cars
Today we offer you a simple guide for months, parts of the car and called rolling them in the market
and among the technicians, as well as scientific called her, and function in a simple,
when
it is in auto maintenance center or at the mechanical, as well as when he meets with a number of
obsessed with cars
Today we offer you a simple guide for months, parts of the car and called rolling them in the market
and among the technicians, as well as scientific called her, and function in a simple,
cylinder head
His job is the upper part of the engine and is mounted on the lower part of the so-called block and
works as a cover for the engine and through the fuel and air entry into the engine, and come out
through the exhaust of combustion, as it's being installed by some other parts of the job valves
spark plugs and injectors fuel
Block cylender
Block is the main part of the engine which is where fuel combustion with the air happens to produce
energy, and has a cylindrical openings are installed pistons "Pistons" inside and is connected to the
pistons pole attachment "Crankshaft" in order to be transferred kinetic energy of shape bandwidth to
form circulatory in order to move the car tires, contains the block cylender internal streams do, through which
the fluid to cool the temperature as well as for the lubrication of metal parts that rub against each
other
Petrol motor
PETROL ENGINE
Petrol motor
The gasoline engine of an automobile is internal combustion,
Explosion. It is extremely widespread in the
Vehicles of all types and sizes,
Air, in water or on land.It also serves for mechanical tools and
To provide power to fixed installations.
The four phases of a gasoline engine
1 Admission
A Inlet valve
B Camshaft
C Candle
D Valve spring
E Exhaust Valve
F Water
G Bloc
H Bielle
I Gas intake
J Culasse
K Balance weights
Fuel and air mixed by injection or carburettor are
Sucked into the combustion chamber by the piston which descends,
The admission valve (s) being open.
2 Compression
A Ignition
B Compressed gas
The inlet valve (s) close, the piston goes up compress the mixture at a good pressure.
3 Combustion and relaxation
A The combustion flushes the piston downwards
The piston reaching its top dead center will compress the gas at the spark plug goes a few degrees before the MPH Is reached, will produce a high-voltage spark.This triggers a combustion of the gas which repels the piston.
4 Exhaust
The exhaust valve (s) will open to exhaust the gas which is pushed by the rising piston
Diesel Motor
DIESEL MOTOR
Diesel Motor
BY-SA 3.0, Wikimedia Commons
The diesel engine is a type of internal combustion engine developed between 1893 and 1897 by a
German engineer who gave his name to the invention: Rudolf Diesel.
Invented in 1897 by Rudolf Diesel
Principle and operation of diesel engine
oil, diesel or, rarer, vegetable oils. Unlike a petrol engine, the diesel engine does not have spark plugs,
since the spark plug is spontaneous thanks to the phenomenon of auto-ignition.
The basic principle is based on the presence of pistons which slide inside cylinders connected to
intake and exhaust manifolds. The operation of the diesel engine is divided into four stages: the air
intake allowed by the descent of the piston, the compression of the air then produced by the reverse
movement, injection, combustion and expansion and then exhaust gas Burned. This cycle of
operation is the most used for motor vehicles equipped with this type of engine. There are, however,
two-stroke diesel engine cycles, used by ships.
Évolution et utilisation du moteur diesel
The diesel engine has seen a number of improvements over the years, such as turbocharger turbocharging, which allowed performance to increase after the 1980 s. Thanks to this innovation, it has had a better performance than its competitor ", The gasoline engine.
Technology and operation of three-phase asynchronous motors
ELECTRIC MOTOR ENGINES
Technology and operation of three-phase asynchronous motors
Asynchronous motors are the most common motors.
Source: site of the sciences of the engineer.
In the exploded below, the fan at the end of the shaft allows the cooling of the motor.
1.Front front
2.Equalizing nut - washer
3.Front bearing
4.Registration of technical data
5.WirewoundStator
6.Carcasse
7.Key box
8.Plug board
9.Cover of terminal box
10. Cable gland
11.Clamp of the end of the shaft
12. Rotor
13.Rearing
Rear flake
15.Fan
16.Cap of the ventilator
The stator of a three-phase asynchronous motor consists of 3 winding located at the periphery. It is the static part that creates the rotating magnetic field.
The rotor is the central part of the motor which is secured to the transmission shaft. This is the moving part of the engine.
The inventor of the asynchronous motor is Nicolas Tesla born in Serbia in 1856.
Like any good inventor, he died poor and ignored in 1943. It is true that he was then working on a supreme weapon called "ray of death" which found its application only in the adventures of Blake and Mortimer ...
In 1960, the international unit for measuring the intensity of a magnetic field, the [Tesla], was named.
Operation signaling
The correct signaling of the operating mode and the defects which the electric motors and the machines they cause are essential for the safety of goods and persons.
Visualize the film below (put the sound) then answer a few questions (if necessary download Adobe Flash Player).
Electric motor
ELECTRIC MOTOR
Electric motor
An electrical machine is an electromagnetically device based on electromagnetism enabling the
conversion of electrical energy, for example in work or mechanical energy. This process is reversible
and can be used to generate electricity:
Electrical machines producing electrical energy from mechanical energy are commonly referred to as
generators, dynamos or alternators depending on the technology used.
Principle of operation of electric motors
We know that 2 magnets attract the opposite of their polarization:
It is possible to artificially create a magnet by feeding an electrical wire wound around a metal core:
The North-South polarization will depend on the current flow direction. Now, in alternating current, one can consider that the direction of the current reverses every 1 / 100th second.
Let us arrange a permanent magnet, free in rotation before a fixed artificial magnet whose polarization is inverted continuously. Since the South and North poles constantly attract one another, one imagines that the permanent magnet may be rotated (or at least maintain it there).
In our diagram above:
The permanent magnet is rotated: we will call it the rotor.
The assembly is an electric motor. One can imagine that it could drive for example a ventilator:
Synchronous motors
In our "engine", the "rotor" rotates as fast as the stator reverses its polarities. One will speak of a "synchronous" motor (same speed of rotation for the stator and the rotor).
For the alternating current distributed in Europe and Asia, the direction of the current reverses every one hundredth of a second (1 / 100 ths ).
This is due to its mode of manufacture and to the speed of rotation which has been chosen for the generators which produces it.
It is said to have a frequency of 50 Hz (Hertz), because it finds the same direction every 1 / 50th of a second.
The rotor tries to adjust its fixed polarity on the stator. Every 100th of a second, he will have completed ½ turn, ie 1 full turn in 1 / 50th of a second.
Obviously, the trained fan will do the same.
Once started, one way or the other, the rotation will take place as long as the stator is energized.
Nombre de pôles et vitesse de rotation
The stator of the motor studied in the previous paragraph had a single winding and therefore two poles.
Q1: How many turns will the rotor take in one second?
Every 1 / 100th of a second, each pole reverses its polarization causing the rotor to traverse a 1/2 turn.
APPLICATION
-
1: How many turns will the rotor take in one second?
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-
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-Explanation:
Every 1 / 100th of a second, each pole reverses its polarity causing the rotor to travel a 1/2 turn.
So the rotor runs a turn in 2 × 1 / 100th second, either in 1 / 50th of a second or 0.02 [s].
It therefore performs 50 revolutions per second (1 / 0.02).
-Q2: How many turns will the rotor make in one minute?
-
-
-
-
-Explanation:
The rotor will therefore perform 50 revolutions per second therefore 50 × 60 = 3000 [RPM]
It is possible to design a stator equipped with 4 poles (2 coils).
Every 1 / 100th of a second, each pole reverses its polarization causing the rotor to travel ¼ turn.
Q3: How many turns will the rotor take in one second?
-
-
-
-
-Explanation
Every 1 / 100th of a second, each pole reverses its polarization causing the rotor to go through a 1/4 turn.
So the rotor runs a turn in 4 × 1 / 100th second, either in 1 / 25th of a second or 0.04 [s].
It therefore performs 25 revolutions per second (1 / 0.04).
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