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Murad Al-Qasim

Electrical Engineer

You can be creative in anything - in math, science, engineering, philosophy - as much as you can in music or in painting or in dance.  

  • Kuwait City
  • Site Electrical Engineer
  • Electrical Engineering
  • Reading
  • Kuwait City
  • Site Electrical Engineer
  • Electrical Engineering
  • Reading

Portfolio [ Online Course & Educational Content ]

I will Share some Lessons ,I hope it will help

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  • What is the Slip ?

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    Created by Murad Al-Qasim

     The number of poles and the frequency applied determine the speed of the Motor This formula [C...

    Category: Engineering

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  •   What is the Slip ?

     The number of poles and the frequency applied determine the speed of the Motor This formula [Check the Image ]  includes an effect called "slip."

      What is the Slip ?


     Slip is the difference between the rotor speed and the rotating magnetic field in the stator. When a magnetic field passes through the conductors of the rotor, the rotor takes on magnetic fields of its own. These rotor magnetic fields will try to catch up to the rotating fields of the stator. However, it never does -- this difference is slip.


     Think of slip as the distance between the greyhounds and the hare they are chasing around the track. As long as they don't catch up to the hare, they will continue to revolve around the track. Slip is what allows a motor to turn.

  • What is the Slip ?

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    Created by Murad Al-Qasim

     The number of poles and the frequency applied determine the speed of the Motor This formula [C...

    Category: Engineering

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  • Capacitor in the Fan appliance

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    Created by Murad Al-Qasim

    Before Knowing the reason behinde the need of the Capacitor in the Single phase induction motor . We...

    Category: Engineering

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  • Created by Murad Al-Qasim

    Before Knowing the reason behinde the need of the Capacitor in the Single phase induction motor . We...

    Category: Engineering

    Capacitor in the Fan appliance

    Before Knowing the reason behinde the need of the Capacitor in the Single phase induction motor . We know that the ac supply is a sinusoidal wave and it produces pulsating magnetic field in uniformly distributed stator winding.


    Since pulsating magnetic field can be assumed as two oppositely rotating magnetic fields, there will be no resultant torque produced at the starting and due to this the motor does not run. After giving the supply, if the rotor is made to rotate in either direction by
    external force, then the motor will start to run. This problem has been solved by making the stator winding into two winding, one is main winding and another is auxiliary winding and a capacitor is fixed in series with the auxiliary winding. This will make a phase difference when current will flow through the both coils. When there will be phase difference, the rotor will generate a starting torque and it will start to rotate.


    Practically we can see that the fan does not rotate when the capacitor is disconnected from the motor but if we rotate with hand it will start to rotate.
    So this is the reason of using capacitor in the single phase induction motor.


    How do you know if the capacitor is damaged? These are the symptoms:-
    •the ceiling fan does not start but makes a humming noise
    •it spins very slowly
    •it spins only if you help it get started by pushing on the blades

  • Capacitor in the Fan appliance

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    Created by Murad Al-Qasim

    Before Knowing the reason behinde the need of the Capacitor in the Single phase induction motor . We...

    Category: Engineering

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  • Induction Motor

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     Induction motor [ asynchronous motor ] :  We called induction Motor as asynchronous Mot...

    Category: Engineering

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  • Created by Murad Al-Qasim

     Induction motor [ asynchronous motor ] :  We called induction Motor as asynchronous Mot...

    Category: Engineering

    Induction Motor

     Induction motor [ asynchronous motor ] :


     We called induction Motor as asynchronous Motor because it runs at a speed less than synchronous speed.

    Note :  Synchronous speed is the speed of rotation of the magnetic field in a rotary machine and it depends upon the frequency and number poles of the machine.

    Note :  induction motor always runs at a speed less than synchronous speed.

    Question : Why Induction Motor runs at a speed less than synchronous speed ?

    Answer : Because the rotating magnetic field which is produced in the stator will generate flux in the rotor which will make the rotor to rotate, but due to the lagging of flux current in the rotor with flux current in the stator, the rotor will never reach to its rotating magnetic field speed i.e. the synchronous speed.


    There are basically two types of induction motor that depend upon the input supply :

     1- single phase induction motor [ NOT a self starting motor ]
     2- 3-Phase induction motor.[ self-starting motor :starts running automatically without any external force to the machine ]

    In general we need to give two supply i.e. double excitation to make a machine to rotate. For example if we consider a DC motor, we will give one supply to
    the stator and another to the rotor through brush arrangement.


     
    - Working Principle of Induction Motor

    But in induction motor we give only one supply, so it is really interesting to know that how it works. It is very simple, from the name itself we can understand that there is induction process occurred. Actually when we are giving the supply to the stator winding, flux will generate in the coil due to flow of current in the coil. Now the rotor winding is arranged in such a way that it becomes short circuited in the rotor itself. The flux from the stator will cut the coil in the rotor and since the rotor coils are short circuited, according to Faraday’s law of electromagnetic induction, current will start flowing in the coil of the rotor. When the current will flow, another flux will get generated in the rotor. Now there will be two flux, one is stator flux and another is rotor flux and the rotor flux will be lagging to the stator flux. Due to this, the rotor will feel a torque which will make the rotor to rotate in the direction of rotating magnetic flux. So the speed of the rotor will be depending upon the ac supply and the speed can be controlled by varying the input supply. This is the working principle of an induction motor of either type.

    Types Induction Motor:

    SINGLE PHASE INDUCTION MOTOR

    1.Split phase induction motor
    2.Capacitor start induction motor
    3. Capacitor start capacitor run induction motor
    4.Shaded pole induction motor

    THREE PHASE INDUCTION MOTOR :

    1.Squirrel cage induction motor
    2. Slip ring induction motor

     

  • Induction Motor

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    Created by Murad Al-Qasim

     Induction motor [ asynchronous motor ] :  We called induction Motor as asynchronous Mot...

    Category: Engineering

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  • 3-Phase Induction Motor

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    A three phase induction motor is basically a constant speed motor so it’s somewhat difficult t...

    Category: Engineering

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  • 3-Phase Induction Motor

    A three phase induction motor is basically a constant speed motor so it’s somewhat difficult to control its speed.The speed control of induction motor is done at the cost of decrease in efficiency and low electrical power factor.
     Before discussing the methods to control the speed of three phase induction motor one should know the basic formulas of speed and torque of three phase induction motor as the methods of speed control depends upon these formulas. The speed control of three phase induction motor from stator side are further classified as :

    1.V / f control or frequency control.
    2.Changing the number of stator poles.
    3.Controlling supply voltage.
    4.Adding rheostat in the stator circuit.

    The speed controls of three phase induction motor from rotor side are further classified as:

    1.    Adding external resistance on rotor side.
    2.    Cascade control method.
    3.    Injecting slip frequency emf into rotor side.

     

  • 3-Phase Induction Motor

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    Created by Murad Al-Qasim

    A three phase induction motor is basically a constant speed motor so it’s somewhat difficult t...

    Category: Engineering

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