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    Sourav Dutta: Dynamic Braking Operation of An Induction Motor Using Matlab

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    Sourav Dutta
    The document describes an experiment to observe the dynamic braking operation of an induction motor using MATLAB. The objective is to plot the speed, torque, and current waveforms. During dynamic braking, the stator is disconnected from the AC supply and connected to a DC supply, producing a stationary magnetic field. This causes a braking torque as the rotor continues to rotate in the stationary field. Parameters and circuit diagrams for the motoring and braking conditions are provided.

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    Sourav Dutta: Dynamic Braking Operation of An Induction Motor Using Matlab

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    Sourav Dutta
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    The document describes an experiment to observe the dynamic braking operation of an induction motor using MATLAB. The objective is to plot the speed, torque, and current waveforms. During dynamic braking, the stator is disconnected from the AC supply and connected to a DC supply, producing a stationary magnetic field. This causes a braking torque as the rotor continues to rotate in the stationary field. Parameters and circuit diagrams for the motoring and braking conditions are provided.

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    The document describes an experiment to observe the dynamic braking operation of an induction motor using MATLAB. The objective is to plot the speed, torque, and current waveforms. During dynamic braking, the stator is disconnected from the AC supply and connected to a DC supply, producing a stationary magnetic field. This causes a braking torque as the rotor continues to rotate in the stationary field. Parameters and circuit diagrams for the motoring and braking conditions are provided.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    26 views4 pages

    Sourav Dutta: Dynamic Braking Operation of An Induction Motor Using Matlab

    Uploaded by

    Sourav Dutta
    The document describes an experiment to observe the dynamic braking operation of an induction motor using MATLAB. The objective is to plot the speed, torque, and current waveforms. During dynamic braking, the stator is disconnected from the AC supply and connected to a DC supply, producing a stationary magnetic field. This causes a braking torque as the rotor continues to rotate in the stationary field. Parameters and circuit diagrams for the motoring and braking conditions are provided.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 4

    SOURAV DUTTA

    EE / 12 / 4th YEAR / 7th SEM

    EXPERIMENT NO: EE_7drives_08

    (EE-791)

    EXPERIMENT NO: EE_7drives_09

    TITLE: DYNAMIC BRAKING OPERATION OF AN INDUCTION MOTOR USING


    MATLAB.

    OBJECT: To observe the dynamic braking operation of a given induction motor using Matrix
    Laboratory and to plot the speed, torque and current waveforms.

    THEORY: Dynamic braking of an induction motor is achieved by disconnecting the stator


    terminals from the ac supply and connecting it to the dc supply. During dynamic braking, stator
    produces a stationary magnetic field and the rotor continues to rotate in this stationary field.
    Alternating current is thus induced in the rotor windings. This rotor current flows in the direction
    opposite to that corresponding to the motoring action. Hence, a braking torque is produced.
    So, for dynamic braking operation the relative speed between rotor and the stationary magnetic
    field is Nr rpm where Nr is the speed of the rotor when the braking is initialized.
    Hence, the dynamic braking slip =

    Where, Sm is the slip during motoring operation.

    CIRCUIT DIAGRAM:

    Fig.9a: Motoring Operation Fig.9b: Dynamic Braking Operation


    exp9

    DYNAMIC BRAKING OPERAT ION OF AN INDUCTION MOTOR

    0.0781 Tm <Stator current is_a (A)>


    MOTORING Constant
    SG1
    g <Stator current is_b (A)>
    2 A
    1
    +
    SG2 m <Stator current is_c (A)>
    g
    2 B Scope

    <Electromagnetic torque Te (N*m)>

    -K-
    <Rotor speed (wm)> Rotor Speed (ωm)
    Gain1
    Scope2
    Asynchronous Machine

    C:\Users\Sourav\Desktop\MATLAB projct\7th sem\Dyn Brkng of IM\exp9.slx

    printed 27-Sep-2020 20:12 page 1/1


    SOURAV DUTTA / EE / 12------------------------------------- ELECTRICAL DRIVES LABORATORY EE791
    PARAMETERS:-
    1. Ideal Switch Motoring Condition (GREEN): Internal resistance, Ron = 1e-4.
    Initial State: 1.
    Snubber Resistance, Rs= Inf.
    Snubber Capacitance, Cs=0.
    2. Ideal Switch Braking Condition (RED): Internal resistance, Ron = 1e-4.
    Initial State: 0.
    Snubber Resistance, Rs= Inf.
    Snubber Capacitance, Cs=0.
    3. Stair Generators: Running conditions: Time(s): [0 0.5 5], Amplitude: [0 1 0]
    Braking Conditions: Time(s): [0 5], Amplitude: [0 1]
    4. Source Voltages: i) Va = 326.59 V Phase Angle:0°
    ii) Vb = 326.59 V Phase Angle:240°
    iii) Vc = 326.59 V Phase Angle:120°
    5. Resistances: R1=0.5Ω, R2=0.5Ω, R3=0.5Ω; Braking Resistances, R=100 Ω, R4=100 Ω
    6. Constant: 0.154
    7. Gain: To convert rad/sec to RPM, the rad/sec is multiplied with 9.54.
    8. Machine used: ASYNCHRONOUS MACHINE SI UNIT

    REPORTS:-

    2. What are the different methods of dynamic braking for induction machines?
    Ans: -
    The different methods of dynamic braking: -
    a. AC Dynamic Braking – The dynamic braking is obtained when the motor is run on the
    singlephase supply by disconnecting the one phase from the source and either leaving it open or
    connecting it with another phase. The two connections are respectively known as two and
    three lead connection.
    b. Self-Excited Braking Using Capacitor – In this method the three capacitors are
    permanently
    connected to the motor. The value of the capacitor is so chosen that when disconnecting
    from the line, the motor works as a self-excited induction generator.
    c. DC Dynamic Braking – In this method, the stator of induction is connected across the DC
    supply.
    d. Zero Sequence Braking – In this braking, the three phases of the stator are connected in
    series across either a single AC or DC source. Such type of connection is known as zero
    sequence connection because the current in all the three phases is co-phase.

    Graphs below

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