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    Manoj Gupta
    This document describes a procedure to perform a load test on a DC shunt motor. Key details include: - The test is performed on a 5HP, 220V, 20.5A DC shunt motor to obtain its operating characteristics under varying loads. - Load is applied using a belt-pulley arrangement and tensions are measured to calculate motor output power. - Motor speed, voltage, and current are recorded at different loads to plot graphs of efficiency vs output, speed vs output, and other relationships. - The goal is to understand the motor's performance under different loading conditions.

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

    2 Machine Lab

    Uploaded by

    Manoj Gupta
    25 views4 pages
    This document describes a procedure to perform a load test on a DC shunt motor. Key details include: - The test is performed on a 5HP, 220V, 20.5A DC shunt motor to obtain its operating characteristics under varying loads. - Load is applied using a belt-pulley arrangement and tensions are measured to calculate motor output power. - Motor speed, voltage, and current are recorded at different loads to plot graphs of efficiency vs output, speed vs output, and other relationships. - The goal is to understand the motor's performance under different loading conditions.

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    This document describes a procedure to perform a load test on a DC shunt motor. Key details include: - The test is performed on a 5HP, 220V, 20.5A DC shunt motor to obtain its operating characteristics under varying loads. - Load is applied using a belt-pulley arrangement and tensions are measured to calculate motor output power. - Motor speed, voltage, and current are recorded at different loads to plot graphs of efficiency vs output, speed vs output, and other relationships. - The goal is to understand the motor's performance under different loading conditions.

    Copyright:

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

    2 Machine Lab

    Uploaded by

    Manoj Gupta
    This document describes a procedure to perform a load test on a DC shunt motor. Key details include: - The test is performed on a 5HP, 220V, 20.5A DC shunt motor to obtain its operating characteristics under varying loads. - Load is applied using a belt-pulley arrangement and tensions are measured to calculate motor output power. - Motor speed, voltage, and current are recorded at different loads to plot graphs of efficiency vs output, speed vs output, and other relationships. - The goal is to understand the motor's performance under different loading conditions.

    Copyright:

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

    N

    3 Point DC Stvo
    N

    ES

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    N

    3 Point DC Startor
    National Institute of Technology, Raipuur
    Electrical Engineering Department

    LOADTEST ON DC SHUNT MOTOR


    AIM: To perform load test on DC shunt motor.

    APPARATUS REQUIRED:
    1. Ammeters (0-2.5 A) & (0-25 A)
    2. Voltmeter (0-300 V)
    3. DC supply
    4. Shunt motor 5 hp, 220 V, 20.5 A, 1400 rpm
    5. Belt-pulley loading arrangement
    6. Connecting wires

    THEORY:
    shunt across the power source in a
    The field coil and the armature winding are connected in
    has its ends attached to spring
    DC shunt motor. A belt around the air or water cooled pulley
    balances.
    and therefore on the motor. If
    The tightening of belt help in adjusting a load on the pulley
    spring balances are calibrated in pounds, the motor output given by
    is

    Motor output = 0.45roT, -T9.81 watts


    Where: Ti and T2 are tensions on the tight and slack sides of the belt (in pound),
    ris effective radius of belt-pulley in metres,

    27whereNis speed in r.p.m.


    60

    Motor efficiency (0.45roT-1P> 00


    VIL

    For different loading percentage efficiency can be found


    out.

    Then plot the Efficiency verses output curve.


    characteristics:
    Following graphs will give the motor's operating
    Speed vs Amature current
    Torque vs Armature current
    Speed vs Torque
    Speed vs output

    PROCEDURE:
    1. Connect voltmeter & ammeter according to the circuit diagram with the hclp of
    connecting wires.
    2. Start the motor and slightly increase the load step wise and note the corresponding
    tensions.
    3. Note down the voltage and current relative to the speed of motor.

    B.TECH III Sem EE Electrical Machine Lab-1 [EL20323]


    National Institute of Technology, Raipur
    Electrical Engineering Department

    CIRCUIT DIAGRAM:

    Z1 Z2

    0-2.5 A

    Al A2
    T T2
    TM
    0-300 V

    -L
    0-25A

    IsUPPLY
    220V DC

    OBSERVATION TABLE:
    S.No. V N Input Output
    (volt) (Amp) (Amp) Pound) (Pound) (rpm)(Watts) (Watts) (%)

    RESULT:
    Load test on DC shunt motor has been performed and
    Then following graphs are plotted:
    Eficiency verses output,
    Speed vs output,
    Load current vs output.
    Speed vs Armature curent
    Torque vs Armature cureent
    Speed vs Torque

    PRECAUTiONS:
    1. Instruments must be of required range.
    2. Increase the load stepwise.
    3. Connections should be propcr and tight.
    4. Do not touch any open terminal
    during the experiment.
    B.TECH II Sem EE Electrical Machine Lab-1 |EL20323]

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