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    Learning Materials For EE 422 L: A Developed Laboratory Manual

    Uploaded by

    Arnel Pamaos Lopiba Montañez
    The document provides details on an experiment performed on an AC series motor, including objectives, theory, procedures, data collection, computations, and conclusions. Key points include: 1) AC series motors operate similarly to DC series motors but with modifications to reduce eddy currents and improve power factor; 2) test results show the motor draws 25A at 240V, has an 86% power factor, and efficiency of 83.33% at 300rpm under 10Nm of torque; 3) conclusions note AC series motors produce torque in one direction and are well-suited for applications requiring high starting torque and speed like sewing machines and power tools.

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

    Learning Materials For EE 422 L: A Developed Laboratory Manual

    Uploaded by

    Arnel Pamaos Lopiba Montañez
    34 views5 pages
    The document provides details on an experiment performed on an AC series motor, including objectives, theory, procedures, data collection, computations, and conclusions. Key points include: 1) AC series motors operate similarly to DC series motors but with modifications to reduce eddy currents and improve power factor; 2) test results show the motor draws 25A at 240V, has an 86% power factor, and efficiency of 83.33% at 300rpm under 10Nm of torque; 3) conclusions note AC series motors produce torque in one direction and are well-suited for applications requiring high starting torque and speed like sewing machines and power tools.

    Original Title

    Activity No. 4

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    The document provides details on an experiment performed on an AC series motor, including objectives, theory, procedures, data collection, computations, and conclusions. Key points include: 1) AC series motors operate similarly to DC series motors but with modifications to reduce eddy currents and improve power factor; 2) test results show the motor draws 25A at 240V, has an 86% power factor, and efficiency of 83.33% at 300rpm under 10Nm of torque; 3) conclusions note AC series motors produce torque in one direction and are well-suited for applications requiring high starting torque and speed like sewing machines and power tools.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    34 views5 pages

    Learning Materials For EE 422 L: A Developed Laboratory Manual

    Uploaded by

    Arnel Pamaos Lopiba Montañez
    The document provides details on an experiment performed on an AC series motor, including objectives, theory, procedures, data collection, computations, and conclusions. Key points include: 1) AC series motors operate similarly to DC series motors but with modifications to reduce eddy currents and improve power factor; 2) test results show the motor draws 25A at 240V, has an 86% power factor, and efficiency of 83.33% at 300rpm under 10Nm of torque; 3) conclusions note AC series motors produce torque in one direction and are well-suited for applications requiring high starting torque and speed like sewing machines and power tools.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    Learning Materials for EE 422 L: A Developed Laboratory Manual

    Activity No. 4 Date Performed: 07/25/2021


    Rating: _____________ Date Submitted: _______________

    The AC series motor

    I. Objectives

    1. To demonstrate the operating characteristics of an AC series motor.


    2. To determine the load characteristics of AC series motor in terms
    of N, I, cos theta, P2, s, and n as a function of torque.

    II. Materials/Apparatus

    III. Circuit Diagram

    1
    IV. Theory

    AC series motors are also known as the modified DC series motor


    as their construction is very similar to that of the DC series motor.
    Before we discuss these modifications, here it is essential to discuss
    what is the need and where do we need to do modifications. In order
    to understand this, consider this question. What will happen when we
    give an AC supply to DC series motor? Answer to this question is
    written below:

    An AC supply will produce an unidirectional torque because the


    direction of both the currents (i.e. armature current and field current)
    reverses at the same time.

    Due to presence of alternating current, eddy currents are induced


    in the yoke and field cores which results in excessive heating of the
    yoke and field cores.
    Due to the high inductance of the field and the armature circuit, the
    power factor would become very low.

    There is sparking at the brushes of the DC series motor.


    So considering above points we can say that we don’t have good
    performance of DC series motor on the application of AC supply. Now
    in order to reduce the eddy currents there is need to laminate the
    yoke and field core. This is our first modification to DC series motor.

    What about power factor how we can improve power factor? Now
    the power factor is directly related to reactance of the field and

    2
    armature circuit and we can reduce the field winding reactance by
    reducing the number of turns in the field winding.

    V. Procedures

    3
    VI. Data and Results

    Measured values
    Parameter Trials
    1 2 3 4 5 6 7
    Torque 10 10 10 10 10 10 10
    (Nm)
    Voltage(V) 240 240 240 240 240 240 240
    Current 25 25 25 25 25 25 25
    (A)
    Power 86% 86% 86% 86% 86% 86% 86%
    Factor
    Speed 300 300 300 300 300 300 300
    (rpm)
    Power 18850 18850 18850 18850 18850 18850 18850
    Input (W)

    Calculated Value
    Apparent 16.63 16.63 16.63 16.63 16.63 16.63 16.63
    Power
    (VA)

    4
    Power 15708 15708 15708 15708 15708 15708 15708
    Output
    (W)
    Efficiency 83.33 83.33% 83.33 83.33% 83.33 83.33 83.33%
    (%) % % % %
    Slip (s) 16.67 16.67% 16.67 16.67% 16.67 16.67 16.67%
    % % % %

    VII. Computation

    APPARENR POWER : S= 1.732Va/Ia


    S= 1.732(240)/25= 16.63 VA

    Power Output (W): P= 2����


    P=2�(10)X(250)= 15708 W

    Efficiency (%):n=(P2/P1)X100%
    n=(15708/18850)x100%= 83.33%

    Slip (s): (Ns-Nr/Ns)x100%


    s=(300-250/300)x100%
    s=16.67%

    VIII. Observation/Conclusion/Generalization
    The working principle is the same as the DC series motor. When
    the AC series motor connected to the AC supply the alternating current start
    to flowing through the field and the armature winding. The field winding
    produces an alternating flux that reacts with current flowing in armature
    winding to produce a torque. Since both armature and field current reverse
    simultaneously. The torque always produced in the same direction. Due to its
    high starting torque and high speed, its find more application like the sewing
    machines, high-speed vacuum cleaner, electric shavers, and used in drills and
    power tools.

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