A motor is designed to operate on 117 V and draws a current of 12.3 A when it first starts up. At its normal operating speed, the motor draw

Question

A motor is designed to operate on 117 V and draws a current of 12.3 A when it first starts up. At its normal operating speed, the motor draws a current of 3.38 A. Obtain (a) the resistance of the armature coil, (b) the back emf developed at normal speed, and (c) the current drawn by the motor at one-third normal speed

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Thiên Ân 5 years 2021-08-12T07:31:46+00:00 1 Answers 187 views 0

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  1. giabao
    0
    2021-08-12T07:33:12+00:00
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    Answer:

    a) using

    R=V/I =117/12.3

    R=9.5 ohms

    b)

    E=V-I*R =117-3.38*9.5

    E=84.8Volts

    c)

    at (1/3)rd of normal speed ,back emf is (1/3) of its maximum

    value

    E=(1/3)*84.8=28.3Volts

    Current drawn

    I=V-Eback/R =117-28.3/9.5

    I=9.33A

    Explanation:

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