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Calculate the resistance of the field coil. Show your calculations results table incase needed(don't think it is for this question)-

Calculate the resistance of the field coil. Show your calculations results table incase needed(don't think it is for this question)-

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Calculate the resistance of the field coil. Show your calculations

results table incase needed(don't think it is for this question)-

Field current (If) flux density(B) in mT
0 0.01
0.25 0.11
0.50 0.20
0.75 0.29
1.00 0.36
1.25 0.40
1.50 0.43
1.75 0.45
2.00 0.47
Armature winding resistance Ra 4.2 Q Field winding resistance Rf 8.4 N Number of turns on armature Na 108 Number of turns on field coils Nf 300 Radial Air gap 0.53 mm Rotor Diameter 33 mm Axial Length L 31 mm Pole Arc / Pitch ratio 0.67 Voltage Rating Vmax 24 V Current Rating 'max 1.2 A
Transcribed Image Text:Armature winding resistance Ra 4.2 Q Field winding resistance Rf 8.4 N Number of turns on armature Na 108 Number of turns on field coils Nf 300 Radial Air gap 0.53 mm Rotor Diameter 33 mm Axial Length L 31 mm Pole Arc / Pitch ratio 0.67 Voltage Rating Vmax 24 V Current Rating 'max 1.2 A
Part 4: Observing the magnetic field generated by the motor coils In this activity, you will make a series of measurements of the magnetic field in the motor apparatus. You will then analyse a set of data from the experiment and answer some questions. a) Connect one part of the DC power supply across the full field winding by connecting the power supply to connections F1 and F3 on the motor apparatus. Set the supply current limit to zero and the voltage limit to maximum. Turn on the power supply and also the supply to the motor unit. b) Record the field current lf and the magnetic flux density B for about ten values of current from 0 to 2A. (Do not leave the current higher than 1A for longer than necessary to take the readings). c) When you are finished the measurements, check that you have set the current to 0 A d) In your lab notebook, plot a rough graph of B against If from your results. e) Reverse the connections on the apparatus so that the current flows in the opposite direction. Measure the field for two different settings of the current and record the value of B in your lab notes. f) Check that you have set the current to 0 A. g) What is the effect of reversing the direction of current flow ? Record your answer in your lab notes
Transcribed Image Text:Part 4: Observing the magnetic field generated by the motor coils In this activity, you will make a series of measurements of the magnetic field in the motor apparatus. You will then analyse a set of data from the experiment and answer some questions. a) Connect one part of the DC power supply across the full field winding by connecting the power supply to connections F1 and F3 on the motor apparatus. Set the supply current limit to zero and the voltage limit to maximum. Turn on the power supply and also the supply to the motor unit. b) Record the field current lf and the magnetic flux density B for about ten values of current from 0 to 2A. (Do not leave the current higher than 1A for longer than necessary to take the readings). c) When you are finished the measurements, check that you have set the current to 0 A d) In your lab notebook, plot a rough graph of B against If from your results. e) Reverse the connections on the apparatus so that the current flows in the opposite direction. Measure the field for two different settings of the current and record the value of B in your lab notes. f) Check that you have set the current to 0 A. g) What is the effect of reversing the direction of current flow ? Record your answer in your lab notes
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