Question

4) A permanent-magnet DC motor has the following specifications: Motor Armature Supply Voltage = VM = VA = 15 V Motor Armature Resistance = RA = 6 ? Motor Armature Current = IA = 200 mA Motor speed = NM = 9000 rpm Find the motor back emf proportionality constant (K') of the motor. 5) The armature voltage supplied to the motor of the previous problem is now VM = VA = 9 V and the motor armature current is now IA = 500 mA (with mechanical load). Find the speed (Nm) of the motor operating with the new given conditions (and use the values of RA and Kb' from problem 4 along with the new conditions given in this problem 5 in your calculations). Hint: Your answer for the speed should be less than the speed of problem 4. 6) A permanent-magnet DC motor has the following specifications: Motor Armature Supply Voltage = VM = VA = 12 V Motor Armature Resistance = RA = 9 ? Motor Armature Current = IA = 300 mA Motor back emf proportionality constant = K' = 800 x 10$^{-6}$ V/rpm Find the speed (Nm) of the motor. 7) A permanent-magnet DC motor has the following specifications: Motor Armature Supply Voltage = VM = VA = 18 V Motor Armature Resistance = RA = 14 ? Motor back emf proportionality constant = K' = 1.2 x 10$^{-3}$ V/rpm Motor speed = NM = 7000 rpm Find the motor armature current (IA) through the motor armature.

          4) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 15 V
Motor Armature Resistance = RA = 6 ?
Motor Armature Current = IA = 200 mA
Motor speed = NM = 9000 rpm
Find the motor back emf proportionality constant (K') of the motor.
5) The armature voltage supplied to the motor of the previous problem is now VM = VA = 9 V
and the motor armature current is now IA = 500 mA (with mechanical load). Find the
speed (Nm) of the motor operating with the new given conditions (and use the values of RA and Kb'
from problem 4 along with the new conditions given in this problem 5 in your calculations).
Hint: Your answer for the speed should be less than the speed of problem 4.
6) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 12 V
Motor Armature Resistance = RA = 9 ?
Motor Armature Current = IA = 300 mA
Motor back emf proportionality constant = K' = 800 x 10$^{-6}$ V/rpm
Find the speed (Nm) of the motor.
7) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 18 V
Motor Armature Resistance = RA = 14 ?
Motor back emf proportionality constant = K' = 1.2 x 10$^{-3}$ V/rpm
Motor speed = NM = 7000 rpm
Find the motor armature current (IA) through the motor armature.

4) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 15 V
Motor Armature Resistance = RA = 6 ?
Motor Armature Current = IA = 200 mA
Motor speed = NM = 9000 rpm
Find the motor back emf proportionality constant (K') of the motor.
5) The armature voltage supplied to the motor of the previous problem is now VM = VA = 9 V
and the motor armature current is now IA = 500 mA (with mechanical load). Find the
speed (Nm) of the motor operating with the new given conditions (and use the values of RA and Kb'
from problem 4 along with the new conditions given in this problem 5 in your calculations).
Hint: Your answer for the speed should be less than the speed of problem 4.
6) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 12 V
Motor Armature Resistance = RA = 9 ?
Motor Armature Current = IA = 300 mA
Motor back emf proportionality constant = K' = 800 x 10^-6 V/rpm
Find the speed (Nm) of the motor.
7) A permanent-magnet DC motor has the following specifications:
Motor Armature Supply Voltage = VM = VA = 18 V
Motor Armature Resistance = RA = 14 ?
Motor back emf proportionality constant = K' = 1.2 x 10^-3 V/rpm
Motor speed = NM = 7000 rpm
Find the motor armature current (IA) through the motor armature.

Added by Victoria D.

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