Q6] A dc motor is a fairly simple electric motor that uses electricity and magnetic field t generate torque, which turns the rotor and hence give mechanical work. It can be modelle by the following differential equation: d w(t) J + (b + K₂ K¹) w(t) = K₁ v(t) . dt Ra Ra Where w(t) is the angular velocity of the motor and v(t) is the voltage applied. The constam J,b, and K, are associated with mechanical parts of the motor while Ke and Ra a associated with electrical parts of the motor. All mechanical and electrical parameters a assumed to be positive.

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Q6]
A de motor is a fairly simple electric motor that uses electricity and magnetic field to
generate torque, which turns the rotor and hence give mechanical work. It can be modelled
by the following differential equation:
Ja
d w (t)
dt
+ (b + K₂ K) w(t) = Kt v(t)
e
Ra
Where w (t) is the angular velocity of the motor and v(t) is the voltage applied. The constants
J, b, and K, are associated with mechanical parts of the motor while Ke and Ra are
associated with electrical parts of the motor. All mechanical and electrical parameters are
assumed to be positive.
a) Define the input and output of the motor and their units.
b) Is the time-model differential equation describing the motor dynamic behavior linear
time-invariant? Justify your answer.
c) Let W(s) and V(s) denote the Laplace transforms of w(t) and v(t) respectively.
Show that the transfer function from V(s) to W (s) is :
T(s) =
W(s) x
V(s) s+ß
=
Kt
Kt
Where x= K and B = + Koke).
J Ra
J Ra
d) Represent the system in the form of a block diagram.
e) Determine the value of the steady-state gain K and the time constant T in terms of
and ß.
f) Compute the pole of the motor model and conclude about its stability.
g) Show that the step response of the dc motor, i.e. the angular velocity w(t) when v(t)
is a unit step u(t), is given by :
w (t) = (1 - e-Bt) u(t).
Transcribed Image Text:Q6] A de motor is a fairly simple electric motor that uses electricity and magnetic field to generate torque, which turns the rotor and hence give mechanical work. It can be modelled by the following differential equation: Ja d w (t) dt + (b + K₂ K) w(t) = Kt v(t) e Ra Where w (t) is the angular velocity of the motor and v(t) is the voltage applied. The constants J, b, and K, are associated with mechanical parts of the motor while Ke and Ra are associated with electrical parts of the motor. All mechanical and electrical parameters are assumed to be positive. a) Define the input and output of the motor and their units. b) Is the time-model differential equation describing the motor dynamic behavior linear time-invariant? Justify your answer. c) Let W(s) and V(s) denote the Laplace transforms of w(t) and v(t) respectively. Show that the transfer function from V(s) to W (s) is : T(s) = W(s) x V(s) s+ß = Kt Kt Where x= K and B = + Koke). J Ra J Ra d) Represent the system in the form of a block diagram. e) Determine the value of the steady-state gain K and the time constant T in terms of and ß. f) Compute the pole of the motor model and conclude about its stability. g) Show that the step response of the dc motor, i.e. the angular velocity w(t) when v(t) is a unit step u(t), is given by : w (t) = (1 - e-Bt) u(t).
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