a) Describe how each of the following can be achieved
i. Controlling a DC motor with pulse width modulator.
ii. Controlling a stepper motor that has a built-in controller.
Use matlab to solve the following:
A field-controlled DC motor can be described by the following
differential equation:
ay3(t)+by2(t)+cy1(t) =
dx(t)
Where y(t) is the angle displacement of the motor’s load and
x(t) is the applied voltage to the motor. The applied voltage is DC
that turns on at t = 0, which is a step function. The
values for a,b,c and d are derived from the model of the field
controlled DC motor. This is a concept that is...
I have a question for the effect and difference on a DC motor
for the speed( rad/s) in time (sec) if you apply:
1. Nothing (so no charge in the circuit only the mecanic charge
of the generator)
2. A resistant charge (only the resistant is plug in with the
generator)
3. Short circuit (No exterior electric charge but the terminals
are bounds together so an excessive amount of current flow into the
circuit)
4. Capacitive charge (only the capacitor...
State four (4) possible causes each of the following
troubles in dc motor and suggest two
solutions to avert them:
(i) sparking at brushes, and (ii) overheating.
(a)
In DC motor, quadrant of operation can be defined by the
armature voltage and
current of the motor. By using an appropriate diagram, briefly
explain the
definition of all four quadrant of operation based on armature
voltage and current.
(b)
A chopper is used to control speed of 45.36 kW, 1750 rpm, 240 V,
189 A
permanent magnet DC motor with 0.01 Ω armature resistance. This
chopper-fed
DC motor is able to operate in both motoring and braking
mode...
Suggest a DC motor drive which can cause very fast heating of an
automobile? Show circuit
diagram in case of series excited motor. (2). Propose an energy
efficient braking control mechanism that
can be used for practical traction systems.(Hint: The supply is
partly receptive)