Homework Answers
Function of commutator switch in DC motor
A DC motor is a a electromechanical rotating machine which converts electrical energy into mechanical energy. We know that DC motor producers torque when two magnetic field interacts. One magnetic fields is generated by the current carrying stator winding and the other by current carrying armature winding. Now since the armature winding is placed on rotor therefore in order to supply DC current to the armature winding the machine is provided with commutator.
In simple words the commutator functions as the converter and feeds DC current to the rotor winding by converting it from the AC current which is useful in generating the required magnetic field for torque production.
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b) Explain the function of commutator switch in a DC motor. (2 marks)
Question 17 (9 points) (a) Label the parts of the DC motor. (5 marks) 1 2...
Question 17 (9 points) (a) Label the parts of the DC motor. (5 marks) 1 2 3 5 (b) Explain the Motor Principle in relation to the operation of the DC motor. ( marks) (c) Explain the role of the commutator in the DC motor. (2 marks)
What in a DC motor reverses the polarity and current each half-cycle? A) solid ring commutator...
What in a DC motor reverses the polarity and current each half-cycle? A) solid ring commutator B) fuse C) a CRT D) a split ring commutator
I have a project where I am to build a DC motor with a commutator and...
I have a project where I am to build a DC motor with a commutator and brushes out of simple materials, such as scrap wood, magnet copper wire, permanent magnets and a 9V battery. I have already assembled the motor. When I connect the 9V battery, the coils do have a magnetic field as they will attract a paperclip, but the armature won't turn. If I give it a push, they become attracted to the permanent magnets on each side...
QUESTION 2 [20 marks] (i) [10 marks] A 120-V dc generator energizes a motor whose coil...
QUESTION 2 [20 marks] (i) [10 marks] A 120-V dc generator energizes a motor whose coil has an inductance of 50 H in series with a resistance of 100 2. A field discharge resistor of 400 2 is connected in parallel with the motor to avoid damage to the motor, as shown in Figure 3. Find the current through the discharge resistor 100 ms after the breaker is tripped. (The circuit breaker has been in the closed position for a...
(a) Define the commutator of the operators and Ω2. (2 marks) (b) Determine the commutators of the...
(a) Define the commutator of the operators and Ω2. (2 marks) (b) Determine the commutators of the operators: (ii) Ω,-d/dx and Ω,-x? (12 marks)
(a) Define the commutator of the operators and Ω2. (2 marks) (b) Determine the commutators of the operators: (ii) Ω,-d/dx and Ω,-x? (12 marks)
Consider the transfer function of a DC motor given by G(s) = 1 / s(s+2) 3. Consider the transfer function of a DC motor...
Consider the transfer function of a DC motor given by G(s) = 1 /
s(s+2)
3. Consider the transfer function of a DC motor given by 1 G(s) s (s2) The objective of this question is to consider the problem of control design for this DC motor, with the feedback control architecture shown in the figure below d(t r(t) e(t) e(t) C(s) G(s) Figure 4: A feedback control system (a) Find the magnitude and the phase of the frequency response...
Explain the characteristics curve of i. Dc shunt motor ii. Dc series motor iii. Dc compound...
Explain the characteristics curve of i. Dc shunt motor ii. Dc series motor iii. Dc compound motor
Q1b) DC Machines [ 6 marks ] You are given a 24 V DC motor. When...
Q1b) DC Machines [ 6 marks ] You are given a 24 V DC motor. When you connect it to a 24 V supply, under no-load conditions it spins at 2,000 rpm. With the same 24 V supply, when the motor is stalled, the input current is 50 A. i) Calculate the back-emf constant and hence the stall torque of the motor. Find also the armature resistance. [3 marks ] ii) The DC motor has a rated input current of...
A separately excited DC motor is fed from a variable DC source and it drives a...
A separately excited DC motor is fed from a variable DC source and it drives a variable mechanical load as shown in Figure Q4b. The excitation current If is held constant during the motor operation. (i) How can the motor direction be reversed? (4 marks) (ii) Explain what will happen to the current Ia, the internal voltage Eg, and speed if the mechanical torque increases whilst the DC input voltage VT is held constant. (4 marks) (iii)Explain what will happen...
5. Explain the condition for a DC motor to develop the maximum power. If a DC...
5. Explain the condition for a DC motor to develop the maximum power. If a DC machine having an armature resistance of 0.5Ω and the full load current of 20 A. Find the induced emf of machine when it acts as: (i) Motor and (ii) Generator
Question 17 (9 points) (a) Label the parts of the DC motor. (5 marks) 1 2 3 5 (b) Explain the Motor Principle in relation to the operation of the DC motor. ( marks) (c) Explain the role of the commutator in the DC motor. (2 marks)
QUESTION 2 [20 marks] (i) [10 marks] A 120-V dc generator energizes a motor whose coil has an inductance of 50 H in series with a resistance of 100 2. A field discharge resistor of 400 2 is connected in parallel with the motor to avoid damage to the motor, as shown in Figure 3. Find the current through the discharge resistor 100 ms after the breaker is tripped. (The circuit breaker has been in the closed position for a...
(a) Define the commutator of the operators and Ω2. (2 marks) (b) Determine the commutators of the operators: (ii) Ω,-d/dx and Ω,-x? (12 marks)
(a) Define the commutator of the operators and Ω2. (2 marks) (b) Determine the commutators of the operators: (ii) Ω,-d/dx and Ω,-x? (12 marks)
Consider the transfer function of a DC motor given by G(s) = 1 /
s(s+2)
3. Consider the transfer function of a DC motor given by 1 G(s) s (s2) The objective of this question is to consider the problem of control design for this DC motor, with the feedback control architecture shown in the figure below d(t r(t) e(t) e(t) C(s) G(s) Figure 4: A feedback control system (a) Find the magnitude and the phase of the frequency response...
Q1b) DC Machines [ 6 marks ] You are given a 24 V DC motor. When you connect it to a 24 V supply, under no-load conditions it spins at 2,000 rpm. With the same 24 V supply, when the motor is stalled, the input current is 50 A. i) Calculate the back-emf constant and hence the stall torque of the motor. Find also the armature resistance. [3 marks ] ii) The DC motor has a rated input current of...
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