Get premium membership and access questions with answers, video lessons as well as revision papers.
Switched Reluctance Motor :
This type of motor has either conventional split phase stator and a centrifugal switch for
cutting off auxiliary winding or a stator similar to that of permanent split capacitor run motor.
The stator produces resolving field. The working of this motor is that when a piece of
magnetic material is located in a magnetic field, a force acts on the material, tending to bring
it into the most dense portion of a field. The force tends to align the specimen of material in
such a way that the reluctance of the magnetic paths that lies through the material will be
minimum.
When stator winding is energized, the revolving magnetic field exerts reluctance
torque on the unsymmetrical rotor tending to align the salient pole axis of the rotor with the
axis of resolving magnetic field. If the reluctance torque is sufficient to start the motor and
its load, the rotor will pull into step with the revolving field and continue to run at speed of
revolving field. However, rotor poles lag behind stator poles by certain angle known as
torque angle.
The constant speed characteristic of a reluctance motor makes it very suitable for
signaling devices, recording instruments, timers, phonograph etc.
gregorymasila answered the question on February 22, 2018 at 16:32
- What are the advantages of high voltage transmission and its limitations(Solved)
What are the advantages of high voltage transmission and its limitations
Date posted: February 22, 2018. Answers (1)
- What are the criteria for the classification of transmission lines as short, medium and long lines?(Solved)
What are the criteria for the classification of transmission lines as short, medium and long lines?
Date posted: February 22, 2018. Answers (1)
- Describe the construction of a lead acid cell and explain the process of charging and discharging of the cell(Solved)
Describe the construction of a lead acid cell and explain the process of charging and discharging of the cell.
Date posted: February 22, 2018. Answers (1)
- Write notes on the following
(i) Differential relays.
(ii) Inductive interference in a transmission line.
(iii) Nickel-cadmium cells.(Solved)
Write notes on the following
(i) Differential relays.
(ii) Inductive interference in a transmission line.
(iii) Nickel-cadmium cells.
Date posted: February 22, 2018. Answers (1)
- Describe a typical coreless type of induction furnace and its special features(Solved)
Describe a typical coreless type of induction furnace and its special features
Date posted: February 22, 2018. Answers (1)
- Describe the primary and back-up protection features that are provided for transmission lines(Solved)
Describe the primary and back-up protection features that are provided for transmission lines.
Date posted: February 22, 2018. Answers (1)
- List out the important advantages of HVDC transmission(Solved)
List out the important advantages of HVDC transmission
Date posted: February 22, 2018. Answers (1)
- Give a list of the factors involved for selecting a factory drive(Solved)
Give a list of the factors involved for selecting a factory drive
Date posted: February 22, 2018. Answers (1)
- What are the factors which are involved in circuit breaker rating?(Solved)
What are the factors which are involved in circuit breaker rating?
Date posted: February 22, 2018. Answers (1)
- Write short note about following(i) Wave energy. (ii) Ocean thermal energy(Solved)
Write short note about following(i) Wave energy. (ii) Ocean thermal energy
Date posted: February 22, 2018. Answers (1)
- Derive the hystersis torque expression of the hystersis motor.(Solved)
Derive the hystersis torque expression of the hystersis motor.
Date posted: February 22, 2018. Answers (1)
- Write short notes on Energy conservation(Solved)
Write short notes on Energy conservation
Date posted: February 22, 2018. Answers (1)
- Identify the motor being used in the ceiling fan and explain the method of its control(Solved)
Identify the motor being used in the ceiling fan and explain the method of its control
Date posted: February 22, 2018. Answers (1)
- What is inductive interference? How is it caused and what steps are necessary to
reduce its effect?(Solved)
What is inductive interference? How is it caused and what steps are necessary to
reduce its effect?en
Date posted: February 22, 2018. Answers (1)
- Explain the working of a welding machine.(Solved)
Explain the working of a welding machine.
Date posted: February 22, 2018. Answers (1)
- How is the speed of a DC shunt motor controlled?(Solved)
How is the speed of a DC shunt motor controlled?
Date posted: February 20, 2018. Answers (1)
- Where are synchronous motors used?(Solved)
Where are synchronous motors used?
Date posted: February 20, 2018. Answers (1)
- What are the essential differences between H.V. and L.V. switchgears?(Solved)
What are the essential differences between H.V. and L.V. switchgears?
Date posted: February 20, 2018. Answers (1)
- Why are different levels of voltages used for generation, transmission and
distribution of electric power?(Solved)
Why are different levels of voltages used for generation, transmission and
distribution of electric power?
Date posted: February 20, 2018. Answers (1)
- What do you mean by transmission line efficiency and regulation? Can it be
negative also?(Solved)
What do you mean by transmission line efficiency and regulation? Can it be
negative also?
Date posted: February 20, 2018. Answers (1)