Switched Reluctance Motor (SRM) Basics Quiz

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Questions and Answers

What is the mode in which the rotor rotates in a (CCW) direction?

  • Demagnetization mode
  • Build up mode (correct)
  • Excitation mode
  • Free wheeling mode

Which equation represents the voltage of the excited phase?

  • $V = Ri + L + i$
  • $V = Ri + L + e$
  • $V = Ri + \lambda\frac{di}{dt}$
  • $V = Ri + L\frac{di}{dt}$ (correct)

What characteristic makes the torque constant of SRM non-constant?

  • Variation with stator current
  • Variation with power input
  • Variation with rotor position (correct)
  • Variation with motor speed

What does the term $rac{dL}{d\theta}$ represent in the torque equation?

<p>Torque constant and back emf constant (A)</p> Signup and view all the answers

Why does an SRM not have a steady state equivalent circuit like a DC motor?

<p>Because rotor position and motor current are not related (A)</p> Signup and view all the answers

What does the term $\frac{dL}{d\theta}$ represent in the torque equation?

<p>Change in inductance with respect to rotor position (C)</p> Signup and view all the answers

In which mode does the rotor rotate when phase D is excited?

<p>Build up mode (D)</p> Signup and view all the answers

What is the characteristic that makes the torque constant of SRM non-constant?

<p>Variation of torque with respect to rotor position (D)</p> Signup and view all the answers

What is represented by the equation $\theta_5 = \theta_4 + \theta_1$?

<p>Rotor position in build up mode (C)</p> Signup and view all the answers

Why does an SRM not have a steady state equivalent circuit like a DC motor?

<p>Due to the variation of torque with respect to rotor position (B)</p> Signup and view all the answers

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Study Notes

Switched Reluctance Motor (SRM) Overview

  • SRM features stator windings powered by DC voltage, with no windings or magnets on the rotor.
  • Rotor must be salient, exhibiting a different number of poles (Pr) compared to the stator poles (Ps).
  • Combinations of poles may include configurations such as 12/10, 12/8, 8/6, and 6/4.
  • The ratio of stator poles (Ps) to rotor poles (Pr) must be a non-integer, e.g., 10/8, 8/6, or 6/4.

Operational Theory

  • In the magnetic circuit, the rotor rotates towards the minimum reluctance position when excited.
  • When two rotor poles align with two stator poles, the other rotor poles are misaligned with the remaining stator poles.
  • The excitation of the aligned stator poles prompts rotation of the rotor to a new alignment position.
  • Stator windings are energized from a DC supply based on the rotor's position, reflecting the variation of reluctance.
  • The machine's operation is centered around the principle of switched reluctance.

Direction of Rotation

  • The rotor's direction of rotation is opposite to the sequence of the stator excitation.
  • For instance, if phase B is energized, the rotor rotates in a clockwise (CW) direction.

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