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Questions and Answers
What is the mode in which the rotor rotates in a (CCW) direction?
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?
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?
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?
What does the term $rac{dL}{d\theta}$ represent in the torque equation?
Why does an SRM not have a steady state equivalent circuit like a DC motor?
Why does an SRM not have a steady state equivalent circuit like a DC motor?
What does the term $\frac{dL}{d\theta}$ represent in the torque equation?
What does the term $\frac{dL}{d\theta}$ represent in the torque equation?
In which mode does the rotor rotate when phase D is excited?
In which mode does the rotor rotate when phase D is excited?
What is the characteristic that makes the torque constant of SRM non-constant?
What is the characteristic that makes the torque constant of SRM non-constant?
What is represented by the equation $\theta_5 = \theta_4 + \theta_1$?
What is represented by the equation $\theta_5 = \theta_4 + \theta_1$?
Why does an SRM not have a steady state equivalent circuit like a DC motor?
Why does an SRM not have a steady state equivalent circuit like a DC motor?
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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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