ECE :: Automatic Control Systems
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For any transfer function, the constant phase angle loci are
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For an m x n matrix A, the eigen values are the roots of the characteristic equation
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In force current analogy, displacement x is analogous to
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Consider the following statements about variable reluctance stepper motor used in control system
- The static torque acting on rotor is a function of angular misalignment between stator and rotor teeth
- There are two positions of zero torque i.e, . Q = 0 and
where T is the number of rotor teeth - Both zero torque positions are stable
- When stator is excited, rotor is pulled into minimum reluctance position
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Consider the following statements about root locus
- The root locus is symmetrical about real axis.
- If a root locus branch moves along the real axis from an open loop pole to zero or to infinity, this root locus branch is called real root branch.
- The breakaway points of the root locus are the solutions of
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In Bode plots the frequency at which two asymptotes meet is called corner frequency.
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In the signal flow graph in the given figure the number of forward paths and pairs of non-touching loops are respectively
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Assertion (A): The phase angle plot in Bode diagram is not affected by change in system gain.
Reason (R): The variation in gain has no effect on phase margin of the system.
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