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  • Observant resolvers
    the actual and measured positions. This phase lag causes instability in the control loop, reducing performance. One efficient solution to this problem is the use of mathematical constructions called observers. Observers are a well-known way to reduce phase lag caused by sensors. They have several
  • Handling low-frequency resonance
    , typically between 500 and 1,200 Hz. Low-frequency resonance causes oscillations at the first phase crossover, typically 200 to 400 Hz. It is well known that servo performance is enhanced when controllaw gains are high. However, instability results when a high-gain control law is applied

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