2751 4.3 Relative Displacement:Translational and Rotational V.Synchros同步机and Resolvers V3 High-speed AA- Phase- digital Error sensitive sin/cos Integrator AA amp demod multiplier Va Synchro Scott T transformer TAngle (digital) Up-down Voltage- Dynamic counter controlled compensation oscillator Digital output word for angle Fig 4.27 Synchro-to-Digital Converter 28/51 4.3 Relative Displacement:Translational and Rotational Vl.Variable-Inductance(电感)&Variable-Reluctance(磁阻)Pickups Similar to LVDT,but two inductance coils only >The reluctance of a uniform magnetic circuit can be calculated as: R=_ HourA Variable reluctance used to measure acceleration4.3 Relative Displacement: Translational and Rotational V. Synchros(同步机) and Resolvers Fig 4.27 Synchro-to-Digital Converter 27/51 4.3 Relative Displacement: Translational and Rotational VI. Variable-Inductance(电感) & Variable-Reluctance(磁阻) Pickups ‹ Similar to LVDT, but two inductance coils only ¾The reluctance of a uniform magnetic circuit can be calculated as: ‹ Variable reluctance used to measure acceleration 28/51