By C. J. Chesmond (Auth.)
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Additional info for Control System Technology
Synchro and Resolver Transmitters Where synchros, resolvers, or Inductosyns are to be used as feedback transducers, it is commonplace to use comparable synchros and resolvers as the reference transducers. In these cases, it may be advantageous to build additional friction into the reference shaft bearings, to prevent the setting from being moved by vibration. The dials normally would carry linear scales and be calibrated in terms of desired position. There are some applications in which it is preferable to synthesise electrically the pattern of AC voltages, representing reference data, presented to the feedback transducer.
The following factors are relevant to this technique: • • • • • • • no velocity transducer is required; RA will have a very low resistance value but must have a current rating to match that of the motor armature; the values of RA and RA will both be affected by self heating and it will be difficult to match them over a wide range of loading; armature reaction will tend to corrupt the linearity of the EB vs N characteristic, but to some extent this effect can be compensated for by slightly increasing the value of RA ; the use of a differential amplifier assumes that it is impractical to connect either of its two inputs to signal common, which sometimes may not be the case; R can have a relatively high value, so that the R + R limb need not draw a significant level of current from the servoamplifier; the accuracy obtainable with this technique cannot approach that provided by a good velocity transducer.
3 To sense torsional strain, for which both axial and bending strains are ignored, all four elements are made active and mounted as shown in Figure 4. FIG. 4 The pair of elements R1 and R2 will change equally (in resistance) as a result of both bending and axial strains, so that their effects on V 0 will cancel to zero. A similar situation will exist for the pair R3 and R 4 . However, torsional strain would typically cause R1 and R4 to increase equally and R2 and R3 to decrease equally, so that all four effects would be additive in influencing V 0 .
Control System Technology by C. J. Chesmond (Auth.)