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  • ELECTRONICS AND ELECTRICAL ENGINEERING  (2)
  • 1980-1984  (2)
  • 1975-1979
  • 1950-1954
  • 1983  (2)
  • 1
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    Adaptive control system for line-commutated inverters (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A control system for a permanent magnet motor driven by a multiphase line commutated inverter is provided with integration for integrating the back EMF of each phase of the motor. This is used in generating system control signals for an inverter gate logic using a sync and firing angle (alpha) control generator connected to the outputs of the integrators. A precision full wave rectifier provides a speed control feedback signal to a phase delay rectifier via a gain and loop compensation circuit and to the integrators for adaptive control of the attenuation of low frequencies by the integrators as a function of motor speed. As the motor speed increases, the attenuation of low frequency components by the integrators is increased to offset the gain of the integrators to spurious low frequencies.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Impedance properties of circular microstrip antenna (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A moment method solution to the input impedance of a circular microstrip antenna excited by either a microstrip feed or a coaxial probe is presented. Using the exact dyadic Green's function and the Fourier transform the problem is formulated in terms of Richmond's reaction integral equation from which the unknown patch current can be solved for. The patch current is expanded in terms of regular surface patch modes and an attachment mode (for probe excited case) which insures continuity of the current at probe/patch junction, proper polarization and p-dependance of patch current in the vicinity of the probe. The input impedance of a circular microstrip antenna is computed and compared with earlier results. Effect of attachment mode on the input impedance is also discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: International Radar Symposium; Oct 09, 1983 - Oct 12, 1983; Bangalore; India
    Format: text
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    NASA TECHNICAL REPORTS
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