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Detector for shorted rotating diode of a brushless alternator

  • US 4,528,493 A
  • Filed: 11/25/1983
  • Issued: 07/09/1985
  • Est. Priority Date: 11/25/1983
  • Status: Expired due to Term
First Claim
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1. In a brushless alternator having an exciter field circuit including a source of DC potential with a reference, a stationary exciter field winding and a voltage regulator transistor connected in series with the field winding across the DC source, a rotor with an exciter armature, a diode rectifier connected with said armature and a main field winding connected with the diode rectifier, a stator winding in which the alternator output voltage is developed coupled with the main field winding, and a voltage regulator responsive to the alternator output providing a base drive signal to the voltage regulator transistor, an improved detector for a shorted diode rectifier, comprising:

  • means for comparing the voltage at the base of the voltage regulator transistor and the voltage at the terminal of said stator field winding connected with said voltage regulator transistor; and

    means responsive to the comparing means for indicating the occurrence of a shorted diode rectifier on said rotor.

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