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A voltage regulator of a vehicle AC generator includes a rotor having a plurality of magnetic poles, a field coil for polarizing magnetic poles, an armature having an armature core with a plurality of phase windings for generating AC voltage under the influence of rotating magnetic field provided by

A voltage regulator of a vehicle AC generator includes a rotor having a plurality of magnetic poles, a field coil for polarizing magnetic poles, an armature having an armature core with a plurality of phase windings for generating AC voltage under the influence of rotating magnetic field provided by the rotor and a full-wave rectifier for converting the AC voltage into DC voltage. The voltage regulator is comprised of a circuit for detecting phase voltage of one of the phase windings, and a comparator for comparing the phase voltage with a variable threshold level formed from the phase voltage and providing an output signal. Even if the phase voltage is biased by a DC bias voltage due to leak in the armature, the rotation of the rotor can be detected.

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A voltage regulator of a vehicle AC generator includes a rotor having a plurality of magnetic poles, a field coil for polarizing magnetic poles, an armature having an armature core with a plurality of phase windings for generating AC voltage under the influence of rotating magnetic field provided by

A voltage regulator of a vehicle AC generator includes a rotor having a plurality of magnetic poles, a field coil for polarizing magnetic poles, an armature having an armature core with a plurality of phase windings for generating AC voltage under the influence of rotating magnetic field provided by the rotor and a full-wave rectifier for converting the AC voltage into DC voltage. The voltage regulator is comprised of a circuit for detecting phase voltage of one of the phase windings, and a comparator for comparing the phase voltage with a variable threshold level formed from the phase voltage and providing an output signal. Even if the phase voltage is biased by a DC bias voltage due to leak in the armature, the rotation of the rotor can be detected. nt integrating means for integrating current values that are detected by said current sensor during a period from the instant the battery is fully charged to the instant it is fully charged later; a dividing means for dividing the integrated value of detected current values calculated by said detected current integrating means by the length of the period; and a correcting means for correcting a detected current using the quotient provided by said dividing means as an offset. 2. A battery capacity measuring device according to claim 1, further comprising a fully charging means that, when a predetermined time has elapsed since the instant the battery is fully charged previously, controls said generator so as to fully charge the battery. 3. A remaining capacity calculating system for vehicle batteries, comprising: a voltage detecting means for detecting the voltage at the terminals of a battery that is mounted in a vehicle having an electrical rotating machine connected to an engine and that is charged by the electrical rotating machine; a current detecting means for detecting a current that flows through the battery; an index calculating means for calculating an index of polarization in the battery according to the detected current; a control means for controlling the electrical rotating machine so that the index of polarization will remain within a predetermined range which permits limitation of the effect of polarization on the charged state of the battery; and a calculating means for when the index of polarization remains within the predetermined range, calculating the remaining capacity of the battery according to the detected terminal voltage of the open-circuit voltage of the battery. 4. An automatic engine stopping/starting system for vehicles comprising the remaining capacity calculating system for vehicle batteries set forth in claim 3, and an inhibiting means (230) for, when the remaining capacity of the battery falls below a permissible value, inhibiting automatic stopping of an engine. 5. An electrical rotating machine control system for vehicles comprising the remaining capacity calculating system for vehicle batteries set forth in claim 3, and a control means for, when the remaining capacity is equal to or larger than a permissible value, controlling a motor-generator, which serves as the electrical rotating machine, so that the motor-generator will assist the engine. 6. An electrical rotating machine control system for vehicles comprising: a voltage detecting means for detecting the voltage at the terminals of a battery that is mounted in a vehicle having an electrical rotating machine connected to an engine and that is charged by the electrical rotating machine; a current detecting means for detecting a current that flows through the battery; an index calculating means for calculating an index of polarization in the battery according to the detected current; and a control means for controlling the electrical rotating machine so that the index of polarization will remain within a predetermined range which permits limitation of the effect of polarization on the charged state of the battery. 7. A fully-charged state judging system for vehicle batteries, comprising: a voltage detecting means for detecting the voltage at the terminals of a battery that is mounted in a vehicle having an alternator and a regulator for regulating the output voltage of said alternator, and that is charged with the output voltage of said alternator regulated by said regulator; a current detecting means for detecting a current that flows through the battery; a fully-charged state judging means for, when the detected terminal voltage of the battery and the detected current belong to a predetermined fully-charged state judgment range, judging that the battery is fully charged; and an index calculating means for calculating an index of polarization in the battery according to the detected current, wherein said fully-