Abstract: A rotor of a rotary electric machine has a pair of pole core members each of which has a core portion and a plurality of claw poles extending axially from outer periphery of the core portion. A plurality of magnet holders with permanent magnets are held therein and a connection member axially fixes the magnet holders to the pole core members. The connection member has a pair of end plates disposed at opposite ends of the rotor and a plurality of connecting rods extending axially to mechanically connect the magnet holders from opposite ends.

Abstract: An alternator includes a housing having first and second axial end portions with a plurality of air intake ports for permitting air to pass through the axial end portions. The housing also includes first and second air exhaust ports which are spaced from one another. A stator assembly includes a stator core provided on an inner surface of the housing between the air exhaust ports and a stator winding wound around the stator core. A rotor assembly includes a rotor shaft, a rotor core fixed to the rotor shaft, and a rotor coil wound around the rotor core. The rotor shaft is rotatably supported by the axial end portions of the housing. A diode fin and a voltage regulator are disposed around an end of the rotor shaft. A pair of fans are mounted to the end surfaces of the pole cores of the rotor to increase the cooling efficiency of the alternator.

Abstract: An alternate current generator having a housing consisting of directly coupled frame pieces and a stator core fixed directly to the inside surface of one of said frame pieces and a pair of fans fixed to the side surfaces of the pole cores of the rotor, mainly in order to increase the structural strength and the cooling efficiency of the generator. The housing is dimensioned such that stator windings receive a maximum of cooling air.

Abstract: An improved construction of Randel-type rotor of a vehicle-mounted alternator, capable of reducing the windage noise which is produced as a result of interference between the rotor and the stator of the alternator. The rotor has a pair of pole cores provided with a plurality of mutually meshing claws, and an exciting coil disposed at the inner side of the pole cores. Spacers in the form of an integral ring or discrete wedges are fitted in the spaces between adjacent pole core claws so as to provide a substantially smooth cylindrical outer peripheral surface of the rotor portion facing the radial teeth on the stator.

Abstract: An alternator assembly for an automotive vehicle including a rectifier device composed of a plurality of diodes supported on a negative-side cooling fin of semi-circular arc shape, a plurality of diodes supported on a positive-side cooling fin of semi-circular arc shape, and a terminal board supporting a plurality of terminals connected to the diodes. The rectifier device is assembled and held in a unitary structure by a plurality of metal members, and arranged in a space defined by an end frame and a rear cover of the alternator assembly in such a manner that the metal members are in contact at one end thereof with the rear cover and at the other end thereof with the end frame.

Abstract: A brush holding device for holding carbon brushes in sliding contact with slip rings of an alternator. The device has a brush holder formed by an insertion molding integrally with terminal plates. The brush holder has a pair of brush chambers for movably receiving the carbon brushes and a pair of pig tail chambers accommodating pig tails through which the carbon brushes are electrically connected to the terminal plates. The carbon brushes are resiliently biased into contact with the slip rings by means of coiled springs acting between the radially outer ends of the carbon brushes and the radially outer walls of the brush receiving chambers. The pig tails are extended into adjacent brush chambers through slits formed in the walls separating the pig tail chambers from associated brush chambers and are connected to the carbon brushes at lateral sides of the latter.

Abstract: A power generation control system for a vehicle generator comprises a generator including an armature coil, an exciting coil and a rectifier for rectifying the AC output of the armature coil, a battery, and a voltage control device for controlling the activation of the generator in accordance with the terminal voltage of the battery. This power generation control system further comprises an abnormal voltage detector circuit for detecting the voltage generated across the armature coil and cutting off the current flowing in the exciting coil when said voltage exceeds a predetermined value. The abnormal voltage detector circuit has the function to hold this forcible stoppage of power generation.

Abstract: A generation control apparatus for vehicle generator normally controls the energization of the vehicle generator in response to a terminal voltage of a battery which is charged by the generator through a rectifier. The generation control apparatus includes a fault detection circuit to detect an abnormal condition of the terminal voltage of the battery or the output voltage of the generator, and if the abnormal condition is detected, a changeover circuit effects the control of the energization in accordance with the output voltage of the generator instead of the battery terminal voltage.

Abstract: A semi-conductor voltage regulation system for a vehicle alternator has a timed signal generating circuit initiated by the engine starter signal. The field exciting current of the alternator is first supplied for a predetermined period after the engine has been started until the alternator is excited to start generation. When the alternator is fully excited, the regulation system operates in the well known manner.

Abstract: In a voltage control apparatus for an electric generator (1) for vehicles including an armature winding (3), an exciting coil (4), a rectifier (2) for rectifying an a.c. output from the armature winding, and a voltage regulator (5), the voltage regulator comprises a differential amplifier circuit (26) producing a detected voltage corresponding to a difference between a battery charging voltage and a reference voltage, a comparator circuit (30) comparing the detected voltage with a triangular waveform voltage generated at constant periods and producing a pulsed output voltage, a first driver circuit (51) effecting duty-factor-control of an exciting current flowing through the exciting coil in response to the pulsed output voltage, and an initial excitation circuit (32) for causing a predetermined small initial exciting current to flow through the exciting coil intermittently during a time interval after the start of the electric generator.

Abstract: A semi-conductor voltage regulation system for a vehicle includes engine rise-up detection circuit and an oscillator circuit. The field exciting current is intermittently supplied by the oscillator circuit before the engine starts and continuously supplied after the engine has started so as to minimize battery discharge.

Abstract: A generator operation indicating apparatus for vehicle generators having a protective circuit against abnormal voltage, includes a drive circuit for turning an indicating device on from the time of closing of a key switch until the time that a vehicle generator attains a predetermined operating condition to indicate the generator operation and a control circuit for forcibly rendering the drive circuit inoperative in response to the occurrence of an abnormal voltage between the indicating device and the drive circuit. When the generator attains the predetermined operating condition, the indicating device is turned off and the supply of current to a load circuit is started. In this case, the drive circuit is also forced to come out of operation upon occurrance of an abnormal supply voltage.

Abstract: When an engine key switch of a vehicle is closed, a rotor coil of a three-phase a.c. alternator adapted to charge a vehicle-mounted battery is excited by a first controlling circuit. Even with the closure of the engine key switch, the exciting current is restricted to a predetermined value by a second controlling circuit before the alternator has reached a predetermined operating state. The operating state of the alternator is monitored by detecting a voltage at the neutral point of a stator coil connected in star of the alternator.

Abstract: A semi-conductor voltage regulation system for a vehicle includes engine rise-up detection circuit and an oscillator circuit. The field exciting current is intermittently supplied by the oscillator circuit before the engine starts and continuously supplied after the engine has started so as to minimize battery discharge. The engine rise-up detection circuit changes its input impedance in accordance with the voltage applied thereto, whereby a highly reliable regulator with less heat generation may be obtained.

Abstract: A rotor of an alternating current generator has a field excitation assembly supported on a rotor shaft including a pair of rotor segments forming a cavity therein, a bobbin made of an insulating resin disposed in the cavity and a field excitation coil wound on the bobbin. The bobbin has a cylindrical portion and a pair of flanged portions at both ends thereof for forming room for the field excitation coil. On one of the flanged portion, a pair of projections are integrally formed therewith extending axially and outwardly, which are press-fitted into a pair of through holes formed on one of the rotor segments. Each of the projections is formed with not only an axially extending groove for receiving a field coil terminal, but a radially and axially extending slit communicating the outside of the projection with the groove for guiding and receiving a coil starting or terminating end of the field coil.

Abstract: An improved construction of a .?.Randel.!. .Iadd.Lundell.Iaddend.-type rotor of a vehicle-mounted alternator, capable of reducing the windage noise which is produced as a result of interference between the rotor and the stator of the alternator. The rotor has a pair of pole cores provided with a plurality of mutually meshing claws, and an exciting coil disposed at the inner side of the pole cores. Spacers in the form of an integral ring or discrete wedges are fitted in the spaces between adjacent pole core claws so as to provide a substantially smooth cylindrical outer peripheral surface of the rotor portion facing the radial teeth on the stator.