Abstract:
A brush holder in a tandem vehicle alternator for a vehicle is composed mainly of a primary brush holder and a secondary brush holder accommodating plural brushes, respectively. The primary and secondary brush holders are independently formed. During a step of producing a brush assembly and of mounting the brush assembly on the tandem vehicle alternator, both of the primary and secondary brush holders are integrated into a single brush holder and tightly fastened by welding using a connection metal member.
Abstract:
According to the invention, a tandem alternator includes a rotary shaft, a first and a second field arranged in tandem on the rotary shaft, and a first and a second armature arranged in tandem in the axial direction of the rotary shaft. The first armature is provided on an outer periphery of the first field to constitute a first power generation unit. The second armature is provided on an outer periphery of the second field to constitute a second power generation unit. The first and second fields are arranged to abut each other in the axial direction of the rotary shaft, so as to minimize the axial length of the alternator. The first and second fields are configured to respectively create a first and a second magnetomotive force whose directions are opposite to each other, so as to minimize magnetic leakage between the first and second power generation units.
Abstract:
A vehicular electric rotary machine of a heat pipe cooling type is disclosed including heat pipe means 14, 14A, 15, 15B, associated with a cooling fin 51, 52 and a rear end wall 122 of a rear frame 12, which have regions exposed to an exhaust passage 19 to be cooled by a cooling wind Wa for thereby radiating heat of a rectifier.
Abstract:
According to the invention, a tandem alternator includes a rotary shaft, a first and a second power generation unit arranged in tandem in the axial direction of the rotary shaft, a housing accommodating the power generation units and having a plurality of air holes formed through a front end wall thereof, a pulley provided on a front end portion of the rotary shaft which protrudes outside from the first end wall of the housing, and a first and a second rectifier working to respectively rectify AC powers output from the first and second power generation units. The first rectifier is so fixed to the outer surface of the front end wall of the housing as to be located on the radially outside of the pulley and cover only part of the air holes. The second rectifier is fixed to the outer surface of a rear end wall of the housing.
Abstract:
In a reluctance rotary electric machine, a movable part is arranged opposing part of an alignment of a plurality of stator poles to be movable in a predetermined direction. In the movable part, at least one pair of salient poles is configured to magnetically couple to the excited at least one first pair of the plurality of poles so as to form a first magnetic flux in loop thereamong. A segment magnetic-path portion is arranged to be magnetically separated from the at least one pair of salient poles. The segment magnetic-path portion works to magnetically couple therethrough between the at least one second pair of the plurality of stator poles so as to form a second magnetic flux in loop thereamong. The first magnetic flux and second magnetic flux create a reluctance force to move the movable part in the predetermined direction.
Abstract:
A rotor for a tandem type alternator and a tandem type alternator having such a rotor are disclosed. The rotor comprises front and rear Lundell-type rotor cores, carried on a rotary shaft adjacent to each other, which include front and rear rotor coils, respectively, and front and rear claw-shaped pole portions surrounding the front and rear rotor coils, respectively. The rear Lundell-type rotor core has a rear end face including a convexed portion, formed around the rotary shaft, in which a large diameter stepped portion of the rotary shaft and a plurality of relay terminals associated therewith are accommodated in an area close proximity to the rear Lundell-type rotor core, enabling an axial length of the rotary shaft between front and rear bearings to be shortened to increase the number of allowable maximum revolutions of the rotor by that extent.
Abstract:
In a Lundell type rotor core of a rotor in a vehicular AC generator, each interposing magnet is supported at a base part of each claw-shaped magnetic pole part in an axial direction of the rotor. This configuration prevents the transmission of deformation at a front end part of each claw-shaped magnetic pole part to the interposing magnet during rotation of the rotor at high rotation speed.
Abstract:
A vehicle alternator is disclosed including a metallic frame supporting a stator having an armature winding and a rotor having a field winding. A rectifying unit is fixedly mounted on the frame for rectifying an alternating current voltage induced in the armature winding upon rotation of the rotor and comprises a stack of a positive-electrode radiating fin, carrying thereon a positive-electrode rectifier element, and a negative-electrode radiating fin, carrying thereon a negative-electrode rectifier element, between which a heat conducting sheet having insulation property is intervened. The frame carries thereon an insulating cover for covering the rectifying unit. The cover includes an encompassing section that collectively encompasses the positive-electrode rectifier element and an associated neighborhood to prevent the cooling wind drawn to an inside of the cover due to rotation of the cooling fan from directly impinging upon the positive-electrode rectifier element.
Abstract:
According to the invention, a tandem alternator includes a rotary shaft, a first and a second field arranged in tandem on the rotary shaft, and a first and a second armature arranged in tandem in the axial direction of the rotary shaft. The first armature is provided on an outer periphery of the first field to constitute a first power generation unit. The second armature is provided on an outer periphery of the second field to constitute a second power generation unit. The first and second fields are arranged to abut each other in the axial direction of the rotary shaft, so as to minimize the axial length of the alternator. The first and second fields are configured to respectively create a first and a second magnetomotive force whose directions are opposite to each other, so as to minimize magnetic leakage between the first and second power generation units.
Abstract:
A brushless rotary electric machine includes a stator having an annular armature core with first radial teeth at the outer periphery thereof and second radial teeth at the inner periphery thereof and an armature winding wound between the teeth, a rotor having a pair of first and second rotary cores disposed tandem in the axial direction thereof, and a field coil. Each of the first and second rotary cores has a pair of coaxial outer and inner cylindrical pole members respectively facing the first and second radial teeth, a center core and a disk member magnetically connecting the pair of coaxial cylindrical pole members and the center core. The stator is accommodated by a first space defined by the outer and inner cylindrical members of the pair of first and second rotary cores. The field coil is accommodated by a second space defined by the inner cylindrical pole member and the center core of the first and second rotary cores.