Abstract:
A ratio (L2/L1) between an axial length L1 of disk portions and a length L2 of a stator core over lapping the disk portions in a radial direction is 0.3 or more, and a ratio (R2/R1) between an outside radius R1 of claw-shaped magnetic poles and an outside radius R2 of a cylindrical portion is within a range of 0.50 to 0.54.
Abstract:
An alternator includes a stator having a stator core formed with a number of slots extending longitudinally on an inner circumference thereof, and two sets of three-phase stator coils installed in the slots, and a rotor rotably disposed inside the stator, the rotor having a field coil for generating magnetic flux on passage of electric current, and pole cores covering the field coil, a number of claw-shaped magnetic poles being formed in the pole cores by the magnetic flux, a total number of slots in the alternator being one per pole per phase per set, the slots being formed such that radial center lines of adjacent openings of the slots have nonuniform pitch in a circumferential direction.
Abstract:
A vehicular AC generator has a stator including a stator coil formed by AC connection of four-turn phase coils by serially inserting coil conductors into slots separated by intervals of three slots, the coil conductors being arranged four in a line in a radial direction, and wherein each of the phase coils is obtained by performing the steps of: inserting the U-shaped coil pieces from the axial side into two adjacent sets of two of the separated slots so that one of the coil pieces is respectively positioned at the first outermost place in one slot of each of the two sets and the fourth outermost place in the other slot of each of the two sets, and that another of the coil pieces is respectively positioned at the second outermost place in one slot of each of the two sets and the third outermost place in the other slot of each of the two sets; inserting remaining U-shaped coil pieces from the axial side into remaining sets of two of the separated slots so that one of the remaining coil pieces is respectively positioned at the first outermost place in one slot of each of the remaining sets and the second outermost place in the other slot of each of the remaining sets, and that another of the remaining coil pieces is respectively positioned at the third outermost place in one slot of each of the remaining sets and the fourth outermost place in the other slot of each of the remaining sets; forming first and second coils by connecting an end portion of each coil piece, which extends from the first outermost place in one slot of each of sets of two of the separated slots, to an end portion of each coil piece, which extends from the second outermost place in the other slot of each of the sets, and by connecting an end portion of each coil piece, which extends from the third outermost place in one slot of each of the sets, to an end portion of each coil piece, which extends from the fourth outermost place in the other slot of each of the sets, and forming a crossover connection portion between the first and second coils by cutting off the coil pieces inserted into the first outermost place in one slot of each of the two sets and the fourth outermost place in the other slot, and by connecting cut end portions of the coil pieces extending from the first outermost places in each slot of the two sets to the axial opposite side, cut end portions of the coil pieces extending from the fourth outermost places in each slot of the two sets to the axial opposite side being used a lead wire and a wire connected to a neutral point, respectively.
Abstract:
A thin metal sheet is laminated to form in advance a plurality of core units (of a circular cylinder shape) having the thickness of 1/N (N is a natural number of more than 2) of a predetermined thickness in the laminating direction and this plurality of core units is laminated again for securing so that the whole stator does not cause any mode of oscillation in the diametric direction.
Abstract:
A rotor structure comprising a rotor coil for generating a magnetic flux, a pole core which covers the rotor coil and consists of a first pole core body and a second pole core body, each having a plurality of claw-like magnetic poles which are mated with each other, magnets provided on both sides of each of the claw-like magnetic pole for suppressing the leakage of a magnetic flux between adjacent claw-like magnetic poles, and reinforcements for holding the magnets in such a manner that the magnets are inclined so that the interval between the magnets becomes larger on the outer side than on the inner side. This rotor structure can reduce centrifugal force applied to the magnets.
Abstract:
A pair of pole cores comprises shoulder portions positioned on both axial ends of the diametrically outermost portions of the claw-shaped magnetic poles formed into beveled or curved outer circumferential surfaces, and diametrically outermost leading-edge face portions positioned on the leading edges in the direction of rotation at both axial ends of the diametrically outermost portions of the claw-shaped magnetic poles each being formed into an outer circumferential surface inclined in a circumferential direction by a surface which passes through a point A where the inner circumferential edge of the diametrically outermost leading-edge face positioned on the leading edge in the direction of rotation of the diametrically outermost portion of each of the claw-shaped magnetic poles intersects a plane which passes through an axial end of the stator core and perpendicularly intersects the axis of the shaft, and a point B located on a ridge line where the diametrically outermost leading-edge face intersects the beveled or curved outer circumferential surface formed on the shoulder portion.
Abstract:
An automotive alternator comprises a voltage regulator case molded from insulating resin in which a connector portion, a circuit housing portion for housing a circuit portion of a voltage regulator and a condenser housing portion are integrally formed, in which conductors are insert-molded to form connecting terminals for electric connection to the outside and internal wiring paths, and on which a heat sink for cooling the circuit portion of the voltage regulator is disposed so as to cover an opening of the circuit housing portion, the voltage regulator case being disposed on same plane as a rectifier which intersects the axial center of the shaft at a right angle so as to surround the shaft at one end of the shaft, wherein the connector portion, the circuit housing portion and the condenser housing portion of the voltage regulator case are arranged circumferentially such that the axial direction of the connector portion, the longitudinal direction of cooling fins of the heat sink and the longitudinal direction of the condenser housing portion each point towards the axial center of the shaft.
Abstract:
A rotor for an automotive alternator comprises a cylindrical bobbin fitted over the base portions of a pair of field cores having a cylindrical portion, a pair of first and second annular flange portions projecting perpendicularly from both ends of the cylindrical portion, a recessed groove disposed at an angle to the radial direction in the inner wall of the first flange portion, and an anchor portion disposed on an outer circumferential portion of the first flange portion in close proximity to the outer circumferential end of the recessed groove; and a field winding having a circular cross-section, the starting portion of which is wound around the anchor portion and housed in the recessed groove, then drawn from the inner circumferential end of the recessed groove onto the outer circumferential surface of the cylindrical portion of the bobbin, and additionally wound a predetermined number of turns into multiple layers on the cylindrical portion of the bobbin, at least one portion of the field winding excluding the prewind portion and the postwind portion being formed with a rectangular cross-section.
Abstract:
A vehicle alternator is constructed such that satisfies the relationship0.3.ltoreq.{Br.multidot.(t1+t2).multidot.L}/(W.multidot.t1.multidot.cos.theta.).ltoreq.2.0where Br represents the residual magnetic flux density of each of the magnets, L represents the length from the short side at the tip to the long side at the base of each of the claw-shaped magnetic poles, W represents the width in the circumferential direction at the base, 2.theta. represents the angle formed by an oblique side which joins one end of the tip to one end of the base and another oblique side which joins the other end of the tip to the other end of the base, t1 represents the thickness of each of the claw-shaped magnetic poles at the base, and t2 represents the thickness of each of the claw-shaped magnetic poles at the tip.