Abstract: The vehicle electric rotating machine includes a pulley unit having an opening portion formed in an axial front end thereof, and configured to perform at least one of transmission and reception of a rotation drive force to and from the rotation shaft of the rotor, and a lid attached to the opening portion to close an internal space of the pulley unit. The rotor includes a rotor side receiving surface in contact with one axial end surface of an inner ring of the bearing rotatably supporting the rotor. The pulley unit includes a pulley side receiving surface in contact with the other axial end surface of the inner ring. An air passage enabling air communication between the internal space of the pulley unit closed by the lid and ambient space is formed in at least one of the rotor side receiving surface, the pulley side receiving surface, and the lid.

Abstract: A magnet covering member made of a soft steel plate covers an outer surface of a magnetized permanent magnet placed in a rotor core of a rotor. The magnet covering member is detached from the permanent magnet when the rotor is incorporated into a stator of an alternator during an alternator assembling process. Because of a soft magnetic characteristic of the magnet covering member, an outer magnetic field generated by the permanent magnet placed between adjacent claw poles of the rotor core makes a magnetic short-circuit, and a magnetic attracting phenomenon caused by such a magnetic field is thereby reduced. The soft magnetic characteristic of the magnet covering member also serves to support the rotor.

Abstract: A stator for a rotating electric machine includes a cylindrical stator core and a stator winding. The stator winding includes inserted portions, which are inserted in slots of the stator core, and connecting portions that are located outside of the slots to connect the inserted portions. Each of the inserted portions has a rectangular cross section with a pair of long sides and a pair of short sides. In each of the slots, each of those inserted portions which are located on the radially inner side has the short sides of its cross section arranged perpendicular to the radial direction of the stator core; each of those inserted portions which are located on the radially outer side has the long sides of its cross section arranged perpendicular to the radial direction. The circumferential width of each of the slots increases in the radially outward direction of the stator core.

Abstract: An AC generator for vehicles as an electric rotary machine, a pulley is fixed to a rotating shaft, and a belt transmits a driving force from outside to the rotating shaft via the pulley.

Abstract: A vehicle alternator and a stator for the vehicle alternator are disclosed wherein a stator winding includes a plurality of base segments wound on slots of the stator, each of the base segments including a large segment and a small segment disposed in the same slots distanced from each other by one-pole pitch. The large and small segments have turning portions extending from one axial end of the stator to form coil ends, respectively, with the turning portions of the large and small segments being dislocated from each other in a circumferential direction of the stator core to provide a circumferential space to create a cooling wind flow path to pass cooling wind in a radial direction of the stator core.

Abstract: An automotive alternator has a stator winding that is made up of a plurality of U-shaped conductor segments wound through slots in a stator core. Each of the U-shaped conductor segments is connected at one end thereof to an other end of one of the U-shaped conductor segments through a joint. Some of the joints are each elongated from tips of connected two of the conductor segments in an axial direction of the stator core to have a longitudinal sectional area much greater than a transverse sectional area of the conductor segments and function as radiator fins to dissipate heat from the stator winding.

Abstract: The stator of the vehicle-mounted alternator includes a stator core formed with a plurality of slots located along a circumferential direction thereof, and first and second multi-phase windings wound in the slots, the first and second multi-phase windings being spaced from each other by a predetermined electrical angle. An output of the first multi-phase winding is rectified by a first rectifier device, and an output of the second multi-phase winding is rectified by a second rectifier device. The second rectifier device is constituted by a plurality of switching devices. The vehicle-mounted alternator includes a control device to perform on/off control on the switching devices such that a phase angle difference between an output of the first rectifier device and an output of the second rectifier device is varied depending on a rotation speed of the stator.

Abstract: The stator of the vehicle-mounted alternator includes a stator core formed with a plurality of slots located along a circumferential direction thereof, and first and second multi-phase windings wound in the slots, the first and second multi-phase windings being spaced from each other by a predetermined electrical angle. An output of the first multi-phase winding is rectified by a first rectifier device, and an output of the second multi-phase winding is rectified by a second rectifier device. The second rectifier device is constituted by a plurality of switching devices. The vehicle-mounted alternator includes a control device to perform on/off control on the switching devices such that a phase angle difference between an output of the first rectifier device and an output of the second rectifier device is varied depending on a rotation speed of the stator.

Abstract: A Lundell type rotor core with a pair of side cores and a magnetic-pole cylindrical portion has a structure in which the magnetic-pole cylindrical portion is mated between both the side cores (also referred to as “pole cores”) in a radial direction at an outside of a field coil wound on a boss portion in the side cores. The magnetic-pole cylindrical portion is made of plural magnetic steel sheets laminated in the axis direction, and is easily deformed rather than both the side cores. The easy deformation characteristic of the magnetic-pole cylindrical portion prevents generation of a gap during the assembling process of the magnetic-pole cylindrical portion and the side cores. Without paying strict dimension control of the components for the rotor core, it is easily possible to prevent any generation of a gap between the side cores and the magnetic-pole cylindrical portion while assembling. It is thereby possible to prevent a deterioration of a magnetic flux flowing in the rotor core.

Abstract: A magnet covering member made of a soft steel plate covers an outer surface of a magnetized permanent magnet placed in a rotor core of a rotor. The magnet covering member is detached from the permanent magnet when the rotor is incorporated into a stator of an alternator during an alternator assembling process. Because of a soft magnetic characteristic of the magnet covering member, an outer magnetic field generated by the permanent magnet placed between adjacent claw poles of the rotor core makes a magnetic short-circuit, and a magnetic attracting phenomenon caused by such a magnetic field is thereby reduced. The soft magnetic characteristic of the magnet covering member also serves to support the rotor.

Abstract: A vehicle alternator and a stator for the vehicle alternator are disclosed wherein a stator winding includes a plurality of base segments wound on slots of the stator, each of the base segments including a large segment and a small segment disposed in the same slots distanced from each other by one-pole pitch. The large and small segments have turning portions extending from one axial end of the stator to form coil ends, respectively, with the turning portions of the large and small segments being dislocated from each other in a circumferential direction of the stator core to provide a circumferential space to create a cooling wind flow path to pass cooling wind in a radial direction of the stator core.

Abstract: A vehicle-mounted electrical generating system has a first voltage system which operates from a high supply voltage and a second voltage system which operates from a low supply voltage that is substantially constant, and an electrical generator for supplying power to operate the first voltage system at a voltage determined by the level of field current of the generator, with the field current being derived from the low supply voltage of the second voltage system. The specifications of the field winding of the electrical generator can thereby be optimally established irrespective of the value of the high supply voltage.

Abstract: A magnet covering member made of a soft steel plate covers an outer surface of a magnetized permanent magnet placed in a rotor core of a rotor. The magnet covering member is detached from the permanent magnet when the rotor is incorporated into a stator of an alternator during an alternator assembling process. Because of a soft magnetic characteristic of the magnet covering member, an outer magnetic field generated by the permanent magnet placed between adjacent claw poles of the rotor core makes a magnetic short-circuit, and a magnetic attracting phenomenon caused by such a magnetic field is thereby reduced. The soft magnetic characteristic of the magnet covering member also serves to support the rotor.

Abstract: A Lundell type rotor core with a pair of side cores and a magnetic-pole cylindrical portion has a structure in which the magnetic-pole cylindrical portion is mated between both the side cores (also referred to as “pole cores”) in a radial direction at an outside of a field coil wound on a boss portion in the side cores. The magnetic-pole cylindrical portion is made of plural magnetic steel sheets laminated in the axis direction, and is easily deformed rather than both the side cores. The easy deformation characteristic of the magnetic-pole cylindrical portion prevents generation of a gap during the assembling process of the magnetic-pole cylindrical portion and the side cores. Without paying strict dimension control of the components for the rotor core, it is easily possible to prevent any generation of a gap between the side cores and the magnetic-pole cylindrical portion while assembling. It is thereby possible to prevent a deterioration of a magnetic flux flowing in the rotor core.

Abstract: A stator of a rotary electric machine is composed of a cylindrical stator core and stator windings inserted into slots of the stator core. A laminated body is formed by laminating steel sheets having slots and teeth. After stator windings in a flat shape are inserted into slots of the laminated body, the laminated body is bent into a cylindrical form along rollers between which the laminated body is sandwiched. In the bending process, positions of the teeth are restrained to prevent the stator windings disposed in the slots from being damaged by movement of the teeth. Alternatively, a bump extending from each tooth is formed, so that the tooth is restrained by gripping the bump in the bending process. The bumps are removed after completion of the bending process.

Abstract: A method for manufacturing rotary electric machine that has a stator winding to provide a stator winding that has a plurality of conductors wound one over another. The conductors are wound with left and right ends. Therefore, the stator winding on the stator core has an overlapped joined portion.

Abstract: An automotive alternator is provided which is designed to have enhanced cooling ability to cool a stator winding. The stator winding is made up of a plurality of U-shaped conductor segments wound through slots in a stator core. Each of the conductor segments is connected at one of ends thereof to the other end of one of the conductor segments through a joint. Some of the joints are each elongated from tips of connected two of the conductor segments in an axial direction of the stator core to have a longitudinal sectional area much greater than a transverse sectional area of the conductor segments and function as radiator fins to dissipate heat from the stator winding.

Abstract: A generator includes a case for accommodating a stator, a rotor and a fan. The case includes two end walls in an axial direction and a peripheral side wall. The case has plural axial opening portions which are provided in at least one of the two end walls and open approximately in the axial direction, and plural radial opening portions provided in the peripheral side wall. The fan is disposed at least at one axial end of the rotor to draw outside air through the axial opening portions and to discharge the drawn outside air through the radial opening portions. A cover member of the generator covers the axial opening portions from an outside of the case with clearances between the axial opening portions and the case. Accordingly, noise generated inside the case can be reflected by the cover member, and it can effectively reduce noise transmitted to an outside.

Abstract: A vehicle-mounted electrical generating system has a first voltage system which operates from a high supply voltage and a second voltage system which operates from a low supply voltage that is substantially constant, and an electrical generator for supplying power to operate the first voltage system at a voltage determined by the level of field current of the generator, with the field current being derived from the low supply voltage of the second voltage system. The specifications of the field winding of the electrical generator can thereby be optimally established irrespective of the value of the high supply voltage.

Abstract: A generator includes a case for accommodating a stator, a rotor and a fan. The case includes two end walls in an axial direction and a peripheral side wall. The case has plural axial opening portions which are provided in at least one of the two end walls and open approximately in the axial direction, and plural radial opening portions provided in the peripheral side wall. The fan is disposed at least at one axial end of the rotor to draw outside air through the axial opening portions and to discharge the drawn outside air through the radial opening portions. A cover member of the generator covers the axial opening portions from an outside of the case with clearances between the axial opening portions and the case. Accordingly, noise generated inside the case can be reflected by the cover member, and it can effectively reduce noise transmitted to an outside.