摘要:
An automotive alternator includes a rotary shaft, a pulley, a stator, a rotor, and a magnetic fluctuation suppressor. The pulley is provided on the rotary shaft to transmit rotating power from an engine to the rotary shaft. The stator includes a stator winding. The rotor is mounted on the rotary shaft and configured to provide a first rotating magnetic field to the stator. The magnetic fluctuation suppressor includes a magnetic body and a magnetic source. The magnetic body is mounted on the rotary shaft such that the magnetic body is rotatable along with the rotary shaft at a rotational speed different from that of the rotary shaft. The magnetic source is fixed to the rotary shaft so as to create a second rotating magnetic field which induces a magnetic attraction between the magnetic body and the magnetic source, by which fluctuations in rotational movement of the rotary shaft are suppressed.
摘要:
A method of calculating torque of a Lundell-type synchronous generator is disclosed in which only power generation output current and a rotational speed are input for calculation of the amount of electric power and the amount of losses for thereby enabling calculation of power generating torque, based on a sum of the amount of electric power and the amount of losses, which is generated as an output. The present method establishes formulae enabling calculation based on only output current and the rotational speed, enabling a minimal number of inputs to shorten a calculation time interval.
摘要:
A vehicle alternator for generating electric power is driven by an engine mounted on a vehicle driven through a driving belt. The alternator has a pulley part joined to and directly receiving a driving force from the engine through the driving belt, a field magnet part located in separation from the pulley part, a rotation speed changing part placed between the pulley part and the field magnet part. The rotation speed changing part converts the number of revolutions between the pulley part and the field magnet part. The rotation speed changing part decreases a speed changing ratio “S” according to increasing of the number of revolutions of the engine, where the speed changing ratio “S” is obtained by dividing the number of revolutions of the field magnet part by the number of revolutions of the pulley part.
摘要:
A rotor and a stator are contained in a housing composed of front and rear frames, and a rectifier is mounted on the rear frame and covered with a rear cover having axial and radial openings. A minus heatsink plate having cooling fins extending in the axial direction is disposed to face the radial openings, forming radial air passages, and another air passage is formed between the minus heatsink plate and the rear frame. Cooling air introduced from the radial openings flows through the cooling fins and through the passage between the minus heatsink plate and the rear frame. Thus, efficiency for cooling the rectifier is enhanced.
摘要:
An alternator for a vehicle has a rotor with a field wiring, a stator with a three-phase stator wiring, a regulator, and a rectifier. The regulator and rectifier are disposed away from each other with the rotor between. An alternating current is generated in the stator wiring in response to a rotation of the rotor and a field current received in the field wiring. The rectifier converts the alternating current into a direct current and outputs the direct current as an electrical energy generated in the alternator. The regulator regulates a value of the filed current to control the electrical energy. The rectifier acts as a heat generating member, but heat generated in the rectifier is hardly transmitted to the regulator disposed away from the rectifier.
摘要:
A rolling bearing assembly according to the present invention includes an inner ring, an outer ring, a plurality of rolling elements interposed between the inner and outer rings, and a magnet provided to cause magnetic attraction between the rolling elements and at least one of the inner and outer rings. With the magnetic attraction, it is possible to avoid any collision between the rolling elements and the inner and outer rings, thereby preventing brittle flaking from occurring in the rolling bearing assembly.
摘要:
In a vehicle ac generator, a regulator that controls output voltage is mounted to a connector case. The connector case is constructed of a common connector and an individual connector. The common connector includes internal terminals that connect the regulator with internal circuits of such as a rectifying device and a rotor. The individual connector includes external terminals that receive and transmit electric information from and to external circuits. The common connector and the individual connector have intermediate terminals that contact with each other. Further, the common connector and the individual connector have engaging portion to engage with each other. The common connector can be shared with individual connectors having different shapes.
摘要:
According to the present invention, a rolling bearing for supporting a rotary shaft of an automotive accessory includes an inner ring, an outer ring, a plurality of rolling elements interposed between the inner and outer rings, and grease. The grease has a withstand pressure greater than a predetermined range in which plastic deformation of at least one of surfaces of the inner and outer rings and rolling elements occurs in absence of an elastohydrodynamic lubrication film of the grease on the surface. With such a configuration, it is possible to reliably avoid plastic deformation of the inner and outer rings and rolling elements regardless of presence of elastohydrodynamic lubrication films between the inner and outer rings and the rolling elements. As a result, brittle flaking is reliably prevented from occurring in the rolling bearing.
摘要:
A rotor and a stator are contained in a housing composed of front and rear frames, and a rectifier is mounted on the rear frame and covered with a rear cover having axial and radial openings. A minus heatsink plate having cooling fins extending in the axial direction is disposed to face the radial openings, forming radial air passages, and another air passage is formed between the minus heatsink plate and the rear frame. Cooling air introduced from the radial openings flows through the cooling fins and through the passage between the minus heatsink plate and the rear frame. Thus, efficiency for cooling the rectifier is enhanced.
摘要:
There is provided a method and apparatus for designing a rolling bearing provided with components including rolling elements, an outer ring, and an inner ring which come into contact with each other. First, it is determined whether or not adiabatic shear bands have a potential for occurrence within at least one of the components, due to the fact that stress is applied to the components, thus causing high deformation rates in the at least one of the components to cause an unstable plastic phenomenon that brings about an adiabatic shear deformation state within the at least one of the components. Then an estimation is made such that brittle flaking resulting from the adiabatic shear bands have a potential for occurrence within the at least one of the components, when it is determined that the adiabatic shear bands have a potential for occurrence.