Vehicle AC generator
AssigneeDenso Corporation
InventorsShin Kusase, Tsutomu Shiga
Life of this patent
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Abstract
A rotor of a vehicle AC generator is comprised of a rotor core and a field coil. The rotor core is comprised of a boss portion and a plurality of claw-pole portions bending to respectively extend in axial directions from outer circumferences of the boss portion to interleave with each other to form a zigzag space between the claw-pole portions. The field coil comprises a main coil portion disposed on the boss portion, a sub-coil portion disposed between the main coil and the claw-pole portions and a flywheel diode connected in parallel with the main coil. When the field current is cut off, current circulating through the main coil is increased because the energy accumulated in the sub-coil is discharged.
Claims11
A vehicle AC generator including a stator, a rotor having a rotor core and a field coil wound around said rotor core, a flywheel element and a field current control unit for controlling field current supplied to said field coil, wherein
- said rotor core comprises a cylindrical boss portion, a pair of disk portions extending radially outward from opposite axial ends of said boss portion, and a plurality of trapezoidal claw-pole portions bending to respectively extend in axial directions from outer circumferences of said pair of disk portions to alternately interleave with each other to form a zigzag space between said claw-pole portions,
- aid field coil comprises a main coil portion disposed on said boss portion and a sub-coil portion series-connected to said main coil and disposed between said main coil and said claw-pole portions, and
- said flywheel element is connected in parallel with one of said main coil and said sub-coil.
A vehicle AC generator driven by an engine, said vehicle AC generator including a stator, a rotor having a rotor core and a field coil disposed in said rotor core, a flywheel element and a field current control unit having a switch element for controlling field current supplied to said field coil, wherein
- said rotor core comprises a boss portion and a plurality of magnetic poles,
- said field coil comprises a main coil portion wound around said boss portion and a sub-coil portion series-connected to said main coil and wound around said magnetic poles, and
- said flywheel element is connected in parallel with one of said main coil and said sub-coil.
Dependencies are inferred from the claim text.