초록 ▼

A hybrid alternator includes a stator and a rotor, with the rotor having longitudinally separate wound field and permanent magnet rotor portions. A rotor excitation circuit applies a forward polarity to the wound field rotor portion to increase output in a boosting mode at low RPMs and a reverse pol

A hybrid alternator includes a stator and a rotor, with the rotor having longitudinally separate wound field and permanent magnet rotor portions. A rotor excitation circuit applies a forward polarity to the wound field rotor portion to increase output in a boosting mode at low RPMs and a reverse polarity to decrease output at high RPMs in a bucking mode to maintain a constant voltage output. Alternative embodiments combine a magnetic flux concentrating design for efficient low speed operation with integral strength for high speed capability. Dual voltage output is provided either through dual stator windings or through a voltage converter circuit. Single voltage output is provided using only one stator winding. A three state voltage regulator allows voltage regulation without inducing reverse currents onto the power bus in the lightly loaded or no battery conditions.

대표청구항 ▼

[ Thus, having described the invention, what is claimed is:] [1.] An alternator comprising:a rotor mounted for rotation on a shaft; anda stator surrounding the rotor and separated therefrom by an air gap, the stator having a first longitudinal region formed of magnetic material and a second longitud

[ Thus, having described the invention, what is claimed is:] [1.] An alternator comprising:a rotor mounted for rotation on a shaft; anda stator surrounding the rotor and separated therefrom by an air gap, the stator having a first longitudinal region formed of magnetic material and a second longitudinal region formed of magnetic material, the second longitudinal region being magnetically separated from the first longitudinal region by a stator gap having one or more cooling air passages, the cooling air passages allowing radial air flow of ambient cooling air from a point directly outside the alternator to a point within the stator gap between the first and second longitudinal regions of the stator and then into the air gap between the stator and the rotor;the rotor including:a wound field rotor portion mounted on the shaft for rotation within the first longitudinal region of the stator, the wound field rotor portion having a rotor winding, anda permanent magnet rotor portion mounted on the shaft in longitudinally spaced relation to the wound field rotor portion for rotation within the second longitudinal region of the stator the permanent magnet rotor portion having a plurality of magnetic poles.