Hybrid alternator
First Claim
1. A hybrid alternator comprising:
- a stator having a stator winding;
a rotor mounted for rotation within the stator and separated therefrom by a radial air gap, the rotor including;
a shaft mounted for rotation within the stator,a wound field rotor portion mounted on the shaft for rotation within a first longitudinal region of the stator, the wound field rotor portion having a plurality of laminations arranged perpendicular to the shaft, a rotor winding and multiple electromagnetic poles defined by a plurality of radially oriented projections from each of said laminations, one for each of said electromagnetic poles, the laminations being stacked together to form a salient pole rotor core and the rotor winding being wound around the radial projections of the rotor core to form a plurality of coils around the rotor core, adjacent ones of said coils being wound in opposite directions to produce alternating north and south magnetic fields in adjacent ones of said electromagnetic poles when current is passed through the rotor winding, anda permanent magnet rotor portion mounted on the shaft in longitudinally spaced relation to the wound field rotor portion for rotation within a second longitudinal region of the stator, the permanent magnet rotor portion having multiple permanent magnetic poles defined by one or more permanent magnets, the number of permanent magnetic poles corresponding in number to the number of said electromagnetic poles in the wound field rotor portion.
2 Assignments
0 Petitions
Accused Products
Abstract
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.
121 Citations
27 Claims
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1. A hybrid alternator comprising:
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a stator having a stator winding; a rotor mounted for rotation within the stator and separated therefrom by a radial air gap, the rotor including; a shaft mounted for rotation within the stator, a wound field rotor portion mounted on the shaft for rotation within a first longitudinal region of the stator, the wound field rotor portion having a plurality of laminations arranged perpendicular to the shaft, a rotor winding and multiple electromagnetic poles defined by a plurality of radially oriented projections from each of said laminations, one for each of said electromagnetic poles, the laminations being stacked together to form a salient pole rotor core and the rotor winding being wound around the radial projections of the rotor core to form a plurality of coils around the rotor core, adjacent ones of said coils being wound in opposite directions to produce alternating north and south magnetic fields in adjacent ones of said electromagnetic poles when current is passed through the rotor winding, and a permanent magnet rotor portion mounted on the shaft in longitudinally spaced relation to the wound field rotor portion for rotation within a second longitudinal region of the stator, the permanent magnet rotor portion having multiple permanent magnetic poles defined by one or more permanent magnets, the number of permanent magnetic poles corresponding in number to the number of said electromagnetic poles in the wound field rotor portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification