| US 7,555,893 B2 | ||
| Aircraft propulsion system | ||
| Keiichi Okai, Tokyo (Japan); Takeshi Tagashira, Tokyo (Japan); Ryoji Yanagi, Tokyo (Japan); and Hiroshi Nomura, Tokyo (Japan) | ||
| Assigned to Japan Aerospace Exploration Agency, Tokyo (Japan); and Nihon University, Tokyo (Japan) | ||
| Filed on Jan. 23, 2006, as Appl. No. 11/336,828. | ||
| Claims priority of application No. 2005-016538 (JP), filed on Jan. 25, 2005. | ||
| Prior Publication US 2006/0254255 A1, Nov. 16, 2006 | ||
| Int. Cl. F02K 1/00 (2006.01) | ||
| U.S. Cl. 60—228 [60/224; 60/226.1; 310/184; 310/185; 310/187; 310/198; 310/203; 310/206; 244/1 R; 244/53 R; 244/60] | 9 Claims |
| 1. An aircraft propulsion system, comprising:
a first propulsion unit which generates thrust; and
a second propulsion unit which has thrust vectoring means for varying a vector of the thrust,
wherein the second propulsion unit is an electromagnetic driving fan in which Mi row, where i=1, 2, . . ., n, as split armature coils, that is a figure-of-eight coil which crosses and forms symmetry at a
central portion, are disposed on an outer circumference of the fan, and a coil Ai row and a coil Bi row, where i=1, 2, . . ., n, as split excitation coils, that form a rectangle, are disposed on an inner peripheral surface
of a casing portion of the fan so that when one of the split excitation coils referred to as the coil Ai in coil row of split excitation coils, overlaps the central portion of one of the split armature coils, two other split excitation
coils adjacent to the coil Ai referred to as the coil Bi-1 and Bi in coil row of split excitation coils, overlaps with either of the end portion of the split armature coils respectively, and
wherein each of the split excitation coils comprises:
a condenser which constitutes an LC circuit,
a switching device which conduct current to each of the split excitation coils in two directions,
a switching circuit which switches the bias direction of the condenser in accordance with the polarity of the condenser, and
a power source which supplies an electrical charge to the condenser,
wherein in the timing when one of the split excitation coils overlaps with the central portion of one of the split armature
coils, conducting alternating currents whose sizes are equal and whose directions are opposite with each other, to two other
split excitation coils overlapping with either of the end portion of the split armature coils which supply the split armature
coils with an effective induced current contributing to the rotation of the fan, and at the same time conducting alternating
current to the split excitation coils overlapping with the central portion of the split armature coils which supply the split
armature coils with an effective magnetic field intersecting with the central portion of the split armature coils contributing
to the rotation of the fan, and an effective electromagnetic force is generated by the interaction between the effective induced
current and the effective magnetic field, and the fan is rotated by summation of all the effective electromagnetic forces
over all the split armature coils.
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