Abstract: An outer rotor motor has a bearing housing with reduced machining and material costs, can be assembled with high accuracy, and has favorable durability. A bearing is attached to an inner circumferential surface of a housing main body that has been formed in a cylindrical shape by plastic deformation caused by press molding a metal matrix. At least one protruding surface is formed by plastic deformation so as to protrude further outward than the housing main body, and the stator core is attached to the outer circumference-side of the at least one protruding surface.

Abstract: A brushless motor includes a rotor; a motor shaft supporting the rotor; a bearing section radially supporting the motor shaft; a thrust receiving section receiving an end of the motor shaft in the thrust direction; and an elastic damper ring being fitted on the motor shaft, the elastic damper ring being located between a circular groove, which is formed in the vicinity of the end of the motor shaft received by the thrust receiving section, and an end face of the bearing section.

Abstract: An outer rotor motor has a bearing housing with reduced machining and material costs, can be assembled with high accuracy, and has favorable durability. A bearing is attached to an inner circumferential surface of a housing main body that has been formed in a cylindrical shape by plastic deformation caused by press molding a metal matrix. At least one protruding surface is formed by plastic deformation so as to protrude further outward than the housing main body, and the stator core is attached to the outer circumference-side of the at least one protruding surface.

Abstract: In a wavelength-division multiplexed communication system utilizing optical solitons in which optical amplifiers are inserted into an optical fiber at predetermined intervals so as to compensate for loss in the fiber, the group-velocity dispersion of the optical fiber is varied at positions where the optical amplifiers are provided as well as in regions between the optical amplifiers, so as to eliminate dispersive waves generated by the solitons, thereby eliminating disturbance due to soliton collision. This prevents time shifts due to soliton collision in different wavelength channels in a wave-length multiplex system.

Abstract: In soliton optical fiber communication systems that comprise a multiplicity of spaced-apart intermediate non-electronic amplifiers, pulse arrival time jitter can be substantially reduced by incorporation into the transmission path of spaced-apart bandwidth-limiting elements. Exemplarily, the bandwidth-limiting elements are optical filters of bandwidth B.sub.f, with a filter associated with each intermediate amplifier, and with B.sub.f chosen to fall within the range B.sub.sol (N.sub.f /3).sup.1/2, where B.sub.sol is the FWHM spectral width of the soliton pulses, and N.sub.f is the number of intermediate filters in the system. More generally, the bandwidth-limiting elements are selected such that >.delta.t.sup.2 >, the variance of the jitter, is at most 90% of the variance associated with an, otherwise identical, comparison system that does not contain the bandwidth-limiting elements. Systems according to the invention thus can overcome the Gordon-Haus limit on the bit rate/distance product.

Abstract: Pulses of electromagnetic energy of appropriate peak power can form soliton pulses in monomode fiber. The width of such pulses changes during propagation, and can decrease for certain ranges of peak power, e.g., between about P.sub.o and 9/4 P.sub.o, where P.sub.o is the "balanced" peak power. Using this property, repeaterless transmission of soliton pulses is possible if the pulses are non-electronically amplified by appropriate amounts at appropriate intervals. Exemplary amplifying means are glass laser, Raman laser, semiconductor laser medium, and cw injection.