Abstract: In a small-sized hydroelectric power generating apparatus in which a waterwheel 3 arranged in a fluid path and rotating with passage of a prescribed flow rate of fluid, a rotating body 4 coupled with the waterwheel and rotating therewith is used as a rotor portion arranged oppositely to a stator portion 6, and the rotor portion is rotated relatively to the stator portion 6 with passage of the fluid to generate electric power, the small-sized hydroelectric generation includes a continuous internal space formed when a first case 1 and a second case 5 are fit to each other, said first case having an inlet 12 and an outlet 13 of said fluid path and said second case having the internal space which communicates with said inlet and outlet and in which said rotating body is arranged and separating the internal space from the stator portion, wherein a concave portion 14 is provided at a fitting portion between said first case and said second case; an opposite wall 5a opposite to the inner wall of said concave portion

Abstract: A small-sized hydroelectric power generating apparatus includes a body case having a fluid passage, a water wheel provided at the above fluid passage and rotating with passing of the fluid having the predetermined flowing amount, a rotator coupled to this water wheel, and rotating with the water wheel, the rotator serving as a rotor portion arranged opposed to a stator portion, the rotor portion being relatively rotated in relation to the stator portion by passing the fluid to generate electric power, the stator portion having comb-shaped pole teeth which are arranged in the circumferential direction at regular intervals so as to be opposed to the peripheral surface of a rotor magnet of the above rotor portion, and a circumferential gap between the adjacent pole teeth is set to 1.5 times or less the size of a radial gap between each pole tooth and the rotor magnet.

Abstract: A motor incorporates a rotor 21 incorporating a cylindrical magnet 24 which has segments magnetized at predetermined pitches in a circumferential direction thereof; and a stator 25 for imparting a rotating magnetic field to the magnet 24 so as to rotate the rotor 21. Each of the magnetized segments is magnetized such that the inner portion and the outer portion are magnetized to different polarities and the magnetized segments disposed at adjacent pitches are magnetized to opposite polarities. The stator 25 incorporates a first polar tooth row and a second polar tooth row each of which is constituted by polar teeth corresponding to the predetermined pitches of the magnetized segments such that the polar teeth disposed opposite to the magnetized segments across the magnet are magnetize to different polarities, and the polarities of the first polar tooth row and the second polar tooth row are switched so that a rotating magnetic field is imparted to the cylindrical magnet 24.