Abstract: A ceiling fan motor includes a shaft, a stator, an upper motor cover, a bearing unit, a lower motor cover, a rotor magnet, and a circuit board arranged below the stator. The upper motor cover is a ferromagnetic body. The circuit board includes a board body, a rotation sensor attached to the board body and opposed to the rotor magnet in an up-down direction, and a circuit component larger in mass than the rotation sensor. If there is defined an imaginary line which is orthogonal, when seen in the up-down direction, to a line interconnecting the rotation sensor and the center axis and which passes through the shaft, a gravity center of the circuit board is positioned in one of two areas of the circuit board divided by the imaginary line, which differs from the other area where the rotation sensor exists.

Abstract: A bladder-type jig used for manufacturing a stiffened panel structure using a hat stringer has the advantage that deformation of prepreg can be suppressed effectively, and durability of the jig can be improved so that repeated use of the jig is achieved. A body of the bladder includes a pipe-shaped portion and a coating film covering the outer peripheral surface of the pipe-shaped portion. The pipe-shaped portion is a main body portion of the body, and is made of a silicone rubber composition material such that its transverse cross-section has a trapezoidal pipe shape. Both side edge portions of an exposed wall portion corresponding to a lower base of the transverse cross-section are thickened edge portions which are greater in thickness than another wall portions. The thickened edge portions support the exposed wall portion from inward of the body, and can suppress the exposed wall portion from getting deformed inwardly.

Abstract: A bladder-type jig used for manufacturing a stiffened panel structure using a hat stringer has the advantage that deformation of prepreg can be suppressed effectively, and durability of the jig can be improved so that repeated use of the jig is achieved. A body of the bladder includes a pipe-shaped portion and a coating film covering the outer peripheral surface of the pipe-shaped portion. The pipe-shaped portion is a main body portion of the body, and is made of a silicone rubber composition material such that its transverse cross-section has a trapezoidal pipe shape. Both side edge portions of an exposed wall portion corresponding to a lower base of the transverse cross-section are thickened edge portions which are greater in thickness than another wall portions. The thickened edge portions support the exposed wall portion from inward of the body, and can suppress the exposed wall portion from getting deformed inwardly.