Abstract: A ceiling fan motor contains: a stator, at least one hook, and multiple coil winding sets, and an enameled wire connected with two coil winding sets and hooked by the at least one hook. The at least one hook is formed as a respective connection member of multiple connection members, and the multiple connection members are fixed in the stator.

Abstract: A boot structure of a silicon steel sheet contains: a peripheral extension and multiple boot portions. The multiple boot portions are connected with the peripheral extension and surround an inner wall of the peripheral extension. A first concaved face is formed on a first portion of the boot portion, a second concaved face is formed on a second portion of the boot portion, and an intersection point is formed on a connection portion of the first concaved face and the second concaved face.

Abstract: The present invention relates to a waveguide coupling device with properties of forward coupling and backward coupling as well as a manufacturing method thereof, the waveguide coupling device comprises: a substrate, at least one inverted taper coupling structure, an intermediate layer, and at least one three-dimensional taper coupling structure. Wherein one end of the three-dimensional taper coupling structure is adopted for connecting to an external optical fiber, so as to couple the optical wave propagating in the optical fiber; Moreover, by way of the specific coupling sequence of (three-dimensional taper coupling structure)-(intermediate layer)-(inverted taper coupling structure), the optical wave may be efficiently coupled into, be confined in, and ultimately propagates in the inverted taper coupling structure connecting to waveguide devices.