초록 ▼

A transformer (20) for coupling AC electrical energy from a stationary element (22) to a rotating element (24) without the use of sliding contacts. The transformer (20) is of the rotary type and includes a ferrite core (39) and two primary windings (70 and 72) which are stationary with respect to a

A transformer (20) for coupling AC electrical energy from a stationary element (22) to a rotating element (24) without the use of sliding contacts. The transformer (20) is of the rotary type and includes a ferrite core (39) and two primary windings (70 and 72) which are stationary with respect to a secondary winding (88) which rotates within an annular cavity (48) adjacent an axial bore (58) in the core. The core (39) is comprised of two cup type core halves (40 and 42). Electrical connection to the secondary winding (88) is made through a split bobbin assembly (89) which couples to a coaxial shaft assembly (59) located in the axial bore (58). The electrical coupling to the coaxial shaft assembly is made through a continuous transverse channel (68) connecting the axial bore (58) with the annular cavity (48). The transverse channel (68) forms a single air gap; however, it is not open directly to free space but is shielded by the magnetic permeable material of the core halves (40 and 42).

대표청구항 ▼

A rotary transformer (20), comprising: a magnetic core (39) of magnetically permeable material, having a central axial bore (58), an annular cavity (48) adjacent said axial bore (58), and a continuous transverse channel (68) forming an air gap between said axial bore (58) and said annular cavity (48

A rotary transformer (20), comprising: a magnetic core (39) of magnetically permeable material, having a central axial bore (58), an annular cavity (48) adjacent said axial bore (58), and a continuous transverse channel (68) forming an air gap between said axial bore (58) and said annular cavity (48); first electrical winding means (70, 72) wound about and in stationary contact with said magnetic core (39); an electrical winding (88) located in said annular cavity (48), wound on a split bobbin about said magnetic core (39) and rotatable relative to said magnetic core (39) and said first winding means (70, 72) while maintaining a substantially constant flux coupling with said first winding means (70, 72) during energization of said first winding means (70, 72) independently of the positional relation between said rotatable winding and said magnetic core (39); an electrically conductive coaxial shaft assembly (98 and 107) freely rotatable in said axial bore (58); and means (96 and 108) for coupling said coaxial shaft assembly (98 and 107) to opposite sides of said rotatable winding (88) through said split bobbin (89).