Sundstrand Corporation

Sunstrand Corporation

Frank W Allen, Iii

Michael R Hernden

W Kyle Anderson

Mohammad Shahamat

Curtis B White

Mohammed F Shahamat

The present invention is an improved filter assembly for providing at least common-mode filtering. A filter assembly in accordance with the present invention includes a plurality of spaced apart electrical conductors (102) for carrying at least common-mode electrical current; a housing (104) electrically isolated from the plurality of electrical conductors and containing a portion of a length of the plurality of electrical conductors, the housing having an interior cavity (104) defined by a wall (112) having at least a partially electrically conductive section (114), the wall extending outward from two longitudinally spaced apart locations on the plurality of electrical conductors and between the plurality of electrical conductors at a position spaced from the plurality of electrical conductors to form the cavity; at least one inductive element (108) in a closed lower reluctance loop extending around the plurality of electrical conductors and electrically isolated therefrom and the electrically conductive portion of the wall to provide an inductance common to the plurality of electrical conductors; and at least one capacitive element (110), each capacitive element having an electrical contact with the electrically conductive portion of the wall and the plurality of electrical conductors to provide capacitance between the plurality of electrical conductors and the electrically conductive portion of the wall.

Common-mode EMI filter

The problem of assembling and maintaining good electrical contact in a rotating rectifier assembly (40) is solved using brazed connections. The rectifier assembly (40) includes a cylindrical housing (44) receiving a pair of coaxial copper plates (50,52) which act as outputs. Each copper plate (50,52) has three angularly spaced, square-shaped diode wafers (64,70) brazed thereto on one face. The opposite face of each diode wafer (64,70) is brazed to a conductive strap (68,74). The straps (68,74) extend radially outwardly. The two plates (50,52) are angularly aligned so that their respective diode wafers (64,70) are in angular alignment, with the straps (68,74) for the aligned diode wafers (64,70) of each plate (50,52) being soldered together to provide a phase connection. A conductive strap (58,60) is brazed to each of the two plates (50,52) for connection to conductive posts (48) which connect to the main field (32).

Rotating rectifier assembly

An electric generator and a method of securing a connection between flexible electrical leads from a rectifier and a main field winding in a rotor of the generator wherein the leads are arranged so that they extend through a generally axially extending hole in the rotor with their free ends being connected in a parallel splice configuration which extends radially outward from the hole with the connected free ends being secured with respect to the rotor so as to remain in the radially outward extending position during rotation of the rotor. The rectifier is located at one end of the magnetic core and field winding of the main generator with the rectifier leads extending through a hole in the magnetic core and a field winding insulator to the opposite end of the magnetic core and field winding for connection with the field winding leads. Rotational forces will not pull the lead wire connections apart and the connections are readily accessible for repair.

Growing community of inventors

Rockford, IL, United States of America

Frank W Allen, Iii