Sundstrand Corporation

Derek N Walton

Mahesh J Shah

Clarence F Dolan

Richard J Hoppe

A brushless electrical power generating system (10) in accordance with the invention includes a main generator (16) having a rotor (30) on which is wound a field winding (32) and a stator (112) on which is wound a winding (36) for producing an alternating current electrical output having at least one phase; an exciter (14) having a rotor (24) mounted coaxial to the rotor of the main generator and a stator (110) on which is wound a stator winding (18) and an electrical field shield (40) disposed between the stators of the exciter and the main generator for shielding the winding of the stator of the main generator from an electric field produced by the winding of the stator of the exciter whereby capacitive coupling of any electrical noise present within the current flowing in the stator winding of the exciter to the alternating current electrical power output is reduced.

Electrical power generating system having reduced conducted emissions in

A brushless generator in accordance with the present invention includes a main generator having a stator (12) on which is wound at least one phase winding (52-56), each phase winding producing a phase output (.PHI.A-.PHI.C); a number of current transformers (20-24) equal in number to a number of phases present in the main generator, each current transformer being magnetically coupled to a conductor (48) of a different phase winding; and a plurality of annular disks (40), equal in number of the number of phases, each annular disk having an annulus (46) containing the conductor of the phase winding of a different phase, slot (42) extending from an inner radius (44) defining the annulus to an outer radius (50) defining an outer cirucmference of the disk, each annular disk being held by a support (10) for the current transformer, having a permeability greater than 1020-type steel and attenuating harmonics of a fundamental frequency of AC produced by the main generator.

Brushless electrical power generator with reduced harmonics

A power supply in accordance with the present invention includes a chassis (26) associated with the power supply; a voltage source (12) providing an output voltage varying at a fundamental frequency and having a noise component changing as a function of time at a frequency above the fundamental frequency; a filter (41) including an inductance (44) in series with the voltage source for attenuating the noise component and outputting the fundamental frequency; and a cooling apparatus (42) thermally and capacitively coupled to the inductor for conducting heat from the inductor and shunting the noise component to the chassis.

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Roscoe, IL, United States of America

Derek N Walton