Polyphase alternator with single phase output

Claim 1

An electrical power generator including in combination: an armature comprising a plurality of polyphase connected electromagnetic coils; a plurality of rotatable field poles disposed in flux cutting proximity to the said armature coils and including a field winding; a prime mover operably connected to the field poles; a pair of mutually inverted polyphase gate controlled rectifiers interconnected in parallel and each respectively connected to the armature coil and each including control gate means; a source of alternating control voltage having an output connected to the control gate means; a source of excitation voltage connected to the said field winding; a full wave rectifier connected to the output of the said source of alternating control voltage; and means interconnecting the full wave rectifier and the field coil and responsive to the unfiltered output of the full wave rectifier to modulate the field winding exitation voltage.

Claim 7

A method of generating low frequency (f) alternating electrical power, including the steps of: generating high frequency alternating polyphase voltage of frequency of at least 4f, sinusoidally modulating the level of the high frequency polyphase voltage output at the said low frequency rate, rectifying the modulated high frequency polyphase voltage alternately positively and negatively at the low frequency rate wherein the positive half cycle of rectification produces full wave rectified D.C. pulses on the positive side of a zero voltage reference and the negative half cycle produces half wave rectified D.C. pulses on the negative side of the zero voltage reference, and providing a zero voltage commutation period of approximately 30* at the beginning and end of each low frequency half cycle.

Claim 8

A method of generating low frequency (f) alternating electrical power, including the steps of: generating high frequency alternating polyphase voltage of frequency of at least 4f, sinusoidally modulating the level of the high frequency polyphase voltage output at the said low frequency rate, rectifying the modulated high frequency polyphase voltage alternately positively and negatively at the low frequency rate wherein the positive half cycle of rectification produces full wave rectified D.C. pulses on the positive side of a zero voltage reference and the negative half cycle produces half wave rectified D.C. pulses on the negative side of the zero voltage reference, and providing a zero voltage commutation period of approximately 30* at the beginning and end of each low frequency half cycle.