Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator
Reexamination Certificate
2001-11-06
2003-09-23
Ponomarenko, Nicholas (Department: 2834)
Electricity: single generator systems
Automatic control of generator or driving means
Speed or frequency of generator
C322S028000, C322S032000, C290S04000F
Reexamination Certificate
active
06624617
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system for stabilizing the voltage of an AC generator with alternating or variable rotor speed such as generators used, for example, in motor vehicles, wind energy generators, turbo motors or emergency power generating sets.
It is known in the art to equip an AC generator inductor with a diode in the electric circuit of the self-magnetizing rotor. The disadvantage of such generators is that an unstable voltage is generated when the rotor speed changes.
Controlling the self-magnetization of the rotor via a non-contacting inductive energy transmission so as to obtain a certain, predetermined stable output voltage is also known in the art. This was previously achieved with the additional installation of a high-frequency pulse generator for stabilizing the voltage of an AC generator with variable rotor speed. The high-frequency pulse generator is used to control the rotor current via a transformer with two coils arranged on two separate magnetic cores.
Such a solution has been already described in Georgian patent GE P 2000 2161 B. The disadvantage of said invention is that high currents have to be transmitted across non-contacting conductors (i.e., across a void or air gap between magnetic cores equipped with coils or windings). The present invention eliminates said disadvantage.
BRIEF DESCRIPTION OF THE INVENTION
The problem is solved in accordance with the invention in that an electronic switch (
11
) is provided in the rotor (
2
) that implements incoming control pulses from the high-frequency pulse generator into interruptions in the self-magnetizing current. This results in the contactless transmission of low control currents only and considerably improves the control system, thereby increasing the reliability and efficiency of the AC generator overall.
REFERENCES:
patent: 3809914 (1974-05-01), Kilgore et al.
patent: 3908161 (1975-09-01), Messenger
patent: 4035712 (1977-07-01), Yarrow et al.
patent: 5023537 (1991-06-01), Baits
patent: 5418446 (1995-05-01), Hallidy
patent: 5594322 (1997-01-01), Rozman et al.
patent: 6051953 (2000-04-01), Vithayathil
patent: 6188204 (2001-02-01), Vithayathil et al.
patent: 6462429 (2002-10-01), Dhyanchand et al.
patent: P 2000 2161 (1998-11-01), None
Holzer Walter
Manukov Rudolf
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