Pulsed excitation alternator
OwnerJacques H. Jarret, Jean M. B. Jarretinventors
Life of this patent
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Abstract
Alternator having a pulsed excitation. Means are provided to supply short current pulses into the pick-up coils at a suitable time so to magnetize the circuit. As a consequence the shape of the magnetic circuit can be simplified and the weight of iron and copper can be reduced.
Claims11
In an alternator having at least one coil surrounded by an iron magnetic circuit for picking up electrical power from the alternator and having two ends, the coil cooperating with a magnetic moving part of iron cyclically displaced between two positions to form a gap having a size dependent on instant position of the moving part, the improvement comprising:
- a substantially constant voltage power supply source having a positive and a negative terminal;
- two controlled valves, said two ends of said at least one coil being respectively connected to said positive terminal and to said negative terminal of said substantially constant voltage power supply source through respective ones of said controlled valves;
- and
- monodirectional current connections between each of said two ends of said at least one coil and opposite terminal of the power supply source.
In an alternator having at least one coil surrounded by a magnetic circuit for picking up electrical power from the alternator and having two ends, the coil cooperating with a magnetic moving part cyclically displaced between two positions to form a gap having a size dependent on instant position of the moving part, the improvement comprising:
- a substantially constant voltage power supply source having a positive and a negative terminal;
- two controlled valves, said two ends of said at least one coil being respectively connected to said positive terminal and to said negative terminal of said substantially constant voltage power supply source through respective ones of said controlled valves;
- and
- monodirectional current connections between each of said two ends of said at least one coil and opposite terminal of the power supply source;
- including means for supplying excitation pulses to the coil during from about 1% to about 10% of the total cycle of said moving part, said means being coupled to control electrodes of said valves to control conduction thereof with said pulses.
Dependencies are inferred from the claim text.