Battery charger/pre-exciter for engine-driven generator
First Claim
1. An engine-driven generator comprising:
- an engine;
a starter motor coupled to said engine;
a battery for supplying current to said starter motor to start said engine;
an alternator coupled to said engine, said alternator having a main exciter field winding;
a permanent magnet battery charger/pre-exciter coupled to said engine, said permanent magnet battery charger/pre-exciter having a pre-exciter winding and a battery charge winding;
a voltage regulator coupled to said pre-exciter and to said main exciter field winding for maintaining a desired main winding voltage substantially independently of the load current supplied by said engine-driven generator; and
an additional voltage regulator coupled to said battery charge winding and said battery for maintaining a desired voltage across said battery substantially independently of the load current supplied by said engine-driven generator.
3 Assignments
0 Petitions
Accused Products
Abstract
An engine-driven generator having a battery powered starter motor includes a permanent magnet battery charger/pre-exciter for charging the starting battery and for exciting the main alternator field winding of an AC synchronous alternator included in the engine-driven generator. A first winding in the permanent magnet battery charger/pre-exciter provides power to a first voltage regulator that, in turn, maintains a desired load voltage substantially independently of alternator loading. A second winding within the permanent magnet battery charger/pre-exciter supplies power to a second voltage regulator that maintains a desired battery charging voltage substantially independently of the alternator loading. Use of the permanent magnet battery charger/pre-exciter maintains a desired battery charge current and a desired main alternator field excitation substantially independently of the load current supplied by the alternator.
49 Citations
14 Claims
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1. An engine-driven generator comprising:
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an engine; a starter motor coupled to said engine; a battery for supplying current to said starter motor to start said engine; an alternator coupled to said engine, said alternator having a main exciter field winding; a permanent magnet battery charger/pre-exciter coupled to said engine, said permanent magnet battery charger/pre-exciter having a pre-exciter winding and a battery charge winding; a voltage regulator coupled to said pre-exciter and to said main exciter field winding for maintaining a desired main winding voltage substantially independently of the load current supplied by said engine-driven generator; and an additional voltage regulator coupled to said battery charge winding and said battery for maintaining a desired voltage across said battery substantially independently of the load current supplied by said engine-driven generator. - View Dependent Claims (2, 3, 4, 5)
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6. A battery charger/pre-exciter for an engine-driven generator of the type having a starting battery, an alternator and an alternator main exciter field winding in the alternator, said battery charger/pre-exciter being operable to charge the starting battery and to excite the alternator main exciter field winding in the engine-driven generator, said battery charger/pre-exciter comprising:
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a permanent magnet; means for rotating said permanent magnet to provide a changing magnetic field; a first winding within said changing magnetic field; a first voltage regulator coupled to said first winding and operable to develop a desired voltage for application to the alternator main exciter field winding in response to the voltage induced in said first winding by said changing magnetic field; a second winding within said changing magnetic field; and a second voltage regulator coupled to said second winding and operable to develop a desired voltage for application to the starting battery of the engine-driven generator in response to the voltage induced in said second winding by said changing magnetic field. - View Dependent Claims (7, 8, 9)
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10. An alternator comprising:
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an input shaft; a main alternator field winding co-rotatable with said input shaft; a main alternator output winding in magnetic communication with said main alternator field winding; a main exciter field winding; a main exciter armature winding co-rotatable with said input shaft in magnetic communication with said main exciter field winding and electrically coupled to said main alternator field winding; a plurality of permanent magnets co-rotatable with said input shaft for developing a changing magnetic field in response to rotation of said input shaft; a pre-exciter winding in magnetic communication with said permanent magnets; means for coupling electrical energy developed in said pre-exciter winding to said main exciter field winding; a battery charge winding; said main alternator output winding, said main exciter field winding, said pre-exciter winding and said battery charge winding each being stationary relative to said input shaft; and voltage regulator means coupled to said battery charge winding for converting electrical energy induced in said battery charge winding to a direct current suitable for charging a battery. - View Dependent Claims (11, 12, 13, 14)
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Specification