US3899652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extended range inductor alternator arc welder
Assignee: Maremont Corp
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Filing: 1973-12-26
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Granted: 1975-08-12
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Expires: 1993-12-26
Abstract
Abstract An arc welder comprises an inductor alternator having two field windings, a rectifier for rectifying the alternator output, and an internal combustion engine, electric motor or other prime mover for driving the alternator. A variable electrical supply is provided for energizing one field winding of the alternator. By varying the excitation voltage of such one field winding, varying output currents for welding are produced, and over a given range of excitation voltages, the corresponding open circuit voltages will fall within a relatively narrow range of voltages considered ideal or most favorable for welding purposes. A switch means is provided for connecting the second field winding of the alternator in series with the welder output circuit in either a compound differential or aiding mode. This alters the output characteristics of the welder resulting in a lower or higher range of welding currents being produced for the same range of open circuit voltages, thereby extending the usefulness of the welder.
Inventors
- 👤 Stanley M Terry
- 👤 The Third National Bank Of By
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:21
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/22; H02K19/24; B; B23; B23K; B23K9/00; B23K9/10; B23K9/1006; H02K19/26; H02K19/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
222 words
An arc welder comprising an inductor alternator having a stator core with a plurality of poles, a first field winding fixed relative to said stator core and having when excited a magnetic field passing through said stator poles, a plurality of generating windings fixed relative to said stator core and received on said poles thereof, and a windingless rotor rotatable relative to said stator core to cyclically vary the reluctance of flux paths through said stator poles to vary the flux passing through said poles and to thereby induce alternating voltages in said generating windings, a variable electrical supply connected to excite said first field winding, two output terminals, means connected between said generating windings and said two output terminals to supply said two output terminals with electrical power derived from the voltages induced in said generating windings, a welding electrode, means for connecting one of said two output terminals to said electrode, means for connecting the other of said two output terminals to a workpiece, a second field winding included in said inductor alternator and fixed relative to said stator core and having when excited a magnetic field which also passes through said stator poles, and means for selectively connecting and disconnecting said second field winding to and from exciting series relationship with the output current from said two output terminals.
Claim 2
Dependent Claim
222 words
An arc welder comprising an inductor alternator having a stator core with a plurality of poles, a first field winding fixed relative to said stator core and having when excited a magnetic field passing through said stator poles, a plurality of generating windings fixed relative to said stator core and received on said poles thereof, and a windingless rotor rotatable relative to said stator core to cyclically vary the reluctance of flux paths through said stator poles to vary the flux passing through said poles and to thereby induce alternating voltages in said generating windings, a variable electrical supply connected to excite said first field winding, two output terminals, means connected between said generating windings and said two output terminals to supply said two output terminals with electrical power derived from the voltages induced in said generating windings, a welding electrode, means for connecting one of said two output terminals to said electrode, means for connecting the other of said two output terminals to a workpiece, a second field winding included in said inductor alternator and fixed relative to said stator core and having when excited a magnetic field which also passes through said stator poles, and means for selectively connecting and disconnecting said second field winding to and from exciting series relationship with the output current from said two output terminals.
Claim 3
Dependent Claim
226 words
An arc welding comprising an inductor alternator having a stator core with a plurality of poles, a first field winding fixed relative to said stator core and having when excited a magnetic field passing through said stator poles, a plurality of generating windings fixed relative to said stator core and received on said poles thereof, and a windingless rotor rotatable relative to said stator core to cyclically vary the reluctance of flux paths through said stator poles to vary the flux passing through said poles and to thereby induce alternating voltages in said generating windings, a variable direct current electrical supply connected to excite said first winding, two output terminals, a rectifier connected between said generating windings and said two output terminals to supply said output terminals with a rectified voltage derived from the alternating voltages induced in said generating windings, a welding electrode, means for connecting one of said two output terminals of said electrode, means for connecting the other of said two output terminals to a workpiece, a second field winding included in said inductor alternator and fixed relative to said stator core and having when excited a magnetic field which also passes through said stator poles, and means for selectively connecting and disconnecting said second field winding to and from exciting series relationship with the output current passing through said two output terminals.
Claim 4
Dependent Claim
226 words
An arc welding comprising an inductor alternator having a stator core with a plurality of poles, a first field winding fixed relative to said stator core and having when excited a magnetic field passing through said stator poles, a plurality of generating windings fixed relative to said stator core and received on said poles thereof, and a windingless rotor rotatable relative to said stator core to cyclically vary the reluctance of flux paths through said stator poles to vary the flux passing through said poles and to thereby induce alternating voltages in said generating windings, a variable direct current electrical supply connected to excite said first winding, two output terminals, a rectifier connected between said generating windings and said two output terminals to supply said output terminals with a rectified voltage derived from the alternating voltages induced in said generating windings, a welding electrode, means for connecting one of said two output terminals of said electrode, means for connecting the other of said two output terminals to a workpiece, a second field winding included in said inductor alternator and fixed relative to said stator core and having when excited a magnetic field which also passes through said stator poles, and means for selectively connecting and disconnecting said second field winding to and from exciting series relationship with the output current passing through said two output terminals.
Claim 5
Dependent Claim
106 words
An arc welder defined in claim 2 further characterized by said means for connecting and disconnecting said second field winding to and from exciting series relationship with the output current passing through said two output terminals comprising a switch means having one position at which said second field winding is connected in series relationship with said output current and with the connection being such that saiD output current flows through said second field winding in such a direction as to cause said magnetic field of said second field wind to oppose said magnetic field of said first field winding as excited by said variable voltage source.
Claim 6
Dependent Claim
105 words
An arc welder defined in claim 2 further characterized by said means for connecting and disconnecting said second field winding to and from series relationship with the output current passing through said two output terminals comprising a switch means having one position at which said second field winding is connected in series relationship with said output current and with the connection being such that said output current flows through said second field winding in such a direction as to cause said magnetic field of said second field winding to aid said magnetic field of said first field winding as excited by said variable voltage source.
Claim 7
Dependent Claim
210 words
An arc welder defined in claim 2 further characterized by said means for connecting and disconnecting said second field winding to and from series relationship with the output current passing through said two output terminals comprising a switch means having at least three positions, said switch being so constructed and said second field winding being so connected thereto that at one of said three positions, said second field winding is removed from series relationship with the output current from said two output terminals, at a second of said three positions said second field winding is connected in series relationship with said output current with the connection being such that the output current flows through said second field winding in such a direction as to produce a magnetic field which opposes the magnetic field produced by said first field winding as excited by said variable voltage source, and at a third of said three positions said second field winding is connected in series relationship with said output current with the connection being such that the output current flows through said second field winding in such a magnetic direction as to produce a field which aids the magnetic field produced by said first field winding as excited by said variable voltage source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |