US3614593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary transformer for alternator
Assignee: Motorola Solutions Inc
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Filing: 1970-05-06
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Granted: 1971-10-19
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Expires: 1990-05-06
Abstract
Abstract An alternator having a stator winding for applying alternating current voltage to output terminals thereof has a rotor rotatably mounted therein adjacent the stator to induce the alternating current voltage into the stator. A rotary transformer secured to one end of the rotor shaft has a rotary secondary winding and a core thereof in axial alignment with the rotor shaft and includes a single wire connection between the rotary secondary winding and the alternator rotor winding to transfer the excitation voltage induced in the secondary of the rotary transformer into the rotor winding.
Inventors
- 👤 Melvin A Lace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:24
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/16; H02K19/26; H01; H01F; H01F38/00; H01F38/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
An alternator comprising, in combination: a support means; a stator winding secured to said support means and arrangeD for applying an alternating current voltage to output terminals of the alternator; a shaft rotatably mounted at axially spaced-apart support bearings held by said support means; a rotor winding formed on the said shaft between said axially spaced-apart support bearings and arranged to induce an alternating current voltage into said stator winding when rotating relative thereto; an excitation means secured to said support means outwardly of one of said axially spaced-apart support bearings and arranged for receiving directly an excitation signal; a support stud; means formed at one end of said shaft to receive said support stud in substantial concentric axial alignment with said shaft and in a spaced relation to said excitation means; inductance means carried by said support stud to be in a close running fit with said excitation means inductively to receive said excitation signal; and means connecting said inductive means with said rotor winding to apply the excitation signal so received to said rotor winding to cause a magnetic field therein and induce an alternating current voltage output at said stator winding.
Claim 2
Dependent Claim
194 words
An alternator comprising, in combination: a support means; a stator winding secured to said support means and arrangeD for applying an alternating current voltage to output terminals of the alternator; a shaft rotatably mounted at axially spaced-apart support bearings held by said support means; a rotor winding formed on the said shaft between said axially spaced-apart support bearings and arranged to induce an alternating current voltage into said stator winding when rotating relative thereto; an excitation means secured to said support means outwardly of one of said axially spaced-apart support bearings and arranged for receiving directly an excitation signal; a support stud; means formed at one end of said shaft to receive said support stud in substantial concentric axial alignment with said shaft and in a spaced relation to said excitation means; inductance means carried by said support stud to be in a close running fit with said excitation means inductively to receive said excitation signal; and means connecting said inductive means with said rotor winding to apply the excitation signal so received to said rotor winding to cause a magnetic field therein and induce an alternating current voltage output at said stator winding.
Claim 3
Dependent Claim
106 words
The alternator of claim 1 wherein said excitation winding includes a cylindrical magnetic pole piece having radially inwardly turned ends axially extending a given distance, an excitation winding formed on said pole piece between said radially inwardly turned ends, and said inductance means carried by said support stud includes a magnetic core member axially positioned within the cylindrical magnetic pole piece and held by said support stud, and having radially outwardly turned ends in close proximity with the radially inwardly turned ends of said magnetic pole piece, and an inductance winding on said magnetic core between its ends and connected in circuit with said rotor winding.
Claim 4
Dependent Claim
46 words
The alternator of claim 2 wherein said magnetic core member has radially outwardly turned ends which extend axially a distance less than the given distance of the radially inwardly turned ends of said magnetic pole piece to be at all times in magnetic flux registry therewith.
Claim 5
Dependent Claim
62 words
The alternator of claim 1 wherein said inductance means includes a magnetic core member axially held in position at the end of said shaft by said support stud, said magnetic core member having a diameter less than the diameter of said shaft to allow removal of the bearing means at that end of said shaft without removal of said magnetic core member.
Claim 6
Dependent Claim
71 words
The alternator of claim 1 wherein said means formed at one end of said shaft is a recess having a smooth wall portion extending perpendicular to the axis of said shaft, and further including a flanged sleeve through which said support stud passes, the flange portion thereof being perpendicular to the axis of said shaft and engaged with said recess to ensure axial alignment of said inductance means with said shaft.
Claim 7
Dependent Claim
95 words
The alternator of claim 1 wherein said inductance means includes a core member of powdered hydrogen annealed iron having an axial aperture for receiving said support stud, and said support stud has a threaded portion formed at one end thereof to engage the end of said shaft and a head formed at the other end thereof to apply pressure to said core member to hold the same in position, and a resilient washer interposed between said core member and said head of said support stud to compensate for expansion and contraction of said core member.
Claim 8
Dependent Claim
51 words
The alternator of claim 1 wherein said inductance means includes a winding which has one end thereof connected to the rotor winding of said alternator through a single wire and the other end thereof electrically connected through said shaft to effect a second connection to the rotor winding of the alternator.
Claim 9
Dependent Claim
24 words
The alternator of claim 1 wherein said excitation means and said inductance means include closely spaced core members formed of powdered hydrogen annealed iron.
References Cited (Backward Citations)
US3522520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |