US4024455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary inverters for converting D.C. to A.C.
Assignee: ZF International UK Ltd
•
Filing: 1976-03-04
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Granted: 1977-05-17
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Expires: 1996-03-04
Abstract
Abstract A rotary inverter for converting d.c. to a.c. includes a rotary field winding and a stationary armature including two windings. One winding is supplied with d.c. switched in synchronism with the rotation of the field winding. The other winding is electrically isolated from the first mentioned winding but is magnetically coupled thereto and provides the a.c. output. The two windings occupy the same slots in the armature.
Inventors
- 👤 Christopher John Yarrow
- 👤 Ronald Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:29
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/20; H02M1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A rotary inverter comprising the combination of a rotary field winding, a stationary armature winding including two separate winding portions which are electrically isolated from one another but magnetically coupled together, switching means for controlling the connection of a d.c. supply to tappings on one armature winding portion in synchronism with the rotation of the field winding, and a.c. output terminals connected to the other armature winding portion.
Claim 2
Dependent Claim
68 words
A rotary inverter comprising the combination of a rotary field winding, a stationary armature winding including two separate winding portions which are electrically isolated from one another but magnetically coupled together, switching means for controlling the connection of a d.c. supply to tappings on one armature winding portion in synchronism with the rotation of the field winding, and a.c. output terminals connected to the other armature winding portion.
Claim 3
Dependent Claim
26 words
A rotary inverter as claimed in claim 1 in which said one armature winding portion is a mesh winding and the other is a star-connected winding.
Claim 4
Dependent Claim
32 words
A rotary inverter as claimed in claim 2 in which the armature windings are supported in slots in an armature of ferromagnetic material, the same slots being used for both armature portion.
Claim 5
Dependent Claim
32 words
A rotary inverter as claimed in claim 3 in which each armature slot is shaped to provide a pair of ribs on the sides of the slot separating the two winding portions.
References Cited (Backward Citations)
AT80103B
Cited
US1300308A
Cited
US1613625A
Cited
US1604431A
Cited
US1831564A
Cited
US2253966A
Cited
US2761081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |