US4349813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blown fuse sensor
Assignee: Mitsubishi Electric Corp
•
Filing: 1980-01-14
•
Granted: 1982-09-14
•
Expires: 2000-01-14
Abstract
Abstract Each arm forming a three-phase full wave rectifier bridge includes a semiconductor diode, a current transformer and a fuse. The current transformer is connected to a pulse extinction indicator circuit through a pulse transformer. When no current flows through the arm for a predetermined time or more, the pulse extinction detection circuit produces a DC signal indicating the blowing of the fuse. The rectifier bridge, the current transformers, the fuses and the pulse extinction detection circuit are all disposed on the rotor of a brushless synchronous machine.
Inventors
- 👤 Naoto Ishibashi
- 👤 Ryosuke Taniguti
- 👤 Junichi Miyaji
- 👤 Yosaburo Ichinose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:57
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/04; H02K11/042; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A rotary electric machine comprising: a rotor; an AC source disposed on said rotor; a DC load disposed on said rotor; and a rotating rectifier device disposed on said rotor connecting said AC source to said DC load and including a series connection rectifier and a fuse; and a blown fuse sensor device disposed on said rotor for sensing occurrence of a failure of said rotating rectifier device, said blown fuse sensor device having a current transformer with a primary winding connected in series with said series connection, a secondary winding magnetically coupled to said primary winding for generating a pulse signal in response to a pulsating current flowing through said series connection, circuit means electrically coupled to said secondary winding for producing a signal indicative of the occurrence of a blowing of a fuse in response to an absence of said pulse signal for a predetermined period of time, an electrically insulating transformer connected between said secondary winding and said circuit means.
Claim 2
Dependent Claim
163 words
A rotary electric machine comprising: a rotor; an AC source disposed on said rotor; a DC load disposed on said rotor; and a rotating rectifier device disposed on said rotor connecting said AC source to said DC load and including a series connection rectifier and a fuse; and a blown fuse sensor device disposed on said rotor for sensing occurrence of a failure of said rotating rectifier device, said blown fuse sensor device having a current transformer with a primary winding connected in series with said series connection, a secondary winding magnetically coupled to said primary winding for generating a pulse signal in response to a pulsating current flowing through said series connection, circuit means electrically coupled to said secondary winding for producing a signal indicative of the occurrence of a blowing of a fuse in response to an absence of said pulse signal for a predetermined period of time, an electrically insulating transformer connected between said secondary winding and said circuit means.
Claim 3
Dependent Claim
20 words
A rotary electric machine as claimed in claim 1, wherein said electric rotary machine is a brushless synchronous rotary machine.
References Cited (Backward Citations)
GB704746A
Cited
US3030531A
Cited
US3205423A
Cited
US3200392A
Cited
US3462754A
Cited
JPS4523449B1
Cited
US3512073A
Cited
US3670231A
Cited
US3866196A
Cited
US4074346A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |