US3714533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sine pulse controller for variable reluctance motor
Assignee: Ford Motor Co
•
Filing: 1971-03-08
•
Granted: 1973-01-30
•
Expires: 1991-03-08
Abstract
Abstract Described is a control circuit for the application of direct current electrical energy to the winding of a variable reluctance motor. Brushless operation of the variable reluctance motor is achieved with a capacitor connected in series with the motor winding. A first solid state switching device is connected in parallel with the series combination of the capacitor and motor winding, and a second solid state switching device is connected in series with this parallel combination. A source of electrical energy is connected across the above described elements. A third solid state switching device may be connected in antiparallel with the second solid state switching device. The controller may be used to supply substantially pure half-sine waves to the motor winding.
Inventors
- 👤 L Unnewehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:46
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02P; H02P25/00; H02P25/02; H02P25/08; H02P25/092; H02P25/0925
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
210 words
In a variable reluctance motor having a winding that has a varying inductance during motor operation, a circuit for controlling the application of electrical energy to said winding, which comprises: a direct current source of electrical energy having a first terminal connected to one end of said winding and having a second terminal; a capacitor having first and second terminals, said first terminal being connected to the other end of said winding; a first thyristor having an anode and a cathode, said anoDe being connected to said second terminal of said capacitor and said cathode being connected to said one terminal of said winding, said first thyristor thus being connected in parallel with said capacitor and said winding; a second thyristor having an anode and a cathode, said second thyristor anode being connected to said second terminal of said source of electrical energy, and said second thyristor cathode being connected to said second terminal of said capacitor; and a third thyristor having an anode and a cathode, said anode of said third thyristor being connected to said cathode of said second thyristor, and said cathode of said third thyristor being connected to said anode of said second thyristor, said third thyristor thereby being connected in anti-parallel with said second thyristor.
Claim 2
Dependent Claim
210 words
In a variable reluctance motor having a winding that has a varying inductance during motor operation, a circuit for controlling the application of electrical energy to said winding, which comprises: a direct current source of electrical energy having a first terminal connected to one end of said winding and having a second terminal; a capacitor having first and second terminals, said first terminal being connected to the other end of said winding; a first thyristor having an anode and a cathode, said anoDe being connected to said second terminal of said capacitor and said cathode being connected to said one terminal of said winding, said first thyristor thus being connected in parallel with said capacitor and said winding; a second thyristor having an anode and a cathode, said second thyristor anode being connected to said second terminal of said source of electrical energy, and said second thyristor cathode being connected to said second terminal of said capacitor; and a third thyristor having an anode and a cathode, said anode of said third thyristor being connected to said cathode of said second thyristor, and said cathode of said third thyristor being connected to said anode of said second thyristor, said third thyristor thereby being connected in anti-parallel with said second thyristor.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |