Patent US4672965A successfully refreshed from Google Patents.
US4035699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless direct current machine and method of controlling the same
Assignee: Individual
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Filing: 1974-01-22
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Granted: 1977-07-12
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Expires: 1994-01-22
Abstract
Abstract In a brushless D. C. motor which is controlled by electronic circuits, the armature which is of the shorted drum type, is constructed in the form of a double or multiple coil winding which acts to prevent high circuit interruption potential which might damage the electronic control circuits. The double or multiple winding may be constructed as a double or multiple conductor winding. The multiple windings are separate one from the other and are connected together to supply terminals through the electronic control circuits.
Inventors
- 👤 Walter Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:33
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02K; H02K3/00; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A brushless direct-current machine having a rotor comprising: a plurality of at least four stationary coil windings connected in a loop; a plurality of switching means at least equal in number to said plurality of stationary coil windings for sequentially connecting said coil windings to a source of direct-current electrical energy; quenching means responsive to the energization of at least one of said switching means for connecting a next coil winding to said source of direct-current electrical energy to sequentially quench the energized switching means; and a plurality of substantially identical timing networks independent of any mechanical connection to the rotor to which a common voltage is applied for cyclically activating each of said switching means at a cycle speed dependent upon the magnitude of the applied voltage, said windings comprising at least double-parallel coil windings insulated from one another.
Claim 2
Dependent Claim
140 words
A brushless direct-current machine having a rotor comprising: a plurality of at least four stationary coil windings connected in a loop; a plurality of switching means at least equal in number to said plurality of stationary coil windings for sequentially connecting said coil windings to a source of direct-current electrical energy; quenching means responsive to the energization of at least one of said switching means for connecting a next coil winding to said source of direct-current electrical energy to sequentially quench the energized switching means; and a plurality of substantially identical timing networks independent of any mechanical connection to the rotor to which a common voltage is applied for cyclically activating each of said switching means at a cycle speed dependent upon the magnitude of the applied voltage, said windings comprising at least double-parallel coil windings insulated from one another.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |