Direct-current motor with permanent-magnet rotor and sequentially energized stator windings
Abstract
Abstract An electric motor circuit is disclosed and includes a directcurrent motor having star-connected stator windings and a permanent magnet rotor. A sequential switching circuit connect each of the stator windings in sequential relation with a direct current supply during intermittent active intervals of time. A voltage-responsive circuit is connected to the stator windings for responding to voltages induced in each of the windings between the active intervals by the rotor. The voltage responsive circuit includes transistors each of which is connected at its emitter to the end of a corresponding one of the stator windings remote from the star point. The respective bases of the transistors are connected to the star point of the stator windings and the respective collectors to a common line so that through the collectors, the half-waves of the induced voltages of a polarity opposite to that of the supply voltage are decoupled from the stator windings.
Inventors
- 👤 H Richt
Bibliographic Details
Claims Analysis
Total Claims: 3References 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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |