US3564306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive device for battery energized sound recording apparatus
Assignee: Individual
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Filing: 1968-11-20
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Granted: 1971-02-16
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Expires: 1988-11-20
Abstract
Abstract A drive device for driving the sound record medium of battery energized sound recording apparatus comprises a battery supply and a direct current brushless motor energized from the battery supply and having a shaft driving the sound record medium. The shaft is thus a tone shaft. The motor comprises a stator having an axial bore formed therethrough and a rotor coaxially positioned around the stator. The stator has a plurality of half open slots formed therein and a multipole stator winding in the slots comprising a pair of separated phase windings mounted in the slots in a manner whereby they are electrically displaced by 90* each of the phase windings comprises two wires.
Inventors
- 👤 Hanns Ott
- 👤 Jurgen Wenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/26; G11B15/28; H; H02; H02K; H02K29/00; H02K29/06; H02K29/08; H02P; H02P6/00; H02P6/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A drive device for driving the sound record medium of battery energized sound recording apparatus, said drive device comprising a battery supply and a direct current brushless motor energized from said battery supply and having a shaft driving said sound record medium, said shaft thereby being a tone shaft, said motor comprising a stator having an axial bore formed therethrough and a rotor coaxially positioned around said stator, said stator having a plurality of half open slots formed therein and a multipole stator winding in said slots comprising a pair of separated phase windings mounted in said slots in a manner whereby they are electrically displaced by 90*, each of said phase windings comprising two wires, and further comprising control means in the bore formed through said stator for controlling the connection into circuit of the wires of said phase windings.
Claim 2
Dependent Claim
141 words
A drive device for driving the sound record medium of battery energized sound recording apparatus, said drive device comprising a battery supply and a direct current brushless motor energized from said battery supply and having a shaft driving said sound record medium, said shaft thereby being a tone shaft, said motor comprising a stator having an axial bore formed therethrough and a rotor coaxially positioned around said stator, said stator having a plurality of half open slots formed therein and a multipole stator winding in said slots comprising a pair of separated phase windings mounted in said slots in a manner whereby they are electrically displaced by 90*, each of said phase windings comprising two wires, and further comprising control means in the bore formed through said stator for controlling the connection into circuit of the wires of said phase windings.
Claim 3
Dependent Claim
43 words
A drive device as claimed in claim 1, wherein said control means comprises a magnetized control rotor mounted on the shaft of said motor in the bore of said stator and galvanomagnetic means in operative proximity with said control rotor in said bore.
Claim 4
Dependent Claim
80 words
A drive device as claimed in claim 1, further comprising circuit means for connecting into circuit a selected number of turns of each of said phase windings to enhance the efficiency of said motor at various rated speeds, and wherein said control means comprises a magnetized control rotor mounted on the shaft of said motor in the bore of said stator and galvanomagnetic elements in operative pRoximity with said control rotor in said bore and connected in said circuit means.
Claim 5
Dependent Claim
15 words
A drive device as claimed in claim 3, wherein said galvanomagnetic elements comprise Hall generators.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |