US3346792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless motors wherein commutation is controlled by an impedance responsive to rotor movement
Assignee: Hitachi Ltd
•
Filing: 1964-06-15
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Granted: 1967-10-10
•
Expires: 1984-06-15
Abstract
No abstract record available.
Inventors
- 👤 Noumi Makoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:55
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A BRUSHLESS MOTOR COMPRISING: (1) A PERMANENT MAGNET ROTOR, (2) A STATOR, (3) AN ARMATURE COIL WOUND AROUND SAID STATOR IN A MANNER TO PROVIDE CURRENT FLOW THERETHROUGH IN ALTERNATE DIRECTIONS, (4) FIRST AND SECOND AMPLIFIERS HAVING THEIR OUTPUTS APPLIED TO SAID ARMATURE COIL FOR SUPPLYING CURRENT FLOW THERETHROUGH IN ALTERNATE DIRECTIONS, (5) FIRST AND SECOND REACTANCE ELEMENTS OPERATIVELY COUPLED TO SAID FIRST AND SECOND AMPLIFIERS FOR CONTROLLING THE OPERATION OF SAID AMPLIFIERS, (6) MEANS FOR CONTINUOUSLY APPLYING A HIGH FREQUENCY SIGNAL TO BOTH SAID REACTANCE ELEMENTS, AND (7) MEANS FOR ALTERNATELY VARYING PRIMARILY ONLY THE IMPEDANCE VALUE OF ONE OF SAID REACTANCE ELEMENTS IN ACCORDANCE WITH ROTATION OF SAID ROTOR TO THEREBY TURN ON SAID FIRST AND SECOND AMPLIFIERS WHICH ALTERNATELY EXCITE SAID ARMATURE COIL ALTERNATELY WITH THE OUTPUTS OF SAID FIRST AND SECOND AMPLIFIERS.
Claim 2
Dependent Claim
136 words
A BRUSHLESS MOTOR COMPRISING: (1) A PERMANENT MAGNET ROTOR, (2) A STATOR, (3) AN ARMATURE COIL WOUND AROUND SAID STATOR IN A MANNER TO PROVIDE CURRENT FLOW THERETHROUGH IN ALTERNATE DIRECTIONS, (4) FIRST AND SECOND AMPLIFIERS HAVING THEIR OUTPUTS APPLIED TO SAID ARMATURE COIL FOR SUPPLYING CURRENT FLOW THERETHROUGH IN ALTERNATE DIRECTIONS, (5) FIRST AND SECOND REACTANCE ELEMENTS OPERATIVELY COUPLED TO SAID FIRST AND SECOND AMPLIFIERS FOR CONTROLLING THE OPERATION OF SAID AMPLIFIERS, (6) MEANS FOR CONTINUOUSLY APPLYING A HIGH FREQUENCY SIGNAL TO BOTH SAID REACTANCE ELEMENTS, AND (7) MEANS FOR ALTERNATELY VARYING PRIMARILY ONLY THE IMPEDANCE VALUE OF ONE OF SAID REACTANCE ELEMENTS IN ACCORDANCE WITH ROTATION OF SAID ROTOR TO THEREBY TURN ON SAID FIRST AND SECOND AMPLIFIERS WHICH ALTERNATELY EXCITE SAID ARMATURE COIL ALTERNATELY WITH THE OUTPUTS OF SAID FIRST AND SECOND AMPLIFIERS.
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |