US3242405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brushless electric motor
Assignee: Hitachi Ltd
•
Filing: 1963-04-23
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Granted: 1966-03-22
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Expires: 1983-04-23
Abstract
No abstract record available.
Inventors
- 👤 Ikegami Kazutoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:51
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12; H02P; H02P6/00; H02P6/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A BRUSHLESS ELECTRIC MOTOR EQUIPPED WITH A STATOR HAVING WINDING, A ROTOR SHAFT, AND A ROTOR THEREON, COMPRISING IN COMBINATION, AN OSCILLATOR WHICH CONTINUOUSLY GENERATES A HIGH-FREQUENCY SIGNAL IRRESPECTIVE OF THE ROTATION OF THE ROTOR; A FIXED PRIMARY COIL WHICH IS WOUND CONCENTRICALLY ABOUT THE ROTOR SHAFT OF THE MOTOR; A ROTARY SECONDARY COIL WHICH IS WOUND AROUND SAID ROTOR SHAFT AND IS CONSTANTLY IN A STATE OF ELECTROMAGNETIC INDUCTIVE COUPLING WITH SAID FIXED PRIMARY COIL IRRESPECTIVE OF THE ROTATION OF THE ROTOR; MEANS FOR SUPPLYING A HIGHFREQUENCY SIGNAL, GENERATED IN SAID ROTARY SECONDARY COIL, TO A ROTARY COIL WHICH IS FIXED AT AN APPROPRIATE POSITION ON THE ROTOR SHAFT; A PLURALITY OF PICK-UP COILS WHICH ARE DISPOSED AT CERTAIN FIXED POSITIONS WITH EQUAL SPACING CONCENTRICALLY ABOUT THE ROTOR SHAFT AND SELECTIVELY EFFECT ELECTROMAGNETIC INDUCTIVE COUPLING WITH THE ROTARY COIL IN ACCORDANCE WITH THE ROTATION OF SAID ROTOR; AND MEANS FOR AMPLIFYING THE OUTPUT OF EACH PICK-UP COIL WHEREBY ELECTRIC CURRENT FLOWING IN THE STATOR WINDINGS IS CONTROLLED.
Claim 2
Dependent Claim
168 words
A BRUSHLESS ELECTRIC MOTOR EQUIPPED WITH A STATOR HAVING WINDING, A ROTOR SHAFT, AND A ROTOR THEREON, COMPRISING IN COMBINATION, AN OSCILLATOR WHICH CONTINUOUSLY GENERATES A HIGH-FREQUENCY SIGNAL IRRESPECTIVE OF THE ROTATION OF THE ROTOR; A FIXED PRIMARY COIL WHICH IS WOUND CONCENTRICALLY ABOUT THE ROTOR SHAFT OF THE MOTOR; A ROTARY SECONDARY COIL WHICH IS WOUND AROUND SAID ROTOR SHAFT AND IS CONSTANTLY IN A STATE OF ELECTROMAGNETIC INDUCTIVE COUPLING WITH SAID FIXED PRIMARY COIL IRRESPECTIVE OF THE ROTATION OF THE ROTOR; MEANS FOR SUPPLYING A HIGHFREQUENCY SIGNAL, GENERATED IN SAID ROTARY SECONDARY COIL, TO A ROTARY COIL WHICH IS FIXED AT AN APPROPRIATE POSITION ON THE ROTOR SHAFT; A PLURALITY OF PICK-UP COILS WHICH ARE DISPOSED AT CERTAIN FIXED POSITIONS WITH EQUAL SPACING CONCENTRICALLY ABOUT THE ROTOR SHAFT AND SELECTIVELY EFFECT ELECTROMAGNETIC INDUCTIVE COUPLING WITH THE ROTARY COIL IN ACCORDANCE WITH THE ROTATION OF SAID ROTOR; AND MEANS FOR AMPLIFYING THE OUTPUT OF EACH PICK-UP COIL WHEREBY ELECTRIC CURRENT FLOWING IN THE STATOR WINDINGS IS CONTROLLED.
References Cited (Backward Citations)
US2980839A
Cited
US3091728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |