Patent US3439200A successfully refreshed from Google Patents.
US3439200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible stepping motor with braking coils and biasing permanent magnets
Assignee: Yokogawa Electric Corp
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Filing: 1966-12-13
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Granted: 1969-04-15
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Expires: 1986-12-13
Abstract
No abstract record available.
Inventors
- 👤 Bunjiro Saito
- 👤 Tateo Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:18
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/10; H02K37/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A STEP MOTOR COMPRISING A ROTOR CORE HAVING A PLURALITY OF POLES SPACED APART AT SUBSTANTIALLY EQUIANGULAR INTERVALS, STATOR CORES OF AN INTEGRAL MULTIPLE OF 4 HAVING POLES SPACED APART AN ANGULAR DISTANCE SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE ADJACENT POLES OF THE ROTOR CORE, PERMANENT MAGNETS ENERGIZING THE STATOR CORES, TWO GROUPS OF EXCITING COILS WOULD ON THE STATOR CORES FOR NORMAL AND REVERSE ROTATION OF THE STEP MOTOR, EACH GROUP INCLUDING TWO PAIRS OF EXCITING COILS, AND MEANS FOR EXCITING THE TWO PAIRS OF EXCITING COILS OF ONE GROUP ALTERNATELY, A MAGNETIC FLUX PRODUCED BY THE PERMANENT MAGNETS IN THE STATOR CORES BEING REDUCED BY THE EXCITATION OF THE EXCITING COILS TO ROTATE THE ROTOR CORE, AND THE TWO PAIRS OF EXCITING COILS OF THE OTHER GROUP BEING SHORT-CIRCUITED FOR BRAKING OF THE ROTOR CORE, WHEREBY THE ROTOR IS DRIVEN STEP BY STEP ACCORDING TO THE OPERATION OF THE MEANS.
Claim 2
Dependent Claim
153 words
A STEP MOTOR COMPRISING A ROTOR CORE HAVING A PLURALITY OF POLES SPACED APART AT SUBSTANTIALLY EQUIANGULAR INTERVALS, STATOR CORES OF AN INTEGRAL MULTIPLE OF 4 HAVING POLES SPACED APART AN ANGULAR DISTANCE SUBSTANTIALLY EQUAL TO THE DISTANCE BETWEEN THE ADJACENT POLES OF THE ROTOR CORE, PERMANENT MAGNETS ENERGIZING THE STATOR CORES, TWO GROUPS OF EXCITING COILS WOULD ON THE STATOR CORES FOR NORMAL AND REVERSE ROTATION OF THE STEP MOTOR, EACH GROUP INCLUDING TWO PAIRS OF EXCITING COILS, AND MEANS FOR EXCITING THE TWO PAIRS OF EXCITING COILS OF ONE GROUP ALTERNATELY, A MAGNETIC FLUX PRODUCED BY THE PERMANENT MAGNETS IN THE STATOR CORES BEING REDUCED BY THE EXCITATION OF THE EXCITING COILS TO ROTATE THE ROTOR CORE, AND THE TWO PAIRS OF EXCITING COILS OF THE OTHER GROUP BEING SHORT-CIRCUITED FOR BRAKING OF THE ROTOR CORE, WHEREBY THE ROTOR IS DRIVEN STEP BY STEP ACCORDING TO THE OPERATION OF THE MEANS.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |