US4381466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic central rotary coupling
Assignee: Siemens AG
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Filing: 1981-03-16
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Granted: 1983-04-26
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Expires: 2001-03-16
Abstract
Abstract The invention relates to a magnetic rotary coupling with outer magnetic devices on a rotary outer coupling member and an inner magnetic device on a rotary inner coupling member. The inner magnetic device includes permanent magnets spaced radially out from the axis, each such magnet having a magnetic axis perpendicular to a radius from the axis. The outer devices include permanent magnets having magnetic axes approximately radial with respect to the axis. Pole faces of the outer member are aligned with faces of opposite polarity of the inner member magnets to minimize the lengths of the flux loops linking the inner and outer magnets. A high-permeability shield bridges the outer poles of the outer member to reduce the total reluctance further, thereby maximizing the torque that can be transmitted between the inner and outer members.
Inventors
- 👤 Werner Laenens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:49
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/106; H02K5/00; H02K5/04; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
Magnetic central rotary coupling with (a) an inner coupling half having disposed thereon an inner magnetic device with its longitudinal axis transverse to the axis of rotation, said inner magnetic device including two pairs of magnet poles, one pair at each longitudinal end thereof; and (b) an outer coupling half having first and second outer magnetic devices disposed thereon symmetrical to the longitudinal axis of the inner magnetic device, the magnet poles of said outer magnetic device adjacent to those of the inner magnetic device and aligned at an angle of approximately 30° to the longitudinal axis of the inner magnetic device, the improvement comprising said inner and first and second outer magnetic devices each containing two rod shaped permanent magnets, the rod shaped permanent magnets of the outer magnetic devices being situated at the locations of the magnet poles of said devices and the rod shaped permanent magnets of said inner magnetic device situated so that their magnet poles are aligned at an angle of 90° to the longitudinal axis.
Claim 2
Dependent Claim
171 words
Magnetic central rotary coupling with (a) an inner coupling half having disposed thereon an inner magnetic device with its longitudinal axis transverse to the axis of rotation, said inner magnetic device including two pairs of magnet poles, one pair at each longitudinal end thereof; and (b) an outer coupling half having first and second outer magnetic devices disposed thereon symmetrical to the longitudinal axis of the inner magnetic device, the magnet poles of said outer magnetic device adjacent to those of the inner magnetic device and aligned at an angle of approximately 30° to the longitudinal axis of the inner magnetic device, the improvement comprising said inner and first and second outer magnetic devices each containing two rod shaped permanent magnets, the rod shaped permanent magnets of the outer magnetic devices being situated at the locations of the magnet poles of said devices and the rod shaped permanent magnets of said inner magnetic device situated so that their magnet poles are aligned at an angle of 90° to the longitudinal axis.
Claim 3
Dependent Claim
40 words
A central rotary coupling according to claim 1 wherein magnet poles of the rod shaped permanent magnets of the inner magnetic device having the same polarity are situated on different sides of the longitudinal axis of said inner magnetic device.
Claim 4
Dependent Claim
40 words
A central rotary coupling according to claim 1 wherein magnet poles of the rod shaped permanent magnets of the inner magnetic device having the same polarity are situated on the same sides of the longitudinal axis of said magnetic device.
Claim 5
Dependent Claim
29 words
A central rotary coupling according to one of claims 1, 2 or 3 and further comprising a shaft supporting said inner coupling half consisting of a magnetically non-conductive material.
Claim 6
Dependent Claim
43 words
A central rotary coupling according to one of claims 1, 2 or 3 and further comprising a magnetically conducting return ring arranged at the outer coupling half, said ring surrounding said rod shaped permanent magnets of said outer magnetic devices on the outside.
Claim 7
Dependent Claim
29 words
A central rotary coupling according to one of claims 1, 2 or 3 wherein said rod shaped permanent magnet consists of a sintered material of cobalt and rare earths.
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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |