US4491769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary electric machine
Assignee: Individual
•
Filing: 1982-05-24
•
Granted: 1985-01-01
•
Expires: 2002-05-24
Abstract
Abstract A rotary electric machine (motor or generator) comprises a first functional member and a second functional member rotatable with respect to the first one. One of the two functional members comprises a plurality of permanent magnet poles distributed in a ring arrangement, while the other one comprises a plurality of switchable electromagnet poles disposed in a ring arrangement opposite the permanent magnet poles, with an air gap in between. The numbers of permanent magnet poles and electromagnet poles either may be exactly or almost the same. At least one electronic circuit means controlled by at least one sensor detecting the rotational relative positions of the two functional members is provided for switching the electromagnet poles in the respective suitable direction of current flow and for the period of time of functional suitable relative positions with respect to the permanent magnet poles.
Inventors
- 👤 Gotz Heidelberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:32
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
244 words
A rotary electric machine characterized by the combination of the following features: (a) a first functional member and a second functional member are provided, one of which is rotatable with respect to the other, an air gap existing between the two surfaces facing each other of the two functional members; (b) one of the two functional members comprises a plurality of permanent magnet poles of alternating polarity distributed in a ring arrangement at the side facing the air gap; (c) the permanent magnet poles are provided by permanent magnets having a coefficient of permeability in the order of the permeability of air (μ=1); (d) the other one of the two functional members comprises a plurality of switchable electromagnet poles distributed in a ring arrangement at the side facing the air gap; (e) the number of permanent magnet poles and the number of electromagnet poles differ by a small integer; (f) a plurality of electronic circuit means, each having four controllable semiconductor switch elements and each being connected to at least a respective one of said electromagnet poles, is provided for switching the electromagnet poles in the respective proper direction of current during the period of a suitable relative functional position with respect to a permanent magnet pole; (g) each of the electronic circuit means is controlled by at least one sensor disposed at the functional member which is provided with the electromagnet poles and detecting the rotational relative positions of the two functional members.
Claim 2
Dependent Claim
244 words
A rotary electric machine characterized by the combination of the following features: (a) a first functional member and a second functional member are provided, one of which is rotatable with respect to the other, an air gap existing between the two surfaces facing each other of the two functional members; (b) one of the two functional members comprises a plurality of permanent magnet poles of alternating polarity distributed in a ring arrangement at the side facing the air gap; (c) the permanent magnet poles are provided by permanent magnets having a coefficient of permeability in the order of the permeability of air (μ=1); (d) the other one of the two functional members comprises a plurality of switchable electromagnet poles distributed in a ring arrangement at the side facing the air gap; (e) the number of permanent magnet poles and the number of electromagnet poles differ by a small integer; (f) a plurality of electronic circuit means, each having four controllable semiconductor switch elements and each being connected to at least a respective one of said electromagnet poles, is provided for switching the electromagnet poles in the respective proper direction of current during the period of a suitable relative functional position with respect to a permanent magnet pole; (g) each of the electronic circuit means is controlled by at least one sensor disposed at the functional member which is provided with the electromagnet poles and detecting the rotational relative positions of the two functional members.
Claim 3
Dependent Claim
32 words
The machine as claimed in claim 1, characterized in that one of the two functional members is disposed inside the other functional member such as to establish an essentially cylindrical air gap.
Claim 4
Dependent Claim
21 words
The machine as claimed in claim 2, characterized in that the permanent magnet poles are arranged at the outer functional member.
Claim 5
Dependent Claim
30 words
The machine as claimed in claim 2 or 3, characterized in that the inner functional member is stationary, and in that the outer, rotatable functional member is of cup shape.
Claim 6
Dependent Claim
24 words
The machine as claimed in claim 1, characterized in that the permanent magnets are made of a material based on rare earths and cobalt.
Claim 7
Dependent Claim
47 words
The machine as claimed in claim 1, characterized in that each of said plurality of electronic circuit means is coupled, for common switching, to each of a partial number of electromagnet poles located in at least essentially the same relative positions with respect to permanent magnet poles.
Claim 8
Dependent Claim
16 words
The machine as claimed in claim 1, characterized in that Hall detectors are provided as sensors.
Claim 9
Dependent Claim
36 words
The machine as claimed in claim 1, characterized in that the electromagnet poles are embodied by structural elements which were individually provided with a winding and secured to the respective functional member prior to the assembly.
Claim 10
Dependent Claim
15 words
The machine as claimed in claim 8, characterized in that the structural elements are identical.
Claim 11
Dependent Claim
24 words
The machine as claimed in claim 9, characterized in that the electromagnets are arranged in the circumferential direction with their feet in contiguous relation.
Claim 12
Dependent Claim
32 words
The machine as claimed in claim 1, characterized in that the permanent magnets are arranged in circumferential direction to abut directly against one another or through the intermission of thin plastic layers.
Claim 13
Dependent Claim
49 words
The machine as claimed in claim 1, characterized in that the pitch of the arrangement of the permanent magnet poles and/or the length of the permanent magnet poles in the circumferential direction of rotation essentially corresponds to the length of the electromagnet poles in the circumferential direction of rotation.
Claim 14
Dependent Claim
26 words
The machine as defined in claim 1 or 6 wherein a large number of permanent magnet poles and a large number of electromagnet poles are provided.
Claim 15
Dependent Claim
17 words
The machine as defined in claim 13 wherein said large number of electromagnet poles is approximately 30.
Claim 16
Dependent Claim
24 words
The machine as defined in claim 1 wherein the number of said permanent magnetic poles is larger than the number of said electromagnet poles.
Claim 17
Dependent Claim
30 words
The machine as defined in claim 1 or 6 wherein said four controllable semiconductor switch elements of each of said electronic circuit means are connected in a respective bridge circuit.
References Cited (Backward Citations)
US1422414A
Cited
US1958753A
Cited
DE1033769B
Cited
DE1267333B
Cited
US3158750A
Cited
US3286147A
Cited
US3707924A
Cited
FR2012981A1
Cited
US3683248A
Cited
US3586942A
Cited
CH526221A
Cited
FR2099961A5
Cited
DE2245557A1
Cited
US3740630A
Cited
US3866104A
Cited
US4012652A
Cited
US3942083A
Cited
FR2267650A1
Cited
FR2268377A1
Cited
US4107587A
Cited
US4255696A
Cited
US4131828A
Cited
US4182967A
Cited
GB2005926A
Cited
US4223255A
Cited
BE867436A
Cited
DE2930649A1
Cited
EP0018904A1
Cited
US4382214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |