Patent US4725751A successfully refreshed from Google Patents.
US4725751A
Expired / Lapsed
US
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Electrical machine
Assignee: Robert Bosch GmbH
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Filing: 1986-11-14
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Granted: 1988-02-16
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Expires: 2006-11-14
Abstract
Abstract An electrical machine is suggested, in particular an electrical commutated brushless direct current motor or tacho-alternator with a preferably permanent magnetic excitation and air slot winding, wherein the individual coils of the air slot winding are subdivided into at least two partial coils (14a,b to 21a,b) and are arranged in such a manner that the subsequent partial coils (14,15,16,17,18,19,20,21) encompass the preceding partial coils at both sides from the outside in the circumferential direction uniformlly large induced voltages are obtained when switching the different partial coils in series, so that a high running quietness is obtained in the motor operation and a low fluctuation is assured in the generated voltage in the alternator operation. The fluctuation of the measuring voltage being generated by a tacho alternator is almost completely suppressed if the rotor (11) of the machine is provided with a pole retraction space (31), whereby a flattening of the crests of the sinus like induced voltages occurs in form of a trapezoidal like voltage path.
Inventors
- 👤 Rali Bassler
- 👤 Hartmut Betsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:57
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46; G01P3/465; H02K3/00; H02K3/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
188 words
An electrical machine comprising: a rotor having a outer radial side and a central area; a plurality of magnets secured to said side; a stator surrounding said plurality of magnets so as to form an air slot therebetween; a multiphase winding having a plurality of adjacent coils arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils constituting two partial coils arranged radially apart from each other so that only one common circumferential center line is passable circumferentially between said two partial coils of all of said adjacent coils, said winding being formed to receive an induced voltage; and means for reducing a fluctuation of the induced voltage received by said multiphase winding and including at least two of said partial coils of one phase circumferentially nesting therebetween at least an adjacent one of said partial coils of another of said phases, said two partial coils of each of said adjacent coils being arranged symmetrically with respect to the common circumferential center line so that the induced voltage is uniform.
Claim 2
Dependent Claim
188 words
An electrical machine comprising: a rotor having a outer radial side and a central area; a plurality of magnets secured to said side; a stator surrounding said plurality of magnets so as to form an air slot therebetween; a multiphase winding having a plurality of adjacent coils arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils constituting two partial coils arranged radially apart from each other so that only one common circumferential center line is passable circumferentially between said two partial coils of all of said adjacent coils, said winding being formed to receive an induced voltage; and means for reducing a fluctuation of the induced voltage received by said multiphase winding and including at least two of said partial coils of one phase circumferentially nesting therebetween at least an adjacent one of said partial coils of another of said phases, said two partial coils of each of said adjacent coils being arranged symmetrically with respect to the common circumferential center line so that the induced voltage is uniform.
Claim 3
Dependent Claim
25 words
The electrical machine in accordance with claim 1, characterized in that each partial coil (14a, b to 21a, b) has a same sized coil width.
Claim 4
Dependent Claim
36 words
The electrical machine in accordance with claim 1, characterized by a four pole design of said rotor with four coils per phase which can be switched on successively in circumferential directions in a range of 45°.
Claim 5
Dependent Claim
28 words
The electrical machine in accordance with claim 1, characterized in that the partial coils (14a, b to 21a, b) are mounted on a coil receiver composed of plastic.
Claim 6
Dependent Claim
58 words
The electrical machine in accordance with claim 1, characterized in that each of said magnets have a center and two ends, said center being retracted relative to said ends so as to enlarge the air slot in the circumferential direction from said ends to said center such that a trapezoidal-like induced voltage results in said partial coils individually.
Claim 7
Dependent Claim
16 words
The electrical machine as defined in claim 1, wherein said magnets are formed as permanent magnets.
Claim 8
Dependent Claim
31 words
The electrical machine as defined in claim 1, further comprising means for supporting said multiphase winding and including an electrically nonconductive material secured to said stator and supporting said multiphase winding.
Claim 9
Dependent Claim
18 words
The electrical machine as defined in claim 7, wherein said electrically nonconductive material is also a diamagnetic material.
Claim 10
Dependent Claim
133 words
An electrical machine comprising: a rotor having a outer radial side; a plurality of magnets secured to said side; a stator radially surrounding and spaced from said plurality of magnets; a multiphase winding having a plurality of adjacent coils arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils being divided into a pair of partial coils arranged radially apart from each other, said multiphase winding being formed to receive an induced voltage; and means for reducing a fluctuation of the induced voltage received by said multiphase winding and including said pair of partial coils of one phase being circumferentially inserted between an immediately adjacent two of said pairs of partial coils of different phases.
Claim 11
Dependent Claim
133 words
An electrical machine comprising: a rotor having a outer radial side; a plurality of magnets secured to said side; a stator radially surrounding and spaced from said plurality of magnets; a multiphase winding having a plurality of adjacent coils arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils being divided into a pair of partial coils arranged radially apart from each other, said multiphase winding being formed to receive an induced voltage; and means for reducing a fluctuation of the induced voltage received by said multiphase winding and including said pair of partial coils of one phase being circumferentially inserted between an immediately adjacent two of said pairs of partial coils of different phases.
Claim 12
Dependent Claim
31 words
The electrical machine as defined in claim 9, further comprising: means for supporting said multiphase winding and including an electrically non-conductive material secured to said stator and supporting said multiphase winding.
Claim 13
Dependent Claim
15 words
The electrical machine as defined in claim 10, wherein said electrically nonconductive material is diamagnetic.
Claim 14
Dependent Claim
27 words
The electrical machine as defined in claim 9 wherein said stator has an inner wall facing said rotor, said multiphase winding being secured to said inner wall.
Claim 15
Dependent Claim
227 words
An electrical machine comprising: a rotor having a outer radial side and a central area; a plurality of magnets secured to said side, each of said magnets having a center and two ends; a stator surrounding said plurality of magnets so as to form an air slot therebetween; a four phase winding having a plurality of adjacent coils bifilar wound and arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils constituting two partial coils arranged radially apart from each other, said winding being formed to receive an induced voltage; means for reducing a fluctuation of the induced voltage received by said winding and including at least two of said partial coils of one phase circumferentially nesting therebetween at least an adjacent oneof said partial coils of another of said phases; and means for making said induced voltage be trapezoidal-like in each individual one of said partial coils and including said center of each of said magnets being formed retracted relative to said ends so as to radially enlarge said air slot in a circumferential direction from said ends to said center, all of said partial coils are arranged so as to be electrically switchable successively in a circumferential direction over a range of 45° which is 90° electric.
Claim 16
Dependent Claim
227 words
An electrical machine comprising: a rotor having a outer radial side and a central area; a plurality of magnets secured to said side, each of said magnets having a center and two ends; a stator surrounding said plurality of magnets so as to form an air slot therebetween; a four phase winding having a plurality of adjacent coils bifilar wound and arranged between said rotor and said stator circumferentially, each of said coils having a phase different from that of said coils immediately adjacent thereto, each of said coils constituting two partial coils arranged radially apart from each other, said winding being formed to receive an induced voltage; means for reducing a fluctuation of the induced voltage received by said winding and including at least two of said partial coils of one phase circumferentially nesting therebetween at least an adjacent oneof said partial coils of another of said phases; and means for making said induced voltage be trapezoidal-like in each individual one of said partial coils and including said center of each of said magnets being formed retracted relative to said ends so as to radially enlarge said air slot in a circumferential direction from said ends to said center, all of said partial coils are arranged so as to be electrically switchable successively in a circumferential direction over a range of 45° which is 90° electric.
Claim 17
Dependent Claim
62 words
The electrical machine as defined in claim 13, wherein said two partial coils of each of said adjacent coils is arranged so that only one common circumferential center line is passable circumferentially therebetween, said two partial coils of each of said adjacent coils being further arranged symmetric with respect to the common circumferential center line so that the induced voltage is uniform.
Claim 18
Dependent Claim
75 words
The electrical machine as defined in claim 9, wherein said pair of partial coils of all of said adjacent coils is arranged so that only one common circumferential center line is passable circumferentially between said pair of partial coils of all of said adjacent coils, said pair of partial coils of each of said adjacent coils being further arranged symmetrically with respect to the common circumferential center line so that the induced voltage is uniform.
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) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |