US6744240B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the efficiency of an electrical machine
Assignee: Robert Bosch GmbH
•
Filing: 2001-05-09
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Granted: 2004-06-01
•
Expires: 2021-05-09
Abstract
Abstract A method for operating an electrical machine ( 1 ) for the production of electrical power ( 13 ) includes an excitation winding ( 2 ) and a stator winding ( 4 ). A converter configuration ( 6 ), e.g., a pulse-width modulation inverter, is located downstream from the electrical machine ( 1 ). In the lower speed range, the output of electrical power ( 12 ) takes place along the torque line ( 29 ) independently of the number of coils w 1 , w 2 in a stator winding ( 4 ). In the upper speed range, the output of electrical power ( 12 ) takes place via a stator winding ( 4 ) having a small number of coils w 2 .
Inventors
- 👤 Gerhard Koelle
- 👤 Kurt Reutlinger
- 👤 Begir Pushkolli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:15
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305; H02P9/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
A method for operating an electrical machine ( 1 ) for an output of electrical power ( 12 ) comprising an excitation winding ( 2 ) and a stator winding ( 4 ), wherein a converter configuration is located downstream of the electrical machine, wherein, in a range of an idle speed of an internal combustion engine, the output of electrical power ( 12 ) takes place along a torque line ( 29 ) independently of a number of coils w 1 , w 2 and, in a speed range above the idle speed of the internal combustion engine, the output of electrical power ( 12 ) takes place via an electrical machine ( 1 ) having a stator winding ( 4 ) comprising a small number of coils w 2 , wherein a voltage difference between a vehicle electrical system ( 10 ) of a motor vehicle and machine terminals ( 5 ) is compensated for by means of a pulse-width modulation inverter ( 6 ), wherein the pulse-width modulation inverter is configured to include semi-conductor components arranged in parallel to one-way diodes, thereby enabling operation of the engine over an entire range of operation.
Claim 2
Independent Claim
196 words
A method for operating an electrical machine ( 1 ) for an output of electrical power ( 12 ) comprising an excitation winding ( 2 ) and a stator winding ( 4 ), wherein a converter configuration is located downstream of the electrical machine, wherein, in a range of an idle speed of an internal combustion engine, the output of electrical power ( 12 ) takes place along a torque line ( 29 ) independently of a number of coils w 1 , w 2 and, in a speed range above the idle speed of the internal combustion engine, the output of electrical power ( 12 ) takes place via an electrical machine ( 1 ) having a stator winding ( 4 ) comprising a small number of coils w 2 , wherein a voltage difference between a vehicle electrical system ( 10 ) of a motor vehicle and machine terminals ( 5 ) is compensated for by means of a pulse-width modulation inverter ( 6 ), wherein the pulse-width modulation inverter is configured to include semi-conductor components arranged in parallel to one-way diodes, thereby enabling operation of the engine over an entire range of operation.
Claim 3
Dependent Claim
44 words
The method according to claim 1 , wherein, in the idle speed range of the internal combustion engine, the power output ( 12 ) of the electrical machine ( 1 ) takes place via a configuration of the pulse-width modulation inverter ( 6 ).
Claim 4
Dependent Claim
41 words
The method according to claim 1 , wherein the pulse-width modulation inverter ( 6 ) processes a current that is inversely proportional to the number of coils of the stator winding ( 4 ) of the electrical machine ( 1 ).
Claim 5
Dependent Claim
47 words
The method according to claim 1 , wherein the output of electrical power ( 12 ) above the idle speed range takes place according to a power curve ( 24 ) of an electrical machine ( 1 ) having a small number of coils w 2 .
Claim 6
Dependent Claim
46 words
The method according to claim 1 , wherein by operating the electrical machine ( 1 ) using a pulse-width modulation inverter ( 6 ), the number of stator windings can be selected independently of an inception speed ( 25 . 1 , 25 . 2 ).
Claim 7
Dependent Claim
51 words
The method according to claim 1 , wherein, in a speed range below the idle speed range, the output of electrical power ( 12 ) takes place up to a maximum value ( 27 ) according to the torque line ( 29 ) via the pulse-width modulation inverter ( 6 ).
Claim 8
Dependent Claim
38 words
The method according to claim 1 , wherein an average efficiency of the electrical machine ( 1 ) is increased by outfitting the electrical machine ( 1 ) with a selectively minimal number of coils w 2 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-06-01 | 2007-12-01 | 2008-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-06-01 | 2011-12-01 | 2012-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-06-01 | 2015-12-01 | 2016-06-01 | $7700.00 | Window Closed / Lapsed |