US6047104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical generators and motors in which at steady-state the rotor and its electromagnetic field rotate at selectively different angular speeds
Assignee: Cheng Power Systems Inc
•
Filing: 1998-09-22
•
Granted: 2000-04-04
•
Expires: 2018-09-22
Abstract
Abstract A rotating field, synchronized electric generator or motor in which the magnetic field that the armature produces can rotate relative to the stator at a speed significantly different from that of the armature, under electronic or other control that obviates the need for a mechanical torque-carrying gearbox that can be used for a similar purpose in a synchronized generator or motor.
Inventors
- 👤 Dah Yu Cheng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:04
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/60; H02K13/00; H02K27/00; H02K27/20
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
61 words
A synchronous electrical machine operating at steady-state as a power generator or as a motor, comprising: a non-rotating stator; an armature rotating relative to the stator at a first angular speed and producing an armature magnetic field rotating relative to the stator at a second angular speed that differs by a selected amount from the first angular speed at steady state.
Claim 2
Dependent Claim
61 words
A synchronous electrical machine operating at steady-state as a power generator or as a motor, comprising: a non-rotating stator; an armature rotating relative to the stator at a first angular speed and producing an armature magnetic field rotating relative to the stator at a second angular speed that differs by a selected amount from the first angular speed at steady state.
Claim 3
Dependent Claim
52 words
An electrical machine as in claim 1 in which the armature comprises a number of windings connected to respective commutator segments and a power source supplying power to the segments in a time sequence corresponding to the second angular speed while the armature rotates at the first angular speed at steady state.
Claim 4
Dependent Claim
27 words
An electrical machine as in claim 2 in which the power source comprises a switching arrangement powering the commutator segments in a selected sequence at steady state.
Claim 5
Dependent Claim
47 words
An electrical machine as in claim 3 in which the switching arrangement comprises a set of light emitters energized in a selected sequence and a set of light detectors responding to energization of the light emitters to enable switching elements powering respective commutator segments at steady state.
Claim 6
Dependent Claim
159 words
A synchronous electrical machine operating at steady-state as a power generator or as a motor, comprising: a stator; an armature rotating relative to the stator at a first angular speed and producing an armature magnetic field rotating relative to the stator at a second angular speed that differs by a selected amount from the first angular speed; in which the armature comprises a number of windings connected to respective commutator segments and a power source supplying power to the segments in a time sequence corresponding to the second angular speed while the armature rotates at the first angular speed; in which the power source comprises a switching arrangement powering the commutator segments in a selected sequence; and in which the switching arrangement comprises brushes making electrical contact with the commutator segments, wherein the brushes rotate relative to the stator at an angular speed that is different from that of the armature and is related to said second angular speed.
Claim 7
Dependent Claim
159 words
A synchronous electrical machine operating at steady-state as a power generator or as a motor, comprising: a stator; an armature rotating relative to the stator at a first angular speed and producing an armature magnetic field rotating relative to the stator at a second angular speed that differs by a selected amount from the first angular speed; in which the armature comprises a number of windings connected to respective commutator segments and a power source supplying power to the segments in a time sequence corresponding to the second angular speed while the armature rotates at the first angular speed; in which the power source comprises a switching arrangement powering the commutator segments in a selected sequence; and in which the switching arrangement comprises brushes making electrical contact with the commutator segments, wherein the brushes rotate relative to the stator at an angular speed that is different from that of the armature and is related to said second angular speed.
Claim 8
Dependent Claim
25 words
An electrical machine as in claim 5 including a gearing arrangement between the brushes and the armature to rotate the brushes relative to the armature.
Claim 9
Independent Claim
72 words
A method of operating an electrical machine at steady-state, comprising: rotating an armature relative to a non-rotating stator at an armature angular speed; said armature having windings and producing an armature field rotating relative to a stator at a field angular speed; supplying electrical power to the armature windings in a selected sequence causing said armature angular speed and said field angular speed to differ by a selected amount at steady state.
Claim 10
Independent Claim
72 words
A method of operating an electrical machine at steady-state, comprising: rotating an armature relative to a non-rotating stator at an armature angular speed; said armature having windings and producing an armature field rotating relative to a stator at a field angular speed; supplying electrical power to the armature windings in a selected sequence causing said armature angular speed and said field angular speed to differ by a selected amount at steady state.
Claim 11
Dependent Claim
35 words
A method as in claim 7 in which said supplying comprises coupling the armature windings to a power source through an optical switching arrangement that powers the windings in said selected sequence at steady state.
Claim 12
Dependent Claim
44 words
A method as in claim 7 in which said supplying comprises coupling the armature winding to a power source through commutators that rotate at the armature speed and brushes that rotate at a different angular speed that matches the field speed at steady state.
Claim 13
Independent Claim
168 words
A method of generating electric current in which an armature and an electro-magnetic field rotate at selected different angular velocities at steady-state, comprising: rotating an armature carrying armature windings and commutator segments coupled thereto at a selected angular speed relative to a non-rotating stator carrying stator windings; transmitting electrical power to selected commutator segments in a selected sequence through a switching arrangement that is in electrical communication with said commutator segments and an electric power source; said transmitting of electrical power to said commutator segments and thus to said armature windings producing a magnetic field surrounding said armature and rotating at a selected angular speed relative to the stator and in turn producing electrical current in said stator windings; and controlling said selected sequence of transmitting electric power to the commutator segments to maintain a selected difference between the angular speed of the armature relative to the stator and the angular speed of the magnetic field produced by the armature windings relative to the stator at steady state.
Claim 14
Independent Claim
168 words
A method of generating electric current in which an armature and an electro-magnetic field rotate at selected different angular velocities at steady-state, comprising: rotating an armature carrying armature windings and commutator segments coupled thereto at a selected angular speed relative to a non-rotating stator carrying stator windings; transmitting electrical power to selected commutator segments in a selected sequence through a switching arrangement that is in electrical communication with said commutator segments and an electric power source; said transmitting of electrical power to said commutator segments and thus to said armature windings producing a magnetic field surrounding said armature and rotating at a selected angular speed relative to the stator and in turn producing electrical current in said stator windings; and controlling said selected sequence of transmitting electric power to the commutator segments to maintain a selected difference between the angular speed of the armature relative to the stator and the angular speed of the magnetic field produced by the armature windings relative to the stator at steady state.
Claim 15
Dependent Claim
57 words
A method as in claim 10 in which said controlling comprises controlling the operation of an optical coupling arrangement of light emitters and light-responsive switching elements coupled with said commutator segments, said emitters being activated in a selected sequence related to the angular speeds of the armature and the field relative to the stator at steady state.
Claim 16
Independent Claim
225 words
A method of generating electric current in which an armature and an electro-magnetic field rotate at selected different angular velocities at steady-state, comprising: rotating an armature carrying armature windings and commutator segments coupled thereto at a selected angular speed relative to a stator carrying stator windings; transmitting electrical power to selected commutator segments in a selected sequence through a switching arrangement that is in electrical communication with said commutator segments and an electric power source; said transmitting of electrical power to said commutator segments and thus to said armature windings producing a magnetic field surrounding said armature and rotating at a selected angular speed relative to the stator and in turn producing electrical current in said stator windings; and controlling said selected sequence of transmitting electric power to the commutator segments to maintain a selected difference between the angular speed of the armature relative to the stator and the angular speed of the magnetic field produced by the armature windings relative to the stator; in which said controlling comprises rotating brushes through which a source of electric power is coupled to said commutator segments at an angular speed relative to the stator differs from the angular speed of the armature relative to the stator by an amount related to the difference between the angular speeds of the armature and the field relative to the stator.
Claim 17
Independent Claim
225 words
A method of generating electric current in which an armature and an electro-magnetic field rotate at selected different angular velocities at steady-state, comprising: rotating an armature carrying armature windings and commutator segments coupled thereto at a selected angular speed relative to a stator carrying stator windings; transmitting electrical power to selected commutator segments in a selected sequence through a switching arrangement that is in electrical communication with said commutator segments and an electric power source; said transmitting of electrical power to said commutator segments and thus to said armature windings producing a magnetic field surrounding said armature and rotating at a selected angular speed relative to the stator and in turn producing electrical current in said stator windings; and controlling said selected sequence of transmitting electric power to the commutator segments to maintain a selected difference between the angular speed of the armature relative to the stator and the angular speed of the magnetic field produced by the armature windings relative to the stator; in which said controlling comprises rotating brushes through which a source of electric power is coupled to said commutator segments at an angular speed relative to the stator differs from the angular speed of the armature relative to the stator by an amount related to the difference between the angular speeds of the armature and the field relative to the stator.
Claim 18
Dependent Claim
58 words
A synchronous electrical machine comprising: a stator having stator windings; an armature having field windings and rotating relative to the stator windings at a first angular speed and producing an armature magnetic field rotating relative to the stator windings at a second angular speed that differs by a selected amount from the first angular speed at steady state.
Claim 19
Dependent Claim
58 words
A synchronous electrical machine comprising: a stator having stator windings; an armature having field windings and rotating relative to the stator windings at a first angular speed and producing an armature magnetic field rotating relative to the stator windings at a second angular speed that differs by a selected amount from the first angular speed at steady state.
Claim 20
Dependent Claim
53 words
A synchronous electrical machine as in claim 13 in which the armature comprises a number of windings connected to respective commutator segments and a power source supplying power to the segments in a time sequence corresponding to the second angular speed while the armature rotates at the first angular speed at steady state.
Claim 21
Dependent Claim
28 words
A synchronous electrical machine as in claim 14 in which the power source comprises a switching arrangement powering the commutator segments in a selected sequence at steady state.
Claim 22
Dependent Claim
48 words
A synchronous electrical machine as in claim 15 in which the switching arrangement comprises a set of light emitters energized in a selected sequence and a set of light detectors responding to energization of the light emitters to enable switching elements powering respective commutator segments at steady state.
Claim 23
Dependent Claim
50 words
A synchronous electrical machine as in claim 15 in which the switching arrangement comprises brushes making electrical contact with the commutator segments, wherein the brushes rotate relative to the stator at an angular speed that is different from that of the armature and is related to said second angular speed.
Claim 24
Dependent Claim
26 words
A synchronous electrical machine as in claim 17 including a gearing arrangement between the brushes and the armature to rotate the brushes relative to the armature.
Claim 25
Independent Claim
78 words
A method of operating an electrical machine at steady-state, comprising: rotating an armature relative to a stator at an armature angular speed; said armature having windings and producing an armature field rotating relative to the stator at a field angular speed; supplying electrical power to the armature windings in a sequence that effectively rotates the armature field at an angular speed that differs by a selected amount from the angular speed of the armature windings at steady state.
Claim 26
Independent Claim
78 words
A method of operating an electrical machine at steady-state, comprising: rotating an armature relative to a stator at an armature angular speed; said armature having windings and producing an armature field rotating relative to the stator at a field angular speed; supplying electrical power to the armature windings in a sequence that effectively rotates the armature field at an angular speed that differs by a selected amount from the angular speed of the armature windings at steady state.
Claim 27
Dependent Claim
31 words
A method as in claim 19 in which said supplying comprises coupling the armature windings to a power source through an optical switching arrangement that powers the windings in said sequence.
Claim 28
Dependent Claim
44 words
A method as in claim 19 in which said supplying comprises coupling the armature winding to a power source through commutators that rotate at the armature speed and brushes that rotate at a different angular speed that matches the field speed at steady state.
Claim 29
Dependent Claim
15 words
A method as in claim 19 in which said method comprises operating an AC machine.
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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) | 2003-04-04 | 2003-10-04 | 2004-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-04 | 2007-10-04 | 2008-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-04 | 2011-10-04 | 2012-04-04 | $7700.00 | Window Closed / Lapsed |