US3775649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the operation of an automatically controlled synchronous machine
Assignee: Siemens AG
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Filing: 1972-06-27
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Granted: 1973-11-27
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Expires: 1992-06-27
Abstract
Abstract The operation of an automatically controlled synchronous machine is controlled by controlling the vector of the stator current circulation by means of two components which can be varied independently of each other. One of these components, namely, the torque-generating component, is always perpendicular to the axis of the rotating field, and the other, the field-generating component, always parallel to the axis of the rotating field. In a drive of this type, which is particularly well suited for a transmissionless cement mill, full torque at stand-still, starting without chatter and full utilization at rated operation are obtained.
Inventors
- 👤 K Bayer
- 👤 H Waldmann
- 👤 M Weibelzahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
H; H02; H02P; H02P21/00; H02P21/06; H02P21/10
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
120 words
A method of controlling a converter fed automatically controlled synchronous machine having a rotor and stator comprising the steps of: a. ascertaining the sine and cosine of the instantaneous angular position Beta of the rotating field axis F of the machine with respect to a stator axis system; b. providing two independently variable reference value components (IW*) and (IB*) referenced to the rotating field axis F, IW* being a component perpendicular to said axis F and IB* being a component paralLel to said axis F; and c. using the values of sine Beta and cosine Beta to transform said components IW* and IB* into components in said stator axis system to control the vector I of the stator circulation current.
Claim 2
Independent Claim
120 words
A method of controlling a converter fed automatically controlled synchronous machine having a rotor and stator comprising the steps of: a. ascertaining the sine and cosine of the instantaneous angular position Beta of the rotating field axis F of the machine with respect to a stator axis system; b. providing two independently variable reference value components (IW*) and (IB*) referenced to the rotating field axis F, IW* being a component perpendicular to said axis F and IB* being a component paralLel to said axis F; and c. using the values of sine Beta and cosine Beta to transform said components IW* and IB* into components in said stator axis system to control the vector I of the stator circulation current.
Claim 3
Dependent Claim
20 words
In a method as set forth in claim 1 wherein said two components of said rotating-field axis are ascertained directly.
Claim 4
Dependent Claim
20 words
In a method as set forth in claim 1 wherein said two components of said rotating-field axis are field simulated.
Claim 5
Dependent Claim
144 words
In a method as set forth in claim 3 the steps of determining the instantaneous position ( Alpha ) of the rotor axis and forming two orthogonal components (sin Alpha , cos Alpha ) determinitive thereof; obtaining two stator-referenced orthogonal stator current components (ia, ib); forming two rotor-referenced stator current components (id, iq) from said two orthogonal components (sin Alpha , cos Alpha ) and said two stator-referenced orthogonal stator current components (ia, ib); subsequently field simulating said rotor-referenced stator current components (id, iq) to form two rotor-referenced orthogonal field components (sin , cos ); and thereafter combining said rotor-referenced orthogonal field components (sin , cos ) and said orthogonal components (sin Alpha , cos Alpha ) determining the instantaneous position of the rotor axis to form said two components (sin Beta , cos Beta ) determining said position of the rotating-field axis (F).
Claim 6
Dependent Claim
111 words
In an apparatus for controlling a converter-fed automatically controlled synchronous machine having a rotor and a stator; at least one vector rotator for transforming two components (sin Beta , cos Beta ) determining the instantaneous angular position of the rotating-field axis (F) of the machine and two independently variable reference-value components (IW, IB) into two stator-referenced orthogonal stator current components (ia, ib), one of said stator current components being perpendicular to said axis and the other of said stator current components being parallel to said axis, said vector rotator including two summing amplifiers and four multipliers having outputs connected in pairs to a respective input of one each of said amplifiers.
Claim 7
Dependent Claim
111 words
In an apparatus for controlling a converter-fed automatically controlled synchronous machine having a rotor and a stator; at least one vector rotator for transforming two components (sin Beta , cos Beta ) determining the instantaneous angular position of the rotating-field axis (F) of the machine and two independently variable reference-value components (IW, IB) into two stator-referenced orthogonal stator current components (ia, ib), one of said stator current components being perpendicular to said axis and the other of said stator current components being parallel to said axis, said vector rotator including two summing amplifiers and four multipliers having outputs connected in pairs to a respective input of one each of said amplifiers.
Claim 8
Dependent Claim
94 words
In an apparatus as set forth in claim 5 a flux computer (5) including a pair of differential amplifiers (32, 33) and a negative feedback circuit including resistors therein connected to each said differential amplifier for field simulation said two components determining the position of said rotating-field axis; one of said amplifiers receiving a stator current component (id) disposed in the direction of the rotor axis (P) and a quantity (ie) proportional to the excitation current, and the other of said amplifiers receiving a stator current component (iq) disposed perpendicularly of the rotor axis.
Claim 9
Dependent Claim
42 words
In an apparatus as set forth in claim 6 wherein said machine has a damper winding, each said negative feedback circuit connecting an output of a respective amplifier to an input thereof and including a capacitor and a resistor therein in series.
Claim 10
Dependent Claim
74 words
In an apparatus as set forth in claim 7 wherein said flux computer further has means (36, 37, 38) for squaring and summing the output signals of each differential amplifier to produce an output signal, a threshold stage (41-43) for receiving said output signal and a pair of multipliers (34, 35) each multiplier being connected between each differential amplifier and said threshold in a second feedback circuit to receive a signal from said threshold.
Claim 11
Dependent Claim
120 words
In an apparatus as set forth in claim 8 wherein said flux computer (5) further includes a vector analyzer for receiving the output of said differential amplifiers; said vector analyzer having two quotient generators (49, 50) for producing output voltages, means (51, 52) for squaring said output voltages, means (53) for summing said squared output voltAges and comparing said summed output voltages with a constant quantity (E), and an integrating control (54) for receiving a compared voltage from said latter means, said integrating control being connected to said quotient generators to deliver an output voltage to said generators as a divisor input; and a vector rotator connected to said vector analyzer to receive said output voltages of said quotient generators.
Claim 12
Dependent Claim
114 words
In an apparatus as set forth in claim 9 wherein said flux computer (5) further has a second vector rotator (VD2) therein, a pulse disc (17) coupled to said rotor, a pulse generator (16'') connected with said pulse disc, a digitally operating three-phase generator (15) operatively connected to said pulse generator to be driven thereby, and a transformation circuit (16) connected to said three-phase generator for receiving and transforming three output voltages therefrom into said two components (sin Alpha , cos Alpha ) determining the instantaneous angular position of said rotor axis (P), said transformation circuit being connected to said second vector rotator to deliver said latter two components thereto prior to field simulation.
Claim 13
Dependent Claim
94 words
In an apparatus as set forth in claim 5 further having a transformation circuit (18) connected to said vector rotator (VD1) to receive stator-referenced current components (ia* , ib*) corresponding to field-oriented reference-value components(IW*, IB*); three phase current regulators connected to said transformation circuit to each receive an actual value input; three control units each respectively connected to one of said regulators to transfer a triggering signal from said regulator, three stator phase leads connected to said stator, and a thyristor disposed in each stator phase lead and connected to a respective control unit.
Claim 14
Dependent Claim
32 words
In an apparatus as set forth in claim 11, a speed control (56) connected to said rotor to produce a field-oriented reference value component (IW*) perpendicular to the rotating field axis (F).
Claim 15
Dependent Claim
58 words
In an apparatus as set forth in claim 12, a quotient generator (59) having a dividend input connected to said speed control, a divisor input for receiving a quantity proportional to the absolute value ( phi ) of the rotating-field vector, and an output for emitting said field-oriented reference value component (IW*) perpendicular to the rotating-field axis (F).
Claim 16
Dependent Claim
43 words
In an apparatus as set forth in claim 12, a pulse generator (16'') connected to said rotor, a frequency-voltage converter (57) connected between said pulse generator and said speed control and having an output connected to an actual-value input of said speed control.
Claim 17
Dependent Claim
37 words
In an apparatus as set forth in claim 14, a flux control (4) for controlling the rotor excitation, said flux control receiving a quantity proportional to the absolute value of the rotating-field vector as an actual value.
Claim 18
Dependent Claim
20 words
In an apparatus as set forth in claim 15, an excitation current regulator (60) subordinated to said flux control (4).
Claim 19
Dependent Claim
32 words
In an apparatus as set forth in claim 16 wherein said excitation current regulator (60) receives an input signal determining said field-oriented reference-value component (IB*) parallel to the rotating field axis (F).
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |