US3796935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the field-related regulation of asynchronous machines
Assignee: Siemens AG
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Filing: 1973-01-29
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Granted: 1974-03-12
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Expires: 1993-01-29
Abstract
Abstract An asynchronous machine is supplied with impressed stator current by an inverter in a field-related manner as disclosed in copending application Serial No. 63,073. A definite commutation sequence is achieved by utilizing a sine-cosine oscillator for cyclically driving the control paths of the inverter. The frequency of the oscillator is limited to values of one sign. An additional angle correction control eliminates the commutation error angle.
Inventors
- 👤 F Blaschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:47
CPC Classifications
H; H02; H02P; H02P21/00; H02P21/06; H02P21/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
199 words
Apparatus for the field-related regulation of the stator current vector of an asynchronous machine supplied with an impressed intermediate circuit direct current by an inverter having control paths, said apparatus having a converter control paths, an intermediate circuit current regulator connected to the control paths of the converter, and an angle switch connected to the control paths of the inverter, said apparatus comprising control current means for providing a control current having components and supplying the components of the control current to the angle switch, said control current means comprising a twophase generator having an output connected to the angle switch and an input, said two-phase generator producing a vector having a phase angle ( Beta ), a PI control having an output coupled to the input of the two-phase generator for producing an output signal for varying the frequency of the two-phase generator from a minimum, said PI control having an input, and means connected to the input of the PI control for supplying to said PI control a quantity dependent upon the difference angle between the phase angle ( Beta *) of a control vector and the phase angle of the vector produced by the two-phase generator.
Claim 2
Dependent Claim
199 words
Apparatus for the field-related regulation of the stator current vector of an asynchronous machine supplied with an impressed intermediate circuit direct current by an inverter having control paths, said apparatus having a converter control paths, an intermediate circuit current regulator connected to the control paths of the converter, and an angle switch connected to the control paths of the inverter, said apparatus comprising control current means for providing a control current having components and supplying the components of the control current to the angle switch, said control current means comprising a twophase generator having an output connected to the angle switch and an input, said two-phase generator producing a vector having a phase angle ( Beta ), a PI control having an output coupled to the input of the two-phase generator for producing an output signal for varying the frequency of the two-phase generator from a minimum, said PI control having an input, and means connected to the input of the PI control for supplying to said PI control a quantity dependent upon the difference angle between the phase angle ( Beta *) of a control vector and the phase angle of the vector produced by the two-phase generator.
Claim 3
Dependent Claim
55 words
Apparatus as claimed in claim 1, wherein the control current means further comprises limiting means connected between the PI control and the two-phase generator for unilaterally limiting the output signal of the PI control, and input means connected to the input of the two-phase generator for applying a constant bias input to the two-phase generator.
Claim 4
Dependent Claim
142 words
Apparatus as claimed in claim 1, wherein the apparatus comprises control vector means for providing the control vector and control vector component voltages and the control current means further comprises a vector rotator having inputs connected to the control vector means and to the output of the two-phase generator and outputs for producing quantities proportional to the sin and cos of the difference angle ( Beta *- Beta ), a divider having inputs connected to the outputs of the vector rotator and an output, and an arc tan function generator having an input connected to the output of the divider and an output connected to the input of the PI control, the quantities produced by the vector rotator being supplied to the divider to produce a quantity proportional to the tangent of one half the difference angle and a constant voltage (E).
Claim 5
Dependent Claim
121 words
Apparatus as claimed in claim 1, wherein the apparatus further comprises speed means having an output for producing a signal indicating the speed of the machine and the control current means further comprises a phase correction control having an input coupled to the machine and an output for producing an output signal indicating the angle position of the stator current vector, and multiplying means having an input connected to the output of the phase correction control, an input coupled to the output of the speed means and an output connected to the input of the PI control for supplying to the PI control the output signal of the phase correction control modulated by the signal indicating the speed of the machine.
Claim 6
Dependent Claim
90 words
Apparatus as claimed in claim 3, wherein the vector rotator of the current control means comprises two adding amplifiers each having inputs and an output, four multipliers each having inputs and an output connected to a corresponding input of a corresponding one of the adding amplifiers, and input means for connecting the inputs of the multipliers to the output of the control vector means and to the output of the two-phase generator to supplY the control vector component voltages and the output voltages of the two-phase generator to said multipliers.
Claim 7
Dependent Claim
121 words
Apparatus as claimed in claim 3, wherein the arc tan function generator of the current control means comprises a negative feedback amplifier having inputs, a pair of resistors having a specific resistance value connected in series circuit arrangement to an input of the amplifier, a third resistor having a higher resistance value than that of the pair of resistors connected in parallel with the series circuit arrangement, and a pair of Zener diodes connected in series circuit arrangement with opposite polarities between a common point in the connection between the pair of resistors and a point at the reference potential of the amplifier, the other input of the amplifier being connected to the point at the reference potential of the amplifier.
Claim 8
Dependent Claim
46 words
Apparatus as claimed in claim 4, wherein the control current means further comprises a threshhold element connected between the output of the speed means and the corresponding input of the multiplying means for suppressing the output signal of the phase correction control at low machine speeds.
Claim 9
Dependent Claim
111 words
Apparatus as claimed in claim 4, wherein the control current means further comprises a pair of multipliers each having an input connected to a corresponding input of the vector rotator, an input coupled to the machine and an output, an adder having a pair of inputs each connected to the output of a corresponding one of the multipliers and an output, and a divider having an input connected to the output of the adder and an output connected to the phase correction control, said multipliers, adder and divider producing a quantity proportional to the sin of the difference angle ( Beta *-62ist) between the stator current vector and the control vector.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |