CN116247994A - Method and system for off-line identification and elimination of identification error of motor rotor resistance - Google Patents
Method and system for off-line identification and elimination of identification error of motor rotor resistance Download PDFInfo
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- CN116247994A CN116247994A CN202310318506.6A CN202310318506A CN116247994A CN 116247994 A CN116247994 A CN 116247994A CN 202310318506 A CN202310318506 A CN 202310318506A CN 116247994 A CN116247994 A CN 116247994A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/16—Estimation of constants, e.g. the rotor time constant
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/12—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
Abstract
The invention belongs to the induction motor parameter identification technology, in particular to a method and a system for identifying and eliminating identification errors of motor rotor resistance offline, wherein the method comprises the following steps: establishing an asymmetric T-shaped equivalent circuit under the steady state of the asynchronous motor to obtain loop impedance when single-phase low-frequency alternating voltage is input; designing an input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through a proportional resonance controller, and outputting a duty ratio to adjust the tubular state of a power switch of a voltage type inverter so as to realize the output of required identification voltage; sampling the busbar voltage and the duty ratio of the inverter, performing fast Fourier transformation to obtain a reconstructed identification voltage, and analyzing to obtain a reconstructed identification voltage imaginary part; and calculating to obtain the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part. The invention solves the technical problem of larger identification value deviation caused by stator resistance identification error and inverter nonlinear error in the prior art.
Description
Technical Field
The invention belongs to the technical field of induction motor parameter identification, and particularly relates to a method and a system for off-line identification and identification error elimination of motor rotor resistance.
Background
In an induction motor vector control system, control parameter adjustment and control performance are both dependent on model parameters of the motor. The rotor flux linkage observation particularly needs an accurate motor rotor time constant, if the motor rotor time constant is inaccurate, the estimated flux linkage is in error, calculated slip can be shifted, the inaccurate magnetic field orientation can be directly caused, dq axis decoupling fails, the excellent speed regulation performance of vector control can be seriously reduced, and the motor can be abnormally operated and damaged when serious. Therefore, the precondition of vector control is that the motor parameters are as accurate as possible, and the rotor time constant, namely the rotor resistance and the rotor inductance, are more required to be accurately identified.
In the current offline parameter identification, single-phase alternating current is applied to an asynchronous motor to excite, the current moment output voltage is obtained according to the bus voltage and the PWM duty cycle reconstruction, and the current circuit impedance is combined to obtain an actual identification value. However, as the power device is a non-ideal device, the switching characteristic of the power device has nonlinearity, and the dead time and the switching delay time of the switching tube exist, so that a certain difference exists between the reference value added to the winding voltage and the reconstruction voltage; different inverter dead time and switching characteristic parameters are different, and the compensation universality is poor according to the different inverter dead time and switching characteristic parameters; the rotor identification process adopts high-frequency current to have skin effect, and static errors of the AC current PI controller also influence the identification accuracy of parameters.
Disclosure of Invention
The invention provides a method and a system for identifying and eliminating an identification error of a motor rotor resistor in an off-line manner, which are used for eliminating the identification error of the rotor resistor and leakage inductance caused by static errors of an PI controller used for identifying alternating current, and solving the technical problem that the existing rotor resistor has larger identification value deviation caused by the identification error of a stator resistor and nonlinear errors of an inverter.
The invention discloses a method for identifying and eliminating identification errors of motor rotor resistance offline, which comprises the following steps:
establishing an asymmetric T-shaped equivalent circuit under the steady state of an asynchronous motor to obtain theoretical data parameters of a motor system, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input;
designing an input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through a proportional resonance controller, and regulating the power switch tube state of a voltage type inverter through SVPWM output duty ratio to realize the output of required identification voltage;
sampling the busbar voltage of the inverter and the SVPWM duty ratio to obtain a reconstructed identification voltage through fast Fourier transformation, and analyzing to obtain a reconstructed identification voltage imaginary part which is not influenced by nonlinear errors of the inverter;
and calculating to obtain the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
Preferably, in an asymmetric T-type equivalent circuit in a steady state of an asynchronous motor, when a single-phase low-frequency ac voltage required for identification is input to the asynchronous motor, an excitation inductance thereof is connected in parallel with a rotor resistance, and an input loop impedance of the asynchronous motor is as follows:
wherein R is s R is the stator resistance r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance, U s I is the motor phase voltage s Is the motor phase current.
Preferably, the three-phase voltage type inverter is connected with the three-phase asynchronous motor through a plurality of power switching tubes, the power switching tubes are divided into three groups, a plurality of power switching tubes of each group of switching tubes are connected in series, the three groups of switching tubes are connected in parallel at two ends of the output voltage of the three-phase asynchronous motor, and three-phase windings of the three-phase voltage type inverter are respectively connected to the series connection nodes of the power switching tubes in the three groups of switching tubes; the phase voltage output required by identification is realized by controlling the state of the corresponding power switch tube, and the identification current is input by adopting a current closed loop PR adjustment mode.
Further preferably, the alternating current amplitude I is set A Ac current frequency f 0 The same frequency as the identification voltage, a single-phase input AC current is constructed
The input identification voltage is +.>
For input AC current->
And a current feedback value i s And (3) carrying out single-phase alternating current tracking control by adopting a proportional resonance PR controller to obtain the required identification voltage.
Preferably, the real part U of the reconstructed identification voltage re And imaginary part U im The method comprises the following steps:
U im ＝U A sinθ
wherein U is A Is the amplitude of the alternating voltage, theta is the initial phase angle of the alternating voltage, U DC Is the DC bus voltage of the inverter, T d F is the dead zone of the inverter and the delay time of a switching tube c Is the carrier frequency.
Further preferably, the virtual part U is identified by reconstruction im Amplitude I of input alternating current A And the input loop impedance imaginary part, to obtain an input loop equation:
obtaining the asymmetric T-shaped rotor resistance R r The method comprises the following steps:
wherein R is r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance f 0 Is the ac current frequency.
The system for identifying and eliminating the identification error of the motor rotor resistor in an off-line manner comprises the following modules:
the loop impedance acquisition module is used for establishing an asymmetric T-shaped equivalent circuit under the steady state of the asynchronous motor to obtain theoretical data parameters of the motor system, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input;
the identification voltage output module is used for designing input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through the proportional resonance controller, and regulating the power switch tube state of the voltage type inverter through SVPWM output duty ratio to realize the output of the required identification voltage;
the identification voltage reconstruction module is used for obtaining a reconstructed identification voltage through sampling the busbar voltage of the inverter and the SVPWM duty ratio through fast Fourier transformation, and analyzing to obtain a reconstructed identification voltage imaginary part;
and the rotor resistance identification module is used for calculating and obtaining the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
Compared with the prior art, the motor rotor resistance identification method and system do not need to consider the influence caused by stator resistance errors, inverter nonlinear errors and static errors existing in the AC current PI controller, can eliminate the identification errors of rotor resistance and leakage inductance caused by the static errors of the PI controller in the identification of the AC current, can realize more accurate rotor resistance and leakage inductance parameter identification precision, and solves the technical problem that the identification value deviation of the existing rotor resistance caused by the stator resistance identification errors and the inverter nonlinear errors is larger.
Drawings
FIG. 1 is an asymmetric T-shaped equivalent circuit diagram of an asynchronous motor in a steady state in an embodiment of the invention;
fig. 2 is a diagram showing a connection between a three-phase voltage type inverter and a three-phase asynchronous motor in an embodiment of the present invention;
fig. 3 is a schematic diagram of single-phase ac experimental control in an embodiment of the present invention.
Detailed Description
The technical scheme of the present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
Example 1
The embodiment is a method for identifying the resistance of a motor rotor offline. Firstly, establishing a steady-state asymmetric T-shaped equivalent circuit of an asynchronous motor to obtain theoretical data parameters of a motor system, wherein the method specifically comprises the following steps: phase voltage value, phase current value, stator resistance, rotor resistance, excitation inductance, leakage inductance and the like, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input; secondly, designing an input single-phase low-frequency current, replacing a PI controller by a proportional resonance controller to perform no-static-difference control on the input alternating current so as to reduce identification errors, and adjusting the output duty ratio of the SVPWM to realize the output of the required identification voltage by adjusting the power switch tube state of the voltage type inverter; finally, sampling the busbar voltage of the inverter and the SVPWM duty ratio to obtain a reconstructed identification voltage through fast Fourier transformation, and analyzing and obtaining a reconstructed identification voltage imaginary part which is not influenced by nonlinear factors of the inverter; and obtaining the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
An asymmetric T-type equivalent circuit of the asynchronous motor in steady state is shown in figure 1, R s R is the stator resistance r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance, U s I is the motor phase voltage s Is the motor phase current. When single-phase low-frequency alternating voltage required for identification is input to the asynchronous motor, the exciting inductance is connected with the rotor resistor in parallel, so that the input loop impedance of the asynchronous motor is as follows:
the imaginary part of the input impedance is known as (1):
f in 0 For the input ac voltage frequency.
The three-phase voltage type inverter is connected with the three-phase asynchronous motor as shown in fig. 2, VT1-VT6 in the diagram is a power switching tube, 6 power switching tubes are divided into three groups, two power switching tubes of each group of switching tubes are connected in series, the three groups of switching tubes are connected in parallel at two ends of the output voltage of the three-phase asynchronous motor, and three-phase windings of the three-phase voltage type inverter are respectively connected to the series connection nodes of the power switching tubes in the three groups of switching tubes; taking (a, b) phase windings as an example, the normally closed state of the power switch tube VT1 is kept, the normally open state of the power switch tubes VT2, VT3, VT4 and VT5 is kept, the voltage output required by identification can be realized by inputting an excitation pulse signal from the power switch tube VT6, only the (a, b) phase windings form a loop, only a pulsating magnetic field is generated, and no electromagnetic torque is generated. Similarly, the voltage output required by the identification of the (b, c) phase and the (a, c) phase can be realized by controlling the states of the corresponding switching tubes.
Because alternating voltage is directly injected into the asynchronous motor, current surge or overcurrent is easy to occur, and the identification current is generally input in a current closed-loop regulation mode. The principle design of unidirectional alternating current identification rotor resistance is shown in figure 3.
Taking (a, b) phase winding loops as an example, an alternating current amplitude I is set A Ac voltage amplitude U A Ac current frequency f 0 The same frequency as the identification voltage, a single-phase input AC current can be constructed
The input identification voltage is +.>
Because of the static difference of the PI controller, error-free tracking of alternating current signals cannot be realized. Based on this, the present invention inputs alternating current +.>
And a current feedback value i s Single phase ac current tracking control using proportional resonance (Proportional Resonant, PR) controllerThe regulator output is the required identification voltage. The transfer function of the proportional resonant controller is:
wherein K is p Is a proportionality coefficient, K r Is the resonance coefficient omega 0 ＝2πf 0 Is the input ac angular frequency.
On the premise of not changing stability, the resonance coefficient can be increased, so that the PR controller has better frequency selection characteristic, and the static error-free tracking of the alternating current input signal is realized.
Under the stator two-phase static coordinate system, the alpha-phase stator voltage U is made alfa To input excitation voltage, beta-phase stator voltage U beta At 0, the inter-phase line current is 0, only the phase windings (a and b) form a loop, and the corresponding duty ratio signal T is obtained after SVPWM modulation a 、T b 、T c The identification voltage output of the phase winding loops of the asynchronous motor (a) and (b) can be realized by adjusting the state of the power switch tube of the voltage type inverter.
No phase voltage sampling due to hardware circuit limitation, the DC bus voltage U is sampled DC Combining the duty cycle signals T a 、T b 、T c The approximate identification voltage can be obtained. In order to maintain synchronous calculation of current and voltage, the embodiment calculates voltage samples at the same time when the current phase is zero, and obtains output voltage through Fast Fourier Transform (FFT) calculation in one current period
The real part U of the fundamental component re And imaginary part U im As shown in the formulas (4) and (5), wherein +.>
Is the output current fundamental period.
Due to the presence of non-linear factors such as dead zone, the output voltage, which is determined by bus voltage and duty cycle ratio, can be expressed as:
u in dt (t)＝±T d f c U DC The value of the average error voltage is only dependent on the current direction and is irrelevant to the magnitude of the current amplitude; t (T) d F is the dead zone of the inverter and the delay time of a switching tube c Is the carrier frequency. Mean error voltage U is developed from Fourier series dt (t) is:
neglecting the higher harmonic with smaller proportion to obtain the real part U of the reconstructed value (i.e. the reconstructed identification voltage) of the output voltage re And imaginary part U im The method comprises the following steps:
it follows that the error voltage only affects the real part U of the reconstructed value of the output voltage re The method comprises the steps of carrying out a first treatment on the surface of the Imaginary part U of output voltage reconstruction value im Is not affected and is equal to the imaginary part of the actual output voltage. U can be considered as a result of dead-head tracking by phase voltage reconstruction and phase current s 、i s Is equivalent to
In summary, the virtual part U is identified by reconstruction im Amplitude I of input alternating current A And an imaginary input loop impedance, the input loop equation is obtained as follows:
thus obtaining the asymmetric T-shaped rotor resistance R r The method comprises the following steps:
the rotor resistances of the phases (b, c) and (a, c) can be obtained by the same method, and the average value of the rotor resistances can be obtained by adding the rotor resistances obtained by the phases (a, b), b, c) and (a, c). Leakage inductance L 1s And excitation inductance L m Can be obtained by single-phase alternating current experiments and no-load equivalent experiments.
Example 2
The embodiment and embodiment 1 are based on the same inventive concept, and provide a system for identifying and eliminating identification errors of motor rotor resistance offline, which specifically comprises the following modules:
the loop impedance acquisition module is used for establishing an asymmetric T-shaped equivalent circuit under the steady state of the asynchronous motor to obtain theoretical data parameters of the motor system, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input;
the identification voltage output module is used for designing input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through the proportional resonance controller, and regulating the power switch tube state of the voltage type inverter through SVPWM output duty ratio to realize the output of the required identification voltage;
the identification voltage reconstruction module is used for obtaining a reconstructed identification voltage through sampling the busbar voltage of the inverter and the SVPWM duty ratio through fast Fourier transformation, and analyzing to obtain a reconstructed identification voltage imaginary part;
and the rotor resistance identification module is used for calculating and obtaining the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
The foregoing modules of the present embodiment are used to implement the steps of embodiment 1, and the specific implementation process of the foregoing modules is referred to embodiment 1 and is not repeated.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (10)
1. The method for identifying and eliminating the identification error of the motor rotor resistor offline is characterized by comprising the following steps:
establishing an asymmetric T-shaped equivalent circuit under the steady state of an asynchronous motor to obtain theoretical data parameters of a motor system, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input;
designing an input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through a proportional resonance controller, and regulating the power switch tube state of a voltage type inverter through SVPWM output duty ratio to realize the output of required identification voltage;
sampling the busbar voltage of the inverter and the SVPWM duty ratio to obtain a reconstructed identification voltage through fast Fourier transformation, and analyzing to obtain a reconstructed identification voltage imaginary part which is not influenced by nonlinear errors of the inverter;
and calculating to obtain the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
2. The method for identifying and eliminating identification errors of motor rotor resistance off-line according to claim 1, wherein in an asymmetric T-type equivalent circuit in a steady state of an asynchronous motor, when a single-phase low-frequency alternating voltage required for identification is input to the asynchronous motor, an excitation inductance is connected in parallel with the rotor resistance, and an input loop impedance of the asynchronous motor is:
wherein R is s R is the stator resistance r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance, U s I is the motor phase voltage s Is the motor phase current.
3. The method for identifying and eliminating identification errors of motor rotor resistance offline according to claim 1, wherein the three-phase voltage type inverter is connected with the three-phase asynchronous motor through a plurality of power switching tubes, the power switching tubes are divided into three groups, a plurality of power switching tubes of each group of switching tubes are connected in series, the three groups of switching tubes are connected in parallel at two ends of output voltage of the three-phase asynchronous motor, and three-phase windings of the three-phase voltage type inverter are respectively connected to series nodes of the power switching tubes in the three groups of switching tubes; the phase voltage output required by identification is realized by controlling the state of the corresponding power switch tube, and the identification current is input in a current closed-loop regulation mode.
4. A method for off-line identification and elimination of identification errors of motor rotor resistance according to claim 3 and wherein the ac current amplitude I is set A Ac current frequency f 0 The same frequency as the identification voltage, a single-phase input AC current is constructed
The input identification voltage is +.>
To input alternating current
And a current feedback value i s And (3) carrying out single-phase alternating current tracking control by adopting a proportional resonance PR controller to obtain the required identification voltage.
5. The method of claim 4, wherein the transfer function of the proportional resonant controller is:
wherein K is p Is a proportionality coefficient, K r Is the resonance coefficient omega 0 ＝2πf 0 Is the input ac angular frequency.
6. The method of claim 1, wherein the real part U of the reconstructed identification voltage is re And imaginary part U im The method comprises the following steps:
U im ＝U A sinθ
wherein U is A Is the amplitude of the alternating voltage, theta is the initial phase angle of the alternating voltage, U DC Is the DC bus voltage of the inverter, T d F is the dead zone of the inverter and the delay time of a switching tube c Is the carrier frequency.
7. The method of claim 6, wherein the identification error is eliminated by reconstructing an imaginary part U of the identification voltage im Amplitude I of input alternating current A And the input loop impedance imaginary part, to obtain an input loop equation:
obtaining the asymmetric T-shaped rotor resistance R r The method comprises the following steps:
wherein R is r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance f 0 Is the ac current frequency.
8. The system for identifying and eliminating the identification error of the motor rotor resistor in an off-line manner is characterized by comprising the following modules:
the loop impedance acquisition module is used for establishing an asymmetric T-shaped equivalent circuit under the steady state of the asynchronous motor to obtain theoretical data parameters of the motor system, and analyzing to obtain loop impedance when single-phase low-frequency alternating voltage is input;
the identification voltage output module is used for designing input single-phase low-frequency current, carrying out no-static-difference control on the input alternating current through the proportional resonance controller, and regulating the power switch tube state of the voltage type inverter through SVPWM output duty ratio to realize the output of the required identification voltage;
the identification voltage reconstruction module is used for obtaining a reconstructed identification voltage through sampling the busbar voltage of the inverter and the SVPWM duty ratio through fast Fourier transformation, and analyzing to obtain a reconstructed identification voltage imaginary part;
and the rotor resistance identification module is used for calculating and obtaining the accurate identification value of the rotor resistance of the asynchronous motor according to the reconstructed identification voltage imaginary part, the input alternating current amplitude and the input loop impedance imaginary part.
9. The system for identifying and eliminating identification errors of motor rotor resistance offline according to claim 8, wherein the three-phase voltage type inverter is connected with the three-phase asynchronous motor through a plurality of power switching tubes, the power switching tubes are divided into three groups, a plurality of power switching tubes of each group of switching tubes are connected in series, the three groups of switching tubes are connected in parallel at two ends of output voltage of the three-phase asynchronous motor, and three-phase windings of the three-phase voltage type inverter are respectively connected to series nodes of the power switching tubes in the three groups of switching tubes; the phase voltage output required by identification is realized by controlling the state of the corresponding power switch tube, and the identification current is input in a current closed-loop regulation mode;
setting the amplitude I of alternating current A Ac current frequency f 0 The same frequency as the identification voltage, a single-phase input AC current is constructed
The input identification voltage is +.>
To input alternating current
And a current feedback value i s And (3) carrying out single-phase alternating current tracking control by adopting a proportional resonance PR controller to obtain the required identification voltage.
10. The system for off-line identification and elimination of identification errors of motor rotor resistance according to claim 8, wherein the real part U of the reconstructed identification voltage re And imaginary part U im The method comprises the following steps:
U im ＝U A sinθ
wherein U is A Is the amplitude of the alternating voltage, theta is the initial phase angle of the alternating voltage, U DC Is the DC bus voltage of the inverter, T d F is the dead zone of the inverter and the delay time of a switching tube c Is the carrier frequency;
by reconstructing the imaginary part U of the identification voltage im Amplitude I of input alternating current A And the input loop impedance imaginary part, to obtain an input loop equation:
obtaining an asymmetric T-shaped rotorResistor R r The method comprises the following steps:
wherein R is r Is rotor resistance, L 1s Is leakage inductance L m For exciting inductance f 0 Is the ac current frequency.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116520144A (en) * | 2023-07-04 | 2023-08-01 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
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| CN116520144A (en) * | 2023-07-04 | 2023-08-01 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
| CN116520144B (en) * | 2023-07-04 | 2023-08-29 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
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