CN113589165A - Offline measurement method for parameters of linear induction motor - Google Patents
Offline measurement method for parameters of linear induction motor Download PDFInfo
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- CN113589165A CN113589165A CN202110796319.XA CN202110796319A CN113589165A CN 113589165 A CN113589165 A CN 113589165A CN 202110796319 A CN202110796319 A CN 202110796319A CN 113589165 A CN113589165 A CN 113589165A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a linear induction motor parameter off-line measuring method, which comprises the steps of locking a measured linear induction motor to fix the primary position of the linear induction motor, introducing voltages with different rated frequencies and amplitudes to the primary of the short-circuited measured linear induction motor to obtain a short-circuit characteristic curve, dragging the measured linear induction motor into a voltage with constant speed v, different frequencies and constant amplitude to obtain a no-load characteristic curve, and combining the short-circuit characteristic curve and the no-load characteristic curve to obtain exciting current and exciting inductance. The invention solves the problem of reduced control precision caused by obvious change of the excitation resistance and inductance of the motor along with the speed due to the side end effect of the linear induction motor.
Description
Technical Field
The invention relates to the field of linear induction motor parameter measurement, in particular to a linear induction motor parameter off-line measurement method.
Background
The linear induction motor is in the field of traction transmission, and the linear induction motor has low noise because of no intermediate transmission device; the traction force is not influenced by static friction force, and the climbing capability is strong; no mechanical contact exists, so the mechanical loss is small; the centrifugal force is avoided, the structural robustness of the motor is good, the primary and secondary horizontal separation is achieved, the heat dissipation effect is good, and the like. However, the linear structure of the existing linear induction motor causes a second-class longitudinal side end effect, and the effect causes eddy currents to be induced at the input end and the output end of the secondary side, so that the equivalent excitation inductance is changed along with the side end effect, and the problem of poor model of the linear induction motor is always troubled is caused.
For the reasons, the accurate solution of the linear motor model still has certain problems.
Disclosure of Invention
The invention provides an offline measuring method for parameters of a linear induction motor, which aims to solve the problem of inaccurate model.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an off-line measuring method for parameters of a linear induction motor is characterized by comprising the following steps:
step 3, two-phase direct current voltage is introduced into the short-circuited linear induction motor to be measured to measure current, and the primary resistance R can be obtained through a voltammetry methodsThe value of (3) is combined with the short-circuit characteristic curve and the power conservation law in the step (2) to obtain the secondary resistance RrPrimary inductance value LsσAnd secondary inductance value LrσA value of (d);
step 4, applying a constant dragging speed v to the measured linear induction motor, and introducing a sine wave with constant frequency f and amplitude to the measured linear induction motor to generate an electromagnetic thrust Fe and a braking resistance Feb;
step 5, continuously increasing the primary input frequency of the linear induction motor to be detected to ensure that the electromagnetic thrust Fe and the braking resistance Feb are equal, and recording the terminal voltage U of the second primary winding under different frequenciesk2A second primary current Ik2Second primary input power Pk2To determine the no-load characteristic curve of the measured linear induction motor;
step 6, utilizing the voltage U of the secondary primary winding terminalk2A second primary current Ik2And combining the short-circuit characteristic curve and the no-load characteristic curve to obtain the exciting current ImAnd an excitation inductance LmA value of (d);
step 7, changing the dragging speed v of the motor, repeating the steps 4 to 6, and obtaining the excitation resistance I under different speedsmAnd an excitation inductance LmThe value of (c).
Further, the primary of the linear induction motor to be detected is dragged to a preset speed through a power motor.
Further, the short-circuit characteristic curve comprises a terminal voltage U of the corresponding first primary windingk1And a first primary current Ik1The no-load characteristic curve comprises the terminal voltage U of the second primary windingk2And a second primary input power Pk2The relationship of (1).
Further, step 3 obtains a primary resistance RsThe formula for the value of (a) is: rs＝Us/IsWherein U issFor the voltage value of the linear induction motor to be measured, IsThe current value of the measured linear induction motor is obtained.
Further, step 3 obtains the secondary resistance RrThe formula for the value of (a) is: pk1＝m1Ik1 2(Rs+Rr) Wherein m is1To be measuredNumber of phases of linear induction motor.
Further, step 3 obtains the primary inductance LsσAnd a secondary inductance LrσThe formula for the value of (a) is: zk＝Uk1/Ik1，
Xk＝Xsσ+Xrσ，Xsσ＝Xrσ＝Xk/2，Xsσ＝2πfLsσ，Xrσ＝2πfLrσWherein Z iskFor the input impedance value, X, of the entire equivalent circuitkFor the inductive reactance value of the entire equivalent circuit, RkIs a primary resistance RsValue of (A), XsσRepresenting the primary inductive reactance value, X, of the measured linear induction motorrσRepresenting the secondary inductive reactance of the measured linear induction motor.
Further, the voltage U of the secondary primary winding is utilized in step 6k2A second primary current Ik2Obtaining the excitation inductance LmThe value formula of (a) is: z0＝Uk2/Ik2，
Lm＝Xm/2 π f, wherein Z0Input impedance value, R, representing an equivalent modelsRepresents the stator resistance value, R2Representing the rotor resistance value.
Further, the frequency f in step 4 has a value v/2 τ.
Has the advantages that: (1) according to the off-line measurement method for the parameters of the linear induction motor, short-circuit impedance, rotor resistance and leakage resistance of a stator and a rotor are measured through a locked rotor experiment, then sine voltage which advances in the reverse direction is injected into the measured motor at different speeds, the frequency is gradually increased, the net thrust generated by the measured motor is 0, the power of eddy current loss can be further obtained, and the size of excitation resistance and excitation inductance at the speed can be obtained. The method can solve the motor parameters at each operating speed, and can obtain higher operating efficiency and higher thrust precision.
(2) According to the off-line measuring method for the parameters of the linear induction motor, only sine voltage needs to be injected into a primary stage, and primary current and input power are detected. The method has the advantages that extra hardware cost is not needed in control, in the field of high-power traction, one vehicle comprises a plurality of power compartments, and one power compartment comprises a plurality of inverters and motors, so that the power motor for providing constant speed in the method does not need to be additionally provided, and the method is high in practicability.
(3) The off-line measurement method for the parameters of the linear induction motor provided by the invention does not depend on certain fixed motor parameters and a mathematical model for clarifying the parameter change rule, and can be used as a check standard of other models.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an off-line measurement method for parameters of a linear induction motor according to the present invention;
fig. 2 is a schematic equivalent circuit diagram of a linear induction motor according to the present invention;
FIG. 3 is a schematic structural diagram of a no-load test platform of the linear induction motor provided by the invention;
fig. 4 is an equivalent circuit diagram of a locked rotor experiment of the linear induction motor provided by the invention;
fig. 5 is an equivalent circuit diagram of a virtual no-load experiment of the linear induction motor provided by the invention.
Wherein, 1, the linear induction motor to be measured, 2, the power motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides an offline measurement method for parameters of a linear induction motor, as shown in fig. 1, which is characterized in that:
step 3, two-phase direct current voltage is introduced into the short-circuited linear induction motor to be measured to measure current, and the primary resistance R can be obtained through a voltammetry methodsAssuming equal leakage inductance of the stator and the rotor of the linear induction motor to be measured, combining the short-circuit characteristic curve in the step 2, and obtaining the secondary resistance R through power conservationrPrimary inductance LsσAnd a secondary inductance LrσA value of (d); to obtain a primary resistance RsThe formula for the value of (a) is: rs＝Us/IsWherein U issFor the voltage value of the linear induction motor to be measured, IsThe current value of the measured linear induction motor is obtained. To obtain a secondary resistance RrThe formula for the value of (a) is: pk1＝m1Ik1 2(Rs+Rr) Wherein m is1The number of the phases of the linear induction motor to be measured. To obtain a primary inductance LsσAnd a secondary inductance LrσThe formula for the value of (a) is: zk＝Uk1/Ik1，
Xk＝Xsσ+Xrσ，Xsσ＝Xrσ＝Xk/2，Xsσ＝2πfLsσ，Xrσ＝2πfLrσWherein Z iskFor the input impedance value, X, of the entire equivalent circuitkFor the inductive reactance value of the entire equivalent circuit, RkIs a primary resistance RsValue of (A), XsσRepresenting the primary inductive reactance value, X, of the measured linear induction motorrσRepresenting the secondary inductive reactance of the measured linear induction motor.
Step 4, dragging the primary side of the linear induction motor to be detected to a preset speed v through a power motor, introducing a sine wave with constant frequency f amplitude to the primary side of the linear induction motor to be detected, wherein the value of the frequency f is v/2 tau, v is the actual running speed of the linear induction motor to be detected, tau is the pole pitch of a primary winding of the linear induction motor, and the linear induction motor to be detected generates electromagnetic thrust Fe and braking resistance Feb due to end effect;
step 5, continuously increasing the primary input frequency of the measured linear induction motor to ensure that the electromagnetic thrust Fe and the braking resistance Feb are equal, the net thrust of the measured linear induction motor is zero at the moment, the power of the measured linear induction motor consumed by the resistance of the excitation branch circuit and the resistance reflecting the electromagnetic output power is equal, the measured linear induction motor is in a virtual no-load state at the moment, the slip ratio s is not equal to 0 and can be obtained from an equivalent circuit diagram 5, the braking power Peb of the measured linear induction motor is equal to the thrust power Pmec, and the second virtual no-load state under different frequencies is recordedTerminal voltage U of primary windingk2A second primary current Ik2Second primary input power Pk2To determine an idling characteristic curve of the measured linear induction motor, wherein the idling characteristic curve comprises Ik2＝f3(Uk2)，PK2＝f4(Uk2)，f3Representing the voltage U across the secondary winding in no-load conditionsk2And a second primary current Ik2Functional relationship of f4Representing the voltage U across the secondary winding in no-load conditionsk2And a second primary input power Pk2The functional relationship of (a);
step 6, utilizing the voltage U of the secondary primary winding terminalk2A second primary current Ik2And combining the short-circuit characteristic curve and the no-load characteristic curve to obtain the exciting current ImAnd an excitation inductance LmA value of (d); using terminal voltage U of the second primary windingk2A second primary current Ik2Obtaining the excitation inductance LmThe value formula of (a) is: z0＝Uk2/Ik2，
Lm＝XmZ is 2 pi f, wherein z0Input impedance value, R, representing an equivalent modelsRepresents the stator resistance value, R2Representing a rotor resistance value; combining short-circuit characteristic curve and no-load characteristic curve, measurable exciting current Im。
Step 7, changing the dragging speed of the motor, repeating the steps 4 to 6, and obtaining the excitation resistance I under different speedsmAnd an excitation inductance LmThe value of (c).
In the embodiment, the preferable scheme of the measuring method is as follows: the short-circuit characteristic curve comprises a terminal voltage U of the corresponding first primary windingk1And a first primary current Ik1The no-load characteristic curve comprises the terminal voltage U of the second primary windingk2And a second primary input power Pk2The relationship of (1).
As shown in FIG. 2, U1And I1Phase voltage and phase current, respectively, vector RsIs a primary resistance, RrIs a secondary resistance, LsσIs primary leakage inductance, LrσFor secondary leakage inductance, Rr"(v) and Lm"v" is the equivalent eddy current loss resistance and equivalent excitation inductance, respectively, whose value is related to the speed, ((1-s) Rr) The/s is an equivalent resistance R reflecting the electromagnetic output powerLValue of (A), I2Is a secondary current, ImIs the excitation current.
Fig. 3 is a schematic structural diagram of a test platform of the present invention, which is different from a conventional rotary induction motor in that the resistance and inductance values on the excitation branch of the rotary induction motor are related to the operation speed of the rotary induction motor and the structural parameters of the rotary induction motor, so that virtual no-load and short-circuit experiments need to be performed at different speeds to respectively obtain the resistance and inductance values on the excitation branch. Wherein, V represents the linear velocity that the power motor drags the whole system to, VFIn the no-load experiment, the traveling speed of the traveling wave magnetic field generated by the sine voltage introduced into the linear induction motor to be tested is gradually increased until the net thrust generated by the motor to be tested is 0.
Fig. 4 and 5 are equivalent circuit diagrams of a locked-rotor experiment of the measured linear induction motor, in the locked-rotor experiment, the slip ratio s is 1, and an excitation branch comprises Rr' (v) and Lm' (v) the rotor branch comprises LrσAnd Rr and (1-s)/s Rr. Excitation branch impedance XmFar greater than rotor branch impedance Xr. Also to be noted in the measurements: the primary linear induction motor to be measured is clamped by a mechanical device to prevent sliding under the action of thrust, the air gap distance between the primary and secondary stages is ensured to be the same as that in rated operation, the frequency of the primary linear induction motor to be measured is a rated frequency, and the amplitude of the sine wave is gradually increased until the current is close to the rated value. Because of the locked rotor, the primary and the secondary are static, the slip ratio s is close to 1, and the impedance X of the excitation branch is at the momentmFar greater than rotor branch impedance XrTherefore, the excitation branch can be omitted.
Dragging the tested motor into a constant speed through a power motor, introducing a sine wave with constant amplitude and frequency f equal to v/2 tau into the primary side of the tested motor, and enabling the generated magnetomotive force to move in a direction opposite to v. Wherein v is the actual running speed of the motor to be measured, and tau is the primary winding polar distance of the linear induction motor. The primary relative to the secondary motion speed is v, and the magnetomotive force relative to the primary motion speed is-v, so the magnetomotive force relative to the secondary motion speed is 0, and the secondary is cut without a magnetic field, so the electromagnetic thrust Fe is 0 at the time, the magnetic field exists in the space, the eddy current is generated at the input end and the output end of the primary, the edge effect exists, and the braking resistance Feb is generated by the eddy current loss of the tested motor.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An off-line measuring method for parameters of a linear induction motor is characterized by comprising the following steps:
step 1, blocking a detected linear induction motor to fix the primary position of the detected linear induction motor, so that the detected linear induction motor is short-circuited, and the size of an air gap between the primary and secondary of the detected linear induction motor is ensured to be unchanged;
step 2, introducing sinusoidal voltages with different rated frequencies and amplitudes to the primary side of the short-circuited detected linear induction motor, gradually increasing the amplitudes until the primary current reaches the rated value, and recording the voltage U at the end of the first primary winding under the voltages with different amplitudesk1A first primary current Ik1And a first primary input power Pk1To determine the short circuit characteristic curve of the measured linear induction motor;
step 3, two-phase direct current voltage is introduced into the short-circuited linear induction motor to be measured to measure current, and the primary resistance R can be obtained through a voltammetry methodsThe value of (3) is combined with the short-circuit characteristic curve and the power conservation law in the step (2) to obtain the secondary resistance RrPrimary inductance value LsσAnd secondary inductance value LrσA value of (d);
step 4, applying a constant dragging speed v to the measured linear induction motor, and introducing a sine wave with constant frequency f and amplitude to the measured linear induction motor to generate an electromagnetic thrust Fe and a braking resistance Feb;
step 5, continuously increasing the primary input frequency of the linear induction motor to be detected to ensure that the electromagnetic thrust Fe and the braking resistance Feb are equal, and recording the terminal voltage U of the second primary winding under different frequenciesk2A second primary current Ik2Second primary input power Pk2To determine the no-load characteristic curve of the measured linear induction motor;
step 6, utilizing the voltage U of the secondary primary winding terminalk2A second primary current Ik2And combining the short-circuit characteristic curve and the no-load characteristic curve to obtain the exciting current ImAnd an excitation inductance LmA value of (d);
step 7, changing the dragging speed v of the motor, repeating the steps 4 to 6, and obtaining the excitation resistance I under different speedsmAnd an excitation inductance LmThe value of (c).
2. The off-line measuring method of the parameters of the linear induction motor according to claim 1, characterized in that: and dragging the primary stage of the linear induction motor to be detected to a preset speed through a power motor.
3. The off-line measuring method of the parameters of the linear induction motor according to claim 2, characterized in that: the short-circuit characteristic curve comprises a terminal voltage U of the corresponding first primary windingk1And a first primary current Ik1The no-load characteristic curve comprises the terminal voltage U of the second primary windingk2And a second primary input power Pk2The relationship of (1).
4. The off-line measuring method of parameters of the linear induction motor according to claim 3, wherein the step 3 obtains the primary resistance RsThe formula for the value of (a) is: rs＝Us/IsWherein U issFor the voltage value of the linear induction motor to be measured，IsThe current value of the measured linear induction motor is obtained.
5. The linear induction motor parameter off-line measurement method of claim 4, wherein the secondary resistance R obtained in step 3rThe formula for the value of (a) is: pk1＝m1Ik1 2(Rs+Rr) Wherein m is1The number of the phases of the linear induction motor to be measured.
6. The off-line measurement method for parameters of the linear induction motor according to claim 5, wherein the primary inductance L obtained in the step 3sσAnd a secondary inductance LrσThe formula for the value of (a) is: zk＝Uk1/Ik1，
Xk＝Xsσ+Xrσ，Xsσ＝Xrσ＝Xk/2，Xsσ＝2πfLsσ，Xrσ＝2πfLrσWherein Z iskFor the input impedance value, X, of the entire equivalent circuitkFor the inductive reactance value of the entire equivalent circuit, RkIs a primary resistance RsValue of (A), XsσRepresenting the primary inductive reactance value, X, of the measured linear induction motorrσRepresenting the secondary inductive reactance of the measured linear induction motor.
7. The method of claim 6, wherein the second primary winding terminal voltage U is utilized in step 6k2A second primary current Ik2Obtaining the excitation inductance LmThe value formula of (a) is: z0＝Uk2/Ik2，
Lm＝Xm/2 π f, wherein Z0Input impedance value, R, representing an equivalent modelsRepresents the stator resistance value, R2Representation rotaryA sub-resistance value.
8. The method of claim 7, wherein the frequency f in step 4 is v/2 τ.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116068395A (en) * | 2023-03-07 | 2023-05-05 | 中国科学院电工研究所 | Parameter testing method of linear induction motor in static state |
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| CN111257749A (en) * | 2018-11-30 | 2020-06-09 | 华中科技大学 | Offline measurement method for parameters of linear induction motor |
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| CN1603582A (en) * | 2004-11-12 | 2005-04-06 | 宁波华液机器制造有限公司 | Hydraulic variable valve control system |
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