CN103954841A - Online detection method of resistance parameters of suspension electromagnet of middle and low speed magnetic-levitation train - Google Patents
Online detection method of resistance parameters of suspension electromagnet of middle and low speed magnetic-levitation train Download PDFInfo
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- CN103954841A CN103954841A CN201410145536.2A CN201410145536A CN103954841A CN 103954841 A CN103954841 A CN 103954841A CN 201410145536 A CN201410145536 A CN 201410145536A CN 103954841 A CN103954841 A CN 103954841A
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Abstract
The invention discloses an online detection method of resistance parameters of a suspension electromagnet of a middle and low speed magnetic-levitation train. PWM voltage is added to the suspension electromagnet in the normal operating process, wherein the duty ratio of the PWM voltage is 50% and achieves switch on before switch off; the time Tm of the electromagnet under the PWM voltage from the discharge start time to the time when current of the electromagnet drops to a current value of the PWM voltage initial time is detected; the resistance of the electromagnet is calculated on line through the Tm, positive voltage time TM in the PWM voltage, the current value I0 of the electromagnet and the voltage value Ui of the electromagnet according to the formula that R=(TM-Tm*Ui)/(TM+Tm*Ui). The online detection method can obtain the resistance parameters of the electromagnet without affecting online use of the electromagnet, and the online detection method can be applied to online state detection, parameter identification and control, and the like of the electromagnet of the middle and low speed magnetic-levitation train.
Description
Technical field
The present invention relates to low-speed maglev train levitating electromagnet resistance parameter online test method in one.
Background technology
Middle low-speed maglev train mainly adopts electromagnetic attraction to suspend, suspending power is provided by levitating electromagnet, levitating electromagnet, by producing electromagnetic attraction between electric current and track, can be stabilized on fixing suspension air gap system by the size adjustment electromagnetic force of controlling electromagnet current.
Levitating electromagnet is suspension system critical piece, needs in actual use its state to carry out on-line monitoring, fault is analyzed when judging the fault that may occur and to break down.Levitating electromagnet can equivalence think that resistance series inductance, electromagnet resistance are the key parameters of reflection electromagnet state on electrology characteristic.
Resistance parameter is the important state parameter of electromagnet, is also the Main Basis that judges electromagnet state.In the time that some fault occurs electromagnet, its resistance parameter can change, and as in the time that electromagnet is opened a way, electromagnet resistance can become infinity or very big; In the time of electromagnet short circuit, it is even zero that electromagnet resistance can diminish; In the time that turn-to-turn partial short circuit appears in electromagnet, electromagnet resistance can be worth than normality little; In the time that electromagnet connects shakiness, electromagnet resistance value can occur unstable; In the time that electromagnet temperature changes, electromagnet resistance also can change.So judge by the state to levitating electromagnet that can be online to the detection of levitating electromagnet resistance.It is very necessary that electromagnet resistance value is carried out to online detection, is the necessary means that ensures the normal work of electromagnet.
Levitating electromagnet is carried out to parameter detecting online, have certain difficulty, this difficulty is mainly the real-time of suspension system control.Middle low-speed maglev train adopts electromagnetic attraction suspension system, and this suspension system is a kind of essential time-dependent system, and system realizes system stability by the size of real-time regulating magnet electric current and suspends.Suspension system calculates electromagnet in real time according to the air gap value of electromagnet and accekeration needs electric current (target current) size, electromagnet current control produces gating pulse according to electromagnet target current and actual current, in gating pulse control suspension chopper circuit, turning on and off of switching tube realized and being regulated electromagnet current, makes actual current follow target current.In middle low-speed maglev train, the size of electromagnet current realizes by suspension chopper circuit.Because switching tube frequency of operation is limited, in the time of real work, adopt fixing switching frequency, its control signal generally adopts pulse width modulating signal (PWM) signal, and by regulating the dutycycle of pwm signal, the ON time of by-pass cock pipe in switch periods regulates electric current.The voltage that suspension chopper circuit produces electromagnet under pwm signal control is PWM voltage.Electromagnet is subject to PWM Control of Voltage, and PWM voltage needs to change according to control law in real time, makes electromagnet apply and detect voltage and detect corresponding electric current, has certain difficulty.
The present invention is by the time that electromagnet is normally worked, electromagnet voltage is inserted to the PWM voltage that dutycycle is 50%, fall after rise to the time of PWM voltage initial time current value by detecting current discharge in the discharge process of electromagnet under PWM voltage, a kind of method of calculating electromagnet resistance, this method can detect electromagnet resistance parameter online in the time of work of electromagnet.The feature of this method is to add the PWM voltage of 50% dutycycle as detecting voltage in the normal work of levitating electromagnet, the weber total value that electromagnet is subject in sense cycle is close to zero, detect voltage and substantially system is not produced to disturbance, utilize the time that discharges and recharges to calculate resistance value simultaneously, except detecting electric current and voltage, do not need outside known quantity.The inventive method can be applied to the detection of middle low-speed maglev train electromagnet presence, parameter identification and control etc.
Summary of the invention
In view of the above deficiency of prior art, the object of the invention is, low-speed maglev train levitating electromagnet resistance parameter online test method in one is provided, make it to overcome the deficiencies in the prior art.Its scheme is:
Low-speed maglev train levitating electromagnet resistance online test method in one, when being carried out on-line monitoring with the judgement fault that may occur and broken down, levitating electromagnet state provides real time data to fault analysis, comprise the following steps, in levitating electromagnet course of normal operation, adding a dutycycle is 50% first to open pulse-length modulation (PWM) voltage closing afterwards; Obtain the time T that detects electromagnet under this PWM voltage and fall back to electromagnet current from electric discharge initial time PWM voltage initial time current value
m; According to T
m, positive voltage time T in PWM voltage
m, electromagnet current I
0with magnitude of voltage U
i, according to formula
online acquisition electromagnet resistance value is also delivered to on-line fault diagnosis and adjusts follow-up performance element.
In middle low-speed maglev train, levitating electromagnet electric current, voltage ratio are higher, conventionally adopt suspension chopper circuit to control electromagnet current.Suspension chopper circuit is being operated on off state, and at work, in the time that switching tube is opened, input power charges to levitating electromagnet by switching tube, and levitating electromagnet electric current increases; In the time that switching tube turn-offs, levitating electromagnet discharges to input power by diode, and levitating electromagnet electric current reduces.By ceaselessly regulating, the turning on and off of switching tube, thus realize the adjusting of electric current.
According to circuit theory, suppose that input voltage is U
i, electromagnet inductance and resistance L, R, electromagnet output current is i
o, definition time constant is τ=L/R.
In the time of switch transistor T 1, T3 conducting, have according to circuit
solve and can obtain, electric current
wherein I
0for initial time electric current, opening the moment is time zero.Current equation, according to Taylor series expansion, is ignored to high-order term, can obtain inductive current current value within switching tube service time and be
this expression formula can think that inductance is at U
i-I
ounder R voltage, charge, concerning electromagnet, while normally work, in single switch periods, ripple current, much smaller than steady state value, can think that the interior electric current of single switch periods is I
0.
When switch transistor T 1, T3 turn-off, load is discharged to power supply, and electromagnet two ends are reverse electrical source voltage, electromagnet electric discharge, and electric current reduces, and has according to circuit
solve and can obtain
wherein I
1for turn-offing initial time electric current, the shutoff moment is time zero.Current equation is launched, ignore high-order term, can obtain inductive current within the switching tube turn-off time, current value is
this expression formula can think that inductance is at U
i+ I
1under R voltage, discharge.
When the PWM that electromagnet is applied to dutycycle 50% and first open rear pass detects when voltage, suppose that service time is 2T
m.Turn-off initial time, electric current at switching tube
within the shutoff cycle, current value is
Consider, while normally work, steady current is far longer than ripple current,
So
According to formula above, can obtain, when closing, switching tube has no progeny, and electromagnet current drops to opens initial current value (i
o(t)=I
o) time be
wherein U
i, I
o, T
mfor system can be measured or known quantity, so by measuring T
m, can obtain system resistance value
By above-mentioned analysis, in the online detection of middle low-speed maglev train levitating electromagnet resistance, be 50% first to open the pwm voltage closing afterwards by apply dutycycle in levitating electromagnet course of normal operation, fall after rise to the time T of the initial time current value of sense cycle by detecting initial time to the electric current that discharges in electric current charge and discharge process
m, according to formula
can computing system resistance value.
Detection method of the present invention, by levitating electromagnet being applied to the pwm voltage that the little dutycycle of disturbance is 50%, electromagnet is discharged and recharged, fall time of initial value after rise by detecting current discharge, by being related to computing system resistance value between duration of charging, system input voltage and output current.First this method is that levitating electromagnet is detected online, is secondly that to have adopted dutycycle be 50% first to open the pwm voltage of rear pass, is finally discharge time system to be carried out to resistance calculations by detecting.This method is applicable to on-line monitoring and parameter identification and the control etc. of middle low-speed maglev train levitating electromagnet, has monitoring rapidly accurately, to features such as system disturbance are little.
Brief description of the drawings
Fig. 1 is suspension chopper circuit figure (a) and working waveform figure (b) thereof.
The schematic diagram of duration of charging and detection time when Fig. 2 is resistance parameter detection.
Fig. 3 is the systematic schematic diagram in embodiment.
Embodiment
In the time that suspension system is normally worked, according to time interval 1s, it is 2M that Digital Circuit Control device provides width to levitating electromagnet, and dutycycle is that 50% PWM that first opens rear pass detects voltage.
At pwm pulse output initial time, Digital Circuit Control device adopts AD testing circuit to sample to system initial current detected value, records sample rate current value I, starts periodicity writing time simultaneously.In the time that PWM voltage overturns, record current time periodicity M, unison counter zero clearing, again writing time periodicity, and adopt high-speed AD sampling A/D chip to carry out high-speed real-time sampling to electromagnet current.In the time that electromagnet detection electric current equals initial current detected value I, record the current time cycle and count m.
System input voltage is sampled at pwm pulse output initial time by AD, recording sampled value is U.System output resistance is so
deliver to on-line fault diagnosis and adjust follow-up performance element.
Claims (1)
1. low-speed maglev train levitating electromagnet resistance online test method in a kind, when being carried out on-line monitoring with the judgement fault that may occur and broken down, levitating electromagnet state provides real time data to fault analysis, comprise the following steps, in levitating electromagnet course of normal operation, adding a dutycycle is 50% first to open pulse-length modulation (PWM) voltage closing afterwards; Obtain the time T that detects electromagnet under this PWM voltage and fall back to electromagnet current from electric discharge initial time PWM voltage initial time current value
m; According to T
m, positive voltage time T in PWM voltage
m, electromagnet current I
0with magnitude of voltage U
i, according to formula
online acquisition electromagnet resistance value is also delivered to on-line fault diagnosis and adjusts follow-up performance element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410145536.2A CN103954841B (en) | 2014-04-11 | 2014-04-11 | Online detection method of resistance parameters of suspension electromagnet of middle and low speed magnetic-levitation train |
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| CN201410145536.2A CN103954841B (en) | 2014-04-11 | 2014-04-11 | Online detection method of resistance parameters of suspension electromagnet of middle and low speed magnetic-levitation train |
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| CN103954841B CN103954841B (en) | 2017-01-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
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| CN102393643A (en) * | 2011-10-25 | 2012-03-28 | 中国人民解放军国防科学技术大学 | Adaptive control method for current loop of magnetic levitation system |
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2014
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| CN101652666A (en) * | 2007-04-26 | 2010-02-17 | 西门子公司 | Method for determining a parameter set describing electric parameters of a route section of a magnetic suspension railway |
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| DE102008064380A1 (en) * | 2008-12-22 | 2010-06-24 | Siemens Aktiengesellschaft | Method for sensor-less state estimation of magnetic bearing utilized for mounting rotor, involves calculating position of object relative to electromagnet based on average inductance value |
| CN102393643A (en) * | 2011-10-25 | 2012-03-28 | 中国人民解放军国防科学技术大学 | Adaptive control method for current loop of magnetic levitation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765431A (en) * | 2019-01-08 | 2019-05-17 | 科华恒盛股份有限公司 | Resistance measuring circuit, temperature sensing circuit and charging gun |
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