CN107367691A - A kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method - Google Patents
A kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method Download PDFInfo
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- CN107367691A CN107367691A CN201710589692.1A CN201710589692A CN107367691A CN 107367691 A CN107367691 A CN 107367691A CN 201710589692 A CN201710589692 A CN 201710589692A CN 107367691 A CN107367691 A CN 107367691A
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- Prior art keywords
- permanent magnet
- turn
- phase
- magnet synchronous
- synchronous motor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method, comprise the following steps：Preserve modulus of impedance ratio during motor normal work；In (101) two Switch State Combination in Power Systems difference sample motor three-phase windings electric currents of inverter U3 (011) and U5, the real-time modulus of impedance ratio for calculating three-phase windings；The modulus of impedance calculated in real time is compared than the motor modulus of impedance ratio with normal work, so as to judge shorted-turn fault and its failure phase.Amount of calculation of the present invention is small, inline diagnosis can be realized, and generator neutral point need not be drawn, residual voltage need not be detected, extra computing chip need not be increased, only corresponding program need to be worked out in the control chip of original durface mounted permanent magnet synchronous motor control system, improve the reliability of diagnosis, reduce the cost of diagnosis.
Description
Technical field
The invention belongs to fault diagnosis technology field, more particularly to a kind of durface mounted permanent magnet synchronous motor shorted-turn fault
Diagnostic method.
Background technology
With rare earth permanent-magnetic material, novel high-power electronic device, microprocessor and space vector pulse width modulation
The development of (Space Vector Pulse Width Module, SVPWM), durface mounted permanent magnet synchronous motor (Surface
Mounted Permanent Magnet Synchronous Motor, SPMSM) because of simple in construction, high efficiency, high power density
And the advantages that high torque density, is widely used in various fields.But the work such as vibration, temperature, humidity, pollution, overload
Environment is likely to cause Motor Stator Winding Insulation to reduce, so as to produce turn-to-turn short circuit.If it can not find and make early
Corresponding treatment measures, failure will be expanded into more serious phase fault or shorted to earth failure etc., cause motor to damage
It is bad.Therefore motor shorted-turn fault is diagnosed to be early and is given a warning, to ensureing motor safety operation and reducing economic loss
It is significant.The most frequently used method of current diagnosis durface mounted permanent magnet synchronous motor shorted-turn fault mainly has two kinds：One
Be by carrying out signal analysis to stator current, therefrom extracting fault signature to judge turn-to-turn short circuit, this method amount of calculation compared with
Greatly, it is not easy real-time diagnosis to be out of order, and the phase that is out of order can not be diagnosed；Second, by detecting fundamental wave in residual voltage and three times
The change of harmonic wave judges turn-to-turn short circuit, not only computationally intensive, and needs to draw generator neutral point.
The content of the invention
In order to overcome the shortcomings of the prior art, it is short that the present invention provides a kind of diagnosis surface-mount type permagnetic synchronous motor turn-to-turn
Road fault method, only it need to detect that the modulus of impedance ratio of three-phase windings can compared with modulus of impedance ratio under normal operating conditions in real time
Whether there is shorted-turn fault and failure phase to be diagnosed to be, not only amount of calculation is small, and need not increase hardware circuit, without
Generator neutral point is drawn, without detecting residual voltage.
Illustrate operation principle involved in the present invention below.
The durface mounted permanent magnet synchronous motor control system of three-phase windings Y-connection is as shown in figure 1, to set durface mounted permanent magnet same
Walking motor three-phase windings modulus of impedance is respectively | Za|、|Zb|、|Zc|, modulus of impedance ratio is：
K1=| Za|/|Zc| (1)
K2=| Zb|/|Zc| (2)
Assuming that surface-mount type permagnetic synchronous motor three-phase windings modulus of impedance ratio is K under normal operating conditions1nom、K2nom。
If shorted-turn fault mutually occurs in certain, its three-phase windings modulus of impedance will deviate from normal operating conditions, corresponding resistance
Anti- mould can change than also, i.e. K1≠K1nomOr K2≠K2nom。
Therefore, as long as detecting the modulus of impedance ratios of three-phase windings compared with modulus of impedance ratio under normal operating conditions just in real time
It can be diagnosed to be and shorted-turn fault and failure phase whether occur.
When using SVPWM control technologies, the on off state for defining three bridge arms of inverter is Sa、Sb、Sc, when same bridge
S when the upper bridge arm conducting of arm, lower bridge arm turn offX (x=a, b, c)=1；When the shut-off of upper bridge arm, lower bridge arm when same bridge arm turn on
SX (x=a, b, c)=0, with U=(Sa, Sb, Sc) Switch State Combination in Power Systems is represented, 6 effective Switch State Combination in Power Systems are shared, are U respectively1
(001), U2(010), U3(011), U4(100), U5(101), U6(110)。
In U3(011) during Switch State Combination in Power Systems, Sa=0, Sb=1, Sc=1, have：
Vd-Vn=| Zb|.Ib (3)
Vd-Vn=| Zc|.Ic (4)
V in formuladFor DC bus-bar voltage, VnFor machine winding neutral point voltage, Ib、IcRespectively motor B phase windings and C
The electric current of winding.
It can be obtained by formula (3), (4)
K2=Ic/Ib (5)
In U5(101) during Switch State Combination in Power Systems, Sa=1, Sb=0, Sc=1, have：
Vd-Vn=| Za|.Ia (6)
Vd-Vn=| Zc|.Ic (7)
I in formulaaFor motor A phase winding electric currents.
It can be obtained by formula (6), (7)
K1=Ic/Ia (8)
Conceived according to foregoing invention, the present invention comprises the following steps：
1st, the durface mounted permanent magnet synchronous motor winding impedance mould under normal operation is compared into K1nom、K2nomPreserve；
2nd, in SVPWM U3(011) Switch State Combination in Power Systems sampling B phase winding electric currents IbWith C phase winding electric currents Ic；
3rd, by K2=Ic/IbComputing impedance mould compares K2；
4th, in SVPWM U5(101) Switch State Combination in Power Systems sampling A phase winding electric currents IaWith C phase winding electric currents Ic；
5th, by K1=Ic/IaComputing impedance mould compares K1；
6th, K is compared1With K1nom、K2With K2nom：
If K1≠K1nom, K2=K2nom, show A phase turn-to-turn short circuits, i.e. FlagA=1；
If K1=K1nom, K2≠K2nom, show B phase turn-to-turn short circuits, i.e. FlagB=1；
If K1≠K1nom, K2≠K2nom, show C phase turn-to-turn short circuits, i.e. FlagC=1.
The beneficial effects of the invention are as follows：A kind of durface mounted permanent magnet synchronous motor shorted-turn fault side provided by the invention
Method, it need to only detect that the modulus of impedance ratios of the three-phase windings can compared with modulus of impedance ratio under normal operating conditions is diagnosed to be in real time
Whether shorted-turn fault and failure phase are occurred, and not only amount of calculation is small, and need not draw generator neutral point, without detecting zero
Sequence voltage, only need to be in original durface mounted permanent magnet synchronous motor control system without increasing extra computing chip and hardware circuit
Control chip work out corresponding program, improve the reliability of diagnosis, reduce the cost of diagnosis.
Brief description of the drawings
Fig. 1 is control system composition schematic diagram of the present invention；
Fig. 2 is interturn short-circuit failure diagnosing method flow chart of the present invention；
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
A kind of method of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing, comprises the following steps：
1st, the durface mounted permanent magnet synchronous motor winding impedance mould under normal operation is compared into K1nom、K2nomPreserve；
2nd, in SVPWM U3(011) Switch State Combination in Power Systems sampling B phase winding electric currents IbWith C phase winding electric currents Ic；
3rd, by K2=Ic/IbComputing impedance mould compares K2；
4th, in the U in SVPWM5(101) Switch State Combination in Power Systems sampling A phase winding electric currents IaWith C phase winding electric currents Ic；
5th, by K1=Ic/IaComputing impedance mould compares K1；
6th, K is compared1With K1nom、K2With K2nom：
If K1≠K1nom, K2=K2nom, show A phase turn-to-turn short circuits, i.e. FlagA=1；
If K1=K1nom, K2≠K2nom, show B phase turn-to-turn short circuits, i.e. FlagB=1；
If K1≠K1nom, K2≠K2nom, show C phase turn-to-turn short circuits, i.e. FlagC=1.
Utilize method proposed by the present invention, it is possible to achieve the on-line fault diagnosis of durface mounted permanent magnet synchronous motor.The present invention
The method of proposition need not increase extra hardware circuit, and amount of calculation is small, can not only inline diagnosis shorted-turn fault, and can be
Radiodiagnosis x failure phase, the reliability of diagnosis can be improved, effectively reduce the cost of diagnosis.
Claims (1)
1. a kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method, it is characterised in that comprise the following steps：
(1) the durface mounted permanent magnet synchronous motor winding impedance mould under normal operation is compared into K1nom、K2nomPreserve；
(2) in SVPWM U3(011) Switch State Combination in Power Systems sampling B phase winding electric currents IbWith C phase winding electric currents Ic；
(3) K is pressed2=Ic/IbComputing impedance mould compares K2；
(4) in SVPWM U5(101) Switch State Combination in Power Systems sampling A phase winding electric currents IaWith C phase winding electric currents Ic；
(5) K is pressed1=Ic/IaComputing impedance mould compares K1；
(6) K is compared1With K1nom、K2With K2nom：
If K1≠K1nom, K2=K2nom, show A phase turn-to-turn short circuits, i.e. FlagA=1；
If K1=K1nom, K2≠K2nom, show B phase turn-to-turn short circuits, i.e. FlagB=1；
If K1≠K1nom, K2≠K2nom, show C phase turn-to-turn short circuits, i.e. FlagC=1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710589692.1A CN107367691A (en) | 2017-07-07 | 2017-07-07 | A kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710589692.1A CN107367691A (en) | 2017-07-07 | 2017-07-07 | A kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method |
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| CN107367691A true CN107367691A (en) | 2017-11-21 |
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| CN201710589692.1A Withdrawn CN107367691A (en) | 2017-07-07 | 2017-07-07 | A kind of durface mounted permanent magnet synchronous motor interturn short-circuit failure diagnosing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716152A (en) * | 2019-10-09 | 2020-01-21 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Method for monitoring turn-to-turn short circuit of generator by impedance frequency spectrum |
-
2017
- 2017-07-07 CN CN201710589692.1A patent/CN107367691A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716152A (en) * | 2019-10-09 | 2020-01-21 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Method for monitoring turn-to-turn short circuit of generator by impedance frequency spectrum |
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Application publication date: 20171121 |