CN107643486A - A kind of method and apparatus of electrical fault detection - Google Patents
A kind of method and apparatus of electrical fault detection Download PDFInfo
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- CN107643486A CN107643486A CN201710898866.2A CN201710898866A CN107643486A CN 107643486 A CN107643486 A CN 107643486A CN 201710898866 A CN201710898866 A CN 201710898866A CN 107643486 A CN107643486 A CN 107643486A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/34—Testing dynamo-electric machines
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Abstract
The invention discloses a kind of method of electrical fault detection, including obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets the first preparatory condition；Wherein, first preparatory condition is continuously less than the first setting value for the absolute value of the current value of the first phase, and first phase is any one phase in three-phase；When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, second preparatory condition is continuous the second setting value, second phase and the third phase of being less than of absolute value of the second phase and the current value sum of third phase for other two-phases in three-phase in addition to first phase；When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.By the embodiment of the present invention, can have motor phase failure failure with quick detection, unmanned plane master controller is taken measures as early as possible, ensure unmanned plane safety；Moreover, the detection method that the embodiment of the present invention proposes is easy, it is easy to accomplish.
Description
Technical field
The present invention relates to technical field of motors, espespecially a kind of method and apparatus of electrical fault detection.
Background technology
For unmanned plane as airborne aircraft, it is safe and reliable most important.For the motor control of unmanned plane, if
Breaking down needs that failure situation is fed back into unmanned plane master controller in time, so that it, which is switched to fault mode, ensures unmanned plane
Safe landing.
The motor of unmanned plane is a rotating device, vibrations always be present in flight course, may result in three phase electric machine
Line connects disconnection with mainboard, causes motor open-phase fault occur.But correlation technique but lacks without effectively detection three phase electric machine
The scheme of phase.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of method and apparatus of electrical fault detection, with quick
Detect motor phase failure failure.
In order to reach the object of the invention, the invention provides a kind of method of electrical fault detection, including：Obtain three-phase electricity
Each phase sampler detects obtained current value in machine, judges whether the current value meets the first preparatory condition；Wherein, described
One preparatory condition is continuously less than the first setting value for the absolute value of the current value of the first phase, and first phase is any in three-phase
One phase；
When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, described second is pre-
If condition is continuously less than the second setting value, second phase and the 3rd for the absolute value of the second phase and the current value sum of third phase
It is mutually other two-phases in three-phase in addition to first phase；
When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
Further, the absolute value of the current value of first phase is continuously less than the first setting value, including：
The current value continuous sampling of first phase adds up N1More than secondary, the absolute value of the current value of the first phase for sampling to obtain is equal
Less than the first setting value, wherein,Wherein, TeFor the current value of the first phase in non-failure conditions next electric cycle
Absolute value is less than the duration of the first setting value, fcFor a carrier cycle.
Further, first setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min (Ip1,Ip2),
K is coefficient less than 1, Ip1Peak point current during throttle minimum for three phase electric machine, negative-phase sequence curent I when three phase electric machine brakesp2,
min(Ip1,Ip2) it is to take Ip1And Ip2Minimum value in both.
Further, the K is equal to 0.5.
Further, the absolute value of second phase and the current value sum of third phase is continuously less than the second setting value, bag
Include：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, obtained the second phase and the 3rd is sampled
The absolute value of the current value sum of phase is respectively less than the second setting value, wherein,fcFor a carrier cycle, feFor one
The individual electric cycle.
Further, second setting value is that the maximum in the absolute value of the current value of the second phase and third phase is multiplied by
5%.
In order to reach the object of the invention, the present invention also provides a kind of device of electrical fault detection, including：Including：Storage
Device, processor and storage are on a memory and the computer program that can run on a processor, it is characterised in that the processor
Following steps are realized when performing described program：
Obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets that first is pre-
If condition；Wherein, first preparatory condition for the current value of the first phase absolute value it is continuous be less than the first setting value, described the
One phase is any one phase in three-phase；
When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, described second is pre-
If condition is continuously less than the second setting value, second phase and the 3rd for the absolute value of the second phase and the current value sum of third phase
It is mutually other two-phases in three-phase in addition to the first phase；
When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
Further, also realized during the computing device described program：
The current value continuous sampling of first phase adds up N1More than secondary, judge to sample the absolute of the current value of the first obtained phase
Whether value is respectively less than the first setting value, wherein,Wherein, TeFor the first phase in non-failure conditions next electric cycle
Current value is less than the duration of the first setting value, fcFor a carrier cycle.
Further, first setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min (Ip1,Ip2),
K is coefficient less than 1, Ip1Peak point current during throttle minimum for three phase electric machine, negative-phase sequence curent I when three phase electric machine brakesp2,
min(Ip1,Ip2) it is to take Ip1And Ip2Minimum value in both.
Further, also realized during the computing device described program：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, judge obtained the second phase of sampling and
Whether the absolute value of the current value sum of third phase is respectively less than the second setting value, wherein,fcFor a carrier cycle
Phase, feFor an electric cycle.
The embodiment of the present invention includes：Obtain each phase sampler in three phase electric machine and detect obtained current value, judge the electricity
Whether flow valuve meets the first preparatory condition；Wherein, first preparatory condition is continuously small for the absolute value of the current value of the first phase
In the first setting value, first phase is any one phase in three-phase；When meeting the first preparatory condition, judge that the current value is
The second preparatory condition of no satisfaction；Wherein, second preparatory condition is the absolute value of the second phase and the current value sum of third phase
Continuous to be less than the second setting value, second phase and third phase are other two-phases in three-phase in addition to the first phase；Meet second
During preparatory condition, judge that open-phase fault occurs in the three phase electric machine.By the embodiment of the present invention, motor can be gone out with quick detection and lacked
Phase fault, for example, performing one-time detection in each carrier cycle, then it can detect motor phase failure within any one electric cycle
Failure, unmanned plane master controller is taken measures as early as possible, ensure unmanned plane safety；Moreover, what the embodiment of the present invention proposed
Detection method is easy, it is easy to accomplish.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing further understanding technical solution of the present invention, and a part for constitution instruction, with this
The embodiment of application is used to explain technical scheme together, does not form the limitation to technical solution of the present invention.
Fig. 1 is the flow chart for the method that the electrical fault of the embodiment of the present invention detects；
Fig. 2 is motor phase failure current waveform figure；
Fig. 3 is that voltage modulated involves interval division figure；
Fig. 4 is the schematic device that the electrical fault of the embodiment of the present invention detects.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Can be in the computer system of such as one group computer executable instructions the flow of accompanying drawing illustrates the step of
Perform.Also, although logical order is shown in flow charts, in some cases, can be with suitable different from herein
Sequence performs shown or described step.
It is higher with respect to multiphase disconnection probability due to during unmanned plane during flying, there is the situation of phase disconnection, so this
Inventive embodiments detect a phase current exist it is continuous too low and combine other biphase current it is continuous it is complementary by way of combine into
Row judges.
As shown in figure 1, the method for the electrical fault detection of the embodiment of the present invention, including：
Step 101, obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value is full
The first preparatory condition of foot；Wherein, first preparatory condition is continuously less than the first setting for the absolute value of the current value of the first phase
Value, first phase are any one phase in three-phase；
Wherein, the three-phase is respectively u, v, w.First phase can be any one phase in u, v, w.Second phase and third phase
For other two-phases in u, v, w in addition to the first phase.
By taking u phase phase shortages as an example (v, w phase shortage are similar), current waveform is as shown in Figure 2.Wherein 1,2,3,4 be respectively current clamp u
Phase, DAc output v, w, u phases.In figure, current clamp u, v, w phase be directly detect together (current clamp u phases are only depicted in figure,
Another two-phase is omitted), u, v, w of DAc outputs are to be presented in after calculating gained in figure.Current clamp is shown in same width figure simultaneously
Current waveform and DAc output three-phase current waveform, be in order to the result (the former) detected with instrument come to calculate gained
As a result (the latter) is verified.
In one embodiment, for the first preparatory condition, the first setting value is minimum value peak point current.
For unmanned aerial vehicle (UAV) control, when throttle is lower, current peak is smaller, it is assumed that minimum throttle is T1, measurement obtains
Peak point current is Ip1.There is situation about braking in unmanned plane, can also have small negative-phase sequence curent and assume that its size is Ip2.It is minimum
Value peak point current takes Ip1And Ip2Both middle minimum values are simultaneously multiplied by a coefficient, meet following formula：
Ip_min=K*min (Ip1,Ip2) (1)
Wherein, minimum value function min (Ip1,Ip2) it is to take Ip1And Ip2Minimum value in both, K are the coefficient less than 1, preferably
Ground, K=0.5.Above-mentioned Ip1And Ip2Be on the occasion of.
If the absolute value of any one phase current values is continuously less than minimum peak electric current (iu,v,w＜ Ip_min) continuous integration
Number is more than N1, then the first preparatory condition is met.Wherein, N1For sampling number.
For example, when u phase phase shortages, then iu＜ Ip_minContinuous integration number be more than N1, wherein, sample rate current is taken definitely
Value, makes and meets i within non-failure conditions next electric cycleu＜ Ip_minWhen a length of Te, thenWherein, fcFor one
Carrier cycle.Wherein, TeCan be rotating speed it is minimum in the case of (such as：1500rpm), measurement electric current obtains.
Step 102, when meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, institute
State the second preparatory condition for the current value sum of the second phase and third phase absolute value it is continuous be less than the second setting value, described second
Mutually and third phase is other two-phases in three-phase in addition to the first phase；
As shown in figure 3, it is state when three-phase current does not break down.Fig. 3 is by being f a cyclec(one
Carrier cycle) waveform and an electric cycle be 3fcWaveform be overlapped after obtained figure.Wherein, an electric cycle is
360 °, 12 parts are divided into, such as (0 °~30 °) section, 1 (30 °~60 °) section ... 11 (330 °~360 °) area 0 in Fig. 3
Between.Such as in 0 section, v phase current values are equal with w phase current values absolute values, symbol is opposite；In 1~2 section, v phase current values and
U phase current values absolute values are equal, symbol is opposite；In 3~4 sections, w phase current values and u phase current values absolute values are equal, symbol phase
Instead；In 5~6 sections, w phase current values and v phase current values absolute values are equal, symbol is opposite ... are not that is, occurring
During failure, possess following characteristics：
(1) there is two-phase in three-phase current synchronization absolute value is equal, symbol is opposite；
(2) it is not the relation that absolute value is equal, symbol is opposite all the time be present between fixed two-phase, but in three-phase
There is the relation that absolute value is equal, symbol is opposite within certain period between certain two-phase (alternately and regularly) --- namely
Say, above-mentioned relation, this moment, be between v phases and w phases, subsequent time becomes between v phases and u phases again, then lower a moment is again
Become between w phases and u phases ...
In order to which quick detection electric current is with the presence or absence of exception, only sentenced by taking section 0,1,2 (representing 1/4 electric cycle) as an example
It is disconnected.It is assumed that electrical fault u phases phase shortage as shown in Figure 2, that is, at section 0, the virtual value read is iv、iwIf meet
iv=-iw, namely ivAnd iwIt is equal in magnitude, symbol on the contrary, and continuous integration number be more than N2, then meet the second preparatory condition,
N2For sampling number,fcFor a carrier cycle, feFor an electric cycle.
So in the ideal case, the second preparatory condition is the absolute value company of the second phase and the current value sum of third phase
Continuous N2It is equal to 0 more than secondary.Or or：The difference of the absolute value of the current value of second phase and third phase is continuously equal to 0.And
And the current value symbol of second phase and third phase is opposite or is 0 simultaneously.
Due in sampling process, it is understood that there may be certain error, i.e., in open-phase fault, the electric current of the second phase and third phase
The absolute value of value sum may not be zero, but a less value, that is to say, that the second phase and the current value sum of third phase
Absolute value in the range of some (such as：Within 5%).So the second preparatory condition is the current value of the second phase and third phase
The continuous N of absolute value of sum2It is secondary less than the second setting value, or, second preparatory condition is the second phase and third phase
Current value absolute value difference the continuous N of absolute value2It is secondary less than the second setting value.
In one embodiment, the second setting value is：Max(|i2|,|i3|) × 5%, namely the electricity of the second phase and third phase
Maximum in the absolute value of flow valuve is multiplied by 5%, wherein, the current value of the second phase is i2, the current value of third phase is i3, Max
() is the function for taking maximum.
Step 103, when meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
Wherein, when meeting the first preparatory condition, it is believed that be to judge that motor breaks down first, when satisfaction second is pre-
If it is to further confirm that open-phase fault occur during condition.
In actual applications, motor can be preset there is open-phase fault and set flag bit as LossPhaFlg1=0；
LossPhaFlg2=0.
When judging to meet the first preparatory condition, LossPhaFlg is set1=1.
When judging to meet the second preparatory condition, LossPhaFlg2=1 is set.
Work as LossPhaFlg1=1 and LossPhaFlg2=1, it thus may determine that open-phase fault occurs in motor.
By the embodiment of the present invention, can have motor phase failure failure with quick detection, for example, performing one in each carrier cycle
Secondary detection, then motor phase failure failure can be detected within any one electric cycle, unmanned plane master controller is adopted as early as possible
Measure is taken, ensures unmanned plane safety；Moreover, the detection method that the embodiment of the present invention proposes is easy, it is easy to accomplish.
The embodiment of the present invention is applicable to the three phase electric machine of single resistance sampling, is readily applicable to the three-phase that more resistance use
Motor.
In addition, it is necessary to explanation, although the embodiment of the present invention can apply to the three phase electric machine detection of unmanned plane, not
It is limited to this, can be used for the open-phase fault detection of various three phase electric machines.
The embodiment of the present invention additionally provides a kind of device of electrical fault detection, the device be used to realizing above-described embodiment and
Embodiment, repeating no more for explanation was carried out.
The device of the electrical fault detection of the embodiment of the present invention, including：Memory, processor and storage are on a memory simultaneously
The computer program that can be run on a processor, following steps are realized during the computing device described program：
Obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets that first is pre-
If condition；Wherein, first preparatory condition for the current value of the first phase absolute value it is continuous be less than the first setting value, described the
One phase is any one phase in three-phase；
When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, described second is pre-
If condition is continuously less than the second setting value, second phase and the 3rd for the absolute value of the second phase and the current value sum of third phase
It is mutually other two-phases in three-phase in addition to the first phase；
When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
In one embodiment, also realized during the computing device described program：
The current value continuous sampling of first phase adds up N1More than secondary, judge to sample the absolute of the current value of the first obtained phase
Whether value is respectively less than the first setting value, wherein,Wherein, TeFor the first phase in non-failure conditions next electric cycle
Current value is less than the duration of the first setting value, fcFor a carrier cycle.
In one embodiment, first setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min
(Ip1,Ip2), K is coefficient less than 1, Ip1Peak point current during throttle minimum for three phase electric machine, it is anti-phase when three phase electric machine brakes
Electric current Ip2, min (Ip1,Ip2) it is to take Ip1And Ip2Minimum value in both.
In one embodiment, the K is equal to 0.5.
In one embodiment, also realized during the computing device described program：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, judge obtained the second phase of sampling and
Whether the absolute value of the current value sum of third phase is respectively less than the second setting value, wherein,fcFor a carrier cycle
Phase, feFor an electric cycle.
In one embodiment, second setting value is the maximum in the absolute value of the current value of the second phase and third phase
Value is multiplied by 5%.
By the embodiment of the present invention, can have motor phase failure failure with quick detection, for example, performing one in each carrier cycle
Secondary detection, then motor phase failure failure can be detected within any one electric cycle, unmanned plane master controller is adopted as early as possible
Measure is taken, ensures unmanned plane safety；Moreover, the detection method that the embodiment of the present invention proposes is easy, it is easy to accomplish.
The embodiment of the present invention additionally provides a kind of device of electrical fault detection, the device be used to realizing above-described embodiment and
Embodiment, repeating no more for explanation was carried out.As used below, term " module " can realize predetermined function
The combination of software and/or hardware.Although device described by following examples can be realized with software, hardware, or
The realization of the combination of software and hardware is also what may and be contemplated.
As shown in figure 4, the device that the menu of the embodiment of the present invention is shown includes：
First judge module 41, obtained current value is detected for obtaining each phase sampler in three phase electric machine, described in judgement
Whether current value meets the first preparatory condition；Wherein, first preparatory condition is continuous for the absolute value of the current value of the first phase
Less than the first setting value, first phase is any one phase in three-phase；
Second judge module 42, during for meeting the first preparatory condition, judge whether the current value meets that second is default
Condition；Wherein, second preparatory condition continuously sets for the absolute value of the second phase and the current value sum of third phase less than second
Definite value, second phase and third phase are other two-phases in addition to the first phase in three-phase；
Determining module 43, for meet the second preparatory condition when, judge that open-phase fault occurs in the three phase electric machine.
In one embodiment, first judge module 41, is further used for：
The current value continuous sampling of first phase adds up N1More than secondary, judge to sample the absolute of the current value of the first obtained phase
Whether value is respectively less than the first setting value, wherein,Wherein, TeFor the first phase in non-failure conditions next electric cycle
Current value is less than the duration of the first setting value, fcFor a carrier cycle.
In one embodiment, first setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min
(Ip1,Ip2), K is coefficient less than 1, Ip1Peak point current during throttle minimum for three phase electric machine, it is anti-phase when three phase electric machine brakes
Electric current Ip2, min (Ip1,Ip2) it is to take Ip1And Ip2Minimum value in both.
In one embodiment, the K is equal to 0.5.
In one embodiment, second judge module 42, is further used for：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, judge obtained the second phase of sampling and
Whether the absolute value of the current value sum of third phase is respectively less than the second setting value, wherein,fcFor a carrier cycle
Phase, feFor an electric cycle.
In one embodiment, second setting value is the maximum in the absolute value of the current value of the second phase and third phase
Value is multiplied by 5%.
By the embodiment of the present invention, can have motor phase failure failure with quick detection, for example, can be in any one electric cycle
Motor phase failure failure is inside detected, unmanned plane master controller is taken measures as early as possible, ensures unmanned plane safety；Moreover, this
The detection method that inventive embodiments propose is easy, it is easy to accomplish.
Embodiments of the invention additionally provide a kind of storage medium.In the present embodiment, above-mentioned storage medium can be set
It is set to the program code that storage is used to perform following steps：
S1, obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets the
One preparatory condition；Wherein, first preparatory condition is continuously less than the first setting value, institute for the absolute value of the current value of the first phase
The first phase is stated as any one phase in three-phase；
S2, when meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, described
Two preparatory conditions, which are that the absolute value of the current value sum of the second phase and third phase is continuous, is less than the second setting value, second phase with
Third phase is other two-phases in addition to the first phase in three-phase；
S3, when meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
In the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (ROM, Read-
Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc.
It is various can be with the medium of store program codes.
Example in the present embodiment may be referred to the example described in above-described embodiment and embodiment, and the present embodiment exists
This is repeated no more.
The present embodiment additionally provides a kind of device of electrical fault detection, and the device includes processor, and processor is used for real
The function of existing above-mentioned first judge module 41, the second judge module 42 and determining module 43, specifically, it performs following process：
Obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets the first preparatory condition；
Wherein, first preparatory condition is continuously less than the first setting value for the absolute value of the current value of the first phase, and first phase is
Any one phase in three-phase；When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein,
Second preparatory condition, which is that the absolute value of the current value sum of the second phase and third phase is continuous, is less than the second setting value, and described the
Two-phase and third phase are other two-phases in three-phase in addition to the first phase；When meeting the second preparatory condition, the three-phase electricity is judged
There is open-phase fault in machine.
Obviously, those skilled in the art should be understood that the module of the above-mentioned embodiment of the present invention or step can be used and led to
Computing device realizes that they can be concentrated on single computing device, or be distributed in multiple computing device institutes group
Into network on, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to they are deposited
Storage is performed by computing device in the storage device, and in some cases, can be with different from order execution institute herein
The step of showing or describing, they are either fabricated to integrated circuit modules respectively or by the multiple modules or step in them
Suddenly single integrated circuit module is fabricated to realize.So, the embodiment of the present invention is not restricted to any specific hardware and software
With reference to.
Although disclosed herein embodiment as above, described content be only readily appreciate the present invention and use
Embodiment, it is not limited to the present invention.Technical staff in any art of the present invention, taken off not departing from the present invention
On the premise of the spirit and scope of dew, any modification and change, but the present invention can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of method of electrical fault detection, including：
Obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets the first default bar
Part；Wherein, first preparatory condition is continuously less than the first setting value, first phase for the absolute value of the current value of the first phase
For any one phase in three-phase；
When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, the described second default bar
Part is continuously less than the second setting value for the absolute value of the second phase and the current value sum of third phase, and second phase and third phase are
Other two-phases in three-phase in addition to first phase；
When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
2. according to the method for claim 1, it is characterised in that the absolute value of the current value of first phase is continuously less than the
One setting value, including：
The current value continuous sampling of first phase adds up N1More than secondary, the absolute value of the current value for the first phase for sampling to obtain is respectively less than
First setting value, wherein,Wherein, TeFor in non-failure conditions next electric cycle the current value of the first phase it is absolute
Value is less than the duration of the first setting value, fcFor a carrier cycle.
3. method according to claim 1 or 2, it is characterised in that
First setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min (Ip1,Ip2), K is to be less than 1
Number, Ip1Peak point current during throttle minimum for three phase electric machine, negative-phase sequence curent I when three phase electric machine brakesp2, min (Ip1,Ip2) be
Take Ip1And Ip2Minimum value in both.
4. according to the method for claim 3, it is characterised in that
The K is equal to 0.5.
5. according to the method for claim 1, it is characterised in that second phase and the current value sum of third phase it is absolute
Value is continuously less than the second setting value, including：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, obtained the second phase and third phase are sampled
The absolute value of current value sum is respectively less than the second setting value, wherein,fcFor a carrier cycle, feFor an electricity
Cycle.
6. the method according to claim 5 or 6, it is characterised in that
Second setting value is that the maximum in the absolute value of the current value of the second phase and third phase is multiplied by 5%.
7. a kind of device of electrical fault detection, including：Including：Memory, processor and storage on a memory and can located
The computer program run on reason device, it is characterised in that realize following steps during the computing device described program：
Obtain each phase sampler in three phase electric machine and detect obtained current value, judge whether the current value meets the first default bar
Part；Wherein, first preparatory condition is continuously less than the first setting value, first phase for the absolute value of the current value of the first phase
For any one phase in three-phase；
When meeting the first preparatory condition, judge whether the current value meets the second preparatory condition；Wherein, the described second default bar
Part is continuously less than the second setting value for the absolute value of the second phase and the current value sum of third phase, and second phase and third phase are
Other two-phases in three-phase in addition to the first phase；
When meeting the second preparatory condition, judge that open-phase fault occurs in the three phase electric machine.
8. device according to claim 7, it is characterised in that also realized during the computing device described program：
The current value continuous sampling of first phase adds up N1More than secondary, judging the absolute value of the current value for the first phase that sampling obtains is
It is no to be respectively less than the first setting value, wherein,Wherein, TeFor the electric current of the first phase in non-failure conditions next electric cycle
Value is less than the duration of the first setting value, fcFor a carrier cycle.
9. the device according to claim 7 or 8, it is characterised in that
First setting value is minimum value peak point current Ip_min, wherein, Ip_min=K*min (Ip1,Ip2), K is to be less than 1
Number, Ip1Peak point current during throttle minimum for three phase electric machine, negative-phase sequence curent I when three phase electric machine brakesp2, min (Ip1,Ip2) be
Take Ip1And Ip2Minimum value in both.
10. device according to claim 7, it is characterised in that also realized during the computing device described program：
The current value continuous sampling of second phase and third phase adds up N2More than secondary, the second phase and the 3rd that sampling obtains is judged
Whether the absolute value of the current value sum of phase is respectively less than the second setting value, wherein,fcFor a carrier cycle, fe
For an electric cycle.
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