CN106501717A - The scarce bridge detection method of motor and device - Google Patents
The scarce bridge detection method of motor and device Download PDFInfo
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- CN106501717A CN106501717A CN201610853094.6A CN201610853094A CN106501717A CN 106501717 A CN106501717 A CN 106501717A CN 201610853094 A CN201610853094 A CN 201610853094A CN 106501717 A CN106501717 A CN 106501717A
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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
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Abstract
The invention discloses a kind of scarce bridge detection method of motor, including step：Detect the current value of each bridge of motor；According to the current value calculating current total value that each bridge is detected in preset time period；Electric current total value is compared with scarce bridge current threshold, the electric current total value of each bridge is recorded continuously less than the scarce bridge number of times for lacking bridge current threshold；When the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judge that motor lacks bridge.The invention also discloses a kind of scarce bridge testing apparatus of motor.The present invention is by detecting to the current value of each bridge in motor, and current value is processed to judge in each bridge with the presence or absence of bridge is lacked, and improves motor and lacks the accuracy that bridge judges.
Description
Technical field
A kind of the present invention relates to technical field of motors, more particularly to scarce bridge detection method and the device of motor.
Background technology
Warm swap, electrostatic and design defect etc. are all likely to result in machine winding loose contact to motor in process of production,
Motor phase failure is shown as in running.When motor is run in the case of phase shortage, a phase current is zero, and another biphase current is all
Can increase, winding temperature rising, overheated, final motor damage certainly will be caused, if unprotected device, the consequence of phase shortage is ten
Divide serious.
Current method for detecting open phase, is by obtaining the electric current of U, V, W three-phase respectively and being compared with normalized current
To detect whether phase shortage.However, motor is constituted by two bridges per phase winding, when one of bridge is damaged, still there is electric current
Circulation, it is impossible to judge there is phase shortage.Therefore, the poor accuracy of the detection method detection of current phase shortage.
The above is only used for auxiliary and understands technical scheme, does not represent and recognizes that the above is existing skill
Art.
Content of the invention
Present invention is primarily targeted at providing a kind of scarce bridge detection method of motor and device, it is intended to solve machine winding
In bridge when damaging, due to, for the phase, still having current flowing, it is impossible to accurately judge that motor whether there is asking for phase shortage
Topic.
For achieving the above object, a kind of scarce bridge detection method of motor that the present invention is provided, comprises the following steps：
Detect the current value of each bridge of motor；
According to the current value calculating current total value that each bridge is detected in preset time period；
Electric current total value is compared with scarce bridge current threshold, the electric current total value of each bridge is recorded continuously less than scarce
The scarce bridge number of times of bridge current threshold；
When the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judge that motor lacks bridge.
Preferably, the step of the current value calculating current total value detected in preset time period according to each bridge
Suddenly include：
Calculate initial current and the value of the current value detected in preset time period；
Initial current and value are amplified according to preset rules and obtain electric current total value.
Preferably, the electric current summation that electric current total value is compared with scarce bridge current threshold, each bridge is recorded
The step of value is continuously less than the scarce bridge number of times for lacking bridge current threshold includes：
Electric current total value is compared with scarce bridge current threshold；
When electric current total value is less than bridge current threshold is lacked, the scarce bridge number of times of the bridge of record is added 1；
When electric current total value is more than or equal to bridge current threshold is lacked, by the scarce bridge number of times clear 0 of the bridge of record.
Preferably, include the step of the current value of each bridge of detection motor respectively：
Detection flows through the electric current of motor U, V, W three-phase；
Using the current value in U phase currents more than 0 as bridge current value in U phases, the current value in U phase currents less than 0 is made
For bridge current value under U phases, using the current value in V phase currents more than 0 as bridge current value in V phases, 0 will be less than in V phase currents
Current value as bridge current value under V phases, using the current value in W phase currents more than 0 as bridge current value in W phases, by W phase currents
Current value less than 0 is used as bridge current value under W phases.
Preferably, methods described also includes：
In the current value that sine wave controls stage each bridge of detection motor.
Additionally, for achieving the above object, the present invention also provides a kind of scarce bridge testing apparatus of motor, including：
Detection module, for detecting the current value of each bridge of motor；
Computing module, for the current value calculating current total value detected in preset time period according to each bridge；
Comparison module, for electric current total value is compared with scarce bridge current threshold, the electric current for recording each bridge is total
The scarce bridge number of times less than scarce bridge current threshold continuous with value；
Judge module, for when the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judging that motor lacks bridge.
Preferably, the computing module includes：
Computing unit, for calculating initial current and the value of the current value detected in preset time period；
Amplifying unit, obtains electric current total value for being amplified to initial current and value according to preset rules.
Preferably, the comparison module includes：
Comparing unit, for electric current total value is compared with scarce bridge current threshold；
Recording unit, for when electric current total value is less than bridge current threshold is lacked, the scarce bridge number of times of the bridge of record being added
1；And
When electric current total value is more than or equal to bridge current threshold is lacked, by the scarce bridge number of times clear 0 of the bridge of record.
Preferably, the detection module includes：
Sampling unit, for the electric current that detection flows through motor U, V, W three-phase；
Taxon, for using in U phase currents more than 0 current value as bridge current value in U phases, will be little in U phase currents
Current value in 0 as bridge current value under U phases, using the current value in V phase currents more than 0 as bridge current value in V phases, by V phases
Current value in electric current less than 0 as bridge current value under V phases, using the current value in W phase currents more than 0 as bridge electric current in W phases
Value, using the current value in W phase currents less than 0 as bridge current value under W phases.
Preferably, the detection module, is additionally operable to the current value for controlling stage each bridge of detection motor in sine wave.
Current value of the present invention by each bridge of detection motor；Detected in preset time period according to each bridge
Current value calculating current total value；Electric current total value is compared with scarce bridge current threshold, the electric current for recording each bridge is total
The scarce bridge number of times less than scarce bridge current threshold continuous with value；When the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked,
Judge that motor lacks bridge.By detecting to the current value of each bridge in motor, and current value is processed each to judge
With the presence or absence of bridge is lacked in bridge, improve motor and lack the accuracy that bridge judges.
Description of the drawings
Fig. 1 is the schematic flow sheet of the first embodiment of the scarce bridge detection method of motor of the present invention；
Fig. 2 is the refinement schematic flow sheet of mono- embodiment of step S10 in Fig. 1；
Fig. 3 is three phase electric machine current waveform figure；
Fig. 4 is the refinement schematic flow sheet of mono- embodiment of step S20 in Fig. 1；
Fig. 5 is the refinement schematic flow sheet of mono- embodiment of step S30 in Fig. 1；
Fig. 6 is the schematic flow sheet of the second embodiment of the scarce bridge detection method of motor of the present invention；
Fig. 7 is the high-level schematic functional block diagram of the preferred embodiment of the scarce bridge testing apparatus of motor of the present invention；
Fig. 8 is the refinement high-level schematic functional block diagram of one embodiment of detection module in Fig. 7；
Fig. 9 is the refinement high-level schematic functional block diagram of one embodiment of computing module in Fig. 7；
Figure 10 is the refinement high-level schematic functional block diagram of one embodiment of comparison module in Fig. 7.
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
It should be appreciated that specific embodiment described herein is not intended to limit the present invention only in order to explain the present invention.
The present invention provides a kind of scarce bridge detection method of motor.
With reference to Fig. 1, Fig. 1 is the schematic flow sheet of the first embodiment of the scarce bridge detection method of motor of the present invention.
In one embodiment, the scarce bridge detection method of the motor includes：
Step S10, detects the current value of each bridge of motor；
Motor can be divided into direct current generator and alternating current generator by the difference of working power, and wherein alternating current generator is also divided into single-phase
Motor and three phase electric machine；One embodiment of the invention is illustrated by taking three phase electric machine as an example, and other motors are similar to, and three phase electric machine lacks one
Can mutually not start, but three phase electric machine lacks one in operation mutually to be remained to run, referred to as phase-deficient operation；In phase-deficient operation
In, as one without electric current, then separately biphase in electric current be that then heating increases for electric current increase, holds more than normal current value
Then motor will be burned out reforwarding row because overheated；Current method for detecting open phase, is the electricity by obtaining U, V, W three-phase respectively
Stream is simultaneously compared with normalized current, however, motor is constituted by two bridges per phase winding, when one of bridge is damaged, by
In for the phase, still have current flowing, if not judging there is phase shortage, motor still lack bridge operation, lack bridge operation with
The consequence of phase-deficient operation is similar；In order to improve the accuracy of detection motor phase failure/scarce bridge, the electric current to each bridge of motor
Value is detected respectively.
With reference to Fig. 2, Fig. 2 is the refinement schematic flow sheet of mono- embodiment of step S10 in Fig. 1.
Step S11, detection flow through the electric current of motor U, V, W three-phase；
Step S12, using the current value in U phase currents more than 0 as bridge current value in U phases, will be less than 0 in U phase currents
Current value as bridge current value under U phases, using the current value in V phase currents more than 0 as bridge current value in V phases, by V phase currents
Current value less than 0 as bridge current value under V phases, using the current value in W phase currents more than 0 as bridge current value in W phases, by W
Current value in phase current less than 0 is used as bridge current value under W phases.
As shown in figure 3, operating of the three phase electric machine with rotor, the current value for flowing through motor U, V, W three-phase is to be continually changing
, and be positive and negative alternate, if judging that motor whether phase shortage, the reversal value that there may be phase current are supported with phase current
It is 0 situation after disappearing, judges motor phase failure by accident, or, when there is a bridge damage, the phase still has electric current to flow through and correctly can not sentence
The situation of power machine whether phase shortage/lack bridge；One embodiment of the invention detects the electricity of each phase of motor by current sampling resistor
Flow valuve, the positive and negative situation further according to current value are divided into upper bridge current value or lower bridge current value, i.e. by the electricity in U phase currents more than 0
Flow valuve as bridge current value in U phases, using the current value in U phase currents less than 0 as bridge current value under U phases, will be big in V phase currents
Current value in 0 as bridge current value in V phases, using the current value in V phase currents less than 0 as bridge current value under V phases, by W phases
Current value in electric current more than 0 as bridge current value in W phases, using the current value in W phase currents less than 0 as bridge electric current under W phases
Value；Three-phase current is divided into six bridge electric currents to be detected respectively, analyzed and judged, can accurately judge that motor lacks bridge；When
So, can be with the current value of each bridge of direct detection.
Step S20, according to the current value calculating current total value that each bridge is detected in preset time period；
As seen from Figure 3, over time in sinusoidal wave form, the size of current value is continually changing current value, and
The size of current value is also relevant with the load of motor, non-with the False Rate that the current value that single is detected carries out lacking bridge judgement
Chang Gao, and during due to judging that motor lacks bridge, motor will be mutually out of service for lock, occurs judging the bad of generation that run well motor by accident
Affect very big, one embodiment of the invention passes through to detect (for example, in 40ms, or in 50ms etc.) in motor preset time period
Current value calculating current total value, as the basis for judging, to improve the accuracy that scarce bridge judges.
With reference to Fig. 4, Fig. 4 is the refinement schematic flow sheet of mono- embodiment of step S20 in Fig. 1.
Step S21, calculates initial current and the value of the current value detected in preset time period；
Step S22, is amplified to initial current and value according to preset rules and obtains electric current total value.
When motor lacks bridge, the bridge in scarce bridge like state is flowed through without electric current, i.e., current value is 0, and normal condition
The size of the current value that bridge is flowed through is continually changing, in order to avoid the current value that motor load is little and/or detects is less
During value, the situation for still occurring erroneous judgement with value for smaller value of current value first calculates the current value detected in preset time period
Initial current and value, initial current and value are amplified further according to preset rules and obtain electric current total value, for example, by 40ms
In the W phases for inside detecting, bridge current value is added, and obtains the initial current of bridge and value W in W phases1, then amplify the electricity for obtaining bridge in W phases
Stream total value W0；Due to being amplified process to 0, obtained is still 0, and obtain after being amplified with less initial current and value
Electric current total value is judged that can reduce False Rate, default amplification rule can have many kinds, for example, by initial current
10 are multiplied by with value and obtain electric current total value, or initial current and value are multiplied by 200 electric current is obtained divided by motor carrier frequency again
Total value etc..
Step S30, electric current total value is compared with scarce bridge current threshold, and the electric current total value for recording each bridge connects
The continuous scarce bridge number of times less than scarce bridge current threshold；
As it was previously stated, the size of current value that motor each bridge is flowed through is continually changing, if initial current and value
Electric current total value after being processed is still smaller value, judges that motor lacks with single electric current total value less than bridge current threshold is lacked
The False Rate of bridge is still higher, and the electric current total value for being in the bridge of scarce bridge like state is 0 or smaller value always, in this regard, the present invention one
By electric current total value is compared with scarce bridge current threshold, the electric current total value for recording each bridge is continuously less than embodiment
The scarce bridge number of times of scarce bridge current threshold, to improve the accuracy rate that scarce bridge judges.
With reference to Fig. 5, Fig. 5 is the refinement schematic flow sheet of mono- embodiment of step S30 in Fig. 1.
Step S31, electric current total value is compared with scarce bridge current threshold；
The scarce bridge number of times of the bridge of record, when electric current total value is less than bridge current threshold is lacked, is added 1 by step S32；
Step S33, when electric current total value is more than or equal to bridge current threshold is lacked, will be clear for the scarce bridge number of times of the bridge of record
0.
Electric current total value is compared with scarce bridge current threshold, when electric current total value is less than bridge current threshold is lacked, will
The scarce bridge number of times of the bridge of record adds 1；When electric current total value is more than or equal to bridge current threshold is lacked, lacking the bridge of record
Bridge number of times clear 0；For the bridge in bridge like state is lacked, electric current total value is respectively less than and lacks bridge current threshold, compares once so as to every, remembers
The scarce bridge number of times of the bridge of record will increase by 1 time；And the electric current total value of the bridge of normal condition is likely larger than and is likely to less than scarce
Bridge current threshold, each result of the comparison may be all different, when comparative result is that electric current total value is less than scarce bridge current threshold,
The scarce bridge number of times of the bridge of record will increase by 1 time, and work as comparative result and be more than or equal to scarce bridge current valve for electric current total value
During value, the scarce bridge number of times clear 0 of the bridge of record, the then scarce bridge number of times of the bridge of the normal condition for recording can be 0 and less numerical value
Between change.
Step S40, when the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judges that motor lacks bridge.
As it was previously stated, the scarce bridge number of times of the bridge of normal condition is likely to less numerical value occur, in order to avoid erroneous judgement, need
Arranging and lacking bridge threshold values number of times, for example, it is 10 times to lack bridge threshold values number of times, then 10 times are reached in the scarce bridge number of times for detecting a bridge
When, judge that motor lacks bridge；The determination of scarce bridge threshold values number of times is relevant with many factors, and the value for lacking bridge threshold values number of times can not be too big, with
When avoiding being implicitly present in scarce bridge, need to judge that motor lacks bridge through the long period, cause motor to lack the time mistake of bridge operation
Long further infringement motor；The value of scarce bridge threshold values number of times can not be too little, and to avoid not lacking bridge, but some bridges are continuously several just at the right time
The secondary electric current total value for obtaining is respectively less than the situation for lacking bridge current threshold and judging by accident；And the motor for different model and difference are negative
Situation of load etc. be intended to it is considered that can comprehensive many factors determine and lack bridge threshold values number of times, certainly, lacking bridge threshold values number of times can be with
Determined by empirical value；Judged by whether lacking bridge to motor each bridge, can effectively improve motor and lack bridge/lack
The accuracy rate for mutually detecting.
The present embodiment is by detecting to the current value of each bridge in motor, and current value is processed to judge
With the presence or absence of bridge is lacked in each bridge, improve motor and lack the accuracy that bridge judges.
With reference to Fig. 6, Fig. 6 is the schematic flow sheet of the second embodiment of the scarce bridge detection method of motor of the present invention.Based on upper
The first embodiment of the scarce bridge detection method of motor is stated, methods described also includes：
Step S50, in the current value that sine wave controls stage each bridge of detection motor.
The motor that operation is controlled using square wave, due to having that torque pulsation and commutation, range of application are present
Certain limitation；The motor that operation is controlled using sine wave, as electric machine phase current is sine wave, and consecutive variations, without changing
Phase current is mutated, and therefore the noise of motor operation is low；And the motor controlled to run using sine wave, prepare operation in electrical power
And rotor is not when operating, it is already possible to detect the current value of each bridge of motor；Although three phase electric machine lacks one can mutually not start,
But three phase electric machine remains to startup optimization when lacking a bridge, therefore, by controlling stage each bridge of detection motor in sine wave
Current value, just can judge that when motor not yet operates motor lacks bridge, improve the susceptiveness and motor operation of scarce bridge detection
Safety.
The present embodiment can be not yet transported in motor by the current value in sine wave control stage each bridge of detection motor
Can just judge when turning that motor lacks bridge, improve the safety of the susceptiveness and motor operation of scarce bridge detection.
Lack bridge detection scheme in order to above-mentioned motor is better described, below specific explanations will be carried out by an example.
In electric motor starting, that is, start the current value for detecting each bridge of motor, including bridge under bridge current value, U phases in U phases
Bridge current value under bridge current value and W phases in bridge current value, W phases under bridge current value, V phases in current value, V phases, by preset time period
The current value that interior (in 40ms) is detected distinguishes the initial current of each bridge of accumulation calculating and value successively, and initial current and value are multiplied by
200 obtain electric current total value divided by motor carrier frequency again, respectively obtain the electric current of bridge under the electric current total value of bridge in U phases, U phases
Bridge under the electric current total value and W phases of bridge in the electric current total value of bridge, W phases under the electric current total value of bridge, V phases in total value, V phases
Electric current total value；The electric current total value of each bridge is compared with scarce bridge current threshold respectively, the scarce bridge number of times of record is：U phases
Bridge 0 time under bridge 0 time and W phases in bridge 0 time, W phases under bridge 0 time, V phases in bridge 1 time, V phases under upper bridge 0 time, U phases；Calculate next pre-
If the electric current total value of each bridge in the time period, then the electric current total value of each bridge is compared with scarce bridge current threshold respectively,
Record scarce bridge number of times be：Bridge 0 time and W phases in bridge 0 time, W phases under bridge 1 time, V phases in bridge 0 time, V phases under bridge 0 time, U phases in U phases
Lower bridge 0 time；During motor rotation, persistently the current value of detection motor each bridge and through computing, compare record and lack
Bridge number of times, after electric current total value is compared by certain with scarce bridge current threshold, the scarce bridge number of times of record is：Bridge 20 times in U phases,
Bridge 0 time under bridge 0 time and W phases in bridge 0 time, W phases under bridge 0 time, V phases in bridge 1 time, V phases under U phases；As in U phases, the scarce bridge number of times of bridge reaches
Arrived scarce bridge threshold values number of times 20 times, then judge that motor lacks bridge, by electromechanical locks phase, makes motor power-off out of service；Further,
Scarce bridge information can also being sent, for example, note being sent to maintenance of motor personnel, in indication motor U phases, bridge lacks bridge.
The present invention further provides a kind of scarce bridge testing apparatus of motor.
High-level schematic functional block diagram with reference to the preferred embodiment of the scarce bridge testing apparatus that Fig. 7 Fig. 7 is motor of the present invention.
In one embodiment, the scarce bridge testing apparatus of the motor include：Detection module 10, computing module 20, compare mould
Block 30 and judge module 40.
The detection module 10, for detecting the current value of each bridge of motor；
Motor can be divided into direct current generator and alternating current generator by the difference of working power, and wherein alternating current generator is also divided into single-phase
Motor and three phase electric machine；One embodiment of the invention is illustrated by taking three phase electric machine as an example, and other motors are similar to, and three phase electric machine lacks one
Can mutually not start, but three phase electric machine lacks one in operation mutually to be remained to run, referred to as phase-deficient operation；In phase-deficient operation
In, as one without electric current, then separately biphase in electric current be that then heating increases for electric current increase, holds more than normal current value
Then motor will be burned out reforwarding row because overheated；Current method for detecting open phase, is the electricity by obtaining U, V, W three-phase respectively
Stream is simultaneously compared with normalized current, however, motor is constituted by two bridges per phase winding, when one of bridge is damaged, by
In for the phase, still have current flowing, if not judging there is phase shortage, motor still lack bridge operation, lack bridge operation with
The consequence of phase-deficient operation is similar；In order to improve the accuracy of detection motor phase failure/scarce bridge, the electric current to each bridge of motor
Value is detected respectively.
With reference to Fig. 8, Fig. 8 is the refinement high-level schematic functional block diagram of 10 1 embodiment of detection module in Fig. 7；The detection module
10 include：
Sampling unit 11, for the electric current that detection flows through motor U, V, W three-phase；
Taxon 12, for using in U phase currents more than 0 current value as bridge current value in U phases, by U phase currents
Current value less than 0 as bridge current value under U phases, using the current value in V phase currents more than 0 as bridge current value in V phases, by V
Current value in phase current less than 0 is as bridge current value under V phases, electric as bridge in W phases using the current value in W phase currents more than 0
Flow valuve, using the current value in W phase currents less than 0 as bridge current value under W phases.
As shown in figure 3, operating of the three phase electric machine with rotor, the current value for flowing through motor U, V, W three-phase is to be continually changing
, and be positive and negative alternate, if judging that motor whether phase shortage, the reversal value that there may be phase current are supported with phase current
It is 0 situation after disappearing, judges motor phase failure by accident, or, when there is a bridge damage, the phase still has electric current to flow through and correctly can not sentence
The situation of power machine whether phase shortage/lack bridge；One embodiment of the invention detects the electricity of each phase of motor by current sampling resistor
Flow valuve, the positive and negative situation further according to current value are divided into upper bridge current value or lower bridge current value, i.e. by the electricity in U phase currents more than 0
Flow valuve as bridge current value in U phases, using the current value in U phase currents less than 0 as bridge current value under U phases, will be big in V phase currents
Current value in 0 as bridge current value in V phases, using the current value in V phase currents less than 0 as bridge current value under V phases, by W phases
Current value in electric current more than 0 as bridge current value in W phases, using the current value in W phase currents less than 0 as bridge electric current under W phases
Value；Three-phase current is divided into six bridge electric currents to be detected respectively, analyzed and judged, can accurately judge that motor lacks bridge；When
So, can be with the current value of each bridge of direct detection.
The computing module 20, the current value calculating current for being detected in preset time period according to each bridge are total
And value；
As seen from Figure 3, over time in sinusoidal wave form, the size of current value is continually changing current value, and
The size of current value is also relevant with the load of motor, non-with the False Rate that the current value that single is detected carries out lacking bridge judgement
Chang Gao, and during due to judging that motor lacks bridge, motor will be mutually out of service for lock, occurs judging the bad of generation that run well motor by accident
Affect very big, one embodiment of the invention passes through to detect (for example, in 40ms, or in 50ms etc.) in motor preset time period
Current value calculating current total value, as the basis for judging, to improve the accuracy that scarce bridge judges.
With reference to Fig. 9, refinement high-level schematic functional block diagrams of the Fig. 9 for 20 1 embodiment of computing module in Fig. 7, the computing module
20 include：
Computing unit 21, for calculating initial current and the value of the current value detected in preset time period；
Amplifying unit 22, obtains electric current total value for being amplified to initial current and value according to preset rules.
When motor lacks bridge, the bridge in scarce bridge like state is flowed through without electric current, i.e., current value is 0, and normal condition
The size of the current value that bridge is flowed through is continually changing, in order to avoid the current value that motor load is little and/or detects is less
During value, the situation for still occurring erroneous judgement with value for smaller value of current value first calculates the current value detected in preset time period
Initial current and value, initial current and value are amplified further according to preset rules and obtain electric current total value, for example, by 40ms
In the W phases for inside detecting, bridge current value is added, and obtains the initial current of bridge and value W in W phases1, then amplify the electricity for obtaining bridge in W phases
Stream total value W0；Due to being amplified process to 0, obtained is still 0, and obtain after being amplified with less initial current and value
Electric current total value is judged that can reduce False Rate, default amplification rule can have many kinds, for example, by initial current
10 are multiplied by with value and obtain electric current total value, or initial current and value are multiplied by 200 electric current is obtained divided by motor carrier frequency again
Total value etc..
The comparison module 30, for electric current total value is compared with scarce bridge current threshold, records each bridge
Electric current total value is continuously less than the scarce bridge number of times for lacking bridge current threshold；
As it was previously stated, the size of current value that motor each bridge is flowed through is continually changing, if initial current and value
Electric current total value after being processed is still smaller value, judges that motor lacks with single electric current total value less than bridge current threshold is lacked
The False Rate of bridge is still higher, and the electric current total value for being in the bridge of scarce bridge like state is 0 or smaller value always, in this regard, the present invention one
By electric current total value is compared with scarce bridge current threshold, the electric current total value for recording each bridge is continuously less than embodiment
The scarce bridge number of times of scarce bridge current threshold, to improve the accuracy rate that scarce bridge judges.
With reference to Figure 10, Figure 10 is the refinement high-level schematic functional block diagram of 30 1 embodiment of comparison module in Fig. 7, described compares mould
Block 30 includes：
Comparing unit 31, for electric current total value is compared with scarce bridge current threshold；
Recording unit 32, for when electric current total value is less than bridge current threshold is lacked, by the scarce bridge number of times of the bridge of record
Plus 1；And
When electric current total value is more than or equal to bridge current threshold is lacked, by the scarce bridge number of times clear 0 of the bridge of record.
Electric current total value is compared with scarce bridge current threshold, when electric current total value is less than bridge current threshold is lacked, will
The scarce bridge number of times of the bridge of record adds 1；When electric current total value is more than or equal to bridge current threshold is lacked, lacking the bridge of record
Bridge number of times clear 0；For the bridge in bridge like state is lacked, electric current total value is respectively less than and lacks bridge current threshold, compares once so as to every, remembers
The scarce bridge number of times of the bridge of record will increase by 1 time；And the electric current total value of the bridge of normal condition is likely larger than and is likely to less than scarce
Bridge current threshold, each result of the comparison may be all different, when comparative result is that electric current total value is less than scarce bridge current threshold,
The scarce bridge number of times of the bridge of record will increase by 1 time, and work as comparative result and be more than or equal to scarce bridge current valve for electric current total value
During value, the scarce bridge number of times clear 0 of the bridge of record, the then scarce bridge number of times of the bridge of the normal condition for recording can be 0 and less numerical value
Between change.
The judge module 40, for when the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judging motor
Scarce bridge.
As it was previously stated, the scarce bridge number of times of the bridge of normal condition is likely to less numerical value occur, in order to avoid erroneous judgement, need
Arranging and lacking bridge threshold values number of times, for example, it is 10 times to lack bridge threshold values number of times, then 10 times are reached in the scarce bridge number of times for detecting a bridge
When, judge that motor lacks bridge；The determination of scarce bridge threshold values number of times is relevant with many factors, and the value for lacking bridge threshold values number of times can not be too big, with
When avoiding being implicitly present in scarce bridge, need to judge that motor lacks bridge through the long period, cause motor to lack the time mistake of bridge operation
Long further infringement motor；The value of scarce bridge threshold values number of times can not be too little, and to avoid not lacking bridge, but some bridges are continuously several just at the right time
The secondary electric current total value for obtaining is respectively less than the situation for lacking bridge current threshold and judging by accident；And the motor for different model and difference are negative
Situation of load etc. be intended to it is considered that can comprehensive many factors determine and lack bridge threshold values number of times, certainly, lacking bridge threshold values number of times can be with
Determined by empirical value；Judged by whether lacking bridge to motor each bridge, can effectively improve motor and lack bridge/lack
The accuracy rate for mutually detecting.
The present embodiment is by detecting to the current value of each bridge in motor, and current value is processed to judge
With the presence or absence of bridge is lacked in each bridge, improve motor and lack the accuracy that bridge judges.
Further, the detection module 10, is additionally operable to the electric current for controlling stage each bridge of detection motor in sine wave
Value.
The motor that operation is controlled using square wave, due to having that torque pulsation and commutation, range of application are present
Certain limitation；The motor that operation is controlled using sine wave, as electric machine phase current is sine wave, and consecutive variations, without changing
Phase current is mutated, and therefore the noise of motor operation is low；And the motor controlled to run using sine wave, prepare operation in electrical power
And rotor is not when operating, it is already possible to detect the current value of each bridge of motor；Although three phase electric machine lacks one can mutually not start,
But three phase electric machine remains to startup optimization when lacking a bridge, therefore, by controlling stage each bridge of detection motor in sine wave
Current value, just can judge that when motor not yet operates motor lacks bridge, improve the susceptiveness and motor operation of scarce bridge detection
Safety.
The present embodiment can be not yet transported in motor by the current value in sine wave control stage each bridge of detection motor
Can just judge when turning that motor lacks bridge, improve the safety of the susceptiveness and motor operation of scarce bridge detection.
The preferred embodiments of the present invention are these are only, the scope of the claims of the present invention is not thereby limited, every using this
Equivalent structure or equivalent flow conversion that bright description and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. the scarce bridge detection method of a kind of motor, it is characterised in that comprise the following steps：
Detect the current value of each bridge of motor；
According to the current value calculating current total value that each bridge is detected in preset time period；
Electric current total value is compared with scarce bridge current threshold, the electric current total value for recording each bridge is continuously electric less than bridge is lacked
The scarce bridge number of times of stream threshold values；
When the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judge that motor lacks bridge.
2. the scarce bridge detection method of motor as claimed in claim 1, it is characterised in that described according to each bridge when default
Between detect in section current value calculating current total value the step of include：
Calculate initial current and the value of the current value detected in preset time period；
Initial current and value are amplified according to preset rules and obtain electric current total value.
3. the scarce bridge detection method of motor as claimed in claim 2, it is characterised in that described will electric current total value and scarce bridge electricity
Stream threshold values is compared, record the electric current total value of each bridge continuously less than lack bridge current threshold scarce bridge number of times the step of wrap
Include：
Electric current total value is compared with scarce bridge current threshold；
When electric current total value is less than bridge current threshold is lacked, the scarce bridge number of times of the bridge of record is added 1；
When electric current total value is more than or equal to bridge current threshold is lacked, by the scarce bridge number of times clear 0 of the bridge of record.
4. the scarce bridge detection method of motor as claimed in claim 1, it is characterised in that described each bridge of detection motor respectively
Current value the step of include：
Detection flows through the electric current of motor U, V, W three-phase；
Using the current value in U phase currents more than 0 as bridge current value in U phases, using the current value in U phase currents less than 0 as U phases
Lower bridge current value, using the current value in V phase currents more than 0 as bridge current value in V phases, by the current value in V phase currents less than 0
As bridge current value under V phases, using the current value in W phase currents more than 0 as bridge current value in W phases, 0 will be less than in W phase currents
Current value as bridge current value under W phases.
5. the scarce bridge detection method of motor according to any one of claims 1 to 4, it is characterised in that methods described is also wrapped
Include：
In the current value that sine wave controls stage each bridge of detection motor.
6. scarce bridge testing apparatus of a kind of motor, it is characterised in that include：
Detection module, for detecting the current value of each bridge of motor；
Computing module, for the current value calculating current total value detected in preset time period according to each bridge；
Comparison module, for electric current total value is compared with scarce bridge current threshold, records the electric current total value of each bridge
The continuous scarce bridge number of times less than scarce bridge current threshold；
Judge module, for when the scarce bridge number of times of at least one bridge is more than bridge threshold values number of times is lacked, judging that motor lacks bridge.
7. scarce bridge testing apparatus of motor as claimed in claim 6, it is characterised in that the computing module includes：
Computing unit, for calculating initial current and the value of the current value detected in preset time period；
Amplifying unit, obtains electric current total value for being amplified to initial current and value according to preset rules.
8. scarce bridge testing apparatus of motor as claimed in claim 7, it is characterised in that the comparison module includes：
Comparing unit, for electric current total value is compared with scarce bridge current threshold；
Recording unit, for when electric current total value is less than bridge current threshold is lacked, adding 1 by the scarce bridge number of times of the bridge of record；And
When electric current total value is more than or equal to bridge current threshold is lacked, by the scarce bridge number of times clear 0 of the bridge of record.
9. scarce bridge testing apparatus of motor as claimed in claim 6, it is characterised in that the detection module includes：
Sampling unit, for the electric current that detection flows through motor U, V, W three-phase；
Taxon, will be less than 0 for using the current value in U phase currents more than 0 as bridge current value in U phases in U phase currents
Current value as bridge current value under U phases, using the current value in V phase currents more than 0 as bridge current value in V phases, by V phase currents
Current value less than 0 as bridge current value under V phases, using the current value in W phase currents more than 0 as bridge current value in W phases, by W
Current value in phase current less than 0 is used as bridge current value under W phases.
10. scarce bridge testing apparatus of the motor as any one of claim 6 to 9, it is characterised in that the detection mould
Block, is additionally operable to the current value for controlling stage each bridge of detection motor in sine wave.
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