CN104898055A - Motor state determining method and device - Google Patents
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Abstract
The invention provides a motor state determining method. When a frequency converter is used for driving a motor, the motor state determining method comprises: sampling the frequency and a current value of the output current of the frequency converter; drawing an approximate sinusoidal changing curve of the output current according to the sampled frequency and the current value of the output current; and when an abnormality (overcurrent) occurs to the output current of the frequency converter, determining the running state of the motor by determining whether the actually-measured current value of the output current is on the drawn approximate sinusoidal changing curve, and if yes, determining that the motor is in a stalling state, or if not, determining that the motor is in an overexcitation state.
Description
Technical field
The present invention relates to a kind of motor status determination methods and device, particularly relating to a kind of by carrying out sampling and analyzing to the output current of frequency converter, judging motor status determination methods and the device of the running status of motor.
Background technology
Usually, when utilization transducer drive asynchronous machine (below, referred to as motor), due to the mechanical property of the relation between the rotating speed of motor and electromagnetic torque and motor, and the reason of the equipment inertia of system etc., motor can not run normally sometimes.Now, need to adjust the parameter of frequency converter, meet the requirement of industry spot, make up the problem that some are potential, make the matching status that electric machine control system and mechanical system reach best.
When using the novel motor of transducer drive, when the reason because of above-mentioned mechanical property etc. causes frequency converter and motor Incomplete matching, there will be the situation of the output current excess current of frequency converter.The phenomenon of this excess current can cause the on-off elements such as the IGBT of frequency converter because of electric current excessive and damaged, motor also can be excessive and be burned because of exciting current etc.
In order to enable motor safely, stable, normally run, need, according to the running status of the motor when the output current excess current of frequency converter, correctly to adjust the parameter of frequency converter.When the output current excess current of frequency converter, the running status of motor generally has motor rotation blockage and motor overexcitation two kinds of situations.
When load is excessive or initiation culture is too high, motor there will be the phenomenon of stall.When stall appears in motor, because power factor during motor rotation blockage is low, locked rotor current raises rapidly, and frequency converter temperature also rises fast.Such as, when the mode controlled motor is U/F control, according to the output frequency of frequency converter, judges to take what kind of measure, namely judge to which parameter of frequency converter to regulate.Cause the output frequency of frequency converter very little (such as when load is excessive etc., for powerful motor, be less than the frequency of 5Hz) time, then think that to carry out control to motor inappropriate, the electromagnetic torque that load is driven is less than load torque, needs to increase gain of torque and carrys out starter motor.When the output frequency of frequency converter is excessive, then think and cause the revolutional slip of the stator of motor and rotor excessive (s=1) because the output frequency of frequency converter is excessive under the impact of the inertia of the rotor of electronics, make rotor cannot follow the speed of the rotating magnetic field of stator.Therefore, now need the output frequency reducing frequency converter, namely reduce the speed of the rotating magnetic field of stator, reduce revolutional slip, thus solve the stall problem of motor.
When the output frequency of frequency converter changes, the internal driving of motor also changes thereupon, thus the change of exciting current can be caused, sometimes this exciting current increases too much, and make motor occur the situation that excitation is excessively strong, the magnetic induction density of electric machine iron core no longer significantly increases, impressed voltage is higher than the rated voltage of motor, and cause motor to produce magnetic saturation, now, easily burn out motor.In this case, need the output voltage reducing frequency converter, namely reduce the voltage being applied to motor, reduce field voltage, to reduce exciting current.On the other hand, when the output frequency of frequency converter is very little, because the rate of change of frequency is very little, the electric energy that the rotary magnetic place of the stator of motor produces can not pass to rotor effectively, in this case, the back electromotive force that motor produces is very little, also motor can be caused to occur overexcitation phenomenon, now, need the acceleration time reducing frequency converter, increase the acceleration of frequency converter, motor is started fast.
As mentioned above, when utilizing transducer drive motor, if can not normally the running status of starter motor or motor occur extremely, then needing the running status according to motor (being motor rotation blockage or motor overexcitation) to select suitable solution.
But, commissioning staff due to scene is difficult to confirm simply whether the mechanical property of motor meets current duty, also be difficult to the factors such as the inertia of acquisition system, thus be difficult to the running status (namely judging that motor is for stall or is in overexcited state) judging motor accurately and timely.Therefore, the often expensive time in debugging, and, in the process of debugging, too many electric energy can be wasted, do not meet environmental protection and energy-conservation requirement.Even, the commissioning staff of some shortage commissioning experience can revise the parameter of some frequency converters blindly, causes frequency converter not mate with mechanical system, and finally causes frequency converter to damage.
Therefore, judge that the means of the running status of motor are particularly important accurately and timely.
From the angle controlled, the rotary speed information that frequency converter can obtain rotor is the important means realizing motor status judgement.The most general means that known acquisition frequency converter can obtain the rotary speed information of rotor are, motor shaft loads onto speed encoder, but, this can cause the increase of frequency converter hardware and installation and equipment and maintenance cost, and, also have restrictive condition not allow the situation of installation rate scrambler at the scene.
When there is no installation rate scrambler, need to judge motor status based on the output current of frequency converter and the electric current of motor stator.
Summary of the invention
The invention provides a kind of output current at frequency converter when producing excess current, by the curent change curve based on the sample value of output current and frequency that obtain and the near sinusoidal of drawing out, judge motor status determination methods and the device of motor status.
The invention provides a kind of motor status determination methods, it is under the state using transducer drive motor, the running status of motor is judged, it is characterized in that, comprise the following steps: the sampling step that current value and the frequency of the output current of frequency converter are sampled, according to current value and the frequency of sampled described output current, that draws the curent change curve of near sinusoidal draws step, judge the alarming step of described output current whether excess current, when being judged as that described output current is excess current in described alarming step, to the current value of sampled described output current with the comparison step that compares of the curent change curve of described near sinusoidal drawn out, according to the comparative result obtained in the comparison step, judge the determining step of the running status of motor.
In the present invention, preferably, described sampling step has: first sampling step of sampling to the frequency of described output current, to the second sampling step that the current value of described output current is sampled.
In the present invention, preferably, described first sampling step comprises: the step of being sampled by first zero crossing of zero-crossing comparator to the described output current of frequency converter, by the step that second zero crossing of zero-crossing comparator to the described output current of frequency converter is sampled, described second zero crossing is the next zero crossing of described first zero crossing, according to the sampling time of described first zero crossing and described second zero crossing, calculate the step of the frequency of described output current.
In the present invention, preferably, in described determining step, when the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out do not exceed permissible range time, be judged as that motor is in the state of stall, when the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out exceed permissible range time, be judged as that motor is in overexcitation state.
In the present invention, preferably, draw in step described, use Maclaurin formula to draw the curent change curve of the near sinusoidal of described output current.
The present invention also provides a kind of motor status judgment means, it is under the state using transducer drive motor, the running status of motor is judged, it is characterized in that, comprise: the sampling module that current value and the frequency of the output current of frequency converter are sampled, according to current value and the frequency of sampled described output current, draw the depicting module of the curent change curve of near sinusoidal, judge the alarm module of described output current whether excess current, when described alarm module is judged as that described output current is excess current, to the current value of sampled described output current with the comparison module that compares of the curent change curve of described near sinusoidal drawn out, according to the comparative result of described comparison module, judge the judge module of the running status of motor.
In the present invention, preferably, described sampling module has: first sampling module of sampling to the frequency of described output current, to the second sampling module that the current value of described output current is sampled.
In the present invention, preferably, described first sampling module comprises zero-crossing comparator, sampled by first zero crossing of described zero-crossing comparator to the described output current of frequency converter, sampled by second zero crossing of described zero-crossing comparator to the described output current of frequency converter, described second zero crossing is the next zero crossing of described first zero crossing, described first sampling module, according to the sampling time of described first zero crossing and described second zero crossing, calculates the frequency of described output current.
In the present invention, preferably, when the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out do not exceed permissible range time, described judge module is judged as that motor is in the state of stall, when the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out exceed permissible range time, described judge module is judged as that motor is in overexcitation state.
In the present invention, preferably, described describing device uses Maclaurin formula to draw the near sinusoidal change curve of described output current.
According to motor status determination methods of the present invention and device, when utilizing frequency converter starter motor, the running status of motor can be judged simply, rapidly, so that make suitable counter-measure.According to the present invention, the requirement of the debugging capability to commissioning staff can be reduced, reduce the time of debugging needed for motor and the waste of minimizing electric energy, and, reliablely and stablely can run motor, avoid frequency converter and the unnecessary damage of motor, fully realize cost-saving object.
Accompanying drawing explanation
Fig. 1 is the oscillogram schematically showing the stator current of motor under different running statuses (output current of frequency converter).
Fig. 2 is the overview flow chart of the motor status determination methods representing present embodiment.
The circuit diagram of the zero-crossing comparator that Fig. 3 uses when being the turnover of the frequency at the output current to the frequency converter sampling represented in present embodiment.
Fig. 4 is the process flow diagram that the frequency of the output current to frequency converter representing present embodiment is sampled.
Fig. 5 is the block diagram of the motor status judgment means representing present embodiment.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 is the oscillogram representing the stator current of motor under different running statuses (output current of frequency converter).
Usually, different according to the running status of motor, the output current of frequency converter and the waveform of motor stator electric current also different.As shown in Figure 1, when motor produces stall, the output current of frequency converter and motor stator electric current send to the command value of the electric current of frequency converter identical (such as with the control circuit of frequency converter, curve represented by dashed line in Fig. 1), so in this case, although the current value when value of output current runs well than motor is much larger, the waveform of the output current of frequency converter is still sinusoidal curve.On the other hand, under motor is in overexcited situation, the output current of frequency converter and the waveform of motor stator electric current be not sinusoidal curve (such as, curve indicated by the solid line in Fig. 1), particularly when magnetic saturation appears in motor, output current promptly increases, and the current value risen to when running well than motor is much larger.
Therefore, under the state using transducer drive motor, in order to judge the running status of motor, needing the waveform of the output current obtaining frequency converter, namely needing to sample to the current value of the output current of frequency converter and frequency.In the present embodiment, by comparing with actual output current the curent change curve based on the sample value of output current and frequency that obtain and the near sinusoidal of drawing out, judge that motor is in any state.
The invention provides a kind of under the state using transducer drive motor, to the motor status determination methods that the running status of motor judges.Below, this electrode condition determination methods is described in detail.Fig. 2 is the overview flow chart of the motor status determination methods representing present embodiment.
First, (step S1) is sampled to the frequency of the output current of frequency converter.A variety of mode is had to the sampling of output current, in the present embodiment, to frequency converter (such as, utilize the IP5A that LG manufactures) the sampling carried out of the frequency of output current, be utilize the zero crossing of hardware circuit zero-crossing comparator to the output current of frequency converter shown in Fig. 3 to sample to realize, but be not limited thereto.Only need in this way to sample to the time of output current when zero crossing, so when motor occurs abnormal, can sample to electric current rapidly at short notice, save the time of process owing to adopting.
Fig. 4 is the process flow diagram that the frequency of the output current to frequency converter representing present embodiment is sampled.As shown in Figure 4, in step ST2, detect a zero crossing t1 of the output current of frequency converter, such as, output current becomes the time point being less than 0, in step ST3 from being greater than 0, detect the next zero crossing t2 of output current, such as, output current becomes from being less than 0 the time point being greater than 0.Then, in step ST4, calculated the cycle of output current roughly by t1, t2, output current cycle=(t2-t1) × 2, thus calculate the frequency f of output current.
Then, return Fig. 2, in step s 2, (only sample in three-phase current, such as, sample to the electric current I u of U phase) is sampled to the current value of the output current of frequency converter.Can be undertaken by general current sensor or current sampling circuit the detection that the current value of output current carries out, such as, intrinsic for detecting the current sampling circuit of output current value to detect output current value in the IP5A frequency converter that LG can be adopted to manufacture.The time interval of sampling to the current value of output current decides in the cycle of output current by determining in step sl, such as, sampling time interval Δ x can be set as: sampling time interval Δ x=output current cycle/n(such as, n=40, namely 40 sampled points are got in one-period), thus calculate the frequency f s of sampling, utilize the current value I of this frequency f s to output current to sample.
After the current value I of output current obtaining frequency converter and frequency f, draw the curent change curve (step S3) of near sinusoidal.The method of drawing the curent change curve of near sinusoidal has a variety of, at this, the simple and quick method of preferred seletion calculation is carried out such as, in the present embodiment, used the theory of infinite series, specifically, the present invention uses the Maclaurin formula saving computing time to represent sample rate current, when phase theta=0 °, order
then
Wherein, Im is the peak value (obtaining this output current maximal value in the above-mentioned step S2 sampled to current value) of output current, ω is angular velocity (being calculated by known formula ω=2 π f), in addition, according to the requirement to the precision calculated and speed, suitably determine the value of m, such as m=4.
Draw in the method for curent change curve of near sinusoidal at above-mentioned application Maclaurin formula, directly the peak I m of actual output current is sampled, but be not limited thereto, can not directly sample to the peak value of actual output current, but the current peak of the curent change curve of Schilling near sinusoidal is 1, thereby, it is possible to infer the current value corresponding with each sampled point in current period on the curent change curve that current peak is the near sinusoidal of 1.In this case, can to certain sampled point (such as, first sampled point) measured current value sample, by this measured current value divided by inferring that value that the current value corresponding with this sampled point on the curent change curve that current peak is the near sinusoidal of 1 obtains is assumed to the peak value of this output current, then, draw as the curent change curve judging the near sinusoidal of the state of the output current of actual frequency converter described later based on this peak value and frequency.
Then, the overcurrent protection function of the output current of frequency converter (, referred to as OCS function) is utilized to detect output current whether abnormal (step S4) below.When the OCS function of frequency converter does not detect output current excess current, turn back to the process of step S1.When namely the OCS function warning of frequency converter detects output current excess current, advance to the process of step S5.
Then, according to the current curve of the near sinusoidal of drawing out in step s3, judge the reason of output current (motor stator electric current) excess current causing frequency converter, namely judge that motor is in stall or is in overexcited state.In step s 5, the current value of the near-sinusoidal drawn out according to current peak and the frequency of sampled current period with each sampled point in current period is compared, when the difference at the current value of sampled point and the current value of corresponding with this sampled point on drawn near-sinusoidal is in permissible range, think that the waveform of output current of frequency converter is identical with the curent change curve of drawn near sinusoidal, be namely judged as that motor is in locked rotor condition.When exceeding permissible range at the current value of sampled point with the difference of the current value of corresponding with this sampled point on drawn near-sinusoidal, thinking and not drop on the curent change curve with drawn near sinusoidal at the output current of the frequency converter of this sampled point.
Specifically, the measured current value of certain sampled point xi in current period is set to Iu(xi), the measured current value of the next sampled point xi+1 at this sampled point is set to Iu(xi+1), according to amplitude and the frequency of the output current of the reality of current period, the near-sinusoidal utilizing Maclaurin formula to draw out is I(xi in the expression formula of sampled point xi), then this near-sinusoidal is I ' (xi) at the tangent slope of current sampling point xi, because the time interval Δ x of two (sampled point xi and next sampled point xi+1) sampled points is very little (such as, output current cycle/40), so (in fact the slope of the straight line thought through oversampled points xi and next sampled point xi+1 is similar to, be slightly less than) the above-mentioned tangent slope I ' (xi) of sampled point xi.Therefore, can pass through at the tangent slope I ' (xi) of sampled point xi and the measured current value Iu(xi at sampled point xi) and sampling time interval Δ x, infer the roughly current value Ic(xi+1 corresponding with next sampled point xi+1 on near-sinusoidal), Ic(xi+1)=Iu(xi)+I ' (xi) × Δ x.By to this current value Ic(xi+1) with the measured current value Iu(xi+1 at next sampled point xi+1) compare, judge that whether the waveform of the actual output current of frequency converter identical with the curent change curve of drawn near sinusoidal.
When motor produces stall, the waveform of the output current of frequency converter and the curent change Similar Broken Line (absolute value of actual current value is slightly less than the absolute value inferring the current value according to near-sinusoidal) of above-mentioned near sinusoidal, therefore, when to the measured current value Iu(xi+1 at next sampled point xi+1) with the current value Ic(xi+1 corresponding with this next sampled point xi+1 on drawn near-sinusoidal) result that compares is Iu(xi+1)-Ic(xi+1)≤allowable value and | Iu(xi+1) |≤| Ic(xi+1) |, be judged as that motor is in the state (step S6) of stall.
When motor is in overexcitation state, the output current of frequency converter can not drop on the near-sinusoidal drawn out according to peak value and the frequency of sampled output current, and the rate of change that actual output current increases is greater than the rate of change of the curent change curve of near sinusoidal.Therefore, when to the measured current value Iu(xi+1 at next sampled point xi+1) with the current value Ic(xi+1 corresponding with this next sampled point xi+1 on drawn near-sinusoidal) result that compares is Iu(xi+1)-Ic(xi+1) > allowable value, be judged as that motor is in overexcited state (step S7).
Thus, when the output current excess current of the OCS function warning of frequency converter and frequency converter, by the way the running status of motor is judged, can confirm to need which parameter to frequency converter to adjust, to meet the requirement of industry spot.
In addition, the present invention also provides a kind of under the state using transducer drive motor, to the motor status judgment means that the running status of motor judges, below, is described this motor status judgment means.Fig. 5 is the block diagram of the motor status judgment means representing present embodiment.
Motor status judgment means comprises: sampling module 11, and its frequency for the output current to frequency converter and current value are sampled; Depicting module 12, after its current value at the output current of sampling module 11 pairs of frequency converters and frequency are sampled, based on according to the current peak of sampled current period and frequency, draws the curent change curve of near sinusoidal; Alarm module 13, it detects output current whether excess current, is equivalent to the overcurrent protection function module of the output current of frequency converter; Comparison module 14, it is when alarm module 13 is judged as output current excess current, compares with the current value of each sampled point in current period the near-sinusoidal that depicting module 12 is drawn out; Judge module 15, it judges the running status of motor according to the comparative result of comparison module 14, namely judges that motor is in the state of stall or is in overexcited state.
In addition, as shown in Figure 5, sampling module 11 can also comprise the first sampling module 111 and the second sampling module 112.Wherein, first sampling module 111 is used for sampling to the frequency f of the output current of frequency converter, specifically, the hardware circuit zero-crossing comparator shown in Fig. 3 can be adopted to be used as this first sampling module 111, as mentioned above, adjacent two zero crossings t1, t2 of the output current of frequency converter are sampled, by output current cycle=(t2-t1) × 2, the calculating formula in f=1/ cycle, obtain the frequency f of output current of frequency converter.
Second sampling module 112 is used for sampling to the current value I of the output current of frequency converter, as mentioned above, only samples in three-phase current.Cycle of output current that the time interval of sampling is obtained by the first sampling module 111 is decided, and as mentioned above, sampling time interval Δ x can be set as: sampling time interval Δ x=output current cycle/n.
After the current value I of the output current by sampling module 11 pairs of frequency converters and frequency f sample, depicting module 12, based on the peak value of sampled output current and frequency, draws the curent change curve of near sinusoidal.Motor status judgment means of the present invention uses the theory of infinite series, such as, as mentioned above, Mike virgin forest formula can be used to draw the change curve of sample rate current.
The alarm module 13 of motor status judgment means is sampled based on sampling module 11 current value of output current of the frequency converter obtained, detect output current whether excess current, when output current does not have excess current, alarm module 13 does not output signal, when output current excess current, alarm module 13 exports and makes comparison module 14 compare the comparison signal of action.
When comparison module 14 receives the comparison signal from alarm module 13, the near-sinusoidal that depicting module 12 is drawn out is compared with the current value of each sampled point in current period.
When the difference at the current value of sampled point and the current value of corresponding with this sampled point on drawn near-sinusoidal is in permissible range, think that the waveform of output current of frequency converter is identical with the curent change curve of drawn near sinusoidal, the judge module 15 of the alarm module 13 of motor status judgment means is judged as that motor is in locked rotor condition.When exceeding permissible range at the current value of sampled point with the difference of the current value of corresponding with this sampled point on drawn near-sinusoidal, think and do not drop on the curent change curve with drawn near sinusoidal at the output current of the frequency converter of this sampled point, the judge module 15 of motor status judgment means is judged as that motor is in overexcitation state.Concrete judgment mode is described above, at this, repeats no more.
Thus, utilize motor status judgment means of the present invention also when the output current excess current of frequency converter, the running status of motor can be judged, thus, can confirm to need which parameter to frequency converter to adjust, to meet the requirement of industry spot.
In addition, the method of above-mentioned judgement motor operating state can be stored in the storage medium of the control circuit of frequency converter as program in advance, the program running the running status of this judgement motor in the whole process of transducer drive motor can be controlled at control circuit, but due to when motor normally runs, the necessity its motor status not judged, so the travelling speed in order to improve program, preferably, only when frequency converter starter motor, run the program of the running status of this judgement motor.After this program of operation, if can be set as, motor becomes normal operating condition from starting state, and namely output current does not have excess current, and when motor speed reaches more than certain rotating speed, terminate the program of this judgement motor operating state, return normal working procedure.
According to motor status determination methods of the present invention and motor status judgment means, in the process utilizing transducer drive motor, during the output current excess current of frequency converter, the running status of motor and the state of motor speed can be judged simply, rapidly, so that make suitable counter-measure.
By judging the running status of motor, can give full play to the function of frequency converter, allowing Electric Machine Control realize robotization, for different motor loads and the condition of production, frequency converter can mate with motor load situation automatically, ensures carrying out smoothly of production.
In addition, for the frequency converter of economizing type, the range of application of frequency converter can be expanded to the good judgement of motor status and increase reliable working time, and greatly saving the cost of core devices IGBT and associated components.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the claims in the present invention scope change and modify, and all should belong to the covering scope of the claims in the present invention.
Claims (10)
1. a motor status determination methods, it, under the state using transducer drive motor, judges the running status of motor, it is characterized in that,
Comprise the following steps:
To the sampling step that current value and the frequency of the output current of frequency converter are sampled,
According to current value and the frequency of sampled described output current, that draws the curent change curve of near sinusoidal draws step,
Judge the alarming step of described output current whether excess current,
When being judged as that described output current is excess current in described alarming step, to the current value of sampled described output current with the comparison step that compares of the curent change curve of described near sinusoidal drawn out,
According to the comparative result obtained in the comparison step, judge the determining step of the running status of motor.
2. motor status determination methods as claimed in claim 1, is characterized in that,
Described sampling step has:
To the first sampling step that the frequency of described output current is sampled,
To the second sampling step that the current value of described output current is sampled.
3. motor status determination methods as claimed in claim 2, is characterized in that,
Described first sampling step comprises:
By the step that first zero crossing of zero-crossing comparator to the described output current of frequency converter is sampled,
By the step that second zero crossing of zero-crossing comparator to the described output current of frequency converter is sampled, described second zero crossing is the next zero crossing of described first zero crossing,
According to the sampling time of described first zero crossing and described second zero crossing, calculate the step of the frequency of described output current.
4. motor status determination methods as claimed in claim 1, is characterized in that,
In described determining step, when the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out do not exceed permissible range time, be judged as that motor is in the state of stall
When the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out exceed permissible range time, be judged as that motor is in overexcitation state.
5. the motor status determination methods according to any one of Claims 1 to 4, is characterized in that,
Draw in step described, use Maclaurin formula to draw the curent change curve of the near sinusoidal of described output current.
6. a motor status judgment means, it, under the state using transducer drive motor, judges the running status of motor, it is characterized in that,
Comprise:
To the sampling module that current value and the frequency of the output current of frequency converter are sampled,
According to current value and the frequency of sampled described output current, draw the depicting module of the curent change curve of near sinusoidal,
Judge the alarm module of described output current whether excess current,
When described alarm module is judged as that described output current is excess current, to the current value of sampled described output current with the comparison module that compares of the curent change curve of described near sinusoidal drawn out,
According to the comparative result of described comparison module, judge the judge module of the running status of motor.
7. motor status judgment means as claimed in claim 6, is characterized in that,
Described sampling module has:
To the first sampling module that the frequency of described output current is sampled,
To the second sampling module that the current value of described output current is sampled.
8. motor status judgment means as claimed in claim 7, is characterized in that,
Described first sampling module comprises zero-crossing comparator,
Sampled by first zero crossing of described zero-crossing comparator to the described output current of frequency converter,
Sampled by second zero crossing of described zero-crossing comparator to the described output current of frequency converter, described second zero crossing is the next zero crossing of described first zero crossing,
Described first sampling module, according to the sampling time of described first zero crossing and described second zero crossing, calculates the frequency of described output current.
9. motor status judgment means as claimed in claim 6, is characterized in that,
When the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out do not exceed permissible range time, described judge module is judged as that motor is in the state of stall
When the current value that described comparative result is the described output current at certain sampled point with the difference of the current value corresponding with this sampled point on the curent change curve of described near sinusoidal drawn out exceed permissible range time, described judge module is judged as that motor is in overexcitation state.
10. the motor status judgment means according to any one of claim 6 ~ 9, is characterized in that,
Described describing device uses Maclaurin formula to draw the near sinusoidal change curve of described output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077813.0A CN104898055B (en) | 2014-03-04 | 2014-03-04 | Motor status determination methods and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077813.0A CN104898055B (en) | 2014-03-04 | 2014-03-04 | Motor status determination methods and device |
Publications (2)
| Publication Number | Publication Date |
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| CN104898055A true CN104898055A (en) | 2015-09-09 |
| CN104898055B CN104898055B (en) | 2017-11-24 |
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| CN105800434A (en) * | 2016-05-31 | 2016-07-27 | 广州广日电梯工业有限公司 | Variable-frequency detecting system and method for door opening and closing abnormity |
| CN107561306A (en) * | 2017-08-17 | 2018-01-09 | 湖南纬拓信息科技有限公司 | Winding motor rotating speed measurement method based on rotor current |
| CN107942244A (en) * | 2016-10-13 | 2018-04-20 | 上海大郡动力控制技术有限公司 | New energy automobile motor stall fault detection method |
| CN108639903A (en) * | 2017-11-21 | 2018-10-12 | 江苏鸿山鸿锦物联技术有限公司 | A method of passing through foreign matter on current detecting elevator car door sill and hall door track |
| CN109742733A (en) * | 2019-02-22 | 2019-05-10 | 深圳市道通智能航空技术有限公司 | Over-current protection method, device, system and unmanned vehicle |
| CN109856537A (en) * | 2018-12-28 | 2019-06-07 | 神驰机电股份有限公司 | A kind of the stall detection method and system of the BLDC control circuit of list comparator |
| CN110187274A (en) * | 2019-05-31 | 2019-08-30 | 维沃移动通信有限公司 | A stepping motor detection method, device and system |
| CN110441584A (en) * | 2019-08-26 | 2019-11-12 | 珠海格力电器股份有限公司 | Equipment running state monitoring method, device, storage medium and system |
| CN111781447A (en) * | 2020-06-28 | 2020-10-16 | 珠海格力智能装备有限公司 | Method and device for determining mechanical zero point and machine tool equipment |
| CN112158561A (en) * | 2020-09-29 | 2021-01-01 | 国电泉州热电有限公司 | System and method for determining fault point of coal feeder |
| CN112217444A (en) * | 2020-10-13 | 2021-01-12 | 东风汽车有限公司 | Electric automobile water pump control method, electronic equipment and storage medium |
| CN112325932A (en) * | 2020-10-28 | 2021-02-05 | 广东寰球智能科技有限公司 | Monitoring method and monitoring device based on alternating current motor |
| CN113075548A (en) * | 2021-04-01 | 2021-07-06 | 天津小鲨鱼智能科技有限公司 | Method, device and equipment for detecting state of electric hydrofoil motor and storage medium |
| CN115580202A (en) * | 2022-09-08 | 2023-01-06 | 国网湖南电动汽车服务有限公司 | Timing limit overcurrent protection method of floating crane system and related components thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402424A (en) * | 2002-06-25 | 2003-03-12 | 满永奎 | Frequency control method for frequency changer for pumping unit |
| JP2005204431A (en) * | 2004-01-16 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Motor drive unit |
| CN201051736Y (en) * | 2007-04-26 | 2008-04-23 | 徐州工程学院 | Three-phase AC motor three-phase AC chopping frequency conversion speed control device |
| CN101349737A (en) * | 2008-09-12 | 2009-01-21 | 南京因泰莱电器股份有限公司 | Method for detecting electric motor state and discriminating start-up course |
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN202256627U (en) * | 2011-09-08 | 2012-05-30 | 山西太钢不锈钢股份有限公司 | On-line monitoring device of motor |
| CN103227605A (en) * | 2012-11-01 | 2013-07-31 | 东方日立(成都)电控设备有限公司 | Control method for preventing overvoltage of high-voltage frequency converter with fan load during speed reduction process |
-
2014
- 2014-03-04 CN CN201410077813.0A patent/CN104898055B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402424A (en) * | 2002-06-25 | 2003-03-12 | 满永奎 | Frequency control method for frequency changer for pumping unit |
| JP2005204431A (en) * | 2004-01-16 | 2005-07-28 | Matsushita Electric Ind Co Ltd | Motor drive unit |
| CN201051736Y (en) * | 2007-04-26 | 2008-04-23 | 徐州工程学院 | Three-phase AC motor three-phase AC chopping frequency conversion speed control device |
| CN101349737A (en) * | 2008-09-12 | 2009-01-21 | 南京因泰莱电器股份有限公司 | Method for detecting electric motor state and discriminating start-up course |
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN202256627U (en) * | 2011-09-08 | 2012-05-30 | 山西太钢不锈钢股份有限公司 | On-line monitoring device of motor |
| CN103227605A (en) * | 2012-11-01 | 2013-07-31 | 东方日立(成都)电控设备有限公司 | Control method for preventing overvoltage of high-voltage frequency converter with fan load during speed reduction process |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105800434B (en) * | 2016-05-31 | 2018-08-07 | 广州广日电梯工业有限公司 | The frequency conversion detecting system and method for switch gate exception |
| CN105800434A (en) * | 2016-05-31 | 2016-07-27 | 广州广日电梯工业有限公司 | Variable-frequency detecting system and method for door opening and closing abnormity |
| CN107942244B (en) * | 2016-10-13 | 2020-04-14 | 上海大郡动力控制技术有限公司 | New energy automobile motor locked-rotor fault detection method |
| CN107942244A (en) * | 2016-10-13 | 2018-04-20 | 上海大郡动力控制技术有限公司 | New energy automobile motor stall fault detection method |
| CN107561306A (en) * | 2017-08-17 | 2018-01-09 | 湖南纬拓信息科技有限公司 | Winding motor rotating speed measurement method based on rotor current |
| CN108639903A (en) * | 2017-11-21 | 2018-10-12 | 江苏鸿山鸿锦物联技术有限公司 | A method of passing through foreign matter on current detecting elevator car door sill and hall door track |
| CN109856537A (en) * | 2018-12-28 | 2019-06-07 | 神驰机电股份有限公司 | A kind of the stall detection method and system of the BLDC control circuit of list comparator |
| CN109742733A (en) * | 2019-02-22 | 2019-05-10 | 深圳市道通智能航空技术有限公司 | Over-current protection method, device, system and unmanned vehicle |
| CN110187274A (en) * | 2019-05-31 | 2019-08-30 | 维沃移动通信有限公司 | A stepping motor detection method, device and system |
| CN110441584A (en) * | 2019-08-26 | 2019-11-12 | 珠海格力电器股份有限公司 | Equipment running state monitoring method, device, storage medium and system |
| CN111781447A (en) * | 2020-06-28 | 2020-10-16 | 珠海格力智能装备有限公司 | Method and device for determining mechanical zero point and machine tool equipment |
| CN112158561A (en) * | 2020-09-29 | 2021-01-01 | 国电泉州热电有限公司 | System and method for determining fault point of coal feeder |
| CN112158561B (en) * | 2020-09-29 | 2022-04-01 | 国能(泉州)热电有限公司 | System and method for determining fault point of coal feeder |
| CN112217444A (en) * | 2020-10-13 | 2021-01-12 | 东风汽车有限公司 | Electric automobile water pump control method, electronic equipment and storage medium |
| CN112325932A (en) * | 2020-10-28 | 2021-02-05 | 广东寰球智能科技有限公司 | Monitoring method and monitoring device based on alternating current motor |
| CN113075548A (en) * | 2021-04-01 | 2021-07-06 | 天津小鲨鱼智能科技有限公司 | Method, device and equipment for detecting state of electric hydrofoil motor and storage medium |
| CN115580202A (en) * | 2022-09-08 | 2023-01-06 | 国网湖南电动汽车服务有限公司 | Timing limit overcurrent protection method of floating crane system and related components thereof |
| CN118311360A (en) * | 2024-04-29 | 2024-07-09 | 陕西吉腾顺鹏科技有限责任公司 | Motor driver stability monitoring method and system |
| CN118311360B (en) * | 2024-04-29 | 2024-10-11 | 陕西吉腾顺鹏科技有限责任公司 | Motor driver stability monitoring method and system |
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