CN104085792B - Lifting machine frequency transformer and output frequency setting method thereof - Google Patents
Lifting machine frequency transformer and output frequency setting method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of lifting machine frequency transformer and export frequency setting method, the method comprises: S1, the detection current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, described parameter ratio is carried out weighted mean and obtains detected value; The segment frequence curve that S2, basis are preset, obtains the frequency that described detected value is corresponding; S3, it is the frequency that described detected value is corresponding by output frequency setting current for lifting machine frequency transformer. The present invention carries out weighted mean by detection output current of frequency converter, Driving Torque and output rating three item data and obtains final detected value, make data more accurate, and the running frequency of frequency transformer is automatically calculated by segment frequence curve, it is made to adopt as far as possible high frequency to run in safing situation, it is to increase working efficiency.
Description
Technical field
The present invention relates to lifting machine technical field, more specifically, it relates to a kind of lifting machine frequency transformer and output frequency setting method thereof.
Background technology
In lifting industry, the underloading high speed right and wrong of frequency transformer function usually, and the calculating of running frequency is an extremely important link. In prior art, great majority adopt the method for manual evaluation, provide corresponding shelves position after carrying out roughly estimation by crane operator according to current weight-carrying capacity. If the estimation of shelves position is too low, it does not have reaching the maximum capacity that frequency transformer can export, running frequency is too low, then affect working efficiency; If the estimation of shelves position is too high, having exceeded the maximum capacity that frequency transformer can export, running frequency is too high, it is easy to fault occurs, causes great potential safety hazard. Therefore the operator of lifting machine are required very high by the method for manual evaluation, it is desired to it has certain computational estimation competence and has very abundant driving experience. At present, market also occurs some Controlling System automatically carrying out running frequency calculating, but its detection variable, and calculated value is accurate not, and the output frequency variation of final frequency transformer is bigger; And it uses simple straight line relation, it does not have distinguishing situation that is unloaded and super-heavy load, operational efficiency is not high and there is bigger potential safety hazard.
Summary of the invention
The technical problem to be solved in the present invention is, calculate for the running frequency of existing lifting machine frequency transformer and unreasonable affect working efficiency or easily cause the defect of potential safety hazard, a kind of detected value calculating weighting by considering Driving Torque, outward current and output rating is provided, then obtains the lifting machine frequency transformer of frequency and export frequency setting method.
The technical solution adopted for the present invention to solve the technical problems is: a kind of output frequency setting method constructing lifting machine frequency transformer, comprises the following steps:
S1, the detection current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, described parameter ratio is carried out weighted mean and obtains detected value;
The segment frequence curve that S2, basis are preset, obtains the frequency that described detected value is corresponding;
S3, it is the frequency that described detected value is corresponding by output frequency setting current for lifting machine frequency transformer.
In the output frequency setting method according to lifting machine frequency transformer of the present invention, described step S1 obtains detected value by following step:
S11, by output frequency current for frequency transformer with preset the first frequency compare, be less than, determine that described default weighting coefficient is the first weighting coefficient, be not less than, determine that described default weighting coefficient is the 2nd weighting coefficient;
Described parameter ratio is carried out weighted mean and obtains detected value by S12, the weighting coefficient preset adopting step S11 to determine.
In the output frequency setting method according to lifting machine frequency transformer of the present invention, described the first default frequency is 10Hz; Described first weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating; Described 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
In the output frequency setting method according to lifting machine frequency transformer of the present invention, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Unloaded interval: 0 < x < A, f=FR, wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer;
Underloading is interval: A��x < B, f=K*FR, wherein B is default underloading coefficient, and K is default weak magnetic multiple;
Heavy duty is interval: B��x < C, f=[(FR-K*FR)/(C-B)]*(x-B)+K*FR, wherein C is default permission coefficient;
Super-heavy load is interval: C��x, f=FR��
In the output frequency setting method according to lifting machine frequency transformer of the present invention, described default pine rope coefficient A is 5%, and described default underloading coefficient B is 45%, and described default permission coefficient C is 80%, and described default weak magnetic multiple K is 200%.
Present invention also offers a kind of lifting machine frequency transformer, comprise: weighted calculation module, for detecting the current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, described parameter ratio is carried out weighted mean and obtains detected value; Frequency computation part module, for according to the segment frequence curve preset, obtaining the frequency that described detected value is corresponding; And frequency setting module, for being the frequency that described detected value is corresponding by output frequency setting current for lifting machine frequency transformer.
According to, in lifting machine frequency transformer of the present invention, described weighted calculation module comprises further:
Ratio calculation unit, for detecting the current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value;
Factor determination unit, for output frequency current for frequency transformer and the first frequency preset being compared, is less than, determines that described default weighting coefficient is the first weighting coefficient, be not less than, determine that described default weighting coefficient is the 2nd weighting coefficient;
Weighted units, the parameter ratio that the weighting coefficient correlative value the preset calculating unit for adopting described factor determination unit to determine calculates carries out weighted mean and obtains detected value.
According to, in lifting machine frequency transformer of the present invention, described the first default frequency is 10Hz; Described first weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating;Described 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
According to, in lifting machine frequency transformer of the present invention, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Unloaded interval: 0 < x < A, f=FR, wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer;
Underloading is interval: A��x < B, f=K*FR, wherein B is default underloading coefficient, and K is default weak magnetic multiple;
Heavy duty is interval: B��x < C, f=[(FR-K*FR)/(C-B)]*(x-B)+K*FR, wherein C is default permission coefficient;
Super-heavy load is interval: C��x, f=FR��
According to, in lifting machine frequency transformer of the present invention, described default pine rope coefficient A is 5%, and described default underloading coefficient B is 45%, and described default permission coefficient C is 80%, and described default weak magnetic multiple K is 200%.
Implement the lifting machine frequency transformer of the present invention and export frequency setting method, there is following useful effect: the present invention carries out weighted mean by the detection current outward current of frequency transformer, Driving Torque and output rating three item data and obtains final detected value, make data more accurate, and the running frequency of frequency transformer is automatically calculated by segment frequence curve, it is made to adopt as far as possible high frequency to run in safing situation, it is to increase working efficiency.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the output frequency setting method flow diagram of lifting machine frequency transformer according to the preferred embodiment of the invention;
Fig. 2 be lifting machine frequency transformer according to the preferred embodiment of the invention output frequency setting method in the particular flow sheet of weighted calculation step;
Fig. 3 be lifting machine frequency transformer according to the preferred embodiment of the invention output frequency setting method in the schematic diagram of segment frequence curve;
Fig. 4 is the module frame chart of lifting machine frequency transformer according to the preferred embodiment of the invention;
Fig. 5 is the module frame chart of weighted calculation module in lifting machine frequency transformer according to the preferred embodiment of the invention.
Embodiment
In order to make the object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.
Refer to Fig. 1, it is the output frequency setting method flow diagram of lifting machine frequency transformer according to the preferred embodiment of the invention. As shown in Figure 1, the output frequency setting method of the lifting machine frequency transformer that this embodiment provides, comprises the following steps:
First, in step sl, detection current Driving Torque T, the outward current I and output rating P of frequency transformer, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, these 3 parameter ratios are carried out weighted mean and obtain detected value x. This step S1 can first by the per-cent of each variable of following formulae discovery and respective rated value as parameter ratio:
The parameter ratio of Driving Torque is t%=T/TR, wherein, TRFor Driving Torque rated value;
The parameter ratio of outward current is i%=I/IR, wherein, IRFor outward current rated value;
The parameter ratio of output rating is p%=P/PR, wherein, PRFor output rating rated value.
In this step, the data of current Driving Torque of frequency transformer detection can also be directly the per-cent with nominal torque, thus direct using the parameter ratio of this per-cent as Driving Torque. This area basic technology personnel can set weighting coefficient according to experience, by weighted average calculation detected value x.In a preferred embodiment of the invention, this weighting coefficient preset can be a fixing weighting coefficient, if default weighting coefficient is the parameter ratio correspondence 20%, 50% and 30%, detected value x=t%*20%+i%*50%+p%*30% respectively of Driving Torque, outward current and output rating. In another preferred embodiment of the invention, the output frequency that this weighting coefficient preset can also be preferably current to frequency transformer is relevant, as described in the embodiment of subsequent figure 2.
Subsequently, in step s 2, according to default segment frequence curve, the frequency f that the detected value x that obtaining step S1 obtains is corresponding. By detected value x carry over score band frequency curve, try to achieve the value of f.
In a preferred embodiment of the invention, this segment frequence curve at least comprises unloaded interval, super-heavy load interval and intermediate loads interval. Wherein unloaded interval is: 0 < x < A, f=FR; Wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer; Unloaded interval expression does not currently have load, therefore can adopt rated frequency FRAvoiding driving occur, this interval can not underloading high speed. Super-heavy load interval is: C��x, f=FR; Wherein C is default permission coefficient; Super-heavy load interval represents that current load is outside controlled range, does not belong to underloading high speed scope, therefore adopts rated frequency FRExport. Intermediate loads interval is: A��x < C, represents that current load is in controlled range, it is possible to adopt higher than rated frequency FRFrequency run. Such as, intermediate loads interval can adopt fixing frequency such as theoretical maximum running frequency to run, i.e. f=K*FR, wherein K is default weak magnetic multiple. Again such as, intermediate loads interval can also adopt connection (A, K*FR) and (C, FR) slope be the straight-line segment of negative, i.e. f=[(FR-K*FR)/(C-A)]*(x-A)+K*FR��
In another preferred embodiment of the invention, it is interval interval with heavy duty that the intermediate loads interval in segment frequence curve can also be further divided into underloading, such as the description that follow-up composition graphs 3 carries out.
Finally, in step s3, being frequency f corresponding to detected value x that step S2 obtains by output frequency setting current for lifting machine frequency transformer, namely this output frequency run is set to f.
Incorporated by reference to consulting Fig. 2, it it is the particular flow sheet of weighted calculation step in the output frequency setting method of lifting machine frequency transformer according to the preferred embodiment of the invention. The output frequency that weighting coefficient default in this embodiment is current to frequency transformer is relevant. As shown in Figure 2, step S1 obtains detected value by following step:
In step s 11, output frequency current for frequency transformer and the first frequency preset are compared, is less than, determines that the weighting coefficient preset is the first weighting coefficient, be not less than, determine that the weighting coefficient preset is the 2nd weighting coefficient. In a preferred embodiment of the invention, this first frequency preset is 10Hz. First weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating. 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
In step s 12, parameter ratio is carried out weighted mean and obtains detected value x by the weighting coefficient preset adopting step S11 to determine. In aforementioned preferred embodiments, this step is equal to:
1) when the output frequency that frequency transformer is current is less than 10Hz, default weighting coefficient is respectively 20%, 50% and 30%, i.e. detected value x=t%*20%+i%*50%+p%*30%;
2) when the output frequency that frequency transformer is current is more than or equal to 10Hz, default weighting coefficient is respectively 50%, 20% and 30%, i.e. detected value x=t%*50%+i%*20%+p%*30%.
Refer to Fig. 3, it is the schematic diagram of segment frequence curve in the output frequency setting method of lifting machine frequency transformer according to the preferred embodiment of the invention. As shown in Figure 3, this segment frequence curve is the multistage curve of detected value x and frequency f.
This segment frequence curve at least comprises unloaded interval, underloading is interval, heavy duty is interval and super-heavy load is interval:
1) unloaded interval: 0 < x < A, f=FR; Wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer. Unloaded interval expression does not currently have load, therefore can adopt rated frequency FRAvoiding driving occur, this interval can not underloading high speed.
2) underloading is interval: A��x < B, f=K*FR, wherein B is default underloading coefficient, and K is default weak magnetic multiple. Underloading interval represents that current load is smaller, it is possible to run to theoretical maximum running frequency.
3) heavy duty is interval: B��x < C, f=[(FR-K*FR)/(C-B)]*(x-B)+K*FR, wherein C is default permission coefficient. Heavy duty is interval represents that current load is relatively big, but in controlled range, frequency can at (B, K*FR) and (C, FR) on the straight line that connects of these two coordinate point, for slope is negative straight-line segment.
4) super-heavy load is interval: C��x, f=FR; Wherein C is default permission coefficient. Super-heavy load interval represents that current load is outside controlled range, does not belong to underloading high speed scope, therefore adopts rated frequency FRExport.
In an embodiment, when the output frequency that frequency transformer is current be greater than 10Hz time, if outward current rated value IRFor 50A, output rating rated value PRFor 20kW; Frequency transformer detection obtains outward current I=10A, output rating P=10kW, corresponding parameter ratio i%=10A/50A=20%, p%=10kW/20kW=50%. It is 50% that frequency transformer also directly detects the per-cent of Driving Torque and nominal torque, therefore the parameter ratio t%=50% of Driving Torque. Thus obtain detected value:
X=t%*50%+i%*20%+p%*30%=50%*50%+20%*20%+50%*30%=44%;
The function code of frequency transformer is set as weak magnetic multiple K=200%; Pine rope coefficient A=5%, underloading coefficient B=45%; Allow coefficient C=80%; The rated frequency F of frequency transformerRFor 50Hz. According to curve, at this time detected value A��x < B, is positioned at underloading interval, f=K*FR=100Hz. Therefore, this output frequency run is set to 100Hz.
Refer to Fig. 4, it is the module frame chart of lifting machine frequency transformer according to the preferred embodiment of the invention. As shown in Figure 4, the lifting machine frequency transformer 100 that this embodiment provides comprises: weighted calculation module 10, frequency computation part module 20 and frequency setting module 30.
Wherein, weighted calculation module 10 for detecting the current Driving Torque T of frequency transformer, outward current I and output rating P, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, these 3 parameter ratios are carried out weighted mean and obtain detected value x. The principle of this weighted calculation module 10 is identical with abovementioned steps S1 with process. This weighted calculation module 10 can first by the per-cent of each variable of following formulae discovery and respective rated value as parameter ratio:
The parameter ratio of Driving Torque is t%=T/TR, wherein, TRFor Driving Torque rated value;
The parameter ratio of outward current is i%=I/IR, wherein, IRFor outward current rated value;
The parameter ratio of output rating is p%=P/PR, wherein, PRFor output rating rated value.
The data of the current Driving Torque of frequency transformer that weighted calculation module 10 detects can also be directly the per-cent with nominal torque, thus direct using the parameter ratio of this per-cent as Driving Torque.
This area basic technology personnel can set weighting coefficient according to experience, by weighted average calculation detected value x.
Frequency computation part module 20 is connected with weighted calculation module 10, for the segment frequence curve that basis is preset, and the frequency f that the detected value x that acquisition weighted calculation module 10 obtains is corresponding. The principle of this frequency computation part module 20 is identical with abovementioned steps S2 with process. This segment frequence curve can also at least comprise unloaded interval, super-heavy load interval and intermediate loads interval as in the preceding embodiment. It is also preferred that this segment frequence curve can also adopt as shown in Figure 3 four section curve, namely unloaded interval, underloading interval interval, heavily loaded and super-heavy load are interval.
Frequency setting module 30 is connected with frequency computation part module 20, and for being the frequency f that detected value x that frequency computation part module 20 obtains is corresponding by output frequency setting current for lifting machine frequency transformer, namely this output frequency run is set to f. The principle of this frequency computation part module 20 is identical with abovementioned steps S3 with process.
Refer to Fig. 5, it is the module frame chart of weighted calculation module in lifting machine frequency transformer according to the preferred embodiment of the invention. As shown in Figure 5, this embodiment weighted calculation module 10 comprises: ratio calculation unit 11, factor determination unit 12 and weighted units 13.
Wherein, ratio calculation unit 11, for detecting the current Driving Torque T of frequency transformer, outward current I and output rating P, and calculate with the parameter ratio of respective rated value.
Factor determination unit 12, for output frequency current for frequency transformer and the first frequency preset being compared, is less than, determines that the weighting coefficient preset is the first weighting coefficient, be not less than, determine that the weighting coefficient preset is the 2nd weighting coefficient. The principle of this factor determination unit 12 is identical with step S11 in aforementioned method with process. In a preferred embodiment of the invention, this first frequency preset is 10Hz. First weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating. 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
Weighted units 13 is connected with factor determination unit 12 with ratio calculation unit 11, and the parameter ratio that the weighting coefficient correlative value the preset calculating unit 11 for adopting factor determination unit 12 to determine calculates carries out weighted mean and obtains detected value x. The principle of this weighted units 13 is identical with step S12 in aforementioned method with process. In a preferred embodiment, this weighted units 13 performs following operation:
1) when the output frequency that frequency transformer is current is less than 10Hz, default weighting coefficient is respectively 20%, 50% and 30%, i.e. detected value x=t%*20%+i%*50%+p%*30%;
2) when the output frequency that frequency transformer is current is more than or equal to 10Hz, default weighting coefficient is respectively 50%, 20% and 30%, i.e. detected value x=t%*50%+i%*20%+p%*30%.
In other embodiments of the present invention, factor determination unit 12 can omit, and after ratio calculation unit 11 calculating parameter ratio, weighted units 13 directly adopts fixing weighting coefficient to calculate detected value x.If default weighting coefficient is the parameter ratio correspondence 20%, 50% and 30%, detected value x=t%*20%+i%*50%+p%*30% respectively of Driving Torque, outward current and output rating.
In sum, the present invention can carry out weighted mean by the detection current outward current of frequency transformer, Driving Torque and output rating three item data and obtain final detected value, make data more accurate, and the running frequency of frequency transformer is automatically calculated by segment frequence curve, it is made to adopt as far as possible high frequency to run in safing situation, it is to increase working efficiency. The present invention also further by pine restrict coefficient, underloading coefficient and allow coefficient three parameters underloading high speed curve is divided into four parts so that underloading process is safer, operational efficiency is higher.
It should be understood that, the lifting machine frequency transformer of the present invention is identical with realization flow with the principle of the output frequency setting method of lifting machine frequency transformer, the output frequency setting method that therefore specific descriptions of the embodiment of lifting machine frequency transformer of the present invention are applicable to lifting machine frequency transformer of the present invention, vice versa.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that when not departing from the scope of the invention, can carry out various change and equivalent replacement. In addition, for adapting to the specific occasion of the technology of the present invention, the present invention can be carried out many amendments and do not depart from its protection domain. Therefore, it is intended that the invention not be limited to specific embodiment disclosed herein, and comprise all embodiments dropping into claims.
Claims (10)
1. the output frequency setting method of a lifting machine frequency transformer, it is characterised in that, comprise the following steps:
S1, the detection current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, described parameter ratio is carried out weighted mean and obtains detected value;
The segment frequence curve that S2, basis are preset, obtains the frequency that described detected value is corresponding;
S3, it is the frequency that described detected value is corresponding by output frequency setting current for lifting machine frequency transformer.
2. the output frequency setting method of lifting machine frequency transformer according to claim 1, it is characterised in that, described step S1 obtains detected value by following step:
S11, by output frequency current for frequency transformer with preset the first frequency compare, be less than, determine that described default weighting coefficient is the first weighting coefficient, be not less than, determine that described default weighting coefficient is the 2nd weighting coefficient;
Described parameter ratio is carried out weighted mean and obtains detected value by S12, the weighting coefficient preset adopting step S11 to determine.
3. the output frequency setting method of lifting machine frequency transformer according to claim 2, it is characterised in that, described the first default frequency is 10Hz; Described first weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating; Described 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
4. the output frequency setting method of lifting machine frequency transformer according to claim 1, it is characterised in that, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Unloaded interval: 0 < x < A, f=FR, wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer;
Underloading is interval: A��x < B, f=K*FR, wherein B is default underloading coefficient, and K is default weak magnetic multiple;
Heavy duty is interval: B��x < C, f=[(FR-K*FR)/(C-B)]*(x-B)+K*FR, wherein C is default permission coefficient;
Super-heavy load is interval: C��x, f=FR��
5. the output frequency setting method of lifting machine frequency transformer according to claim 4, it is characterized in that, described default pine rope coefficient A is 5%, and described default underloading coefficient B is 45%, described default permission coefficient C is 80%, and described default weak magnetic multiple K is 200%.
6. a lifting machine frequency transformer, it is characterised in that, comprising:
Weighted calculation module, for detecting the current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value, by default weighting coefficient, described parameter ratio is carried out weighted mean and obtains detected value;
Frequency computation part module, for according to the segment frequence curve preset, obtaining the frequency that described detected value is corresponding;
Frequency setting module, for being the frequency that described detected value is corresponding by output frequency setting current for lifting machine frequency transformer.
7. lifting machine frequency transformer according to claim 6, it is characterised in that, described weighted calculation module comprises further:
Ratio calculation unit, for detecting the current Driving Torque of frequency transformer, outward current and output rating, and calculate with the parameter ratio of respective rated value;
Factor determination unit, for output frequency current for frequency transformer and the first frequency preset being compared, is less than, determines that described default weighting coefficient is the first weighting coefficient, be not less than, determine that described default weighting coefficient is the 2nd weighting coefficient;
Weighted units, the parameter ratio that the weighting coefficient correlative value the preset calculating unit for adopting described factor determination unit to determine calculates carries out weighted mean and obtains detected value.
8. lifting machine frequency transformer according to claim 7, it is characterised in that, described the first default frequency is 10Hz; Described first weighting coefficient is the parameter ratio correspondence 20%, 50% and 30% respectively of Driving Torque, outward current and output rating; Described 2nd weighting coefficient is the parameter ratio correspondence 50%, 20% and 30% respectively of Driving Torque, outward current and output rating.
9. lifting machine frequency transformer according to claim 6, it is characterised in that, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Unloaded interval: 0 < x < A, f=FR, wherein A is default pine rope coefficient, FRFor the rated frequency of frequency transformer;
Underloading is interval: A��x < B, f=K*FR, wherein B is default underloading coefficient, and K is default weak magnetic multiple;
Heavy duty is interval: B��x < C, f=[(FR-K*FR)/(C-B)]*(x-B)+K*FR, wherein C is default permission coefficient;
Super-heavy load is interval: C��x, f=FR��
10. lifting machine frequency transformer according to claim 9, it is characterised in that, described default pine rope coefficient A is 5%, and described default underloading coefficient B is 45%, and described default permission coefficient C is 80%, and described default weak magnetic multiple K is 200%.
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| CN106094914B (en) * | 2016-07-04 | 2018-06-12 | 太原重工股份有限公司 | Straightener main transmission control method and system |
| CN108750946B (en) * | 2018-05-23 | 2024-04-09 | 四川庞源机械工程有限公司 | Crane load identification, measurement and adjustment control method |
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| CN201313790Y (en) * | 2008-12-12 | 2009-09-23 | 鞍钢股份有限公司 | Comprehensive monitoring system for ladle crane |
| CN201952119U (en) * | 2011-01-10 | 2011-08-31 | 广东永通起重机械实业有限公司 | Random gear variable frequency speed regulation control system |
| CN103043546A (en) * | 2012-12-26 | 2013-04-17 | 苏州汇川技术有限公司 | Rotation control system and method for tower crane |
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