CN104085792A - Crane frequency converter and output frequency setting method thereof - Google Patents
Crane frequency converter and output frequency setting method thereof Download PDFInfo
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Abstract
The invention relates to a crane frequency converter and an output frequency setting method of the crane frequency converter. The method comprises the following steps: S1, detecting current output torque, output current and output power of the frequency converter, calculating parameters ratios of respective rated values, weighting and averaging the parameter ratios through a predetermined weighting coefficient to obtain a detection value; S2, obtaining frequency corresponding to the detection value according to a predetermined segment frequency curve; and S3, setting the current output frequency of the crane frequency converter as the frequency corresponding to the detection value. By virtue of the method, the final detection value is obtained by weighting and averaging the detected output current, the output torque and the output power of the frequency converter, so that the data is relatively accurate; the operation frequency of the frequency converter is automatically calculated according to the segment frequency curve, so that the frequency converter can operate with the frequency as high as possible under the condition that the safety is guaranteed, and the working efficiency is improved.
Description
Technical field
The present invention relates to hoisting crane technical field, more particularly, relate to a kind of hoisting crane frequency converter and output frequency establishing method thereof.
Background technology
In lifting industry, the usually function of use of underloading high speed right and wrong of frequency converter, and the calculating of running frequency is a very important link.In prior art, great majority adopt the manually method of assessment, after roughly being estimated, provide corresponding gear by crane operation personnel according to current load carrying ability.If gear estimation is too low, do not reach the maximum capacity that frequency converter can be exported, running frequency is too low, affects work efficiency; If gear estimation is too high, exceed the maximum capacity that frequency converter can be exported, running frequency is too high, and easily et out of order, causes great potential safety hazard.Therefore manually the method for assessment is very high to the operating personal requirement of hoisting crane, requires it to have certain computational estimation competence and has very abundant driving experience.At present, also occurred some control system of automatically carrying out running frequency calculating on market, but it detects a variable, computing value is accurate not, and the output frequency deviation of final frequency converter is larger; And it uses simple linear relation, do not distinguish the situation of unloaded and super-heavy load, the potential safety hazard that operating efficiency is not high and existence is larger.
Summary of the invention
The technical problem to be solved in the present invention is, calculate the unreasonable defect that affects work efficiency or easily cause potential safety hazard for the running frequency of existing hoisting crane frequency converter, provide a kind of and calculate the detected value of weighting by considering output torque, outgoing current and horsepower output, then obtain hoisting crane frequency converter and the output frequency establishing method thereof of frequency.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of output frequency establishing method of hoisting crane frequency converter, comprise the following steps:
S1, detect frequency converter current output torque, outgoing current and horsepower output, and calculate and the parameter ratio of rated value separately, by default coefficient of weight, described parameter ratio is weighted and on average obtains detected value;
S2, according to default segment frequence curve, obtain the frequency that described detected value is corresponding;
S3, output frequency current hoisting crane frequency converter is set as to the frequency that described detected value is corresponding.
According in the output frequency establishing method of hoisting crane frequency converter of the present invention, in described step S1, obtain detected value by following steps:
S11, output frequency current frequency converter and default first frequency are compared, be less than and determine that described default coefficient of weight is the first coefficient of weight, be not less than and determine that described default coefficient of weight is the second coefficient of weight;
S12, the default coefficient of weight that adopts step S11 to determine are weighted and on average obtain detected value described parameter ratio.
According in the output frequency establishing method of hoisting crane frequency converter of the present invention, described default first frequency is 10Hz; Described the first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output; Described the second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
According in the output frequency establishing method of hoisting crane frequency converter of the present invention, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Between idling region: 0<x<A, f=F
r, wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter;
Between light loading district: A≤x<B, f=K*F
r, wherein B is default underloading coefficient, K is the weak magnetic multiple of presetting;
Heavy duty is interval: B≤x<C, f=[(F
r-K*F
r)/(C-B)] * (x-B)+K*F
r, wherein C is the permission coefficient of presetting;
Super-heavy load interval: C≤x, f=F
r.
According in the output frequency establishing method of hoisting crane frequency converter of the present invention, described default slack 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%.
The present invention also provides a kind of hoisting crane frequency converter, comprise: weighted calculation module, for detection of frequency converter current output torque, outgoing current and horsepower output, and calculate and the parameter ratio of rated value separately, by default coefficient of weight, described parameter ratio is weighted and on average obtains detected value; Frequency computation part module, for according to default segment frequence curve, obtains the frequency that described detected value is corresponding; And frequency setting module, for output frequency current hoisting crane frequency converter is set as to the frequency that described detected value is corresponding.
According in hoisting crane frequency converter of the present invention, described weighted calculation module further comprises:
Ratio calculation unit, for detection of frequency converter current output torque, outgoing current and horsepower output, and calculates and the parameter ratio of rated value separately;
Parameter identification unit, for output frequency current frequency converter and default first frequency are compared, is less than and determines that described default coefficient of weight is the first coefficient of weight, is not less than and determines that described default coefficient of weight is the second coefficient of weight;
Weighted units, is weighted and on average obtains detected value for the parameter ratio that adopts the definite default coefficient of weight correlative value calculating unit in described parameter identification unit to calculate.
According in hoisting crane frequency converter of the present invention, described default first frequency is 10Hz; Described the first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output; Described the second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
According in hoisting crane frequency converter of the present invention, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Between idling region: 0<x<A, f=F
r, wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter;
Between light loading district: A≤x<B, f=K*F
r, wherein B is default underloading coefficient, K is the weak magnetic multiple of presetting;
Heavy duty is interval: B≤x<C, f=[(F
r-K*F
r)/(C-B)] * (x-B)+K*F
r, wherein C is the permission coefficient of presetting;
Super-heavy load interval: C≤x, f=F
r.
According in hoisting crane frequency converter of the present invention, described default slack 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 hoisting crane frequency converter of the present invention and output frequency establishing method thereof, there is following beneficial effect: the present invention on average obtains final detected value by detecting the current outgoing current of frequency converter, output torque and horsepower output three item numbers according to being weighted, make data more accurate, and automatically calculate the running frequency of frequency converter by segment frequence curve, make it in safing situation, adopt the frequency operation of trying one's best high, improved work efficiency.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the output frequency establishing method diagram of circuit of hoisting crane frequency converter according to the preferred embodiment of the invention;
Fig. 2 is the particular flow sheet of weighted calculation step in the output frequency establishing method of hoisting crane frequency converter according to the preferred embodiment of the invention;
Fig. 3 is the schematic diagram of segment frequence curve in the output frequency establishing method of hoisting crane frequency converter according to the preferred embodiment of the invention;
Fig. 4 is the module frame chart of hoisting crane frequency converter according to the preferred embodiment of the invention;
Fig. 5 is the module frame chart of weighted calculation module in hoisting crane frequency converter according to the preferred embodiment of the invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.
Referring to Fig. 1, is the output frequency establishing method diagram of circuit of hoisting crane frequency converter according to the preferred embodiment of the invention.As shown in Figure 1, the output frequency establishing method of the hoisting crane frequency converter that this embodiment provides, comprises the following steps:
First, in step S1, detect frequency converter current output torque T, outgoing current I and horsepower output P, and calculate and the parameter ratio of rated value separately, by default coefficient of weight, these 3 parameter ratios are weighted and on average obtain detected value x.The percentum that this step S1 can be first calculates each variable and rated value separately by following formula is as parameter ratio:
The parameter ratio of output torque is t%=T/T
r, wherein, T
rfor output torque rated value;
The parameter ratio of outgoing current is i%=I/I
r, wherein, I
rfor output current rating;
The parameter ratio of horsepower output is p%=P/P
r, wherein, P
rfor horsepower output rated value.
In this step, the data of current output torque that frequency converter detects can be directly also and the percentum of torque rating, thereby directly using this percentum as the parameter ratio of exporting torque.This area supporting technology personnel can rule of thumb set coefficient of weight, by weighted average calculation detected value x.In a preferred embodiment of the invention, this default coefficient of weight can be a fixing coefficient of weight, if default coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output, detected value x=t%*20%+i%*50%+p%*30%.In another preferred embodiment of the present invention, the output frequency that this default coefficient of weight also can be preferably current to frequency converter is relevant, described in the embodiment of subsequent figure 2.
Subsequently, in step S2, according to default segment frequence curve, frequency f corresponding to detected value x that obtaining step S1 obtains.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 comprise between idling region, between the interval and middle load region of super-heavy load.Between idling region, be wherein: 0<x<A, f=F
r; Wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter; Between idling region, represent the current load that do not have, therefore can adopt rated frequency F
ravoid occurring driving, this interval can not underloading high speed.Super-heavy load interval is: C≤x, f=F
r; Wherein C is the permission coefficient of presetting; Super-heavy load is interval represents that present load, outside controlled range, does not belong to underloading high-speed range, therefore adopts rated frequency F
routput.Between middle load region, be: A≤x<C, represents that present load, in controlled range, can adopt higher than rated frequency F
rfrequency operation.For example, between middle load region, can adopt fixing frequency to move as theoretical maximum running frequency, i.e. f=K*F
r, wherein K is the weak magnetic multiple of presetting.Again for example, between middle load region, also can adopt connection (A, K*F
r) and (C, F
r) slope be negative linear portion, i.e. f=[(F
r-K*F
r)/(C-A)] * (x-A)+K*F
r.
In another preferred embodiment of the present invention, between the middle load region in segment frequence curve, can also be further divided between light loading district and heavy duty interval, the description of carrying out as follow-up combination Fig. 3.
Finally, in step S3, output frequency current hoisting crane frequency converter is set as to frequency f corresponding to detected value x that step S2 obtains, i.e. the output frequency of this operation is made as f.
Incorporated by reference to consulting Fig. 2, it is the particular flow sheet of weighted calculation step in the output frequency establishing method of hoisting crane frequency converter according to the preferred embodiment of the invention.In this embodiment, the default coefficient of weight output frequency current to frequency converter is relevant.As shown in Figure 2, in step S1, obtain detected value by following steps:
In step S11, output frequency current frequency converter and default first frequency are compared, be less than and determine that default coefficient of weight is the first coefficient of weight, be not less than and determine that default coefficient of weight is the second coefficient of weight.In a preferred embodiment of the invention, this default first frequency is 10Hz.The first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output.The second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
In step S12, the default coefficient of weight that adopts step S11 to determine is weighted and on average obtains detected value x parameter ratio.In aforementioned preferred embodiments, this step is equal to:
1) in the time that the current output frequency of frequency converter is less than 10Hz, default coefficient of weight is respectively 20%, 50% and 30%, i.e. detected value x=t%*20%+i%*50%+p%*30%;
2) in the time that the current output frequency of frequency converter is more than or equal to 10Hz, default coefficient of weight is respectively 50%, 20% and 30%, i.e. detected value x=t%*50%+i%*20%+p%*30%.
Referring to Fig. 3, is the schematic diagram of segment frequence curve in the output frequency establishing method of hoisting crane frequency converter according to the preferred embodiment of the invention.As shown in Figure 3, the multistage curve that this segment frequence curve is detected value x and frequency f.
This segment frequence curve at least comprises between idling region, between light loading district, heavily loaded interval and super-heavy load interval:
1) between idling region: 0<x<A, f=F
r; Wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter.Between idling region, represent the current load that do not have, therefore can adopt rated frequency F
ravoid occurring driving, this interval can not underloading high speed.
2) between light loading district: A≤x<B, f=K*F
r, wherein B is default underloading coefficient, K is the weak magnetic multiple of presetting.Between light loading district, represent that present load is smaller, can run to theoretical maximum running frequency.
3) heavy duty is interval: B≤x<C, f=[(F
r-K*F
r)/(C-B)] * (x-B)+K*F
r, wherein C is the permission coefficient of presetting.Heavy duty is interval represents that present load is larger, but in controlled range, frequency can be at (B, K*F
r) and (C, F
r) on the straight line that connects of these two coordinate points, for slope is negative linear portion.
4) super-heavy load interval: C≤x, f=F
r; Wherein C is the permission coefficient of presetting.Super-heavy load is interval represents that present load, outside controlled range, does not belong to underloading high-speed range, therefore adopts rated frequency F
routput.
In one embodiment, when the current output frequency of frequency converter be greater than 10Hz time, establish output current rating I
rfor 50A, horsepower output rated value P
rfor 20kW; Frequency converter detects and obtains outgoing current I=10A, horsepower output P=10kW, corresponding parameter ratio i%=10A/50A=20%, p%=10kW/20kW=50%.Frequency converter also direct-detection is 50% to the percentum of output torque and torque rating, therefore exports the parameter ratio t%=50% of torque.Obtain thus detected value:
x＝t％*50％+i％*20％+p％*30％＝50％*50％+20％*20％+50％*30％＝44％；
The function code of frequency converter is set as weak magnetic multiple K=200%; Slack rope coefficient A=5%, underloading coefficient B=45%; Allow coefficient C=80%; The rated frequency F of frequency converter
rfor 50Hz.According to curve, at this time detected value A≤x<B, is positioned between light loading district f=K*F
r=100Hz.Therefore, the output frequency of this operation is made as 100Hz.
Referring to Fig. 4, is the module frame chart of hoisting crane frequency converter according to the preferred embodiment of the invention.As shown in Figure 4, the hoisting crane frequency converter 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 is for detection of frequency converter current output torque T, outgoing current I and horsepower output P, and calculates and the parameter ratio of rated value separately, by default coefficient of weight, these 3 parameter ratios is weighted and on average obtains detected value x.The principle of this weighted calculation module 10 is identical with abovementioned steps S1 with process.The percentum that this weighted calculation module 10 can be first calculated each variable and rated value separately by following formula is as parameter ratio:
The parameter ratio of output torque is t%=T/T
r, wherein, T
rfor output torque rated value;
The parameter ratio of outgoing current is i%=I/I
r, wherein, I
rfor output current rating;
The parameter ratio of horsepower output is p%=P/P
r, wherein, P
rfor horsepower output rated value.
The data of the current output torque of frequency converter that weighted calculation module 10 detects also can be directly for the percentum of torque rating, thereby the direct parameter ratio using this percentum as output torque.
This area supporting technology personnel can rule of thumb set coefficient of weight, by weighted average calculation detected value x.
Frequency computation part module 20 is connected with weighted calculation module 10, for according to default segment frequence curve, obtains frequency f corresponding to detected value x that weighted calculation module 10 obtains.The principle of this frequency computation part module 20 is identical with abovementioned steps S2 with process.This segment frequence curve also can at least comprise between idling region described in previous embodiment, super-heavy load is interval and middle load region between.Equally preferably, this segment frequence curve also can adopt four sections of curves as shown in Figure 3, between idling region, between light loading district, heavily loaded interval and super-heavy load interval.
Frequency setting module 30 is connected with frequency computation part module 20, frequency f corresponding to detected value x obtaining for output frequency current hoisting crane frequency converter being set as to frequency computation part module 20, i.e. and the output frequency of this operation is made as f.The principle of this frequency computation part module 20 is identical with abovementioned steps S3 with process.
Referring to Fig. 5, is the module frame chart of weighted calculation module in hoisting crane frequency converter according to the preferred embodiment of the invention.As shown in Figure 5, this embodiment weighted calculation module 10 comprises: ratio calculation unit 11, parameter identification unit 12 and weighted units 13.
Wherein, ratio calculation unit 11, for detection of frequency converter current output torque T, outgoing current I and horsepower output P, and calculates and the parameter ratio of rated value separately.
Parameter identification unit 12, for output frequency current frequency converter and default first frequency are compared, is less than and determines that default coefficient of weight is the first coefficient of weight, is not less than and determines that default coefficient of weight is the second coefficient of weight.The principle of this parameter identification unit 12 is identical with step S11 in preceding method with process.In a preferred embodiment of the invention, this default first frequency is 10Hz.The first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output.The second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
Weighted units 13 is connected with parameter identification unit 12 with ratio calculation unit 11, and the parameter ratio calculating for the default coefficient of weight correlative value calculating unit 11 that adopts parameter identification unit 12 to determine is weighted and on average obtains detected value x.The principle of this weighted units 13 is identical with step S12 in preceding method with process.In a preferred embodiment, this weighted units 13 is carried out following operation:
1) in the time that the current output frequency of frequency converter is less than 10Hz, default coefficient of weight is respectively 20%, 50% and 30%, i.e. detected value x=t%*20%+i%*50%+p%*30%;
2) in the time that the current output frequency of frequency converter is more than or equal to 10Hz, default coefficient of weight is respectively 50%, 20% and 30%, i.e. detected value x=t%*50%+i%*20%+p%*30%.
In other embodiment of the present invention, parameter identification unit 12 can omit, and after ratio calculation unit 11 calculating parameter ratios, weighted units 13 directly adopts fixing coefficient of weight to calculate detected value x.If default coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output, detected value x=t%*20%+i%*50%+p%*30%.
In sum, the present invention can on average obtain final detected value according to being weighted by detecting the current outgoing current of frequency converter, output torque and horsepower output three item numbers, make data more accurate, and automatically calculate the running frequency of frequency converter by segment frequence curve, make it in safing situation, adopt the frequency operation of trying one's best high, improved work efficiency.The present invention is also further by slack rope coefficient, underloading coefficient with allow three parameters of coefficient that underloading high speed curve is divided into four parts, makes that underloading process is safer, operating efficiency is higher.
It should be understood that, hoisting crane frequency converter of the present invention is identical with principle and the realization flow of the output frequency establishing method of hoisting crane frequency converter, therefore the specific descriptions of the embodiment to hoisting crane frequency converter of the present invention are applicable to the output frequency establishing method of hoisting crane frequency converter of the present invention, and vice versa.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that in the time not departing from the scope of the invention, can carry out various variations and be equal to replacement.In addition,, for adapting to the specific occasion of the technology of the present invention, can carry out many amendments and not depart from its protection domain the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises all embodiment that drop into claim protection domain.
Claims (10)
1. an output frequency establishing method for hoisting crane frequency converter, is characterized in that, comprises the following steps:
S1, detect frequency converter current output torque, outgoing current and horsepower output, and calculate and the parameter ratio of rated value separately, by default coefficient of weight, described parameter ratio is weighted and on average obtains detected value;
S2, according to default segment frequence curve, obtain the frequency that described detected value is corresponding;
S3, output frequency current hoisting crane frequency converter is set as to the frequency that described detected value is corresponding.
2. the output frequency establishing method of hoisting crane frequency converter according to claim 1, is characterized in that, in described step S1, obtains detected value by following steps:
S11, output frequency current frequency converter and default first frequency are compared, be less than and determine that described default coefficient of weight is the first coefficient of weight, be not less than and determine that described default coefficient of weight is the second coefficient of weight;
S12, the default coefficient of weight that adopts step S11 to determine are weighted and on average obtain detected value described parameter ratio.
3. the output frequency establishing method of hoisting crane frequency converter according to claim 2, is characterized in that, described default first frequency is 10Hz; Described the first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output; Described the second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
4. the output frequency establishing method of hoisting crane frequency converter according to claim 1, is characterized in that, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Between idling region: 0<x<A, f=F
r, wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter;
Between light loading district: A≤x<B, f=K*F
r, wherein B is default underloading coefficient, K is the weak magnetic multiple of presetting;
Heavy duty is interval: B≤x<C, f=[(F
r-K*F
r)/(C-B)] * (x-B)+K*F
r, wherein C is the permission coefficient of presetting;
Super-heavy load interval: C≤x, f=F
r.
5. the output frequency establishing method of hoisting crane frequency converter according to claim 4, it is characterized in that, described default slack 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 hoisting crane frequency converter, is characterized in that, comprising:
Weighted calculation module, for detection of frequency converter current output torque, outgoing current and horsepower output, and calculates and the parameter ratio of rated value separately, by default coefficient of weight, described parameter ratio is weighted and on average obtains detected value;
Frequency computation part module, for according to default segment frequence curve, obtains the frequency that described detected value is corresponding;
Frequency setting module, for being set as by output frequency current hoisting crane frequency converter the frequency that described detected value is corresponding.
7. hoisting crane frequency converter according to claim 5, is characterized in that, described weighted calculation module further comprises:
Ratio calculation unit, for detection of frequency converter current output torque, outgoing current and horsepower output, and calculates and the parameter ratio of rated value separately;
Parameter identification unit, for output frequency current frequency converter and default first frequency are compared, is less than and determines that described default coefficient of weight is the first coefficient of weight, is not less than and determines that described default coefficient of weight is the second coefficient of weight;
Weighted units, is weighted and on average obtains detected value for the parameter ratio that adopts the definite default coefficient of weight correlative value calculating unit in described parameter identification unit to calculate.
8. hoisting crane frequency converter according to claim 6, is characterized in that, described default first frequency is 10Hz; Described the first coefficient of weight is the parameter ratio correspondence 20%, 50% and 30% respectively of output torque, outgoing current and horsepower output; Described the second coefficient of weight is the parameter ratio correspondence 50%, 20% and 30% respectively of output torque, outgoing current and horsepower output.
9. hoisting crane frequency converter according to claim 6, is characterized in that, described default segment frequence curve is the multistage curve of detected value x and frequency f, specifically comprises:
Between idling region: 0<x<A, f=F
r, wherein A is default slack rope coefficient, F
rfor the rated frequency of frequency converter;
Between light loading district: A≤x<B, f=K*F
r, wherein B is default underloading coefficient, K is the weak magnetic multiple of presetting;
Heavy duty is interval: B≤x<C, f=[(F
r-K*F
r)/(C-B)] * (x-B)+K*F
r, wherein C is the permission coefficient of presetting;
Super-heavy load interval: C≤x, f=F
r.
10. hoisting crane frequency converter according to claim 9, is characterized in that, described default slack 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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| CN108750946A (en) * | 2018-05-23 | 2018-11-06 | 四川庞源机械工程有限公司 | A kind of control method that crane load is identified, measures and adjusted |
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| CN103407896A (en) * | 2013-08-28 | 2013-11-27 | 苏州汇川技术有限公司 | Brake time sequence control method of crane and frequency converter |
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| CN105398986A (en) * | 2015-12-23 | 2016-03-16 | 深圳市英威腾电气股份有限公司 | Frequency converter based rope creep protection method and device and hoisting equipment |
| CN105398986B (en) * | 2015-12-23 | 2017-11-07 | 深圳市英威腾电气股份有限公司 | Rope creep protection method, device and crane gear based on frequency converter |
| CN106094914A (en) * | 2016-07-04 | 2016-11-09 | 太原重工股份有限公司 | Straightener main transmission control method and system |
| 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 |
| CN108750946A (en) * | 2018-05-23 | 2018-11-06 | 四川庞源机械工程有限公司 | A kind of control method that crane load is identified, measures and adjusted |
| 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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