CN102701081A - Frequency converter overload protection system and method thereof - Google Patents
Frequency converter overload protection system and method thereof Download PDFInfo
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- CN102701081A CN102701081A CN2012101518822A CN201210151882A CN102701081A CN 102701081 A CN102701081 A CN 102701081A CN 2012101518822 A CN2012101518822 A CN 2012101518822A CN 201210151882 A CN201210151882 A CN 201210151882A CN 102701081 A CN102701081 A CN 102701081A
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Abstract
The invention provides a frequency converter overload protection system, which comprises an output control unit, a torque calculation unit, an output detection unit and an overload protection unit. The output control unit is used for making the frequency converter reach a set operation frequency and operate at the set frequency for specified time when the frequency converter executes a lifting operation; the output detection unit is used for detecting the output voltage and current of the frequency converter; the torque calculation unit is used for calculating the output torque of the frequency converter according to the output voltage and current; and the overload protection unit is used for determining overload and making the frequency converter execute deceleration and stop operations when the output torque exceeds a set maximum output torque, while disabling the lifting command. The invention also provides a corresponding method. According to the invention, frequency converter overload is determined by detecting the torque in uniform speed operation of the frequency converter, to achieve high overload determination accuracy and low cost.
Description
Technical field
The present invention relates to the mechanical and electrical safety field, more particularly, relate to a kind of frequency converter overload protection system and method.
Background technology
At present; Hoisting crane is widely used in occasions such as camp site, harbour, warehouse, workshop; Be used to lift building materials, machinery and equipment, goods etc., its work characteristics is that startup is frequent, hoisting capacity is uncertain, occurs the situation of overload in the course of the work through regular meeting.When overload crane moves, can cause safety misadventure and the parts of hoisting crane are caused damage.For fear of the safety misadventure of hoisting crane, and prolong service life of hoisting crane, need be to the hoisting crane restriction that overloads.For example, the lifting industry all requires to install load limiter on lift system at present.This load limiter spare detects the load that crane lifting mechanism is drawn through mechanical deformation.Export to the overload operation that digital quantity signal of control mechanism is used for limiting crane lifting mechanism according to condition of loading.
Yet above-mentioned load limiter costs an arm and a leg, and many hoisting crane originating firms commercial city uneasiness is adorned or used inferior, lower-cost load limiter, causes the potential safety hazard of hoisting crane ubiquity overload operation on the market like this.In addition, the phenomenon that present domestic lifting industry ubiquity overload is used, even producer uses standard, up-to-standard load limiter, the user is in order to let overload crane operation meeting idea manage to remove the restriction of load limiter to lift system.Based on above two reasons, there is certain defective in mechanical load limiter on the function of restriction overload crane operation, even under a stable condition, can not play any restriction.
Summary of the invention
The technical matters that the present invention will solve is, to the above-mentioned overload crane killer problem that costs an arm and a leg, a kind of frequency converter overload protection system and method is provided.
The technical scheme that the present invention solves the problems of the technologies described above is, a kind of frequency converter overload protection system is provided, and comprises output control unit, torque calculation unit, output detecting unit and overload protection unit; Said output control unit is used for when frequency converter carry out to promote operation, makes frequency converter run to setpoint frequency and in this setpoint frequency operation fixed time; Said output detecting unit is used to detect the output voltage and the electric current of frequency converter; Said torque calculation unit is used for the output torque according to said output voltage and electric current calculating frequency converter; Said overload protection unit is used for when said output torque surpasses the maximum output torque of setting, confirming overload and makes said frequency converter carry out the ramp to stop operation, generates simultaneously and forbids promoting instruction.
In frequency converter overload protection of the present invention system, said system also comprises the sudden stop unit, and the output brake out code is stopped up to frequency converter when being used for confirming overload in said overload protection unit.
In frequency converter overload protection of the present invention system; Said system also comprises promptly transfers the unit, be used for that said frequency converter is carried out and transfer operation and frequency converter transfer torque less than minimum output torque the time remove and forbid promoting instruction.
In frequency converter overload protection of the present invention system, said torque calculation unit calculates the output torque T:T=a * V * I of frequency converter through following formula, and wherein a is a constant, and V is the output voltage of frequency converter, and I is the outgoing current of frequency converter.
In frequency converter overload protection of the present invention system, said setpoint frequency is less than the rated frequency of frequency converter, and the said fixed time is not less than 0.3 second.
The present invention also provides a kind of frequency converter overload protection method, may further comprise the steps:
(a) when frequency converter carry out to promote operation, make frequency converter run to setpoint frequency and in this setpoint frequency operation fixed time;
(b) detect the output voltage and the electric current of frequency converter, and according to the output torque of said output voltage with electric current calculating frequency converter;
(c) judge whether said output torque surpasses the maximum output torque of setting,, generate simultaneously and forbid promoting instruction if then confirm the frequency converter overload and make said frequency converter carry out the ramp to stop operation.
In frequency converter overload protection method of the present invention, said step (c) may further comprise the steps afterwards:
(d1) the output brake out code is stopped up to frequency converter;
(d2) said frequency converter is carried out and transferred operation.
In frequency converter overload protection method of the present invention, said step (d2) may further comprise the steps afterwards:
Whether that (d3) judges frequency converter transfers torque less than minimum output torque, promotes instruction if then remove said forbidding, otherwise returns step (d2).
In frequency converter overload protection method of the present invention, through the output torque T:T=a * V * I of following formula calculating frequency converter, wherein a is a constant in the said step (b), and V is the output voltage of frequency converter, and I is the outgoing current of frequency converter.
In frequency converter overload protection method of the present invention, the setpoint frequency in the said step (a) is less than the rated frequency of frequency converter, and the said fixed time is not less than 0.3 second.
Frequency converter overload protection system and method for the present invention, the torque when traveling at the uniform speed through detecting frequency converter judges whether frequency converter overloads, accuracy rate height and cost that overload is judged are extremely low.The present invention can realize through the software that is integrated into frequency converter, be difficult for being abandoned by manufacturer.
Description of drawings
Fig. 1 is the scheme drawing of frequency converter overload protection first embodiment of system of the present invention.
Fig. 2 is the scheme drawing of frequency converter overload protection second embodiment of system of the present invention.
Fig. 3 is the schematic flow sheet of frequency converter overload protection method first embodiment of the present invention.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1, be the scheme drawing of frequency converter overload protection first embodiment of system of the present invention.In the present embodiment, system comprises output control unit 11, torque calculation unit 13, output detecting unit 12 and overload protection unit 14.Above-mentioned each unit can be realized by the software that is integrated into frequency converter, and utilizes that original hardware device carries out corresponding operating in the frequency converter; Certainly above-mentioned each unit also can adopt the equipment that is independent of frequency converter to realize.
That is: P=F * v (1)
Wherein F is the power that acts on the object, and v is the speed of object operation.
And torque T=torsion F * radius of action R, that is:
F=T/R （2）
Linear velocity v=2 π R * per second rotation speed n, then can derive:
v=πR×N/30 （3）
Wherein N is the per minute rotating speed.Formula (2) and formula (3) substitution formula (1) can be obtained:
P=F*v=T/R×πRN/30=π/30×T×N （4）
Wherein P is a power, and unit is W; T is torque, and unit is Nm; N is the motor speed of per minute, and unit is r/min.If convert the unit of P into kW, then above formula can be derived as:
P×1000=π/30×T×N
30000/3.1415926×P=T×N
9549.297×P=T×N
Finally obtain torque calculation formula: T=9550*P/N (5)
Because motor speed: N=60F/p (p is the motor number of pole-pairs, for example the p=2 of four-stage motor), therefore when output frequency was fixed value, motor speed N also was a fixed value.Thereby only need know that the horsepower output P of frequency converter can obtain the output torque of frequency converter: T=9550 * V * I/N, i.e. T=a * V * I (wherein a=9550/N is constant).
In the maximum output torque that overload protection unit 14 is used for surpass setting at output torque (this value can according to the settings such as rating horsepower of frequency converter) time, confirmed overload and makes frequency converter carry out the ramp to stop operation; Generate simultaneously and forbid promoting instruction, forbid promptly that frequency converter is carried out to promote operation again.
Certainly, in practical application, the power that also can directly travel at the uniform speed through the comparison setpoint frequency judges whether overload with the setting maximum power.
In the said system, to operate the time that accelerates to setpoint frequency and travel at the uniform speed very short because frequency converter is from carry out promoting, so the distance that weight promotes is little, in case find that overload is a ramp to stop, thus potential safety hazard eliminated.When above-mentioned each unit is integrated into frequency converter, need not to increase hardware cost, and be difficult for being abandoned by production firm.
As shown in Figure 2, be the scheme drawing of frequency converter overload protection second embodiment of system of the present invention.This system also comprises sudden stop unit 25 and promptly transfers unit 26 except comprising output control unit 21, torque calculation unit 23, output detecting unit 22 and overload protection unit 24.
The output brake out code was stopped up to frequency converter when sudden stop unit 25 was used for confirming overload in the overload protection unit.Promptly transfer unit 26 be used for that frequency converter is carried out and transfer operation and frequency converter transfer torque less than minimum output torque (weight that promote this moment lands) time remove and forbid promoting instruction, thereby frequency converter can be carried out once more behind loss of weight and promotes the operation and the judgement that overloads.Above-mentionedly transfer torque and carry out to transfer in the operating process at frequency converter and detect in real time, and can directly use formula (5) to calculate.Though the result of calculation of the relative formula of actual torque (5) has error, do not influence weight and land judgement.
As shown in Figure 3, be the diagram of circuit of frequency converter overload protection method first embodiment of the present invention, this method can be realized by software that is integrated into frequency converter or the equipment that is independent of frequency converter, may further comprise the steps:
Step S31: when frequency converter carry out to promote operation, make frequency converter run to setpoint frequency and in this setpoint frequency operation fixed time.At this moment, frequency converter is in the state of traveling at the uniform speed, and its output torque is the torque of this frequency converter pulling load.Above-mentioned setpoint frequency and fixed time all can be set according to actual needs, and less than the rated frequency of frequency converter, the fixed time for example is more than 0.3 second to setpoint frequency usually.
Step S32: detect the output voltage and the electric current of frequency converter, and according to the output torque of output voltage with electric current calculating frequency converter.In this step, specifically can adopt following mode to calculate the output torque T:T=a * V * I of frequency converter, wherein a is a constant, and V is the output voltage of frequency converter, and I is the outgoing current of frequency converter.
Step S33: judge that whether output torque surpasses the maximum output torque of setting, if execution in step S35 then, otherwise execution in step S34.
Step S34: make frequency converter recover normal operation, for example accelerate to rated frequency and carry out corresponding operating.
Step S35: confirm the frequency converter overload and make frequency converter carry out the ramp to stop operation, generate simultaneously and forbid promoting instruction.
After above-mentioned steps S35, also comprise: the output brake out code is stopped up to frequency converter; Frequency converter is carried out transferred operation.Transfer in the operating process in execution,, forbid promoting instruction, thereby frequency converter can be carried out once more behind loss of weight and promotes the operation and the judgement that overloads if then remove through judging transferring torque and whether judging less than minimum output torque whether weight lands of frequency converter.
The above; Be merely the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical personnel of being familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. a frequency converter overload protection system is characterized in that: comprise output control unit, torque calculation unit, output detecting unit and overload protection unit; Said output control unit is used for when frequency converter carry out to promote operation, makes frequency converter run to setpoint frequency and in this setpoint frequency operation fixed time; Said output detecting unit is used to detect the output voltage and the electric current of frequency converter; Said torque calculation unit is used for the output torque according to said output voltage and electric current calculating frequency converter; Said overload protection unit is used for when said output torque surpasses the maximum output torque of setting, confirming overload and makes said frequency converter carry out the ramp to stop operation, generates simultaneously and forbids promoting instruction.
2. frequency converter overload protection according to claim 1 system, it is characterized in that: said system also comprises the sudden stop unit, the output brake out code is stopped up to frequency converter when being used for confirming overload in said overload protection unit.
3. frequency converter overload protection according to claim 2 system; It is characterized in that: said system also comprises promptly transfers the unit, be used for that said frequency converter is carried out and transfer operation and frequency converter transfer torque less than minimum output torque the time remove and forbid promoting instruction.
4. frequency converter overload protection according to claim 1 system; It is characterized in that: said torque calculation unit calculates the output torque T:T=a * V * I of frequency converter through following formula; Wherein a is a constant, and V is the output voltage of frequency converter, and I is the outgoing current of frequency converter.
5. according to each described frequency converter overload protection system among the claim 1-4, it is characterized in that: said setpoint frequency is less than the rated frequency of frequency converter, and the said fixed time is not less than 0.3 second.
6. frequency converter overload protection method is characterized in that: may further comprise the steps:
(a) when frequency converter carry out to promote operation, make frequency converter run to setpoint frequency and in this setpoint frequency operation fixed time;
(b) detect the output voltage and the electric current of frequency converter, and according to the output torque of said output voltage with electric current calculating frequency converter;
(c) judge whether said output torque surpasses the maximum output torque of setting,, generate simultaneously and forbid promoting instruction if then confirm the frequency converter overload and make said frequency converter carry out the ramp to stop operation.
7. frequency converter overload protection method according to claim 6 is characterized in that: said step (c) may further comprise the steps afterwards:
(d1) the output brake out code is stopped up to frequency converter;
(d2) said frequency converter is carried out and transferred operation.
8. frequency converter overload protection method according to claim 7 is characterized in that: said step (d2) may further comprise the steps afterwards:
Whether that (d3) judges frequency converter transfers torque less than minimum output torque, promotes instruction if then remove said forbidding, otherwise returns step (d2).
9. frequency converter overload protection method according to claim 6; It is characterized in that: pass through output torque T:T=a * V * I that following formula calculates frequency converter in the said step (b); Wherein a is a constant, and V is the output voltage of frequency converter, and I is the outgoing current of frequency converter.
10. according to each described frequency converter overload protection method among the claim 6-9, it is characterized in that: the setpoint frequency in the said step (a) is less than the rated frequency of frequency converter, and the said fixed time is not less than 0.3 second.
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| CN201210151882.2A CN102701081B (en) | 2012-05-16 | 2012-05-16 | Frequency converter overload protection system and method thereof |
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| CN201210151882.2A CN102701081B (en) | 2012-05-16 | 2012-05-16 | Frequency converter overload protection system and method thereof |
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| CN102701081B CN102701081B (en) | 2015-06-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103274297A (en) * | 2013-06-04 | 2013-09-04 | 中联重科股份有限公司 | Tower crane lifting control equipment, method and system and tower crane |
| CN104760889A (en) * | 2015-03-20 | 2015-07-08 | 成都千秋科技有限公司 | Control method for constant-moment-arm crane taking vector variable-voltage variable-frequency frequency converter as power supply |
| CN104817018A (en) * | 2015-03-20 | 2015-08-05 | 成都千秋科技有限公司 | Control method for force-variable jib crane using vector voltage-variable frequency-variable frequency converter as power supply |
| CN106495043A (en) * | 2016-12-30 | 2017-03-15 | 四川建设机械（集团）股份有限公司 | Derrick crane mechanism driving system safety guard and method |
| CN110294416A (en) * | 2019-06-24 | 2019-10-01 | 中铁十二局集团有限公司 | Workshop mono beam overhead crane in bridge type control method and device |
| CN111362170A (en) * | 2020-03-31 | 2020-07-03 | 三一海洋重工有限公司 | Control method and device for hanger cable reel and crane |
| WO2024027348A1 (en) * | 2022-08-02 | 2024-02-08 | 中联重科建筑起重机械有限责任公司 | Control method for tower crane, processor, apparatus, and tower crane |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103274297A (en) * | 2013-06-04 | 2013-09-04 | 中联重科股份有限公司 | Tower crane lifting control equipment, method and system and tower crane |
| CN103274297B (en) * | 2013-06-04 | 2015-09-16 | 中联重科股份有限公司 | Tower crane lifting control equipment, method and system and tower crane |
| CN104760889A (en) * | 2015-03-20 | 2015-07-08 | 成都千秋科技有限公司 | Control method for constant-moment-arm crane taking vector variable-voltage variable-frequency frequency converter as power supply |
| CN104817018A (en) * | 2015-03-20 | 2015-08-05 | 成都千秋科技有限公司 | Control method for force-variable jib crane using vector voltage-variable frequency-variable frequency converter as power supply |
| CN104817018B (en) * | 2015-03-20 | 2016-08-24 | 成都千秋科技有限公司 | A kind of variable arm Crane control method with vector variable voltage variable frequency converter as power supply |
| CN104760889B (en) * | 2015-03-20 | 2016-08-24 | 成都千秋科技有限公司 | A kind of determine arm of force Crane control method with vector variable voltage variable frequency converter as power supply |
| CN106495043A (en) * | 2016-12-30 | 2017-03-15 | 四川建设机械（集团）股份有限公司 | Derrick crane mechanism driving system safety guard and method |
| CN110294416A (en) * | 2019-06-24 | 2019-10-01 | 中铁十二局集团有限公司 | Workshop mono beam overhead crane in bridge type control method and device |
| CN111362170A (en) * | 2020-03-31 | 2020-07-03 | 三一海洋重工有限公司 | Control method and device for hanger cable reel and crane |
| WO2024027348A1 (en) * | 2022-08-02 | 2024-02-08 | 中联重科建筑起重机械有限责任公司 | Control method for tower crane, processor, apparatus, and tower crane |
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Effective date of registration: 20160229 Address after: Wuzhong District Wuzhong Economic Development Zone, Suzhou City, Jiangsu province 215000 Wang Xiang Shan Industrial Park Road on the north side of friends Patentee after: Suzhou Huichuan Technology Co.,Ltd. Patentee after: Shenzhen Inovance Technology Co., Ltd. Address before: Wuzhong District Wuzhong Economic Development Zone, Suzhou City, Jiangsu province 215000 Wang Xiang Shan Industrial Park Road on the north side of friends Patentee before: Suzhou Huichuan Technology Co.,Ltd. Patentee before: Suzhou Monarch Control Technology Co., Ltd. Patentee before: Shenzhen Inovance Technology Co., Ltd. |