CN102589662B - System for measuring mass of heavy object lifted by motor by utilizing motor output power and method thereof - Google Patents

Abstract

The invention discloses a method for measuring mass of a heavy object lifted by a motor by utilizing motor output power. The method comprises the following steps: acquiring data of a heavy object with unknown mass in a lifting process, screening out data of a continuous effective data smooth segment of the motor in stable working with a speed close to a rated rotating speed, calculating total output power of the motor at a continuous position segment, and calculating the mass of the heavy object according to a functional relation obtained in advance between the mass of the heavy object and the total output power of the segment. According to the method and a system provided by the invention, a large error problem in a traditional measuring method can be solved, measurement is not easy to be influenced by an external factor, and a measurement result is comparatively objective.

Description

A kind of system and method that utilizes output power of motor to measure the quality of the weight that motor promotes

Technical field

The present invention relates to the system and method that the quality of motor carrying weight is measured, is a kind of by measuring quality and the method for the weight of various its carryings of parametric synthesis analysis judgement in machine operation concretely.

Background technology

The accurate Calculation of the existing lifting weight by motor-driven hanging device is difficult to realize, usual way is to measure with tension pick-up, the principle of this kind of technology and electronic scale is just the same, adopt strain chip metering system and lever principle, be on sensor, to be subject to exporting a corresponding signal after external force, according to signal relation, measure weight.

Yet the weight recording due to tension pick-up is static weight, and sensor is easily subject to extraneous factor, such as: the interference of the many factors such as vibrations, environment, so measuring accuracy cannot guarantee.In addition, the sensor of common 40T 3t, 5t for hoisting device, the capable of amplifying factors of visible light transducer is very large, and therefore very little interference can produce very large error, and error generally can reach 3% to 5%.

In addition, conventional current method derivation weight quality also in prior art, but due to the existence of the problems such as grid disturbances, may make the electric current measuring undergo mutation, thereby affect the measuring accuracy of these class methods.

Summary of the invention

For solving foregoing problems, the invention provides a kind of method of quality of the lifting heavy of measuring single-phase, three phase alternating current motor, direct current generator, it comprises: the data in the weight lifting process of collection one unknown quality, therefrom filter out near the data of motor continuous valid data smooth section of steady operation rated speed, calculate motor at the gross output of this continuous position section, then calculate weight weight according to the weight quality obtaining in advance and the funtcional relationship of this section of gross output

Concretely, this weight quality obtaining comprises with the acquisition methods of the funtcional relationship of this section of gross output: operating voltage and the motor working current of each phase of motor of a plurality of positions to motor in making to have the weight process of the first quality are sampled; The data that obtain from sampling, filter out the motor operating voltage of every phase, the continuous valid data smooth section of motor working current; According to the smooth section of this working current, operating voltage, calculate motor at the gross output of this valid data smooth section; Change weight lay equal stress on both quality and quantity multiple aforementioned sample, screening and gross output calculating operation; According to the relation of this position section weight quality and gross output, according to conic fitting mode, calculate each parameter of conic fitting.

For solving foregoing problems, another aspect of the present invention also provides a kind of system of utilizing output power of motor to measure the quality of the weight that motor promotes, and it comprises:

Electric moter voltage measuring unit, for obtaining each operating voltage in a plurality of positions of at least part of process of lifting heavy of motor;

Current of electric measuring unit, for obtaining each working current in a plurality of positions of at least part of process of lifting heavy of motor;

Data screening unit, for filtering out working current and the continuous valid data smooth section of operating voltage one of every phase;

Motor promotes output power and calculates unit, for calculating motor in the output power of the continuously smooth section filtering out according to the operating voltage of this each phase, working current;

Alignment unit, it is according to the quality of the first weight, and the gross output of the continuously smooth section that filter out of the weight with the first quality in a lifting process; The quality of the second weight, and the gross output of the continuous effective data smoothing section that filter out of this second quality weight in a lifting process, and the quality of the 3rd weight, and the gross output of the 3rd continuous effective data smoothing section that filter out at lifting process of quality weight, determine an output power of motor counterweight amount quadratic function once, secondary and constant parameter; And,

Weight quality calculation unit, from motor, promote the gross output of weight that gross output computing unit obtains the unknown quality continuously smooth section filtering out hoisting process, by this by the conic fitting that obtains once, secondary and constant parameter obtain the quality of this weight by conic fitting.

Method and system provided by the invention can solve the large problem of error existing in traditional measurement method, and is not vulnerable to the impact of external factor, and measurement result is more objective.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of measuring method of the present invention.

Fig. 2 is the process flow diagram of funtcional relationship method for building up of the present invention.

Fig. 3 is the Organization Chart of system of the present invention.

Fig. 4 is the functional block diagram of system of the present invention.

The curve map of output power of motor in Fig. 5 a kind of embodiment of the present invention, wherein, the green and blue data that represent twice operation.

Fig. 6 is load in a kind of embodiment of the present invention and the matched curve figure of active power.

Embodiment

With reference to the accompanying drawings various embodiments of the present invention are explained.Should be appreciated that this explanation is indicative and non-limiting.

Known according to energy conservation, the power stage that motor provides equals lifting heavy acting and other energy loss sum.And according to applicant, test at the scene the data analysis of collection, and lifting motor is near rated speed during steady operation, and the output power that motor provides becomes certain funtcional relationship f (x) with weight weight.

Therefore, the process of whole calculating weight quality of the present invention is illustrated in figure 1, first gather the data S101 in weight lifting process, therefrom filter out near the continuous data S102 of motor steady operation rated speed, calculate the output power S103 that motor provides at this successive stages, then calculate weight actual weight S104 according to f (x) funtcional relationship of the output power in experimental analysis and weight quality.

The funtcional relationship of the output power of motor and weight quality can be set in the process of system initialization, for example, sets by the following method.

In the preferred experimental example of the present invention, as shown in Figure 2, can carry out promoting early stage this output power by the weight that there is different quality at least three and measure, and the funtcional relationship of derive output power and weight quality.

First for the weight with the first quality, the operating voltage of the every phase of motor of a plurality of continuous positions to motor in the whole process of lifting and the working current S401 that samples;

The data group S402 of a continuous smooth section of the operating voltage u of the every phase while filtering out machine operation and working current i;

Screening to data comprises the following steps: sampling array is selected excellent localization method, search optimal data section, data search location adopts continuous segment to compare and the legal bit data section of absolute difference, locator data Duan Houzai is data and front segment data absolute difference relatively below successively, divide valid data smooth section, get valid data continuous time and active energy cumulative, to average.

According to this data group result, according to P=UaIacos φ+UbIbcos φ+UcIccos φ, wherein P represents active power unit: watt (W), Ux represents voltage, and Ix represents electric current, and Cos φ represents power factor; Calculate motor at the output power S403 of this continuous position;

Change weight quality to the second weight quality and triple amounts and repeat aforementioned sample and output power is calculated operation and obtained, respectively for the output power of the second weight and the output power S404 of the 3rd weight.

Fig. 5 shows while promoting the first weight motor net horsepower (output power) curve over time, promotes, class of a curve is seemingly during second, third weight.

Subsequently, according to conic fitting principle, the quadratic function of definition output power and weight quality, and according to record for the first weight, the second weight and the 3rd weight calculating quadratic function once, secondary and constant parameter S 405.; For example: WG=a*a*P+b*P+c, wherein, WG dead weight capacity (t); A, b, c are respectively secondary, once and fitting of constant parameter.

In a kind of example, actual test load (t) is as shown in table 1 with active power (W) table of comparisons:

Sequence number	Real load (T)	Active power (W)
			1	0	5000
2	1	6300
			3	2	8100
4	3	9300
			5	4	11000
6	5	13500

Fig. 6 shows actual test load (t) and active power (W) quadratic fit curve figure, and the section that wherein approaches straight line is described smooth section.23 seconds to 58 seconds section power is smoother as can be seen from Fig., and this section is optimum data section, can be used for the weight that follow-up measurement is raised weight.

After system initialization has defined, this funtcional relationship can be stored in a storer, prepare against while calculating weight quality in the future and call.

When the weight of the quality an of the unknown is carried out to mass measurement, can be by entering aforesaid method, first to motor, operating voltage and the working current of every phase of a plurality of continuous positions in the whole process of lifting are sampled;

The data group of a continuous valid data smooth section of the voltage u of every phase when same mode filters out machine operation while adopting with initialization and working current i;

Again according to sampled result according to output power P=UaIacos φ+UbIbcos φ+UcIccos φ; Calculate motor in the output power of this continuous position; Finally,

According to the quadratic function of preserving, by the mode of conic fitting, extrapolate the quality of weight.This kind of projectional technique is higher compared with traditional quality precision of evaluating by tension pick-up.

Voltage in the present invention, electric current and rotating speed can pass through corresponding voltage, electric current and speed probe, and for example voltage transformer (VT) summation current transformer 300, by data collecting card 200, are gathered and are obtained.

As shown in Figure 4, can in the software of analytical equipment 100, realize electric moter voltage, electric current, measuring unit 101,102 provides sampled result to data screening unit 20 for signal and each unit of receiver voltage mutual inductor or current transformer 300, the data group of a continuous valid data smooth section of the voltage u of every phase when data screening sieve unit is selected machine operation and working current i, this voltage, electric current are transferred into output power with data group and calculate unit 30 and calculate output power subsequently.Measurement mechanism is being carried out in the program branches of initialization or calibration, this output power is further sent in an alignment unit 40 for calculating the quality of weight and the funtcional relationship of this position section output power; In Er Mass Calculation branch, this output power is further sent to a weight quality judging unit 50 and according to the aforementioned funtcional relationship calculating, calculates weight quality for individual.

Claims (1)

1. utilize output power of motor to measure a system for the quality of the weight that motor promotes, it comprises:

Electric moter voltage measuring unit, for obtaining each operating voltage in a plurality of positions of at least part of process of lifting heavy of motor;

Current of electric measuring unit, for obtaining each working current in a plurality of positions of at least part of process of lifting heavy of motor;

Data screening unit, for filtering out working current and the continuous valid data smooth section of operating voltage one of every phase;

Motor promotes output power and calculates unit, for calculating motor in the output power of the continuously smooth section filtering out according to the operating voltage of this each phase, working current;

Alignment unit, it is according to the quality of the first weight, and the gross output of the continuously smooth section that filter out of the weight with the first quality in a lifting process; The quality of the second weight, and the gross output of the continuous valid data smooth section that filter out of this second quality weight in a lifting process, and the quality of the 3rd weight, and the gross output of the 3rd continuously smooth section that filter out at lifting process of quality weight, determine an output power of motor counterweight amount quadratic function once, secondary and constant parameter; And,

Weight quality calculation unit, from motor, promote the gross output of weight that gross output computing unit obtains the unknown quality continuously smooth section filtering out hoisting process, by this by the conic fitting that obtains once, secondary and constant parameter obtain the quality of this weight by conic fitting.

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