CN101943633A - Measurement method for mechanical loss and fixed rotary inertia of driving system - Google Patents
Measurement method for mechanical loss and fixed rotary inertia of driving system Download PDFInfo
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- CN101943633A CN101943633A CN 201010298574 CN201010298574A CN101943633A CN 101943633 A CN101943633 A CN 101943633A CN 201010298574 CN201010298574 CN 201010298574 CN 201010298574 A CN201010298574 A CN 201010298574A CN 101943633 A CN101943633 A CN 101943633A
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Abstract
The invention discloses a measurement method for mechanical loss and fixed rotary inertia of a driving system, comprising the following steps of: setting a measurement parameter of measuring the mechanical loss; collecting data of measuring the mechanical loss; processing the data of measuring the mechanical loss to acquire the mechanical loss; setting a measurement parameter of measuring the rotary inertia; collecting data of measuring the rotary inertia; and processing the data of measuring the rotary inertia to acquire the fixed rotary inertia. The method can successfully measure the mechanical loss and the fixed rotary inertia and can be completed without an operator and has the advantages of short measurement time, high measurement efficiency and high measurement precision.
Description
Technical field
The present invention relates to Iron and Steel Production technology technology, particularly a kind of kinematic train mechanical loss and fixing method for measuring rotary inertia.
Background technology
Handle in the control of line at steel industry, the kinematic train mechanical loss and fixedly moment of inertia be the key parameter that influences the Tension Control precision.At present steel industry handle the kinematic train mechanical loss of line and fixedly the measurement of moment of inertia mainly adopt by experiment, manual type reads the related data that is obtained, carry out Calculation Method according to mathematical formulae then and finish, Measuring Time is long, and efficiency of measurement is low, measuring accuracy is low.
Therefore, be necessary to provide a kind of improved kinematic train mechanical loss and fixedly method for measuring rotary inertia overcome the defective of prior art.
Summary of the invention
The purpose of this invention is to provide a kind of kinematic train mechanical loss and fixing method for measuring rotary inertia, need not manually to finish, and Measuring Time is short, efficiency of measurement height, measuring accuracy height.
To achieve these goals, the invention provides a kind of kinematic train mechanical loss and fixing method for measuring rotary inertia, comprise the steps: the measurement parameter of setting measurement mechanical loss, comprise speed setting value, stable state stand-by period and the Measuring Time corresponding with described speed setting value; The control motor moves with described speed setting value, when described motor reaches described setting speed setting value, waiting for that the stable state corresponding with described setting speed setting value is after the stand-by period, collect the number of scan period and the actual torque value of each scan period, the duration of collection is and the corresponding Measuring Time of described setting speed setting value; The actual torque value of all scan periods is added up, and the accumulated value of actual torque is the mechanical loss corresponding with described speed setting value with the merchant of the number of described scan period.
In one embodiment of the invention, the speed setting value of setting can be for a plurality of, and each speed setting value is provided with corresponding stable state stand-by period and Measuring Time.
In another embodiment of the present invention, a plurality of speed setting values of described setting are all speed setting values in full speed degree interval, then, described method also comprises: each speed setting value and corresponding mechanical loss are carried out related, obtain the mechanical loss curve in full speed degree interval.
In another embodiment of the present invention, described method also comprises: the measurement parameter of setting measurement moment of inertia, comprise the measurement number of times, stand-by period between the lifting speed, the maximum speed value of measuring, the minimum speed value of measuring, fixing acceleration setting value, and the stand-by period between twice measurement, the PLC controller is according to the maximum speed value of setting, the minimum speed value, the acceleration setting value, and the stand-by period between twice measurement determine single measurement speed setting value curve, according to the measurement number of times of setting, stand-by period between the lifting speed, and the single measurement speed setting value curve of determining is determined general speed setting value curve; The control motor is with described general speed setting value curve motion, in motor operation course, monitor the instantaneous velocity setting value of motor and the instantaneous velocity value of feedback corresponding in real time with described instantaneous velocity setting value, when the difference of described instantaneous velocity setting value and described instantaneous velocity value of feedback is not more than 10 rev/mins, collect number, the actual torque value of each scan period and the angular acceleration of scan period, and search the mechanical loss value corresponding with described instantaneous velocity setting value according to the mechanical loss curve in described full speed degree interval; Calculate the moment of inertia of each scan period according to actual torque value, angular acceleration and the mechanical loss value of described each scan period, the moment of inertia of all scan periods added up obtains the moment of inertia accumulated value, and the merchant of the number of described moment of inertia accumulated value and described scan period is the moment of inertia mean value between measurement zone.
Compared with prior art, kinematic train mechanical loss of the present invention and fixedly the advantage of moment of inertia method be:
1.PLC (Programmable Logic Controller) controller passes through the Frequency Converter Control motor rotation according to preset parameters, automatically measurement kinematic train mechanical loss and fixedly moment of inertia, can measure multiple devices simultaneously, Measuring Time is short, efficiency of measurement height, measuring accuracy height;
2. in measurement mechanical loss with fixedly adopt the output of fixed slope speed setting value in the process of moment of inertia, and guarantee that the feedback speed of motor and the difference between the setting speed are within certain scope, collection period with a few tens of milliseconds, read measurement data fast and dense, calculate its mean value, improved the measuring accuracy of moment of inertia.。
By following description also in conjunction with the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is kinematic train mechanical loss of the present invention and the fixing control system block diagram that relates to of moment of inertia method.
Fig. 2 is kinematic train mechanical loss of the present invention and fixing moment of inertia method employed general speed setting value curve of being exported by PLC when measuring fixedly moment of inertia.
Fig. 3 is the kinematic train mechanical loss of the present invention and the fixing process flow diagram of moment of inertia method measurement mechanical loss.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
In explanation kinematic train mechanical loss of the present invention with fixedly before the detailed process of moment of inertia method, explanation kinematic train mechanical loss and the fixedly measuring principle of moment of inertia method earlier.
In kinematic train, the output torque T of motor
DCan be expressed as:
T
D＝T
e+T
f+T
d+T
w (1)
In the formula, T
eFor with the mechanical loss torque of velocity correlation, T
fBe the torque that the fixedly moment of inertia relevant with velocity variations needs, T
dBe the torque that the variable rotational inertia relevant with velocity variations needs, T
wBe operation torque.
When kinematic train is unloaded, the torque T that the variable rotational inertia relevant with velocity variations needs
dWith operation torque T
wBe 0, the output torque T of motor
DEqual mechanical loss torque T with velocity correlation
eThe torque T that needs with the fixedly moment of inertia relevant with velocity variations
fAnd:
T
D＝T
e+T
f； (2)
In the formula, the torque T that the fixedly moment of inertia relevant with velocity variations needs
fEqual fixedly moment of inertia J and angular acceleration
Product:
Can get by formula (2), (3):
Can get by formula (4):
When motor operated in constant rotational speed, angular acceleration equalled zero, promptly
Mechanical loss torque T with velocity correlation
eEqual the output torque T of motor
D, measure the output torque T of motor by frequency converter with the PLC controller
D, can obtain mechanical loss torque T with velocity correlation
e
When motor during, measure the output torque T of motor by frequency converter with the PLC controller in acceleration and deceleration
D, measure angular acceleration with the PLC controller
And the mechanical loss torque T of velocity correlation
eWhen motor operates in constant rotational speed, measure earlier, can calculate fixedly moment of inertia J according to formula (5).
As Fig. 1, the control system of this method comprises PLC controller 200, communication network, HMI (HumanMachine Interface) 100, frequency converter 300, and the motor 400 of driving arrangement rotation.The PLC controller is connected with HMI, frequency converter respectively by communication network, and frequency converter is connected with motor.The PLC controller sends to frequency converter by communication network with the general speed setting curve, and frequency converter is by the operation of speed setting curve controlled motor.HMI is used for monitoring the running status of PLC controller, and passes through the running status of PLC controller monitoring frequency converter and motor.
The following describes the kinematic train mechanical loss of the present invention and the fixing detailed process of method for measuring rotary inertia.
As Fig. 3, kinematic train mechanical loss measuring method of the present invention comprises the steps:
Step S1, the measurement parameter of setting measurement mechanical loss comprises the mechanical loss measurement point, and the speed setting value of corresponding described mechanical loss measurement point, stable state stand-by period, Measuring Time;
Step S2, the PLC controller is by the speed setting value operation of Frequency Converter Control motor according to the mechanical loss measurement point of step S1 setting, when motor reaches the speed setting value corresponding with described mechanical loss measurement point, waiting for that the stable state corresponding with described mechanical loss measurement point is after the stand-by period, number and each scan period that the PLC controller is collected the scan period (are the assurance measuring accuracy, scan period is set at 20 milliseconds) actual torque value, the duration of collecting is and the corresponding Measuring Time of described mechanical loss measurement point, after collecting end, the PLC controller adds up the actual torque value of all scan periods, and the number of the accumulated value of actual torque value and scan period is stored in the PLC storer;
Step S3, the PLC controller according to be stored in actual torque in the PLC storer accumulated value and the number calculating mean value of scan period, this mean value is the mechanical loss under this speed setting value, computing formula is as follows:
Mechanical loss=actual torque the number of accumulated value/scan period
As seen from the above, this method can be measured the mechanical loss under a certain speed setting value.
Be appreciated that ground, the present invention can set other mechanical loss measurement points in step S1, and corresponding other speed setting values of setting, and obtains the mechanical loss of corresponding described other speed setting value.
In addition, the present invention also can set all speed setting values in full speed degree interval, and obtain the mechanical loss corresponding with all speed setting values, then according to trace-point method, draw out the interval corresponding mechanical loss curve of full speed degree, like this, in actual moving process, just can obtain the mechanical loss value corresponding with any one speed setting value.
Continue as Fig. 3, kinematic train of the present invention fixedly method for measuring rotary inertia also comprises the steps:
Step S4, the measurement parameter of setting measurement moment of inertia, comprise and measure number of times (n), stand-by period between the lifting speed (Tw), the maximum speed value of measuring (Vmax), minimum speed value of measuring (Vmin) and fixing acceleration setting value (a), stand-by period between twice measurement (Tu), the PLC controller is according to the maximum speed value of setting (Vmax), minimum speed value (Vmin), acceleration setting value (a), and the stand-by period between twice measurement (Tu) determine single measurement speed setting value curve, according to the measurement number of times of setting (n), stand-by period between the lifting speed (Tw), and the single measurement speed setting value curve of determining determines general speed setting value curve, general speed setting value curve as shown in Figure 2:
Wherein: Δ T=Δ T1=Δ T2
Step S5, the PLC controller by the Frequency Converter Control motor according to the general speed setting value curve motion that in step S4, obtains, in motor operation course, the PLC controller is monitored instantaneous velocity setting value and the instantaneous velocity value of feedback corresponding with described instantaneous velocity setting value in real time, when the difference of described instantaneous velocity setting value and described instantaneous velocity value of feedback is not more than 10 rev/mins, the PLC controller is collected number, the actual torque value T of each scan period (for guaranteeing measuring accuracy, the scan period is set at 20 milliseconds) of scan period
DAnd angular acceleration
, and search the mechanical loss value T corresponding with described instantaneous velocity setting value according to the interval corresponding mechanical loss curve of full speed degree as previously mentioned
e, the PLC controller is the actual torque value T of the number of scan period, each scan period
D, angular acceleration
And mechanical loss value T
eBe stored in the PLC storer, when the difference of described instantaneous velocity setting value and described instantaneous velocity value of feedback during greater than 10 rev/mins, measuring process is unusual, and the PLC controller stops to collect;
Step S6, the PLC controller is according to the actual torque value T that is stored in each scan period in the PLC storer
d, angular acceleration
And mechanical loss value T
eUtilize formula (5) to calculate the moment of inertia J of each scan period, simultaneously the moment of inertia J of all scan periods is added up and obtain the moment of inertia accumulated value, calculate moment of inertia mean value between measurement zone according to the number that is stored in the scan period in the PLC storer and moment of inertia accumulated value, computing formula is as follows:
The number of moment of inertia mean value=moment of inertia accumulated value/scan period
Because non-constant, the angular acceleration of mechanical friction of kinematic train
With actual torque value T
DMeasurement have error, the measured value of the moment of inertia J of each scan period may have small difference, therefore, the merchant of the number of moment of inertia accumulated value and scan period is the measured value of moment of inertia.
As seen from the above, this method can be measured the fixedly moment of inertia under a certain speed.
Kinematic train mechanical loss of the present invention and fixedly the advantage of moment of inertia method be:
1.PLC controller by the Frequency Converter Control motor rotation, is measured kinematic train mechanical loss and fixing moment of inertia according to preset parameters automatically, can measure multiple devices simultaneously, Measuring Time is short, efficiency of measurement height, measuring accuracy height;
2. in measurement mechanical loss with fixedly adopt the fixing speed setting value curve of accekeration in the process of moment of inertia, the instantaneous velocity value of feedback of assurance motor and the difference between the instantaneous velocity setting value are within certain scope, collection period with a few tens of milliseconds, measurement data is collected on fast and dense ground, calculating mean value has improved the measuring accuracy of moment of inertia.
Above invention has been described but the present invention is not limited to the embodiment of above announcement in conjunction with most preferred embodiment, and should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (4)
1. a kinematic train mechanical loss and fixedly method for measuring rotary inertia comprise the steps:
The measurement parameter of setting measurement mechanical loss comprises speed setting value, stable state stand-by period and the Measuring Time corresponding with described speed setting value;
The control motor moves with described speed setting value, when described motor reaches described setting speed setting value, waiting for that the stable state corresponding with described setting speed setting value is after the stand-by period, collect the number of scan period and the actual torque value of each scan period, the duration of collection is and the corresponding Measuring Time of described setting speed setting value;
The actual torque value of all scan periods is added up, and the accumulated value of actual torque is the mechanical loss corresponding with described speed setting value with the merchant of the number of described scan period.
2. kinematic train mechanical loss as claimed in claim 1 and fixing method for measuring rotary inertia is characterized in that the speed setting value of setting can be for a plurality of, and each speed setting value is provided with corresponding stable state stand-by period and Measuring Time.
3. kinematic train mechanical loss as claimed in claim 2 and fixing method for measuring rotary inertia is characterized in that a plurality of speed setting values of described setting are all speed setting values in full speed degree interval,
Then, described method also comprises:
Each speed setting value and corresponding mechanical loss are carried out related, obtain the mechanical loss curve in full speed degree interval.
4. kinematic train mechanical loss as claimed in claim 3 and fixing method for measuring rotary inertia is characterized in that, also comprise:
The measurement parameter of setting measurement moment of inertia, comprise the measurement number of times, stand-by period between the lifting speed, the maximum speed value of measuring, the minimum speed value of measuring, fixing acceleration setting value, and the stand-by period between twice measurement, the PLC controller is according to the maximum speed value of setting, the minimum speed value, the acceleration setting value, and the stand-by period between twice measurement determine single measurement speed setting value curve, according to the measurement number of times of setting, stand-by period between the lifting speed, and the single measurement speed setting value curve of determining is determined general speed setting value curve;
The control motor is with described general speed setting value curve motion, in motor operation course, monitor the instantaneous velocity setting value of motor and the instantaneous velocity value of feedback corresponding in real time with described instantaneous velocity setting value, when the difference of described instantaneous velocity setting value and described instantaneous velocity value of feedback is not more than 10 rev/mins, collect number, the actual torque value of each scan period and the angular acceleration of scan period, and search the mechanical loss value corresponding with described instantaneous velocity setting value according to the mechanical loss curve in described full speed degree interval;
Calculate the moment of inertia of each scan period according to actual torque value, angular acceleration and the mechanical loss value of described each scan period, the moment of inertia of all scan periods added up obtains the moment of inertia accumulated value, and the merchant of the number of described moment of inertia accumulated value and described scan period is the moment of inertia mean value between measurement zone.
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| CN2010102985743A CN101943633B (en) | 2010-09-30 | 2010-09-30 | Measurement method for mechanical loss and fixed rotary inertia of driving system |
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| CN2010102985743A CN101943633B (en) | 2010-09-30 | 2010-09-30 | Measurement method for mechanical loss and fixed rotary inertia of driving system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500629A (en) * | 2011-11-22 | 2012-06-20 | 东北大学 | Method for measuring rotational inertia of transmission system |
| CN103162902A (en) * | 2011-12-19 | 2013-06-19 | 上海市特种设备监督检验技术研究院 | Test system of transmission inertia of rotating body |
| CN104980078A (en) * | 2014-04-04 | 2015-10-14 | 广东美的制冷设备有限公司 | Measurement method of motor rotational inertia, measurement device of motor rotational inertia and motor control system |
| CN104980079A (en) * | 2014-04-04 | 2015-10-14 | 广东美的制冷设备有限公司 | Measurement method of motor rotational inertia, measurement device of motor rotational inertia and motor control system |
| CN108195512A (en) * | 2017-12-26 | 2018-06-22 | 顺丰科技有限公司 | A kind of unmanned plane motor method for measuring rotary inertia and measuring device |
| CN110411659A (en) * | 2019-08-21 | 2019-11-05 | 苏州轻工电机厂有限公司 | A kind of motor method for measuring rotary inertia |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102500629A (en) * | 2011-11-22 | 2012-06-20 | 东北大学 | Method for measuring rotational inertia of transmission system |
| CN102500629B (en) * | 2011-11-22 | 2013-12-25 | 东北大学 | Method for measuring rotational inertia of transmission system |
| CN103162902A (en) * | 2011-12-19 | 2013-06-19 | 上海市特种设备监督检验技术研究院 | Test system of transmission inertia of rotating body |
| CN104980078A (en) * | 2014-04-04 | 2015-10-14 | 广东美的制冷设备有限公司 | Measurement method of motor rotational inertia, measurement device of motor rotational inertia and motor control system |
| CN104980079A (en) * | 2014-04-04 | 2015-10-14 | 广东美的制冷设备有限公司 | Measurement method of motor rotational inertia, measurement device of motor rotational inertia and motor control system |
| CN104980079B (en) * | 2014-04-04 | 2018-03-27 | 广东美的制冷设备有限公司 | The measuring method and measurement apparatus and electric machine control system of the rotary inertia of motor |
| CN104980078B (en) * | 2014-04-04 | 2018-09-11 | 广东美的制冷设备有限公司 | The measurement method and measuring device and electric machine control system of the rotary inertia of motor |
| CN108195512A (en) * | 2017-12-26 | 2018-06-22 | 顺丰科技有限公司 | A kind of unmanned plane motor method for measuring rotary inertia and measuring device |
| CN110411659A (en) * | 2019-08-21 | 2019-11-05 | 苏州轻工电机厂有限公司 | A kind of motor method for measuring rotary inertia |
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| CN101943633B (en) | 2012-05-09 |
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Application publication date: 20110112 Assignee: GENERAL ELECTRIC (WUHAN) AUTOMATION Co.,Ltd. Assignor: WUHAN IRON AND STEEL (GROUP) Corp. Contract record no.: 2014420000069 Denomination of invention: Measurement method for mechanical loss and fixed rotary inertia of driving system Granted publication date: 20120509 License type: Exclusive License Record date: 20140508 |
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