CN110013920A - For eliminating the precision centrifuge method for controlling number of revolution of the revolving speed error of indication - Google Patents
For eliminating the precision centrifuge method for controlling number of revolution of the revolving speed error of indication Download PDFInfo
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- CN110013920A CN110013920A CN201910430478.0A CN201910430478A CN110013920A CN 110013920 A CN110013920 A CN 110013920A CN 201910430478 A CN201910430478 A CN 201910430478A CN 110013920 A CN110013920 A CN 110013920A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
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Abstract
The invention discloses a kind of for eliminating the precision centrifuge method for controlling number of revolution of the revolving speed error of indication, specially a kind of to adjust rotary speed instruction numerical value by accurate timing to eliminate the precision centrifuge method for controlling number of revolution of the revolving speed error of indication.The invention is based on the precise measurement to precision centrifuge actual speed, the pulse signal with different duty is converted from single set point signal by the rotary speed instruction sent to servo-driver, by the duty ratio of height numerical value in accurate adjustment instruction signal, realize that centrifuge actual speed approaches desired revolving speed.The present invention, which is equivalent to, improves the rotary speed instruction recognition resolution of servo-driver, can make the revolving speed error of indication of precision centrifuge reduces by 2 orders of magnitude, to reach technical indicator required by highest class of accuracy i.e. 0.0001 grade precision centrifuge specified in JJG 1066-2011 " precision centrifuge vertification regulation ".
Description
Technical field
The present invention relates to precision centrifuge applied technical fields more particularly to a kind of for eliminating the essence of the revolving speed error of indication
Close centrifugal basket speed control method.
Background technique
Precision centrifuge is to generate high-precision, high stability, Gao Chongli centrifugal field environment by high-precision centrifugal rotation
Inertial navigation device calibration equipment.Revolving speed output accuracy is the core index that precision centrifuge realizes high-precision centrifugal field environment,
This index is presented as that revolving speed indicating value is missed in national metrological verification regulations JJG1066-2011 " precision centrifuge vertification regulation "
Difference --- the relative standard deviation i.e. between centrifuge speed real output value and target value.The revolving speed indicating value of precision centrifuge is missed
Difference is needed lower than its acceleration accuracy class an order of magnitude.
The rotation speed servo control of precision centrifuge mostly uses servo-driver to directly control mode, i.e. servo-driver now
Rotating speed of target instruction is received, its internal revolving speed is passed through --- centrifuge speed is watched in the realization of torque double closed loop structure
Clothes control.Digital signal interface is generally used to promote transmission accuracy and stability, the servo-driver of rotating speed of target instruction
Rotary speed instruction is received, the transmitted bit digit by digital signal limited, and servo-driver is inevitable to the identification of rotary speed instruction
There are resolution limits.In accurate centrefuge experiment, centrifuge speed corresponding to aimed acceleration generally all will not just position
In on these revolving speed discrete points, this will generate the inevitable revolving speed error of indication, in turn result in precision centrifuge output and accelerate
The error of indication of degree, so as to cause the class of accuracy that can not further promote precision centrifuge.
Therefore servo-driver is limited to the recognition resolution of rotary speed instruction, traditional precision centrifuge is only at higher turn
The lower revolving speed error of indication could be obtained under the conditions of speed.For example, use rotary speed instruction recognition resolution for 0.001rpm's
When S700 series of servo driver, other disturbing factors are not considered, the real work revolving speed of centrifuge is relative to rotating speed of target meeting
Generate the revolving speed deviation of maximum 0.0005rpm.To the revolving speed error of indication is reduced to 1 × 10-5With meet 0.01 grade of precision from
The technical requirement of scheming, it is necessary to make the working speed of centrifuge be greater than 50rpm, and because of the work g value of precision centrifuge
Lower limit cannot generally be greater than 1g, according to centrifuge acceleration formula a=ω2(a is the output acceleration of centrifuge to R, and ω is
Centrifuge working speed, R are centrifuge working radius), it is known that the working radius of precision centrifuge cannot be greater than 357mm at this time,
This will seriously limit the scale size and application effect of precision centrifuge.
With the further promotion of precision centrifuge class of accuracy, it is necessary to increase the working speed of centrifuge on year-on-year basis, together
When by the working radius of centrifuge with inverse square relationship reduction.Precision clearly for class of accuracy at 0.01 grade or more
For centrifuge, the technology path that single rotary speed instruction is directly controlled is directed to using servo-driver, will be unable to be expired
The revolving speed error of indication of sufficient technical requirement.
Summary of the invention
The object of the invention is that provide a kind of for eliminating the essence of the revolving speed error of indication to solve the above-mentioned problems
Close centrifugal basket speed control method.
To achieve the goals above, the disclosure provides a kind of precision centrifuge revolving speed control for reducing the revolving speed error of indication
Method processed, the servo drive system based on precision centrifuge are realized, comprising the following steps:
S1: rotating speed of target value ω is calculated according to the target g value of accurate centrefuge experiment, rotating speed of target value ω refers to as revolving speed
Order is issued to servo-driver, drives precision centrifuge to operate to rotating speed of target ω, jumps S2；
S2: fixed point pulse signal complete cycle of increment type Circular gratings is accessed into high-precision frequency meter, high-precision frequency meter obtains
Pulse frequency f is obtained, unit: Hz, according to calculation formula ωi=60 × f obtains mean speed ω complete cycle of centrifugei, unit:
Rpm jumps S3；
S3: Measurement &control computer persistently obtains the ω of precision centrifuge from high-precision frequency meteri, and continuously remembered in a manner of queue
10 ω of address book storedi, continuous 10 ω are calculated according to the following formulaiCorresponding precision centrifuge revolving speed relative standard uncertainty with
The revolving speed error of indication:
The calculation formula of precision centrifuge revolving speed relative standard uncertainty λ are as follows:
(1) in formula,For the mean value of continuous 10 complete cycles of mean speed,
The calculation formula of the precision centrifuge revolving speed error of indication are as follows:
(2) in formula, ε is precision centrifuge revolving speed error of indication absolute value, and in (3) formula, δ is precision centrifuge revolving speed indicating value
Error relative value, jumps S4；
S4: judging whether λ is less than class of accuracy an order of magnitude of precision centrifuge, judges whether ε is less than servo drive
The rotary speed instruction recognition resolution res of dynamic device, jumps S5 if being to be if the two judging result, otherwise jumps S3；
S5: judging whether δ is less than class of accuracy an order of magnitude of precision centrifuge, if the determination result is YES then jumps
Otherwise S12 jumps S6；
S6: establishing a timing cycle program in Measurement &control computer, and the timing cycle that the program is arranged is centrifuge
Swing circle T=60/ ω, unit: s, and each timing cycle of the program is divided further into the suitable of two accurate timings
Sequence execution part, fixed time interval are respectively T1 and T2, set T1=T2=T/2 as the initial value of T1, T2, are executed using sequence
The part T1 sends revolving speed revision directive ω+Δ1, the part T2 executed using sequence sends revolving speed revision directive ω+Δ2, jump
S7；
S7: calculating the ratio X of ε and res, jump S8 if 0 X≤1/3 <, if 1/3 X≤2/3 < jumps S9, if 2/3
< X < 1 then jumps S10；
S8: setting T1=0.5 (1-X) T, T2=0.5 (1+X) T, whenWhen, set Δ1=res, Δ2=-res,
WhenWhen, set Δ1=-res, Δ2=res, jumps S11；
S9: setting T1=XT, T2=(1-X) T, whenWhen, set Δ1=-res, Δ2=0, when When,
Set Δ1=res, Δ2=0, jump S11；
S10: setting T1=0.5XT, T2=(1-0.5X) T, whenWhen, set Δ1=-2res, Δ2=0, whenWhen, set Δ1=2res, Δ2=0, jump S11；
S11: Measurement &control computer empties the storage result to precision centrifuge mean speed complete cycle, again in a manner of queue
Stored, newly obtain complete cycle mean speed storage quantity reach 10 after calculate and averagely turn this 10 complete cycles
The corresponding precision centrifuge revolving speed error of indication relative value δ Δ of speed；Judge whether δ Δ is less than the class of accuracy of precision centrifuge
An order of magnitude if the determination result is YES then jumps S12, otherwise jumps S3；
S12: precision centrifuge revolving speed error of indication amendment process terminates, and exports experimental result.
The beneficial effects of the present invention are:
1, the present invention relates to a kind of for eliminating the precision centrifuge method for controlling number of revolution of the revolving speed error of indication, this method base
In the precise measurement to precision centrifuge actual speed, the rotary speed instruction sent to servo-driver is turned from single set point signal
The pulse signal with different duty is turned to, by the duty ratio of height numerical value in accurate adjustment instruction signal, realizes centrifugation
Machine actual speed approaches desired revolving speed；
2, it is equivalent to for eliminating the precision centrifuge method for controlling number of revolution of the revolving speed error of indication and improves servo-driver
Rotary speed instruction recognition resolution, can make precision centrifuge the revolving speed error of indication reduce by 2 orders of magnitude, to reach
Highest class of accuracy i.e. 0.0001 grade precision centrifuge institute specified in JJG1066-2011 " precision centrifuge vertification regulation "
It is required that technical indicator.
Detailed description of the invention
Attached drawing is and to constitute part of specification for providing further understanding of the disclosure, with following tool
Body embodiment is used to explain the disclosure together, but does not constitute the limitation to the disclosure.In the accompanying drawings:
Fig. 1 is of the present invention for eliminating the precision centrifuge method for controlling number of revolution flow chart of the revolving speed error of indication；
Fig. 2 is of the present invention for eliminating the knot that the precision centrifuge method for controlling number of revolution of the revolving speed error of indication is related to
Structure block diagram.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the disclosure.It should be understood that this place is retouched
The specific embodiment stated is only used for describing and explaining the disclosure, is not limited to the disclosure.
As shown in Figure 1, the present invention relates to a kind of precision centrifuge method for controlling number of revolution for reducing the revolving speed error of indication,
Servo drive system based on precision centrifuge is realized, comprising the following steps:
S1: rotating speed of target value ω is calculated according to the target g value of accurate centrefuge experiment, rotating speed of target value ω refers to as revolving speed
Order is issued to servo-driver, drives precision centrifuge to operate to rotating speed of target ω, jumps S2.
Reduction formula between target g value and rotating speed of target value ω are as follows:
G=r × 11.18 × 10-6×ω2
In formula, the unit of ω is rpm, and the unit of g is g, and r is effectively to be centrifuged radius, i.e., from centrifuge axle center to centrifuge tube
The length at bucket bottom, unit cm.
The rotary speed instruction of rotating speed of target value ω is transmitted directly to servo-driver by Measurement &control computer in a manner of digital command.
S2: fixed point pulse signal complete cycle of increment type Circular gratings is accessed into high-precision frequency meter, high-precision frequency meter obtains
It obtains pulse frequency f (unit: Hz), according to calculation formula ωi=60 × f obtains mean speed ω complete cycle of centrifugei(unit:
Rpm), S3 is jumped.
Increment type Circular gratings should be able to export fixed point pulse signal complete cycle, therefore increment type Circular gratings are directly nested in centrifugation
On owner's axis, i.e. the output period of fixed point pulse signal should be identical as the swing circle of centrifuge system.
There is the high-precision frequency meter of corresponding Measurement Resolution according to the selection of the class of accuracy of precision centrifuge system, it is high
The Measurement Resolution of precision frequency meter should be higher than that two orders of magnitude of class of accuracy of precision centrifuge.For example, for 0.001 grade
Precision centrifuge system, Ying Xuanyong resolution ratio be at least up to 7 half high-precision frequency meter carry out centrifuge system complete cycle
Mean speed measurement.
S3: Measurement &control computer persistently obtains the ω of precision centrifuge from high-precision frequency meteri, and continuously remembered in a manner of queue
10 ω of address book storedi, continuous 10 ω are calculated according to the following formulaiCorresponding precision centrifuge revolving speed relative standard uncertainty with
The revolving speed error of indication:
The calculation formula of precision centrifuge revolving speed relative standard uncertainty λ are as follows:
(1) in formula,For the mean value of continuous 10 complete cycles of mean speed,
The calculation formula of the precision centrifuge revolving speed error of indication are as follows:
(2) in formula, ε is precision centrifuge revolving speed error of indication absolute value, and in (3) formula, δ is precision centrifuge revolving speed indicating value
Error relative value, jumps S4.
High-precision frequency meter should have the communication interface with Measurement &control computer cooperation, high-precision frequency meter and Measurement &control computer
Signal connection, can be uploaded to automatically Measurement &control computer to the measurement result of each centrifuge system swing circle.
The inspection of Measurement &control computer revolving speed error of indication according to specified in JJG1066-2011 " precision centrifuge vertification regulation "
Determine method, centrifuge speed and revolving speed are shown based on the centrifuge system swing circle measurement result obtained by high-precision frequency meter
Value error is calculated.
Measurement &control computer carries out rotary speed instruction with revolving speed error of indication calculated result according to centrifuge speed continual
Accurate timing adjustment, i.e., the rotary speed instruction that Measurement &control computer is sent to servo-driver will be converted to height from single numeric form
The impulse form of numerical value accurate timing.
S4: judging whether λ is less than class of accuracy an order of magnitude of precision centrifuge, judges whether ε is less than servo drive
The rotary speed instruction recognition resolution res of dynamic device, jumps S5 if being to be if the two judging result, otherwise jumps S3.
S5: judging whether δ is less than class of accuracy an order of magnitude of precision centrifuge, if the determination result is YES then jumps
Otherwise S12 jumps S6.
S6: establishing a timing cycle program in Measurement &control computer, and the timing cycle that the program is arranged is centrifuge
Swing circle T=60/ ω (unit: s), and each timing cycle of the program is divided further into the suitable of two accurate timings
Sequence execution part, fixed time interval are respectively T1 and T2, set T1=T2=T/2 as the initial value of T1, T2, are executed using sequence
The part T1 sends revolving speed revision directive ω+Δ1, the part T2 executed using sequence sends revolving speed revision directive ω+Δ2, jump
S7。
The timing accuracy of Measurement &control computer should be at least up to 1ms.
S7: calculating the ratio X of ε and res, jump S8 if 0 X≤1/3 <, if 1/3 X≤2/3 < jumps S9, if 2/3
< X < 1 then jumps S10.
S8: setting T1=0.5 (1-X) T, T2=0.5 (1+X) T, whenWhen, set Δ1=res, Δ2=-res；
WhenWhen, set Δ1=-res, Δ2=res, jumps S11.
S9: setting T1=XT, T2=(1-X) T, whenWhen, set Δ1=-res, Δ2=0；When When,
Set Δ1=res, Δ2=0, jump S11.
S10: setting T1=0.5XT, T2=(1-0.5X) T, whenWhen, set Δ1=-2res, Δ2=0；WhenWhen, set Δ1=2res, Δ2=0, jump S11.
S11: Measurement &control computer empties the storage result to precision centrifuge mean speed complete cycle, again in a manner of queue
Stored, newly obtain complete cycle mean speed storage quantity reach 10 after calculate and averagely turn this 10 complete cycles
The corresponding precision centrifuge revolving speed error of indication relative value δ of speedΔ；Judge δΔWhether the class of accuracy one of precision centrifuge is less than
A order of magnitude if the determination result is YES then jumps S12, otherwise jumps S3.
S12: precision centrifuge revolving speed error of indication amendment process terminates, and exports experimental result.
If desired the accurate centrefuge experiment for continuing other target g values, then directly test since S2.
As shown in Fig. 2, inputting Measurement &control computer according to the centrifuge rotating speed of target that object of experiment g value obtains；Observing and controlling calculates
Machine sends rotary speed instruction to servo-driver；Servo-driver makes servo motor work to servo motor feed drive electric current；It watches
Taking motor work makes centrifuge principal axis rotary motion, and the increment type Circular gratings photoelectric encoder being arranged on centrifuge principal axis is to servo
Driver feedback implements revolving speed, and sends fixed point pulse complete cycle signal to high-precision frequency meter；High-precision frequency meter is to observing and controlling
Computer feeds back mean speed complete cycle indicating value.
Wherein Measurement &control computer, servo-driver, servo motor, increment type Circular gratings photoelectric encoder, high-precision frequency
The equipment such as meter are the reference instrument equipment of related fields.For the precision centrifuge system of different scales size and class of accuracy
System, selected instrument and equipment should meet corresponding accuracy class, technical requirement.
Further, the principal element for influencing system performance is as follows: precision centrifuge minimum working speed ωmin(unit:
Rpm), precision centrifuge maximum functional rotational speed omegamax(unit: rpm), precision centrifuge rotating speed of target ω (unit: rpm), observing and controlling
The rotary speed instruction recognition resolution res of the timing accuracy t (unit: s) of computer, servo-driver.
Specifically, ωmin≤ω≤ωmax。
Corresponding system main performance index is as follows:
Complete the shortest time of a revolving speed error of indication makeover process:(unit: s)；
Revolving speed error of indication theory absolute value after completing makeover process:(unit: rpm)；
Revolving speed error of indication theory relative value after completing makeover process:
The present invention carries out exact numerical to the rotating speed of target instruction of precision centrifuge in a manner of accurate timing and adjusts to eliminate
The precision centrifuge revolving speed error of indication；According to centrifuge rotating speed of target, the centrifuge reality obtained by high-precision frequency meter measurement
Complete cycle mean speed, servo-driver rotary speed instruction recognition resolution, to adjustment rotating speed of target instruction timing cycle into
Row accurate quantification calculates；It is put down practical complete cycle according to centrifuge rotating speed of target, the centrifuge obtained by high-precision frequency meter measurement
The rotary speed instruction recognition resolution of equal revolving speed, servo-driver carries out accurate quantification meter to the numerical value adjustment of rotating speed of target instruction
It calculates.
Using of the present invention for eliminating the accurate centrifugation of the revolving speed error of indication in traditional precision centrifuge system
Machine method for controlling number of revolution can make 10-8(Measurement &control computer uses timing accuracy for 1ms's to the revolving speed relative error of indicating value of magnitude
Windows system) meet 0.0001 grade of class of accuracy precision centrifuge index request.
Using of the present invention for eliminating the accurate centrifugation of the revolving speed error of indication in traditional precision centrifuge system
Machine method for controlling number of revolution has the advantage for needing that increased hardware configuration is few, realization difficulty is low, is wanted in the art of this patent method
Asking configuration Measurement &control computer, servo-driver, servo motor is the necessary core component of precision centrifuge system, is not needed additional
Addition.And high-precision frequency meter, increment type Circular gratings are precision tachometric survey components commonly used by precision centrifuge system, generally
It can also continue to use.
Using of the present invention for eliminating the accurate centrifugation of the revolving speed error of indication in traditional precision centrifuge system
Machine method for controlling number of revolution, by selecting the Measurement &control computer with higher timing accuracy (such as to replace Windows component computer
For RT real-time system computer), it can further eliminate the revolving speed relative error of indicating value of precision centrifuge system.
The preferred embodiment of the disclosure is described in detail in conjunction with attached drawing above, still, the disclosure is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the disclosure, a variety of letters can be carried out to the technical solution of the disclosure
Monotropic type, these simple variants belong to the protection scope of the disclosure.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the disclosure to it is various can
No further explanation will be given for the combination of energy.
In addition, any combination can also be carried out between a variety of different embodiments of the disclosure, as long as it is without prejudice to originally
Disclosed thought equally should be considered as disclosure disclosure of that.
Claims (8)
1. for reducing the precision centrifuge method for controlling number of revolution of the revolving speed error of indication, the servo-drive system based on precision centrifuge
System is realized, it is characterised in that: the following steps are included:
S1: rotating speed of target value ω is calculated according to the target g value of accurate centrefuge experiment, ω is as under rotary speed instruction for rotating speed of target value
It is dealt into servo-driver, drives precision centrifuge to operate to rotating speed of target ω, jumps S2；
S2: fixed point pulse signal complete cycle of increment type Circular gratings is accessed into high-precision frequency meter, high-precision frequency meter obtains arteries and veins
Frequency f is rushed, unit: Hz, according to calculation formula ωi=60 × f obtains mean speed ω complete cycle of centrifugei, unit: rpm is jumped
Turn S3；
S3: Measurement &control computer persistently obtains the ω of precision centrifuge from high-precision frequency meteri, and continuously record is deposited in a manner of queue
Store up 10 ωi, continuous 10 ω are calculated according to the following formulaiCorresponding precision centrifuge revolving speed relative standard uncertainty and revolving speed
The error of indication:
The calculation formula of precision centrifuge revolving speed relative standard uncertainty λ are as follows:
(1) in formula,For the mean value of continuous 10 complete cycles of mean speed,
The calculation formula of the precision centrifuge revolving speed error of indication are as follows:
(2) in formula, ε is precision centrifuge revolving speed error of indication absolute value, and in (3) formula, δ is the precision centrifuge revolving speed error of indication
Relative value jumps S4；
S4: judging whether λ is less than class of accuracy an order of magnitude of precision centrifuge, judges whether ε is less than servo-driver
Rotary speed instruction recognition resolution res, jump S5 if being to be if the two judging result, otherwise jump S3；
S5: judging whether δ is less than class of accuracy an order of magnitude of precision centrifuge, if the determination result is YES then jumps S12,
Otherwise S6 is jumped；
S6: establishing a timing cycle program in Measurement &control computer, and the timing cycle that the program is arranged is the rotation of centrifuge
Cycle T=60/ ω, unit: s, and the sequence that each timing cycle of the program is divided further into two accurate timings is held
Row part, fixed time interval are respectively T1 and T2, set T1=T2=T/2 as the initial value of T1, T2, the portion T1 executed using sequence
Revolving speed revision directive ω+Δ is sent in distribution1, the part T2 executed using sequence sends revolving speed revision directive ω+Δ2, jump S7；
S7: the ratio X of ε and res is calculated, S8 is jumped if 0 X≤1/3 <, if 1/3 X≤2/3 < jumps S9, if 2/3 < X <
1 jumps S10；
S8: setting T1=0.5 (1-X) T, T2=0.5 (1+X) T, whenWhen, set Δ1=res, Δ2=-res, whenWhen, set Δ1=-res, Δ2=res, jumps S11；
S9: setting T1=XT, T2=(1-X) T, whenWhen, set Δ1=-res, Δ2=0, when When, setting
Δ1=res, Δ2=0, jump S11；
S10: setting T1=0.5XT, T2=(1-0.5X) T, whenWhen, set Δ1=-2res, Δ2=0, when
When, set Δ1=2res, Δ2=0, jump S11；
S11: Measurement &control computer empties the storage result to precision centrifuge mean speed complete cycle, is carried out in a manner of queue again
Storage, newly obtain complete cycle mean speed storage quantity reach 10 after calculate this 10 complete cycle mean speed pair
The precision centrifuge revolving speed error of indication relative value δ Δ answered；Judge whether δ Δ is less than class of accuracy one of precision centrifuge
The order of magnitude if the determination result is YES then jumps S12, otherwise jumps S3；
S12: precision centrifuge revolving speed error of indication amendment process terminates, and exports experimental result.
2. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: the Measurement Resolution of the high-precision frequency meter of selection is higher than two orders of magnitude of class of accuracy of precision centrifuge.
3. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: the increment type Circular gratings that can export fixed point pulse signal complete cycle are nested on centrifuge principal axis, i.e., fixed point pulse is believed
Number the output period it is identical as the swing circle of centrifuge system.
4. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: high-precision frequency meter is connect with Measurement &control computer signal.
5. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: the timing accuracy of Measurement &control computer is at least 1ms.
6. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: Measurement &control computer is based on the centrifuge system swing circle measurement result obtained by high-precision frequency meter to centrifuge speed
It is calculated with the revolving speed error of indication.
7. the precision centrifuge method for controlling number of revolution according to claim 1 for reducing the revolving speed error of indication, feature
Be: in S1, rotary speed instruction is sent to servo-driver by Measurement &control computer in a manner of digital command.
8. the precision centrifuge method for controlling number of revolution according to claim 7 for reducing the revolving speed error of indication, feature
Be: Measurement &control computer carries out rotary speed instruction according to centrifuge speed and revolving speed error of indication calculated result continual accurate
Timing adjustment, i.e. Measurement &control computer are converted to height numerical value essence to the rotary speed instruction that servo-driver is sent from single numeric form
Impulse form when determining.
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| CN113702705A (en) * | 2021-08-17 | 2021-11-26 | 中国工程物理研究院总体工程研究所 | Phase synchronization measurement system and measurement method for double-shaft precision centrifuge |
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