CN203249932U - Device acquiring rotation speed of drive peristaltic pump direct current motor - Google Patents
Device acquiring rotation speed of drive peristaltic pump direct current motor Download PDFInfo
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- CN203249932U CN203249932U CN 201320249535 CN201320249535U CN203249932U CN 203249932 U CN203249932 U CN 203249932U CN 201320249535 CN201320249535 CN 201320249535 CN 201320249535 U CN201320249535 U CN 201320249535U CN 203249932 U CN203249932 U CN 203249932U
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- peristaltic pump
- direct current
- sampling resistor
- pass filter
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Abstract
The utility model provides a device acquiring the rotation speed of a drive peristaltic pump direct current motor, and relates to the field of rotation speed test. According to the device, a loop of a drive peristaltic pump direct current motor control circuit is connected in series with one end of a current sampling resistor; the other end of the current sampling resistor is grounded; the test current of the current sampling resistor presents periodical change signals; one end of a blocking capacitor is connected between the drive peristaltic pump direct current motor control circuit and the current sampling resistor; the other end of the blocking capacitor is connected with a low pass filter; the low pass filter filters out high frequency interference; the low pass filter is connected with a shaping amplifier; the shaping amplifier carries out shaping amplification on the signal; the shaping amplifier is connected with a frequency voltage converter; the frequency voltage converter converts frequency into voltage and carries out output; the frequency voltage converter is connected with a single chip microcomputer; the single chip microcomputer is used for operating the rotation speed data of the drive peristaltic pump direct current motor.
Description
Technical field
The utility model relates to the motor speed detection field, relates in particular to a kind of device that drives the peristaltic pump dc motor speed that obtains.
Background technology
At present, it is must speed sensor and the parts of speed pickup directly must be linked to each other with the rotation axis of direct current generator that the method for known measurement dc motor speed has methods such as using electromagnetic sensing scrambler, Hall element scrambler, photoelectric encoder and test generator, their common feature.And the direct current generator that drives peristaltic pump does not have speed pickup, needs to understand or control the requirement that dc motor speed reaches understanding or control peristaltic pump rotating speed thereby but have in actual use.A kind of method of obtaining the dc motor speed that drives peristaltic pump is researched and developed for satisfying this requirement.
The utility model content
The utility model is intended to solve at least the technical matters that exists in the prior art, has proposed to special innovation a kind of device that drives the peristaltic pump dc motor speed that obtains.This method can be applied to medical treatment, chemical industry, physico-chemical analysis etc. and use direct current generator to drive in the control and monitoring of peristaltic pump device.
In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of device that drives the peristaltic pump dc motor speed that obtains, and comprising: current sampling resistor, driving peristaltic pump DC motor control circuit, capacitance, low-pass filter, shaping amplifier, FV convertor and single-chip microcomputer;
Loop series current sample resistance one end of described driving peristaltic pump DC motor control circuit, described current sampling resistor other end ground connection, described current sampling resistor measuring current presents the cyclical variation signal, be connected capacitance one end between described driving peristaltic pump DC motor control circuit and the current sampling resistor, the described capacitance other end connects low-pass filter, described low pass filter filters out high frequency interference, described low-pass filter is connected with shaping amplifier, described shaping amplifier carries out shaping to signal and amplifies, described shaping amplifier is connected with FV convertor, magnitude of voltage after the described FV convertor output conversion, described FV convertor is connected with single-chip microcomputer, and described single-chip microcomputer is used for the rotary speed data that computing drives the peristaltic pump direct current generator.
The beneficial effect of such scheme is: connect into current sampling resistor Rs in the driving circuit loop at the direct current generator of peristaltic pump, the sample resistance measuring current presents the cyclical variation signal, amplify the acquisition frequency signal through low-pass filtering, shaping, the frequency of utilization voltage changer is transformed into voltage, this magnitude of voltage has reflected the rotating speed of direct current generator, and single-chip microcomputer can be calculated according to this voltmeter the rotating speed of direct current generator.Low-pass filter can filter out high frequency interference, stay useful signal.Shaping amplifier can further be eliminated the little burr of low frequency signal and it is become square wave, has greatly improved signal to noise ratio (S/N ratio).For final the acquisition provides reliable and stable frequency signal for rotary speed data.FV convertor is converted into voltage signal output with frequency signal.
The described device that drives the peristaltic pump dc motor speed that obtains, preferably, described current sampling parts comprise: current sampling resistor and capacitance and between connection, rotor in the driving Peristaltic pump head of driving peristaltic pump DC motor control circuit is when moving a week, the load current that produces is regular cyclical variation, when load is heavy, the drive current that drives the peristaltic pump DC motor control circuit becomes large, when load is light, the drive current that drives the peristaltic pump DC motor control circuit diminishes, described electric current flows through sample resistance and exists, and obtains by capacitance.Become AC signal by sample resistance, capacitance.
The beneficial effect of such scheme is: described cyclical variation of obtaining electric current can drive the peristaltic pump dc motor speed by accurate response, for the final tach signal that obtains provides initialize signal.
The described device that drives the peristaltic pump dc motor speed that obtains, preferably, described single-chip microcomputer comprises: computing module, described computing module rate of connections electric pressure converter, described computing module is electrically connected with single-chip microcomputer, and described computing module is used for the rotary speed data that computing drives the peristaltic pump direct current generator;
V
O＝V
CC×R×C×F；
Fd=K * F is again
Wherein F is the signal frequency of described FV convertor, the supply voltage of FV convertor is Vcc, the pull-up resistor of FV convertor is R, the pump electric capacity of FV convertor is C, FV convertor is output as Vo, the rotating speed of direct current generator is Fd, and K is the constant that depends on peristaltic pump and drive peristaltic pump direct current generator mechanical transmission structure.
The beneficial effect of such scheme is: after the accurate computing of the computing module of single-chip microcomputer, driven accurately the dc motor speed data of peristaltic pump.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are: make in this way, realize the closed-loop control dc motor speed, the rotating speed that also can be used for the monitoring direct current generator whether in claimed range in order to carry out necessary control, structure is very simple.
Additional aspect of the present utility model and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Description of drawings
Above-mentioned and/or additional aspect of the present utility model and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is that the utility model obtains the circuit theory diagrams that drive the peristaltic pump dc motor speed;
Fig. 2 is that the utility model obtains the method flow diagram that drives the peristaltic pump dc motor speed.
Embodiment
The below describes embodiment of the present utility model in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only be for convenience of description the utility model and simplified characterization, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.
In description of the present utility model, unless otherwise prescribed and limit, need to prove that term " installation ", " linking to each other ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly to link to each other, and also can indirectly link to each other by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
As shown in Figure 1, a kind of device that drives the peristaltic pump dc motor speed that obtains comprises: current sampling resistor, driving peristaltic pump DC motor control circuit, capacitance, low-pass filter, shaping amplifier, FV convertor and single-chip microcomputer;
Loop series current sample resistance one end of described driving peristaltic pump DC motor control circuit, described current sampling resistor other end ground connection, described current sampling resistor measuring current presents the cyclical variation signal, be connected capacitance one end between described driving peristaltic pump DC motor control circuit and the current sampling resistor, the described capacitance other end connects low-pass filter, described low pass filter filters out high frequency interference, described low-pass filter is connected with shaping amplifier, described shaping amplifier carries out shaping to signal and amplifies, described shaping amplifier is connected with FV convertor, magnitude of voltage after the described FV convertor output conversion, institute's FV convertor is connected with single-chip microcomputer, and described single-chip microcomputer is used for the rotary speed data that computing drives the peristaltic pump direct current generator.
The beneficial effect of such scheme is: connect into current sampling resistor Rs in the driving circuit loop at the direct current generator of peristaltic pump, the sample resistance measuring current presents the cyclical variation signal, amplify the acquisition frequency signal through low-pass filtering, shaping, the frequency of utilization voltage changer is transformed into voltage, this magnitude of voltage has reflected the rotating speed of direct current generator, and single-chip microcomputer can be calculated according to this voltmeter the rotating speed of direct current generator.
The described device that drives the peristaltic pump dc motor speed that obtains, preferably, described current sampling parts comprise: current sampling resistor and capacitance and between connection, rotor in the driving Peristaltic pump head of driving peristaltic pump DC motor control circuit is when moving a week, the load current that produces is regular cyclical variation, when load is heavy, the drive current that drives the peristaltic pump DC motor control circuit becomes large, when load is light, the drive current that drives the peristaltic pump DC motor control circuit diminishes, described electric current flows through sample resistance and exists, and obtains by capacitance.Become AC signal by sample resistance, capacitance.
The beneficial effect of such scheme is: described cyclical variation of obtaining electric current can drive the peristaltic pump dc motor speed by accurate response, for the final tach signal that obtains provides initialize signal.Low-pass filter can filter out high frequency interference, stay useful signal.Shaping amplifier can further be eliminated the little burr of low frequency signal and it is become square wave, has greatly improved signal to noise ratio (S/N ratio).For final the acquisition provides reliable and stable frequency pulse signal for tach signal.FV convertor is converted into voltage signal output with frequency signal.
The described device that drives the peristaltic pump dc motor speed that obtains, preferably, described single-chip microcomputer comprises: computing module, described computing module rate of connections electric pressure converter, described computing module is electrically connected with single-chip microcomputer, and described computing module is used for the rotary speed data that computing drives the peristaltic pump direct current generator;
V
O＝V
CC×R×C×F；
Fd=K * F is again
Wherein F is the signal frequency of described FV convertor, the supply voltage of FV convertor is Vcc, the pull-up resistor of FV convertor is R, the pump electric capacity of FV convertor is C, FV convertor is output as Vo, the rotating speed of direct current generator is Fd, and K is the constant that depends on peristaltic pump and drive peristaltic pump direct current generator mechanical transmission structure.
The beneficial effect of such scheme is: after the accurate computing by single-chip microcomputer, driven accurately the dc motor speed data of peristaltic pump.
As shown in Figure 2, the utility model also discloses a kind of method that drives the peristaltic pump dc motor speed of obtaining, and comprising:
Step 1 will drive the loop series current sample resistance of peristaltic pump DC motor control circuit, and described current sampling resistor measuring current presents the cyclical variation signal;
Step 2, the variable signal of described current sampling resistor are through behind the capacitance, and with the direct current signal isolation, remaining AC signal sends to low-pass filter;
Step 3, by filtering, the output signal of low-pass filter sends to shaping amplifier at low-pass filter medium-high frequency signal, and described shaping amplifier carries out sending to FV convertor after the shaping amplification with the burr of further filtering low frequency signal and with signal;
Step 4, the magnitude of voltage after the described FV convertor output conversion sends to single-chip microcomputer;
Step 5, the computing module computing of single-chip microcomputer drives the rotary speed data of peristaltic pump direct current generator.
The beneficial effect of such scheme is: connect into current sampling resistor Rs in the driving circuit loop at the direct current generator of peristaltic pump, present the cyclical variation signal from the sample resistance measuring current, obtain frequency signal through capacitance, low-pass filter, shaping amplifier, frequency of utilization-voltage changer is transformed into voltage, this magnitude of voltage has reflected the rotating speed of direct current generator, and single-chip microcomputer is calculated the rotating speed of direct current generator according to this voltmeter.
The described method that drives the peristaltic pump dc motor speed of obtaining is characterized in that described step 1 comprises:
Step 1.1, during one week, the load current that produces is regular cyclical variation to the rotor in the driving Peristaltic pump head of driving peristaltic pump DC motor control circuit in motion;
Step 1.2, when load is heavy, it is large that the drive current of described driving peristaltic pump DC motor control circuit becomes, when load is light, the drive current of described driving peristaltic pump DC motor control circuit diminishes, and the cyclical variation of the electric current of described current sampling resistor is obtained by sample resistance and capacitance.
The beneficial effect of such scheme is: can reliably obtain the current signal that drives the peristaltic pump DC motor control circuit, and simple and reliable, for the final rotary speed data that obtains provides reliable and stable initialize signal.
The described method that drives the peristaltic pump dc motor speed of obtaining is characterized in that described step 5 comprises:
Step 5.1, the computing module of described single-chip microcomputer carries out computing with the magnitude of voltage that obtains,
V
O＝V
CC×R×C×F；
Fd=K * F is again
Wherein F is the signal frequency of described FV convertor, the supply voltage of FV convertor is Vcc, the pull-up resistor of FV convertor is R, the pump electric capacity of FV convertor is C, FV convertor is output as Vo, the rotating speed of direct current generator is Fd, and K is the constant that depends on peristaltic pump and drive peristaltic pump direct current generator mechanical transmission structure.
Step 5.2, the driving peristaltic pump dc motor speed data that obtain after the computing, through obtaining the mean value of described rotary speed data after three samplings, this mean value is for driving the rotating speed of peristaltic pump direct current generator.The needed exact value of number of times User of sampling is determined, is not limited to three times, also can select five times or seven times.
The beneficial effect of such scheme is: the accurately magnitude of voltage that described single-chip microcomputer will get access to carries out the computing of rotating speed, thereby obtains to drive the dc motor speed data of peristaltic pump.
For the direct current generator that overcomes existing driving peristaltic pump does not but have the deficiency that speed pickup can not test speed, the utility model provides a kind of method of obtaining the dc motor speed that drives peristaltic pump.Just make in this way the rotating speed that can under direct current generator does not have the situation of speed pickup, obtain direct current generator.
The technical scheme that its technical matters that solves the utility model adopts is: connect into current sampling resistor Rs in the driving circuit loop at the direct current generator of peristaltic pump, present the cyclical variation signal from the sample resistance measuring current, amplify the acquisition frequency signal through capacitance, low-pass filtering, shaping, frequency of utilization-voltage changer is transformed into voltage, this magnitude of voltage has reflected the rotating speed of direct current generator, and single-chip microcomputer is calculated the rotating speed of direct current generator according to this voltmeter.
Because the rotor in the Peristaltic pump head is in the motion in a week, the load that produces is cyclical variation, the drive current of direct current generator became large when load was heavy, otherwise then diminish, cause the current sampling resistor measuring current to present cyclical variation, this signal is through capacitance, low-pass filter (see figure 1) filtering high frequency interference, then deliver to shaping amplifier and carry out the shaping amplification, signal after the shaping amplifier shaping becomes pulse signal, and pulse signal is added to frequency-voltage converter (FVC) and converts voltage to.If being added to the signal frequency of FVC input end is F, the supply voltage of FVC is Vcc, and the pull-up resistor of FVC is R, and the pump electric capacity of FVC is C, and FVC is output as Vo, and the rotating speed of direct current generator is Fd, then has:
V
O＝V
CC×R×C×F；
Fd＝K×F；
K is a constant that depends on the physical construction of peristaltic pump and direct current generator in the formula.
The direct current generator that drives peristaltic pump is controlled by DC motor control circuit, the sample resistance R s that keeps forging ahead that in the ground loop of motor, connects, and establishing dc motor power voltage is Vc, and electric current is I during the direct current generator normal operation, and current sampling resistor can be chosen by following formula:
By the selected current sampling resistor of above-mentioned formula, can effectively carry out the sampling work of electric current, make the sampling current data stabilization, and improve the validity of the voltage of end reaction motor speed.
Signal on the current sampling resistor through capacitance Ci after only remaining AC signal be added to low-pass filter, at low-pass filter medium-high frequency signal by filtering.The output of low-pass filter is added to shaping amplifier, and the effect of shaping amplifier has 2:
1. the further little burr of filtering low frequency;
2. acquisition pulse;
The output of shaping amplifier is added to frequency-voltage converter (FVC), and the supply voltage of establishing FVC is Vcc, and frequency inverted is become voltage Vo output, and Vo is as previously mentioned:
V
O＝V
CC×R×C×F；
K is the constant that depends on peristaltic pump and drive peristaltic pump direct current generator mechanical transmission structure in the formula.Concrete numerical value can calculate by mechanical drive principle.
1 this direct current generator is without speed pickup, the direct current generator of this driving peristaltic pump is with periodically variable load, the drive current size that this direct current generator flows through is followed load and is cyclical variation, obtains the method for the dc motor speed that drives peristaltic pump by the curent change on the sample resistance.
2 current sampling resistors are connected with direct current generator and are carried out current sampling, use capacitance to separate direct current and obtain AC signal.Use the low pass filter filters out high-frequency signal.
3 use the little burr of the further filtering low frequency of shaping amplifier and obtain pulse.
4 frequencies of utilization-electric pressure converter (FVC) become voltage Vo output with frequency inverted.
5 use the single-chip microcomputer computing to drive the rotary speed data of peristaltic pump direct current generator.
Also can directly use Vo as output signal, this signal can be used as:
1. the Speed display of direct current generator;
2. the speed monitoring of direct current generator, control, warning;
3. the PID closed-loop control of the speed of direct current generator;
Also can use Vo to calculate frequency Fd when certainly needing frequency values.
The beneficial effects of the utility model are, make in this way, can realize the Speed display of direct current generator, realize the closed-loop control dc motor speed, the rotating speed that also can be used for the monitoring direct current generator whether in claimed range in order to carry out necessary control, structure is very simple.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: can carry out multiple variation, modification, replacement and modification to these embodiment in the situation that does not break away from principle of the present utility model and aim, scope of the present utility model is limited by claim and equivalent thereof.
Claims (1)
1. one kind is obtained the device that drives the peristaltic pump dc motor speed, it is characterized in that, comprising: current sampling resistor, driving peristaltic pump DC motor control circuit, low-pass filter, shaping amplifier, FV convertor and single-chip microcomputer;
Loop series current sample resistance one end of described driving peristaltic pump DC motor control circuit, described current sampling resistor other end ground connection, described current sampling resistor measuring current presents the cyclical variation signal, be connected capacitance one end between described driving peristaltic pump DC motor control circuit and the current sampling resistor, the described capacitance other end connects low-pass filter, described low pass filter filters out high frequency interference, described low-pass filter is connected with shaping amplifier, described shaping amplifier carries out shaping to signal and amplifies, described shaping amplifier is connected with FV convertor, magnitude of voltage after the described FV convertor output conversion, described FV convertor is connected with single-chip microcomputer, and described single-chip microcomputer is used for the rotary speed data that computing drives the peristaltic pump direct current generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320249535 CN203249932U (en) | 2013-05-09 | 2013-05-09 | Device acquiring rotation speed of drive peristaltic pump direct current motor |
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| CN 201320249535 CN203249932U (en) | 2013-05-09 | 2013-05-09 | Device acquiring rotation speed of drive peristaltic pump direct current motor |
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| CN203249932U true CN203249932U (en) | 2013-10-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344779A (en) * | 2013-05-09 | 2013-10-09 | 重庆南方数控设备有限责任公司 | Apparatus and method for obtaining rotating speed of direct-current motor for driving peristaltic pump |
| CN109861598A (en) * | 2017-11-30 | 2019-06-07 | 大陆汽车电子(芜湖)有限公司 | System and method for detecting the revolving speed of brushed DC motor |
-
2013
- 2013-05-09 CN CN 201320249535 patent/CN203249932U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344779A (en) * | 2013-05-09 | 2013-10-09 | 重庆南方数控设备有限责任公司 | Apparatus and method for obtaining rotating speed of direct-current motor for driving peristaltic pump |
| CN103344779B (en) * | 2013-05-09 | 2016-02-03 | 重庆南方数控设备有限责任公司 | A kind of apparatus and method obtaining driving peristaltic pump DC motor speed |
| CN109861598A (en) * | 2017-11-30 | 2019-06-07 | 大陆汽车电子(芜湖)有限公司 | System and method for detecting the revolving speed of brushed DC motor |
| CN109861598B (en) * | 2017-11-30 | 2020-12-04 | 纬湃汽车电子(芜湖)有限公司 | System and method for detecting rotation speed of brushed direct current motor |
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Granted publication date: 20131023 Termination date: 20140509 |