CN102195557A - Pump motor control method and device - Google Patents
Pump motor control method and device Download PDFInfo
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- CN102195557A CN102195557A CN 201010124707 CN201010124707A CN102195557A CN 102195557 A CN102195557 A CN 102195557A CN 201010124707 CN201010124707 CN 201010124707 CN 201010124707 A CN201010124707 A CN 201010124707A CN 102195557 A CN102195557 A CN 102195557A
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Abstract
The invention relates to the technical field of control of pump motors, is used for solving the problems of high energy consumption and high temperature of the motors in the prior art, and provides a pump motor control method and device. The method comprises the steps of: collecting a proportional pressure valve parameter beta and a proportional flow valve parameter gamma of a pump; obtaining the ratio k1 of the maximum design pressure of a proportional pressure valve to the maximum pressure head of the pump and the ratio k2 of the maximum design dynamic pressure of the proportional flow valve to the maximum dynamic pressure without throttle of the working frequency of the pump, wherein the running rotating speed of the working frequency of a pump motor is omega 0; computing the parameters according to a formula; obtaining the real-time rotating speed omega of an oil pump motor; and driving the motor to work through an electric signal of the real-time rotating speed of the pump motor. The embodiment of the invention has the advantage of reducing the electric energy consumption of the pump motor.
Description
Technical field
The present invention is a kind of pump motor control method and device relevant for pump motor control technology field specifically.
Background technology
Injection molding machine, promptly plastic-injection moulding machine is important industrial machinery.Its function is with after the plastic grain fusion, is injected into mould, passes through pressurize, cools off, deviates from, and obtains required goods.
Because the own characteristic of China's injection molding machine industry, and the restriction of factor such as manufacturing cost, constant displacement pump fluid pressure type injection molding machine still occupies than great share at present, and constant displacement pump fluid pressure type injection molding machine is in the Inherent advantage of aspects such as the fineness of goods, density, and aspect such as technology maturity, manufacturing simplification still has superiority, so its output is still bigger.But a drawback of this type is that power consumption is big, user's use cost height.
For constant displacement pump fluid pressure type injection molding machine, its basic operation principle is: by the motor drives oil pump feed, through proportional pressure valve and proportional flow control valve oil pressure and flow are limited, drive each oil motor with hydraulic oil again, thereby finish the compulsory exercise of each parts.Corresponding parts comprise penetrate platform, folding mould, injection, mode transfer, holder mould, pull and push core, strand tooth, reinforced etc.By computer programming, entire work process is carried out sequential control.
At the status of energy consumption of injection molding machine, have multiple energy-saving scheme in the prior art:
Frequency converter+scaling signal collection, the cardinal principle of this scheme is: according to ratio pressure and ratio flow signal, draw rotating speed of motor, and use Frequency Converter Control, export this rotating speed, make the variable lift of constant displacement pump output.Calculation Method has 2 kinds: the weighted average of (1) pressure power and flow signal; (2) the greater of pressure power and flow signal.The advantage of this scheme is an output smoothing, and noise is little.Shortcoming is: oil pump output be not bigger than normal be exactly less than normal.If bigger than normal, then energy-saving effect is poor; If less than normal, then quality and output all descend, and its reason is, can not make the output of the oil pump actual demand of really fitting.Its underlying cause is the accurate calculating that lacks actual demand, employing be the method for rough estimate, cause the consequence that the product quality descends, output descends easily.
Frequency converter+scaling signal collection+control signal collection, this method mainly is in order to remedy the deficiency of above scheme, that is: can not accurately calculate need with under the situation of rotating speed, introduce the control signal of injection molding machine computer again, judge current which step that actually belongs to, determine whether underspeeding according to current step again.For example, be guaranteed quality, then pressurize section does not underspeed; In order to guarantee output, then injection portion does not underspeed etc.Advantage be control more reasonable.Shortcoming is: (1) wiring is quite loaded down with trivial details, and does not have identical mode of connection for the injection molding machine of different model, the different time limits, and particularly for old injection molding machine, execute-in-place is difficult to; (2) need to use programmable logic controller (PLC) (PLC), cost rises; (3) owing to too complicated, many, the poor reliability in fault point.
Summary of the invention
The present invention just is based on the problems referred to above and proposes, and its purpose is to provide a kind of pump motor control method and device, is used for solving prior art motor power consumption height, the problem that temperature is high.
Embodiments of the invention provide a kind of pump motor control method in order to solve the problems of the technologies described above, and comprise, gather the proportional pressure valve parameter beta and the proportional flow control valve parameter lambda of described pump, and obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0Above-mentioned parameter is utilized formula
Calculate and obtain the real-time rotational speed omega of described Oil pump electrical machinery; Utilize the signal of telecommunication drive motors of the real-time rotating speed of described pump motor to carry out work.
According to the further aspect of the method for the invention embodiment, the dc signal of described proportional pressure valve parameter beta ∈ [0,1A], the dc signal of described proportional flow control valve parameter lambda ∈ [0,1A].
According to another further aspect of the method for the invention embodiment, if described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing then store described ω
0, when calculating the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
According to another further aspect of the method for the invention embodiment, calculate and obtain and also comprise after the real-time rotational speed omega of described pump motor, the real-time rotating speed of described pump motor is revised, on the basis of the real-time rotating speed of pump motor, add a predetermined value.
According to another further aspect of the method for the invention embodiment, comprise that also driving described pump motor keeps a predetermined rotating speed.
The embodiment of the invention also provides a kind of pump motor control device in order to solve the problems of the prior art, comprises collecting unit, the proportional pressure valve parameter beta and the proportional flow control valve parameter lambda that are used to gather described pump; Test cell is used to obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0Computing unit is used for the parameter that above-mentioned collecting unit and test cell obtain is utilized formula
Calculate and obtain the real-time rotational speed omega of described pump motor; Described driver element is used for carrying out work according to the signal of telecommunication drive motors of the real-time rotating speed of described pump motor of described computing unit output.
A further aspect according to device embodiment of the present invention also comprises memory, if be used for described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing then store described ω
0, make when described computing unit calculates the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
Another further aspect according to device embodiment of the present invention also comprises amending unit, is used for the real-time rotating speed of described pump motor is revised.
According to another further aspect of device embodiment of the present invention, described driver element also is used to drive described pump motor and keeps a predetermined rotating speed.
The beneficial effect of the embodiment of the invention is, reduced the power consumption of pump motor (particularly injection molding machine Oil pump electrical machinery), and do not need to introduce new technical problem (for example not needing to monitor current which production process that is in) to mate different motor speeds, logical resource consumes little, and do not need to change the setting of existing injection molding machine, realize simply can also guaranteeing the quality and the production efficiency of product.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the embodiment of the invention, constitutes the application's a part, does not constitute limitation of the invention.In the accompanying drawings:
Shown in Figure 1 is the flow chart of embodiment of the invention pump motor control method;
Figure 2 shows that the structural representation of a kind of pump motor control device of the embodiment of the invention;
Injection molding machine application apparatus of the present invention and correlation method carry out the system construction drawing of Energy Saving Control in the embodiment of the invention shown in Figure 3.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the present invention is described in further details below in conjunction with execution mode and accompanying drawing.At this, exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, but not as a limitation of the invention.
The power consumption of injection molding machine mainly comprises: 1, the power consumption of hydraulic system oil pump; 2, the power consumption of heater; 3, the power consumption of recirculated cooling water pump.Wherein the power consumption of hydraulic oil pump motor accounts for more than 80% of whole injection molding machine power consumption, so reduce the key that its power consumption is injection machine energy-saving.
The energy waste that the hydraulic injection molding machine system produces at work mainly comprises spill losses.
Injection molding machine is adding man-hour, constantly repeats the specified action flow process.But each step on stream, required pressure and flow are inequality, for example required pressure and the flow of injection portion is all bigger, and required pressure and the flow of cooling section is all very little.But when injection molding machine adopted constant displacement pump, oil pump with power frequency (prestissimo) work, pumped the oil of maximum quantity all the time.Because it is oily limited that each step needs, unnecessary oil then passing ratio pressure valve overflow is got back to oil cylinder, in this process, produce a large amount of no-good heat energy, so power consumption is big, oil temperature height, and wherein to account for the proportion of energy waste bigger in spill losses.
Shown in Figure 1 is the flow chart of embodiment of the invention pump motor control method.
Comprise step 101, gather the proportional pressure valve parameter beta and the proportional flow control valve parameter lambda of pump, and obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0Wherein, described pump can comprise the oil pump in the injection molding machine.
In above-mentioned steps 101, the dc signal of described proportional pressure valve parameter beta ∈ [0,1A], the dc signal of described proportional flow control valve parameter lambda ∈ [0,1A].Wherein, β and λ also may exceed the scope of [0,1A], can cut out to exceed part, are 0 or 1, so that the needs of control.
In above-mentioned steps 101, if described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing, for example be 50Hz, then store described ω
0, when calculating the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
Comprise also that in above-mentioned steps 103 the real-time rotating speed signal of telecommunication of described pump motor is enlarged into 0 to 10V the signal of telecommunication and is input in the frequency converter, frequency converter drives described motor and carries out work, makes described pump not export unnecessary lift.
As a further embodiment of the present invention, calculate and obtain in described step 102 and also comprise after the real-time rotational speed omega of described pump motor, the real-time rotating speed of described pump motor is revised, on the basis of the real-time rotating speed of pump motor, add a predetermined value.Because may there be certain error in the data of gathering in real application process, therefore increasing makeover process can not influence quality and output so that the lift of pump output meets the demands as much as possible.
As a further embodiment of the present invention, comprise also described pump motor is kept a predetermined rotating speed that this is because oil pump needs the long period to quicken from static bringing into operation, and therefore takes certain idling, reduce the response time, and reduce impact oil pump.
Thereby the output lift that can control rotating speed of motor realization pump by said method of the present invention more accurately can both be utilized effectively basically, is directed to oil pump especially and has reduced the unnecessary power consumption of motor, has saved the energy.
Be illustrated in figure 2 as the structural representation of a kind of pump motor control device of the embodiment of the invention.
Described collecting unit 201, the proportional pressure valve parameter beta and the proportional flow control valve parameter lambda that are used to gather described pump.
Described test cell 202 is used to obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0Wherein, described pump comprises the oil pump in the injection molding machine.
Described computing unit 203 is used for the parameter that above-mentioned collecting unit 201 and test cell 202 obtain is utilized formula
Calculate, obtain the real-time rotational speed omega of described pump motor.
Described driver element 204 is used for carrying out work according to the signal of telecommunication drive motors of the real-time rotating speed of described pump motor of described computing unit 203 outputs.
As a further embodiment of the present invention, also comprise memory 205, if be used for described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing then store described ω
0, make when described computing unit 203 calculates the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
As a further embodiment of the present invention, described driver element 204 comprises equipment such as frequency converter.
As a further embodiment of the present invention, also comprise amending unit 206, be connected with described driver element 204, be used for the real-time rotating speed of described pump motor is revised, on the basis of the real-time rotating speed of pump motor, add a predetermined value.
As a further embodiment of the present invention, described driver element 204 also is used to drive described pump motor and keeps a predetermined rotating speed.
Pass through the foregoing description, accurately calculated the rotating speed that motor need be used in real time, make the lift of oil pump output can access utilization completely, reach energy-conservation effect, and do not need to introduce new technical problem by said apparatus, improvement cost is not high, and injection molding machine is produced the quality of product and efficient all without any negative effect.
Injection molding machine is used the system construction drawing that apparatus of the present invention and correlation method carry out Energy Saving Control in the embodiment of the invention as shown in Figure 3.
Described control device 301 as above-mentioned shown in Figure 2, do not repeat them here, this control device is gathered the parameter beta of proportional pressure valve 304 and the parameter lambda of proportional flow control valve 305, and obtains the maximum design pressure of proportional pressure valve 304 and the ratio k of oil pump 303 maximum pressure heads
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve 305 does not have throttling with oil pump 303 power frequencies
2, the power frequency operation rotational speed omega of described motor 302
0
This control device 301 utilizes formula with the above-mentioned parameter of obtaining
Calculate, obtain the real-time rotational speed omega of described motor 302, and carry out work according to the signal of telecommunication control motor 302 of the real-time rotating speed of this motor.
Described motor 302 drives described oil pump 303 and carries out work.
Wherein, the method that control device 301 calculates real-time rotating speed is to form according to following analysis, at first according to Bernoulli equation:
E-stagnation pressure wherein; P-static pressure (manometric reading); The pressure that ρ gz-fluid column plumb height produces;
-dynamic pressure; The v-flowing velocity.Because the injection molding machine height is limited, the pressure that oil column causes is very little, thus ρ gz this can ignore, then:
For limit situation, as the value β=1A of proportional pressure valve, the value λ of proportional flow control valve=0A, this moment the static pressure maximum, dynamic pressure is 0, has
P
0＝k
1E
0＝k
1k
3ω
0 2
P wherein
0-maximum static pressure; E
0The maximum pressure head (power frequency operation) of-oil pump; k
1The ratio of the maximum pressure head of the maximum design pressure of-proportional pressure valve and oil pump; ω
0The rotating speed of-power frequency operation; E
0=k
3ω
0 2What describe is the quadratic relationship of the pressure head and the rotating speed of oil pump.
As the value β=0A of proportional pressure valve, the value λ of proportional flow control valve=1A, this moment, static pressure was approximately 0, and dynamic pressure is a maximum, has
D wherein
0The max-Q of-proportional flow control valve design; v
0Peak Flow Rate when-oil pump power frequency operation does not have throttling; k
2The ratio of max-Q when the design maximum dynamic pressure of-proportional flow control valve does not have throttling with the oil pump power frequency.
In the ordinary course of things, when the value of preset proportion pressure valve is β ∈ [0,1A], when the value of proportional flow control valve was λ ∈ [0,1A], in fact the pressure head of Shi Yonging was:
Following formula is in conjunction with E
0=k
3ω
0 2If, use the frequency converter drive motors, establishing to be ω with rotating speed, and will make oil pump export identical pressure head E just, not overflow just then can get ω according to the pressure head of oil pump and the relation of rotating speed
2=(k
1β+k
2λ
2) ω
0 2, then
And, for proportional pressure valve supporting on the same injection molding machine and proportional flow control valve, can be similar to:
k
1=k
2=k≤1, then E=k
3ω
2=k (β+λ
2) E
0, following formula is in conjunction with E
0=k
3ω
0 2, can get ω
2=k (β+λ
2) ω
0 2
Therefore, approximate formula: the need rotating speed that satisfies above-mentioned requirements is:
Wherein constant k can be determined according to the test that selected oil pump and valve carry out limited number of times, sounds out later several times this k value can the storage, and ω
0Equally also can determine to store,, more fast motor be controlled so that directly obtain above-mentioned parameter in the Electric Machine Control afterwards by limited number of time test to motor.
Because above-mentioned control device 301 is when calculating, there are some approximate conditions, so may in real-time control, there be certain error, so described control device 301 can also be revised the real-time rotating speed that calculates after calculating, for example on the basis of the real-time rotating speed that calculates, increase desired speed or reduce desired speed.
And because oil pump needs the long period to quicken from static bringing into operation, therefore described control device 301 can also be exported the idling of a predetermined rotating speed as motor, reducing the response time, and reduces the impact to oil pump.
As the example of concrete parameter, certain injection molding machine is regulated through the several all after dates tests of trial run and is drawn k=0.75, and the power frequency operation rotating speed is 50Hz, and is in service when β=0.8, λ=0.4 o'clock,
Should adopt 50*0.85=42.5 (Hz).According to the cube curve of oil pump power, the power saving rate of this moment is about (1-(42.5/50)
3)/1=38.6%, thus the method and apparatus of the embodiment of the invention can reach very high energy-saving effect, and quality of item and output is without any variation, and the response time can not prolong.Average power saving rate about 35%, motor temperature descends about 5 ℃, and the oil temperature descends about 15 ℃.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a pump motor control method is characterized in that comprising,
Gather the proportional pressure valve parameter beta and the proportional flow control valve parameter lambda of described pump, and obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0
Above-mentioned parameter is utilized formula
Calculate and obtain the real-time rotational speed omega of described Oil pump electrical machinery;
Utilize the signal of telecommunication drive motors of the real-time rotating speed of described pump motor to carry out work.
2. method according to claim 1 is characterized in that, the dc signal of described proportional pressure valve parameter beta ∈ [0,1A], the dc signal of described proportional flow control valve parameter lambda ∈ [0,1A].
3. method according to claim 1 is characterized in that, if described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing then store described ω
0, when calculating the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
4. method according to claim 1 is characterized in that, calculates and obtain also to comprise after the real-time rotational speed omega of described pump motor, and the real-time rotating speed of described pump motor is revised, and adds a predetermined value on the basis of the real-time rotating speed of pump motor.
5. method according to claim 1 is characterized in that, comprises that also driving described pump motor keeps a predetermined rotating speed.
6. a pump motor control device is characterized in that comprising,
Collecting unit, the proportional pressure valve parameter beta and the proportional flow control valve parameter that are used to gather described pump are gone into;
Test cell is used to obtain the maximum design pressure of proportional pressure valve and the ratio k of the maximum pressure head of pump
1, the ratio k of max-Q when the design maximum dynamic pressure of proportional flow control valve does not have throttling with the pump power frequency
2, the power frequency operation rotational speed omega of described pump motor
0
Computing unit is used for the parameter that above-mentioned collecting unit and test cell obtain is utilized formula
Calculate and obtain the real-time rotational speed omega of described pump motor;
Described driver element is used for carrying out work according to the signal of telecommunication drive motors of the real-time rotating speed of described pump motor of described computing unit output.
7. device according to claim 6 is characterized in that, also comprises memory, if be used for described k
1And k
2Close, then make k
1=k
2=k stores this parameter k, if the power frequency operation rotational speed omega of described pump motor
0Fixing then store described ω
0, make when described computing unit calculates the real-time rotating speed of described pump motor, utilize formula
Calculate the real-time rotating speed of described pump motor.
8. device according to claim 6 is characterized in that, also comprises amending unit, is used for the real-time rotating speed of described pump motor is revised, and adds a predetermined value on the basis of the real-time rotating speed of pump motor.
9. device according to claim 6 is characterized in that, described driver element also is used to drive described pump motor and keeps a predetermined rotating speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010124707 CN102195557B (en) | 2010-03-12 | 2010-03-12 | Pump motor control method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010124707 CN102195557B (en) | 2010-03-12 | 2010-03-12 | Pump motor control method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102195557A true CN102195557A (en) | 2011-09-21 |
| CN102195557B CN102195557B (en) | 2013-01-23 |
Family
ID=44603070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010124707 Expired - Fee Related CN102195557B (en) | 2010-03-12 | 2010-03-12 | Pump motor control method and device |
Country Status (1)
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|---|---|---|---|---|
| WO2014206342A1 (en) * | 2013-06-28 | 2014-12-31 | Eaton Corporation | Servo pump control system and method |
| CN104609307A (en) * | 2014-12-30 | 2015-05-13 | 大连维乐液压制造有限公司 | Multi-purpose crane hydraulic system |
| CN110165964A (en) * | 2019-06-10 | 2019-08-23 | 爱科赛智能科技（台州）有限公司 | A kind of intelligent control method and its control device exchanging immersible pump |
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| US20020096219A1 (en) * | 2000-11-10 | 2002-07-25 | Rosewood Equipment Company | Utility conservation control methodology within a fluid pumping system |
| US20030039556A1 (en) * | 2001-08-22 | 2003-02-27 | Pumpenfabrik Ernst Vogel | Process for determining a reference characteristic for controlling a pump |
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| WO2014206342A1 (en) * | 2013-06-28 | 2014-12-31 | Eaton Corporation | Servo pump control system and method |
| US10458403B2 (en) | 2013-06-28 | 2019-10-29 | Eaton Intelligent Power Limited | Servo pump control system and method |
| CN104609307A (en) * | 2014-12-30 | 2015-05-13 | 大连维乐液压制造有限公司 | Multi-purpose crane hydraulic system |
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|---|---|
| CN102195557B (en) | 2013-01-23 |
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