WO2013161399A1 - 排気ポンプの堆積物検知装置及び排気ポンプ - Google Patents
排気ポンプの堆積物検知装置及び排気ポンプ Download PDFInfo
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- WO2013161399A1 WO2013161399A1 PCT/JP2013/056246 JP2013056246W WO2013161399A1 WO 2013161399 A1 WO2013161399 A1 WO 2013161399A1 JP 2013056246 W JP2013056246 W JP 2013056246W WO 2013161399 A1 WO2013161399 A1 WO 2013161399A1
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- motor current
- current value
- exhaust pump
- average
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/02—Multi-stage pumps
- F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
- F04D19/042—Turbomolecular vacuum pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2220/00—Application
- F04C2220/30—Use in a chemical vapor deposition [CVD] process or in a similar process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/86—Detection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2280/00—Arrangements for preventing or removing deposits or corrosion
- F04C2280/02—Preventing solid deposits in pumps, e.g. in vacuum pumps with chemical vapour deposition [CVD] processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
Definitions
- the present invention relates to an exhaust pump deposit detection device and an exhaust pump, and more particularly, to an exhaust pump that can detect an exhaust pump maintenance time by detecting deposits in an exhaust pump used in a process such as etching.
- the present invention relates to a deposit detection device and an exhaust pump.
- an exhaust pump P shown in FIG. 8 is used as means for exhausting gas discharged from a process apparatus such as etching to the outside.
- the exhaust pump P has a rotating body R composed of a cylindrical portion 1 and a blade portion 2, and the rotating body R is rotationally driven around the rotor shaft 3 by a motor M.
- Gas molecules located on the side of the intake port 4 of the exhaust pump P are transferred to the upstream side of the screw groove portion 5 by being given a downward momentum by the rotating blade portion 2, compressed by the screw groove portion 5, and then discharged to the exhaust port. 6 is exhausted to the outside.
- Patent Document 1 discloses a method of detecting a product accumulated in the pump (also referred to as “pump deposit”). This detection method detects the current value of the motor that rotates the rotor blade in the turbo molecular pump, compares the detected motor current value with a preset current value, and as a result, the detected motor current value is In this method, the maintenance time is notified when the preset current value is equal to or greater than a preset current value (see paragraph 0022 and the like in the document 1).
- the deposit of the product is detected based on a preset current value, and therefore, the deposit cannot be accurately detected in a process that does not support the preset current value.
- the exhaust pump is used in the process that uses the flow and type of gas.
- the set current value has to be changed, and there is a problem that it takes a long time and costs.
- the present inventors have created a pseudo product deposition state in the S part of the gas flow path, and investigated the relationship between the product deposition and the current change in the motor M of the exhaust pump P. (See FIG. 9). As a result, as shown in FIG. 10, the motor current value becomes conspicuous from the point when the deposition thickness of the deposit in the pump exceeds 50% of the gas flow path (see the product deposition ratio of 50% in FIG. 9). It confirmed that it changed in the increasing direction.
- the thickness of the deposit in the pump where the motor current value starts to rise is not 50% in all models, but varies depending on the design. Also, for example, as shown in FIGS. 10 and 11, when the flow rate of the gas flowing through the exhaust pump P is small as in the operating condition 1 of the exhaust pump P (the B gas is supplied at 800 sccm), the motor current value changes. Since the rate decreases, an increase in the motor current value cannot be determined significantly.
- the motor current value also changes depending on the individual difference of the exhaust pump P and the pop temperature when the gas flows at the same flow rate (see FIG. 12). For this reason, in order to determine significantly the increase in the motor current value, the motor current increase ( ⁇ I) of at least 10% or more is required.
- the present applicant proposes a method for estimating the degree of product deposition by monitoring the value of the motor current flowing during the process.
- the present invention has been proposed to achieve the above object, and the invention according to claim 1 is a deposit detection device for an exhaust pump that exhausts gas by a rotating operation of a rotating body, wherein the rotating body is A means for detecting a motor current value of a motor to be rotated; a current value storage unit for storing only the motor current value equal to or greater than a set value among the motor current values in a steady rotation mode; and the current value storage unit.
- An average value calculation unit that calculates an average value per unit time of the stored motor current value; an average value storage unit that stores the average value calculated by the average value calculation unit; and
- the storage current average values stored in the average value storage unit are arranged in time series, an approximate line calculation unit for obtaining a primary approximation line for the storage current average value, and a predicted motor current value calculated using the primary approximation line;
- Use of the exhaust pump A difference value calculation unit that obtains a difference value from the initial motor current value at the start, and configured to determine a time when the difference value exceeds a preset threshold as a maintenance time of the exhaust pump
- a deposit detection device for an exhaust pump is provided.
- a primary approximation line is obtained for the average value of the motor current values equal to or greater than the set value, and a difference value between the predicted motor current value based on the primary approximation line and the initial motor current value of the exhaust pump is obtained. And the time when this difference value exceeds the threshold value is determined as the maintenance time of the exhaust pump.
- the present invention automatically estimates the maintenance time by predicting the degree of product accumulation only by capturing changes in the motor current.
- the motor current value detected in the steady rotation mode is detected except for a period until the motor current value once becomes sufficiently small after the acceleration mode of the exhaust pump ends.
- the deposit detection device for an exhaust pump according to claim 1 is provided.
- the set value of the motor current value is as large as possible within a range in which at least one data including the maximum value (peak current value) of the motor current value can be acquired in each process.
- a deposit detection device for an exhaust pump according to claim 1 or 2 is provided.
- the invention according to claim 4 is characterized in that the threshold value of the difference value of the motor current value is determined according to the accumulation state of the products of the individual exhaust pumps.
- a deposit detection device for a pump is provided.
- the threshold value of the difference value of the motor current value is determined separately in consideration of the accumulation state of the products of the individual exhaust pumps. Therefore, even when the product deposition speed differs for each exhaust pump, it is determined whether or not the difference value of the motor current value exceeds the threshold value based on the deposition speed.
- an exhaust pump comprising the exhaust pump deposit detection device according to any one of the first to fourth aspects.
- the accumulation state of the product in the exhaust pump can be ascertained without causing burdens such as installation of gas flowing equipment and addition / change of the operation mode of the apparatus. Maintenance time can be easily estimated.
- the average value is not calculated using individual data. Therefore, the motor current value is not affected by the extremely small motor current value.
- the average value can be calculated.
- the motor current value storing process which is effective data is executed only during the time when the motor current value in the steady rotation mode of the exhaust pump is stabilized, the effect of the first aspect of the invention is achieved.
- the maximum motor current value that flows in the motor driver immediately after the end of the acceleration mode of the pump operation can be ignored.
- the invention according to claim 5 can be easily implemented without causing burdens such as installation of gas flowing equipment, addition or change of the operation mode of the apparatus, and even in a situation where the motor current value is extremely small such as during standby.
- an exhaust pump capable of accurately calculating the average value of the motor current value without being affected by the influence is obtained.
- FIG. 9 is an explanatory diagram of a state in which a product deposition state in the gas flow path in the exhaust pump of FIG. 8 is simulated, a) a state when the product deposition ratio is 25%, and b) a ratio thereof. Is a state when the ratio is 50%, and c) is a diagram showing the state when the ratio is 75%.
- FIG. 9 is an explanatory diagram of a state in which a product deposition state in the gas flow path in the exhaust pump of FIG. 8 is simulated, a) a state when the product deposition ratio is 25%, and b) a ratio thereof. Is a state when the ratio is 50%, and c) is a diagram showing the state when the ratio is 75%.
- FIG. 9 is an explanatory diagram of a state in which a product deposition state in the gas flow path in the exhaust pump of FIG. 8 is simulated, a) a state when the product deposition ratio is 25%, and b) a ratio thereof. Is a state when
- FIG. 10 is an explanatory diagram of the relationship between the product deposition ratio and the motor current when the exhaust pump of FIG. 8 is operated under the situation where the pseudo deposit of FIG. 9 exists and the motor current of the exhaust pump is measured.
- the relation between the product accumulation ratio and the motor current when the exhaust pump of FIG. 8 is operated under the conditions 2 and 3 of FIG. 10 and the motor current of the exhaust pump is measured will be described.
- Figure. Explanatory drawing which illustrates the change pattern of the motor current at the time of the process of an exhaust pump. The figure which showed the mode of the change of the motor electric current value at the time of process execution and health check mode execution.
- Explanatory drawing which shows the method of comparing the peak value of the motor current per unit time.
- the present invention is intended to achieve the object of providing an exhaust pump deposit detection device that can be easily implemented without causing burdens such as installation of a gas flow facility and addition / change of the operation mode of the device.
- a current value storage unit that stores only the motor current value greater than or equal to a set value, an average value calculation unit that calculates an average value per unit time of the motor current value stored in the current value storage unit,
- An average value storage unit for storing the average value calculated by the average value calculation unit, and further arranging the storage current average values stored in the average value storage unit in chronological order, the storage current average value First order approximation
- the peak value of the motor current in a short time is searched, for example, when the standby time of the pump operation (including the no-load operation time) is long, the peak value of the motor current is almost the same. It may be zero. For this reason, the change width of the peak value of the motor current becomes large and is not practical.
- a method of storing the peak value of the motor current can be mentioned.
- the motor current value that is larger than the motor current value at the time of process is unexpected in the normal rotation mode.
- the motor current value is stored, and the change in the motor current value cannot be accurately detected.
- a method of taking an average of all motor current values is also conceivable (see the average value of all currents and the first-order approximation line of the one-dot chain line in FIG. 3).
- the motor current value may become extremely small during standby of the pump operation, and it becomes difficult to accurately grasp the product deposition state.
- the present invention can eliminate the drawbacks of the method (comparative example) for capturing changes in the motor current value, and adopts only the motor current value larger than a predetermined value as effective data.
- a method for accurately calculating the average value of the current values is proposed.
- the method for calculating the motor current value according to the present invention is a kind of method for comparing the motor current value per short time, and adopts only valid data that exceeds a predetermined value as the motor current value to be compared.
- the average value is calculated according to the accumulation state of the product.
- the motor current value that flows for a predetermined time immediately after the end of the acceleration mode is not Shall be ignored.
- the predetermined time after the end of the acceleration mode is a time until the motor current value once settles to a sufficiently small value in consideration of the motor current value that flows immediately after the end of the acceleration mode.
- the following excellent merits can be obtained by using the average value of the motor current values equal to or larger than the predetermined value employed in the operation mode.
- the motor current value does not exceed a predetermined value during standby or the like, the average value is not calculated using the motor current value. For this reason, even when the motor current value, which is effective data, is extremely small, such as during operation standby, the average value is not affected by the calculation. That is, an improvement effect with respect to the total current averaging method can be obtained.
- the reference value of the effective motor current value is set to be equal to or larger than the motor current value having a magnitude that is easily affected by the product accumulation state shown in FIG.
- the motor current data can be significantly compared under a condition in which the motor current value varies greatly depending on the product deposition state.
- FIGS. 1 to 7 The relationship between the accumulation of products in the exhaust pump and the change in current of the motor of the exhaust pump is the same as that described in the background art.
- the product accumulates in the gas flow path (S part) below the rotor 1.
- the pressure in the lower part of the turbine section 2 at the lowest stage of the exhaust pump P increases.
- the motor current value is controlled to change in the increasing direction.
- the change in the motor current value is used as means for detecting the degree of product accumulation. For this reason, it is assumed that there is no change in the gas load pattern during the process of the end user. If the gas type and the gas flow rate flowing through the exhaust pump are constant, as shown in FIG. 10, the motor current value also increases as the degree of product accumulation increases.
- the gas type and gas flow rate flowing to the exhaust pump are not as important as the left, and it is important that the gas load pattern applied to the exhaust pump is constant.
- the motor current value will be the pump temperature and gas temperature in the short term.
- the motor current value gradually changes depending on the product deposition state in the long term, although it is considered that the value slightly changes every time for various reasons such as the gas flow rate.
- the pump load is not always applied. For example, a situation where no load is applied between processes, that is, a situation where a motor current value does not flow or a standby state where a very small current flows is assumed. Furthermore, when the pump rotation is accelerated or decelerated, the maximum motor current value that can be supplied by the motor driver may flow.
- the operation mode of the exhaust pump according to the present invention includes four operation modes, that is, ascending (Levitation), accelerating (Acceleration), steady rotation (Normal Operation), and decelerating (Brake). Will execute the process only in steady rotation mode.
- the maximum motor current continues to flow immediately after reaching the rated speed immediately after the acceleration mode.
- the maximum motor current value flows until the rated rotation speed is reached, just after acceleration. Continue (see FIG. 16).
- the motor current value is ignored for the purpose of ignoring the motor current value in the steady rotation mode immediately after the end of the acceleration mode (including the re-acceleration after the rotation speed is reduced by the pump load). Once the value is confirmed to be sufficiently small, the subsequent motor current value is adopted for monitoring.
- the timing for starting the adoption of the motor current value monitored in the steady rotation mode is based on the relationship between the accumulation of product and the change in the motor current of the exhaust pump. It is desirable to be at least 1/2 or less.
- the set value of the motor current value serving as a reference for valid data is X (A), and only when the motor current value larger than this set value X (A) flows, the motor current Store the value.
- an average value per short time is calculated for each process, and these average values are sequentially stored.
- the interval for storing the average value is sufficient, for example, once or twice a day, but is not limited thereto.
- a plurality of stored average values are plotted in time series, and a first-order approximate line of the plotted average values is obtained.
- a first-order approximation line dependent variable is time
- the difference value of the motor current value at a certain time is calculated and predicted.
- the time when the calculated difference value of the motor current value exceeds a threshold value set separately depending on the product accumulation state is determined, and the determined time is determined as the maintenance time of the exhaust pump.
- the above-mentioned primary approximation line (primary approximation formula) is obtained in principle by, for example, the least square method, but software for calculating a known primary approximation formula (function use, analysis tool use, graph creation function use, etc.) Can be used.
- FIG. 4 is a functional block diagram showing an embodiment example in which the deposit detection device according to the present invention is incorporated in the pump control device of the exhaust pump P of FIG.
- the pump control device 50 shown in FIG. 4 includes a microcomputer unit 51 that controls the exhaust pump P, a motor driver 52 that drives the motor M of the exhaust pump P, and a customer process device (based on a command from the microcomputer unit 51).
- a communication unit 53 that communicates with an external device such as a customer device including a not-shown device, a display unit 54 that displays an operation status of the exhaust pump P based on a command from the microcomputer unit 51, and a microcomputer.
- the motor driver 52 has a function as a motor current value detecting means for detecting the current value of the motor M.
- the microcomputer unit 51 includes an operation mode determination unit 100, a current value read processing unit 101, a set value comparison unit 102, a current value storage unit 103, an average value calculation unit 104, and an average value storage unit 105.
- the operation mode determination unit 100 determines whether or not the operation mode of the exhaust pump P is the rated rotation mode (except for a predetermined period immediately after the end of the acceleration mode).
- the current value reading processing unit 101 reads a motor current value for rotationally driving the rotating body R in the rated rotation mode.
- the set value comparison unit 102 compares the motor current value with the set value X (A) and determines whether or not the motor current value is equal to or greater than the set value (A). Furthermore, the current value storage unit 103 stores only data of the motor current value that is equal to or greater than the set value (A).
- the average value calculation unit 104 calculates an average value per unit time for a motor current value larger than the set value (A).
- the average value storage unit 105 stores an average value calculated for each unit time.
- the current value storage unit 103 and the average value storage unit 105 secure a part of a non-illustrated nonvolatile storage medium built in the microcomputer unit 51 as a storage area, and store a motor current value or the like in the storage area.
- a method for storing data and other methods can be employed.
- the microcomputer unit 51 includes an approximate line calculation unit 106, a predicted current value calculation unit 107, and a difference value calculation unit 108.
- the approximate line calculation unit 106 arranges a plurality of average values of the motor current values in time series, and obtains a primary approximate line for these average values.
- the predicted current value calculation unit 107 calculates a motor current value (predicted current value) using a primary approximation line. Further, the difference value calculation unit 108 starts the use of the calculated predicted current value and the exhaust pump P (when a process is executed immediately after an end user who actually uses the exhaust pump incorporates the exhaust pump into the process execution device). The difference value from the motor current value (initial motor current value) is obtained.
- 5 denotes an initial current value storage unit that stores an initial motor current value.
- the microcomputer unit 51 includes a maintenance time determination unit 109.
- the maintenance time determination unit 109 obtains a time point when the difference value exceeds a preset threshold value (set value) S, and determines the obtained time point.
- the maintenance time of the exhaust pump P is determined.
- the product deposition speed may be different for each exhaust pump P. Therefore, the product deposition of each exhaust pump P is considered to be different. It shall be set individually after confirming the situation.
- the first method is a method of directly setting the difference S from the initial current value, and the maintenance time is determined using the above comparison process.
- the second method is a method of setting a current value to be determined as the maintenance time. In this method, the maintenance time is determined by directly comparing with the predicted current value.
- step S101 the operation mode determination unit 100 determines whether or not the operation mode of the exhaust pump P is the rated rotation mode (except for a predetermined period immediately after the end of the acceleration mode). As a result, only in the rated rotation mode, the motor current value for rotationally driving the rotating body R is read by the current value reading unit 101 in step S102.
- the current value is once substantially zero at the time when the current value of the motor M is stabilized, that is, in the steady rotation mode and immediately after the end of the acceleration mode (including the re-acceleration immediately after the brake mode). After confirming the time, the following processing is performed based on the read motor current value.
- step S103 the set value comparison unit 102 compares the read motor current value with the set value X (A), and determines whether or not the motor current value is equal to or greater than the set value X (A). .
- the motor current value is equal to or greater than the set value X (A)
- the motor value value equal to or greater than the set value X (A) is sequentially stored by the current value storage unit 103 in step S104.
- the motor current value detected by the motor driver 52 is read into the buffer, and only valid data equal to or greater than the set value X (A) is picked up from the read motor current value and stored in the storage area.
- step S105 the average value calculation unit 104 calculates an average value per unit time based on the motor current value equal to or greater than the set value X (A).
- step S ⁇ b> 106 the calculated average value is sequentially stored in the average value storage unit 105.
- step S107 the plurality of average values of the motor current values are arranged in time series by the approximate line calculation unit 106, and a primary approximate line is obtained based on these average values.
- step S108 the estimated current value calculation unit 107 calculates a predicted motor current value using the obtained primary approximation line.
- step S109 the difference value calculation unit 108 obtains a difference value between the calculated predicted current value and the motor current value (initial motor current value) at the start of use of the exhaust pump P.
- step S110 the maintenance time determination unit 109 compares the obtained difference value with a predetermined threshold value S, that is, a value S set according to the product deposition state. Then, the time point at which the difference value exceeds the threshold value S is obtained, and the obtained time point is determined as the maintenance time of the exhaust pump P and is estimated.
- a predetermined threshold value S that is, a value S set according to the product deposition state.
- the estimated maintenance time can be output from the communication means 53 to an external device, or displayed on the display means 54.
- the motor current when considering the motor current at the time of acceleration and deceleration, the motor current is set as shown in FIG. Compared to the case where no consideration is given, the primary approximation line is shifted slightly upward.
- the set value of the motor current value is changed from the size X (A) to the size X-1 (A)
- the data contributing to the calculation of the average value increases as shown in FIG. 7-B.
- the primary approximation line is shifted slightly downward.
- the threshold value of the difference value of the motor current value is determined separately in consideration of the accumulation state of the product of each exhaust pump. Therefore, even when the product deposition speed differs for each exhaust pump, whether or not the difference value of the motor current value exceeds the value based on the threshold value (setting value) corresponding to the deposition speed or the like. To be judged. Therefore, the maintenance time of the exhaust pump can be determined more accurately.
- a primary approximation line is obtained with respect to an average value of motor current values equal to or greater than a set value, and a current value calculated based on the primary approximation line, a motor current value at the start of use of the exhaust pump, and The difference value of is obtained. And the time when this difference value exceeds the set value is set as the maintenance time of the exhaust pump.
- the maintenance time can be easily determined simply by obtaining a primary approximation line based on an average value of motor current values equal to or greater than a set value.
- the maximum motor current value flowing in the motor driver during pump operation standby, acceleration and deceleration can be ignored. That is, the maximum motor current value that flows through the motor driver during standby, acceleration, and deceleration can be ignored.
- the influence can be minimized.
- the difference value of the motor current can be calculated according to the deposition characteristics unique to each exhaust pump.
- the magnetic bearing of the turbo molecular pump is not limited to the 5-axis control configuration, but can be a 3-axis control configuration.
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- General Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Non-Positive Displacement Air Blowers (AREA)
Abstract
Description
(1)運転待機時等にモータ電流値が所定値を上回らない場合には、当該モータ電流値を用いて平均値を算出しない。このため、運転待機時等で、有効なデータとなるモータ電流値が極端に少ない状況下でも、前記平均値の算出に際しその影響を受けない。即ち、前記全電流平均方法に対する改善効果が得られる。
(2)通常プロセス時以外には流れないような大きなモータ電流値が流れた場合にも、その影響を最小にすることが可能になる。即ち、前記ピーク電流値記憶方法に対する改善効果が得られる。
(3)上記有効なモータ電流値の基準値は、図10で示した生成物の堆積状況の影響を受け易い大きさのモータ電流値以上に設定する。これにより、生成物の堆積状況によるモータ電流値の変化の大きな条件下で、モータ電流のデータを有意に比較することができる。
(4)平均値を算出するアルゴリズムが簡単であり、エンドユーザの負担も従来例に比し大幅に軽減する。
ここで、本発明に係る排気ポンプの動作モードには、浮上時(Levitation)、加速時(Acceleration)、定常回転時(Normal Operation)、減速時(Brake)の4つの動作モードがあり、エンドユーザがプロセスを実行するのは、定常回転モードの時だけである。
そして、記憶されたモータ電流値に基づき、短時間当たりの平均値を1プロセスごとに計算していき、これら平均値を逐次記憶していく。平均値を記憶する間隔は、例えば1日に1回~2回程度で十分であるが、之に限定されるものではない。
M モータ
R 回転体
1 円筒部
2 ブレード部
3 ロータ軸
4 排気ポンプの吸気口
5 ネジ溝部
6 排気ポンプの排気口
50 ポンプ制御装置
51 マイクロコンピュータ部
52 モータドライバ(モータ電流値検出手段)
100 動作モード判断部
101 電流値読込部
102 設定値比較部
103 電流値記憶部
104 平均値計算部
105 平均値記憶部
106 近似線算出部
107 予測電流値算出部
108 差分値算出部
109 メンテナンス時期判定部
110 初期電流値記憶部
Claims (5)
- 回転体の回転動作によりガスを排気する排気ポンプの堆積物検知装置であって、
前記回転体を回転駆動するモータのモータ電流値を検出する手段と、
定常回転モード時において、前記モータ電流値のうち設定値以上の前記モータ電流値のみを記憶する電流値記憶部と、
該電流値記憶部で記憶された前記モータ電流値の単位時間当たりの平均値を計算する平均値計算部と、
該平均値計算部で計算された前記平均値を記憶する平均値記憶部とを有し、
更に、該平均値記憶部で記憶された記憶電流平均値を時系列に並べて、該記憶電流平均値について一次近似線を求める近似線算出部と、
該一次近似線を用いて算出された予測モータ電流値と前記排気ポンプの使用開始時の初期モータ電流値との差分値を求める差分値算出部とを有し、
前記差分値が予め設定された閾値を超える時点を、前記排気ポンプのメンテナンス時期と判定するように構成したことを特徴とする排気ポンプの堆積物検知装置。 - 前記定常回転モードで検出される前記モータ電流値は、前記排気ポンプの加速モード終了後から前記モータ電流値が一旦、十分小さな値になるまでの期間は除いて検出されていることを特徴とする請求項1に記載の排気ポンプの堆積物検知装置。
- 前記モータ電流値の前記設定値は、前記ガスを排気する各プロセスにおいて、前記モータ電流値の最大値(ピーク電流値)を含むデータを少なくとも1つを取得できる範囲で、できるだけ大きな値であることを特徴とする請求項1または請求項2に記載の排気ポンプの堆積物検知装置。
- 前記モータ電流値の前記設定値は、前記排気ポンプの生成物の堆積状況に応じて決定されることを特徴とする請求項1から請求項3のいずれかに記載の排気ポンプの堆積物検知装置。
- 請求項1から請求項4のいずれかに記載の排気ポンプの堆積物検知装置を備えたことを特徴とする排気ポンプ。
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CN201380020758.5A CN104246231B (zh) | 2012-04-24 | 2013-03-07 | 排气泵的堆积物感测装置以及排气泵 |
EP13781301.0A EP2843237B1 (en) | 2012-04-24 | 2013-03-07 | Deposit detection device for exhaust pump, and exhaust pump |
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JP6058642B2 (ja) | 2017-01-11 |
EP2843237A1 (en) | 2015-03-04 |
CN104246231A (zh) | 2014-12-24 |
TWI618860B (zh) | 2018-03-21 |
EP2843237A4 (en) | 2015-12-23 |
US20150114101A1 (en) | 2015-04-30 |
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