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Sensorless intermittent automatic quantitative fluid adding method

A sensor, intermittent technology, applied in the direction of machine/engine, control of electromechanical transmission, motor control, etc., can solve problems such as inability to meet process requirements

Active Publication Date: 2020-01-03
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this manual start and stop method cannot meet the technological requirements of intermittent automatic and precise quantitative dosing in the modern production process

Method used

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  • Sensorless intermittent automatic quantitative fluid adding method
  • Sensorless intermittent automatic quantitative fluid adding method
  • Sensorless intermittent automatic quantitative fluid adding method

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Experimental program
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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention is made further.

[0038] First, briefly introduce the principle of vector control. Such as figure 2 as shown, i a ,i b ,i c is the three-phase stator current under the three-axis coordinates on the stator plane, since i a + i b + i c =0, usually only two phases are measured. i α ,i β is the current under the two-axis coordinates on the stator plane after Clark transformation. i d ,i q is the current under the two-axis coordinates on the rotor plane after PARK transformation. V d ,V q is the voltage vector under the two-axis coordinates on the rotor plane obtained by the PI control algorithm. V α ,V β is the voltage vector under the two-axis coordinates on the stator plane after inverse PARK transformation. θ, ω are the counter electromotive force generated according to the rotor current respectively, using i α ,i β , V α ,V β The specific process of the motor rotor angle and an...

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Abstract

The invention discloses a sensorless intermittent automatic quantitative fluid adding method in view of the intermittent automatic fluid adding requirements in the fields of petroleum, chemical engineering, water treatment, food, pharmacy, environmental protection and the like. The method comprises the following steps: estimating a rotor rotation angle theta and an angular speed omega of a drivingmotor based on sensorless vector control; carrying out calibration in two stages on the basis, and determining the volume Vr1 and Vr2 parameters of the driving motor in each turn; and determining a required motor turn number NQ according to the quantitative adding volume VQ. Thus, sensorless intermittent automatic quantitative adding of fluid is realized.

Description

technical field [0001] The invention relates to a technique for intermittent automatic quantitative dosing of fluid, in particular to a method for intermittent quantitative dosing of fluid under the condition of no sensor. Background technique [0002] Intermittent quantitative dosing of fluids is common in petroleum, chemical, water treatment, food, pharmaceutical, environmental protection, liquid fertilization and other fields. Since the fluid to be added is generally corrosive acid and alkali, the low-level equipment to realize this process is usually a reciprocating diaphragm metering pump, which is usually driven by a three-phase asynchronous motor to reduce costs. Such as figure 1 As shown, the rotating shaft of the driving motor (three-phase asynchronous motor) 1 is decelerated and reversed through the reduction mechanism composed of the worm 2 and the worm gear 3. The worm gear 3 drives the crank 4 to rotate synchronously, and the crank 4 drives the diaphragm 6 to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/24F04B43/04F04B49/06F04B13/00F04B15/04
CPCF04B13/00F04B15/04F04B43/0081F04B43/04F04B49/065H02P2203/09H02P21/18H02P21/24Y02P20/10
Inventor 余世明何德峰仇翔宋秀兰
Owner ZHEJIANG UNIV OF TECH