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A Method for Detecting the Running State of a DC Water Pump

A technology of running state, direct current water pump, applied in the field of detection, can solve the problems such as the working flow of the pump cannot meet customer requirements, the impeller of the pump is easy to wear, and it is difficult to distinguish between idling and light load.

Active Publication Date: 2019-05-10
东莞市深鹏电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the water pump is running dry, the impeller of the water pump is very easy to wear, causing the working flow of the water pump to fail to meet customer requirements. Therefore, a method that can accurately detect the running state of the water pump is needed
[0003] The traditional method judges by the effective current range value of the bus set at the minimum operating speed. The disadvantage is that it is difficult to distinguish between idling and light load conditions, which is easy to cause misjudgment, and it is more likely to cause misjudgment as the input power voltage changes.

Method used

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  • A Method for Detecting the Running State of a DC Water Pump
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  • A Method for Detecting the Running State of a DC Water Pump

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[0012] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0013] The present invention is a method for detecting the running state of a DC water pump, such as figure 1 shown, including the following steps:

[0014] 1. Measure the two-phase stator current I a and I b , and get the component I under the α-β axis system by Clarke transformation α and I β ;

[0015] 2. After the α-β two-phase stationary coordinate system is transformed by Park, the d-q axis rotating coordinate system is obtained, and the corresponding component I in this coordinate system is obtained d and I q ;

[0016] 3. The torque equation of PMSM in the d-q axis rotating coordina...

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Abstract

The invention belongs to the technical field of detection, in particular to a method for detecting the running state of a direct current water pump. The method for detecting the running state of the direct current water pump includes the steps that (1) a motor of the water pump starts to run, a system collects two-phase stator currents Ia and Ib of the motor, and the Ia and Ib are processed by Clarke conversion to obtain components I alpha and I beta in an alpha-beta axis system; (2) an alpha-beta two-phase static coordinate system is processed by Park conversion to obtain a d-q axis rotating coordinate system and corresponding components Id and Iq under the coordinate system; (3) after estimation is conducted by a flux observer, the current motor rotation speed n of the water pump is obtained; (4) a specific parameter showed in the description is compared with a set tolerance value sigma, and when it is recognized that the water pump is in an idling condition, the motor stops running. The method for detecting the running state of the direct current water pump has the advantages that through a relationship between the motor rotation speed n and the q axis current Iq, the idling running condition of the direct current water pump can be precisely judged, and the water pump can be switched off timely.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for detecting the running state of a DC water pump. technical background [0002] Due to the characteristics of high power density, high efficiency, small size and simple structure, the DC water pump adopts the position sensorless control scheme, which omits the complicated process of sensor installation and has higher reliability, making it more and more popular. more widely used. However, when the water pump is running dry, the impeller of the water pump is very easy to wear, causing the working flow of the water pump to fail to meet the customer's requirements. Therefore, a method that can accurately detect the running state of the water pump is needed. [0003] The traditional method judges by the effective current range value of the bus set at the minimum operating speed. The disadvantage is that it is difficult to distinguish idling and light load co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D15/00
CPCF04D15/0088
Inventor 李金强孙家广
Owner 东莞市深鹏电子有限公司
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