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Method for regulating pump transport volume

A technology of pump delivery and compensation, applied in pump control, pump test, flow control, etc., can solve problems such as deviation

Inactive Publication Date: 2004-12-08
DANFOSS DRIVES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The consequence may be a significant deviation from the desired pressure

Method used

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  • Method for regulating pump transport volume
  • Method for regulating pump transport volume
  • Method for regulating pump transport volume

Examples

Experimental program
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Embodiment Construction

[0022] first according to Figures 1 to 3 To explain in detail the purpose of the invention based on the method of the present invention.

[0023] Figures 1 to 3 Curves determined empirically are plotted. according to figure 1 and 2 The curves in the figure show the delivery rate in the traditional regulation method, that is, the pressure and flow are regulated by the motor-driven pump instead of being directly measured, the pressure ( figure 1 ) and the power supplied to the motor ( figure 2 ) and time t. It is known to measure the input power P of the motor, in particular the active power and not the apparent or reactive power, as the magnitude of the actual value of the delivered quantity. For the inspection motor is related to the asynchronous motor (also known as induction motor) with a rated power of 1.5kW (kilowatt), the number of revolutions of the motor is controlled by changing its operating voltage frequency through a frequency converter.

[0024] according...

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Abstract

In a known method for regulating a delivery variable of a pump, which is driven by an electric motor operated with alternating current of variable frequency, especially via a converter, the input power of the motor is measured as the actual value for the delivery variable and is regulated by comparison with a desired value. To avoid the influence of the temperature of the motor on the delivery variable at constant input power, according to the invention upon a change in the temperature in the motor a corresponding compensating variable is taken into account in the control for the purposes of correcting the input power. As an alternative, associated values of the input power and the speed of the motor at a predetermined desired pressure value are determined empirically and stored as a table, and during operation a value of the input power belonging to a measured or approximately calculated speed of the motor is retrieved from the table as the desired value for regulating the input power.

Description

technical field [0001] The invention relates to a method for regulating the delivery rate of a pump driven by an electric motor which can be operated at a variable frequency of the alternating current, in particular by means of a frequency converter, wherein the input power of the motor is measured as the actual value of the delivery rate and passed Adjustment is made by comparing with the theoretical value. Background technique [0002] The flow or pressure of the pump may be relevant for the delivery volume, but these are not directly measured. [0003] Such methods are known from WO 98 / 04835. The electric motor driving the pump there is an induction motor (asynchronous motor), which is driven via a frequency converter in the form of a frequency converter as actuator. In order to measure the delivered quantity without a sensor, the output power or output current of the inverter or the input power or input current of the motor is measured and passed through a memory which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B49/06F04B49/20F04D15/00G05D7/06G05D16/20
CPCF04B2203/0205F04D15/0066F04B49/20F04B49/065Y10S388/934F04B2203/0209G05D16/2066F04B2205/05G05D7/0676F04B2203/0208
Inventor E·S·莫勒
Owner DANFOSS DRIVES
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