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Non-contact method for measuring temperature of pumping medium

A medium temperature, non-contact technology, applied in the application of thermometers, thermometers, measuring devices, etc., can solve the problems that the rotor magnetic flux cannot be directly measured, the accuracy of calculation is affected, and the temperature coefficient of permanent magnet materials is inconsistent, so as to achieve accurate characterization. Winding Temperature, Accurate Characterization, Facilitate Effect of Winding Temperature

Active Publication Date: 2014-06-18
新界泵业(浙江)有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing technology is to measure the fluid temperature by measuring the magnetic flux of the rotor, which has the following defects: 1. The magnetic flux of the rotor cannot be directly measured, and it is necessary to measure the voltage and current of the motor to calculate the power consumption to characterize its rate of change, the demagnetization of the armature magnetic field and The deviation of the load current will affect the accuracy of the calculation; 2. The rotor magnetic flux is affected by the remanence and coercivity of the permanent magnet material, and the temperature coefficient of the remanence of the permanent magnet material and the coercivity is inconsistent, especially for iron The temperature coefficient of the remanence of the oxygen material is negative, while the temperature coefficient of the coercive force is positive; 3. The temperature coefficient of the remanence of the permanent magnet material is generally 0.2% / ℃, so the method of measuring the magnetic flux of the rotor is only In the case of a large change in liquid temperature, the residual magnetic strength of the permanent magnet material will change significantly to cause the change of the rotor magnetic flux.

Method used

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  • Non-contact method for measuring temperature of pumping medium

Examples

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Effect test

Embodiment 1

[0014] Embodiment 1: The method for non-contact measurement of the temperature of the pumped medium, which includes step one: the rotor in the motor on the pump body is immersed in the fluid and runs; step two: when the motor is running, in the non-conductive phase Inject high-frequency current, and detect the induced potential of the non-conducting phase, detect the current, frequency and stator inductance, step 3: combine the induced potential, current, frequency and stator inductance to obtain the stator coil resistance, and then obtain the stator coil Temperature; Step 5, according to the linear relationship between the temperature of the stator coil and the temperature of the medium, the temperature of the medium is obtained. The motor is a permanent magnet motor with a controller, and the rotor of the motor is provided with a permanent magnet providing magnetic flux. Using a full bridge circuit in a controller connected in series with the motor (eg figure 1 shown) to ge...

Embodiment 2

[0035] Embodiment 2: The method for non-contact measurement of the temperature of the pumped medium also includes step 6: using a temperature sensor, immersing the motor in water and running it, measuring the resistance of the stator coil and the temperature of the stator coil at different ambient temperatures, and establishing a table, And establish temperature, stator coil resistance and stator coil temperature curves according to the table (such as figure 1 and figure 2 shown); Step 7: According to the table and graph in Step 6, combined with the linear relationship between the temperature of the stator coil and the temperature of the medium, the temperature of the medium is obtained. All the other steps 1 to 5 are the same as in Example 1.

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Abstract

The invention relates to a non-contact method for measuring the temperature of a pumping medium. The method comprises the steps of step I, immersing a rotor in a motor on the pump body in fluid and running; step II, during the operation of the motor, injecting high-frequency current in the non-breakover phase in real time, and detecting induced potential, detection current and frequency of the no-breakover phase and stator temperature; step III, obtaining the resistance of a stator coil by combining the induced potential, the current, the frequency and the stator inductance, namely the temperature of the stator coil is obtained; step V, obtaining the medium temperature according to the linear relation between the temperature of the stator coil and the medium temperature. The non-contact method for measuring the temperature of the pumping medium has the beneficial effects that the reactance change rate of a winding is detected by a high-frequency pulse current injection method, the change of liquid temperature has no influence on the inductance of a winding, the resistance change rate of the winding can be directly presented by the reactance change rate of the winding, the resistance change rate is only influenced by the winding temperature, and the influencing factor is single.

Description

technical field [0001] The invention relates to a non-contact method for measuring the temperature of a pumped medium. Background technique [0002] The existing technology is to measure the fluid temperature by measuring the magnetic flux of the rotor, which has the following defects: 1. The magnetic flux of the rotor cannot be directly measured, and it is necessary to measure the voltage and current of the motor to calculate the power consumption to characterize its rate of change, the demagnetization of the armature magnetic field and The deviation of the load current will affect the accuracy of the calculation; 2. The rotor magnetic flux is affected by the remanence and coercivity of the permanent magnet material, and the temperature coefficient of the remanence of the permanent magnet material and the coercivity is inconsistent, especially for iron The temperature coefficient of the remanence of the oxygen material is negative, while the temperature coefficient of the c...

Claims

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Application Information

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IPC IPC(8): G01K13/00
Inventor 许敏田
Owner 新界泵业(浙江)有限公司
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