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A measuring system and method for permanent magnet eddy current loss

A technology of eddy current loss and measurement system, which is applied in the direction of magnetic performance measurement, measuring device, and magnetic variable measurement, and can solve the problems of uneven distribution of eddy current and inability to reflect

Active Publication Date: 2020-10-27
HEBEI UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Y.Aoyama et al. (Y.Aoyama, K.Miyata and K.Ohashi, "Simulations and experiments oneddy current in Nd-Fe-B magnet," IEEE Trans.Magnetics, vol.10, pp.3790-3792, 2005.) proposed Use the thermal resistance to test the temperature rise of the permanent magnet under the condition of external excitation to calculate its loss, but the thermocouple can only reflect the thermal effect at a certain point, and the distribution of the eddy current is uneven, and the heat distribution varies with the test position. And there is a big difference
The loss calculation of permanent magnets is based on the overall average effect, and the temperature rise measurement at a certain point cannot reflect the overall effect. In addition, the results of the temperature rise test will vary with the test environment, and there will be large errors

Method used

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  • A measuring system and method for permanent magnet eddy current loss
  • A measuring system and method for permanent magnet eddy current loss
  • A measuring system and method for permanent magnet eddy current loss

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Embodiment 1

[0041] The number of excitation windings in the measuring system of permanent magnet eddy current loss in this embodiment is four, and the sample to be tested is a cubic NdFeB sample, and the sample size is 10*10*10mm (length*width*height). The excitation frequency is 50Hz.

[0042] Power amplifier model: BROCKHAUS PA50, the voltage signal is amplified 10 times, the input voltage peak value is -10V~+10V, and the output voltage peak value is -100V~+100V. The maximum effective value of the output current is 50A.

[0043] Digital signal processing unit model: NI USB-7856R.

[0044] Differential amplifier circuit model: STANFORD RESERCH SYSTEM MODEL SR560 magnification 10 to 50000 times, working frequency, DC to 1MHz.

[0045] Number of turns of excitation winding: 90 turns / piece.

[0046] The maximum external dimension of the magnetic core is 150*100*100mm (length*width*height), and the thickness is 25mm.

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Abstract

The invention relates to an eddy current loss measuring system and method of a permanent magnet. The system comprises a detector, a power amplifier, a differential amplification circuit and a digitalsignal processing unit; the detector comprises two U-shaped magnetic cores facing each other, excitation windings wound around magnetic poles of the U-shaped magnetic cores respectively, a magnetic core fixing support for fixing the magnetic cores, a position fixed support, a bottom support platform and a sample fixing support; the upper portion of the magnetic core fixing support is provided withgrooves which match the shapes of the magnetic cores, and the magnetic cores can be just fixed in the grooves respectively after winding of the excitation windings; the lower portion of the magneticcore fixing support is provided with a sliding groove; the sampling fixing support is fixed on the bottom support platform between the two U-shaped magnetic cores; and the excitation windings are connected in series and then connected to the digital signal processing unit via the power amplifier. Thus, the practical operation condition of the magnetic field of the motor can be simulated, the totalloss condition of the permanent magnet is reflected accurately, and the method is highly repeatable.

Description

technical field [0001] The invention relates to a novel eddy current loss detection device, in particular to a measuring system and method for the eddy current loss of a permanent magnet. Background technique [0002] At present, the research on the permanent magnet eddy current loss detection device is still in the blank stage, because the permanent magnet will demagnetize under the condition of heating, and the heating phenomenon of the permanent magnet in the permanent magnet motor is the key factor restricting the stable operation of the motor. Y.Aoyama et al. (Y.Aoyama, K.Miyata and K.Ohashi, "Simulations and experiments oneddy current in Nd-Fe-B magnet," IEEE Trans.Magnetics, vol.10, pp.3790-3792, 2005.) proposed Use the thermal resistance to test the temperature rise of the permanent magnet under the condition of external excitation to calculate its loss, but the thermocouple can only reflect the thermal effect at a certain point, and the distribution of the eddy curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/12
CPCG01R33/1253
Inventor 李永建姜宝林张长庚于欣然岳帅超
Owner HEBEI UNIV OF TECH
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