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Segmented variable-coefficient iron loss model for fine analysis of loss of alternating-current motor

An AC motor, refined technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as errors

Active Publication Date: 2015-12-30
SIEMENS STANDARD MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve this problem, it is an effective method to study the variable coefficient iron loss model in which the loss coefficient changes with the magnetic density and frequency, but because the traditional variable coefficient models all express the loss coefficient as a polynomial of frequency and magnetic density , is affected by the ill-conditioned characteristics of polynomial fitting, so when the frequency and amplitude span are large, it will also cause a large error

Method used

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  • Segmented variable-coefficient iron loss model for fine analysis of loss of alternating-current motor
  • Segmented variable-coefficient iron loss model for fine analysis of loss of alternating-current motor
  • Segmented variable-coefficient iron loss model for fine analysis of loss of alternating-current motor

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Experimental program
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Effect test

Embodiment 1

[0069] Taking silicon steel sheet DR510 and silicon steel sheet DW470 as examples, according to the model shown in formula (5), using the loss coefficients shown in formulas (6) to (11) to solve the loss coefficients, the loss coefficient solution results are as follows Figure 1-Figure 4 shown. From figure 2 and Figure 4 It can be seen that for different types of silicon steel sheets, the additional magnetic density term coefficients of eddy current loss and hysteresis loss are very different; therefore, the loss coefficients for different types of silicon steel sheets need to be solved separately. In addition, in most cases β 1 <0, that is to say, the additional magnetic density item of hysteresis loss decreases gradually, indicating that hysteresis loss decreases with the increase of saturation degree of ferromagnetic material.

Embodiment 2

[0071] Comparing the loss value calculated by the Bertotti trinomial model and the model shown in formula (5) with the measured value, the relative error results are as follows Figure 1 ~ Figure 4 As shown, it can be seen that the Bertotti trinomial constant coefficient model has a high calculation accuracy when the magnetic flux density B≤1.2T and the frequency ffigure 1 and figure 2 The error shown in can exceed 40%; And according to the calculation error of the proposed model of the present invention is generally within 5%, such as image 3 shown.

Embodiment 3

[0073] Taking silicon steel sheet DR510 as an example, compare the calculated and measured loss values ​​under different frequency and magnetic density conditions, the results are as follows Figure 5 shown. in, Figure 5 (a) is 50Hz, under different flux density conditions, the Bertotti trinomial constant coefficient model, the model of the present invention and the measured value contrast; Figure 5 (b) is 100Hz, under different flux density conditions, the Bertotti trinomial constant coefficient model, the model of the present invention and the measured value contrast; Figure 5 (c) is 400Hz, under different magnetic density conditions, the Bertotti trinomial constant coefficient model, the model of the present invention and the measured value contrast; Figure 5 (d) is 600Hz, under different magnetic density conditions, Bertotti trinomial constant coefficient model, the present invention's model and measured value contrast; Can find out, the model of the present inventio...

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Abstract

The invention discloses segmented variable-coefficient iron loss model for fine analysis of loss of an alternating-current motor and belongs to the technical field of loss calculation and analysis of the alternating-current motor. The model is shown in the specification. According to the model, loss data of silicon steel sheets are measured actually at a series of frequencies and in magnetic density and analyzed in combination of a classical binomial model, eddy-current loss increase caused by magnetic circuit saturation and magnetic hysteresis loss increase caused by harmonic magnetic fields are considered, four additional loss coefficients changing with the magnetic density and the frequencies in a segmented manner are introduced in an eddy-current item and a magnetic hysteresis loss item, and accordingly, the model is established. The main coefficients in the model change with magnetic density amplitudes and frequencies, besides, magnetic hysteresis loss and eddy-current loss caused by fundamental waves and harmonic magnetic fields can be accurately separated by means of the model, and the fine analysis of the iron loss can be realized.

Description

technical field [0001] The invention belongs to the technical field of AC motor loss analysis and calculation, and in particular relates to a segmental variable coefficient iron loss model for refined analysis of AC motor loss. Background technique [0002] In the process of developing high-efficiency motors, how to accurately calculate the iron loss and analyze it in detail is the key link to obtain the main influencing factors of iron loss and propose corresponding measures to reduce consumption. Affected by factors such as the magnetization method, the accurate calculation of the iron loss of the motor has always been a difficult problem faced by the engineering community. Therefore, it is a key and difficult problem to be solved urgently in the development of high-efficiency motors to study the accurate calculation model of iron loss that can be used for fine analysis of motor losses. [0003] At present, there are two kinds of classic calculation models of iron loss, o...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 赵海森张冬冬王莎莎刘晓芳
Owner SIEMENS STANDARD MOTORS LTD
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