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Current acquisition method at low speed segment of permanent magnet synchronous machine of compressor

A permanent magnet synchronous motor and acquisition method technology, which is applied in the direction of using digital measurement technology for measurement, can solve the problem of low current acquisition accuracy in low-speed sections, and achieve the effects of improving sampling resolution, reducing acquisition errors, and improving sampling accuracy.

Inactive Publication Date: 2010-12-08
SHANGHAI ELECTRICGROUP CORP +1
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the current acquisition accuracy of the 180-degree compressor permanent magnet synchronous motor driver is not high in the low-speed section, and provide a method that improves the A / D sampling resolution within the cost range and can reduce the collection of current signals in the low-speed section Error, method to improve sampling accuracy

Method used

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  • Current acquisition method at low speed segment of permanent magnet synchronous machine of compressor
  • Current acquisition method at low speed segment of permanent magnet synchronous machine of compressor

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Embodiment

[0019] refer to figure 1 , a current acquisition method for the low-speed section of a permanent magnet synchronous motor of a compressor, the steps of which are as follows:

[0020] 1) Use 4-way amplifier TLC2464 to amplify the current signal. The magnifications are 1, 2, 4, 8 in turn. The input terminals of the four operational amplifiers are connected in parallel, and the current signal I is connected. After the 4 channels of current signals are amplified, they are output once as 1×I, 2×I, 4×I, 8×I, see process 11.

[0021] 2) Collect the amplified current signals 1*I, 2*I, 4*I, 8*I of the 4-way amplifiers respectively with the 4-way A / D on-chip of DSP. The values ​​D1, D2, D4, and D8 of the four collected signals are obtained, see process 12.

[0022] 3) According to the magnification, the values ​​of the collected signals of each channel are shifted to the right, and fixed-point number division is performed. The number of right shifts is 0 times for D1, 1 time for D2,...

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Abstract

The invention relates to a current acquisition method for a low-speed section of a permanent magnet synchronous motor of a compressor. The method comprises the following steps: 1) amplifying a current signal; 2) acquiring the amplified current signal; 3) restoring a value of the amplified current signal; and 4) averaging various acquired signals which move to right. The adopted technical proposalcompletely solves the problem of poor current acquisition precision of a 180-degree compressor permanent magnet synchronous motor driver at the low-speed section, can improve an A / D sampling resolution in a cost range and reduce acquisition errors of the current signals at the low-speed section, thus improving the acquisition precision.

Description

technical field [0001] The invention relates to a current collection method for a permanent magnet synchronous motor of a compressor, in particular to a current collection method for a low-speed section of a permanent magnet synchronous motor of a compressor. Background technique [0002] The 180-degree compressor permanent magnet synchronous motor driver cannot improve the sampling accuracy in low-speed current acquisition. The reasons are: 1) the A / D sampling resolution cannot be improved due to cost constraints; 2) the low-speed current signal itself is small, and the acquisition error larger. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the current acquisition accuracy of the 180-degree compressor permanent magnet synchronous motor driver is not high in the low-speed section, and provide a method that improves the A / D sampling resolution within the cost range and can reduce the collection of current signals in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 李曼萍黄建民王宗暐邬雁忠齐亮王振滨李劲
Owner SHANGHAI ELECTRICGROUP CORP
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