Method for identifying stator resistance parameters

A technology of stator resistance and identification method, which is applied in the estimation/correction of motor parameters, electronic commutation motor control, electrical components, etc., can solve the problems of multiple storage space, reduced voltage drop, wrong results, etc., to improve adaptability , Eliminate the influence of the conduction voltage drop, the effect of strong adaptability

Active Publication Date: 2011-02-09
WISDRI WUHAN AUTOMATION
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Problems solved by technology

Since D is small, U DC ×D and U IGBT +U DIODE The difference is not big, the latter cannot be ignored, otherwise U av A large difference from the actual voltage will lead to incorrect results
However, since the selection of power devices in each power segment of the inverter is different, the voltage drop value of the latter in each power segment is also different. In addition, the continuous upgrading of power devices will reduce the voltage drop. If you want to deal with it accurately, It is necessary to establish a corresponding table in the program, which requires more storage space

Method used

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  • Method for identifying stator resistance parameters

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Embodiment Construction

[0039] Figure 4 It is a flowchart of the two-point method, which includes the following steps:

[0040] 1) Initialize the registers in the processor, and clear the identification flags.

[0041] 2) Set a current target value and tolerance range, for the DC voltage U on the bus DC Do chopping, inject stator resistance, set period T s1 , The motor adopts the star connection method, if it is a delta connection method, the same result can be obtained through the conversion between the delta and star.

[0042] 3) The processor performs 256-point sampling on the current of the stator resistance.

[0043] 4) Filter after sampling, and adjust pulse width t by proportional integral 1 , so that the current is within tolerance.

[0044] 5) Calculate the average current I 1 , due to the duty cycle Therefore, the average voltage U is calculatedav1 =U DC ×D 1 .

[0045] 6) Record the average current I 1 and the average voltage U av1 , add 1 to the identification flag bit, and ...

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Abstract

The invention provides a method for identifying stator resistance parameters, comprising the following steps: adopting the two point method on the basis of the ordinary direct current (DC) voltammetry to set two winding current target values; and injecting DC at twice and respectively recording the voltage value and current value of the DC and obtaining the stator resistance value by differentiation and integration. The voltage drop of an insulated gate bipolar translator (IGBT) and the voltage drop of a freewheel diode are cancelled out in computation, so that the identification precision is improved, dependency on devices is eliminated and the adaptability is very good.

Description

technical field [0001] The invention relates to a method for identifying stator resistance parameters. Background technique [0002] As we all know, motor parameters have a decisive impact on the performance index of vector control. How to obtain real motor parameters through identification is the key to the design of high-performance vector control inverters. These motor parameters include stator resistance, stator leakage inductance, rotor resistance, rotor leakage inductance, mutual inductance, and no-load excitation current. The identification process of these parameters is related to each other. The stator resistance is the basis of the entire motor parameter identification, and the quality of the identification result directly determines the quality of other parameter identification. [0003] At present, the conventional method for identifying stator resistance parameters is DC voltammetry. A low-voltage direct current is passed between any two-phase windings of the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P23/14
Inventor 康现伟罗志刚王国强
Owner WISDRI WUHAN AUTOMATION
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