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Motor stator flux linkage estimating method

A technology for flux linkage estimation and motor stator, applied in the field of flux linkage estimation

Inactive Publication Date: 2012-11-14
WUXI ECOVI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cut-off frequency of the low-pass filter is not variable, it is not easy to achieve the best balance between the starting of the motor, low-speed dynamic performance and DC drift

Method used

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  • Motor stator flux linkage estimating method

Examples

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Effect test

Embodiment 1

[0034] Embodiment 1. A method for estimating stator flux linkage of a motor, the operation steps of which are: Compensating the phase and amplitude of the calculated stator back EMF, and converting the compensated stator back EMF into stator flux linkage through a low-pass filter , wherein: a step of determining the cutoff frequency of the low-pass filter is also included, specifically, the angular frequency of the stator flux linkage is obtained by calculating the stator flux linkage, and then the cutoff frequency of the low-pass filter is determined according to the angular frequency of the stator flux linkage.

Embodiment 2

[0035] Embodiment 2, a motor stator flux linkage estimation method, wherein: the step of determining the cut-off frequency of the low-pass filter according to the stator flux angular frequency is: when the stator flux angular frequency is less than When , the cut-off frequency of the low-pass filter is set at the lower limit amplitude A; when the stator flux linkage angle frequency is at with When between, the cutoff frequency of the low-pass filter is proportional to the angular frequency of the stator flux linkage, that is ; When the stator flux angle frequency is greater than , the cut-off frequency of the low-pass filter is set at the upper limit value B, and the rest are the same as in Embodiment 1.

Embodiment 3

[0036] Embodiment 3. A method for estimating the stator flux linkage of a motor, wherein: the lower limit amplitude value A means that the cutoff frequency of the low-pass filter is kept at a preset minimum allowable value, and the rest are the same as in Embodiment 2.

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Abstract

The invention relates to a motor stator flux linkage estimating method comprising the operation steps of: compensating phase and amplitude of stator negative electro-dynamic potential obtained through calculation; and converting the compensated stator negative electro-dynamic potential into a stator flux linkage through a low-pass filter. Furthermore, the motor stator flux linkage estimating method comprises a step of determining the cut-off frequency of the low-pass filter. The step of determining the cut-off frequency of the low-pass filter comprises the following specific steps of: obtaining a stator flux linkage angular velocity obtained through stator flux linkage, and then determining the cut-off frequency of the low-pass filter according to the size of a stator flux linkage angular frequency. By utilizing the motor stator flux linkage estimating method provided by the invention, not only can the switch-on low-speed dynamic property of a motor be ensured, but also the direct-current drifting inhibiting capability is realized, so that the good balance between the switch-on low-speed dynamic property and direct-current drifting inhibiting of the motor is achieved.

Description

technical field [0001] The invention relates to a flux linkage estimation method, in particular to a motor stator flux linkage estimation method. Background technique [0002] Both direct torque control and stator flux-oriented vector control are based on the directional control of the motor stator flux. Therefore, the estimation accuracy of the motor stator flux is very important to the above two control methods. In the prior art, there are various methods for estimating the stator flux linkage of a motor. The method of using the ideal integrator to estimate the stator flux linkage has the problem of DC drift. The DC drift problem means that the measurement error of the stator current and the DC voltage of the inverter and the inaccuracy of the stator resistance parameters will cause DC drift in the flux linkage estimation results and eventually lead to Integral saturation; and due to errors such as electronic interference, sensors or A / D conversion, the DC drift of the id...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 何志明王红兴曲严冬黄雨
Owner WUXI ECOVI TECH
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