Speed sensorless control system based on SMO (Sliding Mode Observer)

A technology without speed sensor and control system, applied in control system, vector control system, control generator, etc., can solve problems such as large amount of calculation, slow system dynamic characteristics, system instability, etc.

Inactive Publication Date: 2016-12-07
SHANGHAI INST OF TECH
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  • Abstract
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Problems solved by technology

[0005] In order to overcome the existing speed sensor-based permanent magnet synchronous motor's rotor angle and rotational speed estimation method, the principle is complicated, the calculation amount is large, and the slow dynamic characteristics make the dynamic characteristics of the whole system decrease, and even lead to the instability of the system. Now In particular, a SMO-based speed sensorless control system with high dynamic performance and easy engineering implementation is proposed

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  • Speed sensorless control system based on SMO (Sliding Mode Observer)
  • Speed sensorless control system based on SMO (Sliding Mode Observer)
  • Speed sensorless control system based on SMO (Sliding Mode Observer)

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Embodiment Construction

[0112] The technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all examples. Based on the present invention All other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0113] see figure 1 , now consider the general situation in the patent of the present invention, there is a switching surface s(x)=s(x 1 ,x 2 ,···,x n )=0, it will x=f(x)(x∈R n ) The state space of this system is divided into upper and lower parts s>0 and sfigure 1 As shown, there are three cases of moving points on the switching surface. Point A is a common point, and when it reaches near the switching surface s=0, the moving point passes through point A; Point B is the starti...

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Abstract

The invention discloses a speed sensorless control system based on an SMO (Sliding Mode Observer). The speed sensorless control system comprises an inverter unit, a PMSM unit, a first Clark conversion unit, a Park conversion unit, a second Clark conversion unit, a sliding mode observer unit, a first comparer unit, a first PI regulating unit, a second comparer unit, a second PI regulating unit, a third comparer unit, a third PI regulating unit, a Park inversion conversion unit and a SVPMW unit. The rotor position and rotor speed of a motor are detected through the sliding mode observer easy for engineering realization, a relation of sliding mode gain and estimated counter electromotive force is established to reduce system buffeting; and the sliding mode observer in the system can track the rotation speed and rotation angle change of the motor timely and accurately under the conditions of rotation speed sudden change and load sudden change. The speed sensorless control system has the characteristics of high control accuracy, good dynamic performance and high robustness; and moreover, the speed sensorless control system also has the advantages of low cost, simple control algorithm, high rotation speed and position estimation speed, high estimation accuracy and the like.

Description

technical field [0001] The invention relates to the technical field of speed sensorless speed measurement, in particular to an SMO-based speed sensorless control system. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the advantages of high power density, high energy conversion efficiency, wide speed range, small size, light weight, etc., and has been widely used in industrial, civil, military and other fields. [0003] The control of the permanent magnet synchronous motor needs to obtain the position and speed information of the motor rotor. At present, the commonly used position sensors include photoelectric encoders, resolvers and other devices. The use of these devices not only increases the size and cost of the system, but also reduces the system cost. It also limits the application of permanent magnet synchronous motors in special environments. In order to solve many defects caused by mechanical sensors, the research of sensorless control te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/18H02P21/24H02P25/03
CPCH02P21/13H02P25/03
Inventor 张海刚张磊叶银忠徐兵王步来万衡华容卢建宁
Owner SHANGHAI INST OF TECH
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