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Position sensor-free control system and control method thereof for permanent magnet synchronous motor under low carrier ratio

A permanent magnet synchronous motor and control system technology, applied in the control system, vector control system, motor generator control and other directions, can solve problems such as operation, achieve the effect of good dynamic performance, simple and easy processing method, and satisfactory control performance

Inactive Publication Date: 2016-01-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional permanent magnet synchronous motor control system and rotor position observation system cannot operate under low carrier ratio conditions, and propose a permanent magnet synchronous motor low carrier ratio sensorless control system and its control method

Method used

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  • Position sensor-free control system and control method thereof for permanent magnet synchronous motor under low carrier ratio
  • Position sensor-free control system and control method thereof for permanent magnet synchronous motor under low carrier ratio
  • Position sensor-free control system and control method thereof for permanent magnet synchronous motor under low carrier ratio

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specific Embodiment approach 1

[0040] Specific implementation mode one: combine figure 1 and Figure 5 Describe this embodiment mode, a kind of position sensorless control system of permanent magnet synchronous motor under the condition of low carrier ratio described in this embodiment mode, it comprises No. 1 PI controller 1, complex vector PI controller 2, digital delay compensator 3, Park inverse converter 4, SVPWM frequency converter 5, Park converter 7, low carrier ratio observer 8 and phase-locked loop 9;

[0041] The three-phase rectification output terminals of the SVPWM frequency converter 5 are respectively connected with the three-phase AC input terminals of the permanent magnet synchronous motor 6; the three-phase AC input terminals of the permanent magnet synchronous motor 6 are U phase, V phase and W phase respectively ;

[0042] The No. 1 current signal input end of the Park converter 7 is connected to the U phase of the permanent magnet synchronous motor 6, the No. 2 current signal input e...

specific Embodiment approach 2

[0059] Specific embodiment 2: This embodiment is to further limit the position sensorless control system of a permanent magnet synchronous motor under the condition of low carrier ratio of specific embodiment 1. In this embodiment, the digital delay compensator 3 The compensation function is said f c o m ( ω ^ e , T s ) = s i n ( 0.5 ω ^ e T s ) 0.5 ω ^ ...

specific Embodiment approach 3

[0060] Specific implementation mode three: combination image 3 Describe this embodiment, this embodiment is to further limit the position sensorless control system of a permanent magnet synchronous motor under the condition of low carrier ratio of the specific embodiment 1, in this embodiment, the phase-locked loop 9 includes two No. PI controller 92 and No. 1 integrator 91;

[0061] The input end of the No. 2 PI controller 92 is the observed value signal input end of the phase-locked loop 9, the output end of the No. 2 PI controller 92 is the speed feedback signal output end of the Phase-locked loop 9, and the No. 2 PI controller The output terminal of the device 92 is connected with the input terminal of the No. 1 integrator 91, and the output terminal of the No. 1 integrator 91 is the output terminal of the rotor position signal of the phase-locked loop 9.

[0062] The No. 2 PI controller 92 is used to convert the observed value signal into a rotational speed feedback sig...

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Abstract

A position sensor-free control system and a control method thereof for a permanent magnet synchronous motor under a low carrier ratio relate to a position sensor-free control device for the permanent magnet synchronous motor under a low carrier ratio, and belong to the field of motor control. According to the invention, the problem that the conventional permanent magnet synchronous motor control system and position observation system cannot operate under a low carrier ratio can be solved. A digit delay compensator is adopted to improve the current loop bandwidth, and a complex vector PI controller is adopted to realize decoupling control of the current; under a synchronous rotating shaft system, a low carrier ratio observer is adopted to realize observation of counter electromotive force information; rotor positions and revolving speed observation values can be obtained by a software phase-locked loop; an SVPWA frequency converter is adopted to realize the control of the permanent magnet synchronous motor. The position sensor-free control system and the control method thereof have the advantages that a signal processing method is simple, practicable, and reliable, and the dynamic performances is good, so that position sensor-free operation of the permanent magnet synchronous motor can be realized under the low carrier ratio; the position sensor-free control system and the control method thereof are suitable for position sensor-free control of the permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to a position sensorless control device for a permanent magnet synchronous motor under the condition of low carrier ratio, belonging to the field of motor control. Background technique [0002] In recent years, the speed control system of permanent magnet synchronous motor has gradually become a research hotspot in the field of AC speed control transmission. The reason is that compared with the traditional asynchronous motor, the advantages of the permanent magnet synchronous motor are: simple structure, small size, light weight, reliable operation, high power density, good speed regulation performance, etc. It is the ideal choice for high-speed electric drive system, and its application field is very wide. According to the structure of the permanent magnet of the permanent magnet synchronous motor rotor, it can be divided into two types: surface mount type and built-in type. [0003] At present, in the application of high-perfo...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 徐殿国张国强王高林倪荣刚
Owner HARBIN INST OF TECH
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