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Surface-mounted permanent magnet synchronous motor sensorless segmented delay compensation strategy

A permanent magnet synchronous motor, delay compensation technology, applied in the control of generators, motor control, motor generator control and other directions, can solve the problems of position observer dynamics and stability effects, to improve position estimation accuracy, avoid The effect of phase delay

Active Publication Date: 2021-09-07
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the delay is not compensated, the dynamics and stability of the position observer will be affected by the dynamic coupling of the current regulator

Method used

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  • Surface-mounted permanent magnet synchronous motor sensorless segmented delay compensation strategy
  • Surface-mounted permanent magnet synchronous motor sensorless segmented delay compensation strategy
  • Surface-mounted permanent magnet synchronous motor sensorless segmented delay compensation strategy

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Embodiment Construction

[0065] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0066] The present invention is a surface-mounted permanent magnet synchronous motor without a position sensor segmented delay compensation strategy, which is specifically implemented according to the following steps:

[0067] Step 1: Use carrier modulation to perform PI adjustment on the predicted q-axis voltage error in the low-speed region to obtain the compensation time, and then eliminate the influence of the total system delay by compensating the on-time of the IGBT. The principle block diagram is as follows figure 1 shown; specifically:

[0068] Step 1.1, when the fundamental frequency of the motor is less than 47Hz, use the square wave voltage injection method, set the carrier frequency to 500Hz, and inject a square wave voltage signal with an amplitude of 15V and a frequency of 250Hz into the d-axis. The injection sequence is as follow...

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Abstract

The invention discloses a surface-mounted permanent magnet synchronous motor sensorless segmented delay compensation strategy, which specifically comprises the following steps of: when the fundamental frequency of a motor is less than 47Hz, carrying out PI (Proportional-Integral) regulation on a predicted q-axis voltage error by using carrier modulation, and then eliminating the influence of total time delay of a system by compensating the conduction time of an IGBT (Insulated Gate Bipolar Translator); and after the fundamental wave frequency is greater than 47Hz, along with the increase of the rotating speed, adopting a SHEPWM + square wave modulation mode, and elimiating the delay effect by predicting a voltage vector angle, modulating the depth and estimating the rotor position. The invention provides a system delay segmentation compensation strategy aiming at the sensorless driving of the surface-mounted permanent magnet synchronous motor under hybrid pulse width modulation, meanwhile, a high-frequency square wave voltage signal injection method is adopted at zero low speed, a nonsingular terminal sliding-mode observer is adopted at medium high speed, the non-singular terminal sliding-mode observer is adopted at low speed, the influence of system delay on position sensorless control can be eliminated in the full-speed domain, and the control performance is improved.

Description

technical field [0001] The invention belongs to the technical field of AC motor drive control, and in particular relates to a segmented delay compensation strategy for a surface-mounted permanent magnet synchronous motor without a position sensor. Background technique [0002] With the rapid development of high-speed rail trains, permanent magnet synchronous traction motors with wide speed regulation range, high power density and low energy consumption have become a research hotspot in the current rail transportation field. / speed sensor to get the position or speed signal of the motor. During the actual operation of the locomotive, the electromagnetic environment is complex and the vibration is severe, which can easily lead to the failure of the mechanical sensor and cause the failure of the traction system. [0003] In the field of EMU traction, the power level of the converter is relatively high, and the switching device is limited by the heat dissipation capacity. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P21/13H02P25/026H02P27/08
CPCH02P21/18H02P21/13H02P25/026H02P27/08H02P2207/05
Inventor 张航梁文睿张辉
Owner XIAN UNIV OF TECH
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