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A segmental delay compensation strategy for surface-mounted permanent magnet synchronous motor without position sensor

A technology of permanent magnet synchronous motor and delay compensation, which is applied in the control of generators, motor control, motor generator control, etc., can solve the problems of dynamic and stability effects of position observers, improve the accuracy of position estimation, avoid The effect of phase delay

Active Publication Date: 2022-03-04
XIAN UNIV OF TECH
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  • Abstract
  • Description
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  • 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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  • A segmental delay compensation strategy for surface-mounted permanent magnet synchronous motor without position sensor
  • A segmental delay compensation strategy for surface-mounted permanent magnet synchronous motor without position sensor
  • A segmental delay compensation strategy for surface-mounted permanent magnet synchronous motor without position sensor

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Embodiment Construction

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

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

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

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

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Abstract

The invention discloses a segmental delay compensation strategy for a surface-mounted permanent magnet synchronous motor without a position sensor, specifically: when the fundamental wave frequency of the motor is less than 47 Hz, use carrier modulation to perform PI adjustment on the predicted q-axis voltage error, and then pass Compensate the IGBT conduction time to eliminate the influence of the total system delay; when the fundamental frequency is greater than 47Hz, as the speed increases, the SHEPWM+square wave modulation method is used to predict the voltage vector angle, modulation depth and estimate the rotor position. Eliminates time-lapse effects. The present invention proposes a system delay segmental compensation strategy for the drive of surface-mounted permanent magnet synchronous motors without position sensors under hybrid pulse width modulation. The non-singular terminal sliding mode observer can eliminate the influence of system delay on the position sensorless control in the full speed range, and improve the control performance.

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 Patents(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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