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No-time-lag observation method and device for phase current of permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and phase current, which is applied in the direction of controlling electromechanical transmission, controlling generator, motor generator control, etc., to achieve the effect of improving response characteristics and eliminating current hysteresis

Inactive Publication Date: 2018-10-26
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the feedback current calculation process, it can be seen that the current value is delayed by two control cycles from the modulus acquisition to the final pulse width modulation wave output.

Method used

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  • No-time-lag observation method and device for phase current of permanent magnet synchronous motor
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  • No-time-lag observation method and device for phase current of permanent magnet synchronous motor

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Embodiment Construction

[0055] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0056] To achieve the above object, the present invention comprises the following steps:

[0057] (1) Establish a permanent magnet synchronous motor mathematical model to obtain the d-q voltage command output equation;

[0058] (2) Perform space vector coordinate transformation on the three-phase feedback current of the permanent magnet synchronous motor to obtain the d-q axis feedback current;

[0059] (3) Establish phase current observation model of permanent magnet synchronous motor.

[0060] Described step (1), realizes by following method:

[0061] The mathematical model of permanent magnet synchronous motor is shown in formula (1):

[0062]

[0063] In the formula: U d , U q is the d-axis and q-axis stator voltage command; L d , L q is the d-axis and q-axis equivalent inductance; R s is the stator resistance; ω e is the electrical angular vel...

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Abstract

The embodiment of the invention relates to a no-time-lag observation method and device for phase current of a permanent magnet synchronous motor used for eliminating current feedback lag and delay generated by a control system in a current sampling calculation process. According to the current observation method, a current observation model is built according to a voltage control equation of the permanent magnet synchronous motor to obtain a no-time-lag current feedback signal, thereby improving the current feedback speed of the control system and improving the response capability of the control system.

Description

technical field [0001] The present invention is mainly aimed at the current non-time-lag observation method of the permanent magnet synchronous motor, and is a current observation method based on the voltage control equation of the permanent magnet synchronous motor. The method and device can effectively eliminate the current sampling and calculation delay of the permanent magnet synchronous motor To solve the problem, improve the response speed of the current loop of the control system. Background technique [0002] The drive control process of the AC servo system uses a pulse width modulator to control and generate pulse sequence waves with equal amplitudes and unequal pulse widths to drive the rotation of permanent magnet synchronous motors. The output of pulse signals is generally based on current commands, speed commands or position commands. Calculation. Direct control of the current command constitutes a current closed loop, the current feedback value is used for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 王磊任齐民张洪鑫张永德
Owner HARBIN UNIV OF SCI & TECH